JP2001197024A - Data transmission / reception method and data transmission / reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transmission and reception device equipped with a mechanism for changing receiver operation by areas for a digital broadcast which possibly provide services different by areas. SOLUTION: Area identification information for identifying specific areas is multiplexed with data of digital broadcasts sent out from a transmission side by the specific areas. On reception sides, data processing programs for processing data different by the areas are stored before the broadcast is received and relation information relating the area identification information to the 1st storage area is stored; when the broadcast is received, the area identification information is extracted from the received data and the processing program of the area corresponding to the area identification information is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission / reception method and a data transmission / reception system, and more particularly, to a terrestrial digital broadcasting in which a different service is likely to be provided in each region, where the receiver side has a different service in each region. And a device that provides a configuration that can easily receive the same.

[0002]

2. Description of the Related Art Satellite digital broadcasting and terrestrial digital broadcasting services have been started in the United States, Europe and Japan since the late 1990s. Digital broadcasting offers new services such as electronic program guides (EPGs),
CA (Conditional Acces) for scrambled broadcasting
s) There is a feature that a system is used. The data on which the electronic program guide is based is the program arrangement information (Service
Information) and multiplexed with the MPEG2 transport stream for transmission. In addition, regarding the structure of the MPEG2 transport stream,
Since it is described in the system standard (ISO / IEC13818-1), the description is omitted here.

[0003] Program arrangement information is based on the DVB standard (E) in Europe.
TS300 468) and in Japan the ARIB standard (ARIB STD-B10). Further, different CA systems are introduced by broadcasters.

FIG. 10 shows a general configuration of a digital broadcast receiver used for these services, and its operation will be described. The digital broadcast radio wave is received by the antenna 1 and detected and demodulated by the tuner 2, demodulator 3, and error correction unit 4 at the subsequent stage to reproduce the MPEG transport stream.

[0005] Next, video packets and audio packets of the channel (service) selected by the user are extracted by the transport decoder 5, and the respective packets are decoded by the video decoder 6 and the audio decoder 7. The digital signal is converted into an analog signal by the unit 8 and the second digital-to-analog converting unit 9, an image is output to the display 10, and audio is output to the speaker 11.

[0006] The program memory 12 stores a control program for controlling the operation of the receiver. Control unit 1
Numeral 3 controls the operation of the entire receiver, and a microprocessor corresponds thereto.

For example, when displaying an EPG on a display, a transport decoder 5 extracts a packet of program sequence information from an MPEG transport stream, and the control unit 13 receives the extracted packet. The EPG display is performed by executing the control program of the EPG stored in 10.

[0008]

The conventional data transmission / reception method and data transmission / reception system are configured as described above. For example, a satellite digital broadcast of a certain broadcasting company having a service area in Japan is provided. Thinking, E
The same service is provided nationwide, including PG.
By the way, terrestrial broadcasting in Japan is planned to be digitized in the early 2000s. In terrestrial digital broadcasting in Japan, different services may be provided for each region such as the Kinki region and the Chubu region. For example, regarding the EPG, there is a possibility that the operation method of the program arrangement information is different for each region. Along with this, on the receiver side, a mechanism for changing the receiver operation for each region (changing the reception processing software) is required in order to receive different services for each region.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a terrestrial digital broadcast in which a different service is likely to be provided for each region, and a receiver receiving a different service for each region. It is an object of the present invention to provide a data transmission / reception method and a data transmission / reception system.

[0010]

According to a first aspect of the present invention, there is provided a data transmitting / receiving method for outputting a digitized broadcast signal from a transmitting side and receiving the digitized broadcast signal at a receiving side. On the data transmission side, multiplexing the area identification information for identifying the predetermined area with the digital broadcast data transmitted from the transmission side for each predetermined area, and multiplexing the area identification information with the data, Multiplexing different information for each predetermined area.

According to a second aspect of the present invention, there is provided the data transmitting / receiving method according to the first aspect, wherein the information which differs for each predetermined area is program arrangement information for digital broadcasting.

According to a third aspect of the present invention, there is provided a data transmitting / receiving method according to the first aspect.
The area identification information for identifying the predetermined area is a network ID in digital broadcasting.

According to a fourth aspect of the present invention, in the data transmitting / receiving method according to the first aspect, the area identification information for identifying the predetermined area is a postal code or a part of a postal code. Things.

According to a fifth aspect of the present invention, there is provided the data transmitting / receiving method according to the first aspect, wherein the area identification information for identifying the predetermined area includes an area code of a telephone number or an area code of an area code. It is a part of

According to a sixth aspect of the present invention, in the data transmission / reception method according to the first aspect, the area identification information for identifying the predetermined area is an area code used in an emergency alert broadcast. Things.

A data transmitting / receiving method according to a seventh aspect of the present invention is a data transmitting / receiving method for outputting a digitized broadcast signal from a transmitting side and receiving the digitalized broadcast signal at a receiving side. Extracting area identification information for identifying an area where each program is broadcast from the data transmitted from the side, and from an area in which a processing program for each area corresponding to the area identification information is stored. And selecting and executing the predetermined data processing program corresponding to the area.

In the data transmission / reception method according to an eighth aspect of the present invention, in the data transmission / reception method according to the seventh aspect, the step of detecting the frequency having the maximum value of the electric field strength of the broadcast wave at the time of receiving the broadcast is described. The step of extracting the area identification information includes extracting the area identification information from data of a frequency having a maximum electric field intensity of the broadcast wave.

According to a ninth aspect of the present invention, there is provided a data transmitting / receiving system comprising: a transmitter for digitizing a broadcast signal and broadcasting; and a receiver for receiving the digitized broadcast signal. A data multiplexing means for multiplexing the digital broadcast data transmitted from the transmission side for each predetermined area with the area identification information for identifying the predetermined area and information different for each predetermined area; A first storage means for storing a data processing program for processing different data for each area in each area, and a second storage means for storing related information for associating the area identification information with the first storage means; Means, area identification information extracting means for extracting area identification information from the received data, and a processing program for an area corresponding to the extracted area identification information Storage area identification means for extracting storage area identification information for identifying a stored area; processing program execution means for executing a data processing program for each predetermined area based on the extracted storage area identification information; It is provided with.

According to a tenth aspect of the present invention, there is provided the data transmitting and receiving system according to the ninth aspect, wherein the receiver has the frequency having the maximum value of the electric field strength of the broadcast wave when receiving the broadcast. The area identification information extracting means extracts the area identification information from the data of the frequency having the maximum value of the electric field strength of the broadcast wave.

[0020]

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a data transmitting apparatus (data transmitting / receiving system) for realizing a data transmitting / receiving method according to Embodiment 1 of the present invention. In the figure, reference numeral 101 denotes a PSI generation unit, which generates PSI (Program Specific Information) which is information mainly necessary for channel selection among program arrangement information. Reference numeral 102 denotes an SI generation unit, which is an EPG (Electronic Program) at the receiving device in the program arrangement information.
Guide), SI (Servic
e Information). PSI is defined by the MPEG2 system standard (ISO / IEC 13818-1),
Is the DVB standard (ETS300 468) in Europe, and the ARIB standard (AR
IB-STD B10).

Reference numeral 103 denotes a video encoding unit.
After converting an analog video signal taken from a camera or a VTR into a digital signal, the video signal is encoded and compressed to generate a video packet (video PES or video ES).
An audio encoding unit 104 converts an analog audio signal into a digital audio signal, and encodes and compresses the digital audio signal to generate an audio packet (audio PES or audio ES).

Reference numeral 105 denotes a transport stream multiplexing unit, which converts the data generated by the PSI generation unit 101, the SI generation unit 102, the video encoding unit 103, and the audio encoding unit 104 into a transport packet and converts the data into a transport stream. It is multiplexed.
An error correction code adding unit 106 adds an error correction code to the transport stream. 107
Is a modulator, and OFDM is used as a modulation method in the case of terrestrial digital in Europe and Japan. Reference numeral 108 denotes a transmission antenna unit that emits a radio wave to a transmission path.

The point of the present invention lies in the internal configuration of the PSI generator 101. Next, FIG. 2 shows the internal configuration of the PSI generation unit 101. In FIG. 2, reference numeral 201 denotes an NIT generation unit, which generates an NIT (Network Information Table). Reference numeral 202 denotes a PAT generation unit, which is a PAT (Progra
m Association Table). Reference numeral 203 denotes a PMT generation unit that generates a PMT (Program Map Table).
Reference numeral 204 denotes a CAT generation unit, which is a CAT (Conditional Acc
ess Table).

In the present invention, an identification code (area code) indicating an area is stored in the PSI and transmitted. Here, for example, as shown in FIG. 3, the area code is multiplexed on the NIT. In FIG. 3, reference numeral 301 denotes an area code generation unit;
A region code is generated.

Reference numeral 302 denotes a NIT multiplexing unit which multiplexes a region code and information to be conventionally included in the NIT, and
Is generated. Conventionally, information stored in NIT is DVB standard (ETS300 468), ARIB standard (ARIB-STD).
Since it is described in detail in B10), the description is omitted here. Of course, such information may be multiplexed in a table other than SI and PSI and a packet other than SI and PSI. For example, the area code and the reception frequency list are configured as shown in FIG. 4 in a descriptor format. Assuming this descriptor is an area descriptor (area_descriptor)
Name it. The name of the descriptor is not limited to this, and another name may be used. In FIG. 4, descriptor_t
ag is the tag value (number) that uniquely indicates the regional frequency descriptor
It is sufficient to assign a tag value other than the tag value conventionally used or the tag value reserved in the standard. descript
or_length indicates the total byte length of the descriptor immediately following this field. area_code_number indicates the number (1 or more) of area codes included in this descriptor.

Area_code is an area code,
For example, telephone area code, part of area code, postal code, part of postal code, emergency broadcast of analog broadcasting (Rule 9-3, No. 5 "Region code" used in Article 138 and the Ministry of Posts and Telecommunications Notice 60, Article 405) may be used. Note that this regional descriptor does not have to be exactly the same as the data structure shown in FIG. 4 as long as the above information is included.

Next, the configuration of the receiving side used in the digital broadcast receiving and transmitting method according to the first embodiment of the present invention will be described. FIG. 5 is a block diagram showing a configuration of a data receiving device used in the data transmitting / receiving method according to the first embodiment. In the figure, reference numeral 401 denotes an interface unit with a transmission path from a transmission side. For example, in the case of terrestrial broadcasting, a Yagi antenna or the like receives radio waves. 40
Reference numeral 2 denotes a tuner unit, which performs detection here. Reference numeral 403 denotes a digital demodulation unit that demodulates OFDM modulated data in the case of terrestrial digital broadcasting scheduled to be broadcast in Japan, for example. An error correction unit 404 performs error correction and outputs a transport packet. A stream separation unit 405 extracts predetermined video packets, audio packets, and other control information from the MPEG2 transport stream. 406
Is an area code extraction unit for extracting an area code from the NIT. A control unit 407 controls the operation of the entire receiving apparatus. A program memory 408 stores a program for controlling the operation of the receiving device.

FIG. 6 shows an example of how the program memory 408 is used. The program memory is broadly divided into an area common area (address 0) and an area individual area (address 1). The above-mentioned regional common areas include:
A program that performs common processing in each region is stored. For example, an initialization program, an initial reception program, a storage area identification program, and the like for the receiving device. on the other hand,
Different programs (region-specific processing programs) in each region are stored in the region-specific regions. That is, address 1 is stored as a program for region 1, and address 2 is stored as a program for region 2.
Examples of the program for each region include a program for processing program arrangement information, a program for performing CA (Conditional Access) processing, and the like.

The relationship between the area code and the area-specific processing program storage area (memory address) is stored in a table in advance, and the storage area identification program is a program for determining the start address of the storage area from the received area code. I do.

Reference numeral 409 denotes a video decoding unit for expanding and decoding the compressed video data.
Reference numeral 410 denotes a video synthesizing unit which decodes the decoded video data and EP
This synthesizes OSD (On Screen Display) data such as G. Reference numeral 411 denotes a first digital-to-analog conversion unit that converts the decoded digital video data into an analog video signal (composite signal or component signal).
Is converted to An image display unit 412 is, for example, a CRT, a liquid crystal display, a PDP, or the like.
An audio decoding unit 413 decompresses and decodes the compressed audio data. A second digital-to-analog converter 414 converts the decoded digital audio data into an analog audio signal. 415
Is an audio output unit, for example, a speaker.

The operation of the data transmitting / receiving apparatus using the data transmitting / receiving method according to the first embodiment configured as described above will be described below. FIG. 7 illustrates a processing flow of the receiving method according to the first embodiment. In FIG. 7, in step S1, the control unit 407 executes an initialization program stored in the program memory. Then
In step S2, the antenna unit 401 receives a radio wave,
The signal is demodulated by the tuner unit 402 and the digital demodulation unit 403, the error is corrected by the error correction unit 404, and the transport stream is reproduced. Then, from the reproduced transport stream, the stream separation unit 405 uses the NIT (Ne
Twork Information Table) is extracted and the control unit 407
Receives the NIT once (step S3). Next, in step S4, the area code extraction unit 406
An area code (area_code) is extracted from the IT, and the extracted area code is passed to the control unit 407. The control unit 407 executes the storage area identification program, and causes the program execution address (program counter) to jump to the start address of the area-specific processing program area corresponding to the area code extracted in step S4 (step S5). Further, in step S6, the control unit 407 executes a region-specific processing program corresponding to the region code.

The above-mentioned processing program for each area is, for example,
The program is a processing program of program arrangement information (SI: Service Information) or a processing program of CA (Conditional Access). However, other processing programs may be used.

As described above, according to the present embodiment, on the transmitting side, the area code is multiplexed into the PSI NIT,
On the receiving side, the control unit 407 performs NIT processing by the stream separation unit 405 from the reproduced transport stream.
(Network Information Table) is extracted and the control unit 40
7, the NIT is once received, the area code extraction unit 406 extracts the area code (area_code) from the NIT, and sets the program execution address (program counter) to the top address of the area-specific processing program area corresponding to the extracted area code. In the terrestrial digital broadcasting where it is highly likely that different services will be provided for each region, the receiver side will execute different services for each region. A data transmission / reception method and a data transmission / reception system that can receive data can be realized.

(Embodiment 2) Next, a digital broadcast transmitting / receiving method and a digital broadcast receiving apparatus according to Embodiment 2 of the present invention will be described. Digital terrestrial digital broadcasting in Japan will provide services in each region such as Kinki and Chubu, but near the border, for example, in Mie and Shiga prefectures, broadcast waves in the Kinki region and those in the Chubu region It is expected that broadcast waves will be mixed. At that time, it is necessary for the receiving side to accurately determine which local processing program should be used. Therefore, the second embodiment is characterized in that a function of detecting the maximum electric field strength of a received radio wave and extracting a local code from a radio wave having that frequency is newly added. To be more specific, the configuration on the transmitting side is the same as that of the first embodiment. Embodiment 2
FIG. 8 shows the configuration of the receiving apparatus in FIG. In FIG.
The same reference numerals as those in FIG. 5 indicate the same or corresponding parts. 50
Reference numeral 1 denotes a maximum electric field intensity detection unit, which is connected to the tuner unit 402 and the control unit 407, and detects a frequency having the maximum electric field intensity of a radio wave. Other configurations are the same as those of the first embodiment.

FIG. 9 shows a processing flow of the digital broadcast transmitting / receiving method according to the second embodiment. First, in step S11, the control unit 407 executes an initialization program stored in the program memory. Next, in step S12, the reception frequency of the tuner unit 402 is set to the control unit 4
07 sequentially switches and scans the frequency to detect the frequency having the maximum electric field strength. Then, in step S13, the radio wave of the frequency having the maximum electric field strength is received and the transport stream is reproduced. Following, step S14
Since step S17 is the same as step S3 to step S6 in the first embodiment, the description is omitted here.

As described above, according to the second embodiment, the maximum electric field intensity detection section 501 is provided on the receiving side, and the control section 407 sequentially switches the reception frequency of the tuner section 402 (frequency scan), and Detects the frequency with the strongest and receives the radio wave with the frequency with the maximum electric field strength. Therefore, even in the region where the two local radio waves are mixed, the local radio wave to be received is correctly detected, and it differs for each region. In digital terrestrial broadcasting that is likely to provide a service, it is possible to realize a data transmission / reception method and a data transmission / reception system in which a receiver side can receive a different service for each region.

In the second embodiment, the maximum electric field intensity is detected. However, a configuration may be adopted in which the maximum CN ratio is detected instead of the electric field intensity and a radio wave having the maximum CN ratio is received. Alternatively, a configuration may be adopted in which a radio wave having the maximum SN ratio is received.

[0038]

As described above, according to the present invention, on the data transmitting side, the area identification information for identifying the predetermined area is multiplexed on the digital broadcast data transmitted from the transmitting side for each predetermined area. Then, since different information is multiplexed for each predetermined area on the data in which the area identification information is multiplexed, and the data is output to the receiving side, different services may be provided for each area. In terrestrial digital broadcasting with high reception, an effect is obtained that the receiver side can easily receive a different service for each region.

Further, the receiving side sequentially switches the receiving frequency, detects the frequency having the maximum electric field strength, and receives the radio wave of the frequency having the maximum electric field strength. However, there is an effect that a local radio wave to be received in the area can be correctly detected and received.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a data transmission device that realizes a data transmission / reception method according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a detailed configuration of a PSI generating unit of a PSI generating unit included in the transmitting apparatus according to the first embodiment.

FIG. 3 is a diagram showing an internal configuration of a NIT generation unit constituting the PSI generation unit.

FIG. 4 is a diagram showing a data structure of a regional descriptor described in the NIT generation unit.

FIG. 5 is a diagram illustrating a configuration of a receiving device of the digital broadcast transmitting / receiving device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing an area allocation state in a program memory constituting the receiving device.

FIG. 7 is a diagram showing a flow of a receiving process of the data transmitting apparatus according to the first embodiment.

FIG. 8 is a diagram illustrating a configuration of a receiving device of the data transmitting / receiving device according to the second embodiment of the present invention.

FIG. 9 is a diagram showing a flow of a receiving process in the receiving apparatus according to the second embodiment.

FIG. 10 is a diagram showing a configuration of a conventional data transmission / reception device.

[Explanation of symbols]

 Reference Signs List 1 antenna 2 tuner 3 demodulator 4 error correction unit 5 transport decoder 6 video decoder 7 audio decoder 8 first digital / analog conversion unit 9 second digital / analog conversion unit 10 display 11 speaker 12 program memory 13 control unit 101 PSI generation Unit 102 SI generation unit 103 Video encoding unit 104 Audio encoding unit 105 Transport stream multiplexing unit 106 Error correction code adding unit 107 Modulation unit 108 Transmission antenna unit 201 NIT generation unit 202 PAT generation unit 203 PMT generation unit 204 CAT generation unit 301 Region Code generation unit 302 NIT multiplexing unit 401 Antenna unit 402 Tuner unit 403 Digital demodulation unit 404 Error correction unit 405 Stream separation unit 406 Local code extraction unit 407 Control Unit 408 program memory 409 video decoding unit 410 video synthesizing unit 411 first digital / analog conversion unit 412 video display unit 413 audio decoding unit 414 second digital / analog conversion unit 415 audio output unit 501 maximum electric field strength detection unit

Claims (10)

[Claims] 1. A data transmitting / receiving method for outputting a digitized broadcast signal from a transmitting side and receiving the digitalized broadcasting signal at a receiving side, wherein the transmitting side of the data transmits a digital broadcast signal for each predetermined area from the transmitting side. Multiplexing the area identification information for identifying the predetermined area to the data of the above, and multiplexing different information for each predetermined area to the data in which the area identification information is multiplexed. Data transmission / reception method. 2. The data transmission / reception method according to claim 1, wherein the information different for each predetermined area is program arrangement information in digital broadcasting. 3. The data transmitting / receiving method according to claim 1, wherein the area identification information for identifying the predetermined area is a network ID in digital broadcasting. 4. The data transmitting / receiving method according to claim 1, wherein the area identification information for identifying the predetermined area is a postal code or a part of a postal code. 5. The data transmitting / receiving method according to claim 1, wherein the area identification information for identifying the predetermined area is an area code of a telephone number or a part of an area code. 6. The data transmitting / receiving method according to claim 1, wherein the area identification information for identifying the predetermined area is an area code used in emergency alert broadcasting. 7. A data transmission / reception method for outputting a digitized broadcast signal from a transmission side and receiving the digitalized broadcast signal at a reception side, wherein each program is broadcasted from the data transmitted from the transmission side at the reception side. Extracting area identification information for identifying the area to be performed; and, from an area in which a processing program for each area corresponding to the area identification information is stored, the predetermined data processing program corresponding to the area is executed. Selecting and executing the data transmission / reception method. 8. The data transmitting / receiving method according to claim 7, further comprising a step of detecting a frequency having a maximum electric field intensity of the broadcast wave at the time of receiving the broadcast, and the step of extracting the area identification information comprises: A data transmission / reception method, wherein data is extracted from data of a frequency having a maximum value of the electric field strength of a broadcast wave. 9. A data transmission / reception system having a transmitter for digitizing a broadcast signal and broadcasting, and a receiver for receiving the digitized broadcast signal, wherein a digital signal transmitted from the transmission side to the transmitter for each predetermined area is provided. A data multiplexing means for multiplexing the broadcast data with area identification information for identifying the predetermined area and information different for each predetermined area, and a data processing program for processing the different data for each area in the receiver. A first storage means for storing each area separately, a second storage means for storing related information for associating the area identification information with the first storage means, and extracting the area identification information from the received data. Area identification information extracting means, and storage area identification information for identifying an area storing a processing program of an area corresponding to the extracted area identification information. A storage area identifying means for extracting, on the basis of the storage area identification information the extracted, data transmission and reception system is characterized in that a processing program executing means for executing a data processing program for each predetermined region. 10. The data transmission / reception system according to claim 9, wherein the receiver further comprises: frequency detection means for detecting a frequency having a maximum electric field intensity of the broadcast wave when receiving the broadcast; The data transmission / reception system, wherein the means extracts the area identification information from the data of the frequency having the maximum value of the electric field strength of the broadcast wave.