JPH0628347B2 - Wireless telephone - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a radiotelephone device for reducing the current consumption of a radiotelephone operated by a battery power source.

[Technical background of the invention]

Conventionally, as shown in FIG. 1, a radiotelephone device including a parent device 2 connected to a wired telephone line 1 and a radiotelephone 3 connected to the parent device 2 by a radio line is generally used.

In this case, the parent device 2 includes a wireless transmitter 4, a wireless receiver 5, a control circuit 6 for controlling these transceivers, and the like, and an audio signal input from the wired telephone line 1 is transmitted to the line relay 7 and the hybrid. It is input as a modulated signal to the transmitter 4 via the circuit 8 and is transmitted from the transmitting antenna 9 to the telephone 3 as a radio wave ta. In addition, the receiving antenna 10 receives the electric wire f _b from the telephone 3, and the receiver 5 demodulates it.
It is sent to the wired telephone circuit 1 via the hybrid circuit 8.

Meanwhile radiotelephone 3, the radio receiver 11, radio transmitter 12, includes an oscillation circuit 13 and the control circuit 14 or the like for generating a ringing tone, receives radio waves f _a transmitted from the parent device 2 antennas 15 The receiver 11 demodulates it and the receiver 16 generates a voice signal. The voice signal input from the transmitter 17 is input to the transmitter 12 and is transmitted from the transmission antenna 18 as a radio wave f _b .

Here, the parent device 2 is normally configured to operate with a commercial power source, and the wireless telephone 3 operates with a battery 19 as a power source. During standby, the control circuits 6 and 14 of the parent device 2 and the telephone 3 turn off the power supplies of the transmitters 4 and 12, respectively, and stop the transmission of radio waves in order to improve the efficiency of use of radio waves. On the other hand, the receivers 5 and 11 are always connected to the power source and in the operating state in order to detect the arrival of the connection control signal from the other party.

When the switch 20 of the wireless telephone 3 is turned on at the time of calling in the above-mentioned configuration, the control circuit 14 inputs the calling signal to the transmitter 12 as a modulation signal, and the radio wave f _b modulated by the calling signal is transmitted to the parent. It is sent to the device 2. In the parent device 2, the radio wave f _b is demodulated by the receiver 5, and when this is detected by the control circuit 6, the radio wave f _a modulated by the call response signal is sent out, and the call response signal is detected by the telephone 3. Then, the transmission of the calling signal is stopped and the call is established. The parent device 2 is the telephone 3
When the stop of the calling signal is detected, the transmission of the calling response signal is stopped, and at the same time, the line relay 7 is closed and a DC loop is formed to the exchange through the wired telephone line 2.

On the other hand, at the time of an incoming call, when the parent device 2 detects a call signal of 16 Hz sent from the exchange through the wired telephone line 1, the parent device 2 sends the incoming call signal from the transmitter 4 to the telephone 3 as _a radio wave fa. When the telephone 3 detects this, the oscillation circuit 13
Operates to generate a ringing sound from the speaker 21. Here, when the switch 20 is turned on, an incoming call response signal is transmitted from the telephone 3, and when this signal is detected by the parent device 2, the parent device 2
Stops sending the incoming call signal, and when the telephone set 3 detects that the parent device 2 stops sending the incoming call signal, the telephone set 3 stops sending the incoming call response signal and enters into the call state at the same time. When the stop of the response signal is detected, the line relay 7 is closed and a DC loop is formed for the exchange.

As described above, the telephone 3 is connected to the wired telephone line 1 via the wireless line formed with the parent device 2.

[Problems of background technology]

In the above-mentioned conventional wireless telephone device, the receiver 11 of the telephone 3 which is operated by the battery power source is always operating even when waiting for an incoming call signal or an off-hook of the handset. During standby, which occupies a part of the time, the receiver 11 is operating, so that the battery 19 is significantly consumed.

As one method of avoiding this drawback, there is an intermittent reception method in which the receiver 11 is operated intermittently during standby. For example,
The control circuit 14 measures the current consumption of each part of the telephone 3 by 1 m.
A, the receiver 11 is 10 mA, the transmitter 12 is 30 mA, the number of calls per day is 10, and the average talk time is 3.5 minutes. Assuming that it is on and off, the average current consumption without this intermittent reception method is When standby While the total is 11.7mA, when applying the intermittent reception method described above, 1.0mA during a call and during a standby It seems that the total purpose is reduced to 4.4mA, and it seems that the primary purpose can be achieved, but even this still consumes more current during standby, which is insufficient for the purpose of lowering current consumption. Of course, it is possible to reduce the intermittent time ratio to further reduce the current consumption, but since it takes connection time correspondingly, there is a certain limit to lowering the intermittent reception time ratio, and for the purpose of lowering the current consumption, It has never been a fundamental solution.

[Object of the Invention]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional wireless telephone device and to provide a wireless telephone device including a wireless telephone capable of significantly reducing current consumption.

[Outline of Invention]

According to the present invention, a wireless incoming call notification means that operates on a commercial power source and generates a ringing tone in response to reception of a wireless incoming call signal from the parent device is provided, and the transmission / reception power source of the wireless telephone during standby is provided. By doing so, the above-mentioned purpose is achieved.

Example of Invention

FIG. 2 shows an embodiment of the present invention, in which the same parts as those in FIG. 1 are designated by the same reference numerals, and similar parts are designated by the same reference numerals with “Dash”.

The wireless telephone device of FIG. 2 is different from that of FIG. 1 in that the wireless telephone 22 does not include the oscillation circuit 13 and the speaker 21 for generating a ringing tone, and instead, the parent device 2 ′.
A radio reception device 23 that receives a radio wave fa transmitted from the receiver 23 and _a radio reception device that is operated by a commercial power source and includes an oscillator circuit 13 and a speaker 21 that generate a ringing tone based on the reception of a reception signal in the reception device 23. The call alarm 24 is provided. When the switch 20 turns off during standby,
As a result, the power supply from the battery 19 to the wireless telephone 22 is completely cut off.

In the above configuration, when the call is made, the switch 20 is turned on so that the call connection is made in the same manner as in the case of FIG.

On the other hand, when receiving an incoming call, the receiving antenna of the incoming call alarm 24
25, the receiver 23 and the control circuit 26 generate a ringing tone from the speaker 21 as in the case of FIG. 1, and the operator hears this ringing tone and turns on the switch 20, so that the telephone 22 is first turned on. Power is supplied from the battery 19 to activate the telephone 22, and a wireless line is formed with the parent device 2 ', and the telephone 22 is connected to the wired telephone line 2 via this wireless line. Further, the incoming call annunciator 24 is provided with a rectifier circuit 27 for converting alternating current from a commercial alternating current power source into a direct current. By providing the incoming call annunciator 24 which operates with such a commercial power source, the telephone set 22 in standby mode. Can be turned off,
Current consumption is zero. Therefore, the average current consumption of the telephone 22 is the same as the above-mentioned call condition, The current consumption is In case of intermittent reception Will be reduced to.

Here, the battery 19 that is the power source of the telephone 22 is of a rechargeable type, and the telephone 22 is provided with a charging terminal 28, and a charging DC current can be derived from the rectifier circuit 27 of the incoming call notification device 24 through the terminal 29. In this way, the battery 19 can be charged by connecting the terminals 28 and 29. Therefore,
The capacity of the battery 19 can be reduced to further reduce the size of the telephone 22.

The present invention is not limited to the above embodiment,
Various modifications are possible without departing from the spirit of the
For example, all the power supplies of the wireless telephone may not be turned off during standby, and only the control circuit that operates with a small current may be kept in the operating state. Further, as the multi-channel access, the radio frequency at the time of a call may be arbitrarily set, and further, the frequency of the radio wave transmitted from the parent device to the wireless telephone and the frequency of the radio wave transmitted to the wireless incoming call notification device. It is also possible to differ.

〔The invention's effect〕

As described above, according to the present invention, since both the transmitter and the receiver of the wireless telephone are turned off in the standby state, it is possible to greatly reduce the current consumption of the battery which is the power source of the wireless telephone. The life of the battery can be extended and the battery can be downsized.
Further, since the radio telephone does not require a circuit for generating a ringing tone, the radio telephone can be made compact and lightweight and easy to carry.

[Brief description of drawings]

FIG. 1 is a block diagram of a conventional radiotelephone device, and FIG. 2 is a block diagram of an embodiment of a radiotelephone device according to the present invention. 1 ... Wired telephone line, 2, 2 '... Parent device, 3, 22 ...
Radio telephone, 4, 12 ... Transmitter, 5, 11, 23 ... Receiver, 6, 6 ', 14, 14', 26 ... Control circuit, 7 ... Line relay, 8 ... Hybrid circuit, 9 , 18 …… Transmission antenna, 10,15,25 …… Reception antenna, 13 …… Oscillation circuit, 16 …… Handset, 17 …… Speaker, 19 …… Battery, 20 ……
Switch, 21 …… Speaker, 24 …… Wireless incoming call alarm, 27
...... Rectifier circuit, 28,29 ...... Terminal.

Claims (1)

[Claims] 1. A wireless telephone device comprising a parent device connected to a telephone line and a wireless telephone connected to the parent device via a wireless line, wherein the wireless telephone device operates from a commercial power source and receives wireless communication from the parent device. A radiotelephone device, characterized in that a radio incoming call notification means for generating a ringing tone in response to reception of a call signal is provided, and transmission / reception power of the radiotelephone during standby is cut off.