JP2000243030A - Receiving device and recording device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To efficiently perform transfer processing after receiving broadcast data. SOLUTION: Digital data to be broadcast is received by a tuner unit 2 from an antenna 1 of a receiving terminal and demodulated by a demodulation unit 3. The CPU 5 adds dummy data to the format of the received data when recording the data on the recording device 6 or transferring the data to another recording device via the D_I / F 7 so as to approximate the format for recording. Data transfer can be performed efficiently while maintaining the reliability of broadcast data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a receiving apparatus for receiving and recording broadcast digital data and a recording apparatus.

[0002]

2. Description of the Related Art Conventionally, transmission systems of digital radio broadcasting such as digital satellite broadcasting and FM teletext broadcasting, or digital cable broadcasting such as digital cable TV broadcasting use transmission formats defined by respective standards. , Data transmission. In addition, mini-disc, digital audio tape, compact disc, digital video disc (hereinafter referred to as “MD”, “DAT”,
Transmission of data related to a digital recording medium such as “CD” or “DVD”) or a digital data recording device such as a semiconductor storage device is also performed according to a predetermined transmission format. That is, in the transmission of digital audio data, transmission is performed from a CD to an MD and from a DAT to an MD in a format defined by a standard such as a digital audio interface.

For example, in the case of FM text multiplex broadcasting, audio data such as music data is transmitted as main data as an analog signal modulated by FM, and character data such as a song name or an artist name is multiplexed and transmitted as a digital signal. Is done. In the FM teletext receiver, the main data is
The music data is demodulated by a demodulation circuit, and the music data is output from a speaker or the like and acoustically reproduced. On the other hand, the multiplexed digital signal is extracted from the received signal together with the clock signal by the multiplexed signal demodulation circuit, and after error determination by the error correction / error detection circuit, is subjected to data processing as program data, and is displayed as display data of the receiver. Output to the display device.

[0004] Such an FM text multiplex broadcast program is called MD
When recording on a digital recording medium such as music data, audio data such as music data, which is main data, converts an analog signal after FM demodulation into analog / digital (hereinafter, “A / D”) in the same manner as a normal line input. The data is converted into digital data by performing conversion, subjected to digital compression processing used in the MD, and recorded on the MD in a recording format for the MD. The multiplexed character data is obtained by extracting data to be recorded on the MD from the program data processed as described above,
Further, the data is converted into a recording format for MD, and a text-of-contents area for MD user (hereinafter referred to as “UTO
C ").

[0005] In the case of digital satellite broadcasting, main data and character data, which are audio data such as music data, are transmitted as digital signals having a dedicated format. In a digital satellite broadcast receiver, audio data such as music data, which is main data, is extracted from a digital signal demodulated by a demodulation circuit from a received signal, and converted into an analog signal by digital / analog (hereinafter abbreviated as “D / A”) conversion. The signal is converted to a signal, and sound is output from a speaker or the like. On the other hand, character data is extracted from a digital signal demodulated by a demodulation circuit, subjected to data processing as program data, and displayed as display data on a display device of a receiver.

[0006] Such a digital satellite broadcast program is called an MD.
In the case of recording on a digital recording medium such as the above, audio data such as music data which is main data is extracted as described above,
Apply the digital compression process used in MD
On the MD in the recording format for The multiplexed character data extracts data to be recorded in the MD from the program data processed as described above, converts the data into a recording format for the MD, and stores the converted data in the UTOC of the MD.

Further, with respect to digital data transfer from a CD to an MD or from an MD to a CD using the digital audio interface standard, audio data such as music data as main data and sub data are transmitted in a predetermined transmission format. Control information such as certain copyright information and character information such as a song title are transmitted.

[0008]

In the prior art described above, for example, music data broadcast in a music program such as FM text multiplex broadcasting and digital satellite broadcasting is received and reproduced by a receiving receiver. In the case of transmission for the purpose of temporarily recording data on a recording medium, no consideration is given to a recording data format for recording on a package medium which is a digital recording medium such as a CD, MD, or DAT or a dedicated recording device. In such a case, when information related to the music data is transmitted in the sub-data while the music program is being transmitted in the main data, for example, text data such as the song name or artist name of the music data being transmitted is transmitted, This is a case in which information that is decoded and displayed on a device or decoded for display is recorded on a package medium or the like for the purpose of temporarily recording.

[0009] Such information intended for temporary recording is:
The data is transmitted after being converted into a predetermined format for each transmission method. The transmission format is usually configured in block units that may be expressed in packet units. The block includes a synchronization code, information data, and parity bits for error correction / error detection. The information data includes data management / control data and main body data. The digital data as the above-mentioned sub data is allocated to the main data of the information data. At this time, processing such as division may be performed on the digital data in order to match the data size of the main data for each block. It should be noted that the format of the block is determined specifically for each transmission scheme, and usually each has a different format. When data is received, the receiver decodes the sub data from the received data and records the sub data on a package medium or the like in cooperation with the main data. At this time, the decoded sub-data is data to be displayed on the display device or the like of the receiver as described above, and is not in a format for recording on each package medium or the like. Is recorded, editing processing such as data processing is performed so as to conform to the recording format. The editing process is performed by a receiver or a recording device. The details and method of processing follow the specifications of the receiver or the recording device.

When the sub data thus recorded is transferred to another package medium or the like, the sub data is transmitted using a method defined by a standard such as a digital audio interface. Also in this case, the sub data is transmitted in packet units. However, the recorded sub-data does not have information for error detection which is used at the time of data transfer of a recording device tube such as a package medium. It is necessary to perform error detection by generating and adding the data and transfer the data, or transfer without performing error detection without adding data for error detection.

On the other hand, in the case where music distribution is performed by digital satellite broadcasting or the like for the purpose of recording on a recording device such as a package medium which is a digital recording medium such as a CD, MD, DAT, etc. It is necessary to support the recording data format. For example, to record on package media,
When transmitting music data such as audio data and digital data which is information related to the music data such as text data such as the song name and artist name of the music data being transmitted, the transmitted music data and related information are After recording on the package medium, it is necessary to transmit the data with a data content adapted to the recording format on the package medium in consideration of a case where the data is further transferred between the package media for copying or the like. Also in the transmission between package media, data transfer is performed in block units, and when performing data transfer with error detection,
Parity information for error detection at the time of data transfer between the package media is added for each block. Therefore, at the time of transmission of music data in digital satellite broadcasting or the like, transmission error detection information for transmission between package media such as the parity is transmitted, or when not transmitted at the time of transmission, the receiver side generates the error detection information. It needs to be added.

However, when the error detection information is incorporated in transmission data such as digital satellite broadcasting in advance and transmitted, the package medium is not directly related to the primary purpose of recording music information on the package medium. There is a problem that the transmission efficiency of broadcast is reduced due to the secondary purpose of data transfer between the two. In addition, when the error detection information is generated and added on the receiver side, there is a problem that the processing efficiency on the receiver side decreases.

An object of the present invention is to provide a receiving device and a recording device capable of improving the processing efficiency of data transmission while maintaining reliability.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a receiving apparatus for receiving a signal composed of a plurality of packets transmitted in time series and decoding and recording a plurality of message information stored in each packet. A data adding unit that adds dummy data created in advance so that the format of the received data is similar to the format used for data recording in the recording device, at the last part of the data portion of each packet;
Data receiving means for outputting a signal to which dummy data has been added by the data adding means to a recording apparatus.

According to the present invention, when a signal composed of a plurality of packets transmitted in time series is received, and a plurality of message information stored in each packet is decoded and recorded, the data adding means Dummy data created in advance is added to the last part of the data portion of each packet so that the format of the received data is similar to the format used for data recording in the recording device. Since the format is approximated by the addition of the dummy data, the reliability of the data can be maintained. Since the format of the data is similar to the format used for data recording in the recording device, the data can be transferred in a process conforming to the original transfer process, and the efficiency of data transmission performed for recording in the recording device is improved. be able to.

Further, the present invention receives a signal composed of a plurality of packets, in which a frame in which a signal for error processing is added to the last packet is transmitted in time series, and a plurality of messages stored in each packet are received. In a receiving device that decodes and records information, dummy data created in advance is added to the last part of the data portion of each packet so that the format of the received data approximates the format used for data recording in the recording device. A receiving apparatus comprising: a data adding unit; and a data output unit that outputs a signal to which dummy data has been added by the data adding unit to a recording device.

According to the present invention, a signal consisting of a plurality of packets, in which a frame in which a signal for error processing is added to the last packet, is received in time series, and a plurality of packets stored in each packet are received. At the time of decoding and recording the message information, the data adding means creates in advance the final part of the data portion of each packet so that the format of the received data is similar to the format used for data recording in the recording device. Dummy data is added. Since the format is approximated by adding dummy data,
It is possible to improve the efficiency of data transmission performed for recording in the recording device while maintaining reliability.

In addition, in the present invention, when the dummy data is added to the received data, the data adding means also adds identification information indicating that dummy data is added to the signal to approximate a format. Data receiving means for receiving a signal to be added and transferred, and determining, based on the identification information, whether or not the signal to be transferred is a signal to which the dummy data is added. I do.

According to the present invention, the data determination means determines whether or not dummy data is added to the received data based on the identification information. Therefore, it is possible to perform appropriate processing on the received data according to the determination result. it can.

Further, the present invention relates to a recording device for recording a signal transferred from a receiving device, which receives the transferred signal and outputs a signal of a format used for data recording by the recording device or a dummy data. And a data determination unit that determines whether the signal is a signal approximated to the format based on the identification information, according to a determination result by the data determination unit. When the signal is a signal, recording is performed by a predetermined regular recording process, and when the received signal is a signal that approximates the format by adding dummy data, the data is complemented and recorded according to a preset specification. And a data recording unit for performing the recording.

According to the present invention, the signal to be transferred is a format used for data recording in the recording apparatus or a signal to which dummy data is added so as to approximate the format. And the transfer efficiency can be improved. According to the determination result of the data determination means, the data is complemented and recorded for the approximated signal, so that the recording can be performed in a state suitable for the recording device.

[0022]

FIG. 1 shows a schematic electrical configuration of a receiving terminal according to a first embodiment of the present invention. Although the receiving terminal of the present embodiment has both the receiving function and the recording function, the present invention can be similarly implemented even if the receiving function and the recording function are independent devices.

When data is received and recorded (REC), a broadcast wave is first received by an antenna 1 and input to a tuner unit 2 including a PLL (Phase Locked Loop) and a filter. In the case of digital broadcasting, after demodulation into digital data by the demodulation unit 3, error correction / detection and the like are performed, and the data is input to the compression unit 4a as PCM data. The compression section 4a is combined with the extension section 4b. The data that has been subjected to the compression processing by the compression unit 4a is output to the recording device 6 via the CPU 5, which is a control device, and is recorded. When performing a reproduction process (PLAY) for reproducing the data recorded in the recording device 6, the CPU 5 reads the data from the recording device 6, inputs the data to the decompression unit 4b, decompresses the data into PCM data, and then performs a digital interface (hereinafter referred to as "PCM data"). , "D_
(Hereinafter abbreviated as "I / F"), or converted into an analog signal by a D / A conversion circuit 8 and amplified by an amplifier (hereinafter abbreviated as "AMP"). A speaker or the like can be driven to obtain an acoustic output. The recording device 6 includes a recording medium such as a package medium,
Data recording and reproduction are possible for a semiconductor memory such as a flash memory or a memory card.

In the present embodiment, the CPU 5 operates as a data adding unit, a data output unit, a data determination unit, and a data recording unit according to a preset program.

Since the audio data, which is the main data of the FM broadcast or the like, is an analog signal, it is input from the tuner unit 2 to the A / D conversion circuit 10, converted to digital PCM data, and input to the compression unit 4a. After the compression processing, it is handled in the same manner as the above-described digital data.

Since the sub data is not subjected to the compression processing, it is inputted to the CPU 5 without being subjected to the compression processing by the compression section 4a. At the time of the reproduction process, the sub data is the predetermined data or the data selected by the key 11
U5, the liquid crystal display (L
Display device 1 including a CD) or a fluorescent display tube (FL)
2 and displayed as text or the like.

In the case of data transfer to another recording device or the like, of the data extracted from the recording device 6, the main data is decompressed by the decompression unit 4b, and the sub data is
_I / I7, and output according to the specifications of a predetermined digital audio interface. Conversely, in the case of data transfer from another receiving device or recording device, the data is received via the D_I / F7, divided into main data and sub-data, and the main data is subjected to compression processing by the compression unit 4a. The sub data is subjected to error detection processing and stored in the recording device 6.

FIG. 2 shows an outline of a broadcast system related to the receiving terminal shown in FIG. The data transmitted by broadcasting is
Created by the program creation company 21 or the like,
Alternatively, it is transmitted via the satellite 33 or the like. The format to be transmitted is uniquely determined according to the transmission path used. The broadcast data is received by the receiving terminal 31. Since the receiving terminal 31 of the present embodiment has an internal configuration as shown in FIG. 1, the broadcast data can be recorded in the recording device 6 and can be transmitted to another recording terminal 32 via the D_I / F 7. It can also be transferred and recorded.

FIG. 3 shows an example of a transmission format for digital data for broadcasting. FIG. 3A shows the transmission format of the first block, and FIG. 3B shows the transmission format of the second block and thereafter. The transmission format of broadcast digital data is composed of a header part for determining block synchronization, a program management part, message information, and redundant bits.

The header part for determining the synchronization is composed of several kinds of codes, and is used for determining the type of the block such as a data block / parity block, determining the block synchronization, and determining the frame synchronization at the data transmission level. If a header portion is detected a plurality of times continuously, it is determined that block synchronization has been established. If no header portion is detected a plurality of times continuously, it is determined that block synchronization has been lost.

The program management unit stores information on the type of the block data by “type identification” or “information identification”,
Transmitting station identification information of the data by "station identification", information for program identification by "program number", and "serial number information" indicating a block position when a message is large and one message is transmitted in a plurality of blocks. Protocol number, etc. are stored. As shown in FIG. 3A, program time information is further transmitted to the first block at the head.

The message information is transmitted in a format for each information for program identification. For example, various information such as display information at the receiving terminal, timer time information of the receiving terminal, and program list information being transmitted is transmitted in each format. In the present embodiment, among such message information, regarding the message information recorded on a recording medium such as a package medium for recording digital data electrically, magnetically, or optically on the receiving terminal side, the recording medium Use a format that is similar to the format of data transmission in pipes.

In the case of transmitting the message also in the program management information, it is possible to determine whether or not the subsequent message has a format similar to data transmission between recording media, depending on the type of data or the program identification. As such, it must be determined separately.

The redundant bits are used for error correction (error correction) and error detection (error detection) in transmission. For example, an error correction code used for FM teletext broadcasting suitable for a mobile object is used for correcting errors in a transmission path due to noise caused by multipath, fading, and the like.
For detection, information excluding the header part was targeted (2
72, 190) The product code of the difference set cyclic code is used.
Each block (packet) is provided with a parity bit for error correction and error detection of 82 bits, and further includes 82 packets in one frame for product code. One frame is composed of 272 packets, and 8 frames in one frame
The two-frame parity packet is interleaved with other data packets and transmitted. In FM teletext broadcasting, a 14-bit CRC (Cyc
lic Redundancy Check) A parity bit for error detection is added to enable error detection, and a 16-bit CRC for program is used for each program, further enhancing the error detection capability.

As described above, in the broadcast transmission system, the header portion required for transmitting the message information is required to manage the message information, which is the main body of the transmission data, as compared with the message information. The ratio of the program management unit and redundant bits for error correction / detection is large. FM mentioned above
In the case of teletext broadcasting, about 70% of one frame is a data packet and about 50% of the data packet is message information. Therefore, the amount of message information in one frame is about 3.5.
It is a percentage. For this reason, in the message information, it is required to improve the efficiency such as the reduction of the redundant part.

Next, the receiving terminal 31 shown in FIG.
2 will be described. Among data between recording media of digital audio data such as digital music data, a transmission format related to main audio data is standardized by a digital audio interface standard or the like. The digital audio interface is a standard for serially transferring digital PCM data. The digital PCM data can be used as main data, and various data such as text data and copyright information can be transferred in an interleaved manner.

FIG. 4 shows an example of the data transfer format of the sub data. In the data transfer format, the first four bytes of ID1 to ID4 are used to control data contents.
Assigned to management data. In the present invention, in particular, ID1 in the first byte is a code representing the type of data, and 3
ID3 of the byte is treated as the sequence number of the data in the divided data. Use of the data type indicated by ID1 enables data identification of album information, performers, lyricists, composers, and the like.

The main body of the sub data is transferred in 12 bytes of D1 to D12. When the sub data exceeds 12 bytes, the receiving side can handle it as a series of data by using the information of ID3 described above. Last two bytes of C
The RC data is a redundant bit for detecting the presence or absence of an error (error) due to noise or the like during transfer between recording media. This CRC data is for data transfer between recording media, and is not used when transferring broadcast data. The parity bits for error detection at the time of transfer of the broadcast data are separately prepared as described above.

FIG. 5 shows a conventional broadcast data transmission format including a data structure of a message. FIG. 5 (a)
5 shows the first pack, and FIG. 5B shows the second pack. When the data transmission format of the sub data between the recording devices is transmitted as the sub data transmission format by the broadcast wave, two packets (blocks) of the broadcast wave per data pack as the data unit of the sub data between the recording devices. ) Required. In particular, as shown in FIG. 5B, the second pack has a total of 288 bits (1 bit) for transmitting 1 byte of D1_12 and 2 bytes of CRC for error detection, which could not be transmitted in the first pack. 36 bytes) of data, which is inefficient. Note that ID1 to ID4 of the second pack are added for management of D1_12. If the program can be managed by the program management unit, the effect is the same even if it is omitted. The storage location of the CRC is D1_12
May be immediately after.

According to the present invention, first, a function of identifying data provided by broadcast data is added to ID1, and among data transmission formats between recording devices, a broadcast data program management unit protocol number or the like is used. ID3 which is data that can be restored is omitted. Also, CRC bits are reduced for each data pack unit. Further, by using CRC data in a frame unit in which a group of data transmitted in a plurality of data packs is combined, the amount of data transmitted between recording devices that transmit sub-data by broadcast waves can be reduced, and regular recording can be performed. A data transmission format similar to the transmission format between devices has been realized, and reliability has been improved by employing new CRC data.

FIG. 6 shows a data transmission format used in the present embodiment. FIG. 6A shows the transmission format of the first pack. ID1 is handled as data having an identification code indicating transmission data by broadcasting. The identification code is assigned to a specific bit among bits not conventionally used as a reserve, and is shared with conventional identification data. For example, the upper 4 bits (B4 to B7) are assigned to the flag as the identification code, and all the 4 bits are '
In the case of 1 ′ (“1111xxxx” = fxh), the data transmission format according to the present embodiment is determined. Note that "x" indicates that either "1" or "0" is possible in binary notation, and 0 to 1 in hexadecimal notation.
Indicates that any value of 5 is possible. Also, 'h'
Indicates hexadecimal notation.

In the normal data transmission format, the upper 4 bits of ID1 of the data group targeted for sub-data are "1".
000xxxx "(= 8xh), the lower 4 bits can be shared. For example, 81h: a singer name stored in a normal format, f1h: a singer name stored in a data transmission format. When decoding the sub-data for display or the like, the receiving terminal 31 can share a process such as data selection.

Since it is clear that this is the first pack, ID3 representing the sequence number is omitted. Since the value of ID3 of the first pack is fixed to 00h, it becomes unnecessary. As a result, the data of the first pack excluding the redundant portion can be accommodated in one packet in the transmission of the broadcast wave. If there is only data for the first pack,
With the second pack as the last pack, dummy data is sent to the data portion, and ID1 to ID4 and CRC are sent.

FIG. 6B shows the data transmission format of the second and subsequent packets except when there is only the data of the first pack. In the second packet, the data capacity of the message part is 152 bits (19 bytes).
If the pack does not appear in the last packet, ID1 to ID4
Up to 4 bytes and 12 bytes of data, a total of 16 bytes, can be contained in one packet. Here, in order to reduce the work of editing the data for conversion from the received data on the receiving terminal side to the data transfer format between the storage devices, the configuration of the message is made closer to the format of the pack configuration. Leave in. However, if you know the number of the pack, even if you omit ID3,
Restoration is possible.

FIGS. 6C, 6D and 6E show the data transmission format of the last pack. The final pack of the n-th pack is provided with 16-bit (2 bytes) CRC data for the entire data portion from the first pack. Although the data portion is indispensable as a cover area of the CRC data, ID1 to ID4 need not be covered. However, since the wider the target range, the higher the reliability can be. Therefore, all the effective data to be transmitted should be targeted, or the efficiency of processing on the recording device side including the receiving terminal 31 should be taken into consideration. It is effective that the ID1, ID2, ID4 and the data portion excluding ID3 omitted in one pack are subjected to CRC.

FIG. 6C shows an example of a data transmission format when all data (12 bytes) of the last n-th pack is made valid. This format is the most efficient as the number of valid data. FIG. 6D shows an example of a data transmission format that is effective when the CRC is processed not in the data transfer layer but in the data part as part of the data at the time of program creation in the upper layer, and the CRC is the data part. Is stored in FIG. 6E shows that the last part of the data is set to the CRC data (2 bytes) of the dummy data (00h) so that any of the above positions can be handled.
, Etc.) is an example of a data transmission format in which is inserted.

For example, when the receiving terminal 31 has a function of generating a CRC for pack transfer in order to transfer text data such as a comment originally input as sub data, the CRC is added to the data portion. The data transmission format shown in FIG. 6C or FIG. 6E where no data is stored is effective.

FIG. 7 shows a state in which a series of data is put together using the data transmission format shown in FIG. 6E in the last pack.

When data to be broadcast is received, error correction and error detection are performed using redundant bits stored in the broadcast data, so that the added CRC data is not used as described above. In addition, when the above-described CRC generation function for pack transfer is not provided, a process of inserting ID3 of the first pack into received data is performed, and then the data is recorded in the recording device. If a CRC generation function for the pack transfer is provided, the same processing as when the CRC generation function is not provided is performed, or ID1 is converted from fxh to 81h, ID3 is inserted, and a CRC in pack units is inserted. The data is converted into a regular pack data format by performing calculation and CRC insertion and recorded in the recording device.

Next, a description will be given of data processing in the case of transmitting data used in the present embodiment in data transfer between recording apparatuses. At the time of transmission, ID1 to ID4 and the data part are stored in the recording device.
For example, the dummy data of ffh is added to the part after the data part which becomes the CRC part in the normal data transmission format by 2 bits.
Send with additional bytes. For the final data, see FIG.
It is generated according to any of the specifications shown in FIGS. As a result, a data format similar to the original data transfer format between recording devices defined by the digital audio interface can be realized.

Finally, data processing in the case of receiving data used in the present embodiment in data transfer between recording apparatuses will be described. The receiving side determines the received ID1, and f
In the case of xh, error detection (CRC check) is not performed for each pack, and after receiving all packs of the target data,
Error detection is performed based on the received CRC data. If no error is detected as a result of the error detection, the data is stored in the recording device 6 as normal data. If there is an error, the display device 1
A trouble occurrence display or the like is performed in 2 etc. to notify the user. Erroneous data is discarded or temporarily recorded.
The temporarily recorded data is subjected to processing such as discarding or correction by the user. The reception determination of all the packs of the target data is performed by a flag specifying the last pack such as a last flag stored in advance in ID4 or the like, or by specifying the number of valid packs. The final pack determination is necessary even in conventional normal data processing, and a technique that has already been established may be used.

As a second embodiment of the present invention, a C for all packs of target data added in the first embodiment
The RC data can be omitted. In this embodiment,
The data transmitted to the receiving terminal by broadcasting is subjected to error correction and error detection using the data transmission format of the broadcasting, and after the ID3 is restored, it is recorded in the recording device. The format recorded on the recording device is the C for error confirmation at the time of pack transfer specified for regular pack transfer.
RC is replaced with dummy data (ffh), and the valid data portion is an approximate format that is common.

The format can be determined based on ID1. At the time of pack transfer of data determined to be an approximate format by ID1, a normal pack transfer is performed, except that the CRC check for each pack transfer is not performed or the CRC check for each pack transfer is replaced by a process such as ignoring. Perform the same processing. As a result, pack transfer processing based on regular processing can be performed on data received by broadcasting or the like.

In the case of the present embodiment, since the CRC check for all data can be omitted, the efficiency of data transfer can be further improved. In particular, for data for which data transfer is completed in one pack, there is no need to send a dummy pack for CRC data transfer in the first embodiment, and processing can be completed by transferring only one pack. Also, for the recording apparatus, the addition of the CRC check function for all data, which is an additional function, can be reduced. In the case where a CRC generation function for pack transfer mentioned in the description of the first embodiment is provided, a normal format in pack transfer can be restored. However, this involves an increase in cost and processing such as data generation processing.

FIGS. 8 and 9 show a data transmission format according to a third embodiment of the present invention. In the present embodiment, the data transfer efficiency can be further improved by cutting the dummy data and omitting ID3 in the broadcast format in the first embodiment. FIG. 8 (a)
The data transmission format of the first pack shown in FIG.
The data transmission format is the same as that of the first pack shown in FIG. Hereinafter, only differences from the first embodiment will be described.

In the case of the present embodiment, FIGS.
As shown in FIG. 8C and FIG. 8D, a plurality of pack data are stored in the second and subsequent packets. Therefore, since the ID3 storing the sequence data of the pack data has no meaning, the ID3 of the second and subsequent packs is supplemented by recalculation processing on the receiving side, and is omitted from the data to be transmitted. by this,
The transmission efficiency can be improved by reducing the data of one byte per packet. Further, as shown in FIG. 6B, the 3-byte dummy data following the data portion of the intermediate packet excluding the first and last packets is omitted. Thereby, as shown in FIG. 9, for example, the data transmission efficiency can be further improved.

In the receiving side of this embodiment, a process for extracting a series of pack data from the received packet is added, but it is also possible to improve the transmission efficiency of the broadcast wave and the reliability accompanying the reduction of the transmission amount. it can.

Further, as a fourth embodiment of the present invention,
In the third embodiment, the CRC data for all packs to be added can be omitted. The same effect as in the second embodiment with respect to the first embodiment can be obtained.

In the embodiments described above, the data transmission formats for different transmission systems, that is, data transmission by broadcasting and data transmission between recording devices, can be processed more efficiently at each data transmission level. It can be made to be.

The transmission in the broadcasting system has a strong error correction / detection ability against noise environments such as multipath and fading. The reliability obtained in this way is used effectively, and while ensuring the reliability in the broadcasting system, in the data transfer process between the recording devices, errors in data group units that target only significant data, not packets, By performing the detection, on the broadcast side, the C for error detection is used.
The number of RC generation processes can be reduced, and the number of times of error detection CRC calculation can be reduced from the pack unit to the group unit on the recording device side, and the processing amount can be reduced.

Since the data is transferred in a format similar to the data transfer format in packs between recording devices, the transmission side can perform transmission processing in the same processing as the normal format, and the reception side conforms to the normal format. Data reception processing can be performed, and the processing cost can be reduced.

When ID1 is used as pack type identification information at the time of data transfer, the type of data transmitted by broadcasting and the type of regular data are made common to a plurality of bits (lower 4 bits in the embodiment), so that data The determination processing and the data processing can be shared.

[0063]

As described above, according to the present invention, a signal in which a plurality of packets are transmitted in chronological order is received, and the format of the received data is approximated to the format used for data recording by the recording device, and the reliability is improved. , The efficiency of data transmission can be improved.

Further, according to the present invention, a signal is received in which a frame composed of a plurality of packets and a final packet to which a signal for error processing is added is transmitted in time series, and the format of the received data is recorded by the recording device. By approximating the format used for data recording, it is possible to improve the efficiency of data transmission performed for recording in a recording device while maintaining reliability.

Further, according to the present invention, it is possible to determine whether or not dummy data is added to received data based on identification information, and to perform appropriate processing on the received data.

Further, according to the present invention, a format used for data recording in a recording apparatus or a signal to which dummy data is added so as to approximate the format is used.
Processing for data transfer can be performed in substantially the same manner, and transfer efficiency can be improved. According to the determination result of the data determination means, the data is complemented and recorded for the approximated signal, so that the recording can be performed in a state suitable for the recording device.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic electrical configuration of a receiving terminal as a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating an outline of a broadcast system related to the receiving terminal of FIG. 1;

FIG. 3 is a diagram showing a broadcast data transmission format.

FIG. 4 is a diagram showing a data transmission format for transfer between authorized recording apparatuses.

FIG. 5 is a diagram showing a data structure of a conventional message in the broadcast data transmission format of FIG. 3;

FIG. 6 is a diagram showing a broadcast data transmission format used in the first embodiment of the present invention.

FIG. 7 is a diagram showing a series of data obtained by collecting the final pack in the format shown in FIG.

FIG. 8 is a diagram showing a broadcast data transmission format used in a third embodiment of the present invention.

FIG. 9 is a diagram illustrating data transferred using the format of FIG. 8;

[Explanation of symbols]

 2 Tuner section 3 Demodulation section 5 CPU 6 Recording device 7 D_I / F 12 Display device 22 Broadcasting station 23 Satellite 31 Receiving terminal 32 Recording terminal

Continuation of the front page F term (reference) 5D044 AB05 AB09 BC06 CC04 DE02 DE03 DE17 DE49 DE68 HL11 5K068 AA00 BA07 BB01 BC02 BC04 BC07 CB05

Claims (4)

[Claims] 1. A receiving apparatus for receiving a signal composed of a plurality of packets transmitted in time series and decoding and recording a plurality of message information stored in each packet. In a part, a data adding unit for adding dummy data created in advance and a signal to which the dummy data is added by the data adding unit are recorded so that the format of the received data approximates the format used for data recording in the recording device. A data output means for outputting the data to a device. 2. A signal comprising a plurality of packets, in which a frame in which a signal for error processing is added to the last packet is transmitted in time series, and a plurality of message information stored in each packet is decoded. Data receiving means for adding dummy data created in advance so that the format of the received data is similar to the format used for data recording in the recording device at the last part of the data portion of each packet. And a data output means for outputting a signal to which dummy data has been added by the data addition means to a recording device. 3. The data adding means, when adding the dummy data to the received data, also adds identification information indicating that dummy data is added to the signal for approximating a format, The apparatus according to claim 1, further comprising a data determination unit that receives the transferred signal and determines whether the transferred signal is a signal to which the dummy data is added based on the identification information. 3. The receiving device according to 1 or 2. 4. A recording device for recording a signal transferred from the receiving device according to claim 3, wherein the recording device receives the transferred signal and is a signal of a format used for data recording by the recording device. Data determining means for determining, based on the identification information, whether or not the signal approximates the format by adding dummy data, and the received signal is used for data recording by the recording device according to the determination result by the data determining means. When the signal is a format signal, recording is performed by a predetermined regular recording process, and when the received signal is a signal that approximates the format by adding dummy data, the data is complemented according to a preset specification. A recording apparatus, comprising: data recording means for performing recording.