JPH0520010B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cable broadcasting service system, and particularly to a cable broadcasting service system that utilizes the idle time of subscriber lines to perform the basic functions of telephone communication, such as outgoing calls, incoming calls, and telephone calls. Information that is highly needed by subscribers without any hindrance,
The present invention relates to a wired broadcasting service system that is provided to subscribers from a broadcasting center via a subcenter installed in a telephone office.

[Conventional technology]

Traditionally, services using telephone lines include:
There are weather forecasts, time signals, various telephone information services, etc., all of which use telephone exchanges and occupy lines.

On the other hand, cable broadcasting services are becoming more popular, but because the current system uses a dedicated line, it does not directly affect the basic functions of telephones.

[Problem that the invention seeks to solve]

As mentioned above, current cable broadcasting services are completely unrelated to telephone services and require a separate dedicated line, resulting in high installation costs.
In addition, if a dedicated line is installed over an overhead line, there are problems from the aesthetic point of view of the city.

In addition, services using traditional telephone lines,
When using this, a telephone line is used, so there is a problem that it becomes impossible to respond to incoming calls from third parties.

The present invention has been made in view of the above circumstances, and its purpose is to provide a new service that combines the two services described above, that is, to provide information services such as outgoing, incoming, and phone calls, which are normally used to receive information services. When using the telephone function, the above information service can be automatically switched to the telephone function,
Our objective is to provide a new cable broadcasting service system.

[Means for solving problems]

In order to achieve the above object, the wired broadcasting service system of the present invention provides (a) a system that uses telephone lines to provide services other than telephone, in which a telephone and a plurality of information services sent by wired broadcasting can be enjoyed; a first switching means for switching between the telephone function and the wired broadcast receiving function; a voltage change at the end of the telephone is constantly monitored; when the telephone is off-hook, a voltage change is detected; and the first switching means is actuated. A telephone subscriber's home device having an off-hook detection section and an incoming call detection section that detects an incoming call signal arriving from a communication line and actuates a first switching means to the telephone side, and is connected to the home device via the communication line. a second switching means that switches between the telephone function and the wired broadcast relay function in response to a request from the home equipment or the exchange; and off-hook detection that detects a voltage change from the home equipment and activates the second switching means. The present invention is characterized in that it is comprised of a wire broadcasting relay center having an incoming call detection section that detects an incoming call signal from the exchange and activates the second switching means to the telephone side. In addition, (b) a telephone, a receiving means for enjoying multiple information services sent by wired broadcasting, a first switching means for switching between the telephone function and the wired broadcasting receiving function, and a voltage at the end of the telephone that is constantly monitored. an off-hook detection section that detects a voltage change when the telephone is off-hook and activates the first switching means; and an incoming call that detects an incoming call signal coming from a communication line and activates the first switching means to the telephone side. A telephone comprising a detection unit, a switching means for switching between a plurality of information services, and an information service selection signal sending means for coding a plurality of pieces of information, pulse-modulating the coded control signal, and sending the coded control signal to a communication line. a second switching means that is connected to the subscriber's home device via a communication line and switches between a telephone function and a wired broadcast relay function in response to a request from the home device or the exchange; an off-hook detection section that detects a voltage change in the telephone and activates a second switching means; an incoming call detection section that detects an incoming call signal from the exchange and activates a second switching means to the telephone; It has a receiving means for an information service selection signal sent from the device, a signal decoding means for code-converting and decoding the received signal obtained by the receiving means, and a means for transmitting a signal corresponding to the decoded information service. Another feature is that it consists of a broadcasting service center.

[Effect]

The cable broadcasting service system according to the present invention includes:
Normally (when the telephone function is not used), the setting is to listen to the wired broadcast corresponding to the information service selected by the user, but if the user makes a call or receives a call from outside, By automatically switching the wired broadcast listening function to the original telephone function, the subscriber line can be switched automatically, without affecting the telephone's outgoing, incoming, or telephone calls, even while enjoying information services. This aims to make effective use of free time.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an overview of a cable broadcasting service system which is an embodiment of the present invention. In the figure, 1 is a telephone, 2 is a cable broadcast (hereinafter referred to as
speakers for receiving broadcasts (referred to as "broadcasts"), 3
is a telephone and broadcast switching device installed inside the house. The switching device 3 has a power source, and by turning it on, it is normally set to the side that receives the broadcast (hereinafter referred to as the "broadcasting side").

Further, reference numeral 4 denotes a telephone/broadcast switching device provided on the side of the sub-center 9 installed in the telephone office, and is normally set to the above-mentioned "broadcasting side" when the power is on. A relay amplifier 5 has a function of amplifying the signal sent from the broadcasting center 8.

6 is an exchange, and 7 is a trunk line connecting the sub-center 9 and a broadcasting center 8, which will be described later. Broadcasting center 8 has broadcasting equipment and will transmit various information from now on.
For example, 20 channels are always provided to a plurality of subcenters 9.

FIG. 2 is a diagram showing the configuration of the switching device 3 on the residential side and the switching device 4 on the subcenter side.
In the figure, 31 and 41 are OFF hook detection circuits that monitor the ON/OFF hook of the telephone; 32 and 4
2 is an incoming call detection circuit that detects an incoming signal (16Hz, 75V), 33 is a channel switching circuit inside the house for switching information channels, 43 is a channel switching circuit on the subcenter side, 34 is a changeover switch,
44 is a communication line, and 10 is a channel display device.

Figure 3 shows the OFF hook detection circuit 3 inside the house.
1 and an incoming call detection circuit 32. FIG. In addition, the subcenter side
OFF hook detection circuit 41 and incoming call detection circuit 42
is also configured in the same way. Hereinafter, the symbols will be described in parentheses.

The OFF hook detection circuits 31 and 41 on the home (subcenter) side include diode bridges 31A and 41A for adjusting the polarity of the current from the line,
Comparator circuits 31B and 41B that perform voltage detection
and one-shot multi-circuit 31C, which will be described later.
41C, an incoming call detection circuit 32,
42 are diode bridges 32A, 42A that rectify the incoming signal, and relays K ₁ , K ₂ , 32 that operate upon OFF hook detection or incoming call detection.
B, 42B.

The operation of this embodiment will be described below with reference to FIGS. 1 to 3.

First, the normal state (when the telephone function is not used) will be explained.

Turn on the power of switching device 3 installed inside the house
Then, the relay 32B operates and its contact is switched to the "broadcasting side". The switching device 4 provided on the sub-center side usually has the following functions as described above.
Since it is set to the "broadcasting side", information sent from the broadcasting center 8 enters the home via the connection line 7, relay amplifier 5, and switching device 4, and drives the speaker 2 through the switching device 3. do.

As mentioned above, this system has an in-house channel switching circuit 33 for switching information channels inside the house, and the user operates the manual switch of this channel switching circuit 33 to
You can listen to your favorite information services. The channel selection will be described in detail later.

Next, the calling operation will be explained.

The above connected to L ₁ and L ₂ ends of telephone 1
The OFF hook detection circuit 31 is connected to an internal relay 32.
A voltage of 24 V is supplied from contacts 3 and 4 of B, and the voltage at the L ₁ and L ₂ terminals is constantly monitored using the voltage rectified by the diode bridge 31A.

When off-hook is performed, current flows through the communication circuit inside the telephone 1, so the external supply voltage of 24V is
Changes to 12V. This change is transmitted to the comparator circuit 31 via the diode bridge 31A.
B, where off-hook detection is performed.
This off-hook detection signal is transmitted to the incoming call detection circuit 32.
is input to relay 32B, which causes relay 3
2B operates and switches the contacts of the relay 32B, which is provided between the OFF hook detection circuit 31 and the incoming call detection circuit 32, to the 5 and 6 sides.

Similarly, the relay 42B in the incoming call detection circuit 42 is operated by the OFF hook detection circuit 41 of the switching device 3 installed on the sub-center side,
Switch the relay contacts to the 5th and 6th sides.

According to the above sequence of operations, the telephone exchange 6 can be connected by simply taking off the telephone 1. After that, all you have to do is listen to the dial tone (DT) from the exchange 6 and dial. When the other party answers, a voltage change is detected by the OFF hook detection circuit 41 on the subcenter side, and the line is held. A detailed explanation of this operation will be given in the explanation of the incoming call operation described later.

Note that the one-shot multi-circuit 31C in the OFF hook detection circuit 31 is for guaranteeing the transmission time of the rotary dial pulse, and is unnecessary in the case of push button dial transmission.

When the call ends, the comparator 31B inside the house detects this by on-hooking.
This signal is input to the relay 32B, and the relay contacts are switched to the 1 and 2 sides. Similarly, subcenter 9
The OFF hook detection circuit 41 on the side operates and switches to the "broadcasting side".

Next, the incoming call operation will be explained.

First, the incoming call signal flows through the exchange 6 to the incoming call detection circuit 42 on the sub-center side, which is connected to the office lines L ₁ and L ₂ via a DC blocking capacitor. As mentioned above, the incoming call detection circuit 42 has the same configuration as the incoming call detection circuit 32 inside the house, and in the following explanation, the symbol numbers shown in the explanation of FIG. 3 will be used. explain.

The incoming signal is rectified by diode bridge 42A, and this voltage is input to relay 42B. This causes the relay 42B to operate, connecting the relay contacts to 5,
Switch to side 6. In the same way, the incoming call detection circuit 32 inside the house operates and connects the contacts of the relay 32B to 5,
Switch to side 6. As a result, the incoming signal is
reaches the incoming circuit and rings the bell.

In this state, the station power supply voltage is 48V at the ends of the station wires _L1 and _L2 .
is applied. Here, when the telephone 1 is off-hook, the voltage of 48V drops to about 12V, so in the off-hook detection circuit 31 inside the house, the comparator circuit 31B regards this as an off-hook and operates the relay 32B, closing the relay contact to 5. , held on the 6 side.

In this case, since the incoming signal disappears due to the off-hook operation, the incoming call detection circuit 32 tries to restore the relay 32B, but at the same time
Since the OFF hook detection circuit is activated, the relay 32B is activated and held on the telephone line side.

The operation in the case of ending the call is the same as the above-mentioned calling operation, so the explanation will be omitted.

FIG. 4 shows a detailed configuration of the channel switching circuit 33 (see FIG. 2) provided inside the house. In the figure, 33A is an oscillator that generates a clock, 33B is a manual switch for channel selection, 33C is a control counter that sets the switching time for channel selection, and 33D is a waveform shaping circuit for the signal from the channel selection switch 33B. , 33E indicates a control logic circuit, 33F an AND circuit, 33G a selection value counter, 33H a parallel/serial conversion circuit, 33J an oscillator for pulse modulation,
33K indicates an inverter circuit.

Further, 34 is a changeover switch for selecting a channel, which is manually operated.

The operation when the "UP" button of the manual switch 33B is pressed to select a channel will be described below.

First, the changeover switch 34 is switched to the channel selection side.

By pressing the "UP" button, the signal pulled up by the waveform shaping circuit 33D and at H level changes to L level. In the waveform shaping circuit 33D,
The above signal is waveform-shaped to prevent chattering, and passed through the inverter circuit again to the H level.
Input to AND circuit 33F.

On the other hand, the oscillator 33A, the control counter 33C
From there, a pulse for setting the channel selection switching time is input to the AND circuit 33F. In the AND circuit 33F, the above two inputs cause the above "UP"
As long as the button continues to be pressed, the control counter 33
It is counted up at the interval from C. The above-mentioned count number can be monitored by the channel display 10, and it is only necessary to release the hand when the desired channel is reached.

The output of the AND circuit 33F is input to a selection value counter 33G. Assuming that the required number of channels is 20 as mentioned above, this output is 8 bits (divided into 4 bits for each digit), and is converted into serial data by the parallel/serial conversion circuit 33H. do.

In addition, the control logic circuit 33E includes
The clock signal from the control counter 33C and the channel selection signal data from the waveform shaping circuit 33D are input to the parallel/serial conversion circuit 33H as outputs, and the Load signal and TX SHIFT CLOCK are sent as the parallel/serial conversion clock.
Input the signal. Immediately after releasing the "UP" button, a Load signal is input.

As a result, the TX SHIFT CLOCK signal is connected bit by bit as serial data, inputted to the oscillator 33J, pulse-modulated, and sent to the inverter 33K, and this signal is transmitted to the L ₁ ,
Sent to L ₂ .

Note that the parallel/serial conversion circuit 33H
The other 8-bit data inputted to the channel selection signal data is data used for checking the channel selection signal data after transmission.

FIG. 5 is a diagram showing a detailed configuration of the channel switching circuit 43 provided on the sub-center side.
In the figure, 43A is an oscillator that creates a clock for serial/parallel conversion, and 43B
43C is a control counter, and 43C is a signal receiving unit that receives a channel selection signal (serial data) sent from inside the house through the ends of the office lines _L1 and _L2 , and is composed of a capacitor, a diode bridge, a photocoupler, etc.; This is for synchronizing serial/parallel conversion.

Further, 43D is a clearing processing circuit, which cancels the clearing of the control counter 43C when data arrives;
The counter starts operating from the moment the data arrives. When no data is received, the counter is in a clear state and does not operate. 43E is a serial/parallel converter, 43F is a latch circuit, 43G is a data detection/confirmation circuit, 43H is a differentiation circuit, and 43J is a decoder circuit, each having the function of decoding 8-bit data into 20 bits each. be. 43K is an analog switch, 43L is an amplifier, 43M is 1~
Shows information sources for 20 channels.

The operation of this circuit will be explained below.

The channel selection signal sent from the L ₁ and L ₂ ends on the inside of the house passes through the signal receiving section 43B and is input to the clear processing circuit 43D and the serial/parallel conversion circuit 43E. Clear processing circuit 43D
As mentioned above, when data comes, control counter 4
3C is cleared and the counter starts operating from there. At the same time, the output of the photocoupler in the signal receiving section 43B is output from the serial/parallel conversion circuit 43E.
is input. Here, the serial data is converted into 8-bit parallel data (4 bits, 4 bits), and this data is input to the latch circuit 43F.

On the other hand, the remaining 8 bits of output from the serial/parallel conversion circuit 43E (the above-mentioned check data)
is data detection confirmation circuit (comparator) 43G
When an equal signal indicating that the data match is output, this signal is differentiated and input to the clock of the latch circuit 43F. Data is latched when all 16-bit signals are completed.
Here, the selection data for the inside of the house is reproduced.

Note that since the differentiating circuit 43H has a wide range of data, it is difficult to input a clock as it is. Therefore, the rising edge of the pulse is differentiated and converted into a thin pulse, which is then input into the Rachitsu clock. The output of the latch circuit 43F is sent to the decoder 43J.
Accordingly, one of the 20 channels is selected.

This signal is input to the analog switch 43K, while channels 1 to 20 of the information source 43M are input to the analog switch 43K and connected to the selected channel. This signal is sent to the inside of the house from the L ₁ and L ₂ terminals through the amplifier 43L.

Finally, the changeover switch 34 installed inside the house
If you return it to the speaker side, you will hear the information of the selected channel.

Above, we have explained the operation when the "UP" button of the channel selection switch 33B is pressed to select a channel, but the same operation sequence can be performed when the "DOWN" button is pressed. . In this case, the count will be decremented only while the "DOWN" button is pressed.

〔Effect of the invention〕

As described above, according to the cable broadcasting service system of the present invention, normally (when the telephone function is not used)
is set to listen to the cable broadcast corresponding to the information service selected by the user, but when there is a call made by the user or an incoming call from outside, the above cable broadcast listening function is automatically activated. Switching to the original telephone function, even while enjoying the additional information service, there is no effect on the telephone's outgoing, incoming, or voice calls, and the subscriber line is free. This has the remarkable effect of making it possible to make effective use of time slots.

Further, the cable broadcasting service system of the present invention has great advantages such as not affecting communication or switching equipment operation even in the event of a power outage. Furthermore, according to the cable broadcasting service system of the present invention, there is no influence on incoming facsimile calls and incoming calls.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of a cable broadcasting service system that is an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of switching devices on the inside of the premises and the subcenter side, and FIG. FIG. 4 is a diagram showing the detailed configuration of the hook detection circuit 31 and the incoming call detection circuit 32, FIG. 4 is a diagram showing the detailed configuration of the channel switching circuit (see FIG. 2) provided inside the house, and FIG. 5 is a diagram showing the detailed configuration of the sub-center FIG. 4 is a diagram showing a detailed configuration of the channel switching circuit 43 provided on the side. 1: Telephone, 2: Speaker, 3: In-house switching device, 4: Sub-center switching device, 5: Relay amplifier, 6: Exchange, 7: Relay line, 8: Broadcasting center, 9: Sub-center, 10: Channel display ,3
1, 41: OFF hook detection circuit, 32, 42:
Incoming call detection circuit, 33: In-home channel switching circuit, 43: Sub-center side channel switching circuit, 3
4: Changeover switch.

Claims (1)

[Scope of Claims] 1. A system that provides services other than telephone calls using a telephone line, including a telephone set, a receiving means for receiving a plurality of information services sent by wired broadcasting, a telephone function and the wired broadcasting. a first switching means for switching the receiving function; an off-hook detection unit that constantly monitors the voltage at the end of the telephone, detects the voltage change when the telephone is off-hook, and activates the first switching means; and a communication line. an in-home device of a telephone subscriber, the device being connected to the in-home device via a communication line, and having an incoming call detection section that detects an incoming call signal arriving from the telephone and actuating the first switching means to the telephone side; a second switching means that switches between a telephone function and a cable broadcast relay function in response to a request from the device or exchange; and an off-hook detection section that detects a voltage change from the in-home device and activates the second switching means. and an incoming call detection section that detects an incoming signal from an exchange and activates the second switching means to the telephone side. 2. In a system that uses telephone lines to provide services other than telephone calls, a telephone set, a receiving means for enjoying multiple information services sent by wired broadcasting, and a device for switching between the telephone function and the wired broadcasting receiving function. an off-hook detection section that constantly monitors the voltage at the end of the telephone, detects the voltage change when the telephone is off-hook, and activates the first switching means; an incoming call detection unit that detects a call and activates the first switching unit on the telephone side; a switching unit that switches between the plurality of information services;
an information service selection signal sending means for coding the plurality of pieces of information, pulse-modulating the coded control signal, and sending the coded control signal to the communication line; a second switching means that is connected to the home device and switches between a telephone function and a wired broadcast relay function in response to a request from the home device or the exchange; a second switching device that detects a voltage change from the home device; an off-hook detection section that activates a switching means; an incoming call detection section that detects an incoming call signal from an exchange and activates the second switching means toward the telephone; and an information service selection sent from the in-home device through a communication line. The cable broadcast relay center comprises a signal receiving means, a signal decoding means for code-converting and decoding the received signal obtained by the receiving means, and a signal transmitting means corresponding to the decoded information service. A cable broadcasting service system characterized by: