JP2005151588A - Receiver and receiving method for packet transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a user to receive only a necessary packet. <P>SOLUTION: A system for multiplex transmission of packet data sequences on one or more control signal transmission channels and a plurality of information signal transmission channels is described. For a packet data sequence, time division multiplexing is applied to a packet corresponding to a plurality of programs, and packet/channel allocation information is transmitted through the control signal transmission channels. A receiver uses allocation information, resulting from demodulating the reception signal of a control channel among all the channels to select an information channel to be demodulated. When a user input program is not contained in the packet sequence identification information of the allocation information, channel selection is controlled to demodulate the information signal transmission channel, corresponding to identification information of the other packet sequence. However, when it is contained, the information signal transmission channel, corresponding to the identification information, is demodulated to reproduce the data of the packet designated by the allocation information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a receiving apparatus and a receiving method used in a packet transmission system in which packet data sequences are multiplexed and transmitted in parallel by a code division multiplexing method or the like.

  In the conventional packet transmission system, as shown in FIG. 17, on the transmission side, an error correction code is added to the packet data sequence by the correction encoding circuit 11, and then modulated by the modulation circuit 12 and transmitted from the antenna 13. On the receiving side, the signal of the entire band received by the antenna 14 is demodulated by the demodulation circuit 15, error correction is performed by the error correction circuit 16, the packet data series is reproduced, and then the packet ID specified by the user by the packet selection circuit 17 The packet data is extracted.

  Recently, development of digital broadcasting that simultaneously provides a plurality of programs using the above-described packet transmission system has been underway. In this case, in the conventional packet transmission system, a plurality of programs are transmitted as a packet data series, but the user can actually enjoy about one program in the receiving apparatus. All packets must be received, including packets that are not required by. This requires extra processing in the receiving apparatus, increases the circuit scale and power consumption, and greatly affects the cost of the receiving apparatus. In addition, since all packets are modulated together, it is difficult to perform flexible broadcasting such as changing the parameter of the error correction code for each packet (program) or changing the characteristics of the transmission signal.

  As described above, the conventional packet transmission system must receive all packets including those not required by the user on the receiving side, increasing the circuit scale and power consumption of the receiving device, and reducing the cost. Has a great impact on In addition, since all packets are modulated at once, it is difficult to perform flexible broadcasting when used for digital broadcasting, such as changing error correction code parameters or changing transmission signal characteristics for each packet. It has become.

  The present invention solves the above-mentioned problem, and can receive only the packet required by the user on the receiving side. In addition to this, the parameter of the error correction code can be changed for each packet, or the characteristics of the transmission signal can be changed. It is an object of the present invention to provide a receiving apparatus and a receiving method used in a packet transmission system capable of performing flexible broadcasting when used for digital broadcasting such as changing.

  A receiving apparatus for a packet transmission system according to the present invention is a receiving apparatus for a packet transmission system for transmitting a packet data sequence by multiplexing one or more control signal transmission channels and a plurality of information signal transmission channels in a code division multiplexing system. The packet data sequence is a time-division multiplexed packet corresponding to a plurality of programs, and assignment information indicating to which information signal transmission channel the identification information of the packet sequence and the identifier of each packet are assigned Is transmitted by the control signal transmission channel, demodulating means for demodulating the reception signal of the control signal transmission channel and each information signal transmission channel, and obtained by demodulating the reception signal of the control signal transmission channel, Allocation information including packet sequence identification information and packet identifier And selecting means for selecting an information signal transmission channel to be demodulated, detecting means for detecting an input program from the user, and whether or not the input program is included in the identification information of the packet sequence of the allocation information. Determining means for determining whether or not the input signal is demodulated by the information signal transmission channel corresponding to the identification information of a different packet sequence when the input program is not included in the identification information of the packet sequence. When the input program is included in the identification information of the packet series, the information signal transmission channel corresponding to the identification information is demodulated and the packet data specified by the allocation information is reproduced. And a reproducing means.

  The packet transmission system receiving method according to the present invention includes a packet transmission system receiving a packet data sequence by multiplexing one or more control signal transmission channels and a plurality of information signal transmission channels in a code division multiplexing system. The packet data sequence is a time-division multiplexed packet corresponding to a plurality of programs, and indicates which information signal transmission channel the identification information of the packet sequence and the identifier of each packet are assigned. When the allocation information is transmitted through the control signal transmission channel, when demodulating the control signal transmission channel and the reception signal of each information signal transmission channel, it is obtained by demodulating the reception signal of the control signal transmission channel, Allocation information including packet sequence identification information and packet identifier And selecting an information signal transmission channel to be demodulated, detecting an input program from the user, and whether or not the input program is included in the identification information of the packet sequence of the allocation information And when the input program is not included in the identification information of the packet sequence, the demodulation means is configured to demodulate the information signal transmission channel corresponding to the identification information of the different packet sequence. And, when the input program is included in the identification information of the packet sequence, demodulating an information signal transmission channel corresponding to the identification information and reproducing the packet data specified by the allocation information These are provided.

  According to the above-described invention, only the packet required by the user can be received on the receiving side, and in addition to this, the parameter of the error correction code is changed for each packet, or the characteristics of the transmission signal are changed. Thus, it is possible to provide a receiving apparatus and a receiving method used in a packet transmission system capable of performing flexible broadcasting when used for digital broadcasting.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a block diagram showing a configuration of a transmission device used in a packet transmission system for digital broadcasting according to the present invention. In FIG. 1, input packet data is assumed to be in a TS (Transport Stream) format generally defined by MPEG2 Systems, and a plurality of program (group) packets are time-division multiplexed.

The packet separation circuit 21 performs distribution according to a packet identifier (PID) in a specified range (group) from the input packet data series, and transmits packets in the range of PID = a _{1 to} b _1. Assign to channel # 1, assign packets in the range of PID = a _{2 to} b ₂ to transmission channel # 2, and similarly assign packets in the range of PID = a _{N to} b _N to transmission channel #N.

  On the other hand, the control data generation circuit 27 generates parameters, control data, and the like (hereinafter collectively referred to as control data) for synchronization of the transmission channels # 1 to #N. And packet group information (packet ID range) transmitted on each transmission channel is time-division multiplexed into control data.

  Here, the format structure of the control data will be described with reference to FIGS.

  For example, as shown in FIG. 2A, the control data includes a 125 μsec-long signal (hereinafter referred to as “pilot symbol (PS)”) that is modulated only by a synchronization spreading code every 250 μsec. This is a combination of a 125 μsec long frequency spread modulation signal (D) generated by spreading data such as various parameters with the same synchronization spreading code as the pilot symbol, and time-division-multiplexing both signals as a pair. In this control data, for example, as shown in FIG. 2B, one frame is composed of 51 pairs of pilot symbols and spread spectrum modulation signals as one unit, and one super frame is composed of 6 frames as one unit. Configure.

When each frequency spread modulation signal in one frame of control data is D ₁ , D ₂ , D ₃ ,..., D _{51 in} order from the top, D _{1 to} D ₅₁ are, for example, the following information: To do.

D ₁ is a synchronization word having a fixed pattern for frame synchronization, for example, a frequency spread modulation signal generated by spreading “01101010101101010101100110001010” with a spreading code for synchronization.

D ₂ is a synchronization word indicating the frame number in the super frame, for example, starting from 0x0 and increasing by 1 every frame and returning to 0x0 in the next frame after 0x5. As shown, a frequency spread modulation signal generated by spreading a value obtained by repeating a 4-bit binary number eight times with a spreading code for synchronization.

For example, as shown in FIG. 4, D _{3 to} D ₅₀ are identification information (7 bits), receiver activation signal (1 bit), CDM channel configuration information (568 bits), receiver activation additional information (48 bits), and error correction. Data composed of CRC check bits (16 bits) and Reed-Solomon (RS) code check bytes (128 bits) are byte interleaved and convolutionally encoded, and then spread with a synchronization spreading code to generate a frequency spread modulation signal. The signal is divided every 125 μsec.

Here, the identification information is information for identifying the content of the subsequent data, and is defined as shown in Table 1, for example.

  The receiver activation signal is a signal for prompting activation of the receiver in an emergency or the like. For example, it is “1” when it is desired to prompt activation of the receiver, and “0” otherwise.

  The CDM channel configuration information is composed of, for example, a starting CDM channel number (8 bits) and 10 channels of CDM channel individual configuration information (56 × 10 bits) as shown in FIG. Individual configuration information consists of interleave mode (4 bits), convolution mode (4 bits), TS-ID (16 bits), reserve (3 bits), minimum PID value (13 bits), version number (3 bits), maximum PID value (13 bits) Shall be.

  The start CDM channel number indicates, for example, which CDM channel information the first CDM channel individual configuration information in the CDM channel configuration information is, and the nth CDM channel individual configuration information has a CDM channel number. This is information on the CDM channel of (starting CDM channel number + n−1).

The interleave mode is data for designating the interleave size of the CDM channel, and takes values as shown in Table 2, for example.

The convolution mode is data defining the coding rate of the convolutional code of the CDM channel, and takes values as shown in Table 3, for example.

  The TS-ID is, for example, data indicating a transport stream number transmitted by the CDM channel. When there is no data to be transmitted, TS-ID = 0xFFFF, for example.

  The reserve is an area used as a future extension area of CDM channel configuration information, for example.

  The PID minimum value is, for example, data indicating the minimum value of the PID range in a TS packet transmitted by the CDM channel. When the same PID range is assigned to another CDM channel, a plurality of CDM channels are bundled. Indicates that the TS is configured.

  The version number is data that increases by one each time the setting is changed, for example.

  The PID maximum value is, for example, data indicating the maximum value of the PID range in a TS packet transmitted by the CDM channel. When the same PID range is assigned to another CDM channel, a plurality of CDM channels are bundled. Indicates that the TS is configured.

  The additional information at the time of starting the receiver is effective as auxiliary information for the receiver starting signal. For example, as shown in FIG. 6, type information (4 bits) indicating the level of urgency, the target area for emergency broadcasting, etc. The area identification information (12 bits) indicating the emergency broadcast program TS-ID (16 bits), and the emergency broadcast program number (16 bits).

The CRC check bit is information for checking a data error. For example, the check bit of the CRC is used for an error check by CRC with a generator polynomial of G (x) = x ¹⁶ + x ¹² + x ⁵ +1.

The check byte of the Reed-Solomon code is, for example, code generator polynomial g (x) = (x + λ ⁰ ) (x + λ ¹ ) (x + λ ² )... (X + λ ¹⁵ ); λ = 02h, field generator polynomial P (x) = x ⁸ In the Reed-Solomon (255, 239) code of + x ⁴ + x ³ + x ² +1, a shortened read generated by adding “00h” of 159 bytes before the input data byte and removing the leading 159 bytes after encoding The inspection byte when the Solomon (96, 80) code is used.

In D _{3 to} D ₅₀ , various information can be transmitted as extended information (616 bits) as shown in FIG. 7 in addition to the CDM channel configuration information and receiver additional information shown in FIG. Shall.

_D51 is a reserved area, and is a signal modulated only by a synchronization spreading code, for example.

  It is assumed that the CDM channel configuration information, receiver startup additional information, extension information, and the like described above are configured as shown in FIG. 8, for example, in units of one superframe. The symbol * in the figure indicates a receiver activation signal.

  In the control data format configuration described above, the present invention uses the CDM channel configuration information and extension information areas.

In FIG. 1, each packet separated into N channels by the packet separation circuit 21 is supplied to timing correction circuits 22 _{1 to} 22 _n . The timing correction circuits 22 _{1 to} 22 _n correct timing deviation that occurs when a specified packet is extracted from the input packet data series. This correction method is shown in FIG.

FIG. 9 shows packet processing contents of PID = a _{K to} b _K of one timing correction circuit 22 _k . Packets with PID = a _{K to} b _K are not necessarily transmittable on the transmission channel #K while preserving the time position in the original packet data sequence, so the timing correction circuit 22 _k shifts the transmission timing position. At this time, if the packet has predetermined timing data (time management information), the timing data is changed. Also, a null packet is inserted as necessary to match the transmission rate. A general example of timing data is PCR (Program Clock Reference) data in an MPEG2-TS packet.

In FIG. 1, the outputs of the timing correction circuits 22 _{1 to} 22 _n are supplied to the scramble circuits 23 ₁ to 23 _n , scrambled by a predetermined scramble key, and then sent to the error correction coding circuits 24 _{1 to} 24 _n . Supplied. Further, the control data is also supplied to the error correction coding circuit 24 _0.

The error correction encoding circuits 24 _{0 to} 24 _n are configured to perform read Solomon code, byte interleave, convolutional code, and control data and packet data output from the control data generation circuit 27 and scramble circuits 23 ₁ to 23 _n , and Encoding processing for error correction such as bit interleaving processing is performed. The output of each processing processing is supplied to CDM modulation circuits 25 _{0 to} 25 _n , subjected to CDM modulation by codes W _{0 to} W _n, and then subjected to multiple addition The circuit 26 adds and multiplexes, thereby generating a CDM signal. This CDM signal is transmitted through a predetermined transmission path such as terrestrial broadcast, satellite broadcast, cable broadcast or the like.

FIG. 10 is a block diagram showing a configuration of a receiving apparatus used in the packet transmission system for digital broadcasting according to the present invention. In this receiving apparatus, a CDM signal received by an antenna (not shown) or the like is distributed to n + 1 systems by a distribution circuit 31. The n + 1 system CDM signals distributed by the distribution circuit 31 are CDM demodulated by the respective codes W _{0 to} W _{n in the} CDM demodulation circuits 32 _{0 to} 32 _n, respectively, and then regenerated by the error correction circuits 33 _{0 to} 33 _n . -Decoding processing is performed for Dosolomon code, byte interleaving, convolutional code, and bit interleaving, thereby obtaining control data and an n-channel packet data string.

  The control data is supplied to the CDM channel selection circuit 35. The CDM channel selection circuit 35 extracts group information indicating the range of packet IDs assigned to each transmission channel from the control data, takes in the packet ID of the program selected and input by the user, and the packet ID is The transmission channel is identified from the included group information, and only the code of the channel is generated.

That is, as shown in FIG. 8, the control data specifies the range of packet identifiers (PID) transmitted in each channel for all CDM channels, and the CDM channel selection circuit 35 obtains this correspondence information. In response to a user's request, a search is made as to which transmission channel in which the desired packet ID is code-multiplexed is transmitted, and only the necessary transmission channel code W _k is generated, and only the signal of the transmission channel is demodulated. .

The demodulated signal selected by the above processing is descrambled by descrambling circuits 34 _{1 to} 34 _n and output as a desired packet (program information).

  According to the above configuration, by receiving control data on the receiving side, it becomes possible to recognize the group contents of each packet data transmitted on each transmission channel, and easily select only packet data of a desired packet. It becomes possible to receive, the circuit scale and power consumption of the receiving apparatus can be reduced, and the cost can be reduced.

  By the way, when the packet data of one group exceeds the transmission capacity of one transmission channel, it may be distributed to a plurality of transmission channels by the packet separation circuit 21. However, as shown in FIG. May be.

FIG. 11 (a) shows the configuration of the transmission apparatus. When the packet data (PID = a _{k to} b _k ) of the group assigned to one transmission channel #K exceeds the transmission capacity of that channel, the timing is shown. The packet data series scrambled by the scramble circuit 23 _k through the correction circuit 22 _k is separated into M channels by the packet separation circuit 41 _k and each of the error correction coding circuits 24 _{(k, 1) to} 24 _{(k, M )} , After performing error correction coding processing and CDM modulation processing in the CDM modulation circuits 25 _{(k, 1) to} 25 _{(k, M)} , the multiple addition circuit 26 multiplexes them with other transmission channels. In this case, the same group information transmitted through the added transmission channel is added to the control data.

FIG. 11 (b) shows the configuration of the receiving apparatus, corresponding to the transmission channels added on the transmission side, distributed to a considerable number of channels by the distribution circuit 31, of which channels # (k, 1) to # # (K, M) signal is CDM demodulated by CDM demodulation circuit 32 _{(k, 1) to} 32 _{(k, M)} , and error correction circuit 33 _{(k, 1) to} 33 _{(k, M)} is used to correct the error. Then, by multiplexing by the multiplexing circuit 42 _k , the packet data series of the same group can be taken out. This packet data series is descrambled by the descrambling circuit 34 _k and output.

That is, in the above case, since the packet (PID = a _{k to} b _k ) output from the packet separation circuit 21 exceeds the transmission capacity of one transmission channel, the transmission channel # (k, 1 ) To # (k, M). Similarly to the case of FIG. 9, the timing correction circuit 22 _k inserts a null packet and corrects time data so as to obtain a signal having a transmission rate of M times. This signal is sequentially separated from a young number for transmission channels # (k, 1) to # (k, M). In the control data, the range values of PID transmitted by transmission channels # (k, 1) to # (k, M) are set to be the same. This informs the receiving side that a plurality of channels are bundled. The error correction conditions such as the interleave length and coding rate in the error correction coding circuits 24 _{(k, 1) to} 24 _{(k, M)} are the same.

On the other hand, when receiving a packet transmitted using a plurality of CDM channels on the receiving device side, the corresponding codes W _{(k, 1)} and W _{(k, M)} are set, and a plurality of packet data sequences are received. Then, the original packet data (PID = a _{k to} b _k ) can be received by sequentially combining and multiplexing from a young number. The original packet data sequence can be restored by sequentially multiplexing error correction capabilities such as coding rate and interleave length under the same conditions.

  According to the above configuration, since packet data of the same group is distributed and transmitted to a plurality of transmission channels, the transmission capacity of one program, that is, the packets of the same group exceeds the capacity of one transmission channel. But transmission is possible. The receiving device side can also recognize that the plurality of transmission channels are bundled by receiving the control signal transmission channel.

  In the above configuration, the packet is not separated in the first stage, but is separated into a plurality of channels after passing through the timing correction circuit and the scramble circuit, so that the descrambling circuit and the circuit for timing correction are provided on the receiving side. Can be shared by one group, and an increase in circuit scale can be suppressed.

  By the way, if there is a difference in transmission delay between the transmission channel for transmitting the scramble key and the transmission channel for transmitting the scrambled packet due to the difference in the characteristics of the error correction code, the transmission device corrects the difference. It is necessary to perform processing. An example of the scramble circuit having this correction processing function is shown in FIG.

FIG. 12 is a block circuit diagram showing a specific configuration in the case where the scramble circuit 23 _k shown in FIG. 1 has the transmission delay correction function. Here, the time delay due to the error correction coding circuit of CDM channel # 1 is T _1, and the time delay due to the error correction coding circuit of CDM channel #k is T _M.

In FIG. 12, the scramble processing circuit 23 _k1 scrambles and outputs the packet data sequence (PID = a _{k to} b _k ) distributed to the CDM channel #k with the scramble key generated by the key generation circuit 23 _k2. To do. The key signal generated by the key generation circuit 23 _k2 is supplied to the scramble processing circuit 23 _k1 through the delay circuit 23 _k3 and is time-division multiplexed onto the CDM channel # 1 through the delay circuit 23 _k4 .

Here, the scramble circuit 23 _k, also the error correction time T ₁ of the CDM channel # 1, and error correction information of time T _M of the CDM channel #k is given, the control circuit 23 _k5 is these time information In response, the delay times of the delay circuits 23k3 and 23k4 are set to DM and D1, respectively.

The transmission timing is shown in FIG. 13 by taking T ₁ > T _M as an example. If no time correction is performed, the transmission timing of the scramble key is delayed by (T ₁ −T _M ) time as shown in FIG. Therefore, by inserting a delay time D _M of the difference corresponding with the delay circuit 23 _k3 in FIG. 12, descramble processing can be performed with a correct timing. Similarly, in the case of T ₁ <T _M, the delay time D ₁ of the difference corresponds can timed timing by inserting the delay circuit 23 _k4.

  FIG. 14 shows an example in which MPEG2-TS packets are arranged in a plurality of CDM transmission channels as packet data series. CDM # 0 transmits the TSID (PID range) transmitted by each CDM # 1 to CDM # 29 as a control channel (pilot channel). CDM # 1 and CDM # 2 collectively transmit common information such as billing information (including scramble key information), program arrangement information, and program related information. CDM # 4 and CDM # 5 transmit packets of the same packet ID by bundling two channels.

  FIG. 15 shows an example of a program selection sequence in the receiving apparatus of this system.

  First, when power is turned on, pilot channel # 0 is received (S1), a correspondence table (FIG. 16 (a)) of each CDM channel, TSID, and PID is obtained (S2), and a charging CDM channel (TSID unit) # 1 is received (S3), and NIT (FIG. 16C) is acquired (S4).

  Here, the user program No. It is determined whether there is an input (S5). If there is no input, it is determined whether it is in another TSID within the same 25 MHz band (S6), and if there is, the received TSID is changed (S7), step The process continues from S3. If it is not in another TSID in step S6, it is determined whether it is in a TSID within another 25 MHz band (S8). If there is, the transponder is changed (S9), and the processing is continued from step S1. If it is not in the TSID within another 25 MHz band in step S8, the program number is sent to the user. Prompt for re-entry.

  In step S5, program no. If there is, the PAT (FIG. 16B) is acquired (S10), the CDM channel including the PMT (PID = p) is received (S11), and the PMT (FIG. 16D) is acquired. (S12) The audio (PID = x) and video (PID = y) packets are acquired (S13), and the audio and video are reproduced (S14), thereby completing a series of processing.

  From the above, in the packet transmission system according to the present invention, for example, when used for digital broadcasting, a packet data sequence composed of a plurality of programs (groups) is allocated to a plurality of transmission channels that are code-division multiplexed by group, Divide and transmit. Further, one or a plurality of transmission channels to be code division multiplexed are allocated for transmission of control data, and group information (packet identifier range value) of packet data allocated to each transmission channel using this control data. Is transmitted. As a result, the receiving device can recognize the group contents of each packet data transmitted on each transmission channel by receiving the control data, and can easily selectively receive only the packet data of the desired packet. As a result, the circuit scale and power consumption of the receiving apparatus can be reduced, and the cost can be reduced.

  In addition, by distributing packet data of the same group to a plurality of transmission channels, transmission is possible even when the transmission capacity of one program, that is, the packets of the same group exceeds the capacity of one transmission channel. The receiving device side can also recognize that the plurality of transmission channels are bundled by receiving the control signal transmission channel.

  In addition, when distributing a packet data sequence to a plurality of transmission channels, the timing of the packet on the original packet data sequence may not be preserved and may be displaced. By correcting the existing time management information by the deviation, it is possible to reproduce at the correct timing on the receiving side.

  If there is a difference in transmission delay between the transmission channel for transmitting the scramble key and the transmission channel for transmitting the scrambled packet, for example, due to the difference in the characteristics of the error correction code, the transmission apparatus may The correction can be performed, and descrambling can be performed at the correct timing on the receiving side without delaying the packet itself to be transmitted.

  In the above embodiment, the case of multiplex transmission by the CDM method has been described. However, the present invention is not limited to this, and various multiplex transmission methods such as the OFDM method can be used. .

1 is a block circuit diagram showing an embodiment of a transmission device of a packet transmission system according to the present invention. The figure which shows the format structure of the synchronizing signal in the embodiment. It illustrates a format configuration of information to be transmitted in the region D ₂ of the synchronizing signal shown in FIG. It illustrates an example of information to be transmitted in the region D ₃ to D ₅₀ of the sync signal shown in FIG. The figure which shows an example of the CDM channel structure information shown in FIG. The figure which shows an example of the additional information at the time of receiver starting shown in FIG. Shows another example of information to be transmitted in the region D ₃ to D ₅₀ of the sync signal shown in FIG. The figure which shows the structural example of 1 super-frame of the synchronizing signal shown in FIG. FIG. 2 is a timing chart showing packet processing contents of the timing correction circuit shown in FIG. The block circuit diagram which shows the structure of the receiver of the embodiment. The block circuit diagram which shows the structure of the transmitter in case the packet data of one group exceeds the transmission capacity of one transmission channel in the same embodiment, and a receiver. The block circuit diagram which shows the specific structure in the case of providing the transmission delay correction function in the scramble circuit shown in FIG. FIG. 13 is a timing chart showing a timing relationship before and after correction of transmission delay of packet data series and scramble key in the scramble circuit configuration shown in FIG. 12. The figure which shows the example which has arrange | positioned the MPEG2-TS packet to several CDM transmission channels as a packet data series in the same embodiment. 6 is an exemplary flowchart illustrating an example of a program selection sequence in the receiving apparatus of the embodiment. The figure which shows the data content acquired at the step of FIG. The block circuit diagram which shows the structure of the conventional packet transmission system.

Explanation of symbols

11 ... correction encoding circuit 12 ... modulating circuit 13 ... transmission antenna 14 ... reception antenna 15 ... demodulation circuit 16 ... error correction circuit 17 ... packet selecting circuit 21 ... packet separating circuit 22 ₁ through 22 _n ... timing correction circuit 23 _{1-23 n} ... scramble circuit 24 _{0 to} 24 _n ... error correction encoding circuit 25 _{0 to} 25 _n ... CDM modulation circuit 26 ... multiple addition circuit 27 ... control data generation circuit 31 ... distribution circuit 32 _{0 to} 32 _n ... CDM demodulation circuit 33 ₀ ... 33 _n ... error correction circuit 35 ... CDM channel selection circuit 34 _{1 to} 34 _n ... descrambling circuit 41 _k ... packet separation circuit 24 _{(k, 1) to} 24 _{(k, M)} ... error correction coding circuit 25 _{(k , 1) to} 25 _{(k, M)} ... CDM modulation circuit 32 _{(k, 1) to} 32 _{(k, M)} ... CDM demodulation circuit 33 _{(k, 1) to} 33 _{(k, M)} ... error correction circuit 42 _k ... Multiplexing circuit

Claims (6)

A packet transmission system receiver for transmitting a packet data sequence by multiplexing one or more control signal transmission channels and a plurality of information signal transmission channels in a code division multiplexing system,
The packet data sequence is a time-division multiplexed packet corresponding to a plurality of programs, and the allocation information indicating to which information signal transmission channel the identification information of the packet sequence and the identifier of each packet are allocated. When transmitted by the control signal transmission channel,
Demodulating means for demodulating the received signals of the control signal transmission channel and each information signal transmission channel;
Selection means for selecting an information signal transmission channel to be demodulated using allocation information including identification information of the packet sequence and an identifier of the packet obtained by demodulating the reception signal of the control signal transmission channel;
Detection means for detecting an input program from a user;
Determining means for determining whether the input program is included in the identification information of the packet sequence of the allocation information;
By this means, when the input program is not included in the identification information of the packet sequence, the selection means is controlled to demodulate an information signal transmission channel corresponding to the identification information of a different packet sequence, and the input When the program is included in the identification information of the packet sequence, a reproducing unit that demodulates an information signal transmission channel corresponding to the identification information and reproduces the data of the packet specified by the allocation information;
A receiving device of a packet transmission system comprising:   The control signal transmission channel has a plurality of channels, and the other control signal transmission channel includes charging information corresponding to the packet sequence identification information, and acquires the charging information from the control signal transmission channel. The receiving device according to claim 1.   The receiving apparatus according to claim 1, wherein the packet series is in a transport stream format, and a plurality of programs are time-division multiplexed.   2. The receiving apparatus according to claim 1, wherein the determination unit prompts the user to re-input the program when there is no identification information of the packet series corresponding to the input program.   When the input program is included in the identification information of the packet series, the reproducing means demodulates an information signal transmission channel including a packet corresponding to audio data and video data, and reproduces the corresponding audio packet and video packet. The receiving apparatus according to claim 1, wherein: A packet transmission system receiving method for transmitting a packet data sequence by multiplexing one or more control signal transmission channels and a plurality of information signal transmission channels in a code division multiplexing system,
The packet data sequence is a time-division multiplexed packet corresponding to a plurality of programs, and the allocation information indicating to which information signal transmission channel the identification information of the packet sequence and the identifier of each packet are allocated. When transmitted by the control signal transmission channel,
When demodulating the received signal of the control signal transmission channel and each information signal transmission channel,
Selecting an information signal transmission channel to be demodulated using allocation information including identification information of the packet sequence and an identifier of the packet obtained by demodulating the received signal of the control signal transmission channel;
Detecting an input program from the user;
Determining whether the input program is included in the identification information of the packet sequence of the allocation information;
By this step, when the input program is not included in the identification information of the packet sequence, the demodulation means is controlled to demodulate the information signal transmission channel corresponding to the identification information of a different packet sequence, and the input When the program is included in the identification information of the packet sequence, demodulating an information signal transmission channel corresponding to the identification information, and reproducing the packet data specified by the allocation information;
A reception method for a packet transmission system comprising:

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