JP2007124445A - Digital broadcasting recording reproducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcasting recording reproducer capable of reducing an H/W scale without deteriorating the quality of a reconstructed image as much as possible. <P>SOLUTION: The digital broadcasting recording reproducer has a digital broadcasting receiving section 1 and a storage section 2. A demodulating/decoding section 11 for the digital broadcasting receiving section 1 demodulates/decodes a digital broadcasting signal and generates a TS data while generating a decoding error signal S<SB>e</SB>indicating a signal containing a decoding error in a TS packet constituting the TS data. A data conversion section 23 for the storage section 2 processes the TS data at a TS-packet unit on the basis of the decoding error signal in the case of a data recording, and records the time information of the processed TS data and the TS packet to a storage device 24. The data conversion section 23 for the storage section 2 further reproduces the TS data from the storage device 24 while referring to the time information recorded to the storage device 24 in the case of a data reproduction, and practices an arbitrary discontinuous processing for a discontinuous period generated in the processed TS data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital broadcast recording / reproducing apparatus for receiving and storing a broadcast signal of a digital broadcast standard and reproducing the stored video data.

  As a conventional terrestrial digital broadcast receiver, a broadcast wave received by an antenna is demodulated and decoded into transport stream (TS) data by a front end block, and TS data output from the front end block is converted to CA (Conditional Access) data. Some scramble, TS-DEMUX (TS demultiplex), and then decode and output video and audio by an MPEG decoder (for example, see Non-Patent Document 1).

  In such a device, movement may enter an area where it is difficult to receive broadcast waves from the transmitting station, and the quality of video and audio may be significantly reduced, or video and audio may be temporarily unavailable for viewing. is there. For this reason, there is a proposal for an in-vehicle TV recording / playback apparatus that has a broadcast signal recording / playback function and can speed up or exclude playback of a portion of a recorded broadcast that is determined to have a bad recording state (for example, , See Patent Document 1).

  In addition, when missing data occurs due to the inability to receive broadcast waves, communication with the server is established, and missing data that could not be received is downloaded to the built-in storage unit to cover the part that could not be received. There is also a proposal of an apparatus that can do this (for example, see Patent Document 2).

Japanese Patent Laying-Open No. 2003-244591 (page 4-7, FIG. 1) JP 2004-304498 A (page 3-4, FIG. 1) Japan Radio Industry Association, ARIB STD-B21 (4th page, Fig. 2-2)

  The above-described conventional apparatus records all data even if it is difficult to receive broadcast signals and the quality of TS data demodulated and decoded by the front end block is poor. For this reason, even in a mobile device where a hardware (H / W) configuration that is as small as possible is desired, the storage capacity of the data storage device increases, and the overall H / W scale increases. There was a point.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and its purpose is a digital that can reduce the H / W scale without causing a reduction in the quality of a reproduced image as much as possible. A broadcast recording / reproducing apparatus is provided.

  A digital broadcast recording / reproducing apparatus of the present invention generates a transport stream data by demodulating and decoding a digital broadcast signal, and includes a transport stream including a decoding error in transport stream packets constituting the transport stream data A demodulator / decoder that generates a decoding error signal indicating a packet; and at the time of data recording, the transport stream data is converted into a transport stream packet unit, a video decoding data unit, or an audio decoding data unit based on the decoding error signal The transport stream data processed and processed and the time information of the transport stream packet constituting the transport stream data are recorded in the storage device, and the time recorded in the storage device during data reproduction is recorded. A data converter that reproduces the processed transport stream data from the storage device while referring to information, and executes arbitrary discontinuous processing in a discontinuous period generated in the processed transport stream data; It is characterized by having.

  According to the present invention, at the time of data recording, transport stream data is processed in units of transport stream packets, video decoding data units, or audio decoding data units based on a decoding error signal, and processed transport stream data And the time information of the transport stream packets constituting the transport stream data are recorded in the storage device, so that the storage capacity of the storage device for recording the broadcast signal can be reduced.

  In addition, during the data reproduction, the processed transport stream data is reproduced from the storage device while referring to the time information recorded in the storage device, and an arbitrary period is generated in the discontinuous period generated in the processed transport stream data. Since the discontinuous process is executed, the screen or sound during the discontinuous period can be set so that it is difficult for the user to feel uncomfortable.

  Further, in parallel with the discontinuous processing at the time of data reproduction, preparation for processing of normal transport stream data after the discontinuous period can be performed, so that the reproduction start of normal transport stream data can be accelerated.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a digital broadcast recording / reproducing apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a digital broadcast recording / reproducing apparatus according to Embodiment 1 receives a digital broadcast wave, demodulates / decodes the digital broadcast receiver 1, and records / decodes the digital broadcast decoded data. And an accumulating unit 2 that can be reproduced. The digital broadcast receiver 1 displays an image based on the decoded and analog-converted image signal, for example, a display device 5 such as a liquid crystal display, and outputs audio based on the decoded and analog-converted audio signal. For example, an audio output device such as a speaker is connected. When the digital broadcast recording / reproducing apparatus according to Embodiment 1 is a television (TV) system having a broadcast recording / reproducing function, the display device 5 and the audio output device 6 are one of the digital broadcast recording / reproducing apparatuses. Part.

As shown in FIG. 1, the digital broadcast receiver 1 includes a first antenna (hereinafter also simply referred to as “antenna”) 10 that receives broadcast waves such as digital broadcast or digital audio broadcast, and the antenna 10. de demodulation / decoding unit 11, a first switch 12, the decoded TS data output from the first switch 12 to the received signal by demodulating and decoding and generates a TS data and the decoded error signal S _e A demultiplexing part (DEMUX part) 13 for multiplexing, a second switch 14, a third switch 15, an MPEG decoder 17, and a D / A for converting image data decoded by the MPEG decoder 17 into an analog signal A conversion unit 18 and a D / A conversion unit 19 that converts the audio data decoded by the MPEG decoder 17 into an analog signal are provided. The first switch 12 has a function of outputting data from the demodulation / decoding unit 11 to the DEMUX unit 13 and / or the third switch 15 and a function of outputting data from the third switch 15 to the DEMUX unit 13. The second switch 14 has a function of outputting data from the DEMUX unit 13 to the subsequent MPEG decoder 17 and / or the third switch 15 and a function of outputting data from the third switch 15 to the MPEG decoder 17. The third switch 15 selects either the first switch 12 or the second switch 14 during data recording and outputs data from either the first switch 12 or the second switch 14 to the storage unit 2. The third switch 15 selects either the first switch 12 or the second switch 14 during data reproduction, and outputs the data from the storage unit 2 to either the first switch 12 or the second switch 14. To do. In FIG. 1, the antenna 10 is described as a part of the digital broadcast recording / reproducing apparatus. However, the antenna 10 may be an external device connected to the digital broadcast recording / reproducing apparatus.

As shown in FIG. 1, the storage unit 2 includes a data conversion unit 23 and a storage device 24 such as a semiconductor storage device, a hard disk device, or an optical disk device. The data converter 23 refers to the decoding error signals S _e and S _ed from the digital broadcast receiver 1, processes the TS data from the digital broadcast receiver 1 in units of TS packets, and stores the processed TS data In addition to outputting to the device 24, it has a function of outputting time information of TS packets to the storage device 24. Further, the data conversion unit 23 reproduces the data while reproducing the TS rate at the time of data recording using the time information stored in the storage device 24 for the TS data read from the storage device 24. Has function. In FIG. 1, the storage device 24 is shown as a part of the digital broadcast recording / reproducing device. However, the storage device 24 is not necessarily a part of the digital broadcast recording / reproducing device, and the storage device 24 An external device connected to the digital broadcast recording / reproducing apparatus may be used.

  Next, the operation of the digital broadcast recording / reproducing apparatus according to Embodiment 1 will be described with reference to FIG. The operation of the digital broadcast recording / reproducing apparatus is controlled by a control unit (not shown). The antenna 10 of the digital broadcast receiver 1 receives a broadcast wave of digital broadcast and / or digital audio broadcast. The demodulator / decoder 11 demodulates the received signal from the antenna 10, performs Reed-Solomon (RS) decoding at the end of various processes, and performs TS packet in 188-byte units (ie, TS data) in which all error correction has been performed. The fixed-length packet to be configured) is output to the subsequent stage. The DEMUX unit 13 selects only an arbitrary program in the TS data input from the demodulation / decoding unit 11 via the first switch 12 (that is, selects only a part of TS packets in the TS data). The partial TS data is output to the MPEG decoder 17 via the second switch 14. The MPEG decoder 17 decodes image data and audio data which are partial TS data from the DEMUX unit 13. Image data and audio data output from the MPEG decoder 17 are converted into analog signals by the D / A converters 18 and 19, respectively, and output to the display device 5 and the audio output device 6. In the case of a broadcast format that does not require generation of partial TS data, the configurations of the first switch 12, the DEMUX unit 13, and the second switch 14 can be omitted.

The RS decoding in the demodulator / decoder 11 is an error correction process performed in packet data units of 204 bytes in which 16-byte parity data is added to 188-byte TS packets. In RS decoding, it is possible to completely correct up to 8 bytes out of 204 bytes which are packet data units. The demodulation / decoding unit 11 outputs a 188-byte TS packet in the 204-byte data after error correction. In RS decoding, when there is an error of 8 bytes or more, a signal that cannot be corrected, that is, a decoding error signal _Se is output in units of TS packets.

When a digital broadcast is received while moving, many decoding errors occur continuously or sometimes discontinuously in areas where reception is difficult. When a TS packet including a decoding error is decoded by the MPEG decoder 17, normally, normal decoding is not performed and normal image data and / or audio data is not output from the MPEG decoder 17. Therefore, when the reception state is performing mobile reception that varies, even record all TS data decoded, the TS packet was identified by the decoding error signal S _e, MPEG decoding normally decoding result also is It cannot be obtained and becomes useless data. As described above, recording a TS packet including a decoding error in the storage device 24 is an operation for recording data that hardly contributes to an improvement in the quality of a reproduced image, and can be said to be an operation with low necessity.

  The TS data to be recorded in the storage device 24 may be TS data output from the demodulation / decoding unit 11 or may be partial TS data arbitrarily selected by the user in the DEMUX unit 13. The TS rate of the TS data output from the demodulation / decoding unit 11 is, for example, about 24 Mbps at the maximum in the case of current terrestrial digital broadcasting. If the terrestrial digital broadcast is a broadcast in which three programs are superimposed on TS data, one of the programs is extracted by the DEMUX unit 13 as partial TS data, and the TS rate is about 8 Mbps (= 24 Mbps / 3 programs). The switching of whether the data to be recorded in the storage device 24 is TS data or partial TS data is performed by the first to third switches 12, 14, 15, and the recording of the storage device 24 is performed according to the data to be recorded. Capacity consumption is different.

The third switch 15 selects the second switch 14 when recording partial TS data in the storage device 24, and selects the first switch 12 when recording all TS data in the storage device 24. Thus, the storage capacity of the storage device 24 is utilized as effectively as possible. The selected TS data is input to the data converter 23 together with the decoding error signal _Se or S _ed synchronized with the data. For example, when partial TS data is selected, the decoding error signal S _ed that has passed through the delay unit 16 having a delay amount equivalent to the processing delay in the DEMUX unit 13 is converted into a data conversion unit so as to correspond to the partial TS data. In the storage unit 2, the data conversion unit 23 removes TS data corresponding to the decoding error signal S _ed in units of TS packets and records the data in the storage device 24.

  When reproducing the partial TS data recorded in the storage device 24, the third switch 15 selects the second switch 14 and outputs the reproduced TS data from the storage device 24 to the second switch 14, The switch 14 outputs the input reproduction TS data to the MPEG decoder 17. When reproducing the TS data (not partial TS data) recorded in the storage device 24, the third switch 15 selects the first switch 12 and uses the first switch 12 to reproduce the reproduction TS data from the storage device 24. The first switch 12 outputs the input reproduction TS data to the MPEG decoder 17 via the DEMUX unit 13 and the second switch 14. That is, at the time of reproduction, the third switch 15 makes the same selection as when recording, and the first switch 12 or the second switch 14 selects the data from the demodulation / decoding unit 11 or the data from the storage unit 2, The selected TS data is decoded by the MPEG decoder 17.

  2A to 2D are timing charts in the case where TS data is processed and recorded in units of TS packets in the digital broadcast recording / reproducing apparatus according to Embodiment 1, and FIG. (B) shows the recorded TS data and its time information, (c) shows the playback TS data, its time information, and the state of the MPEG decoding process, (D) has shown the display state of the display apparatus.

2 (a) is received TS data includes TS packets _TS 1 _{~TS 10,} the top input time of each TS packet _TS 1 _{~TS 10 is} a T 1 _{through T 10,} TS packet TS ₄ , TS ₅ , TS ₇ corresponding to the case where the decoding error signal _Se is generated (that is, a high-level period in the waveform of the decoding error signal in FIG. 2A).

2 (b) is the data conversion unit 23 counts the leading input time _T 1 _{through T 10} TS packet _TS 1 _{~TS 10,} does not correspond to the decoded error signal _{S e} (i.e., not deleted) TS Recording packets TS ₁ , TS ₂ , TS ₅ , TS ₆ , TS _{8 to} TS ₁₀ and their leading times T ₁ , T ₂ , T ₅ , T ₆ , T _{8 to} T ₁₀ in the storage device 24. Show. By controlling in this manner, TS packets TS ₃ , TS ₄ , TS ₇ that cannot be normally used during reproduction are not recorded in the storage device 24, and the usage amount of the recording capacity of the storage device 24 can be reduced. . FIG. 2B illustrates an example in which TS packets TS ₃ , TS ₄ , TS ₇ and their time information T ₃ , T ₄ , T ₇ are not recorded in the TS data. Normally, TS packets that are not recorded and their time information are different TS packets from the illustrated example.

During reproduction, a control unit (not shown) controls the storage device 24 so as to output the corresponding TS packet with reference to the recorded time information. For example, the control unit outputs the TS packet TS ₁ immediately after reading the time information T ₁ first, and then outputs the TS packet TS ₂ immediately after reading the time information T ₂ . Next, the control unit, when read elaborate time information is T _5, after finishing the output of the TS packet TS ₂ is after the time TS packets are two outputs, outputs the TS packets TS ₅ Let Under such control, TS packets TS ₃ and TS ₄ are not recorded in the storage device 24, but during reproduction, the TS packet TS ₅ is recorded on the time axis (before the TS packets TS ₃ and TS ₄ are deleted). Therefore, the data rate at the time of recording (before TS packet deletion) and the reproduction rate can be made the same.

In FIG. 2C, the portion of the TS packet indicated by the broken line of the reproduced TS data is not reproduced, and the portion between the TS packets TS ₂ and TS ₅ before and after the broken line portion indicated by the broken line portion. In the discontinuous period, data continuity is lost. In MPEG, if data continuity is lost, it is necessary to re-decode the data immediately after the lost continuity, so if there is a discontinuous period, re-decode as soon as possible. It is necessary to start processing and return to the normal decoding state as soon as possible. For example, in FIG. 2 (c), when is loaded time information of the start input time T ₅ is found to be immediately can not be output data, immediately standby to perform a discontinuous process of the MPEG decoder 17 During standby, the last normal screen (the screen of TS packet TS ₂ in FIG. 2C) is displayed as a still image, and a standby period for discontinuous processing in the MPEG decoder 17, and The uncomfortable feeling that the user learns by the display screen of the display device 5 during the period until the return to the normal decoding state is reduced as much as possible.

As described above, in the first embodiment, with reference to the decoded error signal S _e or delayed decoded error signal S _ed is outputted from the demodulation / decoding unit 11, on the input TS data, TS packet units Thus, whether or not to record in the storage device 24 is determined in units of TS packets, and time information is added to the TS packets to be recorded and recorded in the storage device 24. For this reason, in the digital broadcast recording / reproducing apparatus according to Embodiment 1, when the reception state deteriorates due to movement and an error that cannot be corrected by the demodulation / decoding unit 11 occurs, the decoding error signals S _e and S _ed Since normal video cannot be reproduced even if the corresponding TS packet is recorded / reproduced, only the TS packet corresponding to the decoding error signals S _e and S _ed is deleted, and only the TS packet in which no error has occurred is displayed together with the time information. It is configured to record in the storage device 24. Therefore, the digital broadcast recording / reproducing apparatus according to Embodiment 1 can reduce the use of useless recording capacity in the storage device 24, and can select a storage device having a small storage capacity.

  Further, at the time of reproduction, the data rate at the time of recording is reproduced based on the time information recorded in the storage device 24, and before the next normal TS packet is input in the deleted TS packet part (discontinuous part). In addition, the MPEG decoder 17 is set in a standby state so that discontinuous processing can be performed immediately, so that decoding processing can be performed as soon as possible when a normal TS packet is input. In addition, since the last normal decoded still image is displayed until normal decoding can be restored, it is possible to reduce the user's uncomfortable feeling due to the abnormal decoding screen or abnormal audio that occurs in the discontinuous period. .

Embodiment 2. FIG.
In the first embodiment, the case where data is processed in units of TS packets when a decoding error signal occurs has been described. However, when a decoding error signal occurs, TS data is converted into an image decoding data unit or audio. You may comprise so that data may be processed in the data unit for a decoding. The image decoding data unit is, for example, a GOP (Group Of Picture) unit, and the audio decoding data unit is, for example, an AAU (Audio Access Unit) unit. Note that FIG. 1 is also referred to in the description of the second embodiment.

FIGS. 3A to 3D are timing charts in the case where TS data is processed and recorded in units of GOPs in the digital broadcast recording / reproducing apparatus according to Embodiment 2, and FIG. 3A shows received GOP data. , Decoding error signal, TS data in GOP data, time information thereof, and decoding error signal drawn in units of TS packets, (b) shows recorded TS data and time information thereof, (c), The reproduction GOP data and MPEG decoding process state in the reproduction method 1 are shown, and (d) shows the reproduction GOP data and MPEG decoding process state in the reproduction method 2. In FIGS. 3A to 3D, GOP _m indicates a GOP whose GOP number is m. 3A and 3B, TS _{m, n} indicates a TS packet with a TS number of n in GOP _m .

  GOP is an MPEG video decoding data unit, and MPEG is a system capable of decoding in GOP units. GOP includes a closed GOP that can be decoded independently and a broken GOP linked to the previous GOP. Discrimination between a closed GOP and a broken GOP is possible based on header information of the MPEG GOP layer. Usually, display data of about 0.5 seconds after decoding is grouped as 1 GOP. That is, 1 GOP is an aggregate of TS packets. The AAU is an audio decoding data unit of the MPEG1, layers 1, 2, and 3, and MPEG decoding is possible for each AAU unit.

In the example shown in FIGS. 3A to _3D , decoding is performed into TS packets TS _3,1 and TS _3,2 in GOP ₃ , as shown in the received data (enlarged) in FIG. When an error occurs, an error has occurred in the GOP, which is a video decoding data unit. Therefore, all TS packets TS _3,0 , TS _3,1 ,... Corresponding to GOP ₃ are deleted and included in the GOP having no decoding error as shown in the recorded data in FIG. Only the TS packet to be recorded is recorded in the storage device 24 with time information added.

  At the time of reproduction, an example equivalent to the reproduction operation of the first embodiment shown in FIG. 2C is shown as a reproduction method 1 in FIG. Since the reproduction operation shown in FIG. 2C is reproduction in units of TS packets, there is a possibility that the last normally decoded image cannot be correctly displayed as a still image depending on the position of the TS packet including a decoding error. On the other hand, since the reproduction method 1 shown in FIG. 3C is decoding in units of GOP, the last normally decoded image can be displayed as a still image. Therefore, it is possible to display a discontinuous portion indicated by a broken line in FIG. 3C (or a period obtained by adding a time until returning to normal decoding in the GOP to this portion) as a normal still image. Become. Although not shown in FIGS. 3A to 3D, AAU unit processing may be employed instead of GOP unit processing.

The reproduction method 2 shown in FIG. 3D is a reproduction method particularly in the case of a closed GOP. In the case of a closed GOP, each GOP has no correlation with each other and can be decoded independently. In the boundary portion between GOP ₂ and GOP ₄ or between GOP ₅ and GOP ₈ , MPEG decoding is not performed normally only for resynchronization of the MPEG decoding time axis. there is a possibility. For this reason, the image decoded at the last part of the GOP (for example, the image of the last part of GOP ₂ or the image of the last part of GOP ₅ ) may be displayed as a still image only during the resynchronization period. Compared with the reproduction method 1 shown in FIG. 3C, it is possible to shorten the time for which a still image is displayed.

  As described above, when there is a decoding error signal, the data conversion unit 23 processes the data in units of GOP or AAU, which is an MPEG decoding data unit, so that the TS described in the first embodiment is used. Compared with data processing in units of packets, the amount of recording data reduction increases, and the storage capacity of the storage device 24 can be used more effectively.

  Also, during playback, playback is performed in units of decoding data, and the display time of still images inserted before MPEG decoding becomes normal can be shortened, reducing the discomfort felt by the user during discontinuous periods of images and audio. can do.

  In the second embodiment, points other than those described above are the same as those in the first embodiment.

Embodiment 3 FIG.
In the third embodiment, the data converter 23 processes data in units of MPEG decoding data while referring to the relationship between the number of generated decoding error signals and an arbitrary threshold. 2 and different. Note that FIG. 1 is also referred to in the description of the third embodiment.

4 (a) to 4 (d) are timing charts in the case where TS data is processed and recorded in units of data for image decoding (GOP units) using threshold values in the digital broadcast recording / reproducing apparatus according to Embodiment 3. FIG. (A) shows received GOP data, decoding error signal, TS data in GOP data, its time information, and decoding error signal drawn in units of TS packets, (b) shows recorded TS data and The time information is shown, (c) shows the state of the reproduction GOP data and MPEG decoding process in the reproduction method 1, and (d) shows the state of the reproduction GOP data and MPEG decoding process in the reproduction method 2. 4A to 4D, GOP _m indicates a GOP whose GOP number is m. 4A and 4B, TS _{m, n} indicates a TS packet having a TS number n in GOP _m .

  As a result of MPEG decoding, the quality of the displayed image (or audio) varies greatly depending on how much the decoding error signal is generated in the GOP. The GOP is configured by arbitrarily grouping images (pictures), and is generally composed of about 15 images (pictures), and is an aggregate of TS packets.

Here, the number of TS packets entire GOP and _{N A,} to define any parameters _{P A} in the following equation.
P _A = N _A / 15
Also, each _{P A} packet, calculates the number _{N PA} of TS packets containing decoding error. At this time, in order to determine the quality of the MPEG playback image, the number of decoding errors in which only small block noise appears in the MPEG playback image is used as the threshold value DET. For example, setting the threshold value DET to _P A / 4. A size comparison is performed with respect to the threshold value DET for the number N _PA of packets including decoding errors calculated every arbitrary unit time. When the number N _{PA of} TS packets including a decoding error within one GOP period exceeds the threshold value DET (DET> N _PA ), the influence of the decoding error is large, affecting the entire decoded MPEG playback image, and displaying It is determined that the quality is remarkably lowered, and all TS packets in the corresponding GOP are deleted (GOP ₆ and GOP ₇ are applicable in FIGS. 4A to 4D). However, when the number N _{PA of} TS packets including decoding errors within one GOP period is less than or equal to the threshold DET (DET ≦ N _PA ), the influence of the decoding error is small, and the error of the MPEG playback image that is actually decoded will be Since only a small block noise appears in the influence, it can be judged that the degradation of quality is limited. Therefore, the corresponding GOP records all TS packets while adding time information (the decoding error is added and the decoding is added). Error information is also added) (in FIG. 4 (a) to (d), GOP ₃ corresponds).

The above example is an example in which the threshold value DET with DET = P _A / 4 is used as a criterion. For example, the condition of the threshold value DET is a number N of TS packets in which decoding errors occur in bursts and include decoding errors. _PA occurs consecutively any number N _B, with respect to the decoded MPEG playback image, conditions that may cause serious quality drops image of a portion is also conceivable.

During reproduction, reproduction methods 1 and 2 shown in FIGS. 4C and 4D can be executed. 4 (c) and 4 (d) show playback methods corresponding to FIGS. 3 (c) and 3 (d), respectively. The number of TS packets containing decoding errors N When the GOP containing TS packets with error information recorded when the _PA is equal to or less than the threshold value DET is reproduced in MPEG, the decoding error is displayed when the corresponding image is displayed. It is possible to present the cause of the occurrence of noise or the like in the reproduced image to the user.

  As described above, the number of accumulated decoding errors per arbitrary unit period and an arbitrary threshold are determined, and when the accumulated decoding error number is larger than the threshold, all TS packets in the GOP are removed, and the threshold is In the following cases, error information is also added and recorded, so that the allowable amount of degradation in the quality of the MPEG playback image can be arbitrarily set, and when the recorded data is played back in MPEG, the allowable range of the playback image quality of the user It is possible to view within.

  Also, based on the result of the judgment of the size of the total number of decoding errors per arbitrary unit period and the arbitrary threshold value, the result of determining whether the cause of noise in the reproduced image is the effect of mobile reception is It is also possible to display, and the user can determine whether the cause of noise in the reproduced image is a failure of the reproduction unit of the device or the influence of mobile reception.

Next, when the MPEG decoder 17 is decoding both the image and the sound, or only the image, or only the sound, the data conversion unit 23 changes the value of the threshold value DET according to the decoded content of the MPEG decoder 17 and inputs it. An example in which data is processed in units of MPEG decoding data will be described with reference to the relationship between the number of generated decoding error signals and the threshold number. In general, it is considered that visual perception can recognize differences more sensitively. For this reason, when the MPEG decoder 17 is decoding both the image and the sound, the data conversion unit 23 uses the relationship between the threshold DET for the image and the number N _PA of TS packets including a decoding error, and uses the MPEG decoding data. Data is processed in units, and processed data is recorded in the storage device 24. On the other hand, when the MPEG decoder 17 decodes only the sound, it recognizes inferior to visual sense. Therefore, the relationship between the threshold DET for sound and the number N _PA of TS packets including a decoding error is more compared with the image. Even when there are many decoding errors, it can be determined that recording is possible.

As described above, the threshold value DET has an arbitrary number of values and can be selected from an arbitrary number according to the decoding content of the MPEG decoder 17. Therefore, the most appropriate value can be selected regardless of the decoding content of the MPEG decoder 17. Since the data can be processed in relation to the threshold value DET and the number N _PA of TS packets including a decoding error, it is possible to automatically control the recording data amount to an optimum amount no matter what digital broadcast is received.

  In the third embodiment, points other than those described above are the same as those in the first or second embodiment.

Embodiment 4 FIG.
In the first to third embodiments, the case has been described in which data having a poor digital broadcast reception state is not recorded in the storage device 24. On the other hand, in the fourth embodiment, in addition to digital broadcasting, analog broadcasting is received, and a portion (error period) in which analog broadcasting is not received is deleted to reduce the amount of recording capacity used in the storage device 24. is doing.

FIG. 5 is a block diagram showing a configuration of a digital broadcast recording / reproducing apparatus according to Embodiment 4 of the present invention. In FIG. 5, the same or corresponding components as those in FIG. As shown in FIG. 5, the digital broadcast recording / reproducing apparatus according to the fourth embodiment includes a digital broadcast receiving unit 1, a storage unit 2, and an analog broadcast receiving unit 3 that receives FM / AM audio analog broadcast, for example. have. The analog broadcast receiving unit 3 demodulates the received analog broadcast and the second antenna 30 that receives the analog broadcast, and generates a demodulation error signal _Sae when there is a portion where the demodulation could not be performed normally. Is output from the audio codec unit 32, the audio codec unit 32 that can encode / decode arbitrary data from the input demodulation error signal and digital signal And a D / A converter 33 for converting the digital data into an analog signal and outputting the analog signal. The storage unit 2 includes a fourth switch 25. The fourth switch 25 can switch digital broadcast reception data and analog broadcast reception data in a time division manner.

6 (a) and 6 (b) are timing charts in the case where a digital broadcast recording / playback apparatus according to Embodiment 4 processes and records a broadcast signal in units of audio decoding data using a threshold. a) shows demodulated digital data, demodulated error signal, demodulated digital data after processing, and digital data after encoding when data is processed and recorded in units of audio decoding data using a threshold; (b) These show the playback data and the state of the decoding process when playing back data recorded after data processing in units of audio decoding data. 6A and 6B, AD _x indicates a voice decoding data packet whose packet number is x. Further, in FIG. 6A, AUT _x indicates speech decoding data after encoding whose unit number is x.

Next, the operation of the digital broadcast recording / reproducing apparatus according to Embodiment 4 will be described. The analog broadcast received by the second antenna 30 is demodulated by the demodulator 31 and converted into analog data, which is then converted into digital data and output. At the time of demodulation, if a period that is not normally demodulated occurs, a demodulation error signal _Sae is also generated at the same time, and is output to the subsequent audio codec unit 32 in synchronization with the digital data.

Any period as the _{T ana,} a demodulation error occurrence period and _{T err,} when the arbitrary threshold and _{DET ana,} the demodulation error occurrence period _{T err} during any period of time _{T ana,} greater than any threshold _{DET ana} Depending on whether or not, the audio encoding method in the audio codec unit 32 is changed. When the demodulation error occurrence period T _err is equal to or less than the threshold value DET _ana (DET _ana ≦ T _err ), the demodulated data corresponding to the demodulation error signal is decoded by the audio codec unit 32 (AUT _x in FIG. 6). ). On the other hand, when the demodulation error occurrence period T _err is larger than the threshold value DET _ana (DET _ana > T _err ), the influence on the decoded speech unit (AUT _x in FIG. 6) encoded by the speech codec unit 32 is large (that is, , It is determined that abnormal sound becomes dominant when decoding at the time of reproduction).

As shown in FIGS. 6A and 6B, the data packet AD ₂ which is a data unit for speech decoding corresponds to the case where DET _ana > T _err , and the data packet AD ₃ has a demodulation error. Since this corresponds to the case of DET _ana ≦ T _err , the speech codec unit 32 converts only the data packet AD ₂ that is a speech decoding data unit into silence data, encodes it into the speech decoding data unit, and after encoding The encoded data of decoded speech units AUT _{1 to} AUT ₄ is output. In the encoding of the decoded speech unit AUT ₃ , the data packet that is the immediately preceding speech decoding data unit is encoded as silence, or the data packet that is the immediately preceding speech decoding data unit is encoded as AUT ₁ Choose one of them. That is, as a criterion for selection, when the encoded data is decoded to be analog voice, the one with less sense of incongruity between voices is selected. The encoded decoded speech unit data is output to the fourth switch 25 with time information and error information added in decoded speech units.

  The fourth switch 25 selects the data from the digital broadcast receiving unit 1 and the data from the audio codec unit 32 in a time-sharing manner, and when the selected data is data from the digital broadcast receiving unit 1, The data conversion unit 23 performs predetermined data processing, and when the selected data is data from the audio codec unit 32, the data conversion unit 23 simply passes through without processing the data and stores it in the storage device 24. To be recorded.

  At the time of reproduction, when the reproduction data from the storage device 24 is digital broadcast reception data, the data conversion unit 23 performs predetermined processing and outputs the data to the digital broadcast reception unit 1 via the fourth switch 26. . When reproducing analog audio reception data, as in the first embodiment, the data converter 23 uses the recorded time information and reproduces the recording rate while recording the error. Information is also extracted. Since the extracted error information is information including a part that becomes noise when speech decoding is performed, the extracted error information is output to the display device 5 or a device that can be visually presented to the user, and is visually decoded. It is shown to the user that the cause of the noise is a demodulation error caused by mobile reception.

  The reproduction analog audio reception data is input to the audio codec unit 32 through the fourth switch 25, and the audio digital data subjected to audio decoding is converted into an analog output by the D / A converter 33 and output to the audio output device 6. .

  As described above, even when analog audio is received, the amount of data to be encoded is optimally controlled by the demodulation error signal, and the data from the digital broadcast receiver 1 and the data from the analog broadcast receiver 3 are time-shared. Because it can be selected by switching to, the encoded (compressed) data from both receiving systems can be recorded in the storage device in a time-sharing manner, and the amount of recorded data can be optimally controlled, so with a small storage capacity, At the same time, both digital and analog broadcasts can be recorded / reproduced.

  In addition, when analog audio reception data is reproduced, the demodulation error signal added at the time of recording is extracted and displayed. If there is noise in the reproduced audio, the user is informed that the cause is a demodulation error caused by mobile reception. By adopting the configuration presented in the above, the user can immediately determine that the cause of noise is not a device failure but a reception demodulation error.

  In the fourth embodiment, points other than those described above are the same as in any of the first to third embodiments.

Embodiment 5. FIG.
In Embodiment 4 above, even when an analog broadcast is received, the recorded data is optimally controlled while referring to the demodulation error signal, and both the digital broadcast received data and the analog broadcast received data are recorded in a time-sharing manner, Digital broadcast reception data and analog broadcast reception data can be reproduced. On the other hand, in Embodiment 5, in addition to digital broadcast reception data and analog broadcast reception data, it is possible to record mobile phone call data, which is optimal according to the reception error signal of the mobile phone call data. A mode in which digital broadcast reception data, analog broadcast reception data, and mobile phone call data can be recorded while being controlled will be described.

  FIG. 7 is a block diagram showing a configuration of a digital broadcast recording / reproducing apparatus according to Embodiment 5 of the present invention. In FIG. 7, the same or corresponding components as those in FIG. As shown in FIG. 7, the digital broadcast recording / reproducing apparatus according to the fifth embodiment includes a digital broadcast receiving unit 1, a storage unit 2, an analog broadcast receiving unit 3, and a hands-free call unit 4. Yes. The digital broadcast recording / reproducing apparatus according to Embodiment 5 is, for example, a mobile phone. By using the hands-free calling unit 4, the user can make a call while holding the mobile phone without directly holding the mobile phone. The hands-free call unit 4 is a hands-free device that can convert a microphone 40 that can input voice, voice from a mobile phone, voice input from a microphone into digital data, and can generate a reception error signal. Conversion unit 41, audio codec unit 42 that can process audio digital data with reference to a reception error signal and perform audio encoding / decoding, and D / A conversion unit that converts the digital audio signal into an analog audio signal 43. The storage unit 2 includes a fifth switch 26, which can switch digital broadcast reception data, analog broadcast reception data, and data from the hands-free call unit 4 in a time division manner.

Next, the operation of the digital broadcast recording / reproducing apparatus according to Embodiment 5 will be described. Data received by the mobile phone and audio data input by the microphone 40 are input to the hands-free conversion unit 41 and converted into digital audio data. Also, the hands-free conversion unit 41 may enter a reception sensitivity signal indicative of the reception sensitivity of the mobile telephone, when this signal indicates poor sensitivity, it is possible to generate a reception error signal S _he, from the microphone 40 audio input, or voice input from the cellular phone (call voice) can also generate a reception error signal S _he if no arbitrary time.

Generated from the hands-free conversion unit 41, a reception error signal S _he a digital audio data input to the voice codec unit 42 performs the same processing as in FIG. 6 described in Embodiment 4, optimally the call voice data amount While controlling, voice encoding (compression) is performed.

  The fifth switch 26 selects data from the digital broadcast receiving unit 1, data from the analog broadcast receiving unit 3, and data from the audio codec unit 42 in a time division manner, and the selected data is received by the digital broadcast. In the case of the data from the unit 1, the data conversion unit 23 performs predetermined data processing, and when the selected data is the data from the analog broadcast receiving unit 3 or the data from the audio codec unit 42 The data conversion unit 23 records the data in the storage device 24 only by passing the data without processing.

  At the time of reproduction, when the reproduction data from the storage device 24 is digital broadcast reception data, the data conversion unit 23 performs predetermined processing and outputs the data to the digital broadcast reception unit 1 via the fifth switch 26. When the reproduction data from the storage device 24 is call voice data, the same processing as that of the analog voice reception data described in the fourth embodiment is performed, and when error information is extracted, the display device 5 or The information is output to a device that can be visually presented to the user, and the display content indicating that the cause of noise during speech decoding is a demodulation error that occurs due to mobile reception is presented to the user.

  The reproduction analog audio reception data is input to the audio codec unit 42 through the fifth switch 26, and the audio digital data subjected to audio decoding is converted into an analog output by the D / A converter 43 and output to the audio output device 6. .

  As described above, in the hands-free call unit 4, the call voice also receives data from the digital broadcast receiver 1 and data from the analog broadcast receiver 3 while optimally controlling the amount of data to be encoded by the reception error signal. And the data from the hands-free converter 4 can be selected by switching to time division, so that encoded (compressed) data from the three systems can be recorded in the storage device 24 in time division, and Since the amount of recording data of each system can be optimally controlled, both digital / analog broadcasting and call voice can be recorded / reproduced simultaneously with a small storage capacity.

  Also, by extracting and displaying the reception error signal added during recording during call voice data playback, if there is noise in the playback voice, the cause is a reception error caused by mobile reception. Since it can be presented, the user can immediately determine that the cause of the noise is not an equipment failure but an error due to mobile reception.

  In the fifth embodiment, points other than those described above are the same as in any of the first to fourth embodiments.

  The digital broadcast recording / reproducing apparatus described above is particularly suitable for receiving broadcast waves by a mobile object. For example, the broadcast waves can be received in an area where it is difficult to stably receive broadcast waves. It is also suitable for reception.

It is a block diagram which shows the structure of the digital broadcast recording / reproducing apparatus which concerns on Embodiment 1 thru | or 3 of this invention. (A) to (d) are timing charts when TS data is processed and recorded in units of TS packets in the digital broadcast recording / reproducing apparatus according to Embodiment 1, and (a) is received TS data, The time information and the decoding error signal are shown, (b) shows the recorded TS data and the time information, (c) shows the reproduction TS data, the time information, and the state of the MPEG decoding process, (d ) Indicates the display state of the display device. (A) thru | or (d) is a timing chart in the case of processing and recording TS data by the data unit for image decoding (GOP unit) in the digital broadcast recording / reproducing apparatus which concerns on Embodiment 2, (a). Indicates received GOP data, decoding error signal, TS data in GOP data, its time information, and decoding error signal drawn in units of TS packets, (b) shows recorded TS data and its time information, (C) shows the state of the reproduction GOP data and MPEG decoding process in the reproduction method 1, and (d) shows the state of the reproduction GOP data and MPEG decoding process in the reproduction method 2. (A) thru | or (d) are timing charts in the case where TS data is processed and recorded in data decoding data units (GOP units) using threshold values in the digital broadcast recording / reproducing apparatus according to Embodiment 3. (A) shows received GOP data, decoding error signal, TS data in GOP data, time information thereof, and decoding error signal drawn in units of TS packets, and (b) shows recorded TS data and time thereof. (C) shows the state of the reproduction GOP data and MPEG decoding process in the reproduction method 1, and (d) shows the state of the reproduction GOP data and MPEG decoding process in the reproduction method 2. It is a block diagram which shows the structure of the digital broadcast recording / reproducing apparatus which concerns on Embodiment 4 of this invention. (A) And (b) is a timing chart when the digital broadcast recording and reproducing apparatus according to Embodiment 4 processes and records a broadcast signal in units of audio decoding data using a threshold. Indicates demodulated digital data, demodulated error signal, demodulated digital data after processing, and digital data after encoding when data is processed and recorded in units of audio decoding data using a threshold, and (b) is: The reproduction data and the state of decoding processing in the case of reproducing data recorded by processing data in units of audio decoding data are shown. It is a block diagram which shows the structure of the digital broadcast recording / reproducing apparatus which concerns on Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital broadcast receiving part, 2 Storage | storage part, 3 Analog broadcast receiving part, 4 Hands-free call part, 5 Display apparatus, 6 Audio | voice output apparatus, 10 Antenna (1st antenna), 11 Demodulation / decoding part, 12 1st switch, 13 Demultiplexer section (DEMUX section), 14 Second switch, 15 Third switch, 16 Delay section, 17 MPEG decoder, 18 D / A conversion section, 19 D / A conversion section, 23 Data conversion section, 24 Storage device, 25 4th switch, 26 5th switch, 30 2nd antenna, 31 demodulator, 32 audio codec, 33 D / A converter, 40 microphone, 41 hands-free converter, 42 audio codec, 43 D / A converter .

Claims (10)

Demodulation that generates transport stream data by demodulating / decoding a digital broadcast signal, and generating a decoding error signal indicating a transport stream packet including a decoding error in the transport stream packet constituting the transport stream data / Decoding part,
At the time of data recording, the transport stream data is processed in units of transport stream packets, video decoding data units, or audio decoding data units based on the decoding error signal, and the processed transport stream data and the transport stream data are processed. The time information of the transport stream packet constituting the port stream data is recorded in the storage device, and when the data is reproduced, the processed transformer is processed from the storage device while referring to the time information recorded in the storage device. A digital broadcast recording / reproducing apparatus, comprising: a data converter that reproduces port stream data and executes arbitrary discontinuous processing in a discontinuous period generated in the processed transport stream data.   The processing of the transport stream data includes deletion of any data unit of a transport stream packet including a decoding error in the transport stream data, video decoding data, and audio decoding data. The digital broadcast recording / reproducing apparatus according to claim 1.   The processing of the transport stream data includes deletion of a video decoding data unit or an audio decoding data unit in a portion where the number of the decoding error signals of the transport stream data is greater than or equal to a predetermined threshold. The digital broadcast recording / reproducing apparatus according to claim 1.   The processing of the transport stream data includes adding error information in units of transport stream packets where the number of decoding error signals of the transport stream data is less than a predetermined threshold, and storing the error information in the storage device. The digital broadcast recording / reproducing apparatus according to claim 3, further comprising a recording.   The digital broadcast recording / reproducing apparatus according to claim 4, wherein the threshold value is adjustable. The video decoding data unit is a GOP unit,
The digital broadcast recording / reproducing apparatus according to claim 1, wherein the audio decoding data unit is an AAU unit.   7. The digital broadcasting according to claim 1, wherein the discontinuous processing at the time of data reproduction includes display of a still image of a video immediately before the discontinuous period or an image prepared in advance. Recording / playback device.   The discontinuous processing at the time of data reproduction includes processing for starting display of an image immediately after the discontinuous period immediately after display of an image immediately before the discontinuous period is finished. The digital broadcast recording / reproducing apparatus according to any one of 1 to 6. It further has an analog broadcast receiver for receiving an analog broadcast signal,
The analog broadcast receiving unit digitizes the demodulated demodulated signal of the analog broadcast signal, and has a demodulating unit that generates a demodulation error signal indicating the detection status to the outside,
The data conversion unit processes the analog broadcast data in units of audio decoding data based on the demodulation error signal at the time of recording the analog broadcast data, and processes the processed analog broadcast data and time information of the audio decoding data unit. The recorded analog broadcast data is played back from the storage device while being recorded in the storage device and referring to the time information when the analog broadcast data is played back. The digital broadcast recording / reproducing apparatus described. The telephone further has a mobile phone function,
The call unit includes a call signal conversion unit that digitizes a voice signal and generates a reception error signal related to the voice signal.
The data conversion unit processes audio data in units of audio decoding data based on the reception error signal when recording audio data, and stores the processed audio data and time information in units of audio decoding data in the storage device The digital broadcast recording according to claim 1, wherein the processed audio data is reproduced from the storage device while referring to the time information when the audio data is reproduced. Playback device.

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