JP2002300123A - Digital broadcast re-transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast re-transmission system, which re- transmits a satellite digital broadcast program and a ground digital broadcast program, the facility of which can be updated in an update time as less as possible. SOLUTION: The digital broadcast re-transmission system is provided with N sets of operation digital re-transmission means that revise and add received data information for N digital broadcast programs digitally modulated and re-transmitted and output the signal digitally modulated again, M sets of standby digital re-transmission means that revise and add digital broadcasting received data information and output the digitally modulated signal again, a system control means that controls the operation of the M sets of standby digital re- transmission means and the N sets of operating digital re-transmission means, and a synthesis means that synthesizes outputs of the M sets of standby digital re-transmission means and the N sets of operating digital re-transmission means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast retransmitting apparatus for retransmitting digital satellite broadcasting and digital terrestrial broadcasting.

[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" 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 62 megabits (29.162 Mbps) digital data,
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 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
In digital broadcasting, it has a transmission speed of about 60 Mbps,
Multiple transponders (one transponder) can use a plurality of modulation schemes, and a TS for video, audio, data, etc. has a frame configuration to allow a plurality of TSs (hereinafter, a plurality of T
S) is sent 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. The TMCC signal is defined by the Ministry of Posts and Telecommunications Ordinance No. 57 of June 11, 1998, and uses a synchronous signal portion of the TS every frame (= 48 slots, 1 slot = 204 slots) before the main signal.
), And transmitted with one superframe (= 8 frames) as a cycle. The configuration is shown in the Ministry of Posts and Telecommunications Notice No. 260 of June 11, 1998. The transmission mode / slot information is used for selecting a digital demodulation means, and relative TS / slot information and relative TS / TSID correspondence are desired. It is used for selecting and outputting a 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 the 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 Multiplexing System for Cable TV" on pages 7 to 12 is proposed. This report proposes a TSMF header that collects N 188-byte TS packets to form a multiplexed frame, and describes, in the first packet, TS arrangement information in a frame and the like. According to this proposal, a plurality of TS signals can be efficiently transmitted to a cable television through BS digital broadcasting. In this proposal, the transmission speed is 52.17 Mbps.
Transmission speed of 29.162 Mb
Digital CAT using 64 QAM with 6 ps 6 MHz bandwidth
Proposal of transmission using two V signals and transmission speed of 57.607
There is a proposal to transmit one digital CATV signal using 64 Mbps in a 12 Mbps 12 MHz band.
By inserting a null TS for synchronization to match the difference in transmission speed between digital broadcasting and digital CATV, and rewriting program clock information (hereinafter referred to as PCR information) for reproducing a system clock on the receiving side. Has been realized.

[0006] The structure of the multiplex frame for the transmission of a plurality of TSs in this digital CATV is determined by Ordinance No. 51 of the Ministry of Posts and Telecommunications on August 14, 2000, and the structure of the multiplex frame header is described in the postal service of August 14, 2000. As shown in Ministry Notification No. 522, transmission / reception control information such as emergency information transmitted by a TMCC signal of BS digital broadcasting and an extended information area are secured.

[0007]

As described above, satellite digital broadcasts and terrestrial digital broadcasts are retransmitted even in digital CATV because areas for retransmitting information and the like transmitted by BS digital broadcasts are secured. Digital broadcast retransmission devices have become possible. However, due to the continuity of a broadcast program without a pause, a time for maintenance and equipment update due to the stoppage of the digital broadcast retransmission device cannot be taken, and the service has to be stopped during the equipment update period.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital retransmitting apparatus capable of renewing a digital broadcasting retransmitting apparatus for retransmitting a digital satellite broadcasting or a terrestrial digital broadcasting by minimizing the time required for updating the equipment. To provide.

[0009]

SUMMARY OF THE INVENTION In order to achieve the object of the present invention, a digital retransmitting apparatus according to the present invention is a digital retransmitting apparatus for a digital cable television that receives a digital broadcast, modulates the digital broadcast again, and retransmits it. An operation digital retransmitting means for outputting the digitally modulated signal again after changing the reception data information of N digital broadcasts corresponding to the digitally modulated and retransmitted, and changing the reception data information of the digital broadcast M spare digital retransmitting means for outputting a digitally modulated signal again after the addition, system controlling means for controlling operations of the M spare digital retransmitting means and the N operating digital retransmitting means, , And combining means for combining the outputs of the N operational digital retransmitting means and the M standby digital retransmitting means.

[0010] According to the above-mentioned means, the system control means operates the M spare digital retransmission means to update a part of the N operational digital retransmission means, thereby sequentially updating all the equipment. Since the equipment of the N operation digital retransmission units can be updated, the time during which the output of each operation digital retransmission device is cut off as much as possible with the equipment update can be shortened as much as possible, and the service must be stopped due to the equipment update. No equipment can be updated.

A digital retransmitting apparatus according to the present invention is a digital cable television retransmitting apparatus for receiving a digital broadcast, performing digital modulation again, and retransmitting the digital broadcast.
Digital broadcast receiving means for receiving digital broadcast and outputting received signal data; information change adding means for converting and adding internal information of output data of the digital broadcast receive means; Digital modulation means for outputting a modulated and retransmitted signal,
N operation of digital broadcast reception control means for controlling the digital broadcast reception means, information change addition control means for controlling the information change addition means, and digital modulation control means for controlling the digital modulation means Digital broadcast receiving means for receiving digital broadcasts and outputting received signal data; information change adding means for converting and adding internal information of output data of the digital broadcast receiving means; Digital modulation means for outputting a signal which is digitally modulated by the output data of the addition means and retransmitted, digital broadcast reception control means for controlling the digital broadcast reception means, and information change addition control for controlling the information change addition means Means and digital modulation control means for controlling the digital modulation means, the M number of spare digital retransmissions Means for controlling at least one of the M standby digital retransmission means, the N operation digital retransmission means, the digital broadcast reception control means, the information change addition means, and the digital modulation means. Means for synthesizing the outputs of the M digital retransmitting means and the N digital retransmitting means.

According to the above-mentioned means, by operating the M spare digital retransmitting means by the system control means, a part of the N operating digital retransmitting means is updated, so that all the equipments are sequentially updated. Since the equipment of the N operation digital retransmission units can be updated, the time during which the output of each operation digital retransmission device is cut off as much as possible with the equipment update can be shortened as much as possible, and the service must be stopped due to the equipment update. No equipment can be updated.

Still further, a digital retransmitting apparatus according to the present invention is a digital cable television retransmitting apparatus for receiving a digital broadcast, digitally modulating the digital broadcast again, and retransmitting the digital broadcast. Digital broadcast receiving means, an information change adding means for converting and adding internal information of output data of the digital broadcast receiving means, and a digital signal for outputting a signal which is digitally modulated by the output data of the information change adding means and retransmitted. Modulation means; digital broadcast reception control means for controlling the digital broadcast reception means; information change addition control means for controlling the information change addition means; digital modulation control means for controlling the digital modulation means; Information detecting means for detecting change start information from output data of the receiving means; Digital broadcasting receiving means for receiving N digital broadcasting and outputting received signal data by providing N operating digital retransmitting means comprising information separating means for separating change information from output data of the receiving means; Information change adding means for converting and adding the internal information of the output data of the digital broadcast receiving means, digital modulation means for outputting a signal which is digitally modulated by the output data of the information change adding means and retransmitted; Digital broadcast reception control means for controlling broadcast reception means, information change addition control means for controlling the information change addition means, digital modulation control means for controlling the digital modulation means, and output data of the digital broadcast reception means. Information detection means for detecting change start information from the inside; and change information from output data of the digital broadcast receiving means. The M stage of the pre-digital retransmission means constituted by the information separating means for providing, in response to the fact that any of the information separating means of said N number of operational digital retransmission means detects change start information,
The change information separated by the information separating means of the M spare digital retransmitting means and the N operating digital retransmitting means at least of the digital broadcast reception control means, the information change adding means, and the digital modulating means. Retransmission system control means for controlling transfer to one means, and synthesizing means for synthesizing outputs of the M digital retransmitting means and the N digital retransmitting means.

According to the above-mentioned means, the retransmission system control means operates the M standby digital retransmission means to update a part of the N operation digital retransmission means, thereby sequentially updating the equipment. Since the equipment can be updated for all the N operation digital retransmission units, the time during which the output of each operation digital retransmission device is cut off as the equipment is updated can be shortened as much as possible, and the service stop due to the equipment update can be stopped. Equipment can be renewed without having to do it.

Still further, a digital retransmission apparatus according to the present invention is a digital cable television retransmission apparatus for receiving a digital broadcast, digitally modulating the digital broadcast again, and retransmitting the digital broadcast. Digital broadcast reception separation means for separating the data output into
A plurality of information change addition means for converting and adding internal information of output data of the digital broadcast reception separation means; and a plurality of digital output means for outputting a signal which is digitally modulated by the output data of the plurality of information change addition means and retransmitted. Modulation means, digital broadcast reception control means for controlling the digital broadcast reception separation means, multiple information change addition control means for controlling the plurality of information change addition means, and multiple digital modulation for controlling the plurality of digital modulation means Control means; information detecting means for detecting change start information from the output data of the digital broadcast reception separating means; and information separating means for separating change information from the output data of the digital broadcast reception separating means. N digital operation retransmission means are provided to receive digital broadcasts and divide received signal data into a plurality of data outputs. A digital broadcast receiving separation means for,
A plurality of information change addition means for converting and adding internal information of output data of the digital broadcast reception separation means; and a plurality of digital output means for outputting a signal which is digitally modulated by the output data of the plurality of information change addition means and retransmitted. Modulation means, digital broadcast reception control means for controlling the digital broadcast reception separation means, multiple information change addition control means for controlling the plurality of information change addition means, and multiple digital modulation for controlling the plurality of digital modulation means Control means; information detecting means for detecting change start information from the output data of the digital broadcast reception separating means; and information separating means for separating change information from the output data of the digital broadcast reception separating means. And M of the standby digital retransmitting means are provided, and one of the information separating means of the N operational digital retransmitting means is changed. In response to the detection of the start information,
The change information separated by the information separating means of the M spare digital retransmitting means and the N operating digital retransmitting means at least of the digital broadcast reception control means, the information change adding means, and the digital modulating means. Retransmission system control means for controlling transfer to one means, and synthesizing means for synthesizing outputs of the M digital retransmitting means and the N digital retransmitting means.

According to the above-described means, the re-transmission system control means operates the M standby digital re-transmission means to update a part of the N operational digital re-transmission means, thereby sequentially updating the equipment. Since the equipment can be updated for all the N operation digital retransmission units, the time during which the output of each operation digital retransmission device is cut off as the equipment is updated can be shortened as much as possible, and the service stop due to the equipment update can be stopped. Equipment can be renewed without having to do it.

[0017]

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

FIG. 1 is a configuration diagram showing a retransmitting device and a receiving device in a cable television according to Embodiment 1 of the present invention, and shows a configuration example in the case of transmitting CATV digital satellite broadcasting. In FIG. 1, 1 is a retransmitting device, 2 is a receiving device, 3 is a transmission path, 10 is a satellite broadcast receiving antenna, 11
Reference numerals a, 11b, and 11n denote satellite digital retransmission devices, 12 denotes a synthesis circuit, 13 denotes a retransmission system control device, 21 denotes a frequency selection circuit, 22 denotes a 64QAM demodulation circuit, and 23 denotes an MPE.
G-TS packet separation circuit, 24 is an MPEG video decoder circuit, 25 is an audio decoder circuit, 26 is a display device on the receiving terminal side, 111a, 111b, 111n are satellite digital reception and demodulation circuits, 112a, 112b, 112
n is a satellite digital reception control circuit, 113a, 113b,
113n is a digital data information change / addition circuit, 114
a, 114b and 114n are digital data information description control circuits, 115a, 115b and 115n are 64QAM modulation circuits, and 116a, 116b and 116n are 64QAM modulation control circuits.

In the retransmitting device 1, the modulated signal of the satellite digital broadcast received by the satellite broadcasting receiving antenna 10 is transmitted to the satellite digital retransmitting devices 11a, 11b, 11n of the retransmitting device 1 via a cable by 64QAM suitable for CATV transmission. The signal is converted into a signal, frequency-multiplexed with another modulated wave by the combining circuit 12, and transmitted to the transmission line 3. The satellite digital retransmitting devices 11a, 11b, and 11n have the same function, and in the present embodiment, the satellite digital retransmitting devices 11a and 11b operate as services and use the satellite digital retransmitting devices. Numeral 11n is a retransmission device that is not in service and is reserved. The data is transmitted by digital demodulation of the channel selected by the satellite digital reception / demodulation circuit 111a, 111b or 111n in the satellite digital retransmitting device 11a, 11b or 11n, and by satellite digital broadcasting which has been subjected to transmission path decoding processing such as error correction and energy spreading. MPEG-TS digital data is obtained. Satellite digital reception control circuit 112a, 112b or 112n
Is a control circuit for the satellite digital reception / demodulation circuit 111a, 111b or 111n.

Satellite digital reception / demodulation circuits 111a, 11
The MPEG-TS digital data obtained by 1b or 111n is converted into a digital data information change / addition circuit 113.
a, 113b or 113n. In the digital data information change / addition circuit 113a, 113b or 113n, digital data obtained by converting satellite digital broadcast information to CATV information or adding CATV transmission frequency information by 64QAM modulation is added to 64QAM.
The signal is sent to the modulation circuit 115a, 115b or 115n, and the 64QAM modulation circuit 115a, 115b or 1
The 64QAM signal, which is the output of 15n, is frequency-multiplexed by the combining circuit 12 and transmitted to the transmission path 3. Digital data information description control circuit 114a, 114b or 1
14n is a digital data information change / addition circuit 113a,
In the control circuit of 113b or 113n, 64QAM modulation control circuit 116a, 116b or 116n
It is a control circuit of the QAM modulation circuit 115a, 115b or 115n.

The receiving device 2 receives a plurality of digitally modulated waves transmitted to the transmission path 3 as input and outputs a plurality of frequency selecting circuits 2 from the plurality of digitally modulated waves.
The required modulated wave is selected by 1 and the selected 6
The 4QAM modulated wave can be demodulated by the 64QAM demodulation circuit 22 and returned to MPEG-TS format digital data. MPEG-TS format digital data is MPEG-
The input to the TS packet separating circuit 23 is
The S packet separating circuit 23 separates each packet of video and audio, the video packet data is decoded by the MPEG video decoder 24, and the audio packet is
The video signal and the audio signal are obtained by being decoded by the audio decoder 25 and input to the display device 26.

Next, a process of updating equipment for upgrading the control software of the retransmission device in the cable television according to the first embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a flowchart for explaining a process of updating equipment for upgrading the control software of the retransmitting device in the cable television according to the first embodiment of the present invention.

In step 201, a system change request is issued for the purpose of updating equipment.

In step 202, the retransmission system controller 13 changes the control software so that the spare satellite digital retransmission device 11n can be changed by the retransmission device that is not currently serving before step 202. State, but 64QAM modulation control circuit 116n
In this state, no 64QAM signal is output, and at least one control circuit of the satellite digital reception control circuit 112n, the digital data information description control circuit 114n, and the 64QAM modulation control circuit 116n receives control software from the information from the retransmission system control device 13. Make changes.

In step 203, the satellite digital retransmitting device 11n, which is a spare whose control software has been changed, is
To the satellite digital retransmission device 11a, which is in operation, to change the satellite digital broadcast reception channel of the satellite digital reception demodulation circuit 111n via the satellite digital reception control circuit 112n with information from the retransmission system control device 13 Except for the part changed for updating the equipment by changing the modulation frequency setting of the 64QAM modulation circuit 115n via the 64QAM modulation control circuit 116n, the state is the same as that of the satellite digital retransmission equipment 11a.

In step 204, the 64QAM modulation control circuit 11 receives the information from the retransmission system
Satellite digital retransmission equipment 11a in operation via 6a
64 which is the output of the 64QAM modulation circuit 115a
Turn off the QAM modulated signal.

In step 205, the 64QAM modulation control circuit 11 uses the information from the retransmission system controller 13.
6n, which is a spare satellite digital retransmitting device 11
The 64QAM modulation circuit 115n in n outputs a 64QAM modulation signal. This step 204 and step 20
5, the digital satellite retransmission equipment 1 in operation
1a becomes the spare, and the satellite digital retransmitting device 11n, which was the spare, becomes operational.

In step 206, the retransmission system controller 13 sets the satellite digital retransmitting device 11a, which was in service at the time prior to step 203 but was spared in step 204, in a control software changeable state, but at 64QAM. 64Q by the modulation control circuit 116a
The AM signal is not output, and the satellite digital reception control circuit 11 receives information from the retransmission system controller 13.
2a, digital data information description control circuit 114a, 64
The control software is changed in at least one control circuit of the QAM modulation control circuit 116a.

In step 207, the satellite digital retransmitting device 11a, which is a spare whose control software has been changed, is
To the satellite digital retransmission device 11b, which is in operation, to change the satellite digital broadcast reception channel of the satellite digital reception demodulation circuit 111a via the satellite digital reception control circuit 112a with information from the retransmission system control device 13 Except for the part changed for updating the equipment by changing the modulation frequency setting of the 64QAM modulation circuit 115a via the 64QAM modulation control circuit 116a, the state is the same as that of the satellite digital retransmission equipment 11b.

In step 208, the 64QAM modulation control circuit 11
Satellite digital retransmission equipment 11b in operation via 6b
64, which is the output of the 64QAM modulation circuit 115b
Turn off the QAM modulated signal.

In step 209, the 64QAM modulation control circuit 116a uses the information from the retransmission system controller 13
And outputs a 64QAM modulated signal of the 64QAM modulation circuit 115a in the spare satellite digital retransmitting device 11a. By the steps 208 and 209, the satellite digital retransmitting equipment 11b
Is a spare, and the satellite digital retransmitting device 1 that was the spare
1a becomes the operation.

In step 210, step 202
In the previous state, the operation was the satellite digital retransmitting device 11a and the satellite digital retransmitting device 11b, and the spare was the satellite digital retransmitting device 11n. In the state after step 209, the satellite digital retransmitting device 11n Since the state of the satellite digital retransmitting device 11a has been changed to the state of the satellite digital retransmitting device 11b, the operation is the satellite digital retransmitting device 11n and the satellite digital retransmitting device 11a, and the spare is the satellite digital retransmitting device 11a. The retransmission system control device 13 recognizes that the device is the retransmission device 11b.

In step 211, since the system change request has been completed for the purpose of updating the equipment, the process ends.

As described above, in the retransmitting device 1 in the cable television according to the first embodiment, the retransmitting device not in service from the retransmitting system control device 13 controls the spare satellite digital retransmitting device 11n. After the software is changed and the state is the same as that of the satellite digital retransmitting device 11a which is the operation to be replaced, the satellite digital retransmitting device 11a is turned off and the satellite digital retransmitting device 11a is turned off.
By outputting n, the satellite digital retransmitting device 11a that has been in operation becomes a standby device, and the satellite digital retransmitting device 11n that has been in operation becomes active. Similarly, since the satellite digital retransmission device 11a can sequentially replace the spare with the satellite digital retransmission device 11b by the operation device,
The time during which the output of each satellite digital retransmitting device operated in connection with the equipment update can be cut off as short as possible, and the equipment can be updated without stopping the service accompanying the equipment update.

Next, 6 used in the service of the retransmitting device in the cable television according to the first embodiment of the present invention.
A version of the control circuit control software in the case where the 4QAM modulation circuits 115a and 115b are modulation circuits fixed to a certain frequency and the spare 64QAM modulation circuit 115n is a modulation circuit whose frequency is variable corresponding to all channels. The process of updating equipment to be upgraded will be described with reference to FIG. In this case, the 64QA used for the service
Since the M modulation circuits 115a and 115b are fixed at a certain frequency, a fixed band limiting filter can be provided at the output of the modulation circuit, and noise outside the band can be suppressed. This has the advantage that the noise of the signal can be reduced.

FIG. 3 is a flowchart for explaining a process of updating equipment for upgrading the control software of the retransmitting device in the cable television according to the first embodiment of the present invention.

In step 301, a system change request is issued for the purpose of updating equipment.

In step 302, the control software change state is set so that the spare satellite digital retransmitting device 11n can be changed in control software by the retransmitting device that is not serviced by the retransmission system control device 13.
In a state where the 64QAM signal is not output by the M modulation control circuit 116n, at least one of the satellite digital reception control circuit 112n, the digital data information description control circuit 114n, and the 64QAM modulation control circuit 116n is controlled by information from the retransmission system control device 13. Change the control software to the control circuit.

At step 303, the satellite digital retransmitting device 11n, which is the spare whose control software has been changed, is
To the satellite digital retransmission device 11a, which is in operation, to change the satellite digital broadcast reception channel of the satellite digital reception demodulation circuit 111n via the satellite digital reception control circuit 112n with information from the retransmission system control device 13 Except for the part changed for updating the equipment by changing the modulation frequency setting of the 64QAM modulation circuit 115n via the 64QAM modulation control circuit 116n, the state is the same as that of the satellite digital retransmission equipment 11a.

In step 304, the 64QAM modulation control circuit 11 uses the information from the retransmission system controller 13
Satellite digital retransmission equipment 11a in operation via 6a
64 which is the output of the 64QAM modulation circuit 115a
After the QAM modulation signal is cut off, the 64QAM modulation signal is output from the 64QAM modulation circuit 115n in the spare satellite digital retransmission equipment 11n via the 64QAM modulation control circuit 116n with the information from the retransmission system control device 13. . As a result, the spare satellite digital retransmitting device 11n becomes operational instead of the operating satellite digital retransmitting device 11a, and the control software of the operating satellite digital retransmitting device 11a is upgraded. Ready.

In step 305, the retransmission system controller 13 sets the satellite digital retransmission device 11a to a state in which the control software can be changed, but the 64QAM modulation control circuit 1
In the state where the 64QAM signal is not output by 16a, the information from the retransmission system controller 13 is used to control at least one of the satellite digital reception control circuit 112a, the digital data information description control circuit 114a, and the 64QAM modulation control circuit 116a. Make software changes.

In step 306, the 64QAM modulation control circuit 11 receives the information from the retransmission system controller 13
Satellite digital retransmission equipment 11n in operation via 6n
64 which is the output of the 64QAM modulation circuit 115n
After the QAM modulation signal is cut off, the 64QA in the satellite digital retransmission equipment 11a is transmitted via the 64QAM modulation control circuit 116a by the information from the retransmission system control device 13.
The M modulation circuit 115a outputs a 64QAM modulation signal.
The upgrade of the control software of the originally operated satellite digital retransmitting device 11a is completed in place of the satellite digital retransmitting device 11n operated in place of the alternative.

Steps 307 to 310 show a process of upgrading the control software of the satellite digital retransmitting device 11b in operation in the same manner.

In step 307, the satellite digital retransmitting device 11n, which is a spare whose control software has been changed, is
To the satellite digital retransmitting device 11b, which is in operation, using the information from the retransmission system control device 13 via the satellite digital reception control circuit 112n to change the satellite digital broadcast reception channel of the satellite digital reception demodulation circuit 111n, Except for the part changed for updating the equipment by changing the modulation frequency setting of the 64QAM modulation circuit 115n via the 64QAM modulation control circuit 116n, the state is the same as that of the satellite digital retransmission equipment 11b.

In step 308, the 64QAM modulation control circuit 11
Satellite digital retransmission equipment 11b in operation via 6b
64, which is the output of the 64QAM modulation circuit 115b
After the QAM modulation signal is cut off, the 64QAM modulation signal is output from the 64QAM modulation circuit 115n in the spare satellite digital retransmission equipment 11n via the 64QAM modulation control circuit 116n with the information from the retransmission system control device 13. . As a result, the spare satellite digital retransmitting device 11n is replaced by the operating satellite digital retransmitting device 11b, and the control software of the operating satellite digital retransmitting device 11b is upgraded. Ready to be.

In step 309, the retransmission system controller 13 sets the satellite digital retransmitting device 11b in a control software changeable state.
In the state where the 64QAM signal is not output by 16b, at least one control circuit of the satellite digital reception control circuit 112b, the digital data information description control circuit 114b, and the 64QAM modulation control circuit 116b is controlled by the information from the retransmission system control device 13. Make software changes.

At step 310, the 64QAM modulation control circuit 11 receives the information from the retransmission system controller 13
Satellite digital retransmission equipment 11n in operation via 6n
64 which is the output of the 64QAM modulation circuit 115n
After the QAM modulation signal is cut off, the 64QA in the satellite digital retransmission equipment 11b is transmitted via the 64QAM modulation control circuit 116b by the information from the retransmission system control device 13.
The M modulation circuit 115b outputs a 64QAM modulation signal.
This is the satellite digital retransmitting equipment 11n that was operated as an alternative
Then, the version upgrade of the control software for the originally operated satellite digital retransmission device 11b is completed.

In step 311, the system change request has been completed for the purpose of updating the equipment, and the processing is terminated.

FIG. 4 is a configuration diagram showing a retransmission device in a cable television according to a second embodiment of the present invention, and shows a configuration example in the case of transmitting a satellite digital broadcast by CATV. FIG.
, 14 is a retransmission system controller, 117a,
117b and 117n are information separation circuits, 118a and 118
b and 118n are information detection circuits.

The second embodiment corresponds to a system in which equipment update information is transmitted via digital satellite broadcasting, and is for updating control software by so-called download.

In FIG. 4, in addition to the circuit shown in FIG. 1, information separation circuits 117a and 117a correspond to a system in which equipment update information is transmitted via satellite digital broadcasting.
7b, 117n and information detection circuits 118a, 118b, 1
18n, and the information detection circuits 118a, 118b, 1
18n has been changed to the retransmission system control device 14 capable of inputting. Also, the receiving device 2 is not described because it is the same as FIG. Also in FIG. 4, as in FIG. 1, the satellite digital retransmitting devices 11a and 11b are service-operating retransmitting devices, and the satellite digital retransmitting device 11n is a non-service retransmitting device and is reserved.

Satellite digital reception / demodulation circuits 111a, 11
1b or the output of 111n, the information detection circuit 118a,
118b or 118n is provided, corresponding to a method in which information is transmitted via satellite digital broadcasting.
To grasp the update schedule of the control software by so-called download. If there is an update schedule, a spare satellite digital retransmission device 11n is prepared via the retransmission system control device 14 for updating the control software by downloading. When the download is started, the control software separated from the output of the satellite digital reception demodulation circuit 111a, 111b or 111n by the information separation circuit 117a, 117b or 117n is transmitted to the satellite digital reception control circuit 112.
a, 112b or 112n or a digital data information description control circuit.

A process of updating equipment for upgrading the control software of the retransmission device in the cable television according to the second embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a flow chart for explaining a process of updating equipment for upgrading the control software of the retransmitting device in the cable television according to the second embodiment of the present invention.

In step 501, the information detection circuit 118a or 118b detects an update of control software from the output of the satellite digital reception / demodulation circuit 111a or 111b, and transmits the information to the retransmission system controller 14.

In step 502, the retransmission system controller 14 issues a system change request.

In step 503, the satellite digital retransmitting device 11n, which operates the spare satellite digital retransmitting device 11n, is operated according to an instruction from the retransmission system control device 14.
In order to replace it with a, the satellite digital broadcast reception channel change of the satellite digital reception demodulation circuit 111n via the satellite digital reception control circuit 112n with the information from the retransmission system control device 14 and the 64QAM modulation control circuit 116
n, except that the modulation frequency setting of the 64QAM modulation circuit 115n is changed for updating the equipment by changing the modulation frequency setting of the 64QAM modulation circuit 115n. 6
In this state, the 4QAM signal is not output.

In step 504, the control software separated by the information separating circuit 117n from the output of the satellite digital receiving and demodulating circuit 111n is used to transmit the control software to the satellite digital receiving control circuit 11n.
2n or digital data information description control circuit 114n
Change the control software.

In step 505, the satellite digital retransmitting device 11n, which is a spare whose control software has been changed, is
Is replaced with the satellite digital retransmitting device 11a, which is in operation, by using information from the retransmission system controller 14 as 6
After cutting off the 64QAM modulation signal which is the output of the 64QAM modulation circuit 115a in the operating satellite digital retransmission equipment 11a via the 4QAM modulation control circuit 116a, the 64QA signal is transmitted by the information from the retransmission system control device 14.
The 64QAM modulation circuit 11 in the spare satellite digital retransmission device 11n via the M modulation control circuit 116n
It outputs 5n 64QAM modulated signals. This step 5
05, the spare satellite digital retransmitting device 11n becomes operational instead of the operating satellite digital retransmitting device 11a, and the control software of the operating satellite digital retransmitting device 11a is upgraded. Ready to be.

In step 506, the 64QAM signal is not output by the 64QAM modulation control circuit 116a in the satellite digital retransmission equipment 11a, and the control software separated by the information separation circuit 117a from the output of the satellite digital reception / demodulation circuit 111a. The control software of the satellite digital reception control circuit 112a or the digital data information description control circuit 114a is changed.

In step 507, the information from the retransmission system controller 14 is used to replace the satellite digital retransmission device 11a, which has completed the change of the control software, with the satellite digital retransmission device 11n that is operating as an alternative.
After cutting off the 64QAM modulation signal which is the output of the 64QAM modulation circuit 115n in the satellite digital retransmission equipment 11n via the QAM modulation control circuit 116n, the 64QAM modulation control circuit 116a is controlled by the information from the retransmission system controller 14. A 64QAM modulation signal of the 64QAM modulation circuit 115a in the satellite digital retransmitting device 11a which has completed the change of the control software is output. By this step 507, the satellite digital retransmitting device 11a, which was originally operated, is changed to the satellite digital retransmitting device 11n which is operated instead, and the control software of the operating satellite digital retransmitting device 11a is operated. The upgrade can be completed and the original operation status can be restored.

In step 508, the processes of steps 503 to 507 are performed by the satellite digital retransmitting device 11b and the satellite digital retransmitting device 11n in accordance with the instruction of the retransmission system control device 14, so that the processes other than the satellite digital retransmitting device 11a are performed. Satellite digital retransmission equipment 11
The version up of the control software such as b can be completed to return to the original operation state.

In step 509, since the system change request has been completed for the purpose of updating the equipment, the process ends.

As described above, even the retransmitting device 1 in the cable television according to the second embodiment uses the satellite digital retransmitting device 11n, which is a spare retransmitting device that does not provide the service, in accordance with the equipment update. The time during which the output of each operating satellite digital retransmitting device is cut off can be reduced as much as possible, and the equipment can be updated without stopping the service accompanying the equipment update. Further, it is possible to update the control software for the equipment update of the operating satellite digital retransmitting device 11a and the satellite digital retransmitting device 11b by using information transmitted via satellite digital broadcasting.

FIG. 6 is a configuration diagram showing a retransmission device in a cable television according to Embodiment 3 of the present invention, and shows a configuration example in the case of transmitting a satellite digital broadcast by CATV. FIG.
, 61a, 61b, 61n are satellite digital retransmission equipment, 611a, 611b, 611n are BS digital reception demodulation circuits, 612a, 612b, 612n are BS digital reception control circuits, 613a, 613b, 613n,
614a, 614b, 614n are digital data information change / add circuits, 615a, 615b, 615n, 616
a, 616b, 616n are 64QAM modulation circuits, 617
a, 617b, 167n are digital data information description control circuits, 618a, 618b, 618n are 64QAM modulation control circuits, 619a, 619b, 619n are information separation circuits, and 620a, 620b, 620n are information detection circuits.

In the third embodiment, satellite digital broadcasting
The transmission capacity of one repeater is CATV like S digital broadcasting
This is an example of a case where information is transmitted by a plurality of TS systems within a transmission capacity of 1 time or more and within 2 times or more, and corresponds to a method in which information is transmitted via digital satellite broadcasting.

In FIG. 6, two digital signals are transmitted for one satellite digital broadcast.
Digital data information change / addition circuit and two 64Q
Each of the satellite digital retransmitting devices 61a, 61b, and 61n includes one BS digital reception / demodulation circuit 611a, 611b, 611n, and one BS digital demodulation circuit.
Digital reception control circuits 612a, 612b, 612n and two digital data information change / add circuits 613a, 6
13b, 613n, 614a, 614b, 614n and 2
64QAM modulation circuits 615a, 615b, 615
n, 616a, 616b, and 616n, and a digital data information description control circuit 617 as their control circuit.
a, 617b, 167n, 64QAM modulation control circuit 61
8a, 618b and 618n. Similarly to FIG. 4, in order to cope with a method in which information is transmitted via satellite digital broadcasting, information separation circuits 619a, 619b, 619
n and information detection circuits 620a, 620b, 620n. When information is not transmitted via satellite digital broadcasting as shown in FIG. 1, the information separating circuit 619a,
619b, 619n and information detection circuits 620a, 620
b and 620n are unnecessary.

In FIG. 6, the satellite digital retransmitting device 61
Reference numerals a and 61b denote retransmission devices that operate a service, and satellite digital retransmission device 61n is a retransmission device that does not provide a service and is reserved.

In the retransmitting apparatus 1, the BS digital receiving / demodulating circuits 611a, 611b, and 611n in the satellite digital retransmitting equipment 61a, 61b or 61n transmit digital demodulation of a selected channel, error correction, and energy transmission. MPEG-TS digital data is obtained by separating a plurality of TSs transmitted in the decoded BS digital broadcast. The satellite digital reception control circuit 612a, 612b or 612n is a satellite digital reception demodulation circuit 611a,
611b or 611n.

The BS digital reception / demodulation circuits 611a, 61
The MPEG-TS digital data obtained by 1b or 611n is added to two digital data information change / addition circuits 613a, 614a, 613b, 614b or 613n, 614n in the satellite digital retransmission equipment 61a, 61b or 61n, respectively. . Digital data information change / addition circuit 613a, 614a, 613b, 61
In 4b or 613n, 614n, digital data obtained by converting BS digital broadcast information into CATV information or adding CATV transmission frequency information by 64QAM modulation is 615a, 616a, 615b, 616b.
Alternatively, the 64QAM signal transmitted to 615n, 616n and output from the 64QAM modulation circuit 615a, 616a, 615b, 616b or 615n, 616n is frequency-multiplexed by the synthesis circuit 12 and transmitted to the transmission line 3. Digital data information description control circuit 617a, 617
b or 617n is a digital data information change / addition circuit 613a, 614a, 613b, 614b or 6
13n and 614n, 64QAM modulation control circuits 618a, 618b and 618n are control circuits for 64QAM modulation circuits 615a, 616a, 615b and 616b or 615n and 616n. Information detection circuit 620a, 620b or 620n of the output of BS digital reception / demodulation circuit 611a, 611b or 611n
If the control software is scheduled to be updated, a spare satellite digital retransmission device 61 is transmitted via the retransmission system controller 14.
n is prepared for updating the control software by downloading. When the download is started, the control software separated from the output of the BS digital reception demodulation circuit 611a, 611b or 611n by the information separation circuit 619a, 619b or 619n is transmitted to the BS digital reception control circuit 61.
2a, 612b or 612n or a digital data information description control circuit is sent to the reception control circuit 617a, 617b or 617n.

A process of updating equipment for upgrading control software of a retransmitting device in a cable television according to Embodiment 3 of the present invention will be described with reference to FIG.

In step 701, the information detection circuit 620a or 620b detects the update schedule of the control software at the output of the BS digital reception / demodulation circuit 611a or 611b, and transmits the information to the retransmission system controller 14.

At step 702, the retransmission system controller 14 issues a system change request.

At step 703, the satellite digital retransmitting device 61n, which operates the spare satellite digital retransmitting device 61n, is operated according to an instruction from the retransmission system control device 14.
In order to replace with a, the BS digital reception demodulation circuit 611n changes the BS digital broadcast reception channel and the 64QAM modulation control circuit 618 via the BS digital reception control circuit 612n with the information from the retransmission system control device 14.
n, except that the modulation frequency settings of the 64QAM modulation circuits 615n and 616n are changed for updating the equipment by changing the modulation frequency setting of the 64QAM modulation circuits 615n and 616n. 618n
Is a state in which the 64QAM signal is not output.

At step 704, the control software separated from the output of the BS digital reception demodulation circuit 611n by the information separation circuit 619n is transmitted to the BS digital reception control circuit 61
2n or digital data information description control circuit 617n
Change the control software.

In step 705, the satellite digital retransmitting device 61n, which is a spare whose control software has been changed, is
Is replaced with the satellite digital retransmitting device 61a, which is in operation, by using information from the retransmission system controller 14 as 6
After cutting off the 64QAM modulation signals output from the 64QAM modulation circuits 615a and 616a in the satellite digital retransmission equipment 61a in operation via the 4QAM modulation control circuit 618a, the 64QAM information is output from the retransmission system control device 14. The 64QAM modulation signals of the 64QAM modulation circuits 615n and 616n in the spare satellite digital retransmission device 61n are output via the modulation control circuit 618n. By this step 705, the satellite digital retransmitting device 61n, which is a backup, is replaced with the satellite digital retransmitting device 61a, which is in operation, and the control software of the satellite digital retransmitting device 61a, which is in operation, is changed to Ready to upgrade.

In step 706, the 64QAM modulation control circuit 618a in the satellite digital retransmission equipment 61a is in a state where no 64QAM signal is output, and the BS
The control software separated from the output of the digital reception demodulation circuit 611a by the information separation circuit 619a is changed to the control software of the BS digital reception control circuit 612a or the digital data information description control circuit 617a.

In step 707, in order to replace the satellite digital retransmitting device 61a whose control software has been changed with the satellite digital retransmitting device 61n that is operating as a substitute, the information from the retransmitting system control device 14 is used.
64QAM modulation circuit 615n in satellite digital retransmission equipment 61n via QAM modulation control circuit 618n,
After cutting off the 64QAM modulated signal, which is the output of 616n, 64QA with information from the retransmission system controller 14
64Q in the satellite digital retransmitting device 61a that has completed the control software change via the M modulation control circuit 618a.
It outputs a 64QAM modulation signal of the AM modulation circuits 615a and 616a. By this step 707, the satellite digital retransmitting device 61a, which was originally operating, becomes active instead of the satellite digital retransmitting device 61n which is operating instead, and the control software of the operating satellite digital retransmitting device 61a is operated. The upgrade can be completed and the original operation status can be restored.

In step 708, the processes of steps 703 to 707 are performed by the satellite digital retransmitting device 61b and the satellite digital retransmitting device 61n in accordance with the instruction of the retransmission system control device 14, so that the processes other than the satellite digital retransmitting device 61a are performed. Satellite digital retransmission equipment 61
The version up of the control software such as b can be completed to return to the original operation state.

In step 709, the system change request has been completed for the purpose of updating the equipment, so the processing ends.

As described above, even the retransmitting device 1 in the cable television according to the third embodiment uses the satellite digital retransmitting device 61n, which is a spare retransmitting device that does not provide a service, to update the equipment. The time during which the output of each operating satellite digital retransmitting device is cut off can be reduced as much as possible, and the equipment can be updated without stopping the service accompanying the equipment update. Further, it is possible to update the control software for the equipment update of the operating satellite digital retransmitting device 61a and the satellite digital retransmitting device 61b by using information transmitted via satellite digital broadcasting.

In the cable television transmitting apparatuses according to the first to third embodiments, a configuration example in the case of transmitting a satellite digital broadcast by CATV has been described. However, the present invention is not limited to a satellite digital broadcast retransmission system. It goes without saying that a retransmission system for terrestrial digital broadcasting may be used.

As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the embodiments of the present invention, and can be variously modified without departing from the gist thereof. Of course.

[0085]

According to the present invention, the spare satellite digital retransmitting device that is not providing the service is replaced with the satellite digital retransmitting device which is the operation to be replaced by replacing the spare satellite digital retransmitting device with the control software. The spare equipment can be used as a spare, and the other active satellite digital retransmitting equipment can be sequentially replaced with the spare equipment. The disconnection time can be shortened as much as possible, and the equipment can be renewed without stopping the service accompanying the renewal of the equipment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a retransmission device and a reception device in a cable television according to an embodiment of the present invention;
It is a figure which shows the example of a structure at the time of retransmitting CATV of a satellite digital broadcast.

FIG. 2 is a flowchart for explaining an embodiment of the operation of the retransmission device in the cable television according to FIG. 1 of the present invention.

FIG. 3 is a flowchart for explaining an embodiment of the operation of the retransmission device in the cable television according to FIG. 1 of the present invention.

FIG. 4 is a configuration diagram illustrating a retransmission device in a cable television according to an embodiment of the present invention, and is a diagram illustrating a configuration example when a satellite digital broadcast is retransmitted on a CATV.

FIG. 5 is a flowchart for explaining an embodiment of the operation of the retransmission device in the cable television according to FIG. 4 of the present invention.

FIG. 6 is a configuration diagram illustrating a retransmission device in 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 CATV retransmitted.

FIG. 7 is a flowchart for explaining one embodiment of the operation of the retransmission device in the cable television according to FIG. 6 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Retransmission apparatus, 2 ... Receiving apparatus, 3 ... Transmission path, 10 ... Satellite broadcasting receiving antenna, 11a, 11b, 11n, 61
a, 61b, 61n ... satellite digital retransmission equipment, 12 ...
Combining circuit, 13, 14,... Retransmission system controller, 21
... Frequency selection circuit, 22 ... 64 QAM demodulation circuit, 23 ...
MPEG-TS packet separation circuit, 24: MPEG video decoder circuit, 25: audio decoder circuit, 26
... Display device on receiving terminal side, 111a, 111b, 111
n: Satellite digital reception / demodulation circuit, 112a, 112b,
112n: Satellite digital reception control circuit, 113a, 11
3b, 113n, 613a, 613b, 613n, 61
4a, 614b, 614n ... Digital data information change
Additional circuits, 114a, 114b, 114n, 617a,
617b, 167n: Digital data information description control circuit, 115a, 115b, 115n, 615a, 615
b, 615n, 616a, 616b, 616n ... 64Q
AM modulation circuit, 116a, 116b, 116n, 618
a, 618b, 618n... 64QAM modulation control circuit, 1
17a, 117b, 117n, 619a, 619b, 6
19n: information separation circuit, 118a, 118b, 118
n, 620a, 620b, 620n ... information detection circuit, 6
11a, 611b, 611n ... BS digital reception demodulation circuit, 612a, 612b, 612n ... BS digital reception control circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/38 H04N 7/16 Z 7/16 G06F 9/06 640A (72) Inventor Takatoshi Josugi Kanagawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi F-term (reference) 5D076 BB06 5C025 AA01 DA01 5C064 BA01 BB10 BC16

Claims (5)

[Claims] 1. A digital broadcast retransmitting apparatus for a digital cable television for receiving and retransmitting digital broadcasts, comprising: a main digital retransmitting means for digitally modulating and adding the received digital broadcast data after changing and adding the received digital broadcast data; A sub-digital retransmitting unit for digitally modulating and outputting the received digital broadcast data after changing and adding; and a control unit for controlling operations of the main digital retransmitting unit and the sub digital retransmitting unit. Synthesizing means for synthesizing the outputs of the main digital retransmission means and the sub digital retransmission means; operating the sub digital retransmission means by the control means; A digital broadcast retransmitting device characterized by updating a unit. 2. A digital broadcast retransmitting apparatus for a digital cable television for receiving a digital broadcast, digitally modulating the digital broadcast again, and retransmitting the digital broadcast. Operational digital retransmitting means for outputting the digitally modulated signal again after the change is added, and M spare digital retransmitting means for outputting the digitally modulated signal again after the received data information of the digital broadcast is changed and added, Control means for controlling the operation of the M standby digital retransmission means and the N operation digital retransmission means; and the outputs of the N operation digital retransmission means and the M standby digital retransmission means. Synthesizing means for synthesizing, and operating the N number of backup digital retransmission means by the control means to operate the N number of Digital broadcast retransmission apparatus, characterized in that the sequential all of said N number of operational digital retransmission means by a part for equipment replacement of digital retransmission means for updating equipment. 3. A digital broadcast retransmission apparatus for a digital cable television for receiving a digital broadcast, digitally modulating again, and retransmitting the digital broadcast, comprising: a digital broadcast receiving means for receiving a digital broadcast and outputting received signal data; Information change adding means for converting and adding internal information of output data of the digital broadcast receiving means; digital modulation means for outputting a signal which is digitally modulated by the output data of the information change adding means and retransmitted; N operation digital retransmission units comprising: a digital broadcast reception control unit for controlling a unit; an information change addition control unit for controlling the information change addition unit; and a digital modulation control unit for controlling the digital modulation unit. Digital broadcast receiving means for receiving a digital broadcast and outputting the received signal data; Information change adding means for converting and adding the internal information of the output data of the digital broadcast receiving means; digital modulation means for outputting a signal which is digitally modulated by the output data of the information change adding means and retransmitted; M digital backup reception control means for controlling the means, information change addition control means for controlling the information change addition means, and digital modulation control means for controlling the digital modulation means. Control means for controlling at least one of the M preliminary digital retransmission means, the N broadcast digital retransmission means, the digital broadcast reception control means, the information change addition means, and the digital modulation means. A synthesizing unit for synthesizing outputs of the M digital retransmitting units and the N digital retransmitting units, By operating the M standby digital retransmitting units by control means, equipment of some of the N operating digital retransmitting units is updated to sequentially update all the N operating digital retransmitting units. A digital broadcast retransmitting device. 4. A digital broadcast retransmission apparatus for a digital cable television for receiving a digital broadcast, digitally modulating again, and retransmitting the digital broadcast, comprising: a digital broadcast receiving means for receiving a digital broadcast and outputting received signal data; Information change adding means for converting and adding internal information of output data of the digital broadcast receiving means; digital modulation means for outputting a signal which is digitally modulated by the output data of the information change adding means and retransmitted; Digital broadcast reception control means for controlling means; information change addition control means for controlling the information change addition means; digital modulation control means for controlling the digital modulation means; and output data from the digital broadcast reception means. Information detecting means for detecting change start information; and output data of the digital broadcast receiving means. Digital broadcasting receiving means for receiving N digital broadcasting and outputting received signal data; and N digital broadcasting receiving means for receiving digital broadcasting and outputting received signal data. Information change addition means for converting and adding internal information of output data; digital modulation means for outputting a signal which is digitally modulated with the output data of the information change addition means and retransmitted; and digital for controlling the digital broadcast reception means Broadcast reception control means, information change addition control means for controlling the information change addition means, digital modulation control means for controlling the digital modulation means, and change start information detected from output data of the digital broadcast reception means Information detecting means for performing the change, and information separating means for separating the change information from the output data of the digital broadcast receiving means. M spare digital retransmitters are provided, and when one of the information separating means of the N operational digital retransmitters detects the change start information, the M spare digital retransmitters are provided. A transmission unit and a transmission unit for transferring and controlling the change information separated by the information separation unit of the N operation digital retransmission units to at least one of the digital broadcast reception control unit, the information change addition unit, and the digital modulation unit. Transmitting control means; and synthesizing means for synthesizing outputs of the M digital retransmitting means and the N digital retransmitting means, wherein the retransmission controlling means operates the M standby digital retransmitting means. By updating the equipment, a part of the N operational digital retransmission units is sequentially updated, thereby sequentially updating all the N operational digital retransmission units. Digital broadcasting re-transmission apparatus for. 5. A digital broadcast retransmitting apparatus for a digital cable television for receiving a digital broadcast, re-modulating the digital broadcast again, and retransmitting the digital broadcast, wherein the digital broadcast receives the digital broadcast and separates the received signal data into a plurality of data outputs. Reception separation means, a plurality of information change addition means for converting and adding internal information of output data of the digital broadcast reception separation means, and a signal which is digitally modulated and retransmitted by the output data of the plurality of information change addition means. A plurality of digital modulation means for outputting; a digital broadcast reception control means for controlling the digital broadcast reception separation means; a plurality of information change addition control means for controlling the plurality of information change addition means; and the plurality of digital modulation means. A plurality of digital modulation control means for controlling; and starting change from output data of the digital broadcast reception separation means. N operation digital retransmitting means comprising information detecting means for detecting information, and information separating means for separating change information from the output data of the digital broadcast receiving / separating means. Digital broadcast reception separation means for separating the received signal data into a plurality of data outputs, a plurality of information change addition means for converting and adding internal information of output data of the digital broadcast reception separation means, and the plurality of information change additions A plurality of digital modulation means for outputting a signal which is digitally modulated by the output data of the means and retransmitted; a digital broadcast reception control means for controlling the digital broadcast reception separation means; and a control means for the plurality of information change addition means. A plurality of information change addition control means; a plurality of digital modulation control means for controlling the plurality of digital modulation means; and the digital broadcast M spare digital units each comprising: information detection means for detecting change start information from output data of the signal separation means; and information separation means for separating change information from output data of the digital broadcast reception separation means. Re-transmitting means, and in response to any of the information separating means of the N operational digital re-transmitting means detecting the change start information, the M standby digital re-transmitting means and the N operational Retransmission control means for controlling transfer of the change information separated by the information separation means of the digital retransmission means to at least one of the digital broadcast reception control means, the information change addition means, and the digital modulation means; And a synthesizing means for synthesizing the outputs of the N digital retransmitting means. The retransmission control means controls the M standby digital retransmitting means. Digital broadcasting retransmission characterized by sequentially updating all the N operation digital retransmission means by updating a part of the N operation digital retransmission means by operating the communication means. apparatus.