JPH0359613B2 - - Google Patents

Description

Detailed Description of the Invention The present invention uses a transmitter/receiver connected to an existing telephone as a master station, and connects it to a portable slave station wirelessly, so that the slave station is connected to an outside line via the master station. Regarding a cordless telephone device that allows calls to be made between a central office and an outside line, as well as to freely communicate between the existing telephone set of the master station and a slave station as an intercom, it is particularly important that when calling a slave station from the master station, the cordless telephone device The present invention relates to a cordless telephone device characterized in that the calling signal of the slave station is prevented from continuing to ring by stopping the calling signal in response to a response from the slave station even if the calling switch of the telephone continues to be operated.

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

Figure 1 shows the configuration of the master station, where 1 is the terminal L ₁ ,
A transmitter/receiver connected to an outside line at L ₂ and connected to an existing telephone 2 at terminals L ₃ and L ₄ , one terminal L ₃ of the telephone 2 is directly connected to the outside line terminal L ₂ , and
The other terminal _L4 is connected to the outside line terminal _L1 via a relay contact RYS-3, which will be described later. 3 is a hybrid transformer circuit that outputs the transmission signal to the slave station and the reception signal from the slave station, and as shown in Fig. 3, it is composed of transformers T ₁ and T ₂ , and coils l ₁ ,
l ₂ are connected in series and relay contact RYS-21, RYS
-3 to external lines _L1 and _L2 , the transmitting signal is taken out from the coil _l6 , and the receiving signal is input to the coil _l3 . Reference numeral 4 denotes a low frequency amplification circuit for amplifying the transmission signal output from the hybrid transformer circuit 3, and the amplified output is guided to a transmission circuit 5 and transmitted from an antenna 6. Reference numeral 7 designates a normal heterodyne receiving circuit that receives radio waves transmitted from a slave station, and is composed of a frequency conversion circuit 8, an intermediate frequency amplification circuit 9, a detection circuit 10, and a low frequency amplification circuit 11.
The output of the hybrid transformer circuit 3 is led to the hybrid transformer circuit 3. In this case, the transmitting radio waves and the receiving radio waves use different frequencies, allowing simultaneous calls.

12 is a tone signal f ₁ generating circuit with a frequency f ₁ that is activated when calling a slave station, and the tone signal f ₁ is generated by the mixer 1.
3, the signal is guided to a transmitting circuit 5, the carrier wave is modulated, and the signal is transmitted from an antenna 6. This tone signal _f1 generating circuit 12 is activated when the call switch 14 is operated and when the first
When the bell signal detection circuit 15 detects an incoming call from an outside line, the OR gate is configured to generate a tone signal _f1 .
Control signals are supplied via relay contacts RYS-1 and RYS-22. 16 is a tone signal f ₂ detection circuit that detects the tone signal f ₂ transmitted from the slave station;
It is configured to detect a tone signal _f2 indicating that the slave station to which the output of the detection circuit 10 is guided is in a transmitting state, and to control the master station.

RY-1 is the first relay that is excited by the output of the OR gate OR1 and the conduction of the transistor _Q1 whose base is inputted with the tone signal _f2 via the OR gate OR2, and the relay contact RYS-1 is excited by the relay's excitation. When the main station is closed, power is supplied to the low frequency amplifier circuit 4 and the transmitting circuit 5, and the master station is set to the transmitting state. RY-2 is a second relay that is excited by the conduction of transistor Q ₂ upon detection of tone signal f _2. By closing relay contact RYS-21, it connects the line to the slave station and also connects the normally closed relay. contact
Opening RYS-22 serves to prevent the slave station from generating tone signal f ₁ when it is in the transmitting state. RY-3 is a third relay that is excited by the conduction of transistor Q3 when flip-flop FF- ₁ is set by the output of AND gate _A1 to which call switch signal _S1 and tone signal f2 are input.
By switching the shooting type relay contact RYS-3 from the normally closed contact on the A side to the normally open contact on the B side, the outside line is connected to the second bell signal detection circuit 17 during an intercom call between the master station and the slave station. It works like this. The flip-flop FF-1 is configured to be reset by the output of the one-shot multivibrator 18 which is activated when the tone signal _f2 disappears due to the end of the intercom call, and the reset of the flip-flop FF-1 resets the third relay RY-.
3 is demagnetized.

Reference numeral 19 denotes a calling signal generating circuit driven by the output of the second bell signal detecting circuit 17, which generates a calling signal from the speaker 20 when a call is received on an outside line during an intercom call. The first and second bell signal detection circuits 15 and 17 are composed of a neon lamp 21, a photocell 23 consisting of a CDS 22, and a transistor _Q4 , as shown in FIG. The neon lamp 21 is turned on,
When the resistance value of the CDS 22 decreases, the transistor _Q4 becomes conductive, so that the output signal is extracted from the emitter. FIG. 2 is a diagram showing the configuration of the slave station, where 24 is a receiving section that receives radio waves transmitted from the master station, and 25 is a transmitting section that receives radio waves toward the master station. The receiving section 24 includes a frequency conversion circuit 26 and an intermediate frequency amplification circuit 2 that constitute a heterodyne receiver.
7. The detection circuit 28, the low frequency amplification circuit 29, the speaker 30, the tone signal f ₁ detection circuit 31, which is driven by the generation of the tone signal f ₁ , and the output is sent to the mixer 32
The calling signal generating circuit 33 is guided to the low frequency amplifying circuit 29 via the calling signal generating circuit 33.

On the other hand, the transmitter 25 includes a low frequency amplification circuit 35 that amplifies the output of the microphone 34, a tone signal _f2 generation circuit 36, a dial pulse generation circuit 37, the low frequency amplification circuit 35, and a tone signal _f2 generation circuit 36. , a dial pulse generation circuit 37 , a transmission circuit 38 and a switch circuit 39 that modulate and transmit a carrier wave using the output of the low frequency amplification circuit 35 , the tone signal f ₂ and the output of the dial pulse generation circuit 37 .
It consists of The switch circuit 39 flip-flops every time the return type response switch 40 is operated.
AND to set and reset FF-2 alternately
It is composed of gates A2 and A3. The set output of the flip-flop FF-2 is configured to supply power to the low frequency amplifier circuit 35, the transmitting circuit 38, and the tone signal _f2 generating circuit 36. 4
1 is a rechargeable battery, and the power switch 42
It is configured to supply power to the receiving section 24 and the transmitting section 25 via the power switch 42, and when the power switch 42 is closed, the receiving section 24 is supplied with power and is set to a reception standby state.

Next, the operation of the present invention having such a configuration will be explained.

First, a case will be explained in which a call is received on an outside line while both the master station and the slave station are in a reception standby state. At this time, the relay contact RYS-3 of the master station is switched to the A side, so that the telephone 2 rings with a bell signal, and
When the bell signal is detected by the first bell signal detection circuit 15, the first bell signal is detected via the OR gates OR1 and OR2.
Energize the relay (RY-1) and connect the relay contact (RYS
-1, the transmitting circuit 5 is driven and set to the transmitting state, and at the same time, the tone signal _f1 generating circuit 12
The tone signal f ₁ is generated by driving the antenna 6, and the tone signal f ₁ is transmitted from the antenna 6. Tone signal from master station
When f ₁ is transmitted, the tone signal f ₁ is received by the slave station in reception standby state, and the tone signal f ₁ detection circuit 3
When the tone signal f ₁ is detected, the calling signal generating circuit 33 is driven, and a calling signal is generated from the speaker 30, indicating that there is an incoming call.

While checking for incoming calls at the same time on the master station and slave station,
First, the operation when the master station responds will be explained.
When the master station picks up the handset, it can make an outside call in the same way as a normal telephone. At this time, when the master station picks up the receiver, the bell signal is stopped, the transmission of the tone signal _f1 is stopped, and the calling signal at the slave station is also stopped.

Next, a case in which a slave station responds to an incoming call on an outside line will be explained. When the person at the slave station, who has learned of the incoming call from the ringing tone, closes the response switch 40, the AND gate A2 is opened and the flip-flop FF- ₂ is set to the low frequency amplification circuit 35, the transmission circuit 39, and the tone signal f2 generation circuit 36. is supplied with power and a tone signal f ₂ is transmitted. When the tone signal f ₂ is transmitted, the master station receives it, and the tone signal f ₂ detection circuit 16 detects the tone signal f ₂ . By keeping the transistor Q1 conductive via the OR gate _OR2 upon detection of the tone signal _f2 , the first relay RY-1 is maintained in the transmitting state, and the transistor
The second relay RY-2 is energized by the conduction of Q ₂ , and by closing the relay contact RYS-21, the outside line is
The lines between L ₁ and L ₂ and the slave stations are connected, and you can talk to outside lines. After the call ends, by operating the response switch 40 of the slave station again, the AND gate A3 is opened, flip-flop FF- ₂ is reset, and the transmission of the tone signal _f2 is stopped. , 1st, 2nd relay
RY-1 and RY-2 become inoperable, and both the master station and slave station return to the reception standby state.

Next, the operation of calling an outside line from the master station or slave station will be explained. When making a call from the master station first,
You can make a call to an outside line by picking up the handset and dialing like you would with a normal telephone. On the other hand, when making a call to an outside line from the slave station, first the response switch 40 is closed and a tone signal _f2 is transmitted. Upon reception of the tone signal _f2 from the slave station, the master station is set to the transmitting state as described above, and the line between the slave station and the outside line is connected by closing the relay contact RYS-21. After the slave station receives the dial tone sent from the exchange through the line connection, it dials using the dial pulse generation circuit 37, and the tone signal _f2 is modulated according to the dial pulse, so that the relay contact RYS-21 is modulated accordingly. is opened and closed, and dial pulses are sent to the outside line. Therefore, if the other party picks up, the call can be made between the outside line and the slave station. After the call ends, by operating the response switch 40 again, both the master station and the slave station are returned to the reception standby state.

Next, the intercom operation for freely communicating between the master station and slave stations will be explained. At this time, the master station first picks up the handset of telephone 2 and switches the call switch 14.
Perform the closing operation. When the call switch 14 is closed,
Transistor Q ₁ via OR gates OR1 and OR2
conducts, and drives the tone signal f ₁ generating circuit 12. Therefore, as described above, the tone signal _f1 is transmitted from the master station. When the tone signal f ₁ is transmitted from the master station, a calling signal is generated from the speaker 30 in the slave station in the receiving standby state, as described above, and the slave station is called. When the person at the slave station who hears the calling signal closes the response switch 40, the tone signal _f2 is transmitted as described above. At the master station that receives the tone signal _f2 , upon detection of the tone signal _f2 , the transistor _Q1 is turned on via the OR gate OR2.
By continuing to conduct the call switch 14
Even after the operation is released, the first relay RY-1 is energized to keep the master station in the transmitting state, and the second relay RY-2 is energized by the conduction of the transistor _Q2 , closing the relay contact RYS-21. By opening the RYS-22, a line is formed between the telephone set 2 and the slave station, and by stopping the transmission of the tone signal _f1 , the calling signal of the slave station is stopped. Therefore,
To prevent a calling signal of a slave station from continuing to ring when a calling switch 14 continues to be operated. At this time, when the tone signal _f2 is detected, the AND gate A1 is opened, the flip-flop FF-1 is set, and the third relay RY-3 is kept energized by the conduction of the transistor _Q3 , so that the relay contact RYS-3 is connected to B.
Switch to the side, intercom talking phone 2 and outside line
Cut off L ₁ and L ₂ .

These operations are performed instantaneously, and the master station releases the operation of the call switch 14 when it hears the response voice from the slave station. Even after the call switch 14 is released, the line is maintained as described above, and the voice of the master station is transmitted through the coil of the hybrid transformer circuit 3.
The sound from the slave station is guided from _l6 to the transmitter circuit 5 and transmitted, and reproduced by the speaker 30 of the slave station.The voice of the slave station is also guided to the coil _l3 of the hybrid transformer circuit 3 of the master station and reproduced by the receiver. , you can talk to each other freely. After the call ends, by operating the response switch 40 of the slave station again, flip-flop FF-2 is reset and the tone signal f ₂ is reset.
When transmission is stopped, the tone signal _f2 disappears in the master station, causing the first, second, and third relays RY-1,
RY-2 and RY-3 become inactive and return to the initial reception standby state.

In addition, as mentioned above, if a call is received on an outside line while talking with a slave station as an intercom, the relay contact
When RYS-3 is switched to the B side, when the bell signal is guided to the second bell signal detection circuit 17, the photocell 23 conducts the transistor _Q4 , and the output is guided to the calling signal generation circuit 19. , a ringing signal is generated from the speaker 20. Therefore, the master station knows that there is an incoming call on the outside line. When the master station hears the call signal, it informs the slave station, cancels the call between the master station and the slave station, and switches to an outside line. To switch to the outside line, the slave station performs a return operation, and when the third relay RY-3 is inoperable, the relay contact RYS-3 is switched back to the A side, and the outside lines L ₁ and L ₂ are connected to the telephone 2. You can make calls to outside lines.

As described above, the cordless telephone device of the present invention, when calling a slave station from a master station, stops sending control signals to the slave station in response to a response from the slave station while a communication line is being established between the master station and the slave station. This prevents the ringing signal of the slave station from continuing to ring if the master station does not stop transmitting the control signal, and also prevents the ringing switch from being accidentally switched off while the master station and slave station are talking. It is possible to prevent the ringing signal of the slave station from ringing when the terminal is operated.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the master station of the cordless telephone device of the present invention, FIG. 2 is a diagram also showing the configuration of the slave station, FIG. 3 is a diagram showing the configuration of the hybrid transformer circuit of FIG. FIG. 4 is a diagram showing the configuration of the first and second bell signal detection circuits. 1 ... Master station transceiver, 2... Telephone, 3...
Hybrid transformer circuit, 5... Transmission circuit, 7
...Reception circuit, 12 ...Tone signal _f1 generation circuit,
14...Call switch, 15...First bell signal detection circuit, 16...Tone signal _f2 detection circuit, 17
... Second bell signal detection circuit, 24 ... Receiving section, 2
5... Transmission unit, 31... Tone signal _f1 detection circuit,
36...Tone signal _f2 generation circuit, 37...Dial pulse generation circuit, 40...Response switch.

Claims (1)

[Claims] 1 Consists of a master station connected to a telephone line and equipped with a transmitter/receiver, and a slave station connected wirelessly.The slave station is connected to an outside line via the master station, and also serves as an intercom between the master station and slave stations. In a cordless telephone device capable of making telephone calls, the master station is provided with means for transmitting a control signal for calling a slave station by operating a call switch, and the slave station receives the transmitted control signal and generates a ringing signal. The master station is configured to call the slave station from the master station, and is further provided with means for transmitting a control signal to the slave station in response to the call, and the master station receives the control signal from the slave station to call the slave station. 1. A cordless telephone device, comprising means for forming a communication line between a station and a slave station, and for stopping transmission of a control signal to the slave station while the communication line is being formed.