JPH02184148A - Parent-child cordless telephone device - Google Patents

Abstract

PURPOSE:To share one selection signal generating circuit with a master set and a slave set and to prevent mis-dialing by providing a gate circuit between a key switch contact of the master set and a selection signal generating circuit. CONSTITUTION:A gate circuit 13 is provided between a key switch circuit 14 and a selection signal generating circuit 10 of a master set. Then the gate circuit 13 is controlled so that the key switch circuit 14 and the selection signal generating circuit 10 are connected while the master set is in use of a trunk line or the trunk line is busy and the key switching circuit 14 and the selection signal generating circuit 10 are disconnected while the slave set is busy. Thus, even if the key switching circuit 14 of the master set is operated in mistake during the talking of the slave set, the transmission of an erroneous selection signal is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial field of application to which the invention pertains The present invention relates to a parent-child type cordless telephone device.

(2) Conventional technology A conventional cordless telephone device consists of a connecting device (base unit) that is connected to a telephone line, and a cordless telephone (slave unit) that communicates with the telephone line using radio waves via the connecting device. Since the selection signal generating circuit simply sent a selection signal to the telephone line in accordance with the dialing information sent from the cordless telephone, there was no possibility of incorrect dialing.

However, in a parent-child type cordless telephone device in which the connecting device is equipped with a call function and a selection signal generation circuit common to the handset, it is possible to make calls from both the cordless telephone and the connecting device. In order to prevent incorrect dialing caused by pressing the dial button on the master m (connection device) while the handset (cordless telephone) is making a call to the central office line, two selection signal generation circuits are used, one for the base unit and one for the slave unit. The selection signal generation circuit for the base unit, which is not used while the slave unit is making a call to the central office line, had to be disconnected from the telephone line. In addition, in order to prevent the generation of dial pulses or MF multiplication signals that interfere with calls when the dial button is pressed down on the base unit while the slave unit is talking on the central office line, the selection signal generation circuit for the base unit can be used in the same manner as described above. 2 for slave unit
This is economically disadvantageous because a selection signal generation circuit for the base unit, which is not used while the slave unit is making a call to the central office line, must be separated from the telephone line.

Another method is to install a selection signal generation circuit in the base unit that is common to the slave unit, and the control circuit of the base unit transmits only the dial information of the base unit when the base unit makes a call to the local line, and the slave unit transmits only the dial information of the base unit when making a call to the local line. In such a case, incorrect dialing can be prevented by identifying only the dial information of the slave unit and transmitting it to the selection signal generation circuit, but since the base unit cannot be used during a power outage, the base unit must also be equipped with a battery.

(3) Purpose of the Invention In view of the above points, the purpose of the present invention is to provide a parent-child type cordless telephone device with a gate circuit between the key switch circuit of the base unit (connection device) and the selection signal generation circuit. It is an object of the present invention to provide a parent-child type cordless telephone device in which a single selection signal generation circuit is shared between a base unit and a slave unit.

(4) Structure and operation of the invention FIGS. 1(a) and 1(b) show a master unit and a slave unit showing one embodiment of the present invention. In the base unit (a), l is the telephone line, 2 is the base unit (connection device), 3 is the slave unit (cordless phone), 4
5 is a rectifier circuit; 6 is a receiving circuit; 7 is a sounder that converts the output of the receiving circuit 6 into audio output; 8 is a photocoupler circuit that transmits the output of the receiving circuit 6 to the control circuit; 9 10 is a selection signal generation circuit, 11 is a selection signal sending circuit, 12 is a communication circuit, 13 is a handset, 14 is a key switch circuit, 15 is a gate circuit, 16 is a radio reception circuit, and 17 is a relay that performs DC connection. receiving antenna,
18 is a radio transmitting circuit, 19 is a transmitting antenna, 20 is a frequency synthesizer, 21 is a relay that switches the connection of the communication circuit, 22 is a two-circuit hook switch, 23 is a control circuit,
24 is a photocoupler circuit that electrically isolates the telephone circuit 4 and the control circuit 23; 25 is a power supply circuit that supplies power to circuits other than the telephone circuit 4; However, each circuit constituting the telephone circuit 4 operates through the telephone line 1 using the central office battery as a power source.

In the handset shown in (b), 31 is a radio transmitting circuit, 32 is a transmitting antenna, 33 is a radio receiving circuit, 34 is a receiving antenna, 35 is a frequency synthesizer, 36 is a control circuit, 37 is a key switch circuit, and 38 is a transmitter. device, 39 is the receiver, 40
is a battery.

First, an outline of the operation when transmitting a selection signal from the sharpener 2 to the telephone line l will be explained. When the off-footer is operated on the main unit 2, the hook switch 22 changes from "off" to "on", and the off-footer signal is input to the control circuit 23, which receives this signal and sends it to the relay 21. At the same time as the receiver 13 outputs a signal for connection to the communication circuit 12, it also outputs a DC connection signal to the relay 9 through the photocoupler circuit 24. Therefore, a direct current flows through the telephone line 1. At the same time, the control circuit 23 is connected to the gate circuit 15.
On the other hand, a gate open signal is outputted through the photocoupler circuit 24 so that the signal from the key switch circuit 14 is transmitted to the selection signal generation circuit IO. Therefore, when the key switch circuit 14 is operated, the signal from the key switch circuit 14 is transmitted to the selection signal generation circuit 10 via the gate circuit 15, and from the selection signal 2 generation circuit IO to the selection signal transmission circuit 11.
A selection signal is output to the telephone line 1, and the selection signal is sent from the selection signal sending circuit 11 to the telephone line 1.

Next, an outline of the operation will be described when the handset 3 performs an operation to make a call to the central office line, and the base unit 2 sends a selection signal to the telephone line l in accordance with the operation of the handset 3.

When the key switch circuit 37 of the handset 3 performs a central line acquisition operation, a signal requesting central line acquisition is transmitted from the handset control circuit 36 to the radio transmitting circuit 31, and radio waves are emitted from the transmitting antenna 32 to The demodulated signal is input to the radio reception circuit 16 through the reception antenna 17 of the machine 2 and sent to the control circuit 23.
is input to.

The control circuit 23 of the base unit 2, which has received the signal requesting station line capture from the slave unit 3, outputs a DC connection signal to the relay 9 through the photocoupler circuit 24, and then outputs a DC connection signal to the relay 21 to connect the radio receiving circuit. 16 and the wireless transmitter circuit 18 output a signal to be connected to the communication circuit 12, and the signal from the key switch circuit 14 is prevented from being transmitted to the gate circuit 15 through the photocoupler 24a in the photocoupler circuit 24 to the selection signal generation circuit 10. Outputs gate close signal. Through the above processing, the handset 2 is electrically connected to the telephone line 1 through the wireless line, and it becomes possible to send a selection signal.

If you operate the dial on the key switch circuit 37 of the handset 2, the signal from the key switch circuit 37 will be transmitted to the control circuit 3 of the handset.
6, and from the control circuit 36 to the wireless transmitter circuit 3 of the handset.
1. Transmitting antenna of slave unit 32° wireless line, receiving antenna of base unit 17. Base unit wireless receiving circuit 16. The key switch signal operated by the slave unit is transmitted to the control circuit 23 of the base unit, and the control circuit 23 of the base unit sends a selection signal generation signal corresponding to the dial operation of the slave unit to the selection signal generation circuit IO. The selection signal generation circuit 10 outputs a selection signal generation signal to the selection signal transmission circuit 11, the selection output generation circuit 10 outputs a selection signal to the selection signal transmission circuit 11, and the selection signal is sent to the telephone line 1. is sent.

Next, the operation during a power outage will be explained. During a power outage, no current is supplied from the power supply circuit 25 of the main unit 2 to each circuit, so
Exclude telephone circuit 4 (the circuit inside the base unit will be in a stopped state. However, in the event of a power outage, the contacts of relays 9 and 21 shall be connected as shown in the figure, and one input of gate circuit 15 shall be connected as shown in the figure. Since the information of the key switch circuit 14 is pulled up to high level by the station battery, the information of the key switch circuit 14 is transferred to the selection signal generating circuit 1.
0.

Furthermore, since each circuit of the base unit is stopped, the slave unit no longer functions as a telephone.

The operation when an incoming signal arrives from a telephone line will be explained. When an incoming call signal arrives from the telephone line 1, the incoming call circuit 6 operates and outputs an electrical signal to the sounder 7, causing the sounder 7 to make a sound. When the hook amplifier is operated, the hook switch 22
becomes a contact, direct current flows through the telephone line 1, and a telephone conversation becomes possible.

The operation when performing the operation of making a central line call will be explained.

When the footer-up operation is performed, the hook switch 22 is connected and direct current flows through the telephone line 1, making it possible to send out a selection signal. When the key switch circuit 14 is operated here, the signal from the key switch circuit 14 is transmitted to the selection signal generation circuit 10 through the gate circuit 15.
The selection signal output from the selection signal sending circuit 11. Hook switch 22. Relay 9. The signal is sent to the telephone line 1 through the rectifier circuit 5, and if the other party answers, the call becomes possible.

(5) As described in detail, according to the present invention, the gate circuit 1 is connected between the key switch circuit 14 of the base unit and the selection signal generation circuit IO.
3 is provided, and the gate circuit 13 is connected to the key switch circuit 14 and the selection signal generation circuit 1O when the base unit is making a call on the local line or talking on the local line, and connects the key switch circuit 14 and the selection signal generating circuit 1O when the slave unit is making a call. By controlling the selection signal generation circuit 10 to be in a separated state, even if the handset unit accidentally operates the key switch circuit 14 of the base unit during a call, the sending of an erroneous selection signal can be prevented. There is.

Moreover, by adopting the configuration shown in FIG. 1, the telephone function of the base unit is guaranteed even in the event of a power outage.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are block diagrams showing configuration examples of a parent device and a slave device used in an embodiment of the present invention. l...Telephone line, 2...Base unit (connection device), 3...
... Handset (cordless telephone), 4 ... Telephone circuit, 5 ... Rectifier circuit, 6 ... Incoming call circuit, 7 ...
Sounder, 8.24...Photocoupler circuit, 9.21
...Relay 10...Selection signal generation circuit, 11...
- Selection signal sending circuit, 12... Call circuit, 13...
Handset, 14.37...Key switch circuit, 15
...Gate circuit, 16.33...Radio receiving circuit, 1
7.34...Receiving antenna, 18.31...Radio transmitting circuit, 19.32...Transmitting antenna, 20.35.
...Frequency synthesizer, 22...Hook switch, 23.36 Transmitter, ...Control circuit, 39...Telephone receiver, 25...Power supply circuit, 40...Battery. 38...

Claims (2)

[Claims] (1) The connection device that serves as the base unit has one selection signal generation circuit, and the selection signal generation circuit is used when the base unit makes a call and also when the cordless telephone that serves as the slave unit makes a call. A parent-child type cordless telephone device, comprising a gate circuit between the selection signal generation circuit existing in the parent unit and the key contact, and when the handset is in an outgoing or central line communication state, the gate circuit The present invention is characterized in that the key contact information of the base unit is prohibited, and when the base unit is in an outgoing or central line communication state, control is performed to allow the key contact information of the base unit to pass through the gate circuit. Parent-child cordless telephone device. (2) The parent-child type cordless telephone device according to claim 1, wherein the calling circuit, the receiving circuit, the selection signal generation circuit, and the selection signal sending circuit in the base unit are operated by a local battery.