JPH11234226A - Device and method for reception - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain improvement of convenience by converting a satellite wave into a data stream, based on a retrieved transmission method. SOLUTION: A tuner 41 transmits to a modulation part 45 a demodulation signal of satellite wave S1 obtained by way of a selected transponder under control of a CPU 42. This demodulation part 45 decodes a transport stream by demodulating transmission encoding data based on the modulation signal by a predetermined system (for example, a synchronization detection system and so on) and then further decoding by means of a viterbi decoding method. Moreover, the demodulation part 45 recovers the encoding data as the transport stream by retrieving a symbol rate of these transmission encoding data in a range in which demodulation is possible on the basis of the control of the CPU 42 and then further retrieving a convolution encoding rate of the transmission encoding data in a range in which the viterbi decoding is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order.

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 8) Effects of the Invention

[0003]

The present invention relates to a receiving apparatus and a receiving method, for example, a communication satellite (CS).
This is suitable for application to a digital broadcasting system using llite).

[0004]

2. Description of the Related Art Conventionally, in a case where broadcast information provided by a specific broadcaster is received by a receiver of a general broadcaster via a communication satellite, the broadcast receiver who has contracted with the broadcaster has received the information. A technique is adopted in which only the receiving device can receive satellite waves transmitted from the satellite ground station on the broadcaster side.

[0005] In this case, in the receiving device, the occupied frequency band of the satellite transponder (transponder) mounted on the communication satellite is set in advance to the frequency band occupied by the broadcasting company to be contracted, and The transmission method of the satellite wave transmitted from the satellite ground station on the operator side is also set in advance.

[0006]

By the way, several broadcasting companies transmit satellite waves from a plurality of satellite ground stations owned by at least one or more satellites, and all the satellite waves are received by a single receiver. At the time of each satellite ground station,
The occupied frequency band of the transponder and the transmission method of the satellite wave may be different. In particular, information indicating which transponder is relayed and which transmission method is used for a satellite wave transmitted from a satellite terrestrial station owned by a newly entered broadcasting company is not determined. It is also conceivable that even a broadcaster who is currently performing a broadcasting business changes the transponder and the transmission method.

At this time, the user who uses the receiving device needs to recognize the occupied frequency band of the transponder for each satellite ground station and to convert the satellite wave transmission system (ie, to initialize). As a result, when the user selects a transponder for each satellite wave and changes the transmission method of the satellite wave, there is a problem that a trouble arises.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a receiving apparatus and a receiving method with greatly improved usability.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, each satellite wave transmitted from a plurality of satellite ground stations according to a predetermined transmission system has a different occupied frequency band. A predetermined number of satellite repeaters are allocated, and in a receiving apparatus and a receiving method for receiving each satellite wave by relaying the corresponding predetermined number of satellite repeaters, the selecting means is used to select the carrier frequency of the received satellite wave. After the search, a satellite repeater having a center frequency closest to the searched carrier frequency is selected from a plurality of satellite repeaters, and further transmitted by relaying the selected satellite repeater using the conversion means. After searching for the transmission method of the satellite wave, the satellite wave is converted into a data stream based on the searched transmission method.

As a result, when each satellite wave transmitted from a plurality of satellite ground stations via a satellite is received, the user adjusts the carrier frequency of the satellite wave to select a corresponding satellite transponder, The complexity of converting the wave transmission method can be avoided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a digital broadcasting system as a whole. A plurality of satellite ground stations 2A to 2N owned by at least one or more broadcasting companies are provided with:
Among a plurality of transponders (satellite repeaters) 4 mounted on the communication satellite 3, a predetermined number of transponders are allocated to each satellite wave S1 to be transmitted.

Each of these satellite ground stations 2A to 2N multiplexes video data and audio data constituting program information for a plurality of channels to generate a data stream.
The obtained plurality of data streams are respectively transmitted to the satellite waves S1.
A to S1N are transmitted via the communication satellite 3 to the receiving device 5 to be received, while the receiving device 5
A data stream of video and audio data constituting program information of a desired channel is extracted from a satellite wave S1 transmitted from a satellite ground station owned by a desired broadcaster, and video data and audio data stored in the data stream are extracted. Video is displayed based on audio data, and audio is output.

In this digital broadcasting system 1,
As shown in FIG. 2, the plurality of satellite ground stations 2A to 2N are provided with the same number of transmitting devices 6A to 6M as the predetermined number of transponders 4 assigned to each satellite ground station 2, respectively.

The transmitting devices 6A to 6M are provided with encoders 7A to 7X for the number of channels that can be relayed by one transponder 4, respectively. When the video data D _{VA to} D _VX and the audio data D _{AA to} D _AX for a plurality of programs constituting one channel are supplied, the encoders 7A to 7X respectively control the control signal S2 supplied from the CPU 8.
MPEG2 (Moving Picture Experts Gro
After performing the compression encoding by the up Phase 2) method, each of the TS packets D1A to D1X is sequentially formed into TS (Transport Stream) packets for each predetermined unit (for example, for each 188 [byte] data amount). Is supplied to the multiplexer 9.

Each of the TS packets D1A to D1X is composed of a header section and a data section, and the header section includes a synchronization byte and a packet identifier (hereinafter referred to as PID (Packet I).
dentification) and various other packet control data. Incidentally, the synchronization byte is data indicating the start of a TS packet, and the PID is data indicating the content of information stored in the TS packet.

The multiplexer 9 forms a series of transport streams DT1 by multiplexing each of the TS packets D1A to D1X, and sends them to the transmission path encoding unit 10.

The transmission line encoding unit 10 has a configuration as shown in FIG. 3, and converts the transport stream DT1 supplied from the multiplexer 9 into an energy diffusion unit 20.
To receive. The energy dispersing unit 20 synchronizes the synchronization bytes in the header for every eight packets with respect to each TS packet forming the transport stream DT1, and the same pattern as the synchronization byte appears continuously in the data part. In this case, the frequency spectrum is averagely dispersed (that is, the “1” and “0” patterns are evenly distributed) to prevent the synchronization from being disturbed.

Subsequently, the outer encoding unit 21 converts each of the TS packets whose synchronization has been adjusted into, for example, Reed-Solomon (RS: Reed Sol
omon) A block code such as a code is added as an outer code.

When a burst error (that is, a locally concentrated error) occurs in each TS packet to which an outer code has been added, the interleave processing unit randomizes the burst error irregularly in time. Replace with an error (perform so-called interleave processing).

Further, the inner encoding section 23 has a configuration as shown in FIG. 4, and each of the interleaved T
A series of information sequence u consisting of S packet, the serial-parallel converter 30, after dividing into k blocks u ₁ ~u _k each consisting of one bit, each such block u ₁ ~u _k
Is parallelized. Subsequently serial-parallel converter 30, each via a parallelized plurality of blocks u ₁ ~u _k delayer cascaded to m stages each _{D t1 ~D tm (t = 1} ...... k) block After sequentially delaying m times one bit at a time for each of u _{1 to} u _k , these are all sent to the combinational logic unit 31.

The combinational logic unit 31, for block u ₁ ~u _k having m time series bits respectively, bits of a preceding (m + 1) (hereinafter, referred to as the number of bits with a constraint length) and the currently input Mod2 addition (ie, binary addition) with the bit is performed. According to the addition result, a ratio R1 (= k / n) between the number k of bits of the information sequence u and the number n of bits of the convolutionally coded code sequence v (hereinafter referred to as a convolutional coding rate and ) Are obtained, and thus the encoding blocks v ₁ to v ₁ to
v _n via the parallel-serial converter 32 is output as a sequence of code sequence v.

Incidentally, the convolutional coding rate R1 is:
The higher the value, the lower the error correction capability on the receiving device 5 side, but the larger the amount of transmitted information, so that a predetermined value is set in advance for each broadcaster (ie, each satellite ground station).

The waveform shaping section 24 has a roll-off filter (not shown), and performs band limitation on the code sequence v of the convolutional coding rate R1 so as to satisfy the Nyquist criterion. The data is transmitted to the modulating unit 11 (FIG. 2) as transmission encoded data DT2. Incidentally, it is desired that the bit rate (hereinafter, referred to as a symbol rate) R2 of the transmission encoded data DT2 be as high as possible within a range that satisfies the allowable value of the transmission bandwidth. A predetermined value is set in advance for each user (that is, each satellite ground station).

The modulation section 11 converts the transmission coded data DT2 thus band-limited to, for example, QPSK (Quadrature).
By performing digital modulation according to the Phase Shift Keying) method, unnecessary spectrum outside the transmission band can be reduced while preventing intersymbol interference, and the modulated signal _STS obtained in this manner is transmitted to the antenna device 12. I do.

[0026] Each transmitter device 6A~6M in this way, a series of data stream (transport stream) each modulated signal S _TSA to S obtained by multiplexing a plurality channels
_It is transmitted to the antenna device 12 as _TSM .

Thus, in FIG. 1, each satellite ground station 2A
To 2N transmit the same number of modulated signals S _{TSA to} S _TSM as the number of transponders respectively assigned to the satellite waves S1A.
S1N is transmitted to the communication satellite 3. This communication satellite 3
In each of the transmitted satellite waves S1A to S1N, the modulated signals S _{TSA to} S _TSM are transmitted to the receiving device 5 (FIG. 1) via the corresponding transponder 4.

Specifically, the communication satellite 3 is JCSAT-3 owned by Japan Satellite Systems (JAST) (company name). The occupied frequency array of each transponder 4 mounted on the communication satellite 3 is shown in FIG. 5 is represented. In FIG. 5, 14/12 (10.6 to 15.7) [G
Hz] Ku band, the range of 12.2 to 12.75 [GHz] is a frequency band usable in Japan, and the use band is divided into two types of vertical polarization and horizontal polarization using the orthogonal dual polarization method. In addition, transponders are sequentially assigned to the vertical polarization and the horizontal polarization for each predetermined bandwidth so as not to interfere with each other.

That is, a plurality of transponders JD1 having a frequency bandwidth (hereinafter referred to as an allocated bandwidth) of 36 [MHz] allocated to one transponder.
To JD16 are sequentially and alternately arranged in vertical polarization and horizontal polarization while maintaining a band interval of 40 [MHz]. Further, a plurality of transponders JD having an allocated bandwidth of 27 [MHz]
17 to JD28 are sequentially and alternately arranged in vertical polarization and horizontal polarization while maintaining a band interval of 30 [MHz]. Of these, the bandwidth that can actually be used for broadcasting is 27
[MHz] 16 transponders JD1 to JD
Sixteen.

On the other hand, the receiving device 5 in the digital broadcasting system 1 supplies the satellite wave S1 (S1A to S1N) received via the antenna device 40 to the tuner 41 and the subsequent CPU 42 as shown in FIG. The CPU 42
The transponder 4 having the center frequency closest to the carrier frequency of the satellite wave S1 is selected by finding the satellite wave S1 having the lowest frequency band among the carrier frequencies of the received satellite waves S1A to S1N.

In practice, when receiving the satellite waves S1A to S1N via the tuner 41, the CPU 42 enters the transponder selection processing procedure RT1 shown in FIG. 7 from step SP0, and in step SP1, the frequency of the carrier frequency of the satellite wave S1 is entered. The band is searched while sequentially increasing the frequency by a predetermined value from the lowest frequency that can be set by the tuner 41. Subsequently, in step SP2, the CPU 42 determines whether or not a flag that rises only when the frequency at the time of the search is within the frequency band of the carrier frequency (hereinafter, this flag is referred to as a reception flag) has risen.

If a negative result is obtained in step SP2, the CPU 42 proceeds to step SP3 to increase the frequency at the time of retrieval by a predetermined value, and then repeats step SP2.
The above processing is repeated until the reception flag rises. Thus, if a positive result is obtained in step SP2, this means that the frequency at the time of search has fallen below the lower limit of the frequency band of the carrier frequency. At this time, the CPU 42 sets this frequency (hereinafter, this value to the lower limit). (Referred to as a frequency) is stored in the memory 43.

Subsequently, the CPU 42 proceeds to step SP5 and determines whether or not the reception flag has fallen while checking the reception state of the tuner 41. If a negative result is obtained, the CPU 42 proceeds to step SP6. After the frequency at the time of retrieval is increased by a predetermined value, the process returns to step SP5 and repeats the above-described processing until the reception flag falls.
Thus, if a positive result is obtained in step SP5, this means that the frequency at the time of search has fallen above the upper limit of the frequency band of the carrier frequency.
2 is this frequency (hereinafter this value is called the upper limit frequency)
Is stored in the memory 43.

Next, the CPU 42 proceeds to step SP8, reads the lower limit frequency and the upper limit frequency from the memory 43, calculates an intermediate value between them, and then obtains the frequency thus obtained (hereinafter referred to as the initial reception frequency). ) Is sent to the tuner 41 as the frequency setting signal S5. As a result, the tuner 41 selects the transponder 4 having the center frequency closest to the initial reception frequency based on the frequency setting signal S5 (that is, the intermediate value of the occupied frequency band). Thereafter, the CPU 42 proceeds to step SP9 and ends the transponder selection processing procedure RT1.

Thus, the tuner 41 (FIG. 3) has a CPU
42 under the control of the modulated signal S _TS satellite waves S1, which is obtained through the transponder 4 which is selected is sent to a demodulator 45. The demodulation unit 45 demodulates the transmission coded data based on the modulated signal _STS by a predetermined method (for example, a synchronous detection method or the like), and further decodes the data using a Viterbi decoding method, thereby forming a transport stream. To restore. Incidentally, the Viterbi decoding method (maximum likelihood decoding method) is a decoding method that corrects a transmission error generated in a transport stream by observing a code sequence composed of the above-described convolutional code and obtaining a code sequence closest to the code sequence. .

In addition to the above configuration, when the demodulation unit 45 cannot demodulate the transmission encoded data based on the supplied modulated signal _STS , the demodulation unit 45 controls the CPU 42 to control the symbol rate R2 of the transmission encoded data based on the control. After searching in the demodulatable range, the convolution coding rate R1 of the transmission coded data is further searched in the Viterbi-decoding range, so that the transmission coded data can be restored as a transport stream. ing.

When the CPU 42 actually receives the transmission coded data via the demodulation unit 45, it enters the transport stream restoration processing procedure RT2 shown in FIG. 8 from step SP10, and in step SP11, the symbol rate R2 of the transmission coded data is obtained. From the lowest rate that can be set at the time of demodulation by the demodulator 45 while sequentially increasing the rate value by a predetermined value. Subsequently, in step SP12, the CPU 42 determines whether or not a flag that rises only when the rate value at the time of the search is within the rate range of the symbol rate R2 (hereinafter, referred to as a demodulation flag) has risen.

If a negative result is obtained in step SP12, the CPU 42 proceeds to step SP13 to increase the rate value at the time of retrieval by a predetermined value, and then returns to step SP12 again to repeat the above-described processing until the demodulation flag rises. repeat. Thus, if a positive result is obtained in step SP12, this indicates that the rate value at the time of search has fallen within the rate range of the symbol rate R2. At this time, the CPU 42 allows the demodulation unit 45 to demodulate the symbol rate R2. It is determined that the state has been reached and step S
Proceed to P14.

Subsequently, the CPU 42 proceeds to step SP14, where the convolutional encoding rate R of the transmission encoded data is obtained.
1 is searched by the demodulator 45 while sequentially increasing the rate value by a predetermined value from the lowest rate that can be set at the time of Viterbi decoding. Subsequently, in step SP15, the CPU 42 determines whether or not a flag that rises only when the rate value at the time of the search is within the rate range of the convolutional encoding rate R1 (hereinafter, referred to as a decoding flag) has risen. I do.

If a negative result is obtained in step SP15, the CPU 42 proceeds to step SP16 to increase the search rate value by a predetermined value, and then returns to step SP12 again to repeat the above-described processing until the decoding flag rises. repeat. If a positive result is obtained in step SP15, this means that the rate value at the time of retrieval has fallen within the rate range of the convolutional coding rate R1, and at this time, the CPU 42 determines that the demodulation unit 45 It is determined that the decoding rate R1 is in a state in which Viterbi decoding can be performed, and the process proceeds to step SP17.

In this step SP17, the CPU 4
2 is thus the symbol rate R of the transmission encoded data.
2 and the search result of the convolutional coding rate R1 are sent to the demodulation unit 45 as the restoration enable signal S7, and the demodulation unit 45 converts the supplied transmission encoded data into the restoration enable signal S7.
7 to a transport stream. Thereafter, the CPU 42 proceeds to step SP18 to end the transport stream restoration processing procedure RT2.

From the transport stream thus obtained, each TS packet of video and audio data constituting the program information of the channel designated by the user is extracted in the demultiplexer 46, and each of the extracted video and audio data is extracted. TS packet is a decoder (IRD: Inte
grated Receiver Decoder).

The decoder 47 decodes the video and audio TS packet data to display the video of the program specified by the user based on the restored video and audio data thus obtained. And
It is designed to output audio.

[0044] Incidentally, each broadcaster has a DVB (Division)
gital Video Broadcasting) MPEG2 standard
The transport stream according to the method is transmitted from satellite waves S1A to
In the case of transmission as S1N, if one transponder 4 can be selected, the transport stream based on the satellite wave S1 obtained via the transponder 4 includes the frequency band, channel number, and the like of another transponder. , The transponder other than the selected transponder can be selected from the predetermined number of transponders corresponding to the satellite wave S1. If one transponder can be selected in this way, all the transponders mounted on the communication satellite 3 can be selected. As a result, a plurality of transponders that relay the satellite wave S1 transmitted from another satellite ground station 2 can be selected. Can also be selected.

In practice, the digital broadcasting system 1 shown in FIG.
, The satellite waves S1A to S1N transmitted from the plurality of satellite ground stations 2A to 2N include, as a transport stream defined by the MPEG2 system, the occupied frequencies of all the transponders mounted on the communication satellite 3. Information such as band and channel number is transmitted by satellite waves S1A to S1.
N: Program specification information PSI (Program Specific Information) included in the MPEG2 system constituting N
Network information table N of the four tables
Written in IT (Network Information Table).

In the above configuration, the receiving device 5 of the digital broadcasting system 1 includes a plurality of satellite ground stations 2A to 2A.
Satellite waves S1A to 2N transmitted via the communication satellite 3
When receiving S1N, the transponder 4 having the intermediate frequency closest to the initial receiving frequency is selected by searching for the initial receiving frequency of the satellite wave S1 having the lowest carrier frequency.

Subsequently, with respect to the transmission coded data based on the satellite wave S1 obtained via the selected transponder 4, the receiving apparatus 5 searches the symbol rate R2 within a demodulatable range, and then performs Viterbi decoding. By searching the convolutional coding rate R1 within a possible range, the transmission coded data can be restored as a transport stream.

Further, the receiving apparatus 5 selects all transponders other than the transponder 4 already selected from the predetermined number of transponders 4 corresponding to the received satellite wave S1, based on the restored transport stream. As a result, all other transponders 4
The symbol rate R2 and the convolutional coding rate R1 can be searched for the transmission coded data based on the satellite wave S1 obtained through the above-described method, and the entire received satellite wave S1 can be retrieved as a transport stream. As can be restored.

Thus, when receiving the satellite waves S1A to S1N transmitted from the plurality of satellite ground stations 2A to 2N, the user sets the carrier frequency of the satellite wave S1 for each of the satellite waves S1A to S1N. There is no need to adjust and select a corresponding transponder, or to convert the satellite wave transmission method, so that automatic reception is possible.

According to the above configuration, a plurality of satellite ground stations 2
Satellite wave S1 transmitted from A to 2N via communication satellite 3
When receiving A to S1N, first receive the received satellite wave S1.
The transponder 4 having the intermediate frequency closest to the carrier frequency is selected, and then the symbol rate R2 is searched within the demodulatable range for the transmission coded data based on the satellite wave S1 obtained via the transponder 4. After that, the convolutional coding rate R1 is searched within the Viterbi-decoding range, and the transmission coded data is restored as a transport stream, so that the user can select a transponder for each satellite wave and The trouble of converting the transmission method of the satellite wave can be omitted, and the receiving device 5 which can greatly improve the usability can be realized.

In the above-described embodiment, a case has been described in which the present invention is applied to the receiving device 5 of the digital broadcasting system 1. However, the present invention is not limited to this. If it is possible to receive each satellite wave transmitted according to various transmission schemes and convert the received satellite wave into a data stream based on the corresponding transmission scheme, the present invention is applied to various other receiving apparatuses. be able to.

Further, in the above-described embodiment, after searching for the carrier frequency of the received satellite wave, as a selecting means for selecting a transponder having a center frequency closest to the searched carrier frequency from a plurality of transponders, The case where the tuner 41 and the CPU 42 in the receiving device 5 are applied has been described. However, the present invention is not limited to this, and various other configurations can be applied as the selecting means. When searching for the carrier frequency of the received satellite wave, the tuner 4
Although the case where the search is sequentially performed from the lowest frequency that can be set in 1 has been described, the search may be sequentially performed from the highest frequency or a predetermined intermediate frequency as long as the range can be set in the tuner 41.

Further, in the above-described embodiment, after the transmission system of the satellite wave transmitted by relaying the selected transponder is searched, the data stream (transport stream) based on the transmission system searched for the satellite wave is searched. The CPU in the receiving device 5 serves as a conversion unit for converting
42 and the case where the demodulation unit 45 is applied,
The present invention is not limited to this, and various other configurations can be applied as conversion means. Also, a case has been described in which, when searching for the satellite wave transmission system (symbol rate R2 and convolutional coding rate R1), the decoding unit 45 searches sequentially from the lowest value that can be demodulated and decoded. As long as the range can be demodulated and decoded by the unit 45, the search may be performed sequentially from the highest value or a predetermined value in the middle.

Further, in the above embodiment, the CPU 42 and the demodulation unit 45 as the conversion means describe the transmission path information of the data stream (transport stream) in the transport stream specified by the MPEG2 system. The case where the network information table NIT described above is applied has been described, but the present invention is not limited to this, and all transponders mounted on the communication satellite 3 can be selected by selecting one transponder. If such information is described in the data stream, various information other than NIT can be applied as the transmission path information.

Further, in the above-described embodiment, as a satellite wave transmission system, MPEG2 conforming to the DVB standard is used.
In addition to the application of the MPEG-2 system, each of the satellite ground stations 2A to 2A
Although the case where the convolutional coding rate R1 and the symbol rate R2 are set for each N has been described, the present invention is not limited to this, and is set for each of the satellite ground stations 2A to 2N for the satellite waves S1A to S1N. If the receiver 5 can convert the satellite waves S1A to S1N as a data stream, various other transmission schemes may be applied.

[0056]

As described above, according to the present invention, for each satellite wave transmitted from a plurality of satellite ground stations according to a predetermined transmission method, a predetermined number of satellite relays having mutually different occupied frequency bands are provided. And a receiving method for receiving each satellite wave by relaying the corresponding predetermined number of satellite transponders. In the receiving apparatus and the receiving method, any one of the satellite waves transmitted from the plurality of satellite transponders via the satellite is selected. In receiving the satellite wave, the user can adjust the carrier frequency of the satellite wave to select a corresponding satellite transponder, and can avoid the complexity of converting the satellite wave transmission method, and thus can be avoided. A receiving device and a receiving method that can significantly improve the usability can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an overall configuration of a digital broadcasting system according to an embodiment.

FIG. 2 is a block diagram showing a configuration of each satellite ground station according to the present embodiment.

FIG. 3 is a block diagram showing a configuration of a transmission line encoding unit in the transmission device shown in FIG.

FIG. 4 is a block diagram showing a configuration of an internal encoder in the transmission path encoder shown in FIG. 3;

FIG. 5 is a schematic diagram for explaining an occupied frequency array of a transponder.

FIG. 6 is a block diagram showing a configuration of a receiving device according to the present embodiment.

FIG. 7 is a flowchart for explaining a transponder selection processing procedure;

FIG. 8 is a flowchart for explaining a transport stream restoration processing procedure;

[Explanation of symbols]

1 ... Digital broadcasting system, 2A-2N ... Satellite ground station, 3 ... Communication satellite, 4 ... Transponder, 5 ...
Receiving devices, 6A to 6M, transmitting devices, 7A to 7X, encoders, 8, 42, CPU, 9 multiplexers, 10 transmission line coding units, 11 modulation units, 12,
40 antenna device, 20 energy diffusion unit, 2
1 ... outer coding unit, 22 ... interleave processing unit, 2
3 ... Inner coding unit, 24 ... Waveform shaping unit, 41 ... Tuner, 43 ... Memory, 45 ... Demodulation unit, 46 ... Demultiplexer, 47 ... Decoder, R1 ... Convolution coding rate , R2 ... symbol rate, RT1 ... transponder selection processing procedure, RT2 ... transport stream restoration processing procedure.

Claims (4)

[Claims] A predetermined number of satellite transponders each having a different occupied frequency band are allocated to each satellite wave transmitted from a plurality of satellite ground stations according to a predetermined transmission method. In a receiving apparatus that relays and receives a predetermined number of the corresponding satellite repeaters, after searching for the carrier frequency of the received satellite wave, the carrier frequency closest to the searched carrier frequency from among the plurality of satellite repeaters is used. Selecting means for selecting a satellite repeater having a center frequency; and after searching for the transmission method of the satellite wave transmitted by relaying the selected satellite repeater, the searched transmission method for the satellite wave. Conversion means for converting the data stream into a data stream based on the data. 2. The method according to claim 1, wherein the converting means selects, based on the transmission path information of the converted data stream, a satellite selected by the selecting means from a predetermined number of the satellite repeaters corresponding to the received satellite wave. The receiving device according to claim 1, wherein a satellite repeater other than the repeater is selected. 3. A predetermined number of satellite transponders each having a different occupied frequency band are allocated to each satellite wave transmitted from a plurality of satellite ground stations according to a predetermined transmission method. A first step of searching for a carrier frequency of the received satellite wave; and a step of searching for the carrier frequency of the received satellite wave. A second step of selecting a satellite transponder having a center frequency closest to the frequency, a third step of retrieving the transmission method of the satellite wave transmitted through the selected satellite transponder, A fourth step of converting the satellite wave into a data stream based on the searched transmission method. 4. In the fourth step, based on the transmission path information of the converted data stream, out of a predetermined number of the satellite repeaters corresponding to the received satellite waves, the selected satellite relay is selected. 4. The receiving method according to claim 3, wherein a satellite transponder other than the transmitter is selected.