JPH03195241A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To improve the convenience of a cordless telephone set by disconnecting a telephone line and an internal circuit of a master set in the case of the message mode so as to attain unidirectional message communication between slave sets by means of a reflected voice signal via a master set. CONSTITUTION:In the case of message communication from a slave set B to a slave set C, the operator of the slave set B being a sender operates an operation section 16 to set the mode into the message mode. Thus, when an operation signal is given to a control section 15 of the slave set B, the control section 15 sends a control signal to a mute circuit section 17 to output a command signal to the slave set C and the master set A. The control section 8 of the master set A replies with a command signal and a signal loopback section 9 is operated and the preparation for the message communication to send the voice signal again is finished at the post-stage of the line connection section 3. Then the message communication is started from the slave set B to the slave set C.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cordless telephone equipped with one base unit and a plurality of handsets, and particularly relates to a method for transmitting information between the handsets by message communication. The present invention relates to cordless telephones that may enable.

(Prior Art) The cordless telephone shown in FIGS. 4 and 5 has conventionally been used as a parent-child type cordless telephone equipped with a base unit connected to a subscriber's telephone line and a plurality of handsets wirelessly connected to the base unit. Telephones are known.

In FIG. 4, it is an IAε base unit, and a connection terminal 1 connected to a subscriber's telephone line (not shown) has a calling signal detection unit 2 that detects a calling signal (incoming call signal) from the subscriber's telephone line. is connected. In addition, the connection terminal 1 has two
A line connection section 3 is connected to the line-type subscriber telephone line and a four-wire internal circuit. , - is connected to the output of the line connection section 3 of the transmitter section 4 equipped with a modulation circuit for wirelessly transmitting a calling signal (tone ringer) to each handset IB and IC. Also, connected to the input of the line connection section 3 is a reception section 5 equipped with a demodulation circuit for demodulating radio waves sent from each handset IB and IC into various signals.

The output of the transmitting section 4 and the input of the receiving section 5 are connected to a combining/distributing section 6 that combines and distributes the transmitted signal and the received signal so that one antenna can be used for both transmission and reception. 7 is an antenna connected to the coupling/distributing section 6. In addition, 8 is a control section, which controls the line connection section 3, transmission section 4, and reception section 5 based on command signals from each slave unit IB and IC.
It is designed to send control signals to, etc., to control the operation of each part.

Further, in FIG. 5, IB is a slave unit, and its antenna 10 is connected to a distribution/coupling unit 11 that distributes and couples the transmitted signal and the received signal in order to use this one antenna for both transmission and reception. .

The output of this distribution/coupling section 11 includes the base unit I.
A receiving section 12 equipped with a demodulation circuit for demodulating radio waves from A into various signals is connected.

Furthermore, a transmitter 13 equipped with a modulation circuit that modulates various signals is connected to the input of the distribution/combiner 11. Further, the output of the receiving section 12 and the input of the transmitting section 13 are connected to a handset section 1 which includes a transmitter and a handset for making a telephone call.
4 terminals. Note that 15 is a control section, which controls the reception section 12 and the transmission section 1 based on various command signals from the parent aIA and operation signals from the operation section 16.
3 and the handset/receiver section 14, etc., and the base unit IA
It is designed to control the operation of each part of the system. In addition, the operation unit 16 switches between a call mode with the base unit IA and a message mode for making a message (one-way) call with another handset IC by an input operation by the operator, and outputs respective operation signals. It looks like this.

FIG. 6 is a diagram illustrating an outline of a communication path of a cordless telephone.

In the figure, the connection terminal 1 to which the subscriber telephone line is connected is connected to one side of the internal circuit 1a of the main unit IA, and the transmission output terminal 18 and the reception input terminal 19 (
However, it is not shown in FIG. ) are connected to each other. The transmission output end 18 and the reception input end 19 are connected to the antenna 7.

On the other hand, the reception input terminal 2 is connected to one side of the internal circuit 1b of the slave unit IB.
0 and a transmitting output terminal 21 (not shown in FIG. 5) are connected, and a receiving output terminal 22 and a transmitting terminal 23 (not shown in FIG. 5) are connected to the other side of the internal circuit 1b. (not shown) are connected to each other. The receiving output terminal 22 and the transmitting terminal 23 are connected to the antenna 10. Note that the basic configuration of the handset IC is the same as that of the handset IB, so a detailed explanation will be omitted.

In this cordless telephone, when the operating section 16 of the handset IB is operated, a wireless communication path is formed between the parent and child telephones. In this case, the transmission frequency band (
Since the receiving frequency band of the handset IB and the receiving frequency band of the base IA (the transmitting frequency band of the handset IB) are set in advance to be different,
Two-way communication is possible with the handset IB of the machine. Therefore, when a call is received from the subscriber's telephone line to base unit IA, as shown in FIG. Sent out. Then, this call signal is sent to the reception input terminal 2 of the handset IB.
0 to a speaker (not shown) via the internal circuit 1b, a ring tone sounds to notify the operator of the handset IB of the incoming call.

At this time, when the handset IB side goes off-hook, the base unit IA and the handset IB are connected wirelessly, so that it is possible to talk to other telephone subscribers via the base unit IA.

(Problem to be Solved by the Invention) However, in this type of cordless telephone, since the transmitting and receiving frequency band of the wireless link between the parent and child phones is specified as described above, the number of connections between the base unit IA and one handset IB is limited. As a general rule, two-way telephone calls are used; for example, handset IB, I
Direct communication between C and C was not possible. In other words, 1:N where there are multiple handsets for one wireless communication path.
In this type of cordless telephone, it was not possible to make calls between the handset IB and IC via the base unit IA because the wireless communication channel was legally regulated. .

The present invention has been made in view of the above-mentioned problems, and its purpose is to enable information transmission by message communication between multiple handsets in a cordless telephone in which the wireless communication path between the parent and child phones is one channel. Our goal is to provide cordless telephones that can

(Means for Solving the Problems) In order to solve the above problems, a cordless telephone of the present invention includes a base unit connected to a telephone line and a plurality of handsets wirelessly connected to the base unit. On each of the slave units,
an operating section for switching between a call mode in which a call is made with a subscriber's phone via the base unit and a message mode in which a one-way message call is made between the slave units; and a control signal and a A control section that outputs a command signal, and a mute circuit section that operates based on the control signal from the control section and reduces or eliminates the listening volume or the sending volume during a message call between handsets, and the mute circuit section is provided. On the base unit side, there is a control unit that outputs a control signal based on the command signal from the slave unit, and in response to the control signal from this control unit, the signal sent from the slave unit on the transmitting side is returned to the receiving side. A signal return section is provided for retransmitting the signal to the slave device.

(Function) In the case of a call between parent and child telephones, the line connection section connects the subscriber's telephone line and the internal circuit.

When a call is received from the subscriber's telephone line to the base unit in this state, the control section of the base unit is activated and a calling signal is sent to the slave unit. Then, when this calling signal is received on the handset side,
A ringing signal is generated to notify the handset operator of the incoming call. At this time, when the handset is off-hook and the operation unit is switched to the call mode, the handset and the base unit are wirelessly connected, and it becomes possible to talk between the handset and another subscriber's phone.

Next, when a call is to be made between handsets, the operator of the handset who wishes to send a message first goes off-hook when making a call and switches the operating section to message mode. Then, a control signal is output from the control unit to the transmitting side slave unit, and a command signal is sent to each of the base unit and the receiving side slave unit. In accordance with this, the mute circuit section of the transmitting side handset is operated by the control signal, and the receiving side is muted. Further, in response to the command signal, the receiving handset is connected to the same frequency channel as the frequency used for communication between the base unit and the transmitting handset, and is further muted on the transmitting side of the muting circuit section.

Then, in response to the command signal, the base unit activates the signal return unit and completes preparations for the message call.

After this, when a message is sent from the transmitting handset, the audio signal received by the base unit is looped back by the signal return unit and retransmitted to the receiving handset, so the handset that is on the same wireless channel Both are in a state of monitor reception. At this time, in the transmitting handset, the content of the message is returned as sidetone via the receiving section, but due to the muting of the receiving side in the mute circuit section,
Sidetones are reduced or eliminated. On the other hand, on the receiving handset, noise such as room noise that is input to the transmitter while receiving a call may be returned to the handset as sidetone. reduced or eliminated. Therefore, when a one-way communication path is formed between the transmitting side handset and the receiving side handset, there is almost no influence of sidetone, so clear message calls can be made.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the electrical configuration of a base unit of a cordless telephone according to the present invention, and FIG. 2 is a block diagram showing the electrical configuration of a cordless phone unit.

Note that in FIGS. 1 and 2, the same parts corresponding to the above-described FIGS. 3 and 4 are given the same reference numerals, and redundant explanation will be omitted.

The base unit A according to this embodiment is configured by interposing a signal return unit 9 between the line connection unit 3 shown in FIG. 4, and the transmitting unit 4 and receiving unit 5. This signal return section 9 is operated by a control signal from the control section 8,
The audio signal transmitted from the handset B side is looped back and retransmitted to the handset C side.

Further, the handset B includes a receiving section 12 and a transmitting section 1 shown in FIG.
3 and the handset section 14. -1-Circuit part 1
7. This mute circuit section 17
operates based on a control signal from the control section 15, mutes the audio signal sent from the receiving section 12 to the handset section 14, and reduces or eliminates the listening volume. Furthermore, the audio signal sent from the handset section 14 to the transmitting section 13 can be muted to reduce or eliminate the voice volume.

The operation section 16 of each handset B, C is provided with a changeover switch (not shown) that can be selected to switch between a call mode and a message mode. Operational signals are provided that form a communication path between the telephones. On the other hand, when switching to the message mode, an operation signal (2) is output to form a communication path for one-way message communication between handsets.

FIG. 3 shows a schematic configuration of a communication path of a cordless telephone.

In the figure, A is the base unit, and B and C are slave units, which are connected to each terminal 1, 18° 19 connected to the internal circuit 1a of base unit A, and to the internal circuits 1b and Ic of each slave unit B and C. Each terminal 2
0 to 23 have the same basic configuration as the conventional example shown in FIG. 6 above. Therefore, 2. A detailed explanation will be omitted here. However, each terminal 18-23 is not shown in FIGS. 1 and 2.

Next, the first part about the operation of the cordless telephone with the above configuration will be explained.
This will be explained with reference to FIGS. 3 to 3.

(2) In the case of a call between parent and child phones, first, the operator switches the operating section 16 of handset B to set it to call mode. As a result, when an operation signal is given to the control unit 15 of the slave unit B, a command signal is output from the control unit 15.

This command signal is given to the control unit 8 of the base unit A from the transmitting unit 13, distribution/coupling unit 11, and antenna 10 via the antenna 7 on the base unit A side, the coupling/distribution unit 6, and the receiving unit 5. This control unit 8 outputs a control signal in response to a command signal,
It is sent to the line connection section 3.

When the line connection section 3 is activated, the telephone line and the internal circuit 1b are connected and impedance matching is achieved. In this call mode, the control a signal is not sent to the mute circuit section 17 of the handset B, and therefore the mute circuit section 17 is kept in an inoperative state. When base unit A receives a call in this state, the calling signal detection section 2 detects the calling signal, and the calling signal is guided to the control section 8.

This signal is then given to the control section 15 via the transmitting section 4, the coupling/distributing section 6, the antenna 7, the antenna 10 of the handset B, the distributing/coupling section 11, and the receiving section 12. Then, the control unit 15 generates a ringing tone from a speaker (not shown) of the handset B connected to the receiving output terminal 22 to notify the operator of the incoming call. At this time, when the handset B is off-hook, the parent aA and the handset B are wirelessly connected, so that it becomes possible to talk to other subscriber telephones via the parent A.

■ In the case of a message call between handsets When making a message call from handset B to handset C, the operator of handset B, which is the sending side, first operates the operation unit 16 to switch to the message mode. Set to . As a result, when an operation signal is given to the control unit 15 of the slave iB, a control signal is output from the control unit 15 to the mute circuit unit 17, and at the same time, a control signal is output to the slave unit C and the base unit A. A command signal is output.

When the control signal is applied to the mute circuit section 17 of the handset B, the mute circuit section 17 is activated and the receiving side of the handset section 14 is muted.

Further, the command signal sent from the control unit 15 of the slave unit B is transmitted from the transmitting unit 13, the distribution/combining unit 11, and the antenna 10 to the antenna 10, the distribution/combining unit 11, and the receiving unit 1 of the slave unit C.
2 to the control unit 15 of the slave unit C. The control unit 15 connects the frequencies used for calls between the base unit A and the slave unit C on the same radio channel in response to the command signal.
In addition, the control section 15 outputs an operation control signal for preventing sidetone when receiving a message call to the mute circuit section 17.

As a result, a communication path between handset B and handset C is formed via base unit A, and mute circuit section 17 operates to mute the transmitter side of handset section 14.

Further, the command signal sent from the control unit 15 of the slave unit B is transmitted from the transmitting unit 13, the distribution/combining unit 11, and the antenna 10 to the antenna 7, the combining/distributing unit 6, and the receiving unit 5 of the base unit A. The information is given to the control unit 8 of the parent device A. In this control section 8, the signal return section 9 operates in response to the command signal, and preparations for a message call for retransmitting the voice signal at the subsequent stage of the line connection section 3 are completed.

Thereafter, the slave 11B starts a message call to the slave C. That is, when the operator makes a sound, this sound signal is transmitted from the transmitter of the handset/receiver section 14, the mute circuit section 17, the transmitting section 13, the distribution/coupling section 11, the antenna 10 to the antenna 7 of the main unit A, the coupling/coupling section The signal is guided to the signal return unit 9 via the distribution unit 6 and the reception unit 5. Then, the audio signal is retransmitted to the handset C side by loopback, and is transmitted from the transmitting section 4, combining/distributing section 6, and antenna 7 to the antenna 10 of the handset C, distributing/combining section 11, receiving section 12, and mute. It is led to the handset section 14 via the circuit section 17. This allows the child mC
In this case, the voice signal sent from handset B on the transmitting side is demodulated into a monitor state and can be extracted as voice, making it possible to make one-way message calls.

In this way, the audio signal from the transmitting handset B is retransmitted to the receiving handset C via the base unit A, but the audio signal is not needed in the transmitting handset B. It becomes a side tone.

However, at this time, the audio signal on the receiving side is reduced or eliminated by the operation of the mute circuit section 17, so that sidetone does not appear in the received audio.

On the other hand, in the handset C on the receiving side, noise such as letter sounds is input as sidetone to the transmitter of the handset/receiver unit 14 during reception, and this noise may be returned via the base unit A. However, at this time, the transmitting side is muted by the operation of the mute circuit section 17, so that the deterioration in clarity of the audio signal during reception is avoided. Therefore, in the handset C on the receiving side,
The message sent from handset B on the sending side can be clearly heard.

Note that the same procedure as described above is also applied when transmitting a message from the receiving side handset C to the transmitting side handset B.

Furthermore, by alternately and repeatedly transmitting data between handset B and handset C in this way, a two-way conversation of the Brestow talk type is possible.

(Effects of the Invention) The cordless telephone of the present invention connects the telephone line and the internal circuit of the base unit when set to the call mode, thereby enabling two-way communication between the subscriber's phone and the slave unit via the base unit. At the same time, when set to message mode, the telephone line and the internal circuit of the base unit are disconnected, and one-way message calls can be made between handsets by looping back voice signals via the base unit. Improved convenience. Also, during this message call, the message content of the sending handset is transmitted via the receiving unit,
Although this is returned as sidetone, by providing the mute circuit section 6, it is possible to reduce or eliminate the listening volume and avoid the influence of sidetone. On the other hand, while receiving a call, noise such as letter sounds may enter the handset as sidetone, but the mute circuit reduces or eliminates the transmission volume and prevents sidetone shadows. Another effect is that information can be transmitted at a clear volume at all times during a call.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a block diagram showing the electrical configuration of the base unit of the cordless telephone, and FIG. 2 is a block diagram showing the electrical configuration of the cordless handset. , 3rd
Figure 4 is a block diagram showing the electrical configuration of the base unit of a conventional cordless telephone, Figure 5 is a block diagram showing the electrical configuration of the cordless handset, and Figure 6 is a block diagram showing the electrical configuration of the base unit of a conventional cordless telephone. FIG. A, IA...Base unit B, IB, C, IC...Slave unit 3...Line connection section 8...Control section 9...Signal return section 15...Control section 16... Operation section 17... Mute circuit section 3 Fig. 0 1 C Fig. 6 7

Claims (1)

[Scope of Claims] 1) A cordless telephone comprising a base unit connected to a telephone line and a plurality of slave units wirelessly connected to the base unit, wherein each of the slave units includes the base unit. an operating section for switching between a call mode in which a call is made to a subscriber's phone via the terminal and a message mode in which a one-way message call is made between handsets; and a control signal and a command signal in response to the operation of this operating section. A control unit for outputting the output, and a mute circuit unit that operates based on a control signal from the control unit and reduces or eliminates the listening volume or the sending volume during a message call between the slave units, and the base unit side a control section that outputs a control signal based on a command signal from the slave device; and a control section that outputs a control signal based on a command signal from the slave device; A cordless telephone characterized in that it is provided with a signal return unit that retransmits signals.