JPS60214124A - Signal transmitter - Google Patents

Abstract

PURPOSE:To suppress an unnecessary carrier signal and also to transmit a voice signal without interruption by outputting the carrier signal when the voice signal is outputted and no control signal is outputted. CONSTITUTION:When the control signal is outputted from a microcomputer 5, and when talking is started by depressing a talking switch 8, an output of a voice detection circuit 10 goes to H. The voice signal is superimposed on a modulation signal and the result is transmitted. When the microcomputer 5 completes the talking processing, a processing end signal goes to H and an output of a gate circuit 20 goes to H. Then a carrier signal is outputted from the gate circuit 21 and the voice signal is superimposed on the output of the gate circuit 21 and the result is transmitted. When the voice signal is lost while the processing end signal is at H level, the carrier signal from the gate circuit 21 is not outputted. As a result, the unnecessary signal is suppressed and the voice signal is transmitted without interruption.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is capable of remotely controlling household appliances such as instantaneous water heaters and household boilers from multiple rooms using a remote control device, and also enables telephone calls between multiple rooms. This invention relates to a signal transmission device that makes it possible.

Conventional configurations and their problems Usually, outdoor equipment is equipped with a transmitting/receiving device, and the remote control device is installed in a place far away from the equipment, such as in the kitchen, living room, bath, or washroom.

For example, a user in the bathroom may wish to interact with another person in the kitchen or living room, or a person indoors and a person outdoors may wish to interact.

An example of a conventional signal transmission device is shown in FIG. 1 is a transmitting/receiving device on the equipment side, 2a and 2b are remote control devices that transfer operation switch signals and temperature setting signals to the transmitting/receiving device 1, and 3
is a transmission line, 4a is a device side, and 4b and 4c are intercom devices attached to remote control devices 2a and 2b.

When a certain user wishes to communicate to a user at another location, a voice signal is outputted to the transmission line 3 from the intercom devices 4a, 4b, 4c. transmitting/receiving device 7 and remote control,
Control signals (switch signals, display signals, etc.) are communicated between the devices 2a and 2b, and the intercom device 4a
, 4b, and 4c are superimposed and transmitted. However, the transmitting/receiving device 1 and the remote control device 2a,
Communication with 2b is performed intermittently and there are no signal zones. On the other hand, since the voice signals output from the intercom devices 4a, 4b, 4c are generated irregularly, they are superimposed and transmitted while the control signal is being communicated, but when entering a no-signal band, the carrier There was a problem with the lack of signal, which resulted in overruns.

As a countermeasure, intercom devices 4a, 4b,
There is a method of connecting only the section 4c with a separate transmission line, but there is a problem that the number of connected transmission lines increases and this leads to incorrect connection or equipment failure or malfunction due to incorrect connection. In addition, there is a frequency multiplexing method that changes the carrier frequency of the audio signal and the control signal for equipment control, but it requires multiple carrier generation circuits and requires a filter circuit for signal separation and a circuit to avoid mutual crosstalk, which is very difficult. Purpose of the Invention In view of the above-mentioned problems, the present invention has been developed to connect a remote control device that controls a device and a transmitting/receiving device via a transmission line that connects the remote control device and the transmitting/receiving device, which are located in different locations. To provide a signal transmission device that can transmit audio signals as mutual communication between users without interruption, suppress unnecessary carrier signals when audio signals and control signals are not communicated, and has a simple circuit configuration. The purpose is to

Structure of the Invention In order to achieve this object, the signal transmission device of the present invention comprises an intercom device, a microcomputer (hereinafter abbreviated as "maifun") that performs signal processing, and a modulation circuit that transmits the output signal from the microcomputer. , a carrier generation circuit that outputs a carrier signal to the modulation circuit, a call switch that a user presses when using the intercom device, a voice detection circuit that detects a voice signal from the intercom device, and a call switch that the microcomputer presses. a first gate circuit that outputs a control signal when the output of the audio detection circuit and a processing completion signal that is output after the processing is completed and output to the modulation circuit; and a branch output of the carrier generation circuit. a second gate circuit that outputs a carrier signal when both the signal and the output signal of the first gate circuit are input, the modulation circuit, the intercom device, and the output section of the second gate circuit; and a signal separation/superposition circuit that superimposes and separates the modulated signal and the audio signal.

This configuration allows for uninterrupted communication between users between the transmitting/receiving device and the remote control device, and suppresses the impact on other devices by not outputting unnecessary carrier signals during times when there are no audio signals or control signals. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a circuit block diagram of the signal transmission device.

5 is a microcomputer, and 6 is an FM output signal from the microcomputer 5.
7 is a carrier generating circuit that generates a carrier signal; 8 is a call switch that is pressed when using the intercom devices 4a, 4b, and 4c; the connected part is connected to a resistor 9 and input to the microcomputer 5; Reference numeral 10 denotes an audio detection circuit, which includes resistors 12, 13.14, capacitors 15.16, diodes 17.18, and comparator 19. Intercom device 4b
When an audio signal is output from the resistor 11 - capacitor 15
- It is input to the capacitor 16 via the diode 17, smoothed by the resistor 13, and converted into a DC potential. Resistor 12 and 1
4 creates a reference potential for comparison, and when an audio output is detected, the output section of the comparator 19 becomes a "high" level, and normally the voltage is 1.
0-” level.

20 is a first gate circuit to which the output part of the voice detection circuit 10 is input, and is further connected to the output terminal 0° of the microcomputer 5; its output part is input to the second gate circuit 21, and the output part of the carrier generation circuit 7 Branch output is input. Reference numeral 22 denotes a signal separation/superposition circuit that superimposes the modulated control signal of the modulation circuit 6 and the voice signal etc. output from the intercom device 40, and separates the control signal and voice signal etc. transmitted via the transmission line 3. . A limiter circuit 23 clips the FM modulated control signal to a constant level. 24 is a receiving circuit which FM demodulates the control signal and outputs it to the microcomputer 5.

FIG. 3 is a timing chart. When the control signal is being output from the output terminal 6° of the microcomputer, the processing completion signal is at a low level and no signal is output from the outputs of the first gate circuit 20 and the second gate circuit 21. When you press 8 and start speaking, the voice detection circuit 10
The output level becomes "high" level. At this time, if the processing completion signal is "low" level, nothing is output from the second gate circuit 21, and the audio signal is superimposed on the modulation signal and transmitted.

When the microcomputer 5 completes the transmission process, the processing completion signal is set to the 6 high level, the output of the voice detection circuit 10 is also set to the high level, and the output of the first gate circuit 20 is also set to the high level. The gate circuit 21 is the first gate circuit 20
Since a high-level signal is input from the output of the circuit, a carrier signal is output from the output.The audio signal is superimposed on the output signal of the second gate circuit 21 and transmitted.The microcomputer 5 starts the transmission process again. , the output level of the first gate circuit 20 becomes low level and the output level of the second gate circuit 21 disappears. The carrier signal is no longer output.

FIG. 4 is a waveform diagram of each part. While the audio signal is being output, the carrier signal is output from the second gate circuit 21 only when there is no transmission signal from the microcomputer 5. The audio signal is superimposed while the control signal is being output.

In this way, the carrier signal was output only when the audio signal was output and no control signal was output, and the output of the carrier signal was stopped when the audio signal disappeared. In this way, unnecessary radiation that would cause noise to radio equipment such as radios around the transmission line 3 could be prevented.

Effects of the Invention As described above, the signal transmission device of the present invention includes a microcomputer that performs signal processing, a modulation circuit that modulates a control signal output from the microcomputer, and a carrier signal that is output to the modulation circuit. a carrier generation circuit; a voice detection circuit that detects the voice outputted through the intercom device; and when the microcomputer detects the on signal of the call switch and the transmission process is completed, the voice detection circuit outputs a processing completion signal. a first gate circuit to which the output of the first gate circuit and the branch output of the carrier generation circuit are input; a second gate circuit to which the output of the modulation circuit and the second gate are input; It is composed of a signal separation and superposition circuit into which the output of the circuit and the output of the intercom device are input, and when transmitting the voice signal, the control signal is superimposed while it is being output, and when it disappears, it is superimposed on the carrier signal and transmitted. However, since the carrier signal is stopped when the audio signal disappears, it eliminates the malfunction of peripheral devices caused by unnecessary high-frequency signals and the difficulty of use, and improves usability by allowing audio signals to be transmitted without interruption with a relatively simple configuration. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional signal transmission device, FIG. 2 is a block diagram of a signal transmission device according to an embodiment of the present invention, FIG. 3 is a timing diagram of the device, and FIG. 4 is a diagram of each part of the device. FIG. 1 transmitting/receiving device, 2a, 2b remote control device, 3...
Transmission L4a, 4b, intercom device, 5. microcomputer-16... modulation circuit, 7. carrier generation circuit, 8... call switch, 10... voice detection circuit, 20... first gate circuit, 21...Second gate circuit, 22...Signal separation/superposition circuit. Fig. 1 Fig. 2 Fig. 3 Speechist Kaji Higashikan/l-out Kanny - Fig. 4

Claims (1)

[Claims] The device includes a transmitting and receiving device that transmits and receives signals, a plurality of remote control devices that remotely control the transmitting and receiving device, a transmission line that connects the transmitting and receiving device and the plurality of remote control devices, and an intercom device that allows a user to communicate his or her intentions. and a microcomputer that performs signal processing for the transmitting/receiving device and the remote control device, a modulation circuit for transmitting the output signal of the microcomputer, a carrier generation circuit for outputting a carrier signal to the modulation circuit, and a user's intention communication. a call switch that is pressed when using the intercom device, a voice detection circuit that detects the voice output from the intercom device, and a microcomputer that detects the signal from the call switch and outputs it to the modulation circuit after completion of processing. a first gate circuit that outputs a control signal when the signal and the output of the audio detection circuit are input together; and a branch output signal of the carrier generation circuit and the output signal of the first gate circuit are input together. Then, a second gate circuit that outputs a carrier signal, an output section of the modulation circuit, an output section of the second gate circuit, and an output section of the intercom device are input, and the modulation signal and the audio signal are superimposed and separated. A signal transmission device 0 configured with a signal separation and superimposition circuit that