JPS6387054A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To switch an off-hook state to an on-hook state at the side of a mobile equipment by detecting a howler signal at the side of a master equipment and transmitting this detection output to the mobile equipment from the master equipment via a radio line. CONSTITUTION:When a howler signal is received from a converter, a call signal detecting circuit 4 regards the howler signals as a call signal to produce the DC voltage and sends this call signal to a control circuit 5. Thus the circuit 5 decides that it received the howler signal since it is impossible to receive an incoming call in an off-hook state. Then a transmission low frequency control switch 7 is turned off and simultaneously a signal showing the reception of the howler signal is transmitted from a transmitter 12. This signal is received by a receiver 15 of the mobile equipment 3 and the receiver 15 transmits this signal to a control circuit 24. Thus the circuit 24 decides reception of the howler signal and turns off a hook switch 9 to secure an on-hook state.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to cordless telephone devices.

(Prior Art) As is well known, a cordless telephone device includes a main V device connected to a line on the exchange side and a mobile device connected to this main device via a wireless line. You can make calls using .

Conventionally, in this type of cordless telephone device, the mobile device is left in an off-footer state, so when a howler signal is applied to the parent device from another exchange via the line,
The lit device does not transmit this howler signal to the mobile device via a wireless line, but instead blinks a light emitting element (for example, an LED) on the parent device side in response to this howler signal or generates an alarm. Move! It was designed to notify the operator that the 11 aircraft should go on-hook. However, even if the parent device issues a notification to prompt the mobile device to go on-hook in this way, if the mobile device is far from the parent device, the operator near the mobile device tlIFjJ will not be able to detect the notification.

As a result, the mobile IHI is sometimes left off-hook, which prevents the effective use of radio waves, incurs unnecessary charges, and accelerates the consumption of the mobile device's battery. .

Note that the reason why the parent device does not transmit the howler signal to the mobile device is because the level of the howler signal is much higher than the level of the voice signal, for example, if the frequency change SL! l(FM
), if this Howler signal is transmitted using a carrier wave signal, the level of the Howler signal received by the mobile device will be reduced due to the limit on the maximum frequency shift.

(Problems to be Solved by the Invention) As described above, in conventional cordless telephone devices, the mobile device may be left in an off-hook state, which prevents effective use of radio waves and causes unnecessary charges. However, there were problems such as the battery being equipped with a mobile device being depleted more quickly.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cordless telephone device that does not leave the eight ribs 1 in an off-hook state.

(Structure of the Invention) (Means for Solving the Problems) A cordless telephone device according to the present invention detects a howler signal applied from a line on the parent device side, and transmits the detection output from the parent device via a wireless line. In response to this, the mobile device switches the mobile device from an off-hook state to an on-hook state.

(Function) According to the cordless telephone device according to the present invention, when a howler signal is applied to the parent device side, the ! 1ll1 aircraft is switched from off-hook to on-hook.

(Embodiment) An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The drawing is a block diagram, not showing an embodiment of the cordless telephone device according to the present invention. In the figure, the cordless telephone device includes a master device 2 connected to a telephone line m1, and a mobile device 3 connected to the master device 2 via a wireless line. Now, in the standby state, when a ringing signal transmitted from the exchange via circuit PJ1 is input to the ringing signal detection circuit 4, the ringing signal detection circuit 4 rectifies this ringing signal to form a DC voltage. If this DC voltage is above a preset threshold, a signal indicating that there is an incoming call is sent to the control circuit 5.
Add to. When the control circuit 15 receives this signal, it determines that there is an incoming call, forms a wireless link between the master device 2 and the mobile 13, turns on the switch 6, and turns on the transmitting low frequency control switch 7 and the receiving low frequency control switch 7. Turn on each frequency control switch 8. At this time, the mobile n3 is called by the parent device 2 via the wireless line, placed in an off-hook state, and the hook switch 9 is turned on. Therefore, line 1→switch 6→hybrid circuit 10→transmission low frequency amplification circuit 21! i
11 -> Transmission low frequency control switch 7 -> Transmitter 12 -> Transmission antenna 13 -> Receiving antenna 14 -> Receiving t115 -> Receiver 16.
→Transmitter 18→Transmission antenna 19→Reception antenna 20→
A transmission path is formed: reception n21→reception low frequency control switch 8→reception low frequency amplification circuit 22→hybrid circuit 10→switch 6→line 1. Further, when the mobile R3 is placed in an off-hook state and the hook switch 9 is turned on to make a call, a wireless line is formed between the parent device 2 and the mobile 13, and the control circuit 5 is connected to the switch 6. is turned on, and a signal corresponding to the dial number of the other party indicated from the mobile n2 is applied to the bush dial signal generator 23 via the wireless line. When the bush dial signal generator 23 receives this signal, it sends a selection signal indicating the dial number of the other party via the hybrid circuit 10.
! It will be sent to 1. After this, the control circuit 6 transmits low frequency! l
Turn on the i-control switch 7 and the reception low-frequency control switch 8, respectively.

Now, in this embodiment, the mobile device 3 is left in the off-hook state and the hook switch 9 is turned on, so when the switch 6 in the parent device 2 is turned on, the When the howler signal is transmitted from the exchange via line f1m1, this howler signal is input to the calling signal detection circuit 4. The ringing signal detection circuit 4 rectifies this howler signal to form a DC voltage, but since this howler signal is at almost the same level as the ringing signal, the formed DC voltage exceeds a preset threshold and an incoming call is detected. A signal similar to that in the case of is applied to the control circuit 5. When the control circuit 5 receives this signal, it determines that a howler signal has been received since there is no possibility of an incoming call in the off-hook state. Then, the transmission low frequency control switch 7 is turned off, and a redundant signal, for example, indicating that the Howler signal has been received is applied to the transmitter 12. Therefore, this signal is sent from the transmitter 12 → transmitting antenna 13 → receiving antenna 1
4→transmitted to the receiver 15, and further added to the control circuit 24 from the receiver 15. When the control circuit 24 receives this signal, it determines that the howler signal has been received, and turns off the hook switch 9 to place it in an on-hook state. In order to hold the hook switch 9 in the OFF position, for example, a self-holding type reed switch may be used as the hook switch 9 and the hook switch 9 may be turned OFF.

As described above, in this embodiment, when the howler signal is applied to the parent device 2 side, the hook switch 9 on the mobile device 3 side is turned from on to off, and the off-hook state is switched to the on-hook state.

〔Effect of the invention〕

As explained above, according to the present invention, when a howler signal is applied to the parent device side, the mobile device is switched from the off-hook state to the on-hook state, so that the mobile device is not left in the off-hook state. A cordless telephone device can be provided.

Therefore, effective use of radio waves, reduction of charges, and transfer!
This is effective in saving the batteries included in the 7Ia.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of a cordless telephone device according to the present invention. 1... Line, 2... Parent device, 3... Mobile device, 4...
...Call signal detection circuit, 5.24...Control circuit, 6.
...Switch, 7... Transmission low frequency control switch, 8.
...Reception low frequency control switch, 9...Hook switch, 10...Hybrid circuit, 11...Transmission low frequency amplification circuit, 12.18...Transmitter, 13.19...
Transmission antenna, 14.20...Reception antenna, 15.
21... Receiver, 16... Receiver, 17... Transmitter, 22... Receiving low frequency amplifier circuit, 23... Bush dial signal generator.

Claims (2)

[Claims] (1) In a cordless telephone device comprising a parent device connected to a line and a mobile device connected to the parent device via a wireless line, a howler signal provided in the parent device and applied from the line a howler signal detection means for detecting the howler signal detection means; a transmission means for transmitting the detection output of the howler signal detection means from the parent device to the mobile device via the wireless line; 1. A cordless telephone device comprising: switching means for switching the mobile device from an off-hook state to an on-hook state upon receiving a detection output of the above. (2) The cordless telephone device according to claim (1), wherein the howler signal detection means is a ringing signal detection circuit provided in the parent device.