JPH0613964A - Hand-free type cordless talking device - 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, a cordless master unit is provided with a downlink voice signal transmitted from a master unit microphone of the cordless master unit to a slave unit speaker of the cordless slave unit. The present invention relates to a press talk-type loudspeaker type cordless communication device which can be turned on / off by a talk switch.

[0002]

2. Description of the Related Art A conventional loudspeaker-type cordless communication device has a main unit microphone 4 as shown in FIG.
3, a cordless master unit 41 including a master unit speaker 42, a slave unit call switch 44, an extension response switch 45 and a cordless master unit antenna 41a, a slave unit microphone 53, a slave unit speaker 52, a ten-key pad 54, and a master unit call switch 55. , Extension response switch 56 and cordless cordless handset antenna 51a. The slave call switch 44, extension response switch 45, master call switch 55, and extension response switch 56 are push button switches with a display function provided with light emitting diodes on the key tops.

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 when the cordless handset 51 is placed on a dedicated charging stand 57 provided with a power plug 59, the cordless base unit 41 is charged freely. The charging lamp 58 indicates that the charging is completed. From the cordless base unit 41
In the case of an extension call for calling the dress slave device 51, the slave device call switch 44 of the cordless master device 41 is pressed. When the cordless handset 41's cordless handset call switch 44 is depressed, a cordless handset 51's cordless handset speaker 52 outputs a ringing tone, and at the same time, the light emitting diode provided on the key top of the extension response switch 56 blinks. When the extension response switch 56 of the cordless cordless handset 51 is pressed, the blinking light emitting diode is turned on and the cordless cordless handset 41 and the cordless cordless handset 5
1 is completed, and the upstream voice signal f ₂ transmitted from the cordless cordless handset 51 through the cordless cordless handset antenna 51a from the cordless cordless handset antenna 51a of the cordless cordless handset 51. Base unit speaker 42 via 41a
Sent to. Further, the downlink audio signal f ₁ output from the master microphone 43 is transmitted to the slave speaker 52 through the same route.

The cordless slave unit 51 to the cordless master unit 4
In the case of an extension call for calling 1, the master call switch 55 of the cordless handset 51 is pressed. When the master unit call switch 55 of the cordless slave unit 51 is pressed, the cordless master unit 41
A ringing tone is sent from the master unit speaker 42, and at the same time, the light emitting diode provided on the key top of the extension response switch 45 blinks. Extension switch 4 of cordless master unit 41
When 5 is pressed, the blinking light emitting diode is turned on to complete the communication path between the cordless master unit 41 and the cordless slave unit 51, and the cordless master unit 41 to the cordless slave unit 51.
Up in the same path as in the case of internal calls calling the transmit and receive downlink voice signal f _2, f _1.

The keypad 54 of the cordless cordless handset 51
Is operated, an outside line call can be made via the modular plug 48 provided in the cordless base unit 41. In the loudspeaker-type cordless communication device having the above-described structure, the call path is not completed unless the cordless master device 41 calls the cordless slave device 51 and the cordless slave device 51 operates a response key or the like. Moreover, since the cordless cordless handset 51 is not a loud type, the cordless cordless handset 5
There are difficulties such as having to hold 1 to make a call. Further, when the cordless cordless handset 51 is of a loudspeaker type, a voice switch must be provided. When the voice switch is provided, there are drawbacks such that it is necessary to provide a circuit element such as a solid-state switch, a level detector, a bandpass filter, etc., which constitutes the voice switch, and a program for controlling these circuit elements.

[0006] Further, the communication levels of the up and down audio signals f ₂ and f ₁ are the shape of the audio equipment such as the master microphone 43, the master speaker 42, the slave microphone 53, and the slave speaker 52, and the audio equipment is mounted. Since it is affected by acoustic coupling between the housing and the audio equipment, environmental noise, etc., even if a voice switch satisfying a complicated design condition is provided, there is a problem such as causing a so-called head-breaking phenomenon.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and by providing a talk switch, circuit elements such as a solid-state switch, a level detector, and a bandpass filter which constitute a voice switch are deleted, and a so-called head is provided. An object of the present invention is to provide a loudspeaker type cordless communication device capable of preventing a disconnection phenomenon.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a master radio transmitting circuit and a master radio receiving circuit for transmitting and receiving a carrier modulated by downlink and uplink extension / external voice signals and a channel capture / release control signal. A slave radio receiver circuit that receives a carrier modulated by a downlink extension / extension voice signal and a channel capture / release control signal, and a downlink extension / exterior voice signal that is connected to the slave radio receiver circuit and is transmitted to a slave speaker. A control signal output from the slave unit control signal transmission circuit, which is connected to the reception amplifier and the slave unit wireless reception circuit, and which transmits a control signal in accordance with the received channel capture / release control signal And a slave wireless transmission circuit that transmits an upstream audio signal output from the slave microphone, and an upstream audio signal transmitted from the slave microphone to the cordless master via the slave wireless transmission circuit. Blocked, and a talk switch for transmitting a downlink extension audio signal to cordless handset.

[0009]

[Operation] Go down by the master unit wireless transmission circuit and the master unit wireless reception circuit,
Transmits and receives carriers modulated by upstream and external voice signals and channel capture / release control signals. The slave radio reception circuit receives the downlink / extension voice signal and the carrier modulated by the channel capture / release control signal. In the slave unit control signal transmission circuit, a control signal is transmitted according to the received channel capture / release control signal to secure the communication channel. Upward extension voice signals are prioritized in calls. When the talk switch is pressed, the upstream extension voice signal is cut off,
The downlink extension audio signal has priority.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a loudspeaker type cordless communication device according to the present invention will be described in detail below with reference to FIGS. A loudspeaker-type cordless communication device according to the present invention is shown in FIG.
A master unit microphone 2, a master unit speaker 14, a talk switch FK ₁ , a call switch FK ₂ , a monitor / end talk switch FK ₃ , and a master unit antenna 16 are provided in the dress master unit 1. Further, the cordless cordless handset 21, the cordless handset microphone 22, the cordless handset speaker 3
0, a call / answer switch FK ₄ is provided.

The call / answer switch FK ₄ is a push-button switch with a display function in which a light emitting diode is provided on the key top. The cordless base unit 1 is equipped with a power plug 19 and a modular plug 18 to which the telephone cord 17 is connected, and when the cordless handset 21 is placed on a dedicated charging stand 37 having a power plug 36, it can be charged freely and is being charged. Is displayed by the charging lamp 38.

As shown in FIG. 2, in the cordless base unit 1,
Base unit microphone 2, transmission amplifier 3, transmission mute circuit SS,
Base unit wireless 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 wireless reception circuit 11, reception amplifier 12,
Reception mute circuit SR, master speaker 14, control signal reception circuit 15, talk switch FK ₁ , call switch F
A K ₂ , a monitor / end call switch FK ₃ , a master CPU 20 and a master antenna 16 are provided. In addition, cordless cordless handset 2
1, a slave microphone 22, a transmission amplifier 23, a slave wireless transmission circuit 24, a transmission / reception duplexer 25, a ringing tone generation circuit 26, a control signal transmission circuit 27, a slave wireless reception circuit 28, a reception amplifier 29, a slave unit. A speaker 30, a control signal receiving circuit 31, a carrier sense circuit 32, a call / answer switch FK ₄ , a slave antenna 36 and a slave CPU 40 are provided.

The master microphone 2 of the cordless master device 1 is connected to the transmission mute circuit SS via the transmission amplifier 3, and the transmission mute circuit SS connects the master wireless transmission circuit 5, the transmission / reception duplexer 6 and the terminal 1a. It is connected to the base unit antenna 16 via the. Further, the outside line interface 7 for transmitting and receiving outside line voice from the terminal 1b to which the outside line L ₁ is connected is connected to the telephone circuit 8 which outputs the downlink outside line voice signal under the control of the parent device CPU 20 and outputs from the telephone circuit 8. The input side of the transmission amplifier 3 and the input side of the telephone circuit 8 are connected to the output side of the reception amplifier 12, respectively.

Talk switch FK ₁ , call switch F
K ₂ , monitor and end switch FK _3, and receiving radio circuit 1
The output side of the control signal receiving circuit 15 to which 1 is connected is the master device CP.
It is connected to the control input side of U20, and the control output side of the parent device CPU20 has a transmission mute circuit SS and a reception mute circuit S.
It is connected to the control input side of R, the control signal transmitting circuit 9, and the ringing tone generating circuit 10. The reception side of the transmission / reception branching filter 6 is connected to the master speaker 14 via the master wireless reception circuit 11, the reception amplifier 12, and the reception mute circuit SR.

The slave antenna 36 of the cordless slave 21 is connected to the terminal 21a, and the terminal 21a is connected to the transmission / reception duplexer 25.
The wireless receiver circuit 28, the reception amplifier 29, and the speaker 30 are connected via the. The output side of the slave radio receiving circuit 28 is connected to the input sides of the control signal receiving circuit 31 and the carrier sense circuit 32, and the output sides of the control signal receiving circuit 31 and the carrier sense circuit 32 are the calling / answer switch F.
It is connected to the control input side of the child device CPU 40 to which K ₄ is connected. The output side of the ringing tone generation circuit 26 and the control signal transmission circuit 27 which are controlled by the slave CPU 40 is the slave CPU.
40 is connected to the input side of the slave radio transmission circuit 24 to which it is connected.

In the loudspeaker-type cordless communication device having the above-mentioned structure, the downlink radio wave f ₁ and the uplink radio wave f ₂ which are composed of a carrier modulated by a voice signal and a control signal or an unmodulated carrier are used as a master antenna 16 and a slave unit. Transmission / reception is performed between the antennas 36. The downlink radio wave f ₁ includes a downlink extension voice signal, a downlink external voice signal, and a downlink ringing tone signal as voice signals, and the control signal includes a channel capture signal and a channel open signal. Upward radio wave f ₂
The voice signals include an upstream extension voice signal, an upstream external voice signal, and an upstream ringing tone signal, and the control signals include an internal line response signal and an external line response signal.

A downlink extension voice signal uses a route of the master unit microphone 2 and the transmission amplifier 3, and a downlink external line voice signal uses a route of the outside line interface 7 and the telephone circuit 8. Further, the modulated down ringing tone signal is directly sent from the ringing tone generating circuit 10 to the master unit wireless transmission circuit 5. The control for transmitting the downlink extension voice signal, the downlink external voice signal, and the downlink ringing tone signal from the control signal transmitting circuit 9 according to the operation of the talk switch FK ₁ , the call switch FK ₂ , and the monitor / end call switch FK _3. Signal (capture, open) and transmission mute circuit SS,
This is performed by the operation and recovery of the reception mute circuit SR.
Whether the monitor / end-call switch FK ₃ functions as a monitor or an end-call switch is determined by the parent device CPU 20.
It is determined by the control sequence.

Upward extension / external line audio signals are transmitted from the handset microphone 2
2, in the path of the transmission amplifier 23, the slave radio transmission circuit 24,
The upward ringing tone signal is sent from the ringing tone generating circuit 26 under the control of the handset CPU 40 to the handset wireless transmission circuit 24.
When the call / answer switch FK ₄ is operated, a control signal (extension response ...
External line response ... Key response operation) is transmitted. Whether the control signal is a non-key extension response or a keyed external response is a slave CPU 40.
It is determined by the control sequence of.

When the call switch FK ₂ of the cordless base unit 1 is operated, the control signal transmission circuit 9 operates under the control of the base unit CPU 20 and a control signal (capture) is transmitted from the base unit antenna 16 as a downlink radio wave f _1. To be done. This control signal (capture) is received by the slave antenna 36 and sent from the control signal receiving circuit 31 to the slave CPU 40. Child machine CPU40
Judges that the control signal (capture) is the operation of the call switch FK ₂ of the cordless master unit 1, and returns the control signal (extension response) from the slave unit wireless transmission circuit 24 as a keyless extension response. The master CPU 20 of the cordless master 1 is the slave wireless transmission circuit 2
When the control signal (extension response) is received from 4, the ringing tone generation circuit 10 is controlled to transmit the downlink 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, so that the cordless slave unit 21 that has heard the downlink ringing signal.
When the upstream audio signal is transmitted from the child device microphone 22, the upstream speaker 14 can listen to the upstream audio signal.

When the talk switch FK ₁ is operated, the transmission mute circuit SS is opened, the reception mute circuit SR is closed, and the downlink extension audio signal is transmitted with priority over the uplink extension audio signal. To end the call and open the captured channel, operate the monitor / end switch FK ₃ . Control signal (open) when the monitor and end call switch FK ₃ is operated
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 unit 1 and the cordless slave unit 21, the talk switch FK
_{When 1} is operated, the transmission mute circuit SS is opened, the reception mute circuit SR is closed, and the downlink extension audio signal is transmitted. The transmission / reception of the control signal (capture) is the same as the operation of the call switch FK _2. However, in this case, since the ringing tone generation circuit 10 is not controlled by the master CPU 20, the downlink ringing tone signal is not transmitted and the downlink extension voice is transmitted. A signal will call the cordless handset 21.

When the cordless master unit 1 monitors the upstream outside line voice signal of the cordless slave unit 21, the monitor / end call switch FK ₃ is operated. Monitor and talk switch F
When K ₃ is operated, the transmission mute circuit SS is closed and the reception mute circuit SR is opened according to the control sequence, and transmission is performed through the path of the slave microphone 22 of the cordless slave 21, the transmission amplifier 23, and the slave wireless transmission circuit 24. The upstream outside line voice signal can be monitored by the master unit microphone 2 of the cordless master unit 1.

While the cordless base unit 1 is talking on the cordless base unit 21, from the cordless base unit 1 to the cordless base unit 21,
Or co - Doresuko machine 21 to child - downlink ringing signals to dress the main unit 1, the transmitting and receiving uplink ringing signals are co - dress base unit 1 call switch FK ₂ or co - Doresuko machine 21
The call / answer switch FK _{4 of} is operated. When the call switch FK ₂ is operated, a downlink ring tone signal is transmitted, and when the call / answer switch FK ₄ is operated, it becomes a control signal (call) according to a control sequence, and an uplink ring tone signal is transmitted.

When an external call is received from the terminal 1b to which the external line L ₁ is connected, the telephone circuit 8 notifies the master CPU 20 that the external call has been received. The parent device CPU 20 controls the incoming call to the outside line, first sends the control signal (outside line incoming) from the control signal sending circuit 9, and then sends the outside line incoming call. When the cordless handset 21 receives a control signal (outside line incoming), the light emitting diode provided on the key top of the call / answer switch FK ₄ blinks and a ringing tone is sent from the handset speaker 30 via the receiving amplifier 29. It Call / answer switch FK
_{When 4} is pressed, the light emitting diode blinks and the control signal (external line response) is returned from the handset wireless transmission circuit 24. When the master unit CPU 20 of the cordless master unit 1 receives the control signal (external line response) from the slave unit wireless transmission circuit 24, it controls the telephone circuit 8. Under this control, the telephone circuit 8 operates in the same manner as when it goes off-hook with respect to the outside line interface 7. When a ring trip occurs due to an off-hook, the upstream external voice signal as the upstream radio wave f ₂ is received by the master unit radio reception circuit 1
1, sent to the telephone circuit 8 via the receiving amplifier 12.
Further, a downlink radio wave f1 as a downlink external line audio signal is transmitted from the master antenna 16 through the route of the telephone circuit 8, the transmission amplifier 3, the opened transmission mute circuit SS, and the master wireless transmission circuit 5. In this case, the reception mute circuit SR is open as in the monitor mode. Cordless cordless handset 21
The amplification factor of the receiving amplifier 29 is controlled to a low level, and the call becomes the same as that of a normal handset. When the call / answer switch FK ₄ is pressed while the light emitting diode is lit, the light emitting diode is extinguished and a control signal (external line termination) is transmitted from the handset wireless transmission circuit 24. Master device CPU 20 of cordless master device 1
When receiving a control signal (extension of the outside line) from the handset wireless transmission circuit 24, controls the telephone circuit 8 and performs an on-hook operation.

In the above-described embodiment, the case of one cordless child device has been described, but the number of cordless child devices is not limited to one. Further, it may be applied to a cordless telephone such as a handset type or a pocket type other than the loudspeaker type cordless communication device.

[0026]

By providing a talk switch, a solid state switch which constitutes a voice switch, a level detector,
Circuit elements such as a bandpass filter can be deleted to reliably prevent a so-called head-cutting phenomenon.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an embodiment of a loudspeaker type cordless communication device according to the present invention.

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

[Explanation of symbols]

5 ·· Parent device wireless transmission circuit 11 ·· Parent device wireless reception circuit 24 ··· Child device wireless transmission circuit 27 ··· Child device control signal transmission circuit 28・ ・ ・ ・ Handset radio receiver circuit 29 ・ ・ ・ ・ Receiver amplifier FK ₁・ ・ ・ Talk switch

Claims (1)

[Claims] 1. Transmission / reception via a channel capturing a carrier modulated by a downstream / upstream audio signal and a control signal,
A loudspeaker-type cordless communication device equipped with a cordless master unit and a cordless slave unit, which communicate with each other, transmits / receives a carrier modulated by a downward / upward extension / extension voice signal and a channel capture / release control signal. A master unit wireless transmitter circuit and a master unit wireless receiver circuit, a slave unit wireless receiver circuit for receiving a carrier modulated by a downlink extension / outside line voice signal and a channel capture / release control signal, and the slave unit wireless receiver circuit. A receiving amplifier connected to the slave unit and transmitting a downlink extension / outside line audio signal to the speaker, and connected to the slave unit wireless receiving circuit,
A slave unit control signal transmitting circuit that transmits a control signal in accordance with the received channel capture / release control signal, a control signal output from the slave unit control signal transmitting circuit, and an upstream voice signal output from the slave unit microphone. A handset wireless transmission circuit for transmitting, and a talk switch for blocking an upstream voice signal transmitted from the handset microphone to the cordless base unit via the handset wireless transmission circuit and transmitting a downlink extension voice signal to the cordless handset. A loudspeaker-type cordless communication device characterized by comprising: