JP2554647B2 - Cordless phone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cordless telephone in which a base unit has various kinds of control functions, and the functions can be controlled by a handset unit. Paying attention to the fact that the dial function of the cordless handset is idle, the various control functions of the handset are operated from the cordless handset to switch to the function of the answering machine or the contents of the telephone being absent are recorded. You can listen to it on the machine, open or close the door of the garage, blink the light, etc., or attach multiple slaves so that you can talk between the slaves via the master, or a slave By making it possible to transfer the phone call to other cordless handsets, etc., the cordless phone was designed to be used for various other purposes instead of the conventional length for phone use. It is a thing. That is, the conventional cordless telephone is
Since the child machine / machine was used, if the person who has the child machine is at the poolside, bathhouse, toilet, etc. It was difficult to call, and sometimes there was the inconvenience of not being able to call. In the present invention, a plurality of cordless handsets are attached to the parent device, and in such a case, by providing means for transferring a telephone to another cordless handset, the above drawbacks are eliminated, and When not making a call to an external telephone, the efficiency of the telephone is measured by making it possible to communicate and make a call between the handset units, and the dial signal of the base unit and the handset unit are always available. Since the sending device is also playing,
By providing various control devices on the main unit and controlling it with various signals by a complicated combination of dial numbers on the slave unit, it is possible to control the opening and closing of the garage door and various other purposes. It is possible to make the cordless telephone more effective. In addition, by making the operation of all the base units controllable from the handset units, the base unit can be placed at a high place that is out of reach, so it is possible to extend the range of radio waves. You can do it, and if you store it in a closet, you can save the installation place and eliminate the trouble of code etc. Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a connection diagram of the master unit, and the power supply circuit is the same as the known one, and is therefore omitted. In the figure,
Reference numeral 32 is an antenna for transmission / reception, 1 is a high frequency amplifier of a receiver, 2 is a detector, 3 is a low frequency amplifier, 4 is a wired / wireless coupling circuit, 112 is a connection terminal to a commercial telephone line, 31 is a telephone line. Contacts of relay 13, 5, 6, 7, 8, for disconnecting
Are signal selectors that generate outputs only in response to specific signals, and narrow band wave detectors, phase detectors, and other well-known devices can be used. 10 is a variable oscillator, the signal selector 5 operates, the output circuit is short-circuited,
Alternatively, when the collector circuit of the transistor 14 is short-circuited, it oscillates at a frequency of f1 (for example, 600 Hz), supplies its output to the modulator 29 of the transmission section, and when the signal selector 6 operates, f2 ( 800Hz), f3 (1 when the signal selector 7 operates
200 Hz) and supplies respective outputs to the modulator 29, 18 is a detector for a ringing signal from the telephone line 112, and 19 is a discharge signal which operates in response to a high-voltage ringing signal. The electric device, 20 is a resistor whose resistance value changes in accordance with the discharge light of the discharge device, and the transistor 15 changes its collector potential in accordance with the fluctuation of the resistance value of the resistor 20,
The collector circuit of the transistor 14 is opened and closed.

Reference numeral 11 is a drive circuit for the relay 13. When the output of the squelch circuit 9 is a positive voltage, the relay 13 operates and closes its contact circuit 31, and when the signal selector 8 operates, the relay is restored. It is designed to open 31, so that dialing similar to that of a so-called telephone can be performed. Reference numeral 22 is a self-holding circuit, which starts operation when the specific signal detector 21 operates for a short time and the output of the squelch circuit 9 is input at the same time, and maintains the operation even after the output of 21 is stopped. However, the output of the squelch circuit 9 disappears and is restored. 23 is a power supply circuit that supplies power during the operation of 22, and 24 is the squelch 9 operating independently. It is a power supply circuit that is designed to supply power, and is used to supply power when a call is made between handset units regardless of the telephone line by the press talk method. is there.

Figure 2 shows the connection diagram of the slave unit, 33 is an antenna for both transmission and reception, 34 is a high frequency amplifier in the receiving section, 35 is a detector 36 is a low frequency amplifier, 37 is a speaker for the receiver, 38 is the end band. It is a frequency selector such as a wave detector or a phase detector, and a publicly known one can be used. 41 is a switch using a transistor, 38 is according to the output,
It opens and closes 36. Switch 45 is on standby (S
B), press talk call (PT), call (switch for switching to three kinds of TK, diodes 43 and 44 are for controlling the transistor 41 and operating the low frequency amplifier 36, respectively. 46 is a push-button type switch for making a press talk call, 49 is a specific signal generator, and the changeover switch 45 activates by a click generated at the moment when the power is connected, and a specific signal is generated for a short time. As shown in Fig. 1, the control circuit under the specific signal detector is operated and 57 is operated to generate a signal for dialing, which is an ordinary push button type telephone. Just like
A pulse signal having the same length as the number displayed on the button is sent to control the variable oscillator 54, and the frequency selector 8 of FIG.
Is to intermittently oscillate at a frequency equivalent to. Five
5, 55 ', 56 and 56' are push button type switches for calling the slave unit (C) and the slave unit (B), 53 is a microphone for transmission, 52 is a low frequency amplifier, and 51 is a modulator. And 50 is a high frequency power amplifier. As shown in FIG. 1, when a ringing signal appears on the commercial telephone line 112 in FIG. 1, the resistance value of 20 changes according to the signal. Then, the base voltage of the transistor 14 is changed, and the collector circuit thereof is configured to be opened and closed according to a signal. Also, accordingly
Variable oscillator 10 is preset f1 (600Hz)
Then, oscillation and stop are repeated according to the signal, and the output is supplied to the modulator 29. On the other hand, the current flowing through the transistor 15 passes through the diode 27 and is supplied to the power amplifier 28. Thus, the radio wave modulated by the calling signal is transmitted to the antenna. To the example of the child machine, A shown in Fig. 2
In the machine, since the switch 45 is normally in the standby state, that is, in the position of SB shown in the figure, no voltage is applied to the base of the transistor 41, and accordingly, the low frequency amplifier 36 is opened. Therefore, no signal sound appears on the speaker 37. When a signal radio wave as described above with reference to FIG. 1 is received, the ringing signal sound that passes through 34 and is detected at 35 and is an intermittent sound of 600 Hz is added to 38. 38 is a controller configured so that its output terminal is short-circuited only when a set signal arrives. In response to the ringing signal, 36 operates and the ringing applied to its input side is performed. The signal is amplified and activates the speaker to indicate when a call is coming from the telephone line. On the handset (A) that received the call, the changeover switch 45
In the call position (TK in the figure), power is first applied to the base of the transistor 41 through the diode 44, and the collector circuit is short-circuited to activate the low frequency amplifier 36. Further, the power source is added to the power amplifier 50 through the diode 48 to emit a transmission radio wave. The click generated at the moment when the contact of the switch 45 is placed at the position of TK causes the specific signal generator 49 to operate, and its output causes the variable oscillator to intermittently oscillate according to the signal. This signal is also emitted by riding on the radio wave as described above.
In FIG. 1, when this radio wave is received, a specific signal emitted from the handset A (generally represented by f7, but for the sake of convenience of explanation, a concrete number of 5 and 6 KHz will be explained below. ) Is demodulated to operate the specific signal detector 21. Only when the output of the specific signal detector 21 and the output of the squelch circuit 9 (SQ) that operates due to the presence of the received radio wave are present at the same time, the self-holding circuit 22 and the power supply circuit 23 operate, and the output current is It flows through the diode 26 to the transmitter 28 and emits a radio wave. After the operation is started, the self-holding circuit 22 continues to operate even after the output of the specific signal detector 21 is stopped, the reception radio wave disappears, the output of the squelch 9 is stopped, and then the self-holding circuit 22 is restored for the first time. Stop the power supply.
As described above, in this state, both the master unit and the slave unit are in operation, so the slave unit is the microphone 53 and the speaker 37.
Therefore, you can make a call in the same way as an ordinary phone. In this case, it is necessary to set the transmission frequencies of the master unit and the slave unit to frequencies that do not interfere with each other. When the call is started in response to the call of the telephone line and the calling party is the handset B instead of the handset A, a continuous switch for calling the handset B in the handset A in FIG.
When 56, 56 'are pressed, the variable oscillator 54 is
Oscillation of 3,9KHz (generally displayed as f5, but here, we will proceed with explanation using concrete numbers.) The signal selector 5 is operated, and the output thereof causes the variable oscillator 10 to oscillate at 800 Hz, and this signal is emitted along with the radio wave of the master unit.
In the handset B, only the selected frequency of the frequency selector 38 in FIG. 2 is different, and it is 800 Hz, and the others are configured exactly the same as in FIG. 2, so the case of FIG. 2 will be described. The low-frequency amplifier 36 operates in the same manner as described above, and an 800 Hz ringing tone can be heard. Switch 45
When in the call position, handset B can talk to the other party of the call. However, in the above operation process, in the slave unit A, the radio wave emitted by the master unit is directly received by the receiving unit of itself, and the received sound circulates into the microphone of the own unit, causing howling. I have fear. The diode 115 and the transistor 42 provided in FIG. 2 start the transmission when the power supply circuit operates, and at the same time, ground the base voltage of 41 and stop the operation of 36, which is annoying as above. It is provided to remove the roughness.

When an arbitrary telephone is called from the handset A through a commercial telephone line, the changeover switch 45 is first set to the call (TK) position, and an ordinary dial not shown in the dial signal generator 57 is provided. I arranged it like a push-button phone,
If you press the button according to the number of the telephone number you want to call, an intermittent signal corresponding to that telephone number will be sent,
In response to this signal, the variable oscillator 54 switches on and off the 5 and 6 KHz (f7) signal, and the signal is transmitted by transmitting the signal on the radio wave. In the master unit shown in Fig. 1, the signal is detected and the signal is selected. The dial signal is sent to the line by passing through the device 8 and operating the drive circuit 11 to open and close the relay 13, and thus the switching circuit 31 thereof. Thus, you can call the person you want, just as you would on a regular phone. When there is no call from the commercial telephone line, when the handset A calls the handset B and wants to talk, a call is made to place the switch 45 at the press talk (PT) position and call the handset B. Switches 56, 56 ',
If is pressed, the cordless handset B is called in the same manner as described above, and since the power is supplied to the transistor 41 through the diode 43, the low frequency amplifier 36 is in the operating state, You can hear the response through the speaker 37. When talking from handset A, press talk switch
When 45 is pressed, power is supplied to the transmitter through the diode 47, so that the microphone 53 can be used for transmission.
In this case, if the slave unit B and the slave unit B are in the transmitting state at the same time, the receiving unit of the master unit receives two radio waves at the same time, which causes a problem, so that the transmitting unit operates only during transmission. ,
This is a so-called press talk system. Also, the sound of the user's own voice passes through the receiver of the base unit and is sent from the transmitter, and it is annoying to be received by the receiver of its own, so it is necessary to stop the receiver of its own during transmission. is there. The circuit provided for this purpose is a circuit of the transistor 42, which is designed to open 36 by grounding the base of the transistor 41 by the power supply for transmission. In addition, when the cordless handset A calls the cordless handset B and wants to make a call, just when the cordless handset B is in a call, carelessly emitting a radio wave can prevent the call. The squelch circuit 39 shown in Fig. 2 is provided to prevent such inconvenience.
And the light emitting diode 40. That is, when any one of the slaves is in a call via the master, the squelch circuit 39 is operating because the master always emits a radio wave. Therefore, when the squelch circuit is operating, if the circuit is configured so that the light emitting diode is ignited, it is possible to know that the line is busy.

FIG. 3 shows an example of a concrete control circuit of the variable oscillator 10, the relay drive circuit 11, the self-holding circuit 22, and the power supply circuit 23 shown in FIG.
And resistors 64, 6 connected between its collector and base
5, 66, 66 ', capacitors 67, 67', variable resistors 68, 6
Reference numerals 9 and 70 form the oscillation circuit 10. When the collector circuit of the transistor 14 is short-circuited, the variable resistor 70 is grounded through the diode 73 and the emitter of the transistor 62 is grounded through the diode 76, and the circuit oscillates, and the oscillation frequency is variable. Adjusted by a resistor 70, the figure shows an example of 600Hz
Shows the case of oscillating. When the 4,7 KHz signal comes in, the output end of the signal selector 5 is grounded, and similarly, the oscillation of 600 Hz is caused. Similarly, when a signal of 3,9 KHz comes, it oscillates at 800 Hz, and in the case of a signal of 3,2 KHz, it oscillates at 1200 Hz. When a 5 or 6 KHz signal is received, the base of the transistor 12 is grounded through the diode 19, the relay 13 is restored, and the contact circuit 31 (not shown) is opened. When there is no 5 or 6 KHz signal, the relay 13 is operating due to the + input of the squelch circuit and the supply of power. The + output of the squelch circuit 9 is applied to the base of the transistor 82, keeping its collector side short-circuited. When a + signal appears at the output of the specific signal detector 21 in this state, a collector current flows in the transistor 81, the base potential of the transistor 85 becomes a negative value with respect to the emitter, and the collector current flows in 85. Is supplied to the transmitter 50, but at the same time, since it is added to the base of 81 through the resistor 110, the power supply circuit 85 continues to operate even after the output of 21 is stopped, and the reception radio wave is received. Stop and squelch 9
The operation of the transistor 82 is stopped only when the + output of the signal is lost and the transistor 82 is opened.

As mentioned above, in the slave unit shown in FIG.
When the press talk switch (PT) is pressed and the press talk switch 46 is pressed, no specific signal is sent, so only radio waves are emitted, so as shown in FIG. Output appears only in squelch 9,
Only the power supply circuit 24 operates and the transmitter operates. That is,
The transmission unit of the master unit is controlled according to the disconnection of the press talk switch 46 of the slave unit, and a call can be performed between the slave units via the master unit by the press talk method. I can. In this case, the signals, voice signals, etc. appearing in the receiver of the master unit must be transmitted to the low-frequency amplifier of the transmitter as they are, but in this case, the relay operates on the telephone line. Since it is not, it is opened by the contact 31. That is, the secondary side of the matching circuit 4 has no load,
Since there is no matching, most of the output of the receiving unit will flow to the input side of the transmitting unit, and in practice no special measures are required, but even in this case When the volume to the transmitter is insufficient, an auxiliary circuit as shown in Fig. 4 can be used. The drawing shows only a part of the first drawing, and the symbols of the respective parts are the same as those in the first drawing. In the figure, the output end of the low-frequency amplifier 3 and the input end of the low-frequency amplifier 30 of the transmitter are connected to a condenser.
Since it is connected via 91, resistors 89, 90, the volume from the receiving part to the transmitting part can be freely selected, and in the case of a call with a normal telephone line, a specific signal The detector 21, the self-holding circuit 22, and the power supply circuit 23 operate, and the collector circuit of the transistor 94 short-circuits the resistors 89 and 90. There is nothing that hinders us. Further, in the case of the child-child communication, since the power is supplied from another circuit as shown in FIG. 1 and described, the transistor 94 does not operate.

FIG. 5 shows an embodiment of the variable oscillator 54 shown in the block diagram of FIG. In the figure, a transistor 89, resistors 90 to 99, a capacitor 94,
96 and 105 form an oscillation circuit. Variable resistors 97, 9
8 and 99 are the oscillation frequency f5 (eg, 3,9KHz) f4 (4,7KH)
z) It is for adjusting the frequency of f7 (5,6KHz).
Now, when the switch 56 for calling machine B is closed, the emitter of 89 and 98 are grounded by the diode 101, and the variable oscillator 54 oscillates at 4,7 KHz. At the same time, the power circuit 61
The base of the transistor of is grounded by the diode 104, and a current will flow in the collector circuit of 108,
The following operation is as described with reference to FIG. The same is true when the dial signal generator 57 operates and its output end is grounded, but in this case, depending on the signal, 57
Since the output terminal of is repeatedly grounded and opened, oscillation of 5,6 KHz will be interrupted depending on the situation.

In the embodiment of the present invention shown in FIG. 1, the power supply circuit 23 of the master unit operates so as to be connected to the external telephone line only when a specific signal is issued from the slave unit. Yotsutte
It is designed to prevent others from stealing their own telephone, but for that reason, after receiving the specific signal and operating the power supply circuit 23, the power supply is continued until the output of the squelch circuit is stopped. However, in this system, if the electric wave is cut off for a short time due to some reason, the power supply circuit is restored and the system does not operate unless the specific signal comes again. FIG. 6 shows another embodiment of the present invention designed to eliminate such defects. In the figure, a specific signal for stopping is transmitted even when the call ends.

In the figure, 139 is a specific signal detector for stopping, its output is normally +, the collector side of the transistor is short-circuited, and the operation of the self-holding circuit and the power supply circuit is Although not supported, when the termination signal comes, the positive output of 139 disappears, 115 is opened, and the self-holding operation is restored.

Further, in FIG. 1, when, for example, 3,9 KHz is transmitted from the slave unit A, the master unit converts the value to 800 Hz and calls the slave unit B. Shows an example in which the device is simplified by directly sending the call signal 800Hz from the slave unit instead of the above two-step control system. In the base unit, the received 800Hz signal,
The capacitor 91 and the resistors 89 and 90 are directly connected to the amplifier 30 of the transmitter. In the figure,
The control circuit consisting of transistors 94, 117, 118, 119 makes 94 open and 117 short-circuited when calling between slaves and handsets, and reverses short-circuiting 94 and 117 open during normal call. , It does not interfere with the call.
Also, the signal selector in the figure (for example, 4,7KHz) is a ringing signal 800Hz.
It is provided to detect the 4,7 KHz signal sent at the same time and perform the above-mentioned opening / closing operation. FIG. 7 shows a circuit diagram of the slave unit corresponding to FIG. The specific signal transmitter 49 issued at the start of the call is the same as that shown in FIG. 1, but the specific signal transmitter sent at the end of the call is
Shown at 126. It is designed to start when the changeover switch 45 is switched to the standby (SB) position shown in the figure, that is, at the moment when the power is cut off, by the reverse current generated by the capacitor. Therefore, it is necessary that the transmitter continues to operate for a short time even after the power is turned off. The resistance provided for this purpose is shown in Fig. 7.
This is a delay circuit composed of 129, 130, a transistor 131, and a diode 128. That is, even after the power is turned off by the switch 45, for a short time, the transistors 131 and 142 continue to operate due to the discharge of the capacitor 130, so that the power is supplied through the diode 58,
During that time, a specific signal for stopping will be transmitted to the master unit. The delay oscillation circuits 54, 125, and other circuits and operations are the same as those shown or described in FIGS. 2, 3, and 5, and therefore will be omitted.

FIG. 8 and FIG. 9 show an embodiment of the present invention in which the stop signal is transmitted and the stop circuits 126 and 139 are abolished in the system shown in FIG. That's what it was. The start signal from the slave unit, which is sent in the form of intermittent 5 and 6 KHz, is detected by the signal selector 8 and the specific signal detector 21, and the output for control as described above is used. The self-holding circuit 22 and the power supply circuit 23 operate. When a signal from the dial signal generator 57 is sent from the slave unit in this state, the output of the signal selector 8 in FIG. 8 is intermittent,
The relay 13, and thus its contact circuit 31, is opened and closed to send a dial signal to the telephone circuit 112. However, in the above case, when a specific signal for activation is applied to the signal selector 8, a similar signal appears at its output side, but this signal is fast and extremely short, so the relay 13 never works. The subsequent operation is as described in FIG. If you want to transfer the call from the cordless handset A to the cordless handset B, please use the cordless handset
Since the 0 Hz signal and the 800 Hz signal are sent at the same time, the 800 Hz signal is transferred as it is from the detector 3 of the receiving section to the amplifier 30 (not shown) of the transmitting section through the circuit shown in the figure. At the same time, the 5,6 KHz output is applied to the transistors 117 and 119 to open the transfer circuit and ground the communication circuit, as described in detail in FIG. Further, the power is supplied from 24 by the operation of the squelch circuit, as described above. Further, it is clear from the explanation made with reference to FIGS. 1 and 2 that the call can be carried out between the slaves by using the press talk system. FIG. 9 shows only the signal transmission part of the slave unit, and other parts are the same as those shown in FIG. That is, when the slave unit B is desired to be called, when the calling switch 56 is closed, the low frequency variable oscillator 125 oscillates at 800 Hz and its output is applied to the modulator 51 as in the case of FIG. To be On the other hand, the 5,6 KHz oscillator 54 is
Oscillation occurs when its starting end is grounded by the diode 137, and its output is also added to the modulator 51. Thus, both 800 Hz and 5,6 KHz signals are transmitted and received by the receiver of the master unit, and the subsequent operation is as described in the case of FIG. FIG. 10 shows an embodiment of the present invention in which a master unit can call an arbitrary slave unit.
The figures show only a part of the first and third figures and omit the others. That is, when calling the slave unit A, the output end of the signal selector 5 is grounded by the switch 143, and the variable oscillator 10
Causes oscillation of the frequency of 600 Hz for calling the slave unit A, as described above. At the same time, the switch 143 ′, which is configured to work with the switch 143, allows the transistor 15
The base of is grounded, as explained in Fig. 1,
Power is supplied to the transmitter through the diode 27, and the slave unit A can be called as described above. If the base unit is provided with a transmitter / receiver device for an interphone, it is possible to make a call between the slave unit (A) and the base unit. As a method of using the master unit as the interphone device, various known ones can be used, and therefore the details thereof are omitted here. Regarding Figures 1 and 2, 10
~ As described on page 11, when a call is made to the handset (A), the handset (A) calls the handset (B) to transfer the call to the handset (B). There is no way to confirm that (A) has answered the phone. However, when the radio wave is emitted from the child machine, the parent machine receives the radio waves from the child machines (A) and (B) at the same time, and is transmitted to the child machine (A). Since a complex sound is received by the slave unit (A), the slave unit (A) is only unduly aware of the fact that the slave unit (B) has answered the telephone, which is very uncertain. It is ideal that the child machine (A) and the child machine (B) talk to each other and then transfer to the child machine (B). In this case, the child machines (A) and (B) press the same. When a call is made by the talk method, both of them may be in the standby state, that is, in the receiving state during the call, the radio wave to the master unit is interrupted during that time, and the output of the squelch 9 shown in Fig. 1 stops. Self-holding circuit 22
However, the relay was restored and the call line was cut off. In order to eliminate this defect, as shown in FIG. 6, a specific signal transmitter 126 for stopping and a receiver 139 may be used, but as mentioned above with reference to FIG. Since it is transmitted at the same time that the radio wave is cut off, it does not solve the problem that occurs in the case of transfer.

FIG. 11 shows an embodiment of the present invention for solving such a problem. The figure shows a wiring diagram of the master unit, and parts other than those shown are the same as in FIG. In the figure,
The signal transmission is omitted because it can be easily implemented by a method similar to that shown in FIGS. 2, 5, and 7.

In the figure, a power supply circuit 148, a self-holding circuit 149, a line holding specific signal detector 146, and a release specific signal detector 14
7 is a new addition. That is, a call from the external commercial telephone lines, if you want to briefly hold, when transmitting a specific signal for line retaining than handset, 146,14 _9, 14 _8, operates, the relay 13, is activated The contact 31 (not shown) is closed to hold the line. This operation is not affected by the stop of the radio wave at all, and during that time, a call such as calling another child device or a meeting by the press talk system can be performed. After the transfer to the other slave unit is completed, when the release specific signal is transmitted from the slave unit, the self-holding circuit 14g is restored and the power supply to the relay 13 is stopped, but at this time, already, Since the relay 13 is operated by the signal from the other handset, there is no problem in making a call, and it is possible to eliminate the inconvenience that occurs during the transfer as described above. As shown in FIG. 6 and FIG. 7, the slave unit (A) issues a signal for calling the slave unit (B) from the slave unit (A), and the slave unit (B) passes through the master unit as it is. ) Is compared with the method of transmitting the call signal from the slave unit to the call signal of the slave unit (B) as shown in FIGS. 1 and 2. In the system shown in FIG. 1, the signal selectors 5, 6, 7, 8 and the ringing variable oscillator are used.
Although 10 and are required, in the slave unit, only one variable oscillator 54 is required, which is effective in simplifying the slave unit, but on the other hand, the control frequencies f4 to f6 are too low. When approaching the voice frequency, the noise is not attenuated by the low-frequency amplifier 3, the matching circuit 4, and the telephone line, and reaches the other party's telephone, which is troublesome. In such a case,
You need a simple low pass filter.

As the number of slave units increases, the number of signal selectors also increases, which becomes a problem, but if a narrower band can be obtained at a small size and at a low price, the control frequency will be higher. It can be set. Alternatively, a digital type can be used depending on the shape and price. On the other hand, in the case of FIG. 6 and FIG. 7, a control circuit for controlling the low frequency amplifier 3, which requires only two signal selectors 5 and 8 in the master unit.
140, and in the slave unit, the signal oscillator for calling 1
25 and a control variable oscillator 54 are required,
Further, since the signal from the slave unit (A) passes through the master unit, there is a drawback that noise increases. FIG. 12 shows an embodiment of the present invention in which a master unit is provided with a multipurpose controller 155. In the figure, the child machine that receives a call from the external telephone line can be specified from the child machine side. The parts not shown are the same as those in FIG. 1 and therefore omitted. That is, in FIG. 1, when a high-voltage ringing signal arrives at the telephone line 112, as described in FIG.
The collector side of 4 repeats grounding and opening according to the signal, and the variable oscillator 10 repeatedly oscillates and stops at f1 (600Hz) depending on the signal, and the slave unit A (shown in FIG. 2 is shown. Will be called. Therefore young transistor 1
If the collector of 4 is connected to the output terminal of the signal selector 6, the signal of f2 (800Hz) will be sent from the master unit and the slave unit B will be called. The child device C is called. The controller 155 shown in FIG. 12 is designed such that the operation can be performed electronically and in response to a signal from the slave unit. That is, in the figure, when the slave unit sends a signal based on a predetermined combination of dial numbers on the carrier frequency f7 (5,6 KHz) and sends it, the multipurpose controller 155 detects that it is predetermined. Depending on the signal, the telephone line signal is output to terminals 152, 153, 15
Transmit to either of the four. In this case, the carrier wave f8 (5,6KHz) was used to transmit the dial signal of the slave unit, because if a DC rectangular wave can be used as it is, the waveform will not be distorted during transmission. Is. In addition, multipurpose controller 155,
The detailed internal structure of the above is omitted because it can be easily realized by a known electronic technique. In addition, the Ichisai calling method, in which each slave unit is sequentially called from the telephone line at intervals of several seconds, can be easily performed, and even if the calling oscillators are subordinated to the signal selectors 5 to 7, the telephone line can be used. It is clear from the above explanation that each child machine can be called to Ichisai. In the same manner, by changing the combination of dial numbers from the slave unit, an output is produced at any terminal in the output terminal group 157, according to the signal,
Or, it can cause changes such as open and short circuit,
This change is used to operate various devices, or
Since a complicated switching operation can be performed by operating the relay, it is possible to give the base unit the function of an answering machine, or to enable the handset to hear the recorded contents. It is also possible to do so, or to switch to the function of the interphone so that it is possible to talk between the guest at the entrance and the cordless handset, and other known techniques such as opening and closing the door and blinking the light Since it can be easily realized, its details are omitted. In addition, depending on the signal from the slave unit, another signal (not shown) is transmitted from the master unit so that only a specific slave unit is switched from the standby state to the call state for several seconds. For example, if this child machine is placed in a child's room or a baby's room, the child's room or baby's room can be known by the child machine. As a measure for switching the slave unit from the standby state to the transmission state by the signal from the master unit, various known ones are used, but for example, a delay circuit as shown in FIG. 7 is used. It can be used.
The figure shows that transmission is maintained for a certain period of time after the power supply is stopped, but it is sufficient to continue supplying power to the transmission unit for a certain period of time after the specific signal stops the above operation. Is.

As described above and shown in the drawings, the present invention has a master unit that is connected to a commercial telephone line and has a wireless transmission and a wireless receiver, and, correspondingly, a wireless transceiver that can transmit and receive. In the so-called cordless telephone, which enables transmission and reception with an external commercial telephone line using the wireless line via the master unit, a plurality of slave units are attached to the master unit / unit. , By a signal from any slave in the slave,
By operating the controller in the base unit, by providing a means for transmitting a signal or a voice signal to any other handset, a call that came to one handset can be sent to another handset. It is possible to transfer and call the desired slave unit, and by the press talk method, it is possible to talk between the slave units via the master unit, and even when the call partner is different, the master unit It is possible to eliminate the inconvenience caused by the cordless telephone because you do not have to go to the installation location of the other party or the place where the other party is, and the dial function of the cordless handset calls the telephone number. Focusing on the fact that it is used for a long time and is always playing, in order to measure its activation, a multi-purpose controller is installed in the parent machine, and each terminal is connected by a signal from the child machine by combining dial numbers. By generating the output to
It can perform various functions. That is, in the above-described embodiment, only a specific handset can answer a call from the telephone line, but a handset that can answer in this way is
It can be changed arbitrarily by the signal from the slave unit, and by adding the ringing oscillator to the master unit,
It is possible to call each cordless handset to Ichisai from an external telephone line, and by using it together with a tape recorder, the signal from the cordless handset can be used to switch the base unit to an answering machine and record it. It is possible to listen to the contents on a cordless handset. It can also be used for switching to the intercom function,
Alternatively, it can be used for a variety of purposes such as a monitor for a child's room, opening and closing a garage, blinking lights, etc. Also, since all functions of the master unit can be controlled from the slave unit,
The base unit can be placed in a manuscript location that is out of reach, the radio wave transmission distance can be extended, and the base unit can be stored in a place where it does not get in the way, for example, in a door. Therefore, the troublesomeness associated with the installation of the telephone can be eliminated. As described above, the present invention is capable of fully exerting the function of a cordless telephone, and its practical value is extremely large.

[Brief description of drawings]

Figure 1, Figure 2, Figure 4, Figure 6-Figure 9, Figure 11,
FIG. 12 shows a connection diagram for implementing the present invention, and FIGS. 3, 5, and 10 show connection diagrams for partially implementing the present invention.

Claims (9)

(57) [Claims] 1. In a cordless telephone having a plurality of cordless handsets, a signal from the cordless handsets activates a control means of the parent device to send out a predetermined signal from the parent device. A cordless telephone characterized in that a particular handset is switched from a standby state to a call state. 2. The cordless telephone according to claim 1, wherein a delay circuit composed of a resistor and a transistor is used to switch the other specific slave unit from the standby state to the talking state. 3. A slave unit for transmitting a specific signal to a master unit when a changeover switch is set to a call state in response to a calling signal, and a squelch circuit, and the specific signal and the output signal of this squelch are present at the same time. The cordless telephone according to claim 1, further comprising: a master unit that operates the self-holding circuit and the power supply circuit only and holds the power supply when the squelch signal is continuously detected. 4. The cordless telephone according to claim 1, wherein a telephone call is made between the slave units via the master unit. 5. The cordless telephone according to claim 1, wherein the cordless telephone is lit by the light emitting means when the cordless handset is in a call. 6. The cordless telephone according to claim 1, wherein a signal for stopping is transmitted at the end of the call. 7. The cordless telephone according to claim 1, wherein a specific slave is called from the master to perform an intercom call. 8. The slave unit and the other specific slave unit before the external telephone call is transferred from the slave unit to the other specific slave unit by sending a specific signal for holding the line from the slave unit. The cordless telephone according to claim 1, wherein a telephone call is made between the cordless telephones. 9. The cordless telephone according to claim 1, wherein the slave unit sends a signal based on a preset combination of dial numbers to the master unit.