JPH0229252B2 - - Google Patents

Description

Detailed Description of the Invention The present invention uses a transmitter/receiver connected to an existing telephone set as a master station, and connects it to a portable slave station wirelessly, thereby connecting the slave station and an outside line, and connecting the base station to a portable slave station. With regard to cordless telephone equipment that can be used as an intercom to freely communicate between an existing telephone and a slave station, we have developed a forwarding function that allows calls to be forwarded to the master station with a simple operation even when the slave station answers an incoming external call. The present invention relates to a cordless telephone device.

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 a relay contact RYS-4, which will be described later.
It is connected to external line terminal _L1 via RYS-31. 3 is a hybrid transformer circuit that outputs the transmission signal to the slave station and the reception signal from the slave station;
As shown in the figure, it consists of transformers T ₁ and T ₂ , coils L ₁ and L ₄ are connected in series, and the relay contact
It is connected to external lines L ₁ and L ₂ via RYS-4, RYS-21, and RYS-61, and is configured such that a transmission signal is taken out from coil l ₆ and a reception signal is input to coil l ₃ . 4 is a hybrid transformer circuit 3
This is a low frequency amplification circuit that amplifies the transmission signal output from the antenna 6.
It is configured to be sent by Reference numeral 7 denotes a normal heterodyne receiving circuit that receives radio waves transmitted from the 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 is led to a 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, or when the master station transfers the received call to the slave station, the OR gate is configured to generate a tone signal _f1 .
Control signals are supplied via relay contacts RYS-1 and RYS-22. Reference numerals 16, 17, and 18 are tone signal detection circuits for detecting tone signals f ₂ , f ₃ , and f ₄ transmitted from the slave stations, and the outputs of the detection circuit 10 are respectively guided to detect the tone signals. . Note that among the tone signals f ₂ , f ₃ , and f ₄ , f ₂ indicates that the slave station is in the transmitting state, f ₃ indicates that the slave station is operating the intercom, and f ₄ indicates that the slave station is operating the intercom. This indicates that the station is performing a transfer operation to the master station, and the master station is controlled by detecting this tone signal. RY-1 is the first relay that is energized by the conduction of transistor Q1 whose base is input to the output of OR gate OR1 and tone signal _f2 via OR gate OR2, and the relay contact is activated by the strong magnetism of the relay.
By closing RYS-1, 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 energized by the conduction of transistor Q ₂ upon detection of tone signal f _2. By closing the normally open relay contact RYS-21, it connects the line to the slave station and also connects the normally closed relay contact RYS-21. Opening relay contact RYS-22 serves to prevent tone signal _f1 from being generated when the slave station is in the transmitting state. RY-3 is tone signal f ₂
The third relay is energized by the conduction of the transistor _Q3 by the output of the AND gate A1 to which the inverter output of the tone signal _f3 and the inverter output of the slave station line control circuit 25, which will be described later, are input, and is a normally closed relay. By opening the contacts RYS-31 and RYS-32, it acts to cut off the line of the telephone 2 of the master station. P1 is a light emitting display element that lights up when transistor _Q3 is turned on, and indicates that the slave station is talking to an outside line. Also, this third relay R1
-3 is connected to a power source via a relay contact RYS-64, and is configured so that it is not excited when the relay contact RYS-64 is OFF. In RY-4, tone signal _f3 and “H” level signal are relay contacts.
AND gate A2 input via RYS-65
The fourth relay is excited by the conduction of the transistor _Q4 by the output of the OR gate OR3 to which the output of the slave station line control circuit 25, which will be described later, is input.
By switching the shooting type relay contact RYS-4 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 19 during an intercom call between the master station and the slave station. It works like this. _P2 is a light emitting display element that lights up when transistor _Q4 is turned on, and indicates that an intercom call is in progress.

20 is a call switch signal S1, an output signal _S2 of the line connection detection circuit 21, an output signal _S3 of the slave station line control circuit 25, a transfer switch signal _S4 , and a tone signal.
In a hold control circuit with _f4 as input, when transferring from the master station to the slave station or from the slave station to the master station, by generating an output in the transfer operation, the fifth relay RY- ₅ is activated by conduction of transistor Q5. Energize the relay contact
RYS-5 is closed to hold the outside line, and a tone signal f ₁ is transmitted via diode D1.
By operating the generating circuit 12, the tone signal f ₁
It acts to generate. P ₃ is a transistor
A light-emitting display element that lights up when _Q5 is conductive indicates the pending status. The hold control circuit 20 is constructed as shown in FIG. 4, and the output of the AND gate A3 to which the tone signal _f4 and the call switch signal _S1 are input is sent to the flip-flop FF-1 via the OR gate OR5. is input to the set terminal S, and
The output of the AND gate A4 to which the transfer switch signal _S4 and the output signal _S2 of the line connection detection circuit 21 are input is connected to the first input, and the reset output of the flip-flop FF-1 is connected to the second input. ,
Furthermore, the output of the AND gate A5, which is set at the output of the AND gate A3 and inputted with the reset output of the flip-flop FF-2 which is reset by the signal _S3 from the slave station line control circuit 25, is input to the third input. Flip-flop through gate OR5
It is input to the set terminal S of FF-1. or,
The output of the AND gate A4 and the output of the AND gate A6 to which the set output Q of the flip-flop FF-1 is input are connected to the reset terminal R of the flip-flop FF-1.
A set output Q of -1 is provided to the base of transistor _Q5 .

21 is a line connection detection circuit that detects when the receiver of the telephone ₂ of the master station is picked up and the line is connected. The relay contact RYS-61 is opened to cut off the line to the slave station, and the normally open relay contact RYS-62 is closed to drive the line use signal generation circuit 22 to generate the line use signal _f5 . act. This line connection detection circuit 21 detects changes in line voltage between when the line is connected and when it is not connected, and as shown in FIG.
When the line voltage drops below the set voltage during line connection, the voltage comparator 24 generates an output and operates to make the transistor _Q5 conductive.

25 is a call switch signal S ₁ , a tone signal f ₂ ,
In the slave station line control circuit which receives the tone signal _F4 and the transfer switch signal _S4 as input, the seventh relay RYS _- 7 is excited by making the transistor Q7 conductive,
By opening the normally closed relay contact RYS-7, the sixth relay RY-6 is rendered inoperable. The slave station line control circuit 25 includes three flip-flops FF-3 and FF- as shown in FIG.
4, consists of FF-5, flip-flop FF-
3 is the output of AND gate A7 which is opened when the call switch signal _S1 and the tone signal _f2 match, or when the tone signal _f2 is present, the one-shot multivibrator 2 is operated by the operation of the transfer switch 26.
AND gates A7 and A8 are set so that they are set by the output of AND gate A8, which is opened when the output of
The output of a pulse generator 28, which is connected to the set terminal S via an OR gate OR6 and which generates a pulse at the rising edge of the tone signal fB so as to be reset at the falling edge of the tone signal _f2 , is connected to the reset terminal via the OR gate OR7. The set output Q is connected to the base of transistor Q7. Furthermore, the output of the AND gate A7 of the flip-flop FF-4 is connected to the set terminal S, and the output of the AND gate A7 is connected to the set terminal S.
6 outputs and one shot multi-vibrator 2
The output of 7 is connected to the reset terminal R via an OR gate OR8, and the set output Q is led to one input of the OR gate OR-3 via an OR gate OR9 to which the call switch signal _S1 is input. ing. The flip-flop FF-5) is configured to be set by the output of the AND gate A9, which is opened when the call switch signal _S1 and the tone signal _f4 match, and reset by the output of the one-shot multivibrator 27, and the set output is connected to the delay circuit. 29 and an AND gate A to which the output of the one-shot multivibrator 27 is input to one input.
connected to the OR gate OR7 via 10;
It is configured to reset flip-flop FF-3. Moreover, the output of the pulse generator 28 is
It is input to the reset terminal of flip-flop FF-2 of the hold control circuit 20.

30, the output of the second bell signal detection circuit 19 and the output of the calling signal control circuit 31 are connected to an OR gate.
4, which is driven when a call is received from an outside line during an intercom call or when a slave station calls the intercom, and generates a call signal from the speaker 32.

The first and second bell signal detection circuits 15 and 19 are composed of a neon lamp 33, a photocell 35 consisting of a CDS 34, and a transistor _Q9 , as shown in FIG. 33 is turned on and the resistance value of Cds34 decreases, causing transistor _Q9 to conduct.
It operates so that an output signal is taken out from the emitter.

Further, as shown in FIG. 8, the calling signal control circuit 31 is set by the output of an AND gate A11 inputting the calling switch signal _S1 and the tone signal _f3 , and outputs a pulse at the falling edge of the tone signal _f3 . It consists of a flip-flop FF-6 which is reset by the output of the pulse generator 36, the reset output of the flip-flop FF-6, and an AND gate A12 which receives the tone signal _f3 as input.
The operation of the calling signal generating circuit 30, which is driven by the generation of the tone signal _f3 , is stopped by setting the flip-flop FF-6 by operating the calling switch 14.

RY-8 is the eighth relay that drives the line use signal generator 22, and is excited by the conduction of the transistor _Q8 by the output of the reset circuit 37, and closes the relay contact RYS-8 to supply power and generate a tone. Generate signal _f5 . The reset circuit 37 is constructed as shown in FIG. 9, and is a flip-flop FF which is set by the transfer switch signal _S4 and reset by the output of the pulse generator 38 which generates a pulse at the falling edge of the tone signal _f2 . -7
, tone signal f ₂ and output signal S ₅ of OR gate OR3
the inverter output and the flip-flop
AND gate A13 to which the reset output of FF-7 is input, a timer circuit 39 that is activated by the output generation of AND gate A13 and generates a pulse output after a predetermined period of time, and a timer circuit 39 that generates a pulse at the falling edge of the output of AND gate A13. The flip-flop FF-8 is set by the output of the pulse generator 40 and reset by the output of the pulse generator 38, the output of the timer circuit 39, and the flip-flop FF-8.
AND gate A with the reset output of 8 as input
14, and the output of AND gate A14 is input to the base of transistor _Q8 . 41 is a reset switch connected in series with the relay contact RYS-32, and optionally the line use signal generating circuit 22.
and acts to generate a tone signal _f5 .

FIG. 2 is a diagram showing the configuration of the slave station, where 42 is a receiving section that receives radio waves transmitted from the master station, and 43 is a transmitting section that transmits radio waves to the master station. The receiving section 42 includes a frequency conversion circuit 4 that constitutes a heterodyne receiver.
4. The intermediate frequency amplification circuit 45, the detection circuit 46, the low frequency amplification circuit 47, the speaker 48, the tone signal _f1 detection circuit 49, which are driven by the generation of the tone signal _f1 , and whose output is low through the mixer 50. The calling signal generation circuit 52 guided to the frequency amplification circuit 47, the tone signal _f5 detection circuit 53, and the tone signal _f5
A line use signal generation circuit 54 which is input via the AND gate A15, driven by the generation of the tone signal _f5 , and whose output is led to the mixer 50, a carrier wave detection circuit 55, and a transistor made conductive by the circuit output. It consists of Q ₁₀ and light emitting display element P ₄ .

On the other hand, the transmitter 43 includes a low frequency amplification circuit 57 that amplifies the output of the microphone 56, and a tone signal f ₂ ,
f ₃ , f ₄ generation circuits 58, 59, 60, dial pulse generation circuit 61, and the low frequency amplification circuit 57
It is composed of a transmitting circuit 62 and a switch circuit 63, which modulate and transmit a carrier wave using the tone signals f ₂ , f ₃ , f ₄ and the output of the dial pulse generating circuit 61 .
A switch circuit 63 sets each circuit to an appropriate operating mode. The switch circuit 63 consists of a return type response switch 64, an intercom switch 65, and a transfer switch 66.
The intercom switch 65 connects AND gates A16, A17 and
A18, A19 and OR gates OR10, OR11
It is composed of OR gates OR10, OR1
1 receives the tone signal f ₅ of the receiving section 42.
The output of a one-shot multivibrator 67 which operates upon generation of the tone signal _f5 from the detection circuit 53 is input, and the flip-flops FF-9 and FF-10 are reset even when the tone signal _f5 is generated. The set output Q of the flip-flop FF-9 supplies power to the low frequency amplifier circuit 57, the transmitting circuit 62 and the tone signal _f2 generating circuit 58, and the output of the flip-flop FF-10 supplies power to the tone signal _f3 generating circuit 59. In addition to supplying power, power is also supplied to the tone signal f ₂ generating circuit 58 and the like via the diode D ₂ . Also, flip-flop
The outputs of FF-9 and FF-10 are supplied to the receiving section 42 and are connected to the AND gate A1 via the OR gate OR12.
5 is entered. When the transfer switch 66 is closed, it supplies power to the tone signal f ₄ generation circuit 60 and also supplies power to the tone signal f ₃ generation circuit 59 via the diode D ₃ to generate the tone signal.
It acts to generate f ₃ and f ₄ . P ₅ is a light emitting display element that is turned on when the response switch 64 and intercom switch 65 are operated, and indicates the transmission state, and P ₆ is a light emitting display element that is turned on when the intercom switch 65 and transfer switch 66 are operated. to indicate that the intercom is in use.

A rechargeable battery 68 is configured to supply power to the receiving section 42 and the transmitting section 43 via a power switch 69.
When the receiving section 42 is closed, power is supplied to the receiving section 42 and the receiving section 42 is set to a receiving standby state.

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

It is assumed that the power switches of both the master station and the slave stations are closed and the receivers are set to a reception standby state. First, the intercom operation for freely communicating between the master station and the slave stations will be explained.

A case in which a slave station is called from a master station during a telephone conversation will be explained with reference to FIG. 10. At this time, the master station first picks up the receiver of the telephone set 2 (T ₁ in FIG. 10) and closes the call switch 14 (T ₂ in FIG. 10). When the call switch 14 is closed, the slave station line control circuit 2
The transistor _Q4 is made conductive through the OR gate OR9 and OR3 of the fourth
Relay RY-4 is energized and relay contact RYS-4
switch from the A side to the B side contact to cut off the connection between outside lines L ₁ and L ₂ and telephone 2, and at the same time switch the OR gate OR
1. Make transistor Q ₁ conductive via OR2,
It also drives the tone signal _f1 generating circuit 12 via the OR gate OR1. Therefore, the first relay RY-1
is energized, and when relay contact RYS-1 is closed,
The transmitting circuit 5 is operated and the tone signal _f1 is sent to the antenna 6.
Sent from When the tone signal f ₁ is transmitted from the master station, the tone signal f ₁ is transmitted by the slave station in reception standby state.
is received, and upon detection of the tone signal f ₁ by the tone signal f ₁ detection circuit 49, the paging signal generation circuit 52 is driven, whereby a paging signal is generated from the speaker 48 and the slave station is called.

The person at the slave station who hears the ringing signal from the speaker 48 closes the response switch 64 (first
Figure _0T3 ). Before this, the flip-flop FF-9 was in the reset state, so when the response switch 64 is closed and the AND gate A16 is opened, the flip-flop FF-9 is set and the low frequency amplifier circuit 57, the transmitting circuit 62 and the tone signal f ₂ are set. Power is supplied to the generation circuit 58, and the tone signal _f2 is transmitted. Upon transmission of the tone signal f ₂ , the master station receives it and detects the tone signal f ₂ using the tone signal f ₂ detection circuit 16 . By continuing to conduct the transistor _Q1 through the OR gate OR2 upon detection of the tone signal _f2 , the first relay RY-1 is energized and the transmitting state is maintained even after the call switch 14 is released, and the transistor The second relay RY-2 is excited by the conduction of Q ₂ , which closes the relay contact RYS-21 and opens RYS-22, thereby forming a line between the telephone 2 and the slave station, and transmitting the tone signal f ₁ . By stopping transmission, the calling signal of the slave station is stopped. Therefore, call switch 1
To prevent a calling signal of a slave station from continuing to ring when 4 continues to be operated. Furthermore, due to the generation of the tone signal _f2 , the AND gate A7 of the slave station line control circuit 25 is opened, and the flip-flops FF-3 and FF- are opened.
When 4 is set, flip-flop FF-4
The set output of is supplied to transistor _Q4 via OR gates OR9 and OR3, so that the fourth
While continuing to energize relay RY-4, transistor _Q7 of the set output of flip-flop FF-3
Transistor Q ₇ conducts when supplied to the 7th relay
Energize RY-7 and open relay contact RYS-7. By opening the relay contact RYS-7 and first picking up the handset of the master telephone 2,
The sixth relay RY-6, which was energized by the operation of the line connection detection circuit 21, becomes inoperable, and the relay contact
When RYS-61 returns, the aforementioned relay contact RYS-21 closes and the master station and slave station are connected.

These above-mentioned operations are instantaneous,
When the master station hears the response voice from the slave station, it releases the operation of the call switch 14. Call switch 1
4, the line is maintained as described above, and the voice of the master station is guided from the coil _l6 of the hybrid transformer circuit 3 to the transmitting circuit 5 and transmitted, and is reproduced by the speaker 48 of the slave station. The audio of the slave station is transmitted by the coil of the hybrid transformer circuit 3 of the master station.
l ₃ and played on the handset, you can talk freely to each other.

After the call is over, by operating the response switch 64 of the slave station again ( _T4 in Figure 10), the AND gate A17 is opened, flip-flop FF-9 is reset, and the transmission of the tone signal _f2 is stopped. Due to the disappearance of tone signal f ₂ , the first and second relays
As RY-1 and RY-2 become inoperable, the flip-flops FF-3 and FF-3 of the slave station line control circuit 25 become inoperable.
When FF-4 is reset by the pulse generation by the pulse generator 28 at the falling edge of the tone signal _f2 , the 4th and 7th relays RY-4 and RY-7S become inoperable and enter the initial state of reception standby. status will be restored.

In this case, if the slave station forgets the return operation, the connection between the master station and slave station remains in intercom mode, telephone 2 is cut off from the outside line by relay contact RYS-4, and the outside line is connected from the master station to the outside line. However, in that case, by closing the reset switch 41 of the master station, the tone signal _f5 is transmitted by driving the line use signal generation circuit 22, and the slave station generates a tone signal. By operating the one-shot multivibrator 67 upon detection of the signal _f5 , the flip-flop FF-9 can be reset and returned to its initial state as described above.

The above explanation was about calling a slave station from a master station, but next, regarding the operation of calling a master station from a slave station,
This will be explained with reference to FIG.

For calls from slave stations, switch to intercom switch 6.
This is done by closing operation 5. (1st
Figure 1 _T1 ). That is, when the intercom switch 65 is closed, the AND gate A18 is opened, and the flip-flop FF-10 is set.
The _f3 generating circuit 59 is driven, and the diode
By driving the transmission circuit 62 and tone signal f ₂ generation circuit 58 via D ₂ , tone signals f ₂ and f ₃ are generated.
is transmitted from the slave station. Tone signal from slave station
At the master station that has received f ₂ and f ₃ , the tone signal f ₂ detection circuit 16 detects the tone signal f ₂ and activates the OR gate.
By making the transistor _Q1 conductive through OR2 and exciting the first relay RY-1, the transmitting circuit 5
At the same time, the second relay RY-2 is energized to close the relay contact RYS-21 and connect the line. Furthermore, when the tone signal _f3 is detected by the tone signal _f3 detection circuit 17, the AND gate A2 is opened, and the fourth relay is connected via the OR gate OR3.
When RY-4 is energized, relay contact RYS-4 is switched to the B side and the external wire is disconnected as described above.
By opening the AND gate A12 of the calling signal control circuit 31, the calling signal generating circuit 30 is activated.
Speaker 3 is driven through OR gate OR4
2 generates a calling signal.

When the person at the master station notices the paging signal, he first closes the paging switch 14 to stop the paging signal when responding ( _T2 in FIG. 11), which opens the AND gate A11 of the paging signal control circuit 31. As a result, flip-flop FF-6 is set, AND gate A12 is closed, the calling signal generating circuit 30 stops operating, and the calling signal stops sounding. Since the relay contact RYS-22 is open at this time, the tone signal _f1 is not generated, and therefore, no calling signal is generated at the slave station. At the same time, AND gate A7 of slave station line control circuit 25 is opened, thereby setting flip-flop FF-3 and energizing seventh relay RY-7. 7th
By energizing the relay RY-7, the sixth relay RY-6 is made inactive, so that when the handset is picked up, the line with the slave station is connected and a conversation can be made.

After the call ends, switch the slave station's intercom switch 65.
By operating again (T ₃ in Figure 11),
AND gate A19 is opened and flip-flop FF
-10 is reset, the tone signal
When transmission of f ₂ and f ₃ is stopped, the first, second, fourth, and seventh relays RY-1, RY-2, RY- of the master station are
4, RY-7 becomes inoperable and returns to the initial state. At this time, when the tone signal _f3 falls, the pulse generator 36 of the calling signal control circuit 31 generates a pulse, and the flip-flop FF-6 is also reset to return to its initial state.

In this case as well, if the slave station forgets the return operation,
The communication between the master station and the slave station remains in the intercom mode, but by opening and closing the reset switch 41 of the master station as described above, the flip-flop FF-10 of the slave station is reset and the intercom mode is released. can do.

In addition, as mentioned above, if an incoming call is received on an outside line while talking with a slave station as an intercom, the relay contact
Since RYS-4 is switched to the B side, when the bell signal is guided to the second bell signal detection circuit 19, the photocell 35 turns on the transistor _Q9 ,
The output is guided to the calling signal generation circuit 30 via the OR gate OR4, whereby a calling signal is generated from the speaker 32. Therefore, the master station knows that there is an incoming call on the outside line. When the master station hears the paging 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 an outside line, the fourth relay RY-
4 is inoperative, the relay contact RYS-4 is switched back to the A side, and the outside lines L ₁ and L ₂ are connected to the telephone set 2, allowing communication with the outside lines.

Next, a case will be described 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-4 of the master station is switched to the A side, so that the telephone 2 rings with the bell signal, and when the bell signal is detected by the first bell signal detection circuit 15, the OR gate OR
1. At the same time, the first relay RY-1 is excited through OR2 and placed in the transmitting state, and the tone signal _f1 is generated by driving the tone signal _f1 generating circuit 12.
By transmitting f ₁ , the slave station can also know that there is an incoming call by the generation of a paging signal as described above.

The operation in the case where the master station and the slave station simultaneously confirm the incoming call and the master station responds will be described with reference to FIG. 12. When the master station picks up the handset, it can make a call to an outside line in the same way as a normal telephone.
By picking up the receiver at this time (Fig.
T ₂ ), the sixth relay is activated by the activation of the line connection detection circuit 21.
When RY-6 is energized, first the relay contact RYS-
61 is opened to cut off the line to the slave station, preventing the slave station from hearing the call between the master station and the outside line, and by closing relay contacts RYS-62 and RYS-63, the line to the slave station is cut off. Use signal tone signal _f5
Send. Therefore, when the slave station attempts to make a call to an outside line or an intercom call to the master station and closes the response switch 64 or the intercom switch 65, the OR gate OR1 is set by flip-flops FF-9 and FF-10.
2 to the AND gate A15, the detection of the tone signal _f5 causes the AND gate A1 to
5 is opened, the line use signal generation circuit 54 is driven, and the speaker 48 generates a line use signal, thereby informing the slave station that the master station is currently talking to an outside line. Also relay contact
When RYS-64 is opened, tone signal _f2 is transmitted by operation of response switch 64 of the slave station, AND gate A1 of the master station is opened, and the third relay
RY-3 operates to prevent the connection between the master station and the outside line from being disconnected due to the opening of relay contact RYS-31. Furthermore, by opening the relay contact RYS-65, the tone signal _f3 is transmitted by operating the intercom switch 65 of the slave station, the AND gate _A2 of the master station is opened, the fourth relay RY-4 is activated, and the relay contact RYS- 4 is switched to the B side, thereby preventing the master station and the outside line from being disconnected. In this way, when the master station is talking to an outside line, this is indicated to the slave stations, and no matter what operation the slave station performs, it does not affect the conversation of the master station. Incidentally, when the slave station operates the intercom, the detection of the tone signal _f3 drives the calling signal generation circuit 30 as described above, so that the master station knows that the slave station wishes to make an intercom call. . After the call ends, the initial state is restored by returning the handset (T ₃ in Figure 12).

In this way, it may be more convenient for an outside call received at the parent station to be received by a person at the slave station.
In that case, the data can be transferred to the slave station by notifying the other party and closing the transfer switch 26 (see FIG. 13). That is, when the transfer switch 26 is closed (T ₃ in FIG. 13), the hold control circuit 20
By opening AND gates A4 and A5,
5th relay with flip-flop FF-1 set
RY-5 is energized, and when relay contact RYS-5 is closed, external lines L ₁ and L ₂ are short-circuited by a predetermined impedance element Z, thereby setting the external lines on hold. At this time, the set output of flip-flop FF-1 is supplied to tone signal _f1 generating circuit 12 via diode _D1 and OR gate OR1, thereby transmitting tone signal _f1 . tone signal
Upon reception of f ₁ , the slave station activates the calling signal generation circuit 52.
is driven and a calling signal is generated from the speaker 48. When the person at the slave station notices the calling signal and operates the response switch 64 ( _T4 in Fig. 13), the slave station line control circuit 25 of the master station is activated by transmitting a tone signal _f2 .
AND gate A7 is opened and flip-flop FF-
3. By setting FF-4, the seventh relay RY-7 is energized and the sixth relay RY-6 is made inoperable, so that the relay contact RYS-61 of the sixth relay RY-6 is energized.
~RYS-65 is all returned to its initial state, and the intercom line with the slave station is connected (at this time, the second relay RY-2 is excited by the tone signal _f2 ,
Relay contact RYS-21 is closed. ), the relay contact RYS is activated by excitation of the fourth relay RY-4.
-4 switches to the B side. At this time, the AND gate A1 is not opened by the output of the slave station line control circuit 25, the third relay RY-3 is inactive, and the line of the master station is not disconnected. When the slave station responds in this way, it announces that it wants to transfer and closes the transfer switch 26 again ( _T3 in FIG. 13). When FF-1 is reset and the fifth relay RY-5 becomes inoperable,
Relay contact RYS-5 is opened and the hold state is released, and flip-flop FF-4 of slave station line control circuit 25 is reset, causing fourth relay RY-4 to become inoperable and relay contact RYS to be released.
-4 returns to the A side, the lines between the outside lines L ₁ and L ₂ and the slave station are connected. Further, when the fourth relay RY-4 is deactivated and the AND gate A1 is opened, the third relay RY-3 is energized, the relay contact RYS-31 is opened, and the line of the master station is cut off.
At this time, the flip-flop FF-7 is set in the reset circuit 37 by the operation of the transfer switch 26, so that the reset circuit 37 is not activated in response to the response from the slave station. After the call between the slave station and the outside line ends, close the response switch 64 of the slave station and send the tone signal f ₂
By stopping transmission, both the master station and the slave station return to the reception standby state. In addition, if the slave station does not respond when transferring to the slave station, by operating the transfer switch 26 again, the hold state will be canceled due to the inoperation of the fifth relay RY-5, and the master station and the outside line will be reconnected. .

Furthermore, when the transfer is made to the slave station as described above, if the slave station wants the master station to also hear the call, that is, wishes to make a three-way call, the slave station must This is possible by closing the intercom switch 65 (T ₅ in FIG. 14) and transmitting the tone signal f ₃ (see FIG. 14). That is, the master station maintains the line of the master station by not opening the AND gate A1 upon detection of the tone signal _f3 , thereby inactivating the third relay RY-3, and closing the relay contact RYS-31. It is something. Therefore, in the master station, after detecting the tone signal f ₃ and stopping the generation of the calling signal from the speaker 32 by operating the calling switch 14 as described above (T ₆ in FIG. 14), the transfer switch 26 is closed. When operated (Fig. 14)
T ₇ ), as described above, the slave station and the outside line are connected, and the master station is also connected, allowing the three parties to talk. At this time, the seventh relay RY-7 is kept in an excited state, so the sixth relay RY-6 is inactive and does not affect the line to the slave station.

Next, a case in which a slave station responds to an incoming call on an outside line will be explained with reference to FIG. 15. When the response switch 64 is closed ( _T2 in FIG. 15), the tone signal _f2 is transmitted by setting the flip-flop FF-9, thereby setting the master station to the transmitting state and also turning on the second relay RY-9. Relay contact RYS with excitation of 2
-21 is closed and the lines between the outside lines L ₁ and L ₂ and the slave station are connected, so that it is possible to talk to the outside line. At this time, when the AND gate A1 is opened, the third relay RY-3 is energized and the relay contact is
By opening RYS-31 and RYS-32, the line of the master station is cut off so that it cannot be heard by the master station, and the reset switch 4 is turned off while the slave station is talking.
1 is operated to prevent the slave station from being reset. In addition, when the third relay RY-3 is excited and the light emitting display element _P1 is turned on,
Informs the master station that the slave station is talking to an outside line. After the call is over, by operating the response switch 64 of the slave station again ( _T3 in FIG. 15), both the master station and the slave station are returned to the receiving state.

Next, if you want to transfer the call received at the slave station to the master station (see Figure 16), close the transfer switch 66 after telling the other party to that effect (see Figure 16).
T ₃ ) This is possible if the tone signals f ₃ and f ₄ are transmitted.
That is, in the master station, when the tone signal _f3 detection circuit 17 detects the tone signal _f3 , the ringing signal control circuit 31 is driven to generate a ringing signal from the speaker 32, and the third relay RY- is activated by closing the AND gate A1. 3 is inoperative and the relay contact
Connect the line of the master station by closing RYS-31. After receiving the call in this way, the master station operates the call switch 14 to stop the call signal (see Fig. 16).
T ₄ ), you can talk to the slave station by picking up the handset. At this time, when the flip-flop FF-1 is set by opening the AND gate A3 of the hold control circuit 20 by operating the call switch 14, the external lines L ₁ and L are energized by the excitation of the fifth relay RY-5. ₂ is set to pending status, and
AND gates A7 and A9 of slave station line control circuit 25
is opened and flip-flops FF-3, FF-4,
When FF-5 is set, the 4th and 7th relays RY
-4, RY-7 is excited. Therefore, the relay contact RYS-4 is switched to the B side, and the sixth relay RY-6 is made inactive, thereby connecting the line between the parent and child. The master station, which has been informed of the transfer during the conversation with the slave station, can talk to the outside lines L ₁ and L ₂ by closing the transfer switch 26 (T ₅ in FIG. 16). That is, first, flip-flop FF-1 of the hold control circuit 20 is reset (signals _S2 and _S4
When the fifth relay RY-5 becomes inoperable, the hold state is released and the flip-flop of the slave station line control circuit 25 is reset.
When FF-5 is reset, AND gate A10 is opened, flip-flop FF-3 is reset and seventh relay RY-7 becomes inoperable, and furthermore, when flip-flop FF-4 is reset, fourth relay RY-4 becomes inoperable. Outline by being made to work
The lines of L ₁ and L ₂ and the master station are connected and communication is possible.
At this time, the relay contact RYS-4 is of the shooting type, and the line will not be disconnected when returning from the B side to the A side contact. Also, line connection detection circuit 21
After the call ends, the sixth relay RY-6 is energized and the line to the slave station is cut off, and the receiver is returned to the reception standby state by returning the handset (Fig. 16).
_T7 ).

Also, when transferring from a slave station to the master station, if the master station wishes to make a three-way call in which the slave station also joins, close the transfer switch 26 and then close the transfer switch 26 again.
6 (see Fig. 17). That is, the first operation of the transfer switch 26 (first
At _T5 in Figure 7, the hold state has been released as described above, and by operating the transfer switch 26 again ( _T6 in Figure 17), the slave station line control circuit 25 is released.
AND gate A8 is opened and the flip-flop
FF-3 is set, the seventh relay RY-7 is energized, and the sixth relay RY-6 is made inactive, thereby connecting the slave station line and allowing three parties to talk. At this time, with the flip-flop FF-2 set
Since AND gate A5 is not opened, flip-flop FF-1 is transferred by operating transfer switch 26 for the second time.
is never set or placed in a pending state. If the master station does not respond even when the slave station transfers the data to the master station, the AND gates A7 and A9 will not be opened, so the transfer operation will be canceled and the call can be made to the outside line without affecting the master station in any way.

Next, the operation of calling an outside line from the master station or slave station will be explained. First, when making a call from the master station, you can make a call to an outside line by picking up the handset and dialing, just like with a normal telephone. At this time, the sixth relay is activated by the line connection detection circuit 21.
By energizing RY-6, the line to the slave station is cut off as described above, and a line use signal is transmitted to the slave station.

Next, when the slave station makes a call to an outside line, it first closes the response switch 64 and transmits the tone signal _f2 . 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 61.The tone signal _f2 is modulated according to the dial pulse, and the relay contact RYS-21 is modulated accordingly. is opened and closed, and dial pulses are sent to the outside line. When the other party answers, you can talk between the outside line and the slave station. At this time, by opening AND gate A1,
The third relay RY-3 is energized, disconnecting the line of the master station as described above, and notifying the master station that the slave station is currently talking to an outside line by lighting up the light emitting display element _P1 . After the call ends, by operating the response switch 64 again, both the master station and the slave station are returned to the reception standby state.

Next, the malfunction prevention device for the switch will be explained.

First, in the transfer switch 26 of the master station, as shown in FIG. 4, when the output signal _S2 of the line connection detection circuit 21 is not present, that is, when the handset is not picked up, the AND gate A4 is not opened. Even if the transfer switch 26 is operated in the reception standby state, the fifth relay RY-5 will not be energized and the outside line will not be put on hold. Further, the reset switch 41 is connected via a relay contact RYS-32, and the relay contact RYS-32 is connected to the slave station during a call.
By opening the reset switch 41, the slave station is prevented from being reset due to erroneous operation of the reset switch 41.

Next, in the case of a slave station, when the response switch 64 is operated, the outside line and the slave station line are connected as described above.
Careless manipulation must be prevented. In the present invention, if there is no dial operation within a predetermined time after the response switch 64 is operated, the dial is automatically returned to the standby state. That is, as shown in FIGS. 9 and 18, when the tone signal _f2 is present instead of the intercom mode, that is, when only the response switch 64 is operated,
The output of the timer circuit 39, which is started when the AND gate A13 is opened and generates an output pulse after a predetermined period of time has passed, opens the AND gate A14 and makes the transistor _Q8 conductive.
By energizing relay contact RYS-8, the line use signal tone signal _f5 is generated. When the slave station detects tone signal _f5 , it resets flip-flop FF-9 and enters the standby state. Set. Therefore, if there is no dial pulse within a predetermined period after the response switch 64 is operated, the reception standby state is automatically returned. However, when a slave station makes a call to an outside line, a dial pulse is always generated, so the falling edge of the dial pulse causes the flip-flop to
By setting FF-8, even if the timer output is generated, the AND gate A14 is not opened and the eighth relay RY-8 is inactive, so that the slave station can talk to the outside line without being reset. In this way, erroneous operation of the response switch 64 is prevented.

Next, if the intercom switch 65 is operated incorrectly, a calling signal will be generated at the master station and the person at the master station will be called, but when the person at the master station answers, the person at the slave station will not respond. The person at the master station will know that it is a malfunction, so in that case, reset switch 41.
This allows the slave station to return to the standby state. Furthermore, even if the transfer switch 66 is erroneously operated, the AND gates A3, A7, and A9 will not open unless the master station responds and generates the paging switch _S1 .
It is configured so that outside lines are not placed on hold.
It has no effect on the master station or outside lines. Also, when making a call to an outside line from a slave station or operating an intercom, if the master station is malfunctioning, the power of the master station is turned off, or the slave station is out of communication range with the master station, operate the response switch 64 or intercom switch 65. Even if the master station is not set to transmit state, the slave station will not receive the carrier wave from the master station.
When the output of the carrier wave detection circuit 55 disappears and the transistor _Q10 becomes non-conductive, the light-emitting display element _P4 lights up, indicating that the master station is malfunctioning or is out of the communication range.

Although the above explanation was for a pulse dial, it can also be applied to a tone dial by simply changing the pulse generating circuit 40 of the reset circuit 37 to change the pulse by detecting the tone frequency of the dial. .

As described above, the cordless telephone device of the present invention connects the slave station and the master station wirelessly, thereby enabling the slave station to communicate with an outside line via the master station, and allowing the slave station to respond to incoming calls from the outside line. Even in such a case, the data can be transferred to the master station by simply operating the transfer switch, which has an extremely large practical effect.

[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. 4 shows the configuration of the hold control circuit, FIG. 5 shows the configuration of the line connection detection circuit, FIG. 6 shows the configuration of the slave station line control circuit, and FIG. 7 shows the configuration of the slave station line control circuit. 1. A diagram showing the configuration of the second bell signal detection circuit; FIG. 8 is a diagram showing the configuration of the calling signal control circuit; FIG. 9 is a diagram showing the configuration of the reset circuit; FIGS. 10 and 11; Figure 12, Figure 13, Figure 14, Figure 15
16, 17, 18, and 19 are time charts for explaining the operating states of the master station and slave stations. 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
...Tone signal _f3 detection circuit, 18...Tone signal
f ₄ detection circuit, 19...Second bell signal detection circuit, 2
0... Hold control circuit, 21... Line connection detection circuit, 22... Line use signal generation circuit, 25... Slave station line control circuit, 26... Transfer switch, 30...
... Call signal generation circuit, 31 ... Call signal control circuit, 37 ... Reset circuit, 41 ... Reset switch, 42 ... Receiving section, 43 ... Transmitting section, 4
9...Tone signal _f1 detection circuit, 53...Tone signal _f5 detection circuit, 58...Tone signal _f2 generation circuit,
59...Tone signal _f3 generation circuit, 60...Tone signal _f4 generation circuit, 61...Dial pulse generation circuit, 64...Response switch, 65...Intercom switch, 66...Transfer switch.

Claims (1)

[Claims] 1. In cordless telephone equipment, which consists of a master station connected to a telephone line and equipped with a transceiver, and a slave station connected wirelessly, the slave station is connected to an outside line via the master station. A means for setting a phone on hold, a means for canceling the hold state, a means for notifying a call from a slave station, and a means for forming a line between the telephone of the master station and the slave station. A means for transmitting a control signal to call the station is provided, and after the slave station responds to an incoming call on an outside line, a control signal for calling the base station is sent to the master station by a transfer operation to the master station, and when the base station responds, the outside line is terminated. A cordless telephone device characterized in that a line is formed between an outside line and a telephone of the master station by setting the phone to a hold state and releasing the hold by the master station.