JPH08242436A - Two-way television reception system - Google Patents

Abstract

PURPOSE: To obtain the 2-way television reception system in which a program is watched on plural TV monitors, with ease of use and to make the circuit scale of the entire reception system small. CONSTITUTION: An output signal of a master receiver is modulated by an RF modulator 30, and the modulated signal is sent to a slave receiver through a transmission line 31. The slave receiver modulates the signal to reproduce a program. In this case, a control signal used to control a channel or the like of the master receiver is generated and it is multiplexed onto the signal sent from the master receiver through the transmission line 31 and the control signal is sent to the master receiver in a form of the multiplexed signal. The master receiver decodes the control signal to control a channel or the like on which a reproduced signal is in existence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way television receiving system, and more particularly to a distributor and a receiver for sending out a program by a route in which a plurality of digital TV signals and a plurality of analog TV signals are transmitted as a mixed signal. Connect to the side,
The present invention relates to a two-way television receiving system connectable to a cable television system in which any receiver can select an arbitrary program.

[0002]

2. Description of the Related Art FIG. 16 is a block diagram of a receiver of a conventional cable television receiving system. In the figure, 1 is an input terminal, 2 is a tuner, 3 is an analog TV decoder for reproducing an analog TV signal, and 4 is an analog TV decoder. A digital demodulator that demodulates a digital TV signal that is digitally modulated and sent,
5 decodes the demodulated digital data and digital T
Digital TV decoder for converting to V signal, 6 for D / A converter, 7 for changeover switch for selecting analog TV signal and digital TV signal, 8 for control signal to be sent to distribution source for reproducing arbitrary image A control signal modulator for modulation, 9 is a control signal demodulator for demodulating a control signal multiplexed with an input signal, 1
1 is a CPU.

Next, the operation will be described. The signal input to the input terminal 1 is, for example, a frequency-multiplexed signal as shown in FIG.

The analog TV signal band is, for example, a band of analog TV signals in which a signal of 6 MHz per channel occupies several tens of channels which is currently being broadcast. The digital signal band is, for example, a multi-channel digital TV signal band modulated by the QAM modulation method or the like.

The control signal band is a band for communication between the receiving side and the distributing side. This is a control signal for the distribution side to reproduce any program selected by the receiver, and the distribution side decodes this control signal,
Send a signal to the intended receiver. At this time, since a plurality of receivers use this band, the control signals from the respective receivers are multiplexed and transmitted by frequency multiplexing or time axis multiplexing.

This band is also used to send a control signal from the distribution side to the reception side.

A target signal of the TV signal input from the input terminal 1 is selected by the tuner 2. When the analog TV signal channel is selected, it is input and decoded by the analog signal decoder.

If the selected channel is a digital signal, it is input to the digital demodulator 3 and subjected to, for example, QAM demodulation. The demodulated digital signal is converted into a digital TV signal by a digital TV decoder. After that, D / A conversion is performed by the D / A converter 6.

The TV signal reproduced by the analog TV decoder 3 or the digital TV decoder 4 is switched by the switch 7 according to the channel selected by the tuner 2 and output from the receiver.

The present receiving system not only receives and reproduces a program which is broadcast on a predetermined channel like the current TV broadcasting, but also allows the distribution side to select any program other than broadcasting. With the function to call at the time of.

For this reason, it becomes necessary to send a control signal for requesting a program to the distribution side, and information from the distribution side to the receiving side, for example, which channel of which band the program is to be sent to. Need to send.

The control signal modulator 8 includes a CPU 11
The control signal to the distribution side, which is generated by, is modulated and further multiplexed by the multiplexer 10 into the control signal band shown in FIG.

The control signal sent from the distribution side is demodulated by the control signal demodulator 9 and taken out and sent to the CPU 11. The CPU 11 decodes this control signal, appropriately controls the tuner 2, the digital demodulator 4, the digital TV decoder 5, and the switch 7 to reproduce a required program.

[0014]

Since the conventional cable television receiving system is configured as described above, only one receiver can be connected to one TV monitor, and a program can be displayed on a plurality of TV monitors. When watching, for example analog TV
When viewing the digital TV and the digital TV separately, there is a problem that a receiver having a plurality of equivalent functions must be used.

The present invention has been made to solve the above problems, and an object thereof is to improve convenience when watching a program on a plurality of TV monitors.

Another object of the present invention is to reduce the circuit scale of the entire receiving system.

[0017]

According to another aspect of the present invention, there is provided a two-way television receiving system, which can be connected to a path for transmitting a plurality of analog TV signals and digital TV signals, and a distributor and a receiver which send out a program by each receiver. In a two-way receiving system that is connectable to a receiver side and can be connected to a system that allows each receiver to select an arbitrary program, a parent receiver connected to the distributor side, a child receiver, and the above parent receiver And a path connecting the child receiver to the child receiver, wherein the parent receiver transmits the program received and reproduced by the parent receiver to the child receiver through the path, and the child receiver is , Receive the program transmitted from the parent receiver,
Characterized in that it has at least one of a control means that has a reproducing means, is provided in the slave receiver and controls the master receiver, and a control means that is provided in the master receiver and that controls the slave receiver. And

According to a second aspect of the present invention, in the first aspect, the transmitting means of the parent receiver modulates a reception signal of the parent receiver and transmits the modulated signal to the child receiver. The receiving / reproducing means of (1) demodulates the signal modulated and sent from the parent receiver and then reproduces it.

A third aspect is the same as the first or second aspect,
As the control means, a control means provided in the slave receiver is used, and the control means generates a control signal for selecting a program sent from the master receiver, and the master receiver receives the control signal. It is characterized by being sent out.

A fourth aspect of the present invention is the signal processing apparatus according to any one of the first to third aspects, wherein the parent receiver includes a received signal of the parent receiver, a signal modulated for transmission to the child receiver, and a delivered signal. The slave receiver is provided with a unit for selecting any one of the multiplexed signals.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the parent receiver is distributed with first selecting means for selecting one analog signal from analog TV signals of a plurality of channels to be distributed. Second selection means for selecting one digital signal from digital TV signals of a plurality of channels, and two signals selected by the first and second selection means, and first and second outputs A selector switch capable of independently outputting one of the two signals from the terminal, and the output obtained from the first output terminal is used as an output for reproduction in the parent receiver, The output obtained from the second output terminal is transmitted to the slave receiver by the transmitting means.

A sixth aspect of the present invention is the signal processing apparatus according to any one of the first to fifth aspects, wherein the parent receiver demodulates and selects a plurality of channels of digital TV signals to be distributed, and selects channel selecting means and the selected signals. A signal modulating means for modulating the signal to be transmitted to a slave receiver, wherein the slave receiver has a reproducing means for separating, demodulating and reproducing the modulated digital signal transmitted from the master receiver. Characterize.

According to a seventh aspect of the present invention, in the sixth aspect, the parent receiver demodulates a plurality of digital TV signals to be distributed and selects the digital signals, and the selected signals are transmitted to the child receivers. The parent receiver further comprises a modulation unit that modulates to transmit, and a transmission unit that can transmit the signal output from the modulation unit in a plurality of channels,
And a control signal transmitting means capable of transmitting the channel information as a control signal to the slave receiver,
A plurality of receivers are provided as the child receivers, and each of the plurality of receivers has a reproducing means for separating, demodulating and reproducing the modulated digital signal transmitted from the parent receiver. .

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the parent receiver includes control signal generating means for controlling the child receiver, and the child receiver that modulates the generated control signal. Signal transmitting means for transmitting the control signal from the parent receiver, and the decoding means for decoding the received control signal.

According to a ninth aspect of the present invention, in the eighth aspect, a plurality of child receivers are connected to the parent receiver as the child receivers, and each child receiver has the control signal modulating means, the control signal demodulating device, and the control signal demodulating device. 9. The interactive television receiving system according to claim 8, further comprising a decoding unit, which can be controlled between the child receivers.

A transmission line according to a tenth aspect is the transmission line according to any one of the first to ninth aspects.
Used in any one of the two-way television receiving system, wherein a TV signal sent from the parent receiver is added to the parent receiver or the child receiver in a path connecting the parent receiver and the child receiver. A control signal demultiplexing means for multiplexing, transmitting and separating control signals from the machine is provided.

A tenth aspect of the present invention is that, in the tenth aspect, when the control signal from the slave receiver is multiplexed with the TV signal sent from the master receiver, the TV signal transmitted from the master receiver is The present invention is characterized by comprising a multiplexing means for selecting an empty channel and multiplexing the control signal.

According to a twelfth aspect of the present invention, in the tenth aspect, the TV signal sent from the parent receiver is multiplexed with the control signal from the child receiver, transmitted and separated, and the parent signal from the parent receiver. It is characterized in that it is provided with means for multiplexing and separating a control signal for controlling the slave receiver.

According to a thirteenth aspect, in the tenth aspect, a dedicated path for multiplexing and transmitting the control signal sent from the parent receiver and the control signal sent from the child receiver is provided, and the parent receiver and the child receiver are provided. It is characterized in that the receivers can communicate with each other.

The mixer of claim 14 is the mixer of claims 2 to 9.
Used in the two-way television receiving system of the above, when the program received and played back by the parent receiver is mixed with the signal to be delivered in order to be transmitted to the child receiver,
The present invention is characterized in that a detection / selection unit capable of detecting and selecting an empty channel of the V signal is provided.

[0031]

In the two-way television receiving system according to claim 1, means for controlling the parent receiver from the child receiver by providing a child receiver for the parent receiver connected to the cable television system, or parent receiving Since the means for controlling the child receiver from the device is provided, it is possible to control between the parent receiver and the child receiver.

A part of the functions can be shared between the parent receiver and the child receiver, and the circuit scale of the entire receiving system can be reduced.

When the slave receiver controls the master receiver, the slave receiver can select a program to be transmitted from the master receiver to the slave receiver, and the slave receiver can watch an arbitrary program. You can On the other hand, when the parent receiver is used to control the child receiver, the parent receiver can prevent the child receiver from watching a specific program and turn off the child receiver. .

According to the second aspect, since the received signal of the parent receiver is modulated and sent to the child receiver, even if the child receiver that can process and reproduce only analog TV programs is used, The digital TV program received by the parent receiver can be viewed by the child receiver.

According to claim 3, the slave receiver can control the selection of the analog or digital TV program in the master receiver, and the TV program selected by the master receiver in this way can be controlled by the slave receiver. You can watch it by playing at.

According to the fourth aspect, any one of the analog or digital TV programs selected by the parent receiver or a plurality of analog TV signals transmitted from the distributor can be selected and reproduced. . In addition, an efficient transmission band can be secured in the transmission band from the parent receiver to the child receiver.

According to the fifth aspect, the parent receiver and the child receiver can independently select programs. For example, when an analog TV program is being watched by the parent receiver, an arbitrary digital TV program can be selected. The child receiver can be selected and viewed.

According to the sixth aspect, in the slave receiver, an arbitrary program can be viewed from the plurality of digital TV programs demodulated by the master receiver.

According to the seventh aspect, among the plurality of child receivers, among the digital programs received by the common parent receiver, those arbitrarily selected by the plurality of child receivers can be reproduced. Further, a part of the functions can be shared between the parent receiver and the plurality of child receivers, and the circuit scale of the entire receiving system can be reduced.

According to the eighth aspect, the parent receiver can control the child receiver. This control
For example, it can be used to prevent a specific program from being played on the child receiver or to turn off the child receiver.

According to the ninth aspect, a plurality of slave receivers can be controlled by the common master receiver, and the slave receivers can be controlled by each other. Further, a part of the functions can be shared between the parent receiver and the plurality of child receivers, and the circuit scale of the entire receiving system can be reduced.

According to the transmission line of the tenth aspect, the transmission band can be effectively used.

According to the eleventh aspect, the transmission band can be set efficiently.

According to the twelfth aspect, the transmission band can be effectively used for mutual communication between the parent receiver and the child receiver.

According to the thirteenth aspect, a high-speed mutual communication path can be realized between the parent receiver and the child receiver.

According to the mixer of claim 14, efficient transmission can be carried out without interference such as interference and erroneous transmission.

[0047]

【Example】

Embodiment 1 FIG. 1 shows an interactive television receiving system according to an embodiment of the present invention. Reference numerals 1 to 11 are the same as those in the above-mentioned conventional example, and the same reference numerals are given and their description is omitted. . 30
Is an RF modulator, 31 is a transmission line connecting a parent receiver and a child receiver, 32 is an analog TV decoder that performs the same operation as the analog TV decoder 3, 33 is a control signal modulator, and 34 is a CPU of the child receiver. is there.

TV received and played back by the parent receiver
The signal is modulated by the RF modulator 30. This signal has, for example, a signal for one channel of a TV broadcast signal. This modulated signal is input to the transmission line 31.

In the slave receiver, the signal sent from the RF modulator 30 and transmitted through the transmission line 31 is converted into an analog T signal.
The V decoder 32 decodes and reproduces. At this time, since the signal from the parent receiver has one channel, the slave receiver does not need to select a band.

For example, a control signal is sent from the slave receiver to the master receiver in order to select a channel to be received by the master receiver. The control signal generated by the CPU 34 is the control signal modulator 33.
And is input to the transmission line 31.

The structure of the transmission line 31 will be described with reference to FIG. In the figure, 310 is a TV signal input terminal, 311 is a control signal output terminal, 312 is a control signal separating means, 313 is a control signal multiplexing means, 314.
Is a control signal input terminal, 315 is a TV signal output terminal, and 316 is a physical transmission line.

The input TV signal is directly transmitted through the physical transmission line 316 and output. The physical transmission line 316 at this time is configured by, for example, a coaxial cable, an optical fiber cable or the like.

The control signal input from the control signal input terminal 314 is multiplexed with the TV signal in the control signal multiplexing block 313. An example of this multiplexing is shown in FIG. In this example, the TV signal and the control signal are frequency-multiplexed.

The signal multiplexed by the control signal multiplexing block 313 is transmitted by the physical transmission path 316 described above. The control signal separating means 312 separates the multiplexed control signal by, for example, filtering and outputs the separated control signal from the control signal output terminal 311.

The control signal from the slave receiver output from the transmission line 31 is input to the control signal demodulator 9 and demodulated. The demodulated control signal from the child receiver is interpreted by the CPU 11, and the tuner 2, the switch 7 and the like are switched according to the request of the child receiver.

Embodiment 2 FIG. 4 is a diagram showing another embodiment of the present invention, in which the same numbers as in FIG. 1 perform the same operations. 12 is a mixer, and 35 is a tuner of a child receiver.

In this embodiment, the signal output from the RF modulator 30 is input to the mixer 12. In the mixer 12, the delivered signal and the RF modulator 3
The signal from 0 is multiplexed. This example will be described with reference to FIG.

In FIG. 5, the signal from the RF modulator 30 is converted into a channel having an analog TV channel. This channel may be a specific channel in the analog signal band or an arbitrary channel. The signal shown in FIG. 5 is transmitted to the child receiver through the transmission line 31. When the mixer 12 multiplexes the distributed signal and the signal modulated by the RF modulator 30, the mixer 12 selects an empty channel of the distributed signal and performs multiplexing.

In the slave receiver, this signal is input to the tuner 35. The tuner 35 selects the TV signal received by the parent receiver, reproduced and sent to the child receiver, and the analog TV signal transmitted from the program sender. The signal thus selected is decoded by the analog TV decoder.

Similar to the first embodiment, the slave receiver can control the master receiver, and can also play back the digital TV program through the master receiver.

Embodiment 3 FIG. 6 is a view showing another embodiment of the present invention, and FIGS.
The same numbers as are used for the same operations. In the figure, 13 is a tuner for selecting a digital TV signal band, and 14 is a switch for selecting a signal from the analog TV decoder 3 and the D / A converter 6. In the second embodiment, the tuner is 1
However, if the tuner 13 is provided, the signals of the selected bands can be input to the analog TV decoder and the digital TV decoder, and both programs can be reproduced at the same time.

The switch 14 has two output terminals, and signals output from each of them can be selected independently of each other. A signal used for reproduction in the parent receiver is output from one of the two output terminals (lower side in the drawing).
The other output terminal is connected to the RF modulator 30. For example, a digital TV program can be input to the RF modulator 30 while an analog TV program is being output for playback on the parent receiver.

Embodiment 4 FIG. 7 is a diagram showing another embodiment of the present invention.
The same numbers as are used for the same operations. Reference numeral 15 is a demultiplexer for extracting necessary data from the digital data string, 1
6 is a data modulator for modulating a digital signal, 36 is a data demodulator for demodulating a digital signal, and 41 is a transmission path. 8 is a diagram for explaining the configuration of the transmission line 41, in which the same numbers as those in FIG. 2 indicate the same operations, 410 is a modulation data input terminal, 411 is a multiplexing means, 412 is a separation means, and 413 is modulation data. It is an output terminal.

The demultiplexer 15 extracts necessary channel data from the digital data having a plurality of channels output from the digital demodulator. The extracted data is modulated by the data modulator 16 and transmitted to the transmission line 4
Input to 1.

The data modulated by the data modulator 16 is input from the modulation data input terminal 410, and the multiplexing means 4
At 11, it is multiplexed with the TV signal. An example of this multiplexing is shown in FIG. In the figure, the TV signal, digital data, and the control signal from the slave receiver are frequency-multiplexed.
A multiplexing method such as time axis multiplexing may be used.

Thereafter, the separation means 4 passes through the physical transmission line 316.
12 is input. In the separating means 412, the TV signal and the data signal are separated by, for example, filtering, and output from the output terminals 315 and 413 thereof. The separated data is demodulated by the data demodulation device 36 and reproduced as a TV program by the digital TV decoder. The CPU 34 switches the switch 7 in response to the request from the slave receiver to switch the output of the analog TV and the digital TV, so that the target program can be reproduced.

In the above embodiment, there is only one child receiver, but the parent receiver can be connected to a plurality of child receivers, and a single parent receiver can have a plurality of child receivers. A receiver may be connected. In this case, the parent receiver demodulates the plurality of digital TV signals to be distributed and selects the digital signals by selecting means (4, 15), and the modulation for modulating the selected signals for sending to the slave receiver. A plurality of means (16) respectively, and further transmitting means capable of transmitting the signals output from the plurality of modulating means (16) on a plurality of channels, and transmitting the channel information to the slave receiver as a control signal. And a control signal transmitting means that can be used.

Then, each of the plurality of receivers has a reproducing means (36) for separating, demodulating and reproducing the modulated digital signal transmitted from the parent receiver.

Embodiment 5 FIG. 10 is a diagram showing another embodiment of the present invention, in which the same numbers as in FIGS. 1 and 4 indicate the same operations. 37 is a control signal demodulator, and 51 is a transmission line. FIG. 11 is a diagram for explaining the configuration of the transmission line 51. Reference numeral 510 is a control signal input terminal, 512 is a control signal multiplexing / separating means, and 513 is a control signal output terminal.

In this example, the parent receiver sends a control signal to the child receiver. That is, the control signal to the slave receiver, which is generated by the CPU 11 of the master receiver, is modulated by the control signal modulator 8 and input to the transmission path 51. In the transmission path 51, the control signal multiplexing / separating means 512 multiplexes and separates the control signals from the parent receiver to the child receiver and from the child receiver to the parent receiver at both ends of the physical transmission path. FIG. 12 shows an example of multiplexing control signals and TV signals on the physical transmission line 316. In this example, the respective control signals and TV signals are frequency-multiplexed, but other multiplexing methods such as time-axis multiplexing may be used.

The control signal sent from the parent receiver to the child receiver is, for example, to act on the tuner of the child receiver so that a specific program cannot be selected or the power of the child receiver is turned off.

In the above embodiment, there is only one child receiver, but the parent receiver is configured to be connectable to a plurality of child receivers, and a single parent receiver has a plurality of child receivers. A receiver may be connected. In this case, each child receiver is configured to have the control signal modulating means (33) and the control signal demodulating and decoding means (37). Further, control may be made between the child receivers.

Embodiment 6 FIG. 13 shows another embodiment of the transmission line 31 used in FIGS. 1, 4 and 6, and the same numbers as those in FIG. 2 perform the same operations. Reference numeral 60 is a control signal transmission channel control device.

In this example, when the control signal is multiplexed, the control signal is not multiplexed on a fixed channel, but the transmission channel controller 60 multiplexes the area where the TV signal and the control signal are not transmitted. The configuration is such that the device 313 is controlled and multiplexed.

Embodiment 7 FIG. 14 shows another embodiment of the transmission line 31, in which the same numbers as in FIG. 2 perform the same operations. Reference numeral 70 is a dedicated path for transmitting a control signal, and 71 is a control device.

In this example, the control signal is transmitted by using a dedicated path, for example, a bus structure.
By controlling the bus with, a high-speed data communication path is constructed and a large amount of control signals are transmitted.

Embodiment 8 FIG. 15 shows an embodiment of the mixer 12 used in FIGS. 4, 6, 7 and 10, and 120 in FIG.
Is a distribution signal input terminal, 121 is a modulation signal input terminal, 1
22 is a multiplexing means, 123 is an empty channel detection selecting means, and 124 is a multiplexed signal output terminal.

In this example, the TV signal to be distributed is input from the distribution signal input terminal 120. The empty channel detection selection unit 123 detects an unused unused channel of the TV signal to be distributed, and controls the multiplexing unit 122 so that the signal input from the modulation signal input terminal 121 is multiplexed to the empty channel. To do. The signal input from the modulation signal input terminal 121 is a modulation signal (output of the RF modulator) received and reproduced by the parent receiver and transmitted to the child receiver, and the signal multiplexed by the multiplexing unit 122 is Is a multiplexed signal of the TV signal to be distributed and the TV signal to be transmitted to the child receiver, and this signal is output from the multiplexed signal output terminal 124.

[0079]

In the interactive television receiving system according to the first aspect of the present invention, means for providing a child receiver to the parent receiver connected to the cable television system and controlling the parent receiver from the child receiver, or Since the means for controlling the slave receiver from the master receiver is provided, control can be performed between the master receiver and the slave receiver. Part of the function can be shared between the parent receiver and child receiver,
The circuit scale of the entire receiving system can be reduced.

When the parent receiver is controlled by the child receiver, the child receiver can select the program to be transmitted from the parent receiver, and the child receiver can watch any program. You can On the other hand, when the parent receiver is used to control the child receiver, the parent receiver can prevent the child receiver from watching a specific program and turn off the child receiver. .

According to the second aspect, since the received signal of the parent receiver is modulated and sent to the child receiver, even if the child receiver that can process and reproduce only analog TV programs is used, The digital TV program received by the parent receiver can be viewed by the child receiver.

According to the present invention, the slave receiver can control the selection of the analog or digital TV program in the master receiver, and thus the TV program selected by the master receiver can be controlled by the slave receiver. You can watch it by playing at.

According to the present invention, any one of the analog or digital TV programs selected by the parent receiver or a plurality of analog TV signals transmitted from the distributor can be selected and reproduced. . In addition, an efficient transmission band can be secured in the transmission band from the parent receiver to the child receiver.

According to the fifth aspect, the parent receiver and the child receiver can independently select programs. For example, when an analog TV program is being watched by the parent receiver, an arbitrary digital TV program can be selected. The child receiver can be selected and viewed.

According to the sixth aspect, in the child receiver, an arbitrary program can be viewed from the plurality of digital TV programs demodulated by the parent receiver.

According to the seventh aspect, among the plurality of child receivers, among the digital programs received by the common parent receiver, those arbitrarily selected by the plurality of child receivers can be reproduced. Further, a part of the functions can be shared between the parent receiver and the plurality of child receivers, and the circuit scale of the entire receiving system can be reduced.

According to the eighth aspect, the parent receiver can control the child receiver. This control
For example, it can be used to prevent a specific program from being played on the child receiver or to turn off the child receiver.

According to the ninth aspect, a plurality of child receivers can be controlled by the common parent receiver, and the child receivers can be controlled mutually. Further, a part of the functions can be shared between the parent receiver and the plurality of child receivers, and the circuit scale of the entire receiving system can be reduced.

According to the transmission line of the tenth aspect, the transmission band can be effectively used.

According to the eleventh aspect, an efficient transmission band can be set.

According to the twelfth aspect, the transmission band can be effectively used for mutual communication between the parent receiver and the child receiver.

According to the thirteenth aspect, a high-speed mutual communication path can be realized between the parent receiver and the child receiver.

According to the mixer of claim 14, efficient transmission can be carried out without interference such as interference and erroneous transmission.

[Brief description of drawings]

FIG. 1 is a block diagram showing a cable television receiving system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a transmission line used in the first embodiment.

FIG. 3 is a diagram showing a method of band division of a multiplexed signal in the transmission line of the first embodiment.

FIG. 4 is a block diagram showing a cable television receiving system according to a second embodiment.

FIG. 5 is a diagram showing a method of band division of a multiplexed signal in a transmission line of a second embodiment.

FIG. 6 is a block diagram showing a cable television receiving system according to a third embodiment.

FIG. 7 is a block diagram showing a cable television receiving system according to a fourth embodiment.

FIG. 8 is a schematic diagram showing a configuration of a transmission line used in a fourth embodiment.

FIG. 9 is a diagram illustrating a method of band division of a multiplexed signal in a transmission line of a fourth embodiment.

FIG. 10 is a block diagram showing a cable television receiving system according to a fifth embodiment.

FIG. 11 is a schematic diagram showing a configuration of a transmission line used in the fifth embodiment.

FIG. 12 is a diagram showing a method of band division of a multiplexed signal in the transmission line of the fifth embodiment.

FIG. 13 is a schematic diagram showing a transmission line according to the sixth embodiment.

FIG. 14 is a schematic diagram showing a transmission line according to a seventh embodiment.

FIG. 15 is a block diagram showing a mixer according to an eighth embodiment.

FIG. 16 is a block diagram showing a conventional cable television receiving system.

FIG. 17 is a diagram showing a method of band division of multiplex signals in a conventional cable television receiving system.

[Explanation of symbols]

1 input terminal, 2 tuner, 3 analog TV decoder, 4 digital demodulator, 5 digital TV decoder,
6 D / A converter, 7 switch, 8 control signal converter, 9 control signal demodulator, 10 multiplex means, 11 CPU, 12 mixer, 13 tuner, 1
4 switches, 15 demultiplexer, 30 RF modulator, 31, 41 transmission line, 32 analog TV
Decoder, 33 Control signal modulator, 34 CP
U, 35 tuner, 36 data demodulation means, 60 transmission channel control means, 70 physical transmission line, 71 bus control circuit, 120 distribution signal input terminal, 121 modulation signal input terminal, 122 multiplexing means, 123 empty channel detection selection means, 124 Multiplex signal output terminal, 310
TV signal input terminal, 311 control signal output terminal, 312 control signal separating means, 313 control signal multiplexing means, 314 control signal input terminal, 315 TV signal output terminal, 410 data modulation input terminal, 411 data multiplexing means, 412 data separating means 413 data modulation signal output terminal, 510 control signal input terminal, 512 control signal multiplex / minute

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichiro Nishiyama 1 Baba-Zou, Nagaokakyo-shi, Kyoto Mitsubishi Electric Corporation

Claims (14)

[Claims] 1. A delivery side connectable to a route for transmitting a plurality of analog TV signals and a digital TV signal, and a delivery side for sending out a program by each receiver and a receiver side are connected,
In a two-way receiving system that can be connected to a system that allows each receiver to select an arbitrary program, a parent receiver connected to the distribution side, a child receiver, the parent receiver and the child receiver are connected. And a means for transmitting the program received and reproduced by the parent receiver to the child receiver through the path, and the child receiver is the parent receiver. Control means for controlling the parent receiver, which is provided in the child receiver and has control means for controlling the child receiver, which has means for receiving and reproducing the program transmitted from An interactive television receiving system comprising at least one of the means. 2. The transmitting means of the parent receiver modulates a received signal of the parent receiver and transmits the modulated signal to the child receiver, and the receiving / reproducing means of the child receiver comprises: 2. The two-way television receiving system according to claim 1, wherein the two-way television receiving system is for reproducing after demodulating a signal modulated and sent from the parent receiver. 3. A control means provided in the slave receiver is used as the control means, and the control means generates a control signal for selecting a program sent from the master receiver, The interactive television receiving system according to claim 1 or 2, wherein the interactive television receiving system is for transmitting to the parent receiver. 4. The parent receiver includes means for multiplexing a received signal of the parent receiver, a signal modulated for transmission to the child receiver, and a delivered signal, wherein the child receiver is the 4. The interactive television receiving system according to any one of claims 1 to 3, further comprising means for selecting any one of the multiplexed signals. 5. The parent receiver selects a first analog signal from a plurality of distributed analog TV signals of a plurality of channels, and a digital signal from a plurality of distributed digital TV signals of a plurality of channels. The second selection means for selecting and the two signals selected by the first and second selection means and receive the two signals, and independently of either of the two signals from the first and second output terminals. The output obtained from the first output terminal is used as an output for reproduction in the parent receiver, and the output obtained from the second output terminal is used for the transmission. The interactive television receiving system according to any one of claims 1 to 4, wherein the interactive television receiving system is transmitted to the slave receiver by means. 6. The parent receiver demodulates a plurality of channels of digital TV signals to be distributed, and selects a channel selecting means, and a signal modulating means for modulating the selected signal for sending to the slave receiver. 6. The slave receiver further comprises reproduction means for separating, demodulating and reproducing the modulated digital signal transmitted from the master receiver. Interactive television receiving system. 7. The parent receiver demodulates a plurality of digital TV signals to be distributed and selects with digital signals, and a modulator that modulates the selected signals for sending to the slave receiver. The parent receiver further comprises a sending means capable of sending the signal output from the modulating means in a plurality of channels, and a control signal sending means capable of sending the channel information as a control signal to the slave receiver. A plurality of receivers are provided as the child receivers, and each of the plurality of receivers has a reproducing means for separating, demodulating and reproducing the modulated digital signal transmitted from the parent receiver. The interactive television receiving system according to claim 6, characterized in that 8. The parent receiver comprises control signal generating means for controlling the child receiver, and signal sending means for modulating the generated control signal and sending the modulated control signal to the child receiver. 8. The interactive television receiving system according to claim 1, wherein the receiver has a decoding means for receiving a control signal from the parent receiver and decoding the received control signal. 9. A plurality of slave receivers are connected to the master receiver as the slave receivers, and each slave receiver has the control signal modulating means, the control signal demodulating and decoding means, and the slave receivers. The interactive television receiving system according to claim 8, wherein control is possible between the receivers. 10. A TV signal sent from the parent receiver is multiplexed with a control signal from the parent receiver or the child receiver and transmitted on a path connecting the parent receiver and the child receiver. The transmission line in the interactive television receiving system according to any one of claims 1 to 9, further comprising a control signal demultiplexing means for separating. 11. When the control signal from the slave receiver is multiplexed with the TV signal sent from the master receiver, an empty channel of the TV signal transmitted from the master receiver is selected and a control signal is transmitted. The transmission line in the interactive television transmission system according to claim 10, further comprising a multiplexing unit for multiplexing. 12. A means for multiplexing and transmitting a control signal from the slave receiver to a TV signal sent from the master receiver and separating the control signal, and a control for controlling the slave receiver from the master receiver. The transmission line in the interactive television receiving system according to claim 10, further comprising means for multiplexing and separating signals. 13. A dedicated path for multiplexing and transmitting a control signal sent from the parent receiver and a control signal sent from the child receiver is provided, and the parent receiver and the child receiver can communicate with each other. A transmission line in the interactive television transmission system according to claim 10, which is possible. 14. A detection selection capable of detecting and selecting an empty channel of a TV signal to be distributed when mixing a program received and reproduced by the parent receiver with a signal to be distributed to be transmitted to the child receiver. Mixer for an interactive television reception system according to any of claims 2 to 9, characterized in that it comprises means.