JPS62173822A - Cordless interphone - Google Patents

Abstract

PURPOSE:To extend the system scale of a cordless interphone by providing a radio repeater, which is connected to a slave device with a wire, in the slave device side installed outdoors. CONSTITUTION:A radio repeater (transmitter-receiver) B is connected to an outdoors installed device A through a wire transmission line 4. When receiving a call from the slave device A, a power supply control circuit 55 of the repeater B operates the repeater B for a certain time and modulates a ringing tone, which is generated in a tone generating circuit 54, by a modulating circuit 52 and transmits it toward a master device. When receiving a response signal from the master device, a carry detecting circuit 65 stops the operation of the tone generating circuit 54 and extends the power supply time of the power supply control circuit 55 for service. If service radio waves are broken, the power supply control circuit turns off a power source after a certain time.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to improvements in cordless intercoms.

, Foreground Technology] Recently, cordless intercoms using weak radio waves have been developed for general home use.

In this system, a doorbell slave is installed in the garden or at the gate, and a master unit is installed in the home to enable mutual calls to be made wirelessly. Such a cordless intercom does not use a commercial power source and has a built-in battery to supply the necessary power.

Therefore, it is required to save energy by avoiding battery replacement as much as possible.

By the way, in response to such a request, the present applicant proposed a cordless intercom having an automatic power cutoff function as a wireless communication device in Japanese Patent Application No. 59-277050.

The basic configuration of this device is that one or both of the parent device and the hanging device are provided with a power supply control circuit, and this i-source control circuit includes a carry detection circuit, a timer circuit, and logic for making necessary logical decisions. Equipped with a circuit, when outputting a calling signal, the timer circuit is activated at the same time as the power is turned on to prepare for reception of call radio waves, and when the carry circuit detects call radio waves, the generation of the call signal is stopped and the call is stopped. When the telephone radio waves are cut off, the timer circuit is activated again and the power is cut off after a predetermined time delay.

[Purpose of the invention]

An object of the present invention is to provide an improved cordless intercom incorporating the above-mentioned power supply control circuit, and in particular to provide a repeater connected by wire to a nuclear device on the side of the hanging device installed outdoors. The aim is to expand the scale of cordless intercom systems that use weak radio waves.

[Disclosure of the invention]

The present invention proposed to achieve the above objects is as follows:
This relates to an improvement of a cordless intercom that enables mutual communication between the main device and the hanging device via a repeater, in which the repeater is connected to the hanging device by wire, and the voice output from the main device is A receiving circuit that receives radio waves modulated by signals,
It is equipped with a transmission circuit that transmits a radio wave modulated by the audio signal output from the hanging device, and a power supply control circuit that controls the power supply to each circuit section of the medium-sized device, and furthermore, this power supply control circuit includes the above-mentioned power supply control circuit. A timer circuit that automatically turns on the power when it receives a call signal from the hanging device and shuts off the power after a predetermined period of time, a carry detection circuit that detects radio waves transmitted from the parent device, and this carry detection circuit. When it detects radio waves transmitted from the parent device, it stops generating tone signals during a call and continues to turn on TA for a call, while when the call radio waves are cut off, it activates the timer circuit mentioned above. It is configured with a logic circuit that delays and shuts off the power supply.

Example FIG. 1 shows a hanging device A and a repeater B that constitute the present invention.

Parent device C is shown.

Hanging device A constitutes a so-called doorbell, and has a call button 30. Mike 31. It has a speaker 32. This hoist A is connected to a repeater B via a signal cable 4.

Although the main body 21 of the repeater B is partially cut away to expose the connection terminals, it has a loft antenna 20, and within the main body 21 is a transmitting circuit 5 as shown in FIG. ．． A receiving circuit 6 is provided.

Moreover, the main unit C has a portable and handy structure, and has a loft antenna IO for transmitting and receiving radio waves between it and the repeater B, and includes a speaker 111, a call button 121, a call indicator light 13. The configuration includes a microphone 14. Here, the call button L2 is pressed during a call, and the call indicator light 13 lights up during a call, but does not turn on if the battery runs out.

FIG. 2 is a system diagram showing the configuration of the hanger A and the repeater B.

The hoist A and the repeater B are connected by wire via a signal cable 4.

Repeater B includes a transmitting circuit 5. surrounded by a broken line. A receiving circuit 6 is provided, and a power supply control circuit 55 supplies necessary power to these circuits 5 and 6. The buzzer sound generator 7 generates a bank tone signal that sounds on the slave unit A side when the parent unit C calls, and the antenna 20 receives the signal generated on the slave unit A side by the transmitting circuit 5. It emits radio waves and also catches the radio waves generated on the parent unit C side. Transmission circuit 5. Since the basic configuration of the receiving circuit 6 is common, the explanation will be omitted by using the drawings instead, and only the parts related to the present invention will be explained below. Furthermore, 53
．． 64 is AMP.

Next, the configuration and operation of the power supply control circuit 55 will be explained.

This power supply control circuit 55 is driven by the calling operation of the half word A, and automatically shuts off the power after a predetermined delay time after the calling operation or after the telephone radio waves are cut off. In order to enable such delay operation, a timer circuit and a logic circuit are provided.

FIG. 3 shows a timer circuit that constitutes the main part of the power supply control circuit 55 and a logic circuit that drives this timer circuit. Although the logic circuit is not labeled, it is constructed by combining a plurality of transistors and a plurality of diodes.

The operation of the power supply control circuit 55 will be explained with reference to FIGS. 2 and 3. When the half word A call button 30 is pressed,
A base current flows through the transistor Q1 by the power supply Vcc attached to the power supply control circuit 55 (corresponding to the battery 56 shown in the second part), turning it on (the power supply Vcc-
A loop of resistor R1-resistor R2-diode Dyl is formed).

At the same time, transistor Q3. Base current also flows through the transistor Q5, turning it on (voltage [VcC - resistor R5
- Resistor R6 - Diode Dy2 loop, power supply Vcc -
A loop of resistor R9-resistor R10-diode Dy3 is formed). As a result, what about the circuits of each part? IT source voltage V
cc is supplied, the RS flip-flop is set, and at the same time transistors Q6. Q7 turns ON.

When the RS flip-flop is set, ICI, TC
2. The output of the tone generating circuit 54, which is composed of capacitors C1 and C2 and an inductance, is sent to the transmitting circuit 5 via an AND gate, and from the repeater B, a radio wave modulated with a calling signal is sent to the parent unit C. is emitted. In parent C,
A receiving circuit (not shown, but having a configuration similar to that built into repeater B) receives this radio wave, demodulates it, and confirms it as a calling signal. At this time, on the hanger A side, the buzzer generating section 7 is driven, and a bank tone for confirming the call of the parent device C is outputted from the speaker 32.

Also, transistor Q6. When Q7 is turned on, the charges stored in capacitors C3 and C4 are immediately discharged. As a result, the transistor Q2 turns on (the voltage across the capacitor C3 becomes almost 0, but the rHJ level is inverted by the inverter circuit fc5, so
Base current flows through transistor Q2, turning it on)
. When transistor Q2 turns on, Vcc-R1-R
2-C2 is formed, and the power supply Vcc is continuously supplied to each circuit.

Therefore, when the call button 30 is pressed in a one-shot operation, 1 Vcc of electricity is sent to each circuit until the transistor Q2 is turned off, and the capacitors C3 and C4 start charging.

Then, the capacitor C4 is charged, and the voltage applied to the resistor R16 connected to the capacitor C4 decreases with the charging, and when it drops to a predetermined level, the inverter lc
6. rL to the base of transistor Q2 via IC5.
The J level signal is sent, and transistor Q2 is turned off.

Therefore, in this state, power supply to the circuits of each part is cut off. In other words, the power supply Vcc is the call button 3
After the one-shot operation of 0, the tone generation circuit 54 is operated for a time Td set by the timer circuit 5L and then shut off.

The operation in this case is shown in FIG. Then, a carry signal is output from the receiving circuit 6, turning on the transistor Q4. As a result, the RS flip-flop is reset and the tone signal that was being output via the AND gate is immediately stopped, but since transistor Q2 is still on in this state, power continues to be supplied to each circuit. is supplied to enable calls. Then, when the call ends or is interrupted, the carry detection circuit 65 detects this state and turns off the transistor Q4. As a result, the transistor Q5, which had been turned on, is turned off and drives the timer circuit 5t.

When the timer circuit 5t is driven, the transistor Q2 is turned off at the set time T d 77 of this circuit, and the power supply is automatically cut off. Therefore, if the time To when the call radio wave is interrupted is shorter than the set time Td, the supply of Ml[ is continued due to the delay operation of the timer circuit 5t.

FIG. 5 is a timing chart showing the operation when a call is continuously made, and FIG. 6 is a timing chart showing the operation when the call is interrupted midway. As shown in FIG. 6, when such a power control circuit 55 is provided, even if a call is interrupted midway through, the power is prevented from being cut off for the time set by the timer circuit 5t. , is resistant to noise and allows for smooth calls.

〔Effect of the invention〕

According to the present invention, half words installed outdoors are connected by wire to a repeater, and mutual communication is performed by transmitting and receiving radio waves between the repeater and the parent device, so half words are used. If you install the repeater in a convenient location and use it in a location that is advantageous for radio wave propagation, such as the outside wall of a house, you can expand the scale of the system even if the power output is weak, and expand the range of use of the wireless method. It can be expanded and the commercial value can be increased.

In addition, the repeater is equipped with a power control circuit that turns on the power only when a call is in progress, and automatically shuts off the power after a predetermined delay when the call is completed, saving energy and even for one-shot calls. In addition to being able to reliably call the other party, even if the call is interrupted due to noise etc., the power is turned on for a predetermined period of time, so the call status is not interrupted inadvertently, and reliability is improved. You can get a cordless intercom.

[Brief explanation of drawings]

Figure i1 is an external view of one embodiment of the cordless intercom of the present invention, Figure 2 is a system diagram showing the configuration of a repeater and a half word, and Figure 3
The figure is a circuit diagram of the power supply control circuit, and Figures 4 to 6 are the power supply 11.
3 is a timing chart illustrating the operation of one circuit. (Explanation of symbols) A... Half word B... Relay C... Master device 5... Transmission circuit 6... Receiving circuit 55... Power supply control circuit 65... Carry detection circuit 5t...・Timer circuit patent applicant Matsushita Electric Works Co., Ltd. Agent Patent attorney Hiroyuki Chugai Figure 4 Figure 5 Figure 6 Procedural Amendment (Spontaneous [September 1, 2006, 1, Case Description 1985 Patent Application No. 15425] 2,
Name of the invention Cordless intercom 3, Relationship to the case of the person making the amendment Patent applicant address 1048 Oaza Kadoma, Kadoma-shi, Osaka Name Matsushita Electric Works Co., Ltd. 5 Date of amendment order Voluntary The statement ``Provided with a logic circuit'' ``Provide a logic circuit and correct it to j.

Claims (1)

[Claims] A cordless intercom that enables mutual communication between a master device and a slave device via a repeater, wherein the repeater is connected to the slave device by wire, and output from the master device is provided. A receiving circuit that receives radio waves modulated with the audio signal, a transmitting circuit that transmits the radio waves modulated with the audio signal output from the slave device, and a power supply control circuit that controls the power supplied to each circuit section of the repeater. and the power control circuit includes a timer circuit that automatically turns on the power when receiving a call signal from the slave device and shuts off the power after a predetermined time, and detects radio waves transmitted from the parent device. When the carry detection circuit and this carry detection circuit detect radio waves transmitted from the main device, the generation of tone signals during a call is stopped and the power is turned on for a call, but the call radio waves are interrupted. A cordless intercom characterized in that it is configured to include a logic circuit that activates the timer circuit to delay and cut off the power supply when the timer circuit is activated.