JPS5894258A - Call controller - Google Patents

Abstract

PURPOSE:To reduce a malfunction, and also to quicken an answering property by a simple constitution, by using a frequency shift keying signal, as a call control signal, and locking a call when sending out a control signal. CONSTITUTION:From an FSK signal transmitter 6 for controlling a call of a master side, an FSK signal is transmitted in accordance with a signal corresponding to an input of transmitting, receiving, clearing, etc. In this case, by a call-control signal sending-out changeover switch 8, a transmitting voice is locked, and only a control signal of a slave side is received through a transmitting circuit 5. By locking said voice, it is prevented that the voice is superposed on the FSK signal, and S/N is raised. Also, by an FSK signal receiver 7 of the slave side, the FSK signal is received and demodulated, and a transmitting and receiving switching type call device 3 of the slave side is controlled. In this way, a malfunction is reduced, also an answering property is quickened, and constitution of a call controller is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call control device that controls calls on a slave side using a call line.

Conventionally, this type of device uses tJ F (multi frequency) in the control signal as shown in FIG.
There was a device that used signals. In Figure 1, (1) is the MF transmitter installed at the observation station, (2) is the MF receiver installed at the slave station, and (3) is the communication device installed at the observation and slave stations respectively. , (4) is a hybrid transformer, (
5) is the communication line between the two stations.

Next, the operation will be explained. The call is observed, the slave side sends a call,
This is done by a receiver switching type communication device (3), a hybrid transformer (4) on the observation/slave side, and a communication line (5). When trying to control the sending, receiving, and ending of calls on the slave side from observation, a specific signal is sent from the MF transmitter 11) to the M Blitz V transformer (4) and connected to the call line +51C.
The slave side extracts and decodes the MF multiplied signal by the MF receiver (2), and controls the slave side communication device (31).

A conventional call control device is configured as described above.

Moreover, the MF multiplied signal is used as the control signal.

There is a malfunction of the MF receiver (2) due to audio, and the MF
A highly accurate reception filter is also required for the receiver (2).7
Response speed is also slow. There are not many combinations of MF multiplier signal frequencies, and the number of items that can be controlled is also limited.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and instead of using an MF multiplied signal as a single call control signal, FSK (Frequency
It is an object of the present invention to provide a call control device that is less likely to malfunction, has a fast response speed, and has a simple configuration by using a ft Keying signal and locking a call when sending a control signal.

An embodiment of the present invention will be described below with reference to FIG. In FIG.
4) is the Hybrid F transformer, (5) is the telephone line, (
6) is a signal transmitter at F8 for sending a call control signal (FSK signal) provided in the tax system, and (7) is an F8 installed on the slave side.
The BK signal receiver (8) is a relay serving as a changeover switch that has a function of cutting off the call voice when sending a control signal.

In the above configuration, the FSK signal transmitter (6) for tax system call control transmits an FSK signal corresponding to a code corresponding to an input such as sending, receiving, or ending a call. At this time, the switching relay (
81, the outgoing voice is locked.

This prevents audio from being superimposed on the FSK signal.
The slave side can receive only the control signal and has a high 8N ratio. On the slave side, the signal receiver (7) receives the signal at F'8, decodes it, and controls the telephone communication device (3) on the slave side.

It should be noted that the malfunction rate of the FSK signal receiver (7) when receiving audio can be sufficiently reduced by the method of configuring the code according to the control item. Also, in the conventional technology, it is possible to reduce the malfunction rate by combining MF multiplied signals in time series, but the modulation speed of the F'SK method (for example, 200 baud) is more than five times that of the MF method. The FSK method can reduce the malfunction rate within the same period of time.

In the above embodiment, commands such as switching between sending and receiving calls, and ending calls are given to the slave side using FSK signals, but the same effect can be obtained even if the object to be controlled is not a communication device. Further, a semiconductor switch may be used instead of a relay as a changeover switch between tax-based telephone calls and control signal transmission.

As described above, according to the present invention, the FS, which is the 4th episode control signal,
Since the K signal is used and the call is locked when it is sent, the malfunction rate is low, the response speed is fast, and a highly accurate receiving filter is not required, so the device can be made at low cost and the number of control items can be easily increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a communication device with a conventional communication control device;
FIG. 2 is a schematic diagram of a communication device having a communication control device according to an embodiment of the present invention≦2. In the figure, (31 is a transmitting/receiving switching type communication device. (4) is a hybrid transformer, (6) is an FSK signal transmitter, (7) is a signal receiver at F8, and (8) is a communication/control signal. This is a transmission selector switch. Note that the same line numbers in Figure 1 indicate the same or corresponding parts f. Agent Makoto Sabarino - Figure 1 Figure 2

Claims (1)

[Claims] In the 1-talk control device that controls the call from the observation side to the slave side using the call disconnection line, a Fi'SK signal generator that is installed in the observation and generates a CFSK signal with a call charge of A1D;
A call control device comprising: an F'SK signal receiver provided on a slave side for receiving the FSK signal; and a changeover switch for cutting off call audio when the FSK signal transmitter generates a call control signal.