JP2002176634A - Transmitter and receiver for cable television - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter that transmits a satellite digital broadcast program such as a BS digital broadcast program by means of CATV, and to provide a receiver therefor. SOLUTION: The transmitter for a cable television, that uses a wired system transmission line of cable television to transmit digital data, is provided with a data division means that divides MPEG-TS digital data, which are transmission source data into a plurality of MPEG-TS form digital data at a transmission speed lower than that of the transmission source data, a multiplexer means that multiplexes null digital data with each of the divided MPEG-TS form digital data, to generate MPEG-TS form digital data at a transmission rate, in matching with the data transmission rate of the cable television, digital modulation means that uses the respectively generated MPEG-TS form digital data to digitally modulate a carrier thereby generating digitally modulated waves, and a signal combining means that applies frequency multiplexing to the digitally modulated waves, to transmit the result to the wired system transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable television for frequency multiplexing digital data transmitted through a radio transmission line such as satellite broadcasting using a cable transmission line of a cable television (hereinafter referred to as CATV). And a receiving device.

[0002]

2. Description of the Related Art For digital transmission of CATV, 1
Technical report of the Institute of Television Engineers of Japan (vol. 19, No. 42) published on September 21, 995, pp. 19 to 24, "Telecommunications Technology Council Interim Device Digital Wired Television Broadcasting Transmission Experiment" I have. According to this report,
A transport stream in which digital data such as an image compressed by a digital image compression technique called MPEG-2 (MPEG-2) is multiplexed with a transport stream (hereinafter referred to as TS) is a data series in a format called 29.1 per second.
Signal processing such as Reed-Solomon error correction is performed on digital data of 62 megabits (29.162 Mbps),
The signal is modulated by a digital modulation technique called 64QAM (64-level quadrature amplitude modulation) and transmitted to a CATV transmission line at a transmission rate of 31.644 megabits per second (31.644 Mbps).

[0003] As an apparatus for distributing multi-channel digitized video input to a digital CATV, there is satellite digital television broadcasting. Nikkei Electronics, September 2, 1996 issue 149
As described in the paper "The First Digital Satellite Broadcasting to Achieve Near 70 Multi-Channels" in this page, a plurality of digitally compressed (MPEG2) programs and data are packet-multiplexed, scrambled, and corrected and encoded. The transmitted single TS is transmitted by QPSK digital modulation. A remultiplexing apparatus that remultiplexes digital data composed of a plurality of bit streams such as a digital broadcasting service using a single TS is disclosed in Japanese Patent Application Laid-Open No. H10-41909.
Is shown in According to this publication, a single TS is 18
It is composed of an 8-byte TS packet.
It is shown that it consists of 84 bytes of packet data and 4 bytes of packet header. By re-editing and transmitting program control information etc. in the packet header in re-multiplexing, it is possible to receive data from multiple broadcasters at the receiving terminal. At the same time.

On the other hand, in a newly planned BS digital broadcast, transmission channel 1 of the conventional BS analog broadcast is used.
It plans to transmit not only a plurality of digitized conventional standard television broadcasts but also high-definition television broadcasts to channels. Regarding the transmission of BS digital broadcasting, see the journal of the Visual Media Society of Japan (vol.
52 No. 11 1998) "B
S Digital Broadcasting System and Equipment ". BS
Digital broadcasting has a transmission speed of about 60 Mbps,
A plurality of TSs (hereinafter, a plurality of TSs) can be used by using a plurality of modulation schemes in one transponder (one transponder) and by providing a TS for video, audio, data, and the like with a frame configuration.
S) in a new data format so that it can be transmitted. In this data format, a transmission multiplex control signal (hereinafter, referred to as a TMCC signal) is used for transmitting modulation information in a frame and control information of a configuration of a plurality of TSs. According to Ordinance No. 57 of the Ministry of Posts and Telecommunications, the TMCC signal is divided and transmitted for each frame (= 48 slots, 1 slot = 204 bytes) before the main signal by using the synchronization signal portion of the TS, and one superframe (= 8 frames) ) Is transmitted as a cycle. The configuration is shown in the Ministry of Posts and Telecommunications Notice No. 260, in which the transmission mode / slot information is used to select digital demodulation means, and the relative T
The correspondence between the S / slot information and the relative TS / TSID is used for selecting and outputting a desired TS ID (TSID). In addition, there are transmission / reception control information such as a change instruction number and emergency information and an extended information area.

In the conventional digital CATV technology described above, B
Since transmission and reception of multiple TS transmissions planned for S digital broadcasting were not considered, July 27, 1999
Technical Report of the Institute of Image Information and Television Engineers (vo
l. 23, no. 48), "Proposal of Multiple MPEG-TS Cable TV Multiplexing System" on pages 7 to 12, and "Report on Cable MPEG Multi-TS Transmission Experiment of Multiple MPEG-TS" on pages 13 to 18 of the same report. In these reports, N 188-byte TS packets are collected to form a multiplexed frame, and the T
A TSMF header that describes S arrangement information and the like has been proposed. According to this proposal, a plurality of TS signals can be efficiently transmitted to a cable television through BS digital broadcasting. In this proposal, a BS digital broadcast data with a transmission rate of 52.17 Mbps is transmitted as two digital CATV signals using a 6 MHz band 64QAM with a transmission rate of 29.162 Mbps, and a 12 Mbps signal with a transmission rate of 57.607 Mbps.
Digital CATV signal 1 using 64QAM in Hz band
There is a proposal to transmit by using a wave, and in both cases, insertion of a null TS for synchronization to match the difference in transmission speed between BS digital broadcasting and digital CATV, and program clock information (hereinafter referred to as “reproducing system clock” on the receiving side). , PCR information).

According to the above report, the transmission rate is 52.17 Mb.
Transmission rate of BS digital broadcast of ps (188 bytes) is 2
9.162Mbps (188 bytes) digital CAT
V is transmitted by two carrier waves. As an example, a case is shown in which repeater information of a 4TS BS digital broadcast is transmitted by two TSs each using two 64QAM signals, and an example of a frame configuration as a presentation example is shown in FIG.
FIG. In the above report, the number of packets of each TS and the transmission rate of 204 bytes including the error correction code are described, and TS1 is composed of 44 packets and 16.27048M.
bps, TS2 is 4.776452 Mbp in 8 packets
s, TS3 is 16.717584 Mbp in 28 packets
s, TS4 is 9.552905Mbps with 16 packets
It is. If the expression is described by the number of packets of each TS and the transmission speed of 188 bytes, TS1 is 44 packets and 2
4.210 Mbps, TS2 is 4.402 with 8 packets
Mbps, TS3 is 15.406 Mbps with 28 packets
s and TS4 are 8.804 Mbps in 16 packets, and the total transmission speed of TS1 and TS2 is 28.612M
bps, the total transmission rate of TS3 and TS4 is 24.21
0 Mbps. That is, the transmission rate for inserting a TSMF header of one packet into a total of 52 packets of TS1 and TS2 is set to the transmission rate of 64QAM of 29.162 Mbps.
And 1 in the total 44 packets of TS3 and TS4
The transmission speed at which the TSMF header of the packet is inserted and the null packet of the eight packets are inserted are made to match the transmission speed of 64QAM of 29.162 Mbps.

As a method of cable transmission for BS digital broadcasting, a technical report of the Institute of Image Information and Television Engineers (vol. 23, No. 4) published on July 27, 1999.
8), page 19 to page 24, "frequency conversion PSK transmission system for joint reception facilities of BS digital broadcasting". In this report, the PSK transmission on the cable transmission line is performed only by frequency conversion without converting the modulation method of the BS digital broadcast signal, and a relatively wide transmission band of 34.5 MHz is required. It is a suitable method.

[0008]

SUMMARY OF THE INVENTION The present inventor has found the following problems as a result of studying the prior art.

[0009] In these reports, there is a proposal for transmitting a BS digital broadcast on two carriers of a digital CATV in a 6-MHz band 64QAM system as a system for CATV transmission. In this method, since a TSMF header is inserted in a frame configuration in multiplexing, 28.612 Mbps is the maximum transmission rate of 1 TS in the 6-QAM bandwidth 64 QAM scheme, and a TS having a higher transmission rate is transmitted to the receiving apparatus. 6MHz to do
There was no proposal for a 64QAM band system.

[0010] In those reports, the transmission rate 2
A system capable of transmitting a TS of 8.612 Mbps or more includes a PSK transmission system and a 12 MHz band 64QAM.
However, the PSK transmission method has a wide transmission bandwidth and is difficult to operate in a company that provides cable television services. The method of 12 MHz band 64QAM is as follows.
In CATV transmission in which the frequency is allocated in units of 6 MHz, an empty channel is required in the band of two adjacent waves, and there is a difficulty in frequency allocation. In addition, the current CATV retransmits analog terrestrial television. The frequency arrangement is such that the residual sideband modulation is performed using a frequency higher by 1.25 MHz from the lower frequency end of the channel of the 6 MHz band as a video carrier. In the television receiver that receives the signal, the oscillation frequency of the local oscillator for selecting the receiving frequency is set to 58.75 MHz higher than the video carrier to be received. Even if the leakage of the local oscillator of the television receiver returns on the CATV transmission line, the frequency setting occurs at the boundary of the channel in units of 6 MHz.
The frequency is allocated so as not to damage the transmitted signal. Therefore, 12
In the system of the 64QAM in the MHz band, further measures for the channel arrangement were required.

The present invention relates to a method of converting a single MPEG-TS digital data having a transmission rate equal to or higher than that of a digital transmission system in a CATV using 64QAM digital modulation of a 6 MHz band to a satellite digital broadcast such as a BS digital broadcast. An object of the present invention is to provide a transmitting device and a receiving device for transmission.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0013]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) In a cable television transmission apparatus for transmitting digital data using a cable transmission line of a cable television, a transmission source of MPEG-TS format digital data is transmitted to a plurality of MPEG-TSs at a lower speed than the transmission source. −TS
A data dividing means for dividing the digital data into format digital data, and multiplexing the null digital data with each of the divided MPEG-TS format digital data to convert the MPEG-TS format digital data at a speed matching the data transmission speed of the cable television. Multiplexing means for generating, digital modulation means for digitally modulating a carrier with each of the generated MPEG-TS format digital data to generate a digital modulated wave, frequency-multiplexing the plurality of digital modulated waves, Signal synthesizing means for transmitting the signal to a wired transmission line, wherein the multiplexing means includes a means for transmitting the generated MPEG-T
The data is output to the digital modulation means in synchronization with the output timing of the synchronization byte of the S format digital data.

(2) In a cable television transmission apparatus for transmitting digital data using a cable transmission line of a cable television, a high-speed MPEG having a data rate higher than a data rate that can be transmitted by one carrier in the digital transmission system of the cable television. A data dividing means for dividing the TS format digital data into a plurality of low-speed MPEG-TS format digital data having a data rate equal to or less than a data rate that can be transmitted by one carrier in the cable television digital transmission system, and an output from the data dividing means. Multiple low-speed MPEG-T
A plurality of multiplexing means for multiplexing null digital data with S-format digital data and outputting MPEG-TS format digital data at a specified rate corresponding to the data rate of the digital transmission system of cable television; A plurality of digital modulating means for digitally modulating a carrier with the output MPEG-TS format digital data at a specified speed to output a digital modulated wave; and a plurality of digital modulated waves including outputs of the plurality of digital modulating means. Signal synthesizing means for frequency multiplexing and sending out to the transmission line, synchronizing the operation clocks of the plurality of multiplexing means, and synthesizing each M output from the plurality of multiplexing means.
The output timing of the synchronous byte of the PEG-TS format digital data is made uniform.

(3) In a cable television transmitting apparatus for transmitting digital data using a cable transmission line of a cable television, a high-speed MPEG having a data rate higher than a data rate that can be transmitted by one carrier by the digital transmission system of the cable television. A data dividing means for dividing the TS format digital data into a plurality of low-speed MPEG-TS format digital data having a data rate equal to or less than a data rate that can be transmitted by one carrier in the cable television digital transmission system, and an output from the data dividing means. Multiple low-speed MPEG-T
Multiple TS of the cable TV to S format digital data
A plurality of TS multiplexing means for multiplexing a plurality of TS headers of format digital data and null digital data and outputting a plurality of TS digital data having a prescribed speed corresponding to the data speed of the plurality of TS digital transmission systems of the cable television; A plurality of digital modulating means for digitally modulating a carrier with a plurality of TS digital data of a prescribed speed outputted from the plurality of TS multiplexing means and outputting a digital modulated wave; and a plurality of digital modulating means including outputs of the plurality of digital modulating means Signal synthesizing means for frequency-multiplexing the digital modulated wave and sending out to the transmission line, synchronizing the operation clocks of the plurality of TS multiplexing means, and outputting the signals from the plurality of TS multiplexing means. Output timing of at least one of the synchronization byte of digital data and / or multiple TS headers To output a large selection of the grayed.

(4) In a cable television transmitting apparatus for transmitting digital data using a cable transmission line of a cable television, a high-speed MPEG having a data rate higher than a data rate that can be transmitted by one carrier according to the digital transmission system of the cable television. Data dividing means for dividing the TS format digital data into a plurality of low-speed MPEG-TS format digital data having a data rate equal to or less than a data rate which can be transmitted by one carrier wave by the digital transmission device of the cable television; Multiple low-speed MPEG-T
Multiple TS of the cable TV to S format digital data
A plurality of TS headers of format digital data and null digital data are multiplexed to output a plurality of TS digital data having a prescribed speed corresponding to the data speed of the plurality of TS digital transmission systems of the cable television, and the data dividing means outputs the plurality of TS headers to a plurality of TS headers. A plurality of sequence number-added multiple TS multiplexing means for describing and transmitting a sequence number corresponding to the output order, and digitally convert a carrier wave with a plurality of TS digital data of a prescribed speed output from the plurality of sequence number-added multiple TS multiplexing means. A plurality of digital modulation means for modulating and outputting a digital modulated wave; and a signal synthesizing means for frequency-multiplexing a plurality of digital modulated waves including outputs of the plurality of digital modulation means and transmitting the multiplexed wave to the transmission path. Synchronizing the operation clocks of the plurality of TS multiplexing means, and No. additional plurality TS Align the output timings of a plurality TS header of the digital data outputted from the multiplexing means to output.

(5) In a cable television receiver for restoring original digital data from a signal transmitted using a cable transmission line of a cable television, a plurality of frequency-multiplexed digital modulated waves are selected from the signal. Selecting digital demodulation means for digitally demodulating MPEG-TS format digital data from the selected digital modulated wave; detecting a synchronization byte of the MPEG-TS format digital data; and performing digital demodulation based on a difference in arrival time of the synchronization byte. Time difference detection and absorption means for absorbing the arrival time difference between the plurality of MPEG-TS format digital data, and a speed higher than the MPEG-TS format digital data from the plurality of MPEG-TS format digital data from which the arrival time difference has been absorbed. Data synthesizing means for synthesizing the original digital data.

(6) In a cable television receiving apparatus for transmitting digital data by frequency multiplexing to a cable transmission line of a cable television, a plurality of digital modulated waves transmitted in a frequency multiplexed manner are transmitted to a desired plurality of digital modulated waves. Select the modulating wave and set the specified speed to match the digital modulation method.
A selection digital demodulation means for digitally demodulating PEG-TS format digital data; and a synchronization byte from the digitally demodulated MPEG-TS format digital data having a specified speed inputted thereto and from the inputted specified speed MPEG-TS format digital data. Detecting the arrival time difference between the plurality of specified speed MPEG-TS format digital data from the arrival time difference of the synchronization byte, and outputting the synchronization byte of the specified speed MPEG-TS format digital data input based on the information. And a plurality of MPs output from the time difference detection and absorption means.
Data synthesizing means for synthesizing EG-TS format digital data and returning to high-speed MPEG-TS format digital data before transmission.

(7) In a cable television receiving apparatus for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television, a plurality of TSs desired from a plurality of frequency-multiplexed and transmitted digital modulated waves are received. A plurality of selected TS separation digital demodulation means for selecting a digital modulated wave and separating a single TS from a plurality of TS digital data of a specified speed by digital demodulation conforming to the digital modulation method and demodulating MPEG-TS format digital data; Receiving the demodulated MPEG-TS format digital data, detecting a synchronization byte from the input MPEG-TS format digital data, and detecting an arrival time difference of the MPEG-TS format digital data from the arrival time difference of the synchronization byte. To synchronize the MPEG-TS format digital data input with the information. And TS time difference detecting absorption means for outputting Align the output timing of sites, the TS before transmission by combining a plurality of MPEG-TS format digital data output from the time difference detector absorption means high speed MPEG-TS
And TS data synthesizing means for returning to the form digital data.

(8) In a cable television receiver for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television, a desired plurality of digital modulated waves are transmitted from a plurality of frequency-multiplexed and transmitted digital modulated waves. A plurality of digital demodulation means for selecting a modulation wave and performing digital demodulation in accordance with a digital modulation method; and a plurality of TS data having a specified speed, which is an output of the plurality of digital demodulation means, and a plurality of TSs having a specified input speed. A plurality of TSs which detect arrival time differences between a plurality of input digital data by detecting synchronization bytes of the digital data and output the plurality of TSs at a specified speed inputted at the same timing based on the information. Synchronous time difference detection and absorption means, and a specified speed which is an output of the plurality of TS synchronization time difference detection and absorption means A plurality of TS separating means for outputting MPEG-TS format digital data by separating a single TS from a plurality of TS digital data, and combining the plurality of MPEG-TS format digital data as the plurality of TS separating means; TS data synthesizing means for returning to high-speed MPEG-TS format digital data before transmission.

(9) In a cable television receiver for transmitting digital data in a frequency multiplexed manner over a cable transmission line of a cable television, a desired plurality of digital modulated signals are obtained from a plurality of frequency-multiplexed and transmitted digital modulated waves. A plurality of digital demodulation means for selecting a modulated wave and performing digital demodulation in accordance with the digital modulation device; By detecting a plurality of TS headers of the digital data, a difference in arrival time of a plurality of input digital data is detected, and the output timing of the plurality of TS headers of a plurality of TS digital data of a specified speed inputted based on the information is output. A plurality of TS header time difference detection and absorption means, and an output of the plurality of TS header time difference detection and absorption means. A plurality of TS-separating means for outputting MPEG-TS format digital data by separating a single TS from a plurality of TS digital data having a prescribed speed, and a plurality of MPEG-TS format digital data as the plurality of TS separating means. And high-speed MPEG-T before transmission
And TS data synthesizing means for returning to S format digital data.

(10) In a cable television receiving apparatus for transmitting digital data by frequency multiplexing to a cable transmission line of a cable television, a plurality of digital modulated waves transmitted by frequency multiplexing are transmitted to a desired plurality of digital modulated waves. A plurality of digital demodulating means for selecting a modulated wave and performing digital demodulation conforming to the digital modulation apparatus; and a plurality of digital TS demodulated at a specified speed, wherein the plurality of digital TS data at a specified speed are inputted. The transmitting side decodes the sequence number of the digital data multiplexed in the plurality of TS headers from the data, detects the arrival time difference based on the sequence number, and aligns the output timings of the plurality of TS digital data of the specified speed inputted with the information. Output multiple T
S header sequence number decoding time difference detection and absorption means, and a plurality of means for separating a single TS from a plurality of TS digital data at a specified speed from the plurality of TS header sequence number decoding time difference detection and absorption means and outputting MPEG-TS format digital data. T
S separating means and a plurality of Ms as the plurality of TS separating means.
TS data combining means for combining PEG-TS format digital data and returning to high-speed MPEG-TS format digital data before transmission.

According to the above-mentioned means, digital data is separated on a cable transmission line such as a cable television, frequency-multiplexed by a plurality of digital modulation units, and transmitted to the transmission line. The original data can be obtained by synthesizing the plurality of digital data obtained by the data synthesizing means by the data synthesizing means, so that a large amount of digital data can be transmitted effectively, and the time difference detecting and absorbing means on the receiving side can be transmitted. The difference between the arrival times of multiple digital data is detected and absorbed, so that the original data can be obtained even if there is a processing time difference between multiple digital modulation means, transmission lines transmitted by frequency multiplexing, or multiple selective digital demodulation means. It becomes possible.

Further, since data can be transmitted in the form of a transport stream in which digital data such as an image compressed by MPEG-2 is multiplexed, large data required for future digital broadcasting such as three-dimensional video is required. It is possible to effectively transmit a large amount of digital data.

Furthermore, when transmitting to a cable television, since transmission is performed in a plurality of 6 MHz bands at 64 QAM, the leakage of the local oscillator of the television receiver due to the current analog terrestrial television retransmission in the cable television is caused on the CATV transmission path. Even if it returns to, it is not affected and the bandwidth of the transmission path can be utilized to the maximum.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments (examples) of the present invention.

In all the drawings for describing the embodiments of the present invention, components having the same function are denoted by the same reference numerals, and their repeated description will be omitted.

(Embodiment 1) FIG. 1 is a configuration diagram showing a transmission device and a reception device of a cable television according to Embodiment 1 of the present invention, and shows a configuration example in the case of transmitting a satellite digital broadcast by CATV. In FIG. 1, 1 is a transmitting device, 2
Is a receiving device, 3 is a transmission line, 10 is a satellite broadcast receiving antenna, 11 is a satellite digital receiver, 12 is a data division circuit, 13a and 13b are multiplexing circuits, and 14a and 14b are 6
4QAM modulation circuit, 15 is a frequency multiplexing circuit, 21a, 2
1b is a frequency selection circuit, 22a and 22b are 64QAM demodulation circuits, 23 is an MPEG-TS synchronous byte time difference detection and absorption circuit, 24 is an MPEG-TS data synthesis circuit, 25 is an MPEG-TS packet separation circuit, and 26 is an MPEG video decoder circuit , 27 are audio decoder circuits, 28
Is a display device on the receiving terminal side, 101 is a digital demodulation / decoding circuit, 131a and 131b are packet combining circuits, 132
a is a clock synchronization generation circuit; 132b is a clock synchronization transfer circuit; 133a and 133b are speed comparison circuits;
Reference numerals a and 134b denote null packet generation circuits. In the first embodiment, only main functional units are shown, and peripheral circuit blocks such as a control microcomputer are omitted.

In the transmitting device 1, the satellite broadcast receiving antenna 1
The modulated signal of the satellite digital broadcast received by 0 is
Satellite digital receiver 1 in transmitter 1 by cable
A single MPEG-TS digital data transmitted by digital satellite demodulation of a channel selected by the digital demodulation / decoding circuit 101 in 1 and subjected to transmission path decoding processing such as error correction and energy spreading is obtained. Japanese satellite digital broadcasting includes CS digital broadcasting and BS digital broadcasting. Since CS digital broadcasting is broadcasted by a single TS, this means that the TS is output from the digital demodulation / decoding circuit 101. In addition, BS digital broadcasting is broadcast in a plurality of TSs, and in that case, one TS in the TS is output from the digital demodulation / decoding circuit 101.

The single MPEG-TS digital data obtained by the digital demodulation / decoding circuit 101 is divided into single MPEG-TS digital data by the data division circuit 12, and is added to the multiplexing circuits 13a and 13b. In the speed comparison circuits 133a and 133b, the multiplexing circuits 13a and 13
clock synchronization generation circuit 1 based on the operation speed of b
32a or the transmission speed information of the clock synchronous transfer circuit 132b and the divided MPE from the data division circuit 12.
The speed information is compared by comparing the speed information of the G-TS digital data, a speed error signal is obtained, and null packet generation circuits 134a and 134b are generated according to the speed error.
From the packet combining circuits 131a and 131
In addition to 1b, 6
The signals are sent to the 4QAM modulation circuits 14a and 14b. The digital data having the prescribed transmission rate is transmitted to the 64QAM modulation circuit 14.
The signals are subjected to 64QAM multi-level digital modulation at a and 14b, frequency-multiplexed with another modulated wave by the frequency multiplexing circuit 15, and transmitted to the transmission line 3. A clock signal or MPEG-TS is transmitted from the clock synchronization generation circuit 132a of the multiplexing circuit 13a to the clock synchronization transfer circuit 132b of the multiplexing circuit 13b.
Multiplexing circuit 1 by sending the timing of the synchronization byte
The synchronous operation of 3a and 13b is performed.

The receiving device 2 receives a plurality of digitally modulated waves transmitted to the transmission path 3 as inputs and outputs a plurality of frequency selecting circuits 2 from the plurality of digitally modulated waves.
1a, 21b, a required modulated wave is selected, and the selected 64QAM modulated wave is converted to a 64QAM demodulation circuit 22.
a, 22b, and a 64QAM demodulation circuit 22a, 22
b) Detect the time difference of arrival of the MPEG-TS synchronization byte inside the divided MPEG-TS digital data from b and absorb the time difference to synchronize the divided MPEG-TS digital data on the transmission side. MPEG-
It outputs to the TS data synthesis circuit 24. In the MPEG-TS data synthesis circuit 24, the divided MPEG-TS
By synthesizing the TS digital data, it is possible to return to the single digital data in the MPEG-TS format, which is the same data as that input to the data division circuit 12 on the transmission side. Single MPEG-TS format digital data is MPE
G-TS packet separation circuit 25 inputs MPEG
The TS packet separation circuit 25 separates the video and audio packets, the video packet data is decoded by the MPEG video decoder 26, and the audio packet is
The video signal and the audio signal are obtained by being decoded by the EG audio decoder 27 and input to the display device 28.

In the first embodiment, the digital data transmitted by satellite digital broadcasting from the satellite digital receiver 11 in the transmitting apparatus 1 is in the MPEG-TS format, and is one transponder having a 34.5 MHz band in the BS digital broadcasting. Transmission rate of 52.17 Mbps, but the transmission rate of 64.times.AM in the 6 MHz band of CATV is 29.162.
Mbps, the total transmission speed is 58.324 Mbps using two systems of 64 QAM in a 6 MHz band.
Transmission as s can be realized. Therefore, a single MPEG-TS digital data will be used in future satellite digital broadcasting.
Even if a service of 9.162 Mbps or more is implemented, CA
There is also an advantage that TV transmission is possible.

Further, since the MPEG-TS synchronous byte time difference detection / absorption circuit 23 can detect and absorb the arrival time difference of a plurality of MPEG-TS digital data from the 64QAM demodulation circuits 22a and 22b, the multiplexing circuits 13a, 13b and 6
The transmission path 3 or 6 transmitted by the processing time of a plurality of digital devices of the 4QAM modulation circuits 14a and 14 and frequency multiplexing.
The original data can be obtained even if a processing time difference occurs between a plurality of devices of the 4QAM demodulation circuits 22a and 22b.

Further, in the first embodiment, a plurality of 6MH
Since transmission is performed in the z-band 64QAM, the current analog terrestrial television retransmission in cable television requires:
Even if the leakage of the local oscillator of the television receiver returns to the CATV transmission path, it is not affected and the band of the transmission path can be utilized to the maximum.

In the transmitting apparatus 1 shown in FIG. 1, a single MPEG-TS digital data transmitted by satellite digital broadcasting is
By reducing the transmission speed by dividing into digital data,
64QA that converts two lines of single MPEG-TS digital data whose transmission speed is reduced into two lines of digital modulated waves
It is added to the M modulation circuits 14a and 14b. These digital modulated waves are frequency-multiplexed by the frequency multiplexing circuit 15 and transmitted to the transmission line 3. In the receiving device 2, as a reverse process of the process, the single MPEG-TS digital data of two systems from the 64QAM demodulation circuits 22a and 22b is transmitted to the MPE.
When returning to the original single MPEG-TS digital data synthesized and transmitted by the G-TS data synthesis circuit 24, the MP-TS
The EG-TS synchronous byte time difference detection / absorption circuit 23 detects the arrival time difference between two sets of single MPEG-TS digital data and absorbs the time difference. FIG. 2 shows a digital data processing process inside the transmitting apparatus 1 according to FIG.
FIG. 3 is a conceptual diagram of frequency multiplexing on the transmission line transmitted to the transmission line 3, and FIG.

FIG. 2 shows transmitting apparatus 1 according to the first embodiment of the present invention.
FIG. 2 is a diagram showing an example of a data signal sequence in the digital data processing process inside of FIG. 2, where 200 is an MPEG-TS digital data sequence, 201 is a synchronization byte, 202 is digital data,
03 is an error correction code, 210a and 210b are divided data, and 211a and 211b are transmission data. However,
FIG. 2 illustrates a frame configuration example of a single MPEG-TS digital data to be processed.

The MPEG-TS digital data 200 is a single MPEG-TS digital data including an error correction code, and its frame structure is such that a first byte is a synchronization byte 201 (numerical value is 0x47) and 187 bytes of digital data. 188 bytes including the data 202 are MPEG-
This is the actual data of the TS. When performing 64QAM transmission in the 6 MHz band of CATV, the transmission speed is 29.1.
It corresponds to 62 Mbps. The 204 bytes obtained by adding the 16-byte error correction code 203 to the 188 bytes are single MPEG-TS digital data transmitted by digital broadcasting, and an error correction code is added when performing 64QAM transmission in a 6-MHz CATV band. Transmission rate is 31.6
44 Mbps. In addition, 188 bytes of MPEG-
The TS includes a plurality of video and audio data, and in order to identify them, 4 bytes including the first 1-byte synchronization byte 201 may be described as a packet header and 184-byte packet data. Embodiment 1
The synchronization byte and 187 bytes of data related to the above will be described.

A single MP transmitted by digital satellite broadcasting
The MPEG-TS digital data 200, which is EG-TS digital data, is divided by the data dividing circuit 12 into divided data 210a and divided data 210b, and the data is expanded on the time axis and converted into transmission data 211a and transmission data 211b. , And multiplexing circuits 13a and 13b. As shown, the divided data 210a and the divided data 210b are simply MPEG-TS digital data 20.
Since only the data is divided into 0, each data is bursty like data 1, blank, data 3 or blank, data 2, blank, and the instantaneous transmission speed is not reduced. The transmission speed is halved by expanding the data on the time axis during the blank time, and the data is divided into transmission data 211a and transmission data 211b. Note that a memory circuit is generally used for time axis expansion, and expansion is performed after data arrives, so that the expansion start times of data 1 and data 2 are generally different from each other. The time axis expansion of the data 1 is performed in synchronization with the time axis expansion of the data 2 of the divided data 210b.
a and transmission data 211b are obtained. For this purpose, the clock signal and the timing of the synchronization byte of MPEG-TS are transmitted from the clock synchronization generation circuit 132a of the multiplexing circuit 13a to the clock synchronization transfer circuit 132b of the multiplexing circuit 13b. In the multiplexing circuit 13a and the multiplexing circuit 13b,
Null packets are inserted in order to obtain digital data having a prescribed transmission speed. The null packets also have the same structure of 204 bytes of MPEG-TS digital data.

FIG. 3 is a conceptual diagram of frequency multiplexing on a transmission line according to the present invention. 1 represents a signal transmitted to the transmission path 3 in FIG. 1, 31 is the entire band of the frequency multiplex transmission path, and 32 is 64Q
A digital modulated wave output from the AM modulation circuit 14a,
Reference numeral 33 denotes a digital modulated wave output from the 64QAM modulation circuit 14b. As is apparent from FIG. 3, in the transmitting apparatus according to the first embodiment, the digital modulated wave 32 output from the 64QAM modulation circuit 14a and the 64QAM
Digital modulated wave 3 output from AM modulation circuit 14b
3 can be transmitted within the entire band 31 of the frequency multiplex transmission line output from the frequency multiplexing circuit 15.

FIG. 4 is a diagram showing an example of a data signal sequence in a digital data processing process inside the receiving apparatus 2 according to FIG. 1 of the present invention. 401 is a synchronization byte, 402 is digital data, 403 is an error correction code, 411a and 411b are received MPEG-TS digital data, 412a and 4
12b is the data 413a and 41 which are absorbed by the arrival time difference.
3b is time axis compressed data and 414 is synthetic data.

Although there is a time difference T between the arrival times of the received MPEG-TS digital data 411a and 411b,
The MPEG-TS synchronous byte time difference detection / absorption circuit 23 detects and absorbs the difference between the synchronous byte arrival times, thereby obtaining the data 412a and 412b absorbed by the arrival time difference. It becomes time axis compressed data 413a and 413b. At that time, a blank time is provided between data 1 and data 3 in consideration of combining.
It is managed by the time of the synchronization byte so that data 2 can be synthesized in the blank time. Time axis compressed data 413a and 413
b is combined by the MPEG-TS data combining circuit 24 to become combined data 414. This combined data 414 is the MPE
It is added to the G-TS packet separation circuit 25 and separated into video and audio packets. At this time, null packets were added on the transmitting side to match the transmission speeds of the two systems of 64 QAM in the 6 MHz band of satellite digital broadcasting and CATV, but the null packets were multiplexed in the form of MPEG-TS packets. Since it is ignored by the MPEG-TS packet separation circuit 25, there is no need to delete null packets multiplexed on the transmitting side on the receiving side.

MPE for detecting difference in arrival time of synchronization byte
The range in which the G-TS synchronization byte time difference detection and absorption circuit 23 can absorb time difference detection is half the period during which a synchronization byte appears.
Since the period of data 1 is 204 bytes, 204 × 8
Since it is bit data and one bit of 31.644 Mbps is about 254 ns, the period of 204 bytes is about 51.5 μs. Even though the arrival times of the data 1 and the data 2 are different, about 25.
If it is up to 8 μs, it is possible to detect the arrival time difference of the synchronization byte. As a result, in the case of the same cable television transmission, the original data can be obtained even if there is a processing time difference between the transmitting device 1 and the receiving device 2. If it is longer than this, detection is erroneous because the context of the data is unknown.

As a result, it is possible to transmit more data than can be transmitted by each carrier. CATV
The transmission rate in 64QAM of the 6 MHz band is 31.64.
4 Mbps, and the transmission rate excluding redundant data for error correction is 29.162 Mbps. However, as shown in the first embodiment of the present invention, the 6 MHz band 64Q
58.32 when AM signals are frequency-multiplexed by two systems.
4 Mbps data can be transmitted. If so, BS digital broadcasting satellite digital broadcasting, 34.5
52.17Mb with one transponder with MHz band
ps, and this signal is a single MPE
Even G-TS digital data can be transmitted by CATV. Since the high-definition video compressed by MPEG-2 is about 20 Mbps, two programs of the high-definition video can be transmitted at a transmission speed of 52.17 Mbps.
Here, when a three-dimensional image is considered using multi-view digital data, the capacity of an image captured by 20 eyes is about 20 times, and it is considered that a high-definition 3D image requires about 400 Mbps. Since the correlation between the video images captured by the above method is high, assuming that the image data can be reduced to about one tenth of that by using digital image compression technology, it will be about 40 Mbps. In such a case, in the BS digital broadcasting, one transponder is capable of broadcasting a high-definition three-dimensional video by frequency multiplex transmission using two systems of 64 QAM signals of 6 MHz band shown in the first embodiment.

As described above, in the transmission apparatus 1 and the reception apparatus 2 of the cable television according to the first embodiment, the data division circuit 12 which constitutes the transmission apparatus 1 of the cable television and functions as the data division means includes, for example, a satellite digital signal. High-speed MP transmitted by satellite digital broadcasting from receiver 11
The EG-TS format digital data is divided into two low-speed MPEG-TS format digital data which are equal to or lower than a data rate that can be transmitted by one carrier wave of a cable television digital transmission system. Next, the multiplexing circuits 13a and 13b functioning as multiplexing means are divided into low-speed MPEG-T
Null digital data in the form of an MPEG-TS packet is multiplexed with each of the S-format digital data to generate MPEG-TS format digital data at a speed matching the cable TV data transmission speed. Thereafter, 64QAM modulation circuits 14a and 14b functioning as digital modulation means
Are generated by the multiplexing circuits 13a and 13b.
A carrier wave is digitally modulated with PEG-TS format digital data to generate a digital modulated wave, and a frequency multiplexing circuit 15 functioning as a signal synthesizing means frequency-multiplexes the generated digital modulated wave to a transmission line (wired transmission line). ) Send to 3.

On the other hand, in the receiving device 2 of the table television,
Frequency selection circuit 2 functioning as selective digital demodulation means
1a, 21b first select a plurality of frequency-multiplexed digital modulated waves from the signal on the transmission path 3, and then select a 64QAM demodulation circuit 22a,
22b digitally demodulates, from the selected digital modulated wave, two low-speed MPEG-TS format digital data which are equal to or lower than a data rate that can be transmitted by one carrier of a digital transmission system of cable television. Next, the MPEG-TS synchronization byte time difference detection and absorption circuit 23 functioning as time difference detection and absorption means detects the synchronization byte 401 of the two MPEG-TS format digital data demodulated by the 64QAM demodulation circuits 22a and 22b, and Two MPEG-TS digitally demodulated from the byte arrival time difference T
Absorb the arrival time difference T of the formal digital data. Thereafter, the MPEG-TS data synthesizing circuit 24 functioning as a data synthesizing means operates at the low speed 2 where the arrival time difference T is absorbed.
From the MPEG-TS format digital data to the MPE
The original digital data at a higher speed than the G-TS format digital data, that is, the high-speed MPEG-TS format digital data transmitted by the satellite digital broadcast from the satellite digital receiver 11 is synthesized.

As described above, in the transmission apparatus 1 of the cable television according to the first embodiment, for example, the high-speed MPEG-
A signal sequence of MPEG-TS, which is TS format digital data, is divided into two of odd-numbered packets and even-numbered packets, and the divided MPEG-TS format digital data is matched with the data transmission speed of cable television. The two digital data of the MPEG-TS format, that is, the digital data of the MPEG-TS format for two channels at a rate matching the data transmission rate of the cable television, and modulate each with a different carrier wave and output to the transmission line 3; The receiver 2 demodulates two channels of MPEG-TS format digital data modulated by different carrier waves, and returns the original digital data, that is, the satellite digital receiver 1.
High-speed MPE transmitted by satellite digital broadcasting from 1
Since it combines G-TS format digital data, it can be used for satellite digital broadcasting such as BS digital broadcasting.
A single MPEG-TS digital data having a transmission rate higher than that of the digital transmission system in ATV
ATV transmission is possible.

(Embodiment 2) FIG. 5 is a configuration diagram showing a transmission device and a reception device of a cable television according to Embodiment 2 of the present invention, and shows a configuration example in the case of transmitting a satellite digital broadcast by CATV. In FIG. 5, 51a and 51b are multiple TS multiplexing circuits, 52a and 52b are multiple TS demultiplexing circuits, 511a and 511b are packet combining circuits, and 512a.
Is a clock synchronization generation circuit, 512b is a clock synchronization transfer circuit, 513a and 513b are speed comparison circuits, 514a,
514b is a null packet generation circuit, 515a, 515b
Is a multiple TS header generation circuit.

In the second embodiment, the reference
"Technical Report of the Institute of Image Information and Television Engineers (Vol.23, No.48) published on March 27, Vol.23, No.48" Multi-TS on CATV described in "Multi-MPEG-TS Cable TV Transmission Experiment"
It adopts a transmission method. The multi-TS transmission method in CATV shown in this document 1 has a large transmission capacity and requires a single repeater to retransmit a BS digital broadcast broadcasted by a plurality of MPEG-TSs by a plurality of MPEG-TSs on a cable television. This is a proposed transmission system that can be operated by cable television stations, with a part of the regulations of the Cable Television Broadcasting Act enforced by the Ordinance of the Ministry of Posts and Telecommunications on August 14, 2000. In this multi-TS transmission method, an MPEG-TS of 188 bytes starting with a synchronization byte of the MPEG-TS
(52 in the example shown in FIGS. 17 and 18), and a 188-byte MPEG-TS format header with a synchronization byte called a TSMF header is provided at the beginning of the N-th. 17 (in the example of FIGS. 17 and 18), a frame structure is formed. According to this transmission system, each repeater is operated by two or more TSs.
Each program of digital broadcasting can be retransmitted on one channel of a 6-MHz band of cable television.

In the second embodiment, the transmission is carried out by the multiple TS transmission method, and in the same manner as in the first embodiment, the transmission is synchronized by the MPEG-TS synchronization byte.

In the transmitting device 1, a single MPEG-TS digital data is divided by the data dividing circuit 12 to
It is added to the S multiplexing circuits 51a and 51b. In the multiplexing circuits 51a and 51b, a plurality of TS header generation circuits 513a,
513b (in the above report, TSMF
In addition to the speed comparison circuit 513a,
At 513b, the transmission speed information of the clock synchronization generation circuit 512a or the clock synchronization transfer circuit 512b based on the operation speed of the multiplexing circuits 51a and 51b and the speed information of the divided MPEG-TS digital data from the data division circuit 12 , A speed error signal is obtained, a null packet from the null packet generating circuits 514a, 514b is added to the packet combining circuits 511a, 511b in accordance with the speed error, and a prescribed transmission is performed. 64QAM modulation circuit 1 as digital data of speed
4a and 14b. In the second embodiment, since a plurality of TS methods are used, other MPEG-TS
It is easy to multiplex digital data, and it is also possible to multiplex other MPEG-TS digital data instead of a null packet. In addition, since a plurality of TS headers include an area in which data such as a start flag for an emergency alert broadcast can be multiplexed and transmitted in addition to information for separating TSs of a plurality of TSs, an emergency alert broadcast transmitted by BS digital broadcast is provided. It is also possible to carry out CATV transmission of information such as a start flag.

The receiving device 2 receives a plurality of digitally modulated waves transmitted to the transmission path 3 as inputs, and outputs a plurality of frequency selecting circuits 2 from the plurality of digitally modulated waves.
A required modulated wave is selected by 1a and 21b, and the selected 64QAM modulated wave is converted to a 64QAM demodulation circuit 22.
Since the digital data demodulated by a and 22b is in the form of a plurality of TSs, the TSs are separated by the plurality of TS separation circuits 52a and 52b to form single MPEG-TS digital data. M
The PEG-TS synchronous byte time difference detection and absorption circuit 23 stores the MPEG-TS inside the MPEG-TS digital data divided on the transmission side from the plurality of TS separation circuits 52a and 52b.
An MPEG-TS data synthesizing circuit 2 which synchronizes the MPEG-TS digital data divided on the transmission side by detecting the arrival time difference of the TS synchronization byte and absorbing the time difference.
4 is output. In the multiple TS separation circuits 52a and 52b,
The transmitting side can also decode and output emergency flag broadcast start flag information, which is information multiplexed in a plurality of TS headers.

Note that the multiple TS header generation circuits 513a, 513a,
An example of the multiple TS header information 513b is described in Document 1 as described above.

The digital data processing process inside the transmitting device 1 according to the second embodiment will be described with reference to FIG. 6, and the digital data processing process inside the receiving device 2 will be described with reference to FIG.

FIG. 6 shows transmitting apparatus 1 according to the second embodiment of the present invention.
FIG. 5 is a diagram showing an example of a data signal sequence in a digital data processing process inside the device. A description will be given of an example of a frame configuration of single MPEG-TS digital data to be processed. 611a, 61
1b is a plurality of TS transmission data, and the same numbers as those in FIG. 2 indicate the same data. Transmission data 211a and transmission data 21
By inserting a plurality of TS headers into 1b, a plurality of TS transmission data 611a and a plurality of TS transmission data 611b are obtained, and output from the plurality of TS separation circuits 52a and 52b.

FIG. 7 shows a receiving apparatus 2 according to the second embodiment of the present invention.
FIG. 5 is a diagram showing an example of a data signal sequence in a digital data processing process inside the device. 701 is a synchronization byte, 702 is digital data, 703 is an error correction code, 711a and 711b are received MPEG-TS digital data of a plurality of TSs,
712a and 712b are single MPEGs after separation of multiple TSs
-TS digital data, 713a and 713b are data with the arrival time difference absorbed, 714a and 714b are time axis compressed data, and 715 is synthetic data.

The MPEG-TS digital data 7 of a plurality of TSs received from the 64QAM demodulation circuits 22a and 22b
There is a time difference of T0 between the arrival times of 11a and 711b, and a single MPEG-TS digital data 712a and 712 of multiple TS separation output from the multiple TS separation circuits 52a and 52b.
Assume that there is a time difference of T1 in the arrival time of 12b. MPE
The G-TS synchronization byte time difference detection / absorption circuit 23 detects and absorbs the difference between the arrival times of the synchronization bytes to obtain data 713a and 713b whose arrival time differences have been absorbed.
The time axis is compressed to the double transmission speed and the time axis compressed data 71
4a and 714b. At this time, a blank time is provided between the data 1 and the data 3 in consideration of the combining, and the time is managed by the synchronization byte so that the data 2 can be combined in the blank time. The time axis compressed data 714a and 714b are combined by the MPEG-TS data combining circuit 24 to become combined data 715. This combined data 715 is MPEG-
It is added to the TS packet separation circuit 25.

According to the second embodiment, 6 MHz band 6 MHz
The transmission rate can be expanded using two systems of 4QAM and MPEG
Second Embodiment In addition to the effects of the first embodiment shown in FIG.
Can transmit multiple TS header information by multiplexing.
There is also an advantage that information such as start flag information for emergency alert broadcasting sent by digital broadcasting can be transmitted by CATV.

As described above, in the transmitting apparatus 1 according to the second embodiment, for example, the data dividing circuit 12 is high-speed MPEG-TS format digital data transmitted by satellite digital broadcasting from the satellite digital receiver 11. MPEG-
A TS signal sequence is divided into odd-numbered packets and even-numbered packets, and multiplexing circuits 51a and 51b serving as a plurality of TS multiplexing units are formed from the divided MPEG-TS format digital data by a cable TV. Multiple TS headers of multiple TS format digital data and null digital data are multiplexed to generate multiple TS digital data of a specified speed that matches the data speed of the multiple TS digital transmission system of cable TV, and each is modulated by a different carrier. The signal is output to the transmission path 3, and in the receiving apparatus 2, the frequency selection circuits 21a and 21b serving as the selected TS separation digital demodulation means transmit a plurality of T signals of two channels modulated and transmitted by different carrier waves.
The S digital data modulated wave is selected, a single TS is separated from a plurality of TS digital data of a specified speed by digital demodulation conforming to the digital modulation method, and the MPEG-TS format digital data is demodulated. The MPEG-TS synchronous byte time difference detection and absorption circuit 23 detects a synchronous byte from the demodulated digital data in the MPEG-TS format and determines the MPEG based on the arrival time difference of the synchronous byte.
-Detect the arrival time difference of the TS format digital data, align the output timing of the synchronization byte of the MPEG-TS format digital data input with the information, and adjust the output timing of the original digital data, that is, the satellite digital broadcast from the satellite digital receiver 11. , Which combines the high-speed MPEG-TS format digital data transmitted by the MPT with a transmission speed higher than the transmission speed of the digital transmission system in CATV such as satellite digital broadcasting such as BS digital broadcasting.
EG-TS digital data can be transmitted by CATV.

(Embodiment 3) FIG. 8 is a configuration diagram showing a transmission device and a reception device of a cable television according to Embodiment 3 of the present invention, and shows an example of a configuration in the case of transmitting a satellite digital broadcast by CATV. In FIG. 8, reference numeral 83 denotes an MPEG-TS synchronous byte time difference detecting and absorbing circuit in a plurality of TSs.
However, in the following description, the receiving device 2 that is different from the second embodiment will be described in detail.

The digital data demodulated by the 64QAM demodulation circuits 22a and 22b are in the form of a plurality of TSs. The arrival time difference is absorbed by detecting and absorbing the difference in arrival time. The output is sent to a plurality of TS separation circuits 52a and 52b.
And separates the TS into single MPEG-TS digital data, which is output to the MPEG-TS data synthesis circuit 24.

A digital data processing process inside the transmitting device 1 according to the third embodiment will be described with reference to FIG. 9, and a digital data processing process inside the receiving device 2 will be described with reference to FIG.

FIG. 9 shows a transmitting apparatus 1 according to the third embodiment of the present invention.
9 is a diagram showing an example of a data signal sequence in a digital data processing process inside the transmission device 1. Since this transmission device 1 is the same as the transmission device 1 of the second embodiment, FIG. 9 is the same as FIG.

FIG. 10 is a diagram showing an example of a data signal sequence in the course of digital data processing inside the receiving apparatus 2 according to the third embodiment of the present invention. TS digital data,
Reference numerals 1003a and 1003b denote single MPEG-TS digital data absorbed by the arrival time difference, and 1004a and 1004.
b is time axis compressed data after the arrival time difference is absorbed and a plurality of TSs are separated, 1005 is synthesized data, and the same numbers as those in FIG. 7 indicate the same data.

There is a time difference T between the arrival times of the MPEG-TS digital data strings 711a and 711b of a plurality of TSs received from the 64QAM demodulation circuits 22a and 22b. −
The MPEG-TS of the plurality of TSs, which are added to the TS synchronization byte time difference detection and absorption circuit 83 to detect and absorb the difference between the arrival times of the synchronization bytes of the plurality of TSs and absorb the difference in the arrival time.
Digital data 1002a and 1002b
Single MPEG-TS digital data 1003a and 1003b that are added to the S separation circuits 52a and 52b, separated by a plurality of TSs, and absorbed in arrival time difference. MPEG-T
In the S data synthesizing circuit 24, the single MPEG-TS digital data 1003a and 1003 absorbed by the arrival time difference are absorbed.
b is time-axis-compressed to twice the transmission speed, the arrival time difference is absorbed, and time-axis compressed data 1004a after a plurality of TSs are separated.
And 1004b. At this time, a blank time is provided between the data 1 and the data 3 in consideration of the combining, and the time is managed by the synchronization byte so that the data 2 can be combined in the blank time. The time axis compressed data 1004a and 1004b after the arrival time difference is absorbed and a plurality of TSs are separated are combined to become combined data 1005. This composite data 1005 is MP
It is added to the EG-TS packet separation circuit 25.

According to the third embodiment, the 6 MHz band 6
The transmission rate can be expanded using two systems of 4QAM and MPEG
Third Embodiment In addition to the effects of the first embodiment shown in FIG.
Can transmit multiple TS header information by multiplexing.
As in the second embodiment shown in FIG. 5, there is an advantage that information such as emergency flag broadcast start flag information transmitted by digital broadcasting can be transmitted by CATV.

(Embodiment 4) FIG. 11 is a configuration diagram showing a transmission device and a reception device of a cable television according to Embodiment 4 of the present invention, and shows an example of a configuration in the case of transmitting a satellite digital broadcast by CATV. In FIG. 11, reference numeral 113 denotes a multiple TS header time difference detection absorption circuit. However, in the following description, the receiving device 2 that is different from the second embodiment will be described in detail.

The digital data demodulated by the 64QAM demodulation circuits 22a and 22b is in the form of a plurality of TSs. Is detected and absorbed to absorb the arrival time difference. The output is subjected to TS separation by a plurality of TS separation circuits 52a and 52b to form single MPEG-TS digital data, and MPEG-TS digital data is output.
It outputs to the TS data synthesis circuit 24.

The fourth embodiment is also a mode in which transmission is performed by a plurality of TS transmission methods. This is a mode in which a header is used as a reference for synchronization. In this embodiment, the TSMF header of Document 1 (referred to as a multiple TS header in the description of the embodiment)
It is shown that the present invention is effective even when the transmission time interval is longer than the synchronization byte and the arrival time difference to the receiving side is large.

In the fourth embodiment, a plurality of TS header time difference detecting / absorbing circuits 113 use a plurality of TS headers by using a plurality of TS headers.
In this case, the arrival time difference of the MPEG-TS digital data is detected, so that the time difference detection absorbable range can be expanded. Multiple T
In the S header, since a 204-byte packet with the synchronization byte at the beginning is at the beginning of 53 packets, the time interval at which it appears is 53 times the synchronization byte, and is about 2.76 ms. Even if the arrival times of the digital data demodulated by the 64QAM demodulation circuits 22a and 22b are shifted, up to about 1.37 ms, which is a half of the appearance time interval of the plurality of TS headers, it is possible to detect the arrival time difference of the plurality of TS headers. is there. As a result, not only the same transmission path 3 of the cable TV, but also another band processing of band division inter-station transmission such that one of two MPEG-TS digital data of a plurality of TSs is transmitted in the VHF band and the other is transmitted in the UHF band. Also, even in the case of performing a so-called cable television network distribution system in which one or more digital transmission devices are shared and supply is performed through another route, original data can be obtained.

A digital data processing process inside the transmitting device 1 according to the fourth embodiment will be described with reference to FIG. 12, and a digital data processing process inside the receiving device 2 will be described with reference to FIG.

FIG. 12 is a diagram showing an example of a data signal sequence in the course of digital data processing inside transmitting apparatus 1 according to the fourth embodiment of the present invention. Transmitting apparatus 1 according to the fourth embodiment is different from the second embodiment. 12 is the same as FIG.

FIG. 13 is a diagram showing an example of a data signal sequence in the course of digital data processing inside the receiving apparatus 2 according to the fourth embodiment of the present invention. 1301a and 1301b are received MPEG-TS digital data of a plurality of TSs, 1302
“a” and “1302b” are MPs of a plurality of TSs that have been absorbed by the arrival time difference.
EG-TS digital data, as shown in FIG. 7 or FIG.
The same numbers indicate the same data.

The arrival times of the MPEG-TS digital data strings 1301a and 1301b of a plurality of TSs received from the 64QAM demodulation circuits 22a and 22b have a time difference of T2 (longer than the case of FIG. 10). The plurality of TSs, which are added to the plurality of TS header time difference detection and absorption circuits 113 of the receiving device 2 to detect and absorb the difference in the arrival time of the plurality of TS headers of the plurality of TSs, thereby absorbing the difference in the arrival time.
MPEG-TS digital data 1302a, 1302
b, a single MP that is added to the plurality of TS separation circuits 52a and 52b, separated by a plurality of TSs, and absorbed by the arrival time difference.
It becomes EG-TS digital data 1003a and 1003b.

According to Embodiment 4, 6 MHz band 6 MHz
Use two systems of 4QAM to increase the transmission speed,
The advantage that the information such as the start flag information for the emergency alert broadcast transmitted by the BS digital broadcast based on the header information can be transmitted by CATV is the same as that of the second or third embodiment. MPE of multiple TSs using multiple TS headers in absorption circuit 113
Since the arrival time difference of G-TS digital data is detected,
There is an advantage that the absorbable range of time difference detection can be expanded.

As described above, in the transmitting apparatus 1 of the fourth embodiment, for example, the data division circuit 12 is high-speed MPEG-TS format digital data transmitted by satellite digital broadcasting from the satellite digital receiver 11. MPEG-
A TS signal sequence is divided into odd-numbered packets and even-numbered packets, and multiplexing circuits 51a and 51b serving as a plurality of TS multiplexing units are formed from the divided MPEG-TS format digital data by a cable TV. Multiple TS headers of multiple TS format digital data and null digital data are multiplexed to generate multiple TS digital data of a specified speed that matches the data speed of the multiple TS digital transmission system of cable TV, and each is modulated by a different carrier. The signals are output to the transmission path 3, and in the receiving device 2, the frequency selecting circuits 21a and 21b and the 64QAM demodulating circuits 22a and 22b serving as digital demodulating means are frequency-division multiplexed and transmitted from a plurality of digital modulated waves. Selects the modulated wave, performs digital demodulation that matches the digital modulator, and Multiple TS as a time difference detection absorbing means
If the header time difference detection and absorption circuit 113 has a
A plurality of TS headers of the digital data are detected to detect a difference in arrival time of the digital data, and based on the information, the output timings of the plurality of TS headers of the plurality of TS digital data at a specified speed are aligned, and a plurality of separating circuits 52 serving as a plurality of TS separating means.
a, 52b generates MPEG-TS format digital data by separating a single TS from a plurality of TS digital data at a specified speed, and synthesizes the separated MPEG-TS format digital data to obtain the original digital data, Since it combines high-speed MPEG-TS format digital data transmitted by satellite digital broadcasting from the satellite digital receiver 11, it exceeds the transmission speed of the digital transmission system in CATV such as satellite digital broadcasting such as BS digital broadcasting. MPEG-TS digital data having a transmission speed of CATV can be transmitted by CATV.

(Embodiment 5) FIG. 14 is a configuration diagram showing a transmission device and a reception device of a cable television according to Embodiment 5 of the present invention, and shows an example of a configuration in the case of transmitting a satellite digital broadcast by CATV. In FIG. 14, 141a, 1
41b is a sequence number added multiple TS multiplexing circuit, 142 is a multiple TS header sequence number analysis time difference detection absorption circuit, 141
1a and 1411b are packet synthesis circuits, 1412a is a clock synchronization generation circuit, 1412b is a clock synchronization transfer circuit, 1413a and 1413b are speed comparison circuits, 1414
a and 1414b are null packet generation circuits;
Reference numeral 1415b denotes a sequence number added multiple TS header generation circuit.

The fifth embodiment relates to a method of describing the sequence number of digital data divided by the data division circuit 12 on the transmitting side in the information descriptive area of a plurality of TS headers and transmitting the data. This is a proposal in which the sequence number of the digital data divided by the data dividing circuit 12 is described and transmitted in “reservation for the future” or “private data” described in the data structure of the TSMF header in Table 2.

In the transmitting apparatus 1, a single MPEG-TS digital data is divided by the data dividing circuit 12, and is added to the sequence number-added plural TS multiplexing circuits 141a and 141b. The multiplexing circuits 141a and 141b divide the data into a plurality of TS headers (referred to as TSMF headers in the above report) from the sequence number-added plural TS header generation circuits 1413a and 1413b, and the information descriptable area by the data division circuit 12 on the transmission side. The sequence number of the digital data is described and transmitted by the clock synchronization generation circuit 1412a or the clock synchronization transfer circuit 1412b based on the operation speed of the sequence number added multiple TS multiplexing circuits 141a and 141b in the speed comparison circuits 1413a and 1413b. The speed information is compared by comparing the speed information with the speed information of the divided MPEG-TS digital data from the data dividing circuit 12 to obtain a speed error signal, and a null packet generating circuit is generated according to the speed error. Packet synthesis of null packets from 1414a and 1414b Road 1411a, 1411b
In addition to 64Q as digital data of specified transmission rate
The signal is sent to the AM modulation circuits 14a and 14b.

In the receiving apparatus 2, the 64QAM demodulation circuit 22
The digital data demodulated in steps a and 22b are in the form of a plurality of TSs, and the plurality of TSs are read by the plurality of TS header sequence number analysis time difference detection / absorption circuit 142 in the form of the plurality of TSs.
Of the plurality of TS headers described on the transmitting side is analyzed to detect and absorb the difference in arrival time, thereby absorbing the difference in arrival time. The output is sent to a plurality of TS separation circuits 52a and 52b.
And separates the TS into single MPEG-TS digital data, which is output to the MPEG-TS data synthesis circuit 24.

In the fifth embodiment, the plural TS header sequence number analysis time difference detection / absorption circuit 142 analyzes the plural TS headers and the sequence numbers described in the information area on the transmission side, and the arrival of MPEG-TS digital data of plural TSs Since the time difference is detected, the absorbable range of the time difference detection can be expanded. By describing the sequence number in the information area in the plurality of TS headers, the order of the plurality of TS headers in a period in which the description number is different can be determined. For example, even if the information is 1 bit of 0 and 1, it is possible to detect the arrival time difference of the 0th or 1st multiple TS headers, and it is about 2 times, which is half the appearance time interval of the double multiple TS headers. It is possible to detect an arrival time difference up to .73 ms. Furthermore, the information is 00,
Assuming that the two bits are 01, 10, and 11, twice as large as about 5.
The arrival time difference can be detected up to 46 ms.
As a result, transmission on the same cable television transmission path 3,
And separate band processing for transmission between band-division stations such that one of the MPEG-TS digital data of two or more TSs is transmitted in the VHF band and the other is transmitted in the UHF band; Not only in the case of the so-called cable television network distribution system that supplies digital video data, but also in the case of MPEG transmission of two or more TSs sharing a digital transmission device.
-Even in the case of performing a so-called digital network distribution method of distributing TS digital data by ATM, original data can be obtained.

A digital data processing process inside the transmitting device 1 according to the fifth embodiment will be described with reference to FIG. 15, and a digital data processing process inside the receiving device 2 will be described with reference to FIG.

FIG. 15 is a diagram showing an example of a data signal sequence in the course of digital data processing inside transmitting apparatus 1 according to the fifth embodiment of the present invention. In FIG. 15, 1511a, 151
1b, 1512a, 1512b are a plurality of TSs with sequence numbers
This is transmission data, and the same numbers as those in FIG. 2 indicate the same data. The transmission data 211a and the transmission data 211b have
By inserting and describing the sequence number of the digital data in the S header and its information descriptive area, a plurality of TS transmission data 1511a with a sequence number and a plurality of TS transmission data 1511b with a sequence number are obtained. 1
41a and 141b. Multiple TSs with sequence numbers
The transmission data 1512a and 1512b describe the long time of the multiple TS transmission data 1511a and 1511b with sequence numbers, and
a indicates a plurality of TS headers 0, data 1, data 3, data 5, data 7, data 7, and a plurality of TS headers 1 and 9; 6, data 8, a plurality of TS headers 1, and data 10.

FIG. 16 is a diagram showing an example of a data signal sequence in the course of digital data processing inside the receiving apparatus 2 according to the fifth embodiment of the present invention. In FIG. 16, 1601a, 1601
Reference numeral 1b denotes received MPEG-TS digital data of a plurality of TSs, 1602a, 1602b, 1603a, and 1603.
b is MPEG-TS digital data of a plurality of TSs with the arrival time difference absorbed, and the same numbers as those in FIG. 7 or FIG. 10 indicate the same data.

There is a time difference T3 (longer than T2 in FIG. 13) between the arrival times of the MPEG-TS digital data strings 1601a and 1601b of a plurality of TSs received from the 64QAM demodulation circuits 22a and 22b. The plural TS header sequence number analysis of the receiving apparatus 2 analyzes the plural TS headers and the sequence number described in the information area on the transmitting side by the time difference detection and absorption circuit 142, and the MPEG-TS of the plural TSs
The MPEG-TS digital data 1602a and 1602b of the plurality of TSs having the arrival time difference absorbed by detecting and absorbing the arrival time difference of the digital data are added to the plurality of TS separation circuits 52a and 52b and separated by the plurality of TSs. It becomes single absorbed MPEG-TS digital data 1003a, 1003b. MPEG-TS digital data 1603 of a plurality of TSs absorbed by the arrival time difference
“a” and “1603b” are MPs of a plurality of TSs absorbed by the arrival time difference.
The EG-TS digital data 1602a and 1602b are time-expanded data, and have the same time axis as the transmitting side.

On the transmitting side, a plurality of TS transmission data 1512a with a sequence number is composed of a plurality of TS headers 0, data 1, data 3,
The data 5, data 7, multiple TS headers 1, and data 9 are shown. The multiple TS transmission data 1512b with the sequence number is composed of multiple TS headers 0, data 2, data 4, data 6, data 8, multiple TS headers 1, and data 10. As shown, the received MPEG-TS digital data sequence 1 of a plurality of TSs
Even if there is a time difference of T3 between the arrival times of 601a and 1601b, the arrival time difference can be made uniform by aligning the positions of the plurality of TS headers 0. The longer the number of bits of the sequence number in the plurality of TS headers, the longer the time that can be absorbed.

According to the fifth embodiment, the 6 MHz band 6
Use two systems of 4QAM to increase the transmission speed,
The advantage that the information such as the start flag information for the emergency alert broadcast transmitted by the BS digital broadcast based on the header information can be transmitted by CATV is the same as that of the second to fourth embodiments, but a plurality of TS header sequence number analysis time difference detection In the absorption circuit 142, the MP of the plurality of TSs is determined by the sequence number in the plurality of TS headers.
Since the arrival time difference of the EG-TS digital data is detected, there is an advantage that the time difference detection absorbable range can be expanded compared to the fourth embodiment.

As described above, in the transmitting apparatus 1 according to the fifth embodiment, for example, the data division circuit 12 is high-speed MPEG-TS format digital data transmitted by satellite digital broadcasting from the satellite digital receiver 11. MPEG-
The multiplexing circuits 141a and 141b serving as sequence number-added multiple TS multiplexing means divide the TS signal sequence into two of odd-numbered packets and even-numbered packets, and
A plurality of T headers and a plurality of null digital data of a plurality of cable format TS digital data are multiplexed from the PEG-TS format digital data to form a plurality of T
A plurality of TS digital data having a prescribed rate matching the data rate of the S digital transmission system is generated, and the multiplexing circuits 141a and 141b describe the sequence numbers corresponding to the output order of the packets divided into the plurality of TS headers.
Each of the digital data is modulated by a different carrier and output to the transmission path 3. In the receiving apparatus 2, a plurality of frequency-multiplexed and transmitted frequency selecting circuits 21a and 21b and 64QAM demodulating circuits 22a and 22b serving as digital demodulating means are transmitted. A plurality of desired digital modulated waves are selected from the digital modulated waves, digital demodulation is performed in accordance with the digital modulator, and a plurality of TS header sequence number decoding time difference detection and absorption means is used as a plurality of TS header sequence number decoding time difference detection and absorption means. 1
42 decodes the sequence number of the digital data multiplexed in the plurality of TS headers on the transmitting apparatus 1 side from the plurality of TS digital data of the specified speed, detects the arrival time difference based on the sequence number, and inputs the information based on the information. The output timings of a plurality of TS digital data at a specified speed are aligned, and a plurality of separation circuits 52a and 52b serving as a plurality of TS separation means separate a single TS from the plurality of TS digital data at a specified speed to obtain M data.
PEG-TS format digital data is generated, the separated MPEG-TS format digital data is combined, and the original digital data, that is, the high-speed MPEG-TS transmitted by satellite digital broadcasting from the satellite digital receiver 11 is transmitted.
Since the formal digital data is synthesized, MPEG-TS digital data having a transmission speed higher than the transmission speed of the digital transmission system in CATV such as satellite digital broadcasting such as BS digital broadcasting can be transmitted by CATV.

In the cable television transmitting and receiving apparatuses according to the first to fifth embodiments, the high-speed MPEG-TS format digital data transmitted by the transmitting apparatus 1 in the satellite digital broadcasting from the satellite digital receiver 11 is used. Although the number of divisions is two, it is not limited to this, and it goes without saying that three or more divisions may be used.

As described above, the invention made by the present inventor is:
Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the embodiments of the present invention, and it is needless to say that various modifications can be made without departing from the scope of the invention. .

[0091]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

On a cable transmission line such as a cable television, digital data is separated, frequency-multiplexed by a plurality of digital modulation means and transmitted to the transmission line, and a plurality of digital signals obtained by a plurality of selective digital demodulation means are received on the receiving side. Since the original data can be obtained by synthesizing the data by the data synthesizing means, it is possible to effectively transmit a large amount of digital data. Since the time difference is detected and absorbed, the original data can be obtained even if a processing time difference occurs between a plurality of digital modulating means, a transmission line transmitted by frequency multiplexing, or a plurality of selected digital demodulating means.

When transmitting the satellite digital broadcast according to the present invention to a cable television, a plurality of 6 MHz bands 64QAM can be transmitted.
Even if a service is provided by a single MPEG-TS digital data of 9.162 Mbps or more, it can be transmitted to a cable television. 29.162 Mbp
Since more than s single MPEG-TS digital data can be transmitted, large-capacity digital data required for future digital broadcasting such as three-dimensional video can be effectively transmitted.

Furthermore, when transmitting to a cable television, since transmission is performed in a plurality of 6 MHz bands at 64 QAM, the leakage of the local oscillator of the television receiver during the current analog terrestrial television retransmission in the cable television is caused by the CATV transmission path. Even if it returns to, it is not affected and the bandwidth of the transmission path can be utilized to the maximum.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a transmission device and a reception device of a cable television according to an embodiment of the present invention, and is a diagram illustrating a configuration example in the case of transmitting a satellite digital broadcast by CATV.

FIG. 2 is a diagram showing an example of a data signal sequence in a digital data processing process inside the transmission device 1 according to FIG. 1 of the present invention.

FIG. 3 is a conceptual diagram of frequency multiplexing on a transmission line according to the present invention.

FIG. 4 is a diagram showing an example of a data signal sequence in a digital data processing process inside the receiving device 2 according to FIG. 1 of the present invention.

FIG. 5 is a configuration diagram illustrating a transmission device and a reception device of a cable television according to an embodiment of the present invention, and is a diagram illustrating a configuration example in the case of transmitting a satellite digital broadcast by CATV.

6 is a diagram showing an example of a data signal sequence in a digital data processing process inside the transmission device 1 according to FIG. 5 of the present invention.

7 is a diagram showing an example of a data signal sequence in a digital data processing process inside the receiving device 2 according to FIG. 5 of the present invention.

FIG. 8 is a configuration diagram illustrating a transmission device and a reception device of a cable television according to an embodiment of the present invention, and is a diagram illustrating a configuration example in a case where a satellite digital broadcast is transmitted by CATV.

9 is a diagram showing an example of a data signal sequence in a digital data processing process inside the transmitting apparatus 1 according to FIG. 8 of the present invention.

FIG. 10 is a diagram showing an example of a data signal sequence in a digital data processing process inside the receiving device 2 according to FIG. 8 of the present invention.

FIG. 11 is a configuration diagram illustrating a transmission device and a reception device of a cable television according to an embodiment of the present invention, and is a diagram illustrating a configuration example in the case of transmitting a satellite digital broadcast by CATV.

12 is a diagram showing an example of a data signal sequence in a digital data processing process inside the transmission device 1 according to FIG. 11 of the present invention.

13 is a diagram showing an example of a data signal sequence in a digital data processing process inside the receiving device 2 according to FIG. 11 of the present invention.

FIG. 14 is a configuration diagram illustrating a transmission device and a reception device of a cable television according to an embodiment of the present invention, and is a diagram illustrating a configuration example in the case of transmitting a satellite digital broadcast by CATV.

FIG. 15 is a diagram showing an example of a data signal sequence in a digital data processing process inside the transmitting apparatus 1 according to FIG. 14 of the present invention.

FIG. 16 is a diagram showing an example of a data signal sequence in a digital data processing process inside the receiving device 2 according to FIG. 14 of the present invention.

FIG. 17 is a diagram illustrating an example of a frame configuration based on a plurality of TS schemes for retransmitting a BS digital broadcast by cable television according to the related art.

FIG. 18 is a diagram illustrating an example of a frame configuration based on a plurality of TS systems for retransmitting a BS digital broadcast by cable television according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transmitting apparatus, 2 ... Receiving apparatus, 3 ... Transmission path, 10 ... Satellite broadcast receiving antenna, 11 ... Satellite digital receiver, 12 ...
Data division circuit, 13a, 13b ... multiplexing circuit, 14
a, 14b: 64QAM modulation circuit, 15: frequency multiplexing circuit, 21a, 21b: frequency selection circuit, 22a, 22b
... 64 QAM demodulation circuit, 23 ... MPEG-TS synchronous byte time difference detection and absorption circuit, 24 ... MPEG-TS data synthesis circuit, 25 ... MPEG-TS packet separation circuit, 26
... MPEG video decoder circuit, 27 ... Audio decoder circuit, 28 ... Display device on the receiving terminal side, 31 ... Whole band of frequency multiplex transmission line, 32 ... 64QAM modulation circuit 14
digital modulated wave output from a, 33... 64QAM
The digital modulated wave output from the modulation circuit 14b, 51
a, 51b: Multiple TS multiplexing circuit, 52a, 52b: Multiple TS separating circuit, 83: Multiple TS-MPEG-TS synchronous byte time difference detection and absorption circuit, 101: Digital demodulation / decoding circuit, 113: Multiple TS header time difference detection and absorption circuit,
131a, 131b: packet synthesis circuit, 132a: clock synchronization generation circuit, 132b: clock synchronization transfer circuit, 133a, 133b: speed comparison circuit, 134a, 1
34b Null packet generation circuit, 200 MPEG-T
S digital data sequence, 201 is a synchronization byte, 202: digital data, 203: error correction code, 210a, 21
0b ... divided data, 211a, 211b ... transmission data,
Reference numeral 401: synchronization byte, 402: digital data, 403
... Error correction codes, 411a, 411b ... MP received
EG-TS digital data, 412a, 412b... Data absorbed in arrival time difference, 413a, 413b... Time axis compressed data 414.
... Packet synthesizing circuit, 512a ... Clock synchronization generation circuit, 512b ... Clock synchronization transfer circuit, 513a, 51
3b: speed comparison circuit, 514a, 514b: null packet generation circuit, 515a, 515b: multiple TS header generation circuit, 611a, 611b: multiple TS transmission data, 70
1 ... synchronization byte, 702 ... digital data, 703 ... error correction code, 711a, 711b ... received plural TSs
MPEG-TS digital data, 712a, 712b
... Single MPEG-TS digital data after separation of a plurality of TSs, 713a, 713b ... Data with absorption of arrival time difference, 714a, 714b ... Time axis compressed data, 715 ...
Synthesized data, 1002a, 1002b... MPEG-TS digital data of a plurality of TSs absorbed by the arrival time difference, 10
03a, 1003b: Single MP absorbed by arrival time difference
EG-TS digital data, 1004a, 1004b ...
Time axis compressed data after arrival time difference absorption and separation of a plurality of TSs, 1005... Combined data, 1301a, 1301b.
MPEG-TS digital data of a plurality of received TSs,
1302a, 1302b... Multiple Ts absorbed by arrival time difference
MPEG-TS digital data of S, 141a, 141
b: sequence number added multiple TS multiplexing circuit, 142: multiple T
S header sequence number analysis time difference detection absorption circuit, 1411
a, 1411b: packet synthesis circuit, 1412a: clock synchronization generation circuit, 1412b: clock synchronization transfer circuit, 1413a, 1413b: speed comparison circuit, 1414
a, 1414b ... null packet generation circuit, 1415a,
1415b: Sequence number added multiple TS header generation circuit, 1
511a, 1511b, 1512a, 1512b ... multiple TS transmission data with sequence numbers, 1601a, 1601b
... Received MPEG-TS digital data of a plurality of TSs, 1602a, 1602b, 1603a, 1603b
... MPEG-TS digital data of a plurality of TSs absorbed by the arrival time difference.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tsutomu Noda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Naoyoshi Nakamura 2-31 Shiba, Minato-ku, Tokyo 19 Communication and Broadcasting Corporation F term (reference) 5C063 AA20 AB03 AB05 AC01 CA11 DA13 5C064 BA01 BB05 BC10 BC16 BC20 BD07 BD13 5K028 AA11 EE03 FF11 KK01 KK03

Claims (10)

[Claims] In a cable television transmission apparatus for transmitting digital data using a cable transmission line of a cable television, a transmission source of MPEG-TS format digital data is transmitted to a plurality of MPEG-TS-format digital data at a lower speed than the transmission source. Data dividing means for dividing the digital data into TS format digital data; and MPEG-TS format digital data having a speed matching the data transmission speed of the cable television by multiplexing null digital data with each of the divided MPEG-TS format digital data. , A digital modulator for digitally modulating a carrier with the generated MPEG-TS format digital data to generate a digital modulated wave, and a frequency multiplexing of the plurality of digital modulated waves. Signal synthesizing means for transmitting to the wired transmission path, wherein the multiplexing means A transmission apparatus for a cable television, comprising: synchronizing output timings of synchronization bytes of respective generated MPEG-TS format digital data to a digital modulation unit. 2. A cable television transmission apparatus for transmitting digital data using a cable transmission line of a cable television, comprising: a high-speed M that is higher than a data rate that can be transmitted by one carrier in the digital transmission system of the cable television.
A data dividing means for dividing the PEG-TS format digital data into a plurality of low-speed MPEG-TS format digital data having a data rate equal to or less than a data rate that can be transmitted by one carrier in the cable television digital transmission system, and an output from the data dividing means; A plurality of multiplexing means for multiplexing null digital data with a plurality of low-speed MPEG-TS format digital data and outputting MPEG-TS format digital data having a specified speed matching the data speed of the digital transmission system of cable television A plurality of digital modulating means for digitally modulating a carrier with MPEG-TS format digital data of a prescribed speed outputted from the plurality of multiplexing means to output a digital modulated wave; and an output of the plurality of digital modulating means. And a plurality of digital modulated waves including And a signal synthesizing means for, with synchronizing the operation clock of said plurality of multiplexing means,
MPEs output from the plurality of multiplexing means
A transmission apparatus for a cable television, wherein the transmission timing of synchronous bytes of G-TS format digital data is output. 3. A transmission apparatus for a cable television for transmitting digital data using a cable transmission line of a cable television, wherein a high-speed M which is higher than a data rate that can be transmitted by one carrier in the digital transmission system of the cable television.
A data dividing means for dividing the PEG-TS format digital data into a plurality of low-speed MPEG-TS format digital data having a data rate equal to or less than a data rate which can be transmitted by one carrier according to the cable television digital transmission system, and an output from the data dividing means; A plurality of low-speed MPEG-TS format digital data is multiplexed with a plurality of TS headers and null digital data of the plurality of TS format digital data of the cable TV to match the data speed of the plurality of TS digital transmission systems of the cable TV. Multiple TS at specified speed
A plurality of TS multiplexing means for outputting digital data; and a plurality of digital means for digitally modulating a carrier with a plurality of TS digital data of a prescribed speed outputted from the plurality of TS multiplexing means and outputting a digital modulated wave. Modulating means; and signal synthesizing means for frequency-multiplexing a plurality of digital modulated waves including outputs of the plurality of digital modulating means and transmitting the multiplexed waves to the transmission path, wherein an operation clock of the plurality of TS multiplexing means is provided. A transmission apparatus for a cable television, which synchronizes and outputs at least one of a synchronization byte and a plurality of TS headers of digital data output from the plurality of TS multiplexing means. 4. A transmission apparatus for a cable television for transmitting digital data using a cable transmission line of a cable television, wherein a high-speed M which is higher than a data rate that can be transmitted by one carrier in the digital transmission system of the cable television.
A data dividing unit for dividing the PEG-TS format digital data into a plurality of low-speed MPEG-TS format digital data having a data rate equal to or less than a data rate that can be transmitted by one carrier wave by the digital transmission device of the cable television; A plurality of low-speed MPEG-TS format digital data is multiplexed with a plurality of TS headers and null digital data of the plurality of TS format digital data of the cable TV to match the data speed of the plurality of TS digital transmission systems of the cable TV. Multiple TS at specified speed
A plurality of sequence number-added multi-TS multiplexing means for outputting digital data and describing and transmitting sequence numbers corresponding to the output order from the data division means in a plurality of TS headers; and the plurality of sequence number-added multi-TS multiplexing means A plurality of digital modulating means for digitally modulating a carrier wave with a plurality of TS digital data having a specified speed outputted from a plurality of digital modulated waves to output a digital modulated wave; and a plurality of digital modulated waves including outputs of the plurality of digital modulating means. Signal synthesizing means for multiplexing and transmitting the multiplexed signal to the transmission path, and synchronizing the operation clocks of the plurality of TS multiplexing means,
A transmission apparatus for a cable television, wherein digital data output from the plurality of sequence number-added plural TS multiplexing means is output with the output timings of plural TS headers aligned. 5. A cable television receiving apparatus for restoring original digital data from a signal transmitted using a cable transmission line of a cable television, wherein a plurality of frequency-multiplexed digital modulated waves are selected from the signal. Selected digital demodulation means for digitally demodulating MPEG-TS format digital data from the selected digital modulated wave;
Time difference detection and absorption means for detecting a synchronization byte of EG-TS format digital data and absorbing the arrival time difference of the plurality of digitally demodulated MPEG-TS format digital data from the arrival time difference of the synchronization byte, and absorbing the arrival time difference And a data synthesizing means for synthesizing the original digital data at a higher speed than the MPEG-TS format digital data from the plurality of MPEG-TS format digital data. 6. A cable television receiving apparatus for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television. MPE with specified speed that matches the digital modulation method by selecting the wave
A selection digital demodulation means for digitally demodulating the G-TS format digital data, and a synchronization byte from the digitally demodulated MPEG-TS format digital data having a specified speed inputted thereto and from the input specified speed MPEG-TS format digital data. Detecting the arrival time difference between the plurality of specified speed MPEG-TS format digital data from the arrival time difference of the synchronization byte, and outputting the synchronization byte of the specified speed MPEG-TS format digital data input based on the information; And a plurality of MPEs output from the time difference detecting and absorbing means.
A cable television receiving apparatus comprising: data combining means for combining G-TS format digital data and returning to high-speed MPEG-TS format digital data before transmission. 7. A cable television receiving apparatus for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television, wherein a desired plurality of TS digital signals is obtained from a plurality of frequency-multiplexed and transmitted digital modulated waves. A plurality of selected TS separation digital demodulating means for separating a single TS from a plurality of TS digital data of a specified speed by a digital demodulation matching a digital modulation method by selecting a modulated wave and demodulating MPEG-TS format digital data; The demodulated MPEG-TS format digital data is input, a synchronization byte is detected from the input MPEG-TS format digital data, and the M byte is detected from the arrival time difference of the synchronization byte.
TS time difference detection and absorption means for detecting the arrival time difference of the PEG-TS format digital data and outputting the synchronization byte of the MPEG-TS format digital data input in accordance with the information and outputting the same, and the TS time difference detection and absorption means And a TS data synthesizing means for synthesizing a plurality of MPEG-TS format digital data output from the digital camera and returning the data to high-speed MPEG-TS format digital data before transmission. 8. A cable television receiving apparatus for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television, wherein a desired plurality of digital modulated waves are obtained from a plurality of frequency-multiplexed and transmitted digital modulated waves. A plurality of digital demodulating means for selecting a wave and performing digital demodulation in accordance with a digital modulation method; and a plurality of TS digital data having a specified speed which is an output of the plurality of digital demodulating means, and a plurality of TS digital data having a specified speed inputted thereto. Detecting the synchronization byte of the data to detect the arrival time difference between the plurality of input digital data, and outputting the synchronized TS output of the synchronization byte of the plurality of digital data of the specified speed inputted at the specified speed based on the information. A time difference detection / absorption unit, and a plurality of specified speeds output from the plurality of TS synchronization time difference detection / absorption units. Single TS from TS digital data
A plurality of TS separating means for outputting MPEG-TS format digital data by separating the plurality of MPEG-TS format digital data, and a plurality of MPEG-TS format digital data which are the plurality of TS separating means to produce a high-speed MPEG-TS before transmission. A cable television receiving apparatus, comprising: a TS data synthesizing means for returning to format digital data. 9. A cable television receiving apparatus for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television, wherein a desired plurality of digital modulated waves are obtained from a plurality of frequency-multiplexed and transmitted digital modulated waves. A plurality of digital demodulation means for selecting a wave and performing digital demodulation in accordance with the digital modulation device; and a plurality of TS digital data having a specified speed which is an output of the plurality of digital demodulation means, and the inputted plurality of TS digital data having a specified speed. Detecting a plurality of TS headers of data to detect a difference in arrival time of a plurality of inputted digital data, and outputting the plurality of TS headers of a plurality of TS digital data of a specified speed inputted at the same timing according to the information and outputting the plurality of TS headers. TS header time difference detection and absorption means, and a standard which is an output of the plurality of TS header time difference detection and absorption means. A plurality of TS separating means for outputting MPEG-TS format digital data by separating a single TS from a plurality of TS digital data at a constant speed, and a plurality of MPEG-TS format digital data as the plurality of TS separating means. A cable television receiving device comprising: TS data combining means for combining and returning to high-speed MPEG-TS format digital data before transmission. 10. A cable television receiving apparatus for frequency-multiplexing and transmitting digital data to a cable transmission line of a cable television, wherein a desired plurality of digital modulated waves are obtained from a plurality of frequency-multiplexed and transmitted digital modulated waves. A plurality of digital demodulating means for selecting a wave to perform digital demodulation conforming to the digital modulation device; and a plurality of the plurality of digitally demodulated TS digital data having a specified speed inputted thereto and receiving the inputted plurality of TS digital data having a specified speed. The transmitting side decodes the sequence number of the digital data multiplexed in the plurality of TS headers on the transmitting side, detects the arrival time difference based on the sequence number, and aligns the output timing of the plurality of TS digital data of the specified speed inputted with the information. A plurality of TS header sequence number decoding time difference detection / absorption means for outputting;
A single TS is separated from a plurality of TS digital data of a specified speed from the header sequence number decoding
A plurality of TS separating means for outputting EG-TS format digital data; and a plurality of MPEs as the plurality of TS separating means.
A cable television receiving apparatus comprising: TS data combining means for combining G-TS format digital data and returning to high-speed MPEG-TS format digital data before transmission.