JPH0946686A - Transmitter-receiver in two-way catv system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operation of a video-on-demand-service at a hotel or the like by providing a means commanding a reception channel to a terminal equipment corresponding to a service channel set by a channel setting control means via a 2-way communication means. SOLUTION: An operation management computer 11b of a service center 11 discriminates which of terminal equipments 15 is possibly used based on check-in-out information from a host computer 11h and a video-on-demand service utility state of each of terminal equipments 15a-15n based on a request content from the terminal equipment 15. The computer 11b executes processing of CIO information of a guest room and processes discrimination of the guest room check-in-out information. When check-in is discriminated, a released channel with a minimum number is allocated. The computer 11b discriminates a power on/off state of a multiplexer 11d and a modulator 11e of the channel. The computer 11b commands a transmission channel allocated to the terminal equipment 15 based on the service start request from the terminal equipment 15. The terminal equipment 15 receives a service signal and realizes the video- on-demand service.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter / receiver in a two-way CATV (cable television) system for a video-on-demand service operated in a hotel or the like.

[0002]

2. Description of the Related Art As is well known, with the digitization of television signals (from signal processing to transmission), CATV has been developed to provide a large number of programs. In recent years, CATV is capable of increasing the number of channels (the number of programs) by 4 to 10 times with the same frequency bandwidth as the current broadcast wave.

The CATV is connected to a television, a communication network, a computer, etc.
It will be effective in adopting a video-on-demand service as a new service. The video-on-demand service is a cable (telephone line, etc.) drawn into each home from a service center that has an information storage and provision system that provides a wealth of information such as movies and games.
It is realized using a network, and the service center and viewers are connected by a bidirectional transmission path. That is, the video-on-demand service can immediately provide each household with information required by the viewer, such as movies, dramas, news programs, games, shopping, ticket information, and the like.

FIG. 8 shows the structure of a transmitter / receiver in a conventional CATV system for realizing a video-on-demand service in a hotel, for example. In FIG.
Reference numeral 11 in the figure denotes a service center, which is connected to n terminals 131 to 13n via a cable 12 and is capable of bidirectional communication. The upstream signal transmitted from any one of the n terminals 131 to 13n is supplied to the modem 11a. The modem 11a has n terminals 131 to 13
It is communicating with n.

Here, the terminal 131 will be described as an example. The modem 11a demodulates the upstream signal from the terminal 131 and supplies it to the operation management computer 11b. Further, the modem 11a manages the operation of the system so as to modulate the data from the operation management computer 11b and transmit the data to the requesting terminal 131. The operation management computer 11b further gives an instruction signal to the server 11c.

The server 11c stores a large number of digitally compressed television signals and outputs the stored data to a plurality of multiplexers 11d1 to 11dn / 5 based on an instruction signal from the operation management computer 11b. are doing. One of the multiplexers 11d1 to 11dn / 5 can multiplex data of, for example, 5 channels (CH). That is, one multiplexer 11d1 time-division-multiplexes the five input data, performs transmission processing such as error correction, and outputs the data to the corresponding modulator 11e1.

The modulators 11e1 to 11en / 5 correspond to the multiplexers 11d1 to 11dn / 5. The input data are subjected to digital modulation processing, and the frequency multiplexer 11
It is output to f. The frequency multiplexer 11f multiplexes the frequency components of the signals supplied from the modulators 11e1 to 11en / 5, and the terminals 131 to 13n via the cable 12.
Send to each.

FIG. 9 shows the details of one terminal 131. That is, the service signal S1 from the service center 11 supplied to the input terminal 13a is received by the tuner circuit 13b. The tuner circuit 13b receives the instructed channel based on the signal h output from the microprocessor 13c, and outputs the reception signal S2 to the demodulation circuit 13d. The demodulation circuit 13d subjects the input reception signal S2 to digital demodulation processing, and supplies the demodulation signal S3 thus obtained to the multiplexing and decoding circuit 13e.

The multiplexing / decoding circuit 13e performs transmission processing such as error correction of the input demodulated signal S3, and also requests the service signal S from the demodulated signal S3 in the time division multiplex state.
4 is taken out and outputted to the decoder circuit 13f. The decoder circuit 13f decodes the digitally compressed service signal S4 and outputs the decoded signal to the image synthesizing circuit 13g as a television signal S5.

On the other hand, the microprocessor 13c is
The remote control circuit 13h responding to the input operation of the user operates to display the requested menu mode on the television screen. Then, the menu mode selected by the remote control circuit 13h is changed to the RAM (Random Access Mem) by the microprocessor 13c.
mory) 13i and simultaneously output to the graphics circuit 13j. The data already written in the RAM 13i is read by the microprocessor 13c and output to the graphics circuit 13j.

The graphics circuit 13j generates graphics or the like for display on the television screen based on the data output from the microprocessor 13c, and outputs the signal S6 to the image synthesizing circuit 13g. The image synthesizing circuit 13g receives the television signal S5 output from the decoder circuit 13f and the graphics circuit 1
The signal S6 output from 3j is combined to obtain a television signal S7, and the television signal S7 is output to the television screen.

Further, the microprocessor 13c transmits the menu mode selected by the remote control circuit 13h to the service center 11 via the modem 13k. Further, the user can perform bidirectional communication with the service center 11 through the microprocessor 13c.

By the way, in order to provide the video-on-demand service to all the guest rooms of the hotel, in fact, it is necessary to always secure channels corresponding to the number of guest rooms. That is, the terminal in each guest room is connected to the service center 11 through a fixed service channel.

FIG. 10 shows allocation of service channels. Here, it is assumed that 5 channels are multiplexed and transmitted in a 6 MHz band by time division multiplexing. Then
For example, when the number of guest rooms is 500, 600 MHz {(50
0/5) × 6} transmission band, the multiplexing device 11d and the modulation device 11e of the service center 11 each have 100
A table (500/5) is required. Also, one service channel CH1 to CHn is assigned to each of the terminals 131 to 13n.

Here, the problem is that the hotel does not always have full rooms, and depending on the season and the day of the week in the area where the hotel is located, the operating status of the guest room and the usage status of the video-on-demand service may vary. It means being affected.

Further, in digital transmission, a constant image quality can be obtained up to the threshold C / N (correlation with the transmission error rate) level of the received signal, but the received signal has a threshold value. When the level exceeds, the image quality deteriorates rapidly, and the defective portion must be repaired or the transmission channel must be changed.

In the two-way communication, when requests from a plurality of terminals to the service center are concentrated, the service response of the video-on-demand service deteriorates, and it takes time until the requests from the terminals are realized. Will take a long time.

In a system in which fixed channels are assigned to each guest room of the hotel, the service center is always in full operation, so the guest room operation status and video-on
There is an inconvenience that an optimum system and a video-on-demand service cannot be realized according to the usage situation of the demand service.

[0019]

As described above, in the transmitter / receiver in the conventional bidirectional CATV system, when the received signal exceeds the C / N range of the threshold value, the image quality suddenly deteriorates. , The defective part must be repaired or the transmission channel must be changed, and if the requests from multiple terminals to the service center are concentrated, the service response of the video-on-demand service deteriorates, There is a problem that it takes a long time to fulfill the request from the terminal. Furthermore, in a system in which fixed channels are assigned to each guest room in a hotel, the service center is always in full operation, so the optimal system and video on-demand system according to the operating status of rooms and video-on-demand service usage -It also has the inconvenience of not being able to realize demand services.

An object of the present invention is to provide a transmitting / receiving device in a two-way CATV system which can improve an operation system and serviceability when operating a video-on-demand service in a hotel or the like.

[0021]

Bidirectional C according to the present invention
A transmitter / receiver in the ATV system is provided between a service center for setting a plurality of service channels, a plurality of terminals connected to the service center via a cable, and each of the terminals and the service center. A transmission / reception device in a two-way CATV system provided with a two-way communication means for performing communication via the.

Then, the service center decides whether or not to set a service channel for each terminal based on the information of the terminal managing means for managing the usage status of the plurality of terminals, and the information of the terminal managing means, and A channel setting control means capable of updating and changing, and a terminal corresponding to the service channel set by the channel setting control means via the two-way communication means, an instruction means for instructing the receiving channel to the terminal. Is provided.

Further, the transmitting / receiving device in the bidirectional CATV system according to the present invention is, in the above object, an error rate measuring means for measuring the transmission error rate of the signal of the service channel transmitted from the service center to each terminal. By comparing the level of the transmission error rate, which is the measurement result of the error rate measuring means, with a predetermined threshold level,
When the transmission error rate exceeds the threshold value by the determination means for determining the state of the transmission error rate, the terminal sends the determination result that the threshold value has been exceeded to the service center and displays a message on the service screen. A switching control means for controlling to switch to the screen is provided.

Further, in the transmitter / receiver in the interactive CATV system according to the present invention, in the above object, each terminal has a storage means for measuring and storing the number of communication tries to the service center, and content data of the storage means. Is used as a parameter, and a service / response charging means for charging a service / response is provided.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 8 is different from FIG. 8 in that the signal b for controlling the power supplies of the multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 11en / 5 from the operation management computer 11b in the service center 11.
1 to bn / 5 and c1 to cn / 5 are output.
Further, the operation management computer 11b controls the power supply and the processing operation of the information input management device 11g.

Then, the operation management computer 11b is
It is connected to the host computer 11h of the hotel, the guest room operating status such as check-in / out of the guest room, and the video-on received from the terminals 151 to 15n.
Demand service utilization status information input management device 11g
Enter and manage.

FIG. 2 is a flow chart for explaining the operation of the operation management computer 11b. In this flowchart, the operation management computer 11b determines which terminal 15 is likely to be used by the check-in / out information from the host computer 11h, and the content of the request from the terminal 15 causes the individual terminals 1 to operate.
The video-on-demand service utilization status of 51 to 15n is determined. That is, the host computer 11
When it is started by inputting the check-in / out information of the guest room from h (step S11), the operation management computer 11b reads the check-in / out information of the guest room in step S12, and then in step S1.
In step 3, processing is executed based on the read check-in / out information of the guest room.

In step S13, the operation management computer 11b executes a process of determining whether the guest room is checked in or checked out. If it is determined that the check-in is performed, the operation management computer 11b stores the terminal number of the checked-in guest room in step S14, and uses the smallest released number in step S15. Search for possible channels. Then, in step S16, first in step S1.
The channel searched in step S15 is assigned to the terminal 15 stored in step 4.

The operation management computer 11b is
In step S17, the multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 1 corresponding to the assigned channels are
Determine the on / off status of the 11en / 5 power supply. Here, if it is determined that the service is on, the operation management computer 11b waits for a service start request from the terminal 15 in step S18. In addition, when it is determined that the operation management computer 11b is in the off state, the operation management computer 11b turns on the power supplies of the multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 11en / 5 in step S19.
It is turned on by n / 5 and c1 to cn / 5, and step S1
Proceed to 8.

Here, the operation management computer 11b is
In step S18, when the service start request is issued from the terminal 15, the transmission channel assigned to the terminal 15 is designated (step S20). After that, step S21
Then, the terminal 15 receives the service signal, and the video-on-demand service is realized there (step S22).

On the other hand, when it is determined in step S13 that the check-out is performed, the operation management computer 1
1b stores the terminal number of the guest room checked out in step S23. Then, step S24
Then, the transmission channel assigned to one of the terminals 151 to 15n in the checked-out guest room is searched, and the transmission channel is released in step S25.

Next, in step S26, the operation management computer 11b searches for any of the multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 11en / 5 corresponding to the transmission channel released in the previous step S25. ,
In step S27, the searched multiplexing devices 11d1 to 11d are searched.
It is determined whether or not there is a transmission channel assigned to any one of dn / 5 and modulators 11e1 to 11en / 5.
If there is an assigned transmission channel, the operation management computer 11b ends the processing operation as it is (step S28). If there is no assigned transmission channel, the operation management computer 11b
In step S29, one of the searched multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 11en / 5 is turned off by the signals b1 to bn / 5 and c1 to cn / 5, and the processing is terminated (step S29). S28).

FIG. 3 shows the details of the information input management device 11g. In FIG. 3, reference numeral 14 in the drawing is a channel mapping table, which shows a state for each channel number. Here, the terminal 155 assigned to channel number 4 (referred to as terminal number 5) has finished the video-on-demand service. The channel mapping table 14 composed of a RAM, a rewritable ROM, and the like is based on the channel number, whether or not the channel can be used, the terminal number assigned to the transmission channel, and the multiplexers 11d1 to 11dn /.
5 ・ It corresponds to the numbers and the power states of the modulators 11e1 to 11en / 5. In addition, the transmission channel that is not assigned has the terminal number defined as being released by a number or symbol that is not defined in the terminal number such as 0.

In FIG. 3, the guest room operation information and the video-on-demand service request content information supplied to the operation management computer 11b are stored in the storage device 11g1 such as a RAM. Operation management computer 11b
Controls the search circuit 11g2 and the rewriting circuit 11g3. Search circuit 11g2 and rewriting circuit 1
1g3 is for retrieving and rewriting the contents of the channel mapping table 14. Also, the search circuit 11
The functions of g2 and the rewriting circuit 11g3 may be incorporated in the operation management computer 11b.

FIG. 4 is a flow chart for explaining the operation of the operation management computer 11b and the information input management device 11g when there is a service request from the terminal 15 side. In this flowchart, the storage device 11g1 stores the terminal number 5 as the end of service, and this data is used as a parameter for the search circuit 11g2 and the rewriting circuit 11g3.
Shows the operation of rewriting the terminal number 5 of the channel number 4 in the channel mapping table 14 to the released state.

That is, when the operation management computer 11b is started by supplying the video-on-demand service request content information (step S30), the operation management computer 11b sends the video from the terminal 15 in step S31. On-demand service request content information is read, and in step S32, processing is executed based on the read request content.

If there is a service start request from the terminal 15 side, the operation management computer 11b first stores the terminal number of the guest room for which the service is requested in the storage device 11g1 in step S33. Write to channel mapping table 14. In the guest room in which this terminal number is stored, the operation management computer 1
In step S34, the 1b searches for the smallest available transmission channel having the smallest number. And
In step S35, the transmission channel searched in step S34 is assigned to the terminal number previously stored in step S33.

Then, the operation management computer 11b is
In step S36, the multiplexers 11d1 to 11dn / 5 and the modulator 11e corresponding to the assigned transmission channel.
The on / off state of any of the power sources 1 to 11 en / 5 is determined by the channel mapping table 14.
Here, if it is determined that the operation channel is in the ON state, the operation management computer 11b instructs the transmission channel assigned to the terminal 15 in step S37. If it is determined that the operation management computer 11b is off, the operation management computer 11b
In step S38, the multiplexers 11d1 to 11dn /
5 and any of the modulators 11e1 to 11en / 5 are turned on, and the process proceeds to step S37. Again,
The channel mapping table 14 is rewritten.

Here, the operation management computer 11b is
In step S37, the transmission channel assigned to the terminal 15 is designated. After that, in step S39, the terminal 15 receives the service signal, and the video-on-demand service is realized there (step S40).

On the other hand, when the service end is requested in step S32, the operation management computer 11b
In step S41, the terminal number of the guest room for which the service end is requested is stored in the storage device 11g1, and the channel mapping table 14 is rewritten. Then, in step S42, the stored transmission channel assigned to the terminal 15 is searched from the storage device 11g1 or the channel mapping table 14, and in step S43, the transmission channel is released. Also at this time, the channel mapping table 14 is rewritten.

Next, in step S44, the operation management computer 11b searches for any of the multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 11en / 5 corresponding to the transmission channel released in the previous step S43. ,
In step S45, the searched multiplexing devices 11d1 to 11d are searched.
It is determined whether or not there is a transmission channel assigned to any one of dn / 5 and modulators 11e1 to 11en / 5.
If there is an assigned transmission channel, the operation management computer 11b ends the processing operation as it is (step S47).

If there is no assigned transmission channel, the operation management computer 11b proceeds to step S4.
6, the multiplexers 11d1 to 11dn / 5 and the modulator 11e searched by the signals b1 to bn / 5 and c1 to cn / 5 are searched.
The power of any one of 1 to 11 en / 5 is turned off, and the process is ended (step S47). At this point, the operation management computer 11b has the channel mapping table 1
Rewrite to 4.

The operations of the operation management computer 11b and the information input management device 11g in the above flow chart may be performed based on only the contents stored in the storage device 11g1 or the contents of the channel mapping table 14. You may make it based on only.

As described above, the operation management computer 11b and the information input management device 11 in the service center 11
According to the processing operation of g.
The service center 11 changes the allocation of transmission channels to terminals in accordance with the demand service usage status, and the multiplexers 11d1 to 11dn / 5 and the modulators 11e1 to 1 are changed.
By controlling the power supply of 1en / 5, the system can always be operated with the center facility of the optimum scale.

When there is a service interruption request from the terminal 15 side, the service center 11
Pause the transmission channel corresponding to. That is,
The service screen on the terminal 15 side is in a suspended state.
Further, when the service content is unsuitable for the viewer on the terminal 15 side, the service center 11 ensures that the viewer does not feel uncomfortable due to the switching of the service screen.
Switch the transmission channel.

The terminal 15 side or the service center 1
In the event that a trouble occurs in the assigned transmission channel on the side 1 due to an accident or the like, the service center 11 switches to another released transmission channel so that the viewer does not feel uncomfortable.

FIG. 5 shows the details of the terminal 15. In FIG. 5, the same parts as those in FIG. The difference from FIG. 9 is that the error rate measuring circuit 15a is provided between the multiplex decoding circuit 13e and the microprocessor 13c.
And the determination circuit 15b is inserted and connected. That is, the error rate measuring circuit 15a measures the error rate from the signal S8 output from the multiplexing decoding circuit 13e, and outputs the signal S9 corresponding to the error rate to the determination circuit 15b.

The determination circuit 15b compares the level of the input signal S9 with the level of a preset threshold value, and outputs a signal S10 corresponding to the comparison result to the microprocessor 13c.

Further, the microprocessor 13c is provided with a routine for measuring the number of tries of communication to the service center 11, and the number of tries is stored in the RAM 13i which is a storage circuit for each day, week or month. It On the other hand, the service center 11 receives the information on the number of tries stored in the RAM 13i by bidirectional communication, and uses this as a parameter to calculate the charge for the service response.

FIG. 6 is a flow chart for explaining the operation between the error rate measuring circuit 15a, the judging circuit 15b, the microprocessor 13c and the service center 11. That is, when the signal S8 output from the multiplexing / decoding circuit 13e is started by being supplied to the error rate measuring circuit 15a (step S50), the error rate measuring circuit 15a causes the error rate of the signal S8 in step S51. The measurement process of is executed.

Next, the signal S9 subjected to the error rate measurement processing by the error rate measurement circuit 15a is subjected to level comparison with a preset threshold value by the determination circuit 15b in step S52. The determination circuit 15b uses this step S5.
2, based on level comparison of the signal S9 with a threshold value,
The determination process of the error rate of the signal S9 is executed.

This determination process is for determining whether or not the error rate of the signal S9 is equal to or higher than the threshold value. When it is determined that the error rate is equal to or lower than the threshold value, the determination circuit 15b causes the microprocessor 13c to operate. Output to (step S5
3). When it is determined that the error rate of the signal S9 is equal to or higher than the threshold value, the determination circuit 15b outputs the determination result to the microprocessor 13c.

Then, in step S54, the microprocessor 13c transmits the determination result that the threshold value is exceeded to the service center 11 via the modem 13k. At this time, the service center 11 performs step S5.
At 5, the service screen is suspended. After that, the terminal 15 determines in step S56 that the graphics circuit 13
A message screen is created by j and the image composition circuit 13
Switch to the message screen with g. At this time, on the message screen, for example, a message “image quality may be deteriorated. Please wait a moment.” Is displayed.

Then, in step S57, the service center 11 searches for the released transmission channel,
In step S58, the reception channel change instruction is transmitted to the terminal 15. Here, the terminal 15 determines in step S59.
Then, the reception channel is changed, and in step S60, the image composition circuit 13g switches to the service screen.

Then, the service center 11 restarts the temporarily stopped service screen in step S61,
In step S62, the channel availability of the channel mapping table 14 in the information input management device 11g is rewritten to NG, and the process ends here (step S5).
3).

According to such an operation process, the information about the image quality of the reception channel (error rate) is transmitted from the terminal 15 to the service center 11, and the service center 11 switches to another transmission channel, so that the viewer is always The service can be received with a certain image quality, which improves the serviceability.

On the other hand, the microprocessor 13c operates as shown in the flowchart of FIG. 7 by providing a routine for measuring the number of communication tries to the service center 11. First, when started (step S71), the microprocessor 13c operates in step S72.
Then, the number of tries of communication to the service center 11 is measured. The result of this measurement is the RAM 13 in step S73.
stored in i.

Thereafter, the service center 11 requests the information on the number of tries stored in the RAM 13i from the terminal 15 side in step S74, and receives the information on the number of tries in step S75. And the service center 11
In step S76, the service / response charge is calculated using the number of tries as a parameter, and the process ends here (step S77).

As described above, the microprocessor 13c in the terminal 15 measures the number of communication tries and determines the RAM1.
By storing in 3i, the service response can be charged with the number of tries as a parameter, and the serviceability to the viewer is improved.

In the above embodiment, the cable 12 is used.
With respect to the above, what is used is not limited, but the cable 12 may be an optical cable for high-speed optical communication.

[0061]

As described above in detail, according to the present invention,
It is possible to provide a transmitter / receiver in an interactive CATV system that can improve the operation system and serviceability when operating a video-on-demand service in a hotel or the like.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a transmission / reception device in a bidirectional CATV system according to the present invention.

FIG. 2 is a flowchart shown to explain the operation of the operation management computer in the embodiment.

FIG. 3 is a block configuration diagram showing details of the information input management device in the embodiment.

FIG. 4 is a flowchart shown to explain the operation of the information input management device in the embodiment.

FIG. 5 is a block configuration diagram showing details of a terminal in the same embodiment.

FIG. 6 is a flowchart shown for explaining the operation between the terminal and the service center in the same embodiment.

FIG. 7 is a flowchart shown to explain the operation between the microprocessor in the terminal and the service center in the same embodiment.

FIG. 8 is a block configuration diagram showing a transmission / reception device in a conventional bidirectional CATV system.

FIG. 9 is a block configuration diagram showing details of a terminal in the conventional apparatus.

FIG. 10 is a transmission channel allocation diagram of a video-on-demand service operated by the conventional device.

[Explanation of symbols]

11 ... Service center, 11a ... Modem, 11b ... Operation management computer, 11c ... Server, 11d1-11
dn / 5 ... Multiplexing device, 11e1 to 11en / 5 ... Modulating device, 11f ... Frequency multiplexing device, 11g ... Information input management device, 11g1 ... Storage device, 11g2 ... Search circuit, 11g
3 ... Rewriting circuit, 11h ... Host computer, 12
... cable, 131 to 13n ... terminal, 13a ... input terminal, 13b ... tuner circuit, 13c ... microprocessor, 13d ... demodulation circuit, 13e ... multiplex decoding circuit, 13
f ... Decoder circuit, 13g ... Image combining circuit, 13h ... Remote control circuit, 13i ... RAM, 13j ... Graphics circuit, 13k ... Modem, 14 ... Channel mapping table, 15 ... Terminal, 151-15n ... Terminal, 15
a: error rate measurement circuit, 15b: determination circuit.

Claims (7)

[Claims] 1. A service center for setting a plurality of service channels, a plurality of terminals connected to the service center via a cable, and a terminal provided between each terminal and the service center. In a transmitter / receiver in a two-way CATV system including a two-way communication means for performing communication via a cable, the service center includes a terminal management means for managing usage status of the plurality of terminals, and a terminal management means for managing the usage status of the plurality of terminals. Channel setting control means capable of determining whether to set the service channel for each terminal based on information, and updating and changing the information; and the channel setting via the two-way communication means. The terminal corresponding to the service channel set by the control means is set to the receiving channel. Transceiver device in two-way CATV system characterized by comprising comprises an instruction means for instructing the terminal. 2. The terminal management means has a storage means for storing operation information from the terminal itself and terminal management information from an input device such as a passenger room management means, and the channel setting control means has the storage means. 2. The transmission / reception device in a two-way CATV system according to claim 1, further comprising a first channel determining means for allocating the service channel to each of the terminals by using the information stored in the above as a parameter. 3. The terminal management means includes a predetermined terminal and a channel assigned to the predetermined terminal, in addition to operation information from the terminal itself and terminal management information from an input device such as a passenger room management means. , And a table in which three of the multiplexers / modulators for this channel are associated with each other, the channel setting control means updates and changes the contents of the table, and the information of the table as parameters. 2. The transmitting / receiving apparatus in the bidirectional CATV system according to claim 1, further comprising: second channel determining means for allocating the service channel to each of the terminals. 4. The channel setting control means comprises a switching control means for controlling to individually switch on / off states of power supplies of the plurality of multiplexers / modulators based on the contents of the table. The transmitter / receiver in the bidirectional CATV system according to claim 3, wherein 5. A service center for setting a plurality of service channels, a plurality of terminals connected to the service center via a cable, and a terminal provided between each terminal and the service center. A transmission / reception device in a bidirectional CATV system, comprising: a bidirectional communication means for communicating via a cable, wherein each terminal measures a transmission error rate of a signal of the service channel transmitted from the service center. Error rate measuring means for determining, by comparing the level of the transmission error rate is a measurement result of the error rate measuring means and a predetermined threshold level, determining means for determining the state of the transmission error rate, If the transmission error rate exceeds the threshold value by the determination means, the terminal determines that the threshold value has been exceeded. It sends a result to the service center, transceiver device in two-way CATV system characterized by comprising; and a switching control means for controlling to switch the service screen to the message screen. 6. The two-way CATV according to claim 5, wherein, in the switching control means, the service center suspends the service, changes the service channel for the terminal, and continues the service.
A transceiver in the system. 7. A service center for setting a plurality of service channels, a plurality of terminals connected to the service center via a cable, and a terminal provided between each of the terminals and the service center. In a transmitter / receiver in a two-way CATV system including a two-way communication means for performing communication via a cable, each of the terminals has storage means for measuring and storing the number of communication tries to the service center, and the storage. A bidirectional CAT characterized by comprising service response charging means for charging a service response using the content data of the means as a parameter.
Transceiver in V system.