JPH08214048A - Cordless telephone set - Google Patents

Abstract

PURPOSE: To prevent a speech from being accidentally interrupted when a slave set takes over the speech from a conventional telephone set by detecting the connection of the conventional telephone set to inhibit automatic restoration of the slave set to the speech state into a standby state. CONSTITUTION: When a master set 3 uses a voltage detection circuit 9 to detect connection of a conventional telephone set 2 to a telephone line L and when a dial key of a slave set 4 in radio channel connection set to a speech state via a control circuit 10 and a transmission circuit 8 is not operated for a prescribed time, the automatic restoration of the slave set 2 to the standby state is inhibited. Thus, when the slave set 4 takes over a speech from the telephone set 2, accidental interruption of the speech is surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system including a base unit and a handset.

[0002]

2. Description of the Related Art In recent years, cordless telephone devices have been remarkably spread, and one device has been installed in each home.

By the way, in the above cordless telephone device, for example, as disclosed in Japanese Utility Model Laid-Open No. 1-105236, the cordless handset is detached from the charger and the call is started (call request signal from the cordless handset). Is sent to the base unit and the phone line is closed on the base unit), and if there is no input from the numeric keypad for a predetermined time, the handset automatically enters the standby state (the end signal is sent from the handset). It is transmitted and set to the state where the telephone line is opened in the master unit. This is to prevent this when the mobile phone is set to the call start state due to an erroneous operation by the user, and the busy state continues.

[0004]

Therefore, in the above configuration, when another telephone device is connected to the same telephone line and is used in the form of a cordless telephone device and a so-called parent-child telephone, once an incoming call is received. If you answer with another telephone device, then set the cordless telephone device's cordless handset to the call start state and put the other telephone device on hook, this cordless handset enters the call with the other party without operating the numeric keypad. After a lapse of time, it automatically goes into a standby state, and the user suddenly feels that the call has been disconnected.

[0005]

A cordless telephone device of the present invention comprises a master unit connected to a telephone line and a slave unit wirelessly connected to the master unit, and the slave unit is an external line via the master unit. Use of another telephone device connected to the telephone line as the base unit when connected to the main unit and setting the slave unit to the standby state when at least the dial keys are not operated within the predetermined time from the call start operation. When the means for detecting the state and the detection means detect that another telephone device is in use, when a call start operation of the handset is detected, a signal indicating that the handset is in use is sent to the handset. It is characterized in that means for transmitting is provided, and means for prohibiting the transition to the standby state based on the reception of a signal indicating that it is in use from the parent device is provided in the child device.

[0006]

Since the present invention is configured as described above, when the handset is set to the call state, if the other telephone device is in use, the handset automatically returns to the standby state. It is forbidden.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram when the cordless telephone device (1) and the general telephone (2) of the present invention are connected to the same telephone line (L). The cordless telephone device (1) is connected to the telephone line (L). It comprises a master unit (3) to be connected and a slave unit (4) wirelessly connected to the master unit (3).

FIG. 2 shows a block diagram of the master unit of the present invention, in which (5) is a network circuit connected to the telephone line (L) and also includes a connection circuit for the telephone line (L).
(6) is a dial transmission circuit for outputting a tone or pulse dial signal to the telephone line (L) through the network circuit (5), and (7) is for demodulating the received signal, and through the network circuit (5). A receiving circuit for outputting to the telephone line (L), and a transmitting circuit (8) for modulating a signal inputted from the telephone line (L) via the network circuit (5) and transmitting it to the slave unit (4). Reference numeral (9) is a voltage detection circuit that detects the voltage of the telephone line (L) and outputs a detection signal when the voltage becomes a predetermined value or less. By the way, a voltage of 48 V is applied to the telephone line, and the general telephone (2) can perform the basic operation by the power supply. Thus, ordinary telephone (2)
When off-hook and current flows to the side of the ordinary telephone (2), the line voltage is reduced due to the voltage division due to the resistance of the telephone line (L) itself and the internal resistance of the ordinary telephone (2). By detecting the line voltage by the detection circuit (9), it is possible to determine whether the general telephone (2) is on-hook or off-hook. Further, the voltage detection circuit (9) sets the input resistance so that a current that does not affect the exchange flows.

Reference numeral (10) is a control circuit composed of a microprocessor for controlling each circuit of the master unit (3).

FIG. 3 shows a block diagram of a slave unit according to the present invention. (11) is a receiving circuit for receiving a signal from the master unit (3), and (12) is a demodulated signal from the receiving circuit (11). It is a speaker that reproduces through an amplifier (13). (14)
Is a transmission circuit that modulates a signal input from the microphone (16) via the amplifier (15) and transmits the signal to the master unit (3). The master circuit also modulates a control signal from a control circuit (25) described later. Send to 3). (17) is a bell for notifying an incoming call, (18) is a call key (19), an end call key (2
0) and a numeric keypad (21). (2
2) (22) is a charging terminal for charging the battery (23) by contacting the charging terminal of this charger when placed on a charger (not shown), and (24) detects whether or not charging is in progress The charging detection circuit for outputting an H level signal during charging, and outputs an L level signal when not charging. Reference numeral (25) is a control circuit which is composed of a microprocessor and controls each circuit of the slave unit (4).

Next, FIG. 4 and FIG. 5 are flow charts of a program of a main part relating to the transmission processing written in the control circuits (10) and (25) of the master unit (3) and the slave unit (4) of the present invention. The operation will be described based on this.

First, in the control circuit (10) of the slave unit (4), whether the call key (19) has been operated, or whether the slave unit (4) has been lifted from the charger (charging). Whether or not the output of the detection circuit (24) has changed from H level to L level is monitored (C1, 2). If the child device (4) is lifted from the charger, the control circuit (25) of the child device (4) transmits a line connection request signal to the parent device (3) (C2, 3). Upon receiving the line connection request signal, the control circuit (10) of the master unit (3) detects the voltage level of the telephone line (L) and determines whether or not the general telephone (2) is off-hook, that is, the general telephone ( It is determined whether or not 2) is in a call (S1, 2). If it is determined that the call is in progress, the call signal is transmitted, and if it is determined that the call is not in use, the call signal is not transmitted (S3). Then, after this, the control circuit (10) of the base unit (3) closes the telephone line (L) (S4). When the telephone line (L) is closed, a dial tone signal from the telephone line (L) is transmitted to the slave unit (2) via the master unit (3) and the speaker (1) of this slave unit (4) is transmitted.
Played in 2).

When the call signal is not transmitted from the master unit (3), the control circuit (25) of the slave unit (4) activates the built-in timer and then dials the numeric keypad (21). You will have to wait (C5, 6).

If there is no dial input by the ten-key (21) before the timer counts 10 seconds, the control circuit (25) sends an end signal to the master unit (3),
The standby state (the state in which the power supply to the transmission circuit (14) is cut off) is set (C7 to 9). The control circuit (10) of the master unit (3) that receives the call end signal sets the standby state after opening the telephone line (L) (S5 to S7).

When the dial input is made by the ten-key (21) within 10 seconds, the control circuit (2) of the slave unit (4) is
5) is a numeric keypad (21) operated after clearing the timer
Send the dial data of the number corresponding to (C6, 1
0, 11). After that, when the dial input is further made by the ten key (21), the dial data of the number corresponding to the operated ten key (21) is transmitted in the same manner as described above (C13, 14). Then, when all the telephone numbers of the other party are input and the conversion processing is performed at the telephone office, the other party is called, and if the other party answers, the call can be made. In this state,
When the call end key (20) of the handset (4) is operated and detected by the control circuit (25) of the handset (4), it sends a call end signal to the base unit (3) and then enters the standby state. Set (C1
5, 8 and 9), and the control circuit (10) of the parent device (3) which received the call end signal, carries out steps S6 and 7 as described above.
Will be performed (S5).

When a call signal is received in step C4, the control circuit (10) of the child device (3) immediately moves to step C13 without operating the built-in timer. That is, when the handset (4) is lifted from the charger and the general telephone (2) is in the on-hook state, the handset (4) automatically returns to the standby state if there is no dial input for 10 seconds. If the telephone set (2) is in the off-hook state, such automatic shift to the standby state is prohibited. This is to prevent the call from being cut off abruptly when the call is made to the handset (4) while the call is made to the general telephone (2).

Next, for example, when the slave unit (4) is in a standby state without being mounted on the charger,
A call cannot be made unless the call key (19) is operated. At this time, the control circuit (25) of the slave unit (4) transmits a line connection request signal to the master unit (3) and shifts to step C12 described above (C1, 12). That is, the call key (1
In the case of the operation of 9), since at least the user has the operation intention, the automatic return to the standby state is not performed.

[0018]

Since the present invention is configured as described above, when another telephone device is in use when the cordless handset is set to the call state, the cordless handset is automatically set to the standby state. Therefore, when the call of another telephone device is inherited by the handset, this call can be prevented from being abruptly cut off.

[Brief description of drawings]

FIG. 1 is a block diagram when a general telephone is connected to a telephone line of a cordless telephone device of the present invention.

FIG. 2 is a block diagram of a master unit of the present invention.

FIG. 3 is a block diagram of a child device of the present invention.

FIG. 4 is a flowchart of a main part relating to a call origination process written in a control circuit of a master unit according to the present invention.

FIG. 5 is a flowchart of a main part relating to a calling process written in a control circuit of a slave according to the present invention.

[Explanation of symbols]

 1 cordless telephone device 2 general telephone 3 parent device 4 slave device 9 voltage detection circuit 10 control circuit 25 control circuit

Claims (1)

[Claims] 1. A master unit connected to a telephone line, and a slave unit wirelessly connected to the master unit. The slave unit is connected to an outside line via the master unit, and the slave unit is used for a call. In the one that sets the standby state when at least the dial keys are not operated within the predetermined time from the start operation,
When the base unit detects a use state of another telephone device connected to the telephone line, and the detection unit detects that the other telephone device is in use, When a call start operation is detected, a means for transmitting a signal indicating that the call is in use to the slave unit is provided, and the slave unit stands by based on the reception of the signal indicating that the call is in use from the master unit. A cordless telephone device provided with means for prohibiting a transition to a state.