JPH10136458A - Cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To report the end of speaking to another hand set when there is a call request from the other hand set during speaking at one hand set and that speaking is finished by providing the hand set with a means for reporting the end of speaking when a call end signal from a base unit is detected. SOLUTION: Even when a call request signal is transmitted through a control channel by operating a speak key at the other hand set during speaking at a hand set 2A, the base unit is connected with the hand set 2A by a speech channel so that any call request signal can not be received from the other hand set. Therefore, the other hand set judges no response and sets a flag to '1'. When the speaking end signal from the base unit is received while this flag is '1', a control circuit 20 at the other hand set in the same configuration as the hand set 2A outputs prescribed tones by driving a speaker 18 for 5 seconds. Thus, the end of speaking at the hand set 2A can be known at the other hand set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone device in which a plurality of slave units can be connected to one master unit.

[0002]

2. Description of the Related Art In recent years, a so-called multi-child type cordless telephone device in which a plurality of child devices can be connected to a single parent device has become widespread (for example, see Japanese Patent Publication No. Sho 62-55333). In this cordless telephone device, a base unit is provided with two wireless circuits, and a call between slave units is enabled through the base unit. A plurality of child units are provided by providing only one wireless circuit in the base unit. Among the devices, there is a type that can be wirelessly connected to one child device, but the latter type is currently the mainstream.

[0003]

In such a type, when one of the slave units is wirelessly connected to the master unit, the wireless communication of the master unit is performed even if the other slave unit makes a connection request to the master unit. Since there is only one circuit, the master unit cannot detect this connection request. (The master unit is connected to one of the slave units via the communication channel, whereas the connection request from the slave unit is different from that. This is performed on a control channel which is a channel). Therefore, the master unit ends the call of one slave unit,
Even if it returns to the reception standby state, it cannot detect that a call request has been made from the other handset during a call, so that it was not possible to notify the other handset of the end of the call.

[0004]

According to the cordless telephone apparatus of the present invention, the base unit is provided with a means for transmitting a signal indicating that the call of the slave unit has been completed. After a call request is made, a means for notifying the end of the call when a call end signal from the master unit is detected is provided.

[0005]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a cordless telephone according to the present invention. (1) is a master unit connected to the telephone line (L), (2A), (2B) and (3C) are master units (1). It is a slave unit connected wirelessly.

FIG. 2 shows a block diagram of the master unit (1).
A receiving circuit (3) demodulates a signal received from the antenna (4), and among the demodulated signals, an audio signal is supplied to a hybrid circuit (5), and a control signal is supplied to a control circuit (9) described later. . The hybrid circuit (5) performs two-wire to four-wire conversion and is connected to a telephone line (L) via a line connection circuit (6) for releasing and closing a line. (7) is a transmission circuit, which converts a voice signal input via the telephone line (L) and the hybrid circuit (5) and a control signal from the control circuit (9) into slave units (2A) (2B) (2C).
Is configured to be transmitted to. (8) is an incoming call detection circuit for detecting an incoming call, and (9) is a control circuit composed of a microprocessor, which sends and receives data to and from the RAM (11) according to a program stored in the ROM (10). Control.

FIG. 3 is a block diagram of the slave unit (2A). A receiving circuit (12) receives and demodulates a signal from the master unit (1), and outputs a control signal and an audio signal separately.
(13) is an amplifier for amplifying the audio signal from the receiving circuit (12) and supplying the amplified signal to the speaker (14). (15) is a transmitting circuit, and the audio signal and the audio signal input via the microphone (16) and the amplifier (17). It is configured to transmit a control signal from a control circuit (20) to be described later to the parent device (1). (18) is a speaker that outputs a ringing tone when receiving a call;
(19) is a key circuit including a numeric keypad, a call key, an end key, etc., and (20) is a control circuit composed of a microprocessor, according to a program stored in a ROM (21).
It exchanges data with the RAM (22) and controls each circuit.

The other slave units (2B) and (2C) have the same configuration as the slave unit (2A) described above, and a description thereof will be omitted.

FIG. 4 is a flowchart showing a main part program written in the ROM (10) of the master unit (1).
Shows a flowchart showing a main part program written in the ROM (21) of the slave units (2A), (2B) and (2C), and the operation will be described based on the flowchart.

First, the control circuit (20) of the slave units (2A), (2B) and (2C) sets a flag to 0 in the initial setting, and outputs one of the control signals from the master unit (1) via the control channel. (B1, 2, 5) whether a call termination signal has been received and whether a call key has been operated.
The master unit (1) is connected to the slave unit (2) through the control channel.
A) It is monitored whether or not a call request signal, which is one of the control signals from (2B) and (2C), has been received (S1). Here, when the call key is operated in the handset (2A), the control circuit (20) of the handset (2A) generates a call request signal and controls the transmission circuit (15) to transmit the signal by a control channel. Control (B6). When the master unit (1) receives the call request signal via the control channel, the control circuit (9) generates a control signal indicating the use call channel, and controls the transmission circuit (4) to transmit the control signal via the control channel. After that, the channels of the transmission circuit (4) and the reception circuit (3) are switched to the designated communication channel, and the line connection circuit (6) is controlled to connect the telephone line (L) (S2-4). The control circuit (2) of the child device (2A) receiving the instruction of the used communication channel from the parent device (1)
0) sets the flag to 0 (although it is already set to 0 here, it is set to 0 again for processing), and the transmission circuit (1
5) and the channel of the receiving circuit (12) is switched to the communication channel (B7, 8, 10). This allows
The slave unit (2A) is connected to the telephone line (L) via the communication channel.
Will be connected. In this state, when a telephone number is input using the numeric keypad of the child device (2A), the telephone number data is transmitted to the parent device (1) (call mode processing) (B1).
1), control circuit (20) of master unit (1) receiving this
Means that the line connection circuit (6) is controlled based on the telephone number data to transmit a pulse dial signal to the telephone line (L) (call mode processing) (S5). Can be.

When the call is ended and the end key of the handset (2A) is operated, the control circuit (20) of the handset (2A) generates a call end request signal and transmits it via the call channel. After controlling the transmission circuit (15), the operation returns to the reception standby state (B12, B13).

The control circuit (9) of the master unit (1) receives the call termination request signal via the call channel.
Releases the telephone line (L), generates a call end signal, controls the transmission circuit (4) to transmit the signal via the control channel, and returns to the reception standby state (B7,
8).

As described above, even if the call key of the other handset (2B) is operated and the call request signal is transmitted via the control channel while the handset (2A) is in a call, the master can be used. Since the device (1) is connected to the child device (2A) via the communication channel, it cannot receive a call request signal from another child device (2B). Therefore, the other handset (2B) determines that there is no response in the process of step (B7),
The flag is set to 1 (B9). When this flag is 1 and a call end signal is received from the master unit (1), the control circuit (20) of the other slave unit (2B) drives the speaker (18) for 5 seconds to generate a predetermined sound. Output (B2-4). Thereby, it is possible to know that the telephone conversation with the slave unit (2A) has been completed. In addition, after hearing the end notification, another slave unit (2B)
When a call request is made again and there is a response from the master unit (1), the flag is set to 0 again, and the speaker (1) is set even if a call end signal is transmitted from the master unit (1).
8) is not driven (B7, 8).

[0015]

Since the present invention is constructed as described above, when one of the slave units receives a call request while the other slave unit is in a call, the other unit ends the call when the other unit ends the call. Can be notified that the call has ended.

[Brief description of the drawings]

FIG. 1 is a block diagram of a cordless telephone device according to the present invention.

FIG. 2 is a block diagram of a base unit of the cordless telephone device according to the present invention.

FIG. 3 is a block diagram of a slave unit of the cordless telephone device of the present invention.

FIG. 4 is a flowchart of a program of a main part of a base unit of the cordless telephone device of the present invention.

FIG. 5 is a flowchart of a program of a main part of a cordless handset of the cordless telephone device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 master unit 2A slave unit 2B slave unit 2C slave unit 9 control circuit (master unit) 20 control circuit (master unit)

Claims (1)

[Claims] In a cordless telephone device including a base unit connected to a telephone line and a plurality of slave units wirelessly connected to the master unit, the call of the slave unit to the master unit is terminated. Means for transmitting a signal instructing that a call is made, and after making a call request during a call with another slave, a means for notifying the end of the call when a call end signal from the master is detected is provided. A cordless telephone device characterized by the following.