JP2001189752A - Device and method for selecting packet and reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently conduct collation and to appropriately identify and select a packet even if important data for identifying the packet is arranged in an arbitrary position in the packet. SOLUTION: A comparison control counter 74 counts packet data inputted to a first register 41 at every byte. A control circuit 75 generates a corresponding address and reads collation and mask data from a memory 36. XOR element 45 to OR element 47 conduct comparison and collation. In a period where important data does not exist, a skipping counter 73 courts the period and a comparison result is invalidated in the period. When the counting of the skipping counter 73 is terminated, the count value of the comparison control counter 74 is validated again and valid comparison/collation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
2 (moving picture compression system by Moving Picture Expert Group) -Packet selecting apparatus and packet selecting method capable of appropriately selecting a desired packet from an arbitrary sequence of packets such as a transport stream (TS) By properly selecting the packets
The present invention relates to a receiving apparatus that can appropriately receive data that is packetized, multiplexed, and transmitted.

[0002]

2. Description of the Related Art In most digital broadcasting systems, video and audio signals of each program are compressed and encoded in accordance with MPEG2 and broadcasted. Specifically, on the transmitting side, first, broadcast data is divided into 184 bytes, and a 4-byte transport stream (TID) including identification information such as PID (Packet IDentification) is divided.
An S: Transport Stream) header is added to make a 188-byte TS packet. Then, a TS packet containing actual program data and an additional information table (PSI: Program Specific Inform
) and PCR (Program Cloning).
The TS packet is multiplexed with a TS packet including an adaptation field having clock information such as ck reference, and the TS is QSK (Quadrature Shift Keying) modulated and broadcast.

On the receiving side, a QSK-modulated signal is demodulated to obtain a TS signal, and a TS packet of a user-specified program included in the TS is extracted based on the PSI and the PID assigned to each TS packet. I do. Then, the coded data of the video and audio included in the extracted TS packet is decoded and output from the monitor and the speaker.

[0004] Here, the PSI includes PAT (Pro
gram Association Table), PMT (Program Map Tabl
e), NIT (Network Information Table) and CA
There is a table called T (Conditional Access Table), and each of these tables is mapped to a TS packet in a structure having a syntax called a section. For example, as shown in FIG.
It is divided into a header HD1 and a section HD2. The HD2 includes data D1 indicating a table ID (0x00) (0x indicates hexadecimal notation), data D2 indicating a section length, data D3 indicating a version number, data D4 indicating a section number, and a last section number. And the data D5 indicating the following.
Data D6 indicating the data of I is stored.

[0005] Further, this section includes an EMM section for coping with a new service. As shown in FIG. 6, the header portion of this EMM section after the header of the TS has a table ID (table
identification) 8-bit, SSI (Section SyntaxInd)
icator) 1 bit, fixed value '0' 1 bit, fixed value (res
erved) '11' 2 bits, SL (Section Length) 12 bits, table extension
16 bits, fixed value (reserved) '11' 2 bits, VN
(Version Number) 5 bits, CNI (Current NextIndic
ator) 1 bit, SN (Section Number) 8 bits, LS
It is composed of 8 bytes of N (Last Section Number) 8 bits. After this LSN, skippable data bytes N × 8 bits, card ID (Card-ID) 8 bytes, data bytes M × 8 bits and CRC (CyclicRed
undancy check) Code 32 bits are stored.

[0006]

In such a TS packet, the type of data stored in the payload is represented by the PID and adaptation field control contained in the four bytes of the header at the head. The decoder extracts the desired packet by comparing this with the separation condition table. For example, in order to compare and detect a PAT section, as shown in FIG. 7, comparison is performed with a predetermined byte length, for example, every 16 bytes. That is, the data D of the separation condition table shown in FIG.
In order to compare 1 ′ to D6 ′ with the data D1 to D6 of the input section shown in FIG. 7A, a comparison process is performed using 16-byte continuous data, and as shown in FIG. Data D1 and data D1 ', data D4 and data D
4 ′ match, data D2 and data D2 ′, data D5
When the data D5 'and the data D5' do not match, the packet to be processed is separated. According to such a method, when the input section data is PSI,
When the data byte of the M section is 1 byte, if the data and the separation condition data are compared every 16 bytes, the separation can be performed at one time.

However, if the input section data is 16 bytes or more due to, for example, the data bytes of the EMM section data being 2 bytes or more, or the card ID being 2 or more, in other words, first, If there is a part of the required separation comparison data after 16 bytes, there is a problem that such conventional comparison processing for every 16-byte length cannot be performed at one time. As a result, there is a problem that the function of comparing and detecting the packets and the operation thereof are complicated.

In order to solve such a problem, a method of processing section data necessary for separation after 16 bytes by a host computer connected at a later stage can be considered. When performing important data processing other than the above, there is a problem that the load of data processing on the host computer increases and the processing time increases accordingly. Furthermore, when trying to add various standards that will be determined from now on, it is expected that important data will increase after the first 16 bytes, and even if it is processed by a host computer at a later stage, other processes will be considered. However, there is a problem that processing of the added header or the like is likely to be difficult. If the section data is 16 bytes or more,
Alternatively, if the data is composed of 16 bytes at intervals, continuous mask data and filters for the data must be formed, and there is a problem that it is difficult to deal with both hardware and software.

Therefore, an object of the present invention is to provide, for example, EM
Even in the case where comparison reference data for identifying a packet is arranged at an arbitrary position after the head portion in the packet as in the M section, for example, a load is imposed on another subsequent processing device. It is an object of the present invention to provide a packet selecting apparatus and a packet selecting method capable of appropriately performing a packet identification and selection process without causing any significant and complicated hardware configuration. Another object of the present invention is to efficiently and appropriately identify packets without imposing a load on other processing units and without significantly complicating the hardware configuration. Receive the transmitted signal multiplexed packets,
An object of the present invention is to provide a receiving device capable of appropriately extracting a desired packet.

[0010]

According to an aspect of the present invention, there is provided a packet selecting apparatus for selecting a specific packet from input data packets,
Input data control means for sequentially comparing input data packets by a predetermined data unit, and sequentially detecting whether or not the data to be compared includes identification information used for identifying the data packet; Comparison target selection means, when the detection result indicates that the data to be compared has the identification information, comparison reference data control means for selecting comparison reference data corresponding to the data, and the selected comparison reference Matching means for matching data with the corresponding data to be compared, and a packet for selecting the data packet based on a result of the matching for all the identification information arranged in the input data packet Selection means.

Preferably, the comparison target selecting means includes a continuous number of pieces of data having identification information used for identifying the data packet in a data string of the predetermined unit of the data packet; The continuous number of data having no identification information used for identifying the data packet is managed, and the detection is sequentially performed on the data to be compared. More preferably, the comparison target selecting means includes a first counter for counting a continuous number of data having identification information used for identifying the data packet, for the data to be sequentially compared, A second counter that operates exclusively with the first counter and counts a continuous number of data having no identification information used to identify the data packet, wherein the first counter is operating, A signal indicating that the data to be compared is data having the identification information is output.

Preferably, when the data to be compared has the identification information, the comparison reference data control means selects the comparison reference data corresponding to the data and the mask data corresponding to the data. . More preferably, the collation means collates the selected comparison reference data with the data to be compared, and performs a masking process on the collation result using the selected mask data. Is output to the packet selecting means. Specifically, the matching means detects whether each bit of the selected comparison reference data and the data to be compared matches, and compares the comparison result with the selected mask data. Then, only valid bits are extracted, and if all bits of the data of the masking result match, it is determined that the collation matches. More specifically, when the data to be compared is detected as data without the identification information, the comparing means selects the data to be compared,
It is determined that the collation matches. Specifically, the data packet is an MPEG2 transport stream data packet.

The packet selection method according to the present invention is a method for selecting a specific packet from input data packets, wherein the input data packets are sequentially subjected to predetermined data units for comparison, and In the target data, it is sequentially detected whether or not there is identification information used for identifying the data packet, and as a result of the detection, when the data to be compared has the identification information, it corresponds to the data. The comparison reference data to be compared, the selected comparison reference data is compared with the corresponding comparison target data, and the result of the comparison for all the identification information arranged in the input data packet Select the data packet based on the data packet.

A receiving apparatus according to the present invention is a receiving apparatus for selecting and receiving desired data from a signal in which a plurality of types of data to be transmitted are packetized and multiplexed. Receiving means, and a packet selecting means for selecting a desired data packet from the received signal, the packet selecting means, the data packets included in the received signal, sequentially in predetermined data units An input data control unit to be compared; a comparison target selection unit to sequentially detect whether or not the data to be compared includes identification information used to identify the data packet; A comparison reference data control means for selecting comparison reference data corresponding to the data when the identification data is present in the target data; Quasi-data, matching means for matching the corresponding data to be compared, and the data based on a result of the matching for all the identification information arranged in the data packet included in the received signal. Selecting means for selecting a packet.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described.
This will be described with reference to FIGS. In the present embodiment, a plurality of program data each including a video signal and an audio signal are packetized and multiplexed by MPEG2-TS to receive a broadcast signal, and a desired program is selected and viewed. The present invention will be described by exemplifying a receiving apparatus that performs the processing. FIG. 1 is a block diagram showing the configuration of the receiving device 10. The receiving apparatus 10 includes an antenna 11, a tuner / digital demodulator 12, a demultiplexer 13, a first
RAM 14, AV decoder unit 15, second RAM 1
6, CRT display processing unit 17, audio output processing unit 18, bus 19, CPU 20, ROM 21, and third RAM 22
Having.

First, an outline of the configuration and operation of the receiving apparatus 10 will be described. The antenna 11 is transmitted via, for example, a communication satellite (CS) or a broadcast satellite (BS).
It receives a broadcast signal modulated by MPEG-TS and outputs the received signal to the tuner / digital demodulation unit 12.

The tuner / digital demodulation unit 12 has a CP
Controlled by U20, the received signal input from the antenna 11 is subjected to processing such as digital demodulation and error correction to generate a baseband MPEG-TS signal, and the generated transport stream data (TS data) D10 To the demultiplexer 13.

The demultiplexer 13 converts the TS data D10 input from the tuner / digital demodulator 12 into
While being temporarily stored in the first RAM 14, the CPU
20 and encoded video and audio packets D1
1. Each TS packet D12 storing PSI data and PCR adaptation field data is separated. Separated video and audio encoded packet D11
Is output to the AV decoder 16 at a predetermined timing. The TS packet D12 storing the PSI data and the PCR adaptation field data is stored in the third RAM 22 via the bus 19, and is stored in the third RAM 22.
0 for processing.

The first RAM 14 stores the demultiplexer 1
3 is a memory for temporarily storing data to be subjected to demultiplex processing.

The AV decoder section 15 temporarily stores the video and audio coded packet data D11 input from the demultiplexer 13 in the second RAM 16, and is controlled by the CPU 20 to store the video and audio data. The video data D13 is sequentially decoded, and the video data D13 is output to the CRT display processing unit 17, and the audio data D14 is output to the audio output processing unit 18.

The second RAM 16 has an AV decoder 15
Is a memory for temporarily storing data on which decoding processing is to be performed.

The CRT display processing section 17 converts the decoded video data D13 input from the AV decoder section 15 into
The signal is converted into a signal to be actually output to a CRT and output as a video signal S2.

The audio output processing section 18 is an AV decoder section 1
The decoded audio data D14 input from 5 is converted into a signal to be actually output to a speaker, and output as an audio signal S3.

A bus 19 is a CPU bus of the receiving device 10, and includes a CPU 20, a ROM 21, a third RAM 22, a tuner / digital demodulator 12, and a demultiplexer 13.
And data transfer to and from the AV decoder unit 15.

The CPU 20 operates based on the operation program recorded in the ROM 21 and grasps the configuration of the transport stream received based on the control information D12 input from the demultiplexer 13, thereby obtaining In order for the receiving device 10 to perform a desired operation,
It controls each component of the receiving device 10. In addition, as one of such controls, the CPU 20 receives a selection of a program to be viewed by the operator via an interface means (not shown) with the operator.

The ROM 21 is a memory for temporarily storing data used for control processing in the CPU 20.

The third RAM 22 is a ROM that stores a program executed by the CPU 20, in other words, a control program for the entire receiving device 10.

In the receiving apparatus 10 having such a configuration, a broadcast signal S1 of a predetermined channel including a plurality of programs is received by the antenna 11, and encoding and modulation for transmission are demodulated by the tuner / digital demodulation unit 12. Then, each packet data D10 of the base band is obtained by decoding. Then, in the demultiplexer 13, the additional information table PSI is
The packet D12 used for the control in which is described is selected and transferred to the CPU 20.

The CPU 20 knows the configuration of a packet including content data such as video data and audio data based on the control information, and further selects a program to be output via an interface means (not shown) with an operator. Perform processing. When the program to be output is determined, the CPU 20
Alternatively, by controlling the AV decoder 15, only the video data and audio data of the determined program are decoded in the AV decoder 15.

Then, the determined video data D13
By the CRT display processing unit 17, for example, analog RG
The signal is converted into a signal S2 that can be displayed on a CRT device, such as a B signal, and is output from the receiving device 10. Also, audio data D
14 is also output from the AV decoder unit 15 to the audio output processing unit 18, converted into a signal S3 that can be output from an analog speaker, and output.

Next, the configuration and operation of the demultiplexer 13 will be described in detail with reference to FIG. FIG.
3 is a block diagram illustrating a configuration of the demultiplexer 13. FIG. The demultiplexer 13 includes a packet separating unit 30,
It has a first extraction device 31, a second extraction device 32, and a third extraction device 33.

The packet separating means 30 extracts the first to third packets D31 to D33 from the input digitally demodulated data sequence D10 based on the control signal C3. , To the second extraction device 32 and the third extraction device 33.

The first extracting device 31 extracts the encoded video packet data D11V from the first packet D31 inputted from the packet separating means 30, and
5 is output.

The second extracting device 32 extracts the audio encoded packet data D11A from the second packet D32 input from the packet separating means 30, and
5 is output.

The third extracting device 33 extracts and outputs the additional information D12 from the third packet D33 input from the packet separating means 30. As shown in FIG. 2, the third extracting device 33 includes an extracting unit 34, a header processing unit 35,
It has a memory 36 and a detecting means 37. Extraction means 34
Temporarily holds the third packet D33 inputted from the packet separating means 30, and based on a detection signal D40 inputted from the detecting means 37 described later, additional information D12
Is extracted and output. The output additional information D12 is supplied to the CPU 20 via the bus 19 of the receiving device 10.

The header processing means 35 extracts the control data D35 stored in the header area of the third packet D33 input from the packet separation means 30, and supplies the control data D35 to the detection means 37.

The memory 36 is a memory for storing a filter table having comparison data C36 and mask data M36 as shown in FIG. 3. Address data D36 is inputted from the detecting means 37 and stored at a corresponding address. The comparison data C36 and the mask data M36 are output to the detection means 37.

The detection means 37 compares and compares the comparison data C36 and the mask data M36 stored in the memory 36 with the control data D35 inputted from the header processing means 35 as reference reference data. It detects whether the applied packet is a desired data packet or not and outputs the detection result to the extracting means 34.

Finally, the specific configuration and operation of the detecting means 37 will be described in detail with reference to FIG. FIG. 4 is a block diagram showing a specific configuration of the detecting means 37. The configuration of the detecting means 37 can be roughly divided into a comparing section 40 and an address control section 70 as shown in the figure. Then, the comparison unit 40 includes the first register 41 and the second
Register 42, third register 43, XOR element 4
5, an AND element 46 and an OR element 47 are provided. The address control unit 70 includes a fourth register 71 and a fifth register 71.
, A skip counter 73, a comparison control counter 74, and a control circuit 75.

First, the configuration of the detecting means 37 will be described. The first register 41 of the comparing unit 40 is a register for temporarily storing control data D35 sequentially input from the packet separating unit 30. The second register 42 is a register for temporarily storing the comparison data C36 from the memory 36 constituting the filter table. The third register 43 is a register for temporarily storing the mask data M36 from the memory 36 constituting the filter table.

The XOR element 45 calculates the exclusive OR of the 8-bit control data D35 stored in the first register 41 and the 8-bit comparison data C36 stored in the second register 42. Then, they are compared, and the obtained comparison result is applied to one input terminal of the AND element 46. The AND element 46 is an XOR element 4
5 is masked by performing a logical AND operation with the 8-bit mask data M36 stored in the third register 43 to obtain a comparison result of only valid bits. To the OR element 47. The OR element 47 detects whether there is a valid bit mismatch bit by taking the logical sum of each of the eight bits, and outputs the result to the extracting means 34 as a comparison result.

Fourth register 71 of address control unit 70
Is a register for storing a value for counting the value of the comparison control counter 74 from the start to a predetermined value m, and the number of bytes of data to be compared and collated at the head of input head data. m is set in advance. The fifth register 72 includes a comparison control counter 74.
Is a register for storing data for skipping the data by a predetermined value h, and the number of bytes h of data in a section where comparison and collation are not performed is set in advance.

The skip counter 73 is a counter for counting a skip period in which comparison and collation are not performed. When the count value of the comparison control counter 74 reaches m, a signal to that effect is input to the skipping counter 73, and this is used as a trigger to read the value h stored in the fifth register 72. Start reading and counting down. The count result is output to the comparison control counter 74. When the count value becomes 0, the counting is completed.

The comparison control counter 74 is sequentially input to the first register 41 based on the number of bytes for comparison and reference set in the fourth register 71 and the count value of the skip counter 73. The data for each byte is counted, and it is determined whether or not comparison and collation are performed for each data. Then, it outputs the count value and a signal indicating that to the control circuit 75. The control circuit 75 reads out the data calculated based on the count value of the comparison control counter 74 to the memory 36 constituting the filter table when the signal for performing the comparison and collation is input from the comparison control counter 74. The address D36 is applied, and the comparison data and the mask data for the byte-by-byte data sequentially input to the first register 41 are read.

Next, the operation of the detecting means 37 will be described. First, it is assumed that, as data of the input stream D35, for example, 8 bytes from the table ID to the LSN of the header part of the EMM section as shown in FIG. In such a case, a value of m = 8 (bytes) is stored in the fourth register 71, and the stored value is set in the comparison control counter 74 in advance. As a result, until the counter value of the comparison control counter 74 changes from 0 to 8, the comparison control counter 74 outputs the count value and a signal to the effect that comparison and collation are performed to the control circuit 75. Outputs the read address D36 according to the count value to the memory 36 which is a filter table. As a result, from the memory 36, the comparison data C36 stored at that address is stored in the second register 42, and the masking data is stored in the third register 4
3 is output.

Then, the 8-bit data of the input data D35 stored in the first register 41 and the 8-bit data of the comparison data C36 stored in the second register 42 are applied to the XOR element 45, respectively. It is input and exclusive ORed. Then, the output data from the XOR element 45 and the mask data M66 stored in the third register 43 are respectively input to the AND circuit 46, and the AND operation is performed to perform a masking operation to perform an 8-bit operation. Is output. further,
The 8-bit output data is input to the OR circuit 47,
The logical sum of each bit is calculated to obtain a comparison result D40.
Is output to the extracting means 34.

Next, when the counter value of the comparison control counter 74 becomes m = 8 (bytes), the input stream D35
The data bytes (N bytes) which can be skipped in step (1) and the subsequent data are sequentially stored in the first register 41. The fifth register 72 stores h (h = N bytes;
N) is stored in the skip counter 73 in advance. When the control signal from the comparison control counter 74 is received, the skip counter 73 sets 0 to 0 from h. Count down to The comparison control counter 74 detects the count value of the skip counter 73 and does not send a signal to the control circuit 75 to perform comparison and collation until the count value becomes zero. As a result, the control circuit 75 does not supply the read address control signal to the memory from the count value of m + 1 to m + h bytes.

While the comparison and collation are not performed, the second
The data in the register 42 and the third register 43 are not updated, and only the input stream D35 stored in the first register 41 is continuously input by h bytes. as a result,
A logical operation is temporarily performed between the XOR element 45 and the OR element 47, but this logical operation is not used as a control reference and is not substantially used for controlling the EMM section extraction means. The data during this period may be unconditionally processed as if the comparison and collation matched.

Next, when the count value of the skip counter 73 becomes 0, a control signal to that effect is output from the skip counter 73 to the comparison control counter 74.
The signal is output from the comparison control counter 74 to the control circuit as a signal indicating that the comparison and collation are performed. as a result,
A signal for controlling the read address is applied to the memory 36 from the control circuit 75, and the address of the memory 36 is sequentially counted up. The comparison data C36 and the mask data M36 are stored in the second register 42 and the third register 43.

At this time, the first register 41 stores data subsequent to m + h + 1 bytes of the input stream D35,
Specifically, one or more CardIDs (8 bytes), M × 8 data bytes, and in some cases CR
C is sequentially and sequentially input. Therefore, the data of these input streams D35 are subjected to the logical operation (collation) and the mask operation as described above, and the comparison result D
40 are obtained. The comparison result D40 obtained by the detection unit 37 is supplied to the extraction unit 34, and the above-described logical operation is subsequently performed.

As described above, according to the detecting means 37 of the present invention, in the EMM section of the MPEG-TS or the like, there is data that can be skipped after the section header of 8 bytes, and after that, important data such as the card ID is read. Even if there is such data, these data can be detected by a series of processing. Therefore, it is not necessary to particularly complicate the hardware, so that it is possible to prevent the device from becoming larger and more complicated, and it is also suitable for circuit LSI. In addition, since such information can be detected in a series of processes, for example, a processor at a later stage,
An efficient system, that is, a receiving device or the like can be configured without imposing a load on a host computer or the like. Further, since such processing is not dispersed, desired data can be detected at high speed.
Further, it is possible to easily cope with a case where information that becomes identification information is added to the TS in the future.

Note that the present invention is not limited to the present embodiment, and various suitable modifications are possible. For example, when comparing control data and comparison data using a plurality of bytes, a plurality of detection means may be used in accordance with a plurality of bytes, or the detection means may be time-divisionally used in accordance with a plurality of bytes. good. Also, in the present embodiment, MPEG-TS has been exemplified, but the present invention is applicable to a device for selecting an arbitrary data packet having an arbitrary configuration and a device for receiving such transmission data.

[0053]

As described above, according to the present invention, in the case where comparison reference data for identifying a packet is arranged at an arbitrary position after the head portion in a packet, for example, in an EMM section, However, for example, a packet selection device and a packet selection device capable of appropriately performing a packet identification and selection process without imposing a load on other subsequent processing devices and without significantly complicating the hardware configuration. A method can be provided. In addition, it is possible to efficiently and appropriately identify packets without imposing a load on other processing units and without significantly complicating the hardware configuration, whereby packets in various forms are multiplexed. A receiving device that can receive a transmitted signal and appropriately extract a desired packet can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a receiving device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a demultiplexer of the receiving device illustrated in FIG. 1;

FIG. 3 is a diagram for explaining data stored in a memory 36 shown in FIG. 2;

FIG. 4 is a block diagram illustrating a configuration of a detecting unit of the demultiplexer illustrated in FIG. 2;

FIG. 5 is a diagram showing PA of PSI in MPEG-TW.
FIG. 3 is a diagram illustrating a configuration of T.

FIG. 6 is a diagram for explaining a header section of an EMM section;

FIG. 7 is a diagram for explaining a method of comparing and detecting the PAT section shown in FIG. 5;

[Explanation of symbols]

10 receiving apparatus, 11 antenna, 12 tuner / digital demodulator, 13 demultiplexer, 14 first
RAM, 15 ... AV decoder section, 16 ... second RA
M, 17: CRT display processing unit, 18: audio output processing unit,
19 bus, 20 CPU, 21 ROM, 22 third
RAM, 30 ... packet separating means, 31 ... first extraction device, 32 ... second extraction device, 33 ... third extraction device,
34 extracting means, 35 header processing means, 36 memory, 37 detecting means, 40 comparing section, 41 first register, 42 second register, 43 third register,
45 ... XOR element, 46 ... AND element, 47 ... OR element, 70 ... Address control unit, 71 ... Fourth register, 7
2: 5th register, 73: counter for skipping,
74: counter for comparison control, 75: control circuit

Claims (23)

[Claims] 1. An apparatus for selecting a specific packet from input data packets, comprising: input data control means for sequentially comparing input data packets by a predetermined data unit; Comparison target selection means for sequentially detecting whether or not there is identification information used for identifying the data packet in the data obtained, and, when the identification information is present in the data to be compared, Comparison reference data control means for selecting comparison reference data corresponding to data; matching means for matching the selected comparison reference data with the corresponding data to be compared; and in the input data packet Packet selecting means for selecting the data packet based on a result of the collation with respect to all the arranged identification information. Selection device. 2. The data processing apparatus according to claim 1, wherein the comparison target selection unit includes:
The number of consecutive data having identification information used for identifying the data packet, and the number of consecutive data having no identification information used for identifying the data packet are managed. 2. The packet selection device according to claim 1, wherein the detection is performed. A first counter for counting a continuous number of pieces of data having identification information used for identifying the data packet with respect to the data to be sequentially compared; A second counter that operates exclusively with the first counter and counts a continuous number of data having no identification information used to identify the data packet, wherein the first counter is operating, 3. The packet selection device according to claim 2, wherein a signal indicating that the data to be compared is data having the identification information is output. 4. The comparison reference data control means includes: a memory means for storing the comparison reference data; and, when the data to be compared has the identification information, a predetermined value corresponding to the data in the memory means. 2. The packet selection device according to claim 1, further comprising: a memory control unit that reads the comparison reference data of an address. 5. The comparison reference data control means, when the data to be compared includes the identification information, selects the comparison reference data corresponding to the data and the mask data corresponding to the data. 2. The packet selection device according to 1. 6. The comparing means compares the selected comparison reference data with the data to be compared, performs a masking process on the comparison result using the selected mask data, and performs the masking process. 2. The packet selection device according to claim 1, wherein a result of the packet selection is output to said packet selection means. 7. The comparison reference data control means includes: a memory means for storing the comparison reference data and the mask data; and when the data to be compared includes the identification information, 6. The packet selection device according to claim 5, further comprising: a memory control unit that reads the comparison reference data and the mask data at a corresponding predetermined address. 8. The comparing means detects whether or not each bit of the selected comparison reference data and each bit of the comparison target data match, and compares the comparison result with the selected mask data. The packet selection device according to claim 5, wherein the masking process is performed to extract only valid bits, and that if the data of the masking result match all bits, it is determined that the matching is matched. 9. The comparison means, if the comparison target selection means detects that the data to be compared is data without the identification information, performs comparison with the comparison target data. 9. The packet selection device according to claim 8, wherein it is determined that the two match. 10. The packet selecting means selects the data packet as the specific packet when all the data in the predetermined range of the input data packet match in the predetermined unit. The packet selection device according to claim 9, wherein 11. The data packet according to claim 1, wherein the data packet is MPEG2 (Mov
a moving picture compression method by an ing Picture Expert Group).
3. The packet selection device according to 1. 12. A method for selecting a specific packet from input data packets, wherein the input data packets are sequentially compared in predetermined data units, and the data to be compared are included in the comparison target data. Sequentially detecting whether or not there is identification information used to identify the data packet; as a result of the detection, when the data to be compared has the identification information, select comparison reference data corresponding to the data; The selected comparison reference data is compared with the corresponding data to be compared, and the data packet is determined based on a result of the comparison with respect to all of the identification information arranged in the input data packet. Packet selection method to select. 13. A receiving apparatus for selecting and receiving desired data from a signal in which a plurality of types of data to be transmitted are packetized and multiplexed, a receiving means for receiving a sequentially transmitted signal, Packet selection means for selecting a desired data packet from the received signal, wherein the packet selection means sequentially compares data packets included in the received signal by predetermined data units in an input data control Means, a comparison object selecting means for sequentially detecting whether or not there is identification information used for identifying the data packet in the data to be compared; and, as a result of the detection, the identification When there is information, a comparison reference data control means for selecting comparison reference data corresponding to the data; Matching means for matching the data to be compared, and selecting to select the data packet based on a result of the matching for all the identification information arranged in the data packet included in the received signal. And a receiving device. 14. The receiving apparatus according to claim 13, wherein said transmitted data packet is transmitted as a modulated signal, and further comprising demodulation means for demodulating said received signal. 15. The apparatus according to claim 15, further comprising a separating unit for separating the data packet included in the demodulated signal into a packet including desired content data and a packet including control information. The receiving device according to claim 14, further comprising: selecting a desired packet from a packet including information. 16. The receiving apparatus according to claim 15, further comprising second packet selecting means for selecting a packet containing desired content data from a packet containing said content data based on said selected control information. . 17. The receiving apparatus according to claim 16, wherein said content data is coded data, and further comprising a decoding means for decoding said content data included in said selected packet. 18. The receiving apparatus according to claim 17, further comprising output means for reproducing and outputting said decrypted content data. 19. The data packet according to claim 1, wherein the data packet is MPEG2 (Mov
a moving picture compression method by an ing Picture Expert Group).
4. The receiving device according to 3. 20. A method according to claim 19, wherein said comparison target selecting means includes: a continuous number of data having identification information used for identifying said data packet in a data string of said predetermined unit of said data packet; 14. The receiving apparatus according to claim 13, wherein a continuous number of data having no identification information used for packet identification is managed, and the detection is sequentially performed on data to be compared. 21. The comparison reference data control means, when the data to be compared includes the identification information, selects the comparison reference data corresponding to the data and the mask data corresponding to the data. 14. The receiving device according to claim 13. 22. The comparing means compares the selected comparison reference data with the data to be compared, performs a masking process on the comparison result using the selected mask data, and performs the masking process. 22. The receiving device according to claim 21, wherein a result of (i) is output to said selecting means. 23. The comparison reference data control means: a memory means for storing the comparison reference data and the mask data; and when the data to be compared has the identification information, 23. The receiving device according to claim 22, further comprising: a memory control unit that reads the comparison reference data and the mask data at a corresponding predetermined address.