WO2005122568A1

WO2005122568A1 - Data processing device and data processing method

Info

Publication number: WO2005122568A1
Application number: PCT/JP2005/010714
Authority: WO
Inventors: Tomohiko Sakatani; Osamu Okauchi
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-06-11
Filing date: 2005-06-10
Publication date: 2005-12-22
Also published as: JP2007266651A

Abstract

There is provided a technique for recording a content on a recording medium in a format realizing high-speed dubbing and dubbing the recorded content on another recording medium at a high speed. A data processing device writes a content data stream onto a first recording medium, which is used for dubbing the content onto a second recording medium. It is possible to write a first data stream and a second data stream having different formats onto the first recording medium. Onto the second recording medium, the second data stream can be written. The data processing device includes: a reception unit for receiving the type information identifying the type of the second recording medium as a content dubbing object; and a recording control unit for acquiring the second data stream according to the type information and writing it onto the first recording medium.

Description

Specification

Data processing device and data processing method

Technical field

The present invention relates to a technique for digitally recording a broadcast program or the like on a predetermined recording medium and dubbing the recording on another recording medium.

Background art

[0002] In recent years, an optical disk recorder incorporating a hard disk drive (hereinafter, referred to as "HDD" in this specification) has been remarkably popularized. Such a recorder is generally capable of dubbing a broadcast program recorded on an HDD or recorded on a recordable optical disc between the HDD and the optical disc.

[0003] Consider an HDD built-in DVD recorder that uses a recordable DVD (DVD-RAM, DVD-R, etc.) as an optical disc. As for the dubbing function between the HDD and the DVD in the recorder, the high-speed duplication is a major element of the product discrimination to enhance the convenience of the user! The first approach to realizing high-speed dubbing is to improve the stream transfer rate between the HDD and DVD. Second, it is conceivable to eliminate various stream conversion processes during dubbing. Regarding the latter, Patent Document 1, for example, discloses a method of directly copying compressed AV data without performing data compression or data decompression.

[0004] Even in a DVD recorder with a built-in HDD, the recording format of the AV source is set to the MPEG2 program stream (hereinafter referred to as MPEG2-PS), which is the recording format of the DVD media, and this stream is directly transferred to the DVD media. This realizes high-speed dubbing.

[0005] On the other hand, digital broadcasting has recently become popular in Japan. The stream format of the program source (AV source) transmitted by digital broadcasting is an MPEG2 transport stream (hereinafter referred to as MPEG2-TS). In order to enable such AV source streams to be recorded directly in their original format, they are attracting attention as next-generation large-capacity disc media, and are recordable Blu-ray Discs (BDs). Then, M PEG2-TS is adopted as a recording format. In Japan, terrestrial analog broadcasting is scheduled to be discontinued in 2011, after which all domestic TV broadcasting will be consolidated into digital broadcasting. In other words, until then, terrestrial analog broadcasting and digital broadcasting are mixed.

[0006] Today, analog broadcasting and digital broadcasting are mixed as broadcasting infrastructure, and DVD and BD are mixed as disc media. In view of the user's merits, recording equipment that supports recording and playback of both broadcasting sources and recording media is provided. There is a need to. In other words, even if the ratio of digital broadcasting and BD increases, dubbing of already recorded DVD media and, for example, running costs are advantageous and playback compatibility is high! Deemed necessary.

[0007] For this reason, as a recording method for the built-in HDD, the following mechanism can be easily considered in consideration of high-quality recording of digital broadcasting and compatibility with conventional DVD media. In other words, for digital broadcasting, MPEG2—TS is recorded directly to give priority to image quality, and for analog broadcasting, MPEG2—PS is used as usual to ensure compatibility, including high-speed dubbing with conventional DVD media. It can be easily considered that the operation for encoding and recording the data to the computer is performed.

Patent document 1: Japanese Patent Application Laid-Open No. 6-338132

Disclosure of the invention

Problems to be solved by the invention

[0008] However, due to the existence of recording media having different recording stream formats, a conventional recorder may not be able to perform high-speed dubbing requested by a user.

[0009] Specifically, when dubbing an analog broadcast program recorded on a HDD in MPEG2-PS to a BD, the data is not converted from a stream format from MPEG2-PS to MPEG2-TS. Must be transferred and recorded. Similarly, when dubbing a digital broadcast program recorded on a HDD in MPEG2-TS format to a DVD, it is necessary to transfer and record the data while converting the stream format to MPEG2-TS power MPE G2-PS. is there.

[0010] Since the data packet structures of MPEG2-PS and MPEG2-TS are different from each other, an expensive hardware for reconstructing packet data at high speed is required to perform such conversion processing. Hardware is required. For example, it is necessary to provide a dedicated conversion processing circuit or a general-purpose CPU with extremely high processing capacity. For this reason, if hardware capable of high-speed conversion of the stream format is not implemented, the high-speed dubbing function requested by the user may not be provided.

[0011] In particular, since the data transfer rate of digital broadcast MPEG2-TS exceeds the maximum data transfer rate of DVD media, digital broadcast sources recorded directly on HDD with MPEG2-TS are dubbed to DVD media. However, even if high-speed stream format conversion is performed, dubbing cannot be performed normally unless the transfer rate is also converted.

An object of the present invention is to record content on a recording medium in a format for realizing high-speed dubbing, and to dub the recorded content to another recording medium.

Means for solving the problem

[0013] The data processing device according to the present invention is used for writing a data stream of content to a first recording medium and dubbing the content to a second recording medium. A first data stream and a second data stream having different formats can be written on the first recording medium. The second data stream can be written on the second recording medium. The data processing device includes: a receiving unit that receives type information specifying a type of the second recording medium as a dubbing target of the content; and acquiring the second data stream based on the type information; And a recording control unit for writing to one recording medium.

[0014] The content may be an analog broadcast program, and the content may further include an encoder that generates the second data stream based on an analog signal related to the analog broadcast program.

[0015] The content may be a digital broadcast program, and the recording control unit may acquire the second data stream based on a digital signal related to the digital broadcast program.

[0016] The data processing device acquires the first data stream including encoded data from a digital signal related to the digital broadcast program, decodes the encoded data, and decodes the data. And a decoder that outputs digital data, and an encoder that encodes the digital data to generate the second data stream.

[0017] A maximum value of the data transfer rate is defined for the second recording medium. The encoder may generate the second stream having a data rate equal to or less than the maximum value.

[0018] The first recording medium may be a hard disk, and the second recording medium may be an optical disk.

[0019] The second recording medium may be a recordable DVD, and the recording control unit may write an MPEG2 program stream as the second data stream on the first recording medium.

[0020] The second recording medium may be a recordable Blu-ray disc, and the recording control unit may write an MPEG2 transport stream as the second data stream on the first recording medium.

[0021] The data processing device detects a type of the loaded recording medium and outputs a detection result, and based on the detection result, data that can be written to the loaded recording medium. The system may further include a system control unit that specifies a stream format and writes a data stream in the specified format to the loaded recording medium. The instruction unit receives an instruction to start dubbing the content. In response to the instruction to start dubbing, the detection unit outputs a detection result indicating the loading of the second recording medium. The recording control unit reads the second data stream from the first recording medium. The system control unit may determine that the format of the second data stream matches a format that can be written to the second recording medium, and may write the second data stream to the second recording medium.

[0022] The method according to the invention is used for writing a data stream of content on a first recording medium and dubbing said content on a second recording medium. A first data stream and a second data stream having different formats can be written on the first recording medium, and the second data stream can be written on the second recording medium. Receiving the type information specifying the type of the second recording medium as a dubbing target of the content, and obtaining the second data stream based on the type information based on the type information; Write the second data stream to the first recording medium Steps.

[0023] The method may include, in response to an instruction to start dubbing the content, outputting a detection result indicating a type of a recording medium that is loaded !, wherein the detection result indicates that the second recording medium is And writing the second data stream read from the first recording medium in the obtaining step to the loaded second recording medium. Good.

The invention's effect

[0024] The data recording device of the present invention allows the user to select and set the recording stream format according to the application at the time of recording the broadcast program, so that the dubbing intended by the user can be executed at high speed.

[0025] In addition, stream characteristics such as a stream format and a transfer rate are automatically converted when dubbing is performed, so that dubbing can be performed with easier operations.

Brief Description of Drawings

FIG. 1 is a diagram showing a configuration of a system formed by an optical disk recorder with a built-in HDD 100 according to an embodiment of the present invention and other devices.

FIG. 2 is a diagram showing a data structure of a transport stream (TS) 20.

FIG. 3 (a) is a diagram showing a data structure of a video TS packet 30, and FIG. 3 (b) is a diagram showing a data structure of an audio TS packet 31.

[FIG. 4] (a) to (d) are diagrams showing the relationship between streams constructed when a video picture is reproduced from a video TS packet.

FIG. 5 is a diagram showing a data structure of an MPEG2 program stream 50 conforming to the DVD video recording standard.

FIG. 6 is a diagram showing a data structure of a video pack in a program stream 50.

FIG. 7 is a diagram showing a configuration of a functional block of the recorder 100.

FIG. 8 is a diagram schematically showing a transfer path of a program data stream used during recording.

FIG. 9 is a flowchart showing a procedure of a recording process according to the embodiment of the present invention.

FIG. 10 is a diagram schematically showing a transfer path of a program data stream used during dubbing; It is.

FIG. 11 is an explanation of a flow code indicating a procedure of a dubbing process according to an embodiment of the present invention.

100 HDD built-in optical disk recorder

106 TV

108 PC

112 memory card

114 BD

201a digital tuner

201b analog tuner

202 AD converter

203 MPEG-2 encoder

204 Disk controller

205a Optical disk (BDZDVD—RAM)

205b HDD

206 MPEG-2 decoder

207 Graphic control unit

208 memory

209 DA converter

210 Program ROM

211 CPU

212 RAM

213 CPU bus

214 Network controller

215 Instruction receiver

216 Interface (IZF)

217 Memory card controller

250 System control unit BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a content recording device according to the present invention will be described with reference to the accompanying drawings. In the embodiment, it is assumed that the content is a program of analog broadcast and Z or digital broadcast, and the data processing device is an optical disk recorder with a built-in HDD.

FIG. 1 shows the configuration of a system formed by the optical disk recorder 100 with a built-in HDD and other devices according to the present embodiment. The HDD built-in optical disk recorder 100 (hereinafter referred to as “recorder 100”) is a recording function that digitally records a video stream of video and audio of broadcast programs on HDD (not shown) and Z or optical disk 114. Having. The optical disc 114 may be a Blu-ray disc (BD) or a recordable DVD (DVD-RAM, etc.). The recorder 100 can record a program stream to both a BD and a DVD. In the following, when distinguishing particularly, it is described as "BD114" or "DVD114". The format of the data stream recorded on the BD is an MPEG2 transport stream (hereinafter referred to as “transport stream” or “TS”). On the other hand, the format of the data stream recorded on the DVD is an MPEG2 program stream (hereinafter, referred to as “program stream” or “PS”).

The recorder 100 also has a playback function of reading a data stream recorded on the optical disc 114 and playing back a moving image. FIG. 1 shows another device that can cooperate in connection with the recording function and the reproduction function of the recorder 100. Processing relating to the recording function and the reproduction function of the recorder 100 is performed based on an instruction given by the user using the remote controller 116, buttons (not shown) of the recorder 100, or the like.

First, processing related to the recording function of the recorder 100 will be described. The recorder 100 is connected to an antenna 102a that receives a digital signal related to a digital broadcast program and an antenna 102b that receives an analog signal related to an analog broadcast program, and receives the digital signal and the analog signal. The recorder 100 receives a digital signal and an analog signal via the coaxial cable 104, for example. The stream format of the digital signal is TS.

In the present embodiment, the recorder 100 records a program on the HDD. This program is, It includes not only digital broadcast programs but also analog broadcast programs. The stream format when recorded on the HDD is either TS or PS. Which stream format is determined based on a user's instruction. Specifically, the recorder 100 inquires the user of the type of the recording medium of the dubbing destination prior to recording, and matches it. As a result, when DVD is designated as the recording medium of the dubbing destination, the program is recorded on the HDD by PS.

That is, if it is an analog broadcast program, the recorder 100 also generates a PS for the analog signal power and records it on the HDD. If it is a digital broadcast program, the recorder 100 converts the TS into a PS and records it on the HDD. On the other hand, when BD is specified as the recording medium of the dubbing destination, the HDD records the program in TS. That is, if it is an analog broadcast program, the recorder 100 generates a TS from the analog signal and records the TS on the HDD. If it is a digital broadcast program, the recorder 100 extracts necessary program data (packets) from the received TS, generates a partial TS, and records the partial TS on the HDD.

[0034] Strictly speaking, a stream (clip AV stream) different from that of the Pasinola TS is recorded on the HDD and the BD. The clip AV stream is generated by adding 4-byte information (time information indicating the packet arrival time, etc.) to each packet constituting the partial TS. Except for adding the information, the packet structure of the clip AV stream is the same as the packet structure of the partial TS. Therefore, hereinafter, it is assumed that the clip AV stream and the partial TS are substantially the same and that the partial TS is recorded on the HDD or the like.

Further, the recorder 100 is connected to the camcorder 110, can receive a digital stream recorded using the camcorder 110, and can record the digital stream on the HDD and Z or the optical disk 114. The stream generated by the camcorder 110 is, for example, a DV stream. The recorder 100 receives the DV stream from the camcorder 110, converts the stream into TS or PS, and records it on the HDD. Which stream format is to be converted is determined based on the user's instruction as in the case of the broadcast program. Furthermore, the recorder 100 can record a broadcast program on a memory card 112 such as an SD memory card or a Memory Stick (registered trademark). In this case, for example, it is an MPEG4 stream. Next, processing related to the playback function of the recorder 100 will be described. The recorder 100 decodes the video and audio recorded on the HDD or the optical disk 114, and reproduces the video and audio via the TV 106, a speaker (not shown), and the like. The video and audio are not limited to broadcast programs, and may be video and audio recorded by the camcorder 110, for example. The optical disk 114 on which the video and the audio are recorded may be taken out of the recorder 100 and loaded into another device such as the PC 108, and the device may reproduce the image.

Here, the data structure of the transport stream will be described with reference to FIGS. After that, the data structure of the program stream will be described with reference to FIGS.

FIG. 2 shows the data structure of the transport stream (TS) 20. The TS packets include, for example, a video TS packet (V—TSP) 30 storing compressed video data, an audio TS packet (A—TSP) 31 storing compressed audio data, and a program table. (Program · Association 'table; PAT) stored packet (PAT-TSP), program correspondence table (Program map table; PMT) stored packet (PMT-TSP) and program clock reference ( PCR) is stored in the packet (PCR-TSP). The data amount of each TS packet is 188 bytes.

Hereinafter, video TS packets and audio TS packets related to the processing of the present invention will be described. FIG. 3A shows the data structure of the video TS packet 30. The video TS packet 30 has a 4-byte transport packet header 30a and a 184-byte transport packet payload 30b. Video data 30b is stored in the payload 30b. On the other hand, FIG. 3B shows the data structure of the audio TS packet 31. Similarly, the audio TS packet 31 has a transport packet header 31a of 4 bytes and a transport packet payload 31b of 184 bytes. The audio data 31b is stored in the transport packet payload 31b.

[0040] As can be understood from the above example, a TS packet generally includes a 4-byte transport bucket header, and 184-byte elementary data and data. The packet header describes a packet identifier (Packet IDentifier; PID) for specifying the type of the packet. For example, the PID of a video TS packet is “0x0020” and the audio TS packet The PID of the packet is "0x0021". The elementary data is content data such as video data and audio data, control data for controlling reproduction, and the like. What data is stored depends on the type of packet.

Hereinafter, the relationship between the video data and the pictures constituting the video will be described using video data as an example.

FIGS. 4 (a) to 4 (d) show the relationship between the streams constructed when playing back a video picture from a video TS packet. As shown in FIG. 4A, the TS 40 includes video TS packets 40a to 40d. Note that the TS 40 may include other packets. Here, only video TS packets are shown. Video TS packets are easily identified by the PID stored in the header 40a-1.

[0042] A packetized elementary stream is configured from video data of each video TS packet such as video data 40a-2. FIG. 4B shows the data structure of the packet data elementary stream (PES) 41. The PES 41 is composed of a plurality of PES packets 41a, 41b and the like. The PES packet 41a is composed of a PES header 41a-1 and a PES payload 41a-2, and these data are stored as video data of a video TS packet!

[0043] Each of the PES payloads 41a-2 includes one picture data. An elementary stream is composed of the PES payload 41a-2. FIG. 4C shows the data structure of the elementary stream (ES) 42. The ES 42 has a plurality of sets of picture headers and picture data. It should be noted that the term "picture" is generally used as a concept including a shift between a frame and a field.

[0044] The picture header 42a shown in Fig. 4 (c) describes a picture coding type for specifying the picture type of the picture data 42b arranged thereafter, and the picture header 42c specifies the picture type of the picture data 42d. The picture coding type to be used is described! The type represents an I picture (Intra-coded picture), a P picture (Predictive-coded picture), or a B picture (Biairectionaliy-predictive-coded picture). If the type is an I picture, the picture coding type is “00 lb ,,” for example.

[0045] The picture data 42b, 42d, and the like are composed of one frame that can be constructed by the data alone or by the data and the data decoded before and after Z or after. Data. For example, FIG. 4D shows a picture 43a in which the picture data 42b is also constructed and a picture 43b constructed from the picture data 42d.

When reproducing a video based on a TS, the recorder 100 obtains a video TS packet, obtains picture data according to the above-described processing, and obtains a picture constituting the video. Thus, the video can be reproduced on the TV 106.

FIG. 5 shows a data structure of an MPEG2 program stream 50 conforming to the DVD video recording standard (hereinafter, referred to as “VR standard”) (hereinafter, this stream is referred to as “program stream 50”).

[0048] The program stream 50 includes a plurality of video object units (Video OBjects; VOBs) # 1, # 2, ..., #k. For example, assuming that the program stream 50 is recorded content, each VOB stores moving image data corresponding to one recording operation from when the user starts recording until the user stops recording.

[0049] Each VOB includes a plurality of VOB units (Video OBject units; VOBUs) # 1, # 2,

# Contains n. Each VOBU is a data unit that contains data of about 0.4 to 1 second in video playback time. Hereinafter, the data structure of the VOBU will be described with reference to the first VOBU and the next VOBU.

[0050] VOBU # 1 is composed of a plurality of packs. The data length (pack length) of each pack in the program stream 50 is constant (2 kilobytes (2048 bytes)). At the top of the VOBU, there are 51 real-time information packs (RDI packs) indicated by "R" in Fig. 5. After the RDI pack 51, a plurality of video packs indicated by "V" (video packs 52a, 52b, etc.) and audio packs indicated by "A" (audio packs 53, etc.) are included.

[0051] Each pack stores the following information. That is, the RDI pack 51 stores information used to control the reproduction of the program stream 50, for example, information indicating the reproduction timing of the VOBU, and information for controlling the copy of the program stream 50. . The video packs 52a, 52b, etc., store video data compressed by MPEG2. The audio pack 53 stores audio data compressed according to, for example, the MPEG2-Audio standard. Examples for adjacent video and audio packs For example, video data and audio data that are played back synchronously are stored, but their arrangement (order) is arbitrary.

[0052] VOBU # 2 is also composed of a plurality of packs. At the head of VOBU # 2, an RDI pack 54 is arranged, and thereafter, a plurality of video packs 55, audio packs 56, and the like are arranged. The content of the information stored in each pack is the same as VOBU # 1.

FIG. 6 shows a data structure of a video pack in the program stream 50. Hereinafter, the video pack 52a will be described as an example. The video pack 52a stores MPEG2 compressed video data 62a. In addition to the pack header 62b and the PES packet header 62c that specify that the video pack 52a is a video pack, a system header (not shown) is also included in the pack header 62b for the first VOBU video pack. It is.

[0054] The video data 62a of the video pack 52a shown in Fig. 6 constitutes the data of the I frame 65 together with the video data 63a and the like after the subsequent video pack 52b. In addition, a B-frame 66 following the I-frame and a video pack that composes the P-frame are continuously recorded.

The video data 62a includes a sequence header 67 and a GOP header 68. In the MPEG2 standard, a “group of picture” (GOP) in which a plurality of video frames are put together is defined, and a GOP header 68 indicates the head of the group. The first frame of a GOP is always an I-frame.

Note that the picture data (for example, the picture data 42b and 42d) shown in FIG. 4C and the frame data (for example, the data of the I frame 65) shown in FIG. 6 are compression-coded based on the MPEG2 standard. This is video data. When the picture data shown in FIG. 4 (c) has the standard resolution, the picture data may be the same as the frame data shown in FIG. Therefore, if picture data is obtained based on each video TS packet, it is easy to generate a PS video pack using the picture data. The reverse is also true. However, if the picture data shown in FIG. 4 (c) has a high resolution, it is decoded and then converted into a standard resolution video by thinning out, etc., and encoded again to obtain the frame shown in FIG. You need to build data. For audio, if audio data of the AAC standard is obtained based on, for example, an audio TS packet, it is easy to generate a PS audio pack using the audio data. Next, the configuration of the recorder 100 according to the present embodiment will be described with reference to FIG. FIG. 7 shows a functional block configuration of the recorder 100. The recording medium in the recorder 100 is an optical disk 205a and a hard disk 205b. The optical disk 114 and the optical disk 205a in FIG. 1 are the same.

[0058] The recorder 100 includes a digital tuner 201a and an analog tuner 201b, an AD converter 202, an MPEG-2 encoder 203, a disk control unit 204, an MPEG-2 decoder 206, and a graphic control unit 207. , A memory 208, a DA converter 209, a CPU bus 213, a network control unit 214, an instruction receiving unit 215, an interface (iZF) unit 216, a memory card control unit 217, and a system control unit 250. Including. In FIG. 7, the optical disk 205a in which the optical disk 205a is described in the recorder 100 is removable from the optical disk recorder 100, and is not a component of the recorder 100 itself. Also, in FIG. 7, a removable HDD that exemplifies a built-in fixed HDD may be used.

Hereinafter, the function of each component will be described. Digital tuner 201a receives a digital signal containing one or more programs from antenna 102a (FIG. 1). A transport stream transmitted as a digital signal contains packets of multiple programs. A transport stream containing packets of multiple programs is called "full TS". The digital tuner 2 Ola selects a channel, extracts only the packets of the required program from the full TS, and outputs it as a "partial TS".

The procedure for extracting a packet of a desired channel from a full TS is as follows. Let X be the program number (channel number) of the desired program. First, the program guide packet (PAT-TSP in Fig. 2) is searched from the full TS. Since 0 is always given to the packet ID (PID) of the program guide packet, it is sufficient to search for a packet having that value. The program table in the program table packet stores each program number and the PID of the program correspondence table packet (PMT-TSP in FIG. 2) of each program corresponding to the program number. Thus, the packet ID (PID) of the program correspondence table PMT corresponding to the program number X can be specified. Let XX be the PID of the program correspondence table PMT.

[0061] Next, the program correspondence table packet (PMT TSP in Fig. 2) with PID = XX is extracted. , A program correspondence table PMT corresponding to the program number X is obtained. The program correspondence table PMT stores, for each program, the PID of a TS packet that stores video and audio information constituting each program as a target for viewing. For example, the PID of video information of program number X is XV, and the PID of audio information is XA. Using the PID (= XV) of the packet storing the video information obtained in this way and the PID (= XA) of the packet storing the audio information, the video 'audio Can be extracted.

When a partial TS is generated from a full TS, not only a packet storing necessary video and audio information is extracted, but also a PSI (Program Specific Information) bucket and an SI (Service Information) packet are extracted. And need to change. The PSI packet is a packet that generically refers to the program guide packet (PAT-TSP) and the program correspondence table packet (PMT-TSP) shown in FIG. The reason why the PSI packet is modified is that the program list and the program correspondence table need to be adapted to the partial TS because the number of programs included in the full TS and the partial TS are different. On the other hand, the SI packet is a packet that includes the contents of the program included in the full TS, data describing the schedule Z timing, etc., and uniquely defined extended information (these are also called “program arrangement information”). In a full TS, the data contained in the SI packet is as many as 20 to 30 types. Of these data, only the data important for the reproduction of the partial TS is extracted, and one SIT packet is generated and multiplexed in the partial TS. In the partial TS, information (partial transport stream descriptor) indicating that the stream is a partial TS is stored in the SIT packet. It is customary to multiplex SIT packets within a partial TS. This is for consistency with the digital broadcasting regulations in Europe and Japan (DVBZARIB).

[0063] The analog tuner 201b also receives the analog signal from the antenna 102b (Fig. 1), selects a channel based on the frequency, and extracts a signal of a necessary program. Then, the video and audio signals of the program are output to the AD converter 202. In FIG. 1, since the recorder 100 acquires a digital signal and an analog signal via the coaxial cable 104, the signal system input to FIG. 7 is exactly one. However, digital and analog signals can be easily separated by frequency, so Figure 7 shows digital and analog signals. No. is entered in another system.

The AD converter 202 converts the input signal into a digital signal and supplies it to the MPEG-2 encoder 203. The MPEG-2 encoder 203 (hereinafter referred to as “encoder 203”) receives the uncompressed digital data output from the A / D converter 202. Alternatively, the encoder 203 receives the uncompressed digital data output from the MPEG2 decoder 206 via the CPU bus 213. When receiving a recording start instruction and uncompressed digital data, the data is compressed and encoded, and a partial TS or PS is generated and output based on an instruction from the system control unit 250. This process is continued until the encoder 203 receives the recording termination instruction. The encoder 203 has a buffer (not shown) for temporarily storing reference pictures and the like in order to perform compression coding.

[0065] The disk control unit 204 receives the partial TS or PS and records it on the HDD 205b. The disk control unit 204 reads a partial TS from the HDD 205b or the like when playing a moving image, and outputs the stream to the MPEG-2 decoder 206.

The disk control unit 204 writes and reads a stream to and from the HDD 205b along with rotation of the disk, movement of the head, and the like. The same applies to the optical disk 205a.

[0067] The MPEG-2 decoder 206 (hereinafter, referred to as "decoder 206") analyzes the supplied partial TS or PS to acquire MPEG-2 compression encoded data. Then, the compressed and encoded data is decompressed and converted into uncompressed data. The data is output to the CPU bus 213 and sent to the encoder 203 at the time of recording and when the recorder 100 performs a process of changing the partial TS to PS. During reproduction, it is supplied to the graphic control unit 207.

[0068] The graphic control unit 207 is connected to a memory 208 for internal calculation, and can realize an on-screen display (OSD) function. For example, the traffic control unit 207 can combine various menu images and videos and output the result to the DA converter 209. The DA converter 209 converts the input OSD composite image and audio data into analog data and outputs the converted data. The output destination is the TV 106, for example.

[0069] The CPU bus 213 is a path for transmitting signals in the recorder 100, and as shown in FIG. Connected to functional blocks. In addition, components of a system control unit 250 described later are also connected to the CPU bus 213.

[0070] The network control unit 214 is an interface for connecting the recorder 100 to the network 101 such as the Internet, and is, for example, a terminal and a controller compliant with the Ethernet (registered trademark) standard. The network control unit 214 sends and receives data via the network 101. This data is, for example, program table data relating to a broadcast program or update data of a software program for controlling the operation of the recorder 100.

The instruction receiving unit 215 is an operation button provided on the main body of the recorder 100 or a light receiving unit that receives infrared rays from the remote controller 116. The instruction receiving unit 215 copies, for example, an instruction to start recording, stop Z, start reproduction of a recorded program, stop Z, or the like, or copy a still image of the loaded memory card 112 to the optical disk 205a or the HDD 205b from the user. Receive instructions.

The interface (IZF) unit 216 controls a connector for the recorder 100 to communicate with another device and controls the communication. The IZF unit 216 includes, for example, a terminal of the USB 2.0 standard, a terminal of the IEE E1394 standard, and a controller that enables data communication according to each standard, and can transmit and receive data in a system conforming to each standard. For example, the recorder 100 is connected to a PC 108, a camcorder 110, or the like via a USB 2.0 standard terminal, and is connected to a camcorder, a digital Hi-Vision tuner, or the like via an IEEE 1394 standard terminal. Alternatively, if the recorder does not include the digital tuner 201a, a digital signal (partial TS) from an externally connected digital tuner is input via the I / F unit 216.

[0073] The memory card control unit 217 is a controller for controlling a slot for loading the memory card 112 into the recorder 100 and controlling data communication between the recorder 100 and the memory card 112.

[0074] The system control unit 250 controls the overall processing including the flow of signals in the recorder 100. The system control unit 250 has a program ROM 210, a CPU 211, and a RAM 212. Each is connected to the CPU bus 213. The program ROM 210 stores a software program for controlling the recorder 100. The CPU 211 is a central control unit that controls the entire operation of the recorder 100. The CPU 211 reads and executes the program to generate a control signal for realizing a process defined based on the program, and outputs the control signal to each component via the CPU bus 213. The memory 212 has a work area for storing data necessary for the CPU 211 to execute a program. For example, the CPU 211 reads a program from the program ROM 210 to the random access memory (RAM) 212 using the CPU bus 213, and executes the program. The computer program is recorded on a recording medium such as a CD-ROM and distributed on the market, or transmitted through a telecommunication line such as the Internet. This allows a computer system configured using a PC or the like to operate as a data processing device having functions equivalent to those of the recorder 100 according to the present embodiment.

Hereinafter, particularly important configurations and operations of the present embodiment will be described with reference to FIGS. 8 to 11.

FIG. 8 schematically shows a transfer path of a program data stream used at the time of recording. In order to explain the flow of data, FIG. 8 does not show the disk control unit 204, the CPU bus 213, and the like. As described above, the recording destination of the initial program is the HDD 205b. Then, it is assumed that the user has already received an instruction at the time of the start of recording by the user as to whether the data stream of the program stored in the HDD 205b will be dubbed into a BD or a DVD in the future.

First, the flow of data when recording a digital broadcast program will be described. The partial TS output from the digital tuner 201a is first input to the switch 250a.

When the dubbing destination optical disk is a BD, the switch 250a allows the partial TS of the digital broadcast program to flow as it is to the HDD 205b. Then, the HDD 205b holds the data structure of the partial TS (more precisely, holds the data structure of the clip AV stream) and records the TS.

On the other hand, if the optical disc at the dubbing destination is a DVD, the switch 250a allows the partial TS to flow along the path to the decoder 206. The decoder 206 decodes the partial TS and sends it to the encoder 203 as an uncompressed digital data stream. In FIG. 8, the switch 250a is drawn as if it were hardware, but is not limited to hardware. The route selection by the switch 250a can be performed by the system control unit 250 as a software-based route selection process. Here, it is assumed that the selection is performed by software processing.

[0082] The encoder 203 has a PS encoder 203a and a TS encoder 203b. The encoder 203 may have a PS encoder 203a and a TS encoder 203b as hardware, but selectively execute the PS generation process and the TS generation process by software to perform the encoding process and the stream generation. May go.

[0083] The uncompressed digital data stream output from decoder 206 is input to PS encoder 203a. The PS encoder 203a compression-encodes the received stream based on the MPEG2 standard and generates the PS shown in FIGS. 5 and 6. At this time, if the program is a high-resolution video, the PS encoder 203a converts the resolution of the video in the partial TS to a standard resolution and generates a PS. The conversion process from the high-resolution video to the standard resolution may be performed by generating one pixel configuring the standard resolution video from a plurality of pixels configuring the high resolution video. For example, in order to reduce the resolution by half in both the vertical and horizontal directions, every other pixel of the high-resolution video may be adopted as the pixel of the standard resolution video. Many resolution conversion processes have been developed. In the present embodiment, any of them may be used. Since such conversion processing is well known, details of the processing are omitted.

[0084] The PS encoder 203a adjusts the data rate of the PS to be generated so that the data rate does not exceed the maximum value (10.0 Mbps) of the DVD data transfer rate (below the maximum value). Then, when the PS encoder 203a generates the PS, the PS encoder 203a sends the PS to the path to the HDD 205b. The HDD 205b records the PS while retaining its data structure.

[0085] When the video included in the TS of the recorded program has the standard resolution and the audio is in the AAC format or the like, the compression-encoded data in the TS is compressed! do not have to. In other words, when the elementary stream of the TS can be used as the elementary stream of the PS, the decoder 206 only has to perform decoding until the elementary stream is obtained, that is, only system decoding. In this case, the decoder 206 Instead of outputting an uncompressed digital data stream, it outputs an elementary stream that has been compressed and encoded. At the same time, the PS encoder 203a receives the elementary stream and generates a PS.

Next, the flow of data when recording an analog broadcast program will be described. The uncompressed digital data stream obtained through the analog tuner 201b and the AD converter 202 is input to the switch 250a.

If the dubbing destination optical disc is a BD, the switch 250a inputs the stream to the TS encoder 203b. The TS encoder 203b compresses and encodes the received stream based on the MPEG2 standard, and generates TS shown in FIGS. 2 to 4. Then, the TS encoder 203b allows the generated TS to flow through the path leading to the HDD 205b. Then, the HDD 205b holds the data structure of the TS and records the TS.

On the other hand, if the dubbing destination optical disk is a DVD, the switch 250a is input to the uncompressed digital data stream power SPS encoder 203a. The PS encoder 203a compression-encodes the received stream based on the MPEG2 standard and generates the PS shown in FIGS. 5 and 6. Then, the PS encoder 203a allows the generated PS to flow through the path to the HDD 205b. Then, the HDD 205b records the PS while retaining the data structure.

FIG. 9 shows a procedure of a recording process according to the present embodiment. In step S11, the system control unit 250 inquires of the user about the channel number of the program to be recorded and the type of the recording medium scheduled to be dubbed. The timing of the inquiry is, for example, during a recording reservation procedure or when a recording button of the remote controller 116 or the like is pressed. Recorder 100 displays the message "Please specify the dubbing mode. Is it a DVD or BD?" On the screen of the TV 106 (Fig. 1). Then, the user uses the remote controller 116 to send an instruction for specifying which recording medium is the dubbing destination. In addition, the channel number may be specified by specifying the number, or by using the electronic program table (EPG), which has recently been implemented, the power can also be specified by selecting the program! / ,.

As a result of this inquiry, the recorder 100 also receives an instruction from the user via the instruction receiving unit 215. The system control unit 250 can specify whether the program is an analog broadcast program or a digital broadcast program based on the channel number of the program to be recorded. In addition, BD or DVD can be specified based on the type of recording medium that is scheduled for the future.

[0091] In step 12, the system control unit 250 determines whether the dubbing destination is a BD. If it is a BD, the process proceeds to step S13 to perform a process assuming dubbing to a BD. If it is a DVD, the process proceeds to step S14 to perform a process assuming dubbing to a DVD.

[0092] In step S13, system control section 250 determines whether or not the program to be recorded is a digital broadcast program based on the channel number. If it is a digital broadcast program, the process proceeds to step S15, and if it is an analog broadcast program, the process proceeds to step S16. In step S15, the recorder 100 receives the digital signal (TS) of the program, and records the extracted TS as it is on the HDD 205b. In step S16, the analog signal of the program is received, encoded in the TS, and recorded in the HDD. When the recording processing on the HDD 205b in step S15 or step S16 ends, the entire processing ends.

[0093] On the other hand, in step S14, system control section 250 determines whether or not the recording target program is a digital broadcast program based on the channel number. If it is a digital broadcast program, the process proceeds to step S17, and if it is an analog broadcast program, the process proceeds to step S18. In step S17, the recorder 100 receives the digital signal of the program, decodes the digital signal in the decoder 206, encodes it into the PS in the PS encoder 203a, and records it in the HDD 205b. In step S18, the analog signal of the program is received, encoded into the PS by the PS encoder 203a, and recorded on the HDD 205b. When the recording processing on the HDD 205b in step S17 or step S18 ends, the entire processing ends.

[0094] Next, a dubbing process of the program data stream recorded by the above-described recording process will be described.

FIG. 10 schematically shows a transfer path of a program data stream used at the time of dubbing. In FIG. 10, signal lines with thin arrows and signal lines with thick arrows are mixed. The thin signal line shows the transfer path of the data stream of the program, and the thick signal line shows the transfer path of the control signal.

[0096] In the dubbing process, the data stream (PS or TS) 1S HDD 205b of the program is also transferred to the DVDZBD shared drive and written to the optical disk 205a. [0097] At this time, the HDD control unit 204a and the optical disk control unit 204b, the switch 250b, the media detection unit 250c, the upper limit data rate control unit 250d, the format detection unit 250e, the format control unit 250f, and the PS → A TS encoder 701 and a TS → PS encoder 702 are used.

[0098] Each of the HDD control unit 204a and the optical disk control unit 204b is implemented as one function of the disk control unit 204 in FIG. The HDD control unit 204a controls data input / output for the HDD 205b. The optical disk control unit 204b controls data input / output for the optical disk 205a.

[0099] The switch 250b selects an output path of the data stream output from the HDD control unit 204a based on a control signal from the format control unit 250f. The output destination is one of the optical disk control unit 204b, PS → TS encoder 701 and TS → PS encoder 702

[0100] The media detection unit 250c detects the type of the media loaded in the BD / DVD shared drive. For example, since the incident surface force of laser light and the depth to the information recording layer differ between DVD and BD, the type of optical disc can be determined by detecting the depth of the loaded optical disc. Alternatively, when the disc is housed in a cartridge, a sensor or the like for detecting a difference in the shape of the cartridge may be provided, and the type of the optical disc may be determined based on the output from the sensor.

[0101] When the type of the detected optical disc is BD, upper limit data rate control section 250d supplies the rate upper limit of the BD to PS → TS encoder 701. When the type of the detected optical disk is DVD, the upper limit of the DVD rate is supplied to the TS → PS encoder 702. The format detection unit 250e detects the format (PS or TS) of the data stream output from the HDD control unit 204a and supplies the data stream to the format control unit 250f. The detection is performed based on the difference between the data structures of the TS and the PS in FIGS.

[0102] The format control unit 250f receives the information specifying the stream format output from the format detection unit 250e, and the information of the media type output from the media detection unit 250c. Then, based on the information, the format control unit 250f instructs the system control unit 250b on a path to be selected. [0103] The PS to TS encoder 701 has a function of converting a PS to a TS. On the other hand, the TS → PS encoder 702 has a function of converting TS into PS. These functions can be realized by an encoder 203 and a decoder 206 shown in FIG. For example, the PS → TS encoder 701 decodes the PS in the decoder 206 and generates an uncompressed data stream. Then, the uncompressed data stream may be converted into TS in the encoder 203. As shown in FIG. 8, since the encoder 203 has the TS encoder 203b, it is easy to generate a TS even with an uncompressed data stream using the TS encoder 203b. The same applies to the other TS → PS encoder 702. That is, the TS → PS encoder 702 decodes the TS in the decoder 206 and generates an uncompressed data stream. Then, the uncompressed data stream may be converted into PS in the encoder 203. As shown in FIG. 8, since encoder 203 has PS encoder 203a, it is easy to generate PS from an uncompressed data stream using PS encoder 203a.

[0104] The reason for providing the encoders 701 and 702 is to provide convenience to the user so that dubbing can be performed even when the originally specified recording medium is not actually used as the recording medium of the dubbing destination. is there. However, in order to obtain the remarkable effect of the present embodiment, it is necessary to use the recording medium designated at the time of recording at the time of actual dubbing, and it is preferable not to use the encoders 7001 and 702. The provision of the PS → TS encoder 701 and the TS → PS encoder 702 does not increase the manufacturing cost of the recorder 100. The reason is that the same processing can be realized by combining the processing of the existing encoder 203 and the processing of the decoder 206.

[0105] Each of the switch 250b, the media detection unit 250c, the upper limit data rate control unit 250d, the format detection unit 250e, and the format control unit 250f illustrated in FIG. 10 may be realized by hardware, or may be realized by the system control unit 250. It may be realized as software-based route selection processing. In the following, a description will be given assuming that the selection is performed by software processing.

Next, the process will be described by giving an example of dubbing a TS in the HDD 205b to a DVD-RAM. When the DVD-RAM 205a is loaded in the BDZDVD shared drive, the media detection unit 25Oc detects that the loaded optical disk is a DVD-RAM. Then, the media detection unit 250c notifies the information of the media type to the upper limit data rate control unit 250d and the dubbing stream format control unit 250f. The TS of the program to be dubbed is read and output by the HDD control unit 204a. The format detector 250e detects that the output stream is a TS, and outputs the result to the format controller 250f.

[0108] DVD—The stream that can be recorded in RAM is PS. Upon receiving the media type information and the stream format information, the format control unit 250f determines that the TS cannot be recorded on the DVD-RAM. Therefore, in the present embodiment, the TS is converted to the PS by decoding the input TS into a baseband signal and encoding the PS again. The switch 250b connects the HDD control unit 204a and the TS → PS encoder 702, and converts the dubbing source TS to PS. Convert to standard resolution if necessary. At this time, the upper data rate control unit 250d controls the TS → PS encoder 702 so that the upper limit of the transfer rate at the time of PS encoding does not exceed the upper limit of the DVD medium. The optical disk control unit 204b sequentially records the obtained PS in the DVD-RAM.

When the conversion of the stream recorded on the HDD 205b is completed and the converted stream is recorded on the DVD-RAM 204a, the dubbing process is completed. Note that the TS remains in the HDD 205b even after the dubbing from the HDD 205b to the DVD-RAM 204a is completed. However, if copyright information indicating “copy once” is added to the TS, the TS is treated as a so-called move operation, and the TS is deleted from the HDD 205b.

[0110] Hereinafter, the procedure of the process of dubbing the data stream of the program will be described with reference to FIG. FIG. 11 shows the procedure of the dubbing process according to the present embodiment. It is assumed that TS and PS are mixedly recorded on the HDD 205b.

[0111] In step S21, when the user's power also receives the dubbing instruction, the system control unit 250 asks the user which program to dub! For example, "Which program do you want to dub?" Is displayed on the screen of the TV 106, and the user waits for an input. The user selects or inputs a program name using the remote controller 116 or the like to specify the program name. At this time media detection The unit 250c determines the type of the loaded optical disk 205a, and acquires information on the type. Note that the media detection unit 250c may determine the type of the optical disc when it is loaded. In this case, the detection result indicating the type may be held, and the detection result may be output when an instruction to start dubbing is received. When the program to be dubbed is specified, the HDD control unit 204a reads the stream of the program and sends it to the format detection unit 250e. The format detector 250e specifies the format of the stream.

[0112] In step S22, the system control unit 250 compares the stream format of the dubbing target program with the stream format recordable on the dubbing destination recording medium. Then, in the next step S23, it is determined whether or not the stream formats match. When it is determined that they match, the process proceeds to step S24, and when it is determined that they do not match, the process proceeds to step S25. The result of this determination is reflected in the switching process of the switch 250b. Specifically, when they match, the switch 250b directly connects the HDD control unit 204a and the optical disk control unit 204b. If they do not match, the switch 250b connects the HDD control unit 204a to the PS → TS encoder 701, or connects the HDD control unit 204a to the TS → PS encoder 702.

[0113] In the case of a mismatch, the connection destination is further changed as follows. When the PS is recorded on the HDD 205b and the BD is loaded, the switch 250b connects the HDD control unit 204a with the PS → TS encoder 701. On the other hand, when a TS is recorded on the HDD 205b and a DVD is loaded, the switch 250b connects the HDD control unit 204a with the TS → PS encoder 702.

[0114] In step S24, the HDD control unit 204a reads the stream of the dubbing target program and records it on the optical disc. At this time, it should be noted that stream analysis is not required in the dubbing process from the HDD 205b to the optical disk 205a in step S24. You just need to do a file transfer (data transfer). Since reading and writing can be performed at the maximum transfer rate of the optical disk 205a and the HDD 205b without depending on the playback rate of the stream, the speed is extremely high. This advantage is remarkable when the number “a” is recorded in the procedure shown in FIG. 9 and the recording medium of the dubbing destination designated at the time of recording is actually loaded.

[0115] On the other hand, in step S25, the recorder 100 sets the stream format of the dubbing target program to the To a stream format recordable on the destination recording medium. This conversion process is performed while reading the stream of the dubbing target program. This conversion processing also includes resolution conversion processing. For example, if you plan to dub to a BD initially and record the program in a high-resolution video TS, and it is necessary to record the program on a DVD, the TS → PS encoder 702 converts the TS to PS, and Performs processing to convert video to standard resolution video.

[0116] Then, in step S26, the recorder 100 sequentially sends the converted stream to the optical disc control unit 204b while converting the stream format using the encoders 701 and 702 for IJ. The optical disk control unit 204b receives the stream and records it on the loaded optical disk 205a. When the conversion of the stream recorded on the HDD 205b is completed and the converted stream is recorded on the optical disk 205a, the dubbing process is completed.

[0117] At the time of recording a program, a dubbing destination recording medium is specified abruptly, and a dubbing process is performed in a stream format suitable for recording on the recording medium on another recording medium (HDD205b). Completes very quickly. Even when dubbing to a recording medium different from the originally specified recording medium, the required stream format and the upper limit of the data transfer rate are controlled based on the information of the dubbing source stream and the dubbing destination medium, so that it is correct. Dubbing can be performed in a stream format without causing a data transfer rate error.

Industrial applicability

The present invention is applicable not only to an optical disc recorder having a built-in digital Z analog broadcast tuner and HDD, but also to various types of digital devices and systems having a dubbing function.

Claims

The scope of the claims

[1] A data processing device for writing a data stream of content to a first recording medium and dubbing the content to a second recording medium,

A first data stream and a second data stream having different formats can be written on the first recording medium,

A receiving unit capable of writing the second data stream on the second recording medium, and receiving type information for specifying the type of the second recording medium as a content to be dubbed;

A recording control unit that acquires the second data stream based on the type information and writes the second data stream to the first recording medium;

A data processing device comprising:

[2] The content is an analog broadcast program,

The data processing device according to claim 1, further comprising: an encoder that generates the second data stream based on an analog signal related to the analog broadcast program.

[3] The content is a digital broadcast program,

2. The data processing device according to claim 1, wherein the recording control unit acquires the second data stream based on a digital signal related to the digital broadcast program.

[4] a decoder that acquires the first data stream including encoded data from a digital signal related to the digital broadcast program, decodes the encoded data, and outputs digital data;

An encoder for encoding the digital data to generate the second data stream;

4. The data processing device according to claim 3, further comprising:

[5] The second recording medium has a maximum data transfer rate defined therein,

5. The data processing device according to claim 4, wherein the encoder generates the second stream having a data rate equal to or less than the maximum value.

6. The data processing device according to claim 1, wherein the first recording medium is a hard disk, and the second recording medium is an optical disk.

[7] The second recording medium is a recordable DVD,

7. The data processing device according to claim 6, wherein the recording control unit writes an MPEG2 program stream as the second data stream on the first recording medium.

[8] The second recording medium is a recordable Blu-ray disc,

7. The data processing device according to claim 6, wherein the recording control unit writes an MPEG2 transport stream as the second data stream on the first recording medium.

[9] a detection unit that detects a type of the loaded recording medium and outputs a detection result;

A system control unit that specifies the format of a data stream that can be written to the loaded recording medium based on the detection result, and writes the specified data stream to the loaded recording medium. When

Further comprising

The instruction unit receives an instruction to start dubbing the content,

In response to the instruction to start dubbing,

The detection unit outputs a detection result indicating the loading of the second recording medium,

The recording control unit reads the second data stream from the first recording medium, and the system control unit determines that the format of the second data stream matches the format that can be written to the second recording medium. 2. The data processing device according to claim 1, wherein the second data stream is written to the second recording medium.

[10] A method for writing a data stream of content to a first recording medium and dubbing the content to a second recording medium,

Receiving the type information specifying the type of the second recording medium as the dubbing target of the content, wherein the second data stream is writable on the second recording medium;

Obtaining the second data stream based on the type information; andwriting the second data stream to the first recording medium.

A data processing method including: In response to the instruction to start dubbing the content,

Outputting a detection result indicating the type of the loaded recording medium; and when the detection result indicates the second recording medium, the first recording medium force is obtained by the acquiring step. Writing the read second data stream to the loaded second recording medium;

11. The data processing method according to claim 10, further comprising: