JP3053695B2 - Loudspeaker cordless telephone - Google Patents

Abstract

PURPOSE:To prevent so-called loss of speech head by eliminating circuit components of a voice switch such as a solid-state switch, a level detector and a band pass filter. CONSTITUTION:The device is provided with a master set radio transmission circuit 5 and a master set radio reception circuit 11 sending / receiving a carrier modulated by an outgoing, incoming extension/external line voice signal and a channel acquisition/open control signal, and with a slave set radio reception circuit 28 receiving a carrier modulated by an outgoing, incoming extension/ external line voice signal and a channel acquisition/open control signal, A slave set control signal transmission circuit 27 sends a control signal in response to the received channel acquisition/open control signal to secure a talking channel. The incoming extension voice signal takes precedence over other signals in the talking. When a talk switch FK1 is depressed, the incoming extension voice signal is interrupted and the outgoing extension voice signal takes precedence over the incoming extension voice signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker-type cordless communication device, and more particularly to a cordless base unit provided with a down voice signal transmitted from a base unit microphone of the cordless base unit to a slave unit speaker of the cordless base unit. The present invention relates to a press-talk type loudspeaker-type cordless communication device that can be connected / disconnected by a talk switch.

[0002]

2. Description of the Prior Art As shown in FIG.
3. Cordless master unit 41 including master unit speaker 42, slave unit call switch 44, extension response switch 45, and cordless master unit antenna 41a, slave unit microphone 53, slave unit speaker 52, numeric keypad 54, master unit call switch 55 , A cordless handset 51 having an extension response switch 56 and a cordless handset antenna 51a. The handset call switch 44, the extension response switch 45, the parent device call switch 55, and the extension response switch 56 are pushbutton switches with a display function provided with a light emitting diode on a key top.

The cordless base unit 41 is equipped with a power plug 46 and a modular plug 48 to which a telephone cord 47 is connected, and the cordless base unit 51 is freely charged when placed on a dedicated charging stand 57 provided with a power plug 59. The charging lamp 58 indicates that charging is completed.

The cordless parent device 41 to the cordless child device 5
In the case of an extension call for calling 1, the slave unit call switch 44 of the cordless master unit 41 is pressed. When the cordless handset switch 44 of the cordless master unit 41 is pressed, the cordless slave unit 51 is pressed.
A ringing tone is transmitted from the child device speaker 52, and at the same time, the light emitting diode provided at the key top of the extension response switch 56 blinks. Extension response switch 5 of cordless handset 51
When the button 6 is depressed, the blinking light-emitting diode is turned on, and the communication path between the cordless parent device 41 and the cordless child device 51 is completed. The upstream audio signal f2 transmitted via the antenna 51a is transmitted to the parent device speaker 42 via the cordless parent device antenna 41a of the cordless parent device 41.
In addition, the downstream audio signal f1 output from the base unit microphone 43
Is transmitted to the child device speaker 52 through the same route.

[0005] The cordless child device 51 to the cordless parent device 4
In the case of an extension call for calling 1, the main unit call switch 55 of the cordless slave unit 51 is pressed. When the parent device call switch 55 of the cordless child device 51 is pressed, the cordless parent device 41 is pressed.
A ringing tone is transmitted from the parent device speaker 42, and at the same time, the light emitting diode provided at the key top of the extension response switch 45 blinks. Extension response switch 4 of cordless base unit 41
When 5 is depressed, the blinking light emitting diode is turned on, and the communication path between the cordless master unit 41 and the cordless slave unit 51 is completed.
Are transmitted and received on the same route as in the case of an extension call for calling up and down.

The numeric keypad 54 of the cordless child device 51
Is operated, an outside-line call can be made via the modular plug 48 provided in the cordless master unit 41.

[0007] In the loudspeaker-type cordless telephone apparatus having the above-described structure, when the cordless master unit 41 calls the cordless slave unit 51,
Unless the answer key or the like is operated by the cordless handset 51, the communication path is not completed. In addition, since the cordless handset 51 is not of the loudspeaker type, there is a drawback in that it is necessary to hold the cordless handset 51 in a hand and talk. If the cordless handset 51 is of the loudspeaker type, a voice switch must be provided. The provision of the voice switch has disadvantages such as the necessity of providing circuit elements such as a solid state switch, a level detector, and a band-pass filter which constitute the voice switch, and a program for controlling these circuit elements.

The communication levels of the upstream and downstream audio signals f2 and f1 are determined by the shape of the audio equipment such as the parent device microphone 43, the parent device speaker 42, the child device microphone 53, and the child device speaker 52, and the housing on which the audio device is mounted. In addition, since it is affected by acoustic coupling between acoustic devices, environmental noise, and the like, even if a voice switch that satisfies complicated design conditions is provided, there is a problem that a so-called head-cut phenomenon is caused.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned disadvantages. By providing a talk switch, circuit elements such as a solid-state switch, a level detector, and a band-pass filter constituting a voice switch are not required. An object of the present invention is to provide a loudspeaker-type cordless communication device capable of preventing a disconnection phenomenon.

[0010]

SUMMARY OF THE INVENTION To achieve this object, a loudspeaker-type cordless communication apparatus according to the present invention uses a channel which captures a carrier modulated by a downstream and upstream voice signal and a control signal. In a loudspeaker-type cordless communication device provided with a cordless base unit and a cordless slave unit for transmitting and receiving, and intercommunicating with each other, the cordless base unit includes a down link and an up extension.
A base station wireless transmission circuit and a base station wireless reception circuit for transmitting and receiving a carrier modulated by an external line audio signal and a channel capture / opening control signal are provided.
A slave radio receiving circuit for receiving a carrier modulated by an external line audio signal and a channel capture / opening control signal; a receiving amplifier connected to the slave radio receiving circuit for transmitting a down extension / external line audio signal to a slave speaker; A slave unit control signal transmission circuit connected to the slave unit wireless reception circuit and transmitting a control signal in accordance with the received channel capture / release control signal; a control signal and a slave unit output from the slave unit control signal transmission circuit A cordless base unit for transmitting an up sound signal output from the microphone, wherein the cordless base unit transmits the up sound signal transmitted from the sub unit microphone to the cordless base unit via the slave unit wireless transmission circuit. A talk switch that cuts off and transmits a downstream extension voice signal to the cordless handset, and a transmission mute circuit and a reception mute circuit that are opened and closed according to the operation of the talk switch, respectively. It is provided.

[0011]

In this loudspeaker-type cordless communication device, a carrier modulated by a down-link and up-link internal / external voice signal and a channel capture / opening control signal is transmitted and received by a base unit radio transmission circuit and a base unit radio reception circuit. The slave unit wireless receiving circuit receives the carrier signal modulated by the downlink internal / external line voice signal and the channel capture / release control signal. A slave unit control signal transmission circuit transmits a control signal in accordance with the received channel capture / release control signal to secure a communication channel. In a call, an up-line extension voice signal is given priority. When the talk switch is depressed, the transmission mute circuit and the reception mute circuit are opened and closed, the upstream extension audio signal is cut off, and the downstream extension audio signal has priority.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a loudspeaker-type cordless telephone apparatus according to the present invention will be described in detail with reference to FIGS.

As shown in FIG. 1, the speaker system of the present invention has a cordless base unit 1 and a base unit microphone 2, a base unit speaker 14, a talk switch FK1, a call switch FK2, and a monitor / end switch. FK3, master unit antenna 1
6 is provided. Also, the cordless handset 21 is connected to the cordless handset 21.
2. A slave speaker 30 and a call / answer switch FK4 are provided.

The call / answer switch FK4 is a push button switch with a display function provided with a light emitting diode on a key top.

The cordless base unit 1 is equipped with a power plug 19 and a modular plug 18 to which a telephone cord 17 is connected. When the cordless handset 21 is placed on a dedicated charging stand 37 provided with a power plug 39, it is freely charged. The charging operation is indicated by a charging lamp 38.

As shown in FIG. 2, the cordless base unit 1
Base unit microphone 2, transmission amplifier 3, transmission mute circuit SS,
Base unit radio transmission circuit 5, transmission / reception demultiplexer 6, external line interface 7, telephone circuit 8, control signal transmission circuit 9, ringing tone generation circuit 10, base unit radio reception circuit 11, reception amplifier 12,
Reception mute circuit SR, parent device speaker 14, control signal reception circuit 15, talk switch FK1, call switch FK
2. A monitor / end switch FK3, a master CPU 20 and a master antenna 16 are provided. In addition, the cordless child device 21
In addition, slave unit microphone 22, transmission amplifier 23, slave unit wireless transmission circuit 24, transmission / reception duplexer 25, ringing tone generation circuit 26, control signal transmission circuit 27, slave unit wireless reception circuit 28, reception amplifier 29, slave unit speaker 30, a control signal receiving circuit 31, a carrier sense circuit 32, a call / answer switch FK4, a slave unit antenna 36, and a slave unit CPU 40 are provided.

The microphone 2 of the cordless master 1 is connected to the transmission mute circuit SS via the transmission amplifier 3, and the transmission mute circuit SS connects the master radio transmission circuit 5, the transmission / reception splitter 6, and the terminal 1a. It is connected to base unit antenna 16 via the main unit. The external line interface 7 for transmitting and receiving external line audio from the terminal 1b to which the external line L1 is connected is controlled by the base unit CPU 20 and connected to a telephone circuit 8 for outputting a downstream external line audio signal. Is connected to the input side of the transmission amplifier 3, and the input side of the telephone circuit 8 is connected to the output side of the reception amplifier 12.

Talk switch FK1, call switch FK
2. Monitor and call end switch FK3 and receiving radio circuit 11
Is connected to the master CPU.
20 is connected to the control input side, and the control output side of the base unit CPU 20 has a transmission mute circuit SS, a reception mute circuit SR,
The control signal transmitting circuit 9 is connected to the control input side of the ringing tone generating circuit 10. The receiving side of the transmission / reception branching filter 6 includes a base unit wireless receiving circuit 11, a receiving amplifier 12, and a receiving mute circuit S.
Connected to master speaker 14 via R.

The handset antenna 36 of the cordless handset 21 is connected to the terminal 21a, and the terminal 21a is connected to the transmission / reception duplexer 25.
Is connected to the slave unit wireless receiving circuit 28, the receiving amplifier 29, and the slave unit speaker 30. The output side of the handset wireless receiving circuit 28 is connected to the control signal receiving circuit 31 and the input side of the carrier sense circuit 32, and the output side of the control signal receiving circuit 31 and the carrier sense circuit 32 is connected to the call / answer switch F
K4 is connected to the control input side of the slave CPU 40 to which it is connected. The output sides of the ringing tone generation circuit 26 and the control signal transmission circuit 27 which are controlled by the slave unit CPU 40 are connected to the slave unit CPU.
40 is connected to the input side of the slave wireless transmission circuit 24 to which it is connected.

In the loudspeaker-type cordless telephone having the above-mentioned configuration, the down-stream radio wave f1 and the up-stream radio wave f2 composed of a carrier modulated by a voice signal and a control signal or an unmodulated carrier are transmitted to the base unit antenna 16 and the sub unit antenna 36. Send and receive between

The downlink radio wave f1 includes a voice signal of a downlink extension, a voice signal of a downlink outside, and a ringing signal of a downlink as voice signals, and a control signal includes a channel capture signal and a channel release signal. The uplink radio signal f2 is an audio signal as an audio signal,
There are an uplink external voice signal and an uplink ringing signal, and the control signals include an internal response signal and an external response signal.

The downstream extension audio signal uses the path between the main unit microphone 2 and the transmission amplifier 3, and the downstream external line audio signal uses the path between the external line interface 7 and the telephone circuit 8. Further, the modulated downstream ringing tone signal is transmitted directly from the ringing tone generating circuit 10 to the base station wireless transmission circuit 5. These downlink extension audio signals, downlink external audio signals, and downlink ringing tone signals are transmitted from the control signal transmission circuit 9 in response to the operation of the talk switch FK1, the ringing switch FK2, and the monitor / end switch FK3. Capture and release) and transmission mute circuit SS,
This is performed by the operation and recovery of the reception mute circuit SR.
Whether the monitor / end switch FK3 functions as a monitor or an end switch is determined by the master CPU 20.
Is determined by the control sequence according to.

The upstream extension / external line audio signal is transmitted to the slave unit microphone 2
2. In the path of the transmission amplifier 23 and the slave unit wireless transmission circuit 24,
The upward ringing tone signal is transmitted from the ringing tone generation circuit 26 under the control of the slave unit CPU 40 to the slave unit wireless transmission circuit 24.
When the call / answer switch FK4 is operated, a control signal (extension response...
External line response ... keyed response operation) is transmitted. The slave unit CPU 40 determines whether the control signal is an unkeyed internal line response or a keyed external line response.
Is determined by the control sequence of

When the call switch FK2 of the cordless master unit 1 is operated, the control signal transmitting circuit 9 operates under the control of the master unit CPU 20, and a control signal (capture) is transmitted from the master unit antenna 16 as a down radio wave f1. . This control signal (capture) is received by the slave unit antenna 36 and transmitted from the control signal receiving circuit 31 to the slave unit CPU 40. Slave unit CPU40
Determines that the control signal (capture) is an operation of the call switch FK2 of the cordless base unit 1, and returns a control signal (extension response) from the slave unit wireless transmission circuit 24 as an unkeyed extension response. The base station CPU 20 of the cordless base station 1 is
When a control signal (extension response) is received from the control unit 4, the control unit 10 controls the ringing tone generation circuit 10 to transmit a down ringing tone signal. This control sequence is performed several times. In this state, the transmission mute circuit SS is closed, and the reception mute circuit SR is open. The speaker 14 can listen to the upstream audio signal.

When the talk switch FK1 is operated, the transmission mute circuit SS is opened, the reception mute circuit SR is closed, and the downstream extension audio signal is transmitted prior to the upstream extension audio signal.

To end the call and release the captured channel, the monitor / end switch FK3 is operated. When the monitor / end switch FK3 is operated, a control signal (release) is transmitted from the control signal transmission circuit 9, and the captured channel is released.

When the channel is not captured between the cordless master 1 and the cordless slave 21, the talk switch FK
When 1 is operated, the transmission mute circuit SS is opened, the reception mute circuit SR is closed, and a downstream extension audio signal is transmitted. The transmission and reception of the control signal (capture) is the same as the operation of the call switch FK2, but in this case, the ringing tone generation circuit 10 is not controlled by the base unit CPU 20, so that the downlink ringing tone signal is not transmitted and the downlink extension voice signal is transmitted. Thus, the cordless handset 21 is called for.

When the cordless parent device 1 monitors the upstream external audio signal of the cordless child device 21, the monitor / end switch FK3 is operated. Monitor and end switch F
When K3 is operated, the transmission mute circuit SS is closed and the reception mute circuit SR is opened according to the control sequence, and the transmission is performed on the route of the slave microphone 22, the transmission amplifier 23, and the slave wireless transmission circuit 24 of the cordless slave 21. The extension audio signal can be monitored by the main unit microphone 2 of the cordless main unit 1.

When the cordless handset 21 is in a call with the cordless master 1, the cordless master 1 to the cordless handset 21
Alternatively, in order to transmit and receive a down ringing signal and an up ringing signal from the cordless handset 21 to the cordless master 1, the call switch FK2 of the cordless master 1 or the cordless slave 21 is used.
The call / answer switch FK4 is operated. When the paging switch FK2 is operated, a down ringing tone signal is transmitted, and when the paging / response switch FK4 is operated, a control signal (ringing) is made according to a control sequence and an up ringing tone signal is transmitted.

When an external call is received from the terminal 1b to which the external line L1 is connected, the telephone circuit 8 informs the base unit CPU 20 that the external call has been received. Base unit CPU 20 performs external line incoming call control, first sends out a control signal (external line incoming) from control signal transmitting circuit 9, and then sends out an external line incoming from ringing tone generating circuit 10. When the cordless handset 21 receives the control signal (incoming call from outside line), the light emitting diode provided on the key top of the call / answer switch FK4 flashes, and a ringing tone is transmitted from the handset speaker 30 via the receiving amplifier 29. .
When the call / response switch FK4 is pressed, the flashing of the light emitting diode turns on, and a control signal (external line response) is returned from the slave unit wireless transmission circuit 24. Master device CP of cordless master device 1
When U20 receives the control signal (outline response) from the handset wireless transmission circuit 24, U20 controls the telephone circuit 8. Under this control, the telephone circuit 8 performs the same operation as when the external line interface 7 is off-hook. When a ring trip occurs due to off-hook, an upstream outside line audio signal as an upstream radio wave f2 is transmitted to the telephone circuit 8 via the base unit wireless receiving circuit 11 and the receiving amplifier 12. Further, a down radio wave f1 as a down line external audio signal is transmitted from the base unit antenna 16 through a path of the telephone circuit 8, the transmission amplifier 3, the opened transmission mute circuit SS, and the base unit wireless transmission circuit 5. In this case, the reception mute circuit SR is open as in the monitor mode. The gain of the receiving amplifier 29 of the cordless handset 21 is controlled to a low level, and the telephone conversation is the same as that of a normal handset. Call and answer switch FK while light emitting diode is on
When 4 is pressed, the light emitting diode goes out and a control signal (outline end call) is transmitted from the slave unit wireless transmission circuit 24. The master CPU 20 of the cordless master 1 controls the telephone circuit 8 upon receiving a control signal (outline end call) from the slave wireless transmission circuit 24,
Perform on-hook operation.

In the above embodiment, the case of one cordless handset has been described, but the number of cordless handset is not limited to one.

Further, the present invention may be applied to a cordless telephone such as a handset type or a pocket type other than the loudspeaker type cordless telephone.

[0033]

As is apparent from the above description, according to the loudspeaker-type cordless communication apparatus of the present invention, the provision of the talk switch enables the solid-state switch, the level detector, the band-pass filter, etc., constituting the voice switch. Can be eliminated, and the so-called head-cut phenomenon can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a loudspeaker-type cordless telephone apparatus according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a loudspeaker-type cordless telephone apparatus according to the present invention.

FIG. 3 is a perspective view of a conventional loudspeaker-type cordless telephone device.

[Description of Signs] 1... Cordless master unit 5... Master unit wireless transmission circuit 11... Master unit wireless reception circuit 21. Dress slave unit 22: slave unit microphone 24: slave unit wireless transmission circuit 27: slave unit control signal transmission circuit 28: slave unit wireless reception circuit 29 reception amplifier 30 slave unit speaker FK1 talk switch SS transmission mute circuit SR reception mute circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (1)

(57) [Claims] And transmitting and receiving the carrier modulated by a downstream and upstream voice signal and a control signal via a channel that captures the carrier.
In a loudspeaker-type cordless communication device provided with a cordless master unit (1) and a cordless slave unit (21) for talking with each other, the cordless master unit includes a downlink, an uplink extension / external line voice signal and channel Ho捉/ comprises a base unit radio transmitter circuit for transmitting and receiving modulated Kiyariya by opening control signal (5) and the base unit wireless receiver circuit (11), the co - Doresuko machine, downstream extension / external line audio signal and A slave radio receiving circuit (28) for receiving a carrier modulated by the channel capture / opening control signal, and a downstream extension / external line audio signal is transmitted to the slave loudspeaker (30) connected to the slave radio receiving circuit. A receiver amplifier (29) , a slave unit control signal transmission circuit (27) connected to the slave unit wireless reception circuit, and transmitting a control signal in accordance with the received channel capture / release control signal; Transmission times Handset wireless transmission circuit for transmitting an uplink speech signal output from the control signal and the handset microphone (22) is outputted from the (24)
Wherein the co - dress parent device blocks the uplink speech signal transmitted from said child machine microphone to the cordless base unit via said handset radio transmitting circuit, said cordless <br/> downstream extension audio signal And a talk switch (FK1) for transmitting to the slave unit .
Open and close in response to the operation of the
Communication mute circuit (SS) and reception mute circuit (SR)
And a cordless communication device.