JP2979056B2 - Cordless telephone with interphone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone with an interphone having an interphone function.

[0002]

2. Description of the Related Art In a conventional interphone device, when a ringing tone is heard, the user walks to a parent device and communicates according to a press talk system.

[0003]

However, in the above-mentioned conventional interphone device, when it is not possible to walk to the base unit, for example, during bathing, etc., it is impossible to respond and it is far away. The same result occurs when no ringing tone is heard, and such an obstacle has a similar problem in a commercial telephone.

[0004] The present invention solves the above-mentioned conventional problems, and provides an excellent interphone that allows a user to hear a ringing tone and answer a call immediately, regardless of where the user is, while always carrying the handset. It is intended to provide an attached cordless telephone.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a cordless telephone with an interphone, a base unit connected to a telephone line and having a radio transceiver, and a radio transmission / reception compatible with the base unit. A cordless telephone having a handset and a handset capable of transmitting and receiving via the base unit via the base unit, wherein the handset receives a call from the interphone device during a call with the phone line. Detecting means for detecting, and a notifying means for notifying the slave unit of an incoming call from the interphone device when the detecting means detects,
Means for reducing the ringing level of the notifying means to the slave when the slave detects a call from the interphone device during a call with the telephone line by the detecting means; and And a control device for controlling the horn device.

As described above, if the child device is always carried,
You can get an excellent cordless telephone with an interphone that allows you to hear the ringing sound wherever you are and answer the call immediately.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a cordless telephone with an interphone, a base unit connected to a telephone line and having a radio transceiver, and a radio transceiver corresponding to the base unit. A cordless telephone having a telephone line and a handset capable of transmitting / receiving via the base unit, wherein the handset detects a call from the interphone device during a call with the telephone line. Detecting means for notifying the handset of an incoming call from the interphone device when the detecting means detects the call; and detecting the incoming call from the interphone device while the handset is communicating with the telephone line by the detecting means. Means for reducing the level of the ringing sound of the notifying means to the slave when a call is detected, and a control device for controlling the interphone device from the slave. There, between the handset and the inter horn device via the base unit, an effect that transmission of the signal is possible.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. Embodiment Mode 1 FIG. 1 shows an embodiment mode of the present invention. The figure shows a circuit diagram of a base unit of a cordless telephone, 1 is a high-frequency amplifier of a receiving unit,
Reference numeral 2 denotes a detector, 3 denotes a low-frequency amplifier, 4 denotes a coupler with an external commercial telephone line, 5 and 6 denote signal selectors each generating an output according to a signal input of a specific frequency, and 7 denotes a detector for a specific signal. ,
Reference numerals 8 and 9 denote first and second low-frequency calling oscillators, respectively.
Reference numerals 0 and 11 are a low-frequency amplifier and an amplitude limiter. Reference numeral 12 denotes a power amplifier of a transmission unit, 13 denotes a modulator, 14 denotes a low-frequency amplifier, and 15 denotes a slave unit of the interphone device. 16
Indicates a detector for a call signal from an external telephone line.

[0009] Therefore, the slave unit 1 attached to the entrance or the like now
When the push button 41 of the step 5 is closed, the power supply 44
8 and 57, which are applied to the base of the transistor 39 and the collector and the emitter are short-circuited.
4, a current flows through the resistor 19, and the base is negatively biased with respect to the emitter by this voltage drop.
The collector current flows and is applied to the power amplifier 12 and the modulator 13 through the diode 22. At the same time as the radio wave is emitted, the current passing through 21 flows into the base of the transistor 23, and the collector side is short-circuited. To make
The first calling transmitter 8 is activated and its output is a resistor 47,
45 and is applied to the modulator 13.

Similarly, because current flows through transistor 32 through resistor 55, second ringing oscillator 9 also oscillates and its output is similarly applied to modulator 13. In this way, the standby slave unit (not shown) can hear the mixed sound of the two frequencies. The reason why the outputs of the two oscillators are mixed and transmitted in this manner is to enable the handset to distinguish between a single-frequency ringing tone from a normal telephone line. Further, in the drawing, the power source is shown as a battery 44, but a power source obtained by rectifying an alternating current can be used as generally used. Further, the calling transmitter 9 does not necessarily have to be a sine wave transmitter for its purpose.
Even short-wave or even outgoing transmissions serve their purpose.

[0011] In the slave unit (not shown), when the user hears the ringing tone from the interphone and closes the interphone switch provided in the slave unit, a specific signal is transmitted for a very short time to select the signal of the master unit. This produces a positive output at unit 5 which is applied to the base of transistor 30. Further, since the radio wave from the slave unit is received, a positive output is generated in a squelch circuit (not shown) in the detector 2, and the positive output is added to the base of the transistor 31.
The collector circuit 31 connected in series is short-circuited, so that the transistor 29 is conductive.

Since the voltage on the output side of 29 is applied to the base of 30 through the resistor 64, even after the specific signal is extinguished, 29 continues to conduct, and the current passes through the diode 38. The squelch output is supplied to the transmission unit, the received radio wave disappears, and the squelch output becomes zero.
When the base voltage of the collector circuit becomes zero and the collector circuit is released, the current flowing through 29 is cut off, the state is restored to the initial state, and the current supply to the transmission unit is stopped. Now, when the transmission unit is in operation, if a call is transmitted from the slave unit, it is detected and amplified by the master unit, and the audio output appears at the output terminal 3 and is passed through the condenser 42 and applied to the loudspeaker 43.

On the other hand, since the voltage from one side 29 is applied to the base of the transistor 33 through the resistor 54, the collector side thereof is short-circuited. Therefore the speaker 43
The audio voltage applied to the speaker is grounded by the capacitor 40, so that an audio current flows through the speaker, and the transmission from the slave unit can be heard. Conversely, when a call is transmitted toward the speaker 43, the transmission voltage is applied to the amplifier 10 and the amplitude limiter 1.
Since the signal passes through 1 and is added to the modulator 13, when the transmission is stopped in the slave unit, the transmission from the interphone can be heard. As is clear from the above description, since the same speaker is used for both transmission and reception, it is necessary to use a so-called press-talk method for communication. Also, as is clear from the above description, if the transmitting unit is stopped on the slave unit side at the time of reception, as in the case of normal wireless communication on the slave unit side, the squelch is performed on the master unit side. If the signal disappears and the supply of power to the transmission unit is stopped, and the specific signal is not sent again, the transmission unit will not operate, resulting in inconvenience. In order to avoid such inconvenience, it is necessary to stop only the operation of the low-frequency amplifier of the transmitting unit instead of the transmitting unit at the time of reception. Also, at the time of reception at the master unit, the received audio voltage is output from the speaker 43 as is clear from the circuit diagram.
At the same time, the voltage is also applied to the transmitting amplifier 10, and since this voltage is much higher than the voltage generated by the speaker 43 during transmitting, the amplifier 10 easily becomes saturated. , The transmission unit is in an overmodulation state.
The amplitude limiter 11 is provided to prevent this. Therefore, the audio signal to be transmitted will be quite distorted, but even if this radio wave arrives at the slave unit, the slave unit is in a transmitting state at that time, and the receiving unit is not operating. Does not occur.

Next, the operation of a normal cordless telephone will be described. When the telephone is in the on-hook state and a calling signal appears on the telephone line terminal 59, the discharge tube 17 in the photoelectric signal detector 16 shown in the drawing repeatedly discharges and stops according to the signal, and in accordance with the signal, the resistance is reduced. The resistance of the vessel 18 changes.
When the resistance drops below a certain value, a collector current flows through the transistor 21. This current is supplied to the transmitting section through the diode 22 and also supplied to the base of the transistor 23 through the resistor 53, and the collector side thereof is short-circuited, causing the ringing oscillator 8 to oscillate.
This is transmitted to the child device, and the child device is called. In the slave unit (not shown), when a call switch is pressed, a specific signal modulated with a specific carrier frequency is transmitted, and the specific signal is detected by the specific signal detector 7 of the master unit. Produces a positive output which is connected to transistor 2
5 and the collector side is short-circuited.

On the other hand, since the positive squelch voltage from the detector 2 is applied to the base of the transistor 26, the base voltage of the transistor 24 drops, the transistor 24 conducts, and a voltage appears on the collector side. Since the squelch output is being applied to 26, even after the output from 7 is stopped, 24 will continue to conduct since it is applied to the base of 25. This voltage is applied to the transmitters 12 and 13 through the diode 68. On the other hand, the voltage passing through the transmitter 24 is applied to the transistor 27, and the current activates the relay 28, closes the contact 60, stops the calling signal from the telephone line, and connects with the slave unit. You can talk to the external telephone line. Also, when the user wants to dial the telephone from the child device and call the other party, similarly to the above, when a telephone call switch (not shown) provided on the child device is pressed, a specific signal is generated only for a moment. The transmission is performed externally, the relay of the base unit operates, the telephone is turned off and the hook is set, and the transmission unit is activated at the same time.

In this state, if the slave unit performs dialing according to the telephone number, an intermittent signal of a specific frequency is transmitted in accordance with the dialed number, and the master unit transmits the specific signal in accordance with the necessity. The output of the selector 6 is turned on and off, so that the relay 28 and its contact 60 are turned on and off, and a dial signal is transmitted.

The operation of the interphone and the cordless telephone has been described above. However, in practical use, there are the following disadvantages. That is, while the slave unit is talking with the other party, the voice of the slave unit may leak to the speaker 43 of the interphone and may be intercepted.
Further, if the intercom call switch 41 is pressed during a call, a loud ringing sound is suddenly mixed in, which may be bothersome and may hurt your ears. Conversely, the same applies when a call is received from an external telephone line while the interphone and the slave unit are talking. An embodiment of the present invention which eliminates the above-described obstacle will be described below. First, a case where the call switch 41 of the interphone 15 is closed during a call between the slave unit and the external telephone will be described. In this case, since the voltage is applied from the power supply through the diode 37, the short circuit 34 of the transistor 35 is released, and the capacitor 40 is released.
The secondary side of the speaker 4 is open, no current flows and the speaker 4
3 does not work.

Further, since the transistors 39, 21, 23 and 32 operate for the switch 41, the ringing oscillators 8 and 9 are activated, but the output thereof is supplied to the connection point between the resistors 47 and 45 by the resistor 46 and the capacitor 69. Since the voltage is divided by the series circuit of the transistor 35 and one tenth is supplied to the modulator, the ringing sound from the interphone does not disturb, and it is known that there is a ringing from the interphone. Things can be done and become useful. The same applies to a case where a call is made from an external telephone circuit during a call between the interphone and the slave unit. As described above, the output of the call oscillator 8 is appropriately divided and applied to the modulator.

During use of the interphone, a voltage is applied to 35 through the diode 36, so that 34 is open and the speaker 43 does not operate. The transistor 33 is provided to eliminate this obstacle. By applying a voltage from the power supply for the interphone to the base of the transistor 33 through the resistor 54, the capacitor 40 is grounded and the speaker 43 is operated. Things.

(Embodiment 2) In the above description and the embodiment, all the power supplies are activated by a specific signal, and after the power supply is activated, the self-holding operation is continued. As an example, a signal using a squelch voltage is used as a signal for canceling the power supply. However, FIG. This is a newly added specific signal detector for cancellation, and other components are the same as those in FIG. 1 and are omitted. That is, if there is no signal 67,
It is assumed that its output is a positive output and its output goes to zero for a short time after the signal is received. Therefore, the transistor 29 is turned on by the start signal, and the voltage of the power supply 44 appears at both ends of the capacitor 66 at the output terminal. However, when the stop signal comes, the transistor 31 is opened, and the resistor 62 and the transistors 30 and 31 are connected. No current passes, 29 is also released, and the power supply is stopped.

(Embodiment 3) FIG. 3 shows another embodiment of the present invention in which an interphone can be called from a slave unit. When the interphone is installed at the entrance, you only need to call the child device from the interphone side, but if you can use it in the elderly, sick, child, baby room etc. Need to be done. In the figure, parts common to FIG. 1 are omitted. In the figure, reference numeral 70 denotes a signal detector for calling an interphone. When a calling signal comes from the slave unit, a positive output is generated at 70, the transistor 71 is short-circuited, an output is generated at 72, and this voltage is applied to the base of 33 through the resistor 81, and the collector side is short-circuited. And the speaker 43 is in the operating state. On the other hand, the output voltage passes through diode 73 and is applied to the base of 23, so that ringing oscillator 8 is activated and its output is
7. The speaker 43 sounds through the resistor 80.

In the above operation, as is apparent from the description of FIG. 1, since the start signal of the transmitting unit and the start signal of the interphone device are not transmitted, the signal for calling the interphone is There is no danger of being sent to another slave. The calling signal from the external telephone line and the calling signal between the slaves are heard by the speaker 43 because the calling oscillator 8 is operating. The diode 77 and the resistor 79 are provided to eliminate such a failure. That is, in any case, paying attention to the fact that the transmitting unit 12 is operating, by applying a transmission voltage to the diode 77 in the reverse direction, the open state of the diode 77 was set to remove the above-described obstacle. Things.

(Embodiment 4) FIG. 4 shows another embodiment of the present invention in which two interphone devices are connected to the master unit so that the slave unit can be switched and used. If two interphones can be used in this way, one of them can be used at the entrance and the other one can be used in the rooms of the elderly, sick, children, infants, etc. It is very convenient It becomes something. In the figure, the same parts as those in FIG. 1 are omitted. Reference numerals 88 and 88 'denote control circuits on the ground side of the speakers 43 and 43', respectively, which can be switched and used by the outputs of the detectors 87 and 87 'of specific signals from the slave units. It is.

That is, when a specific signal is sent from the slave unit and a positive output is generated in the specific signal detector 87, the transistor 83 is turned on, an output is generated at 84, and a part of the output is fed back. When the self-holding operation is started, the radio wave from the slave unit stops, the output of the squelch stops, and when the positive voltage from the SQ disappears, 82 is released, but until that time, the current is continuously supplied. . Since the output voltage of 84 passes through the resistor 86 and is applied to the base of the switching transistor 85, the control circuit 88 is activated and its operation is as described with reference to FIG. Omitted. Thus, the interphone 15 is activated.
Similarly, when a signal for operating the specific signal detector 87 'is sent from the slave unit, the interphone 15'
Is in the operating state. Thus, the interphones 15 and 15 'can be freely switched and used from the slave unit.

(Embodiment 5) FIG. 5 shows an embodiment of the present invention using a four-wire intercom device. In the figure, the same parts as in the previous figure
The same reference numerals are used, and the detailed circuit diagrams of the power supply circuits 91 to 96 are shown in the previous figure. It is. Also, since this figure shows the entire circuit diagram of the base unit of the cordless telephone which is put into practical use, parts that are not directly related to the present invention, such as a device for communication between slave units, are also included. In addition, since it is a block diagram, power supply circuits and the like that are not directly necessary for the description are omitted. Also, the child machine corresponding to the parent machine,
Since it can be easily realized by a known technique, labor is saved.

FIG. 5 will be described step by step.
First, when the visitor closes the switch 41 of the interphone installed at the entrance, the power supply 44 is applied to the base of the transistors 39 and 32 through the resistor 48 and the speaker. When the collector side of 89 is short-circuited, the power supply circuit 96 operates, the transmitting units 12 and 13 and the calling oscillators 8 and 9 operate, and radio waves modulated by the calling signals (f5 and f6) are generated. The slave that has been fired and is in a standby state is called.

In the slave unit (not shown), it is known that the calling is from the interphone by the ringing sound of the mixture of the two frequencies (f5, f6), and the (interphone switch) provided in the slave unit is changed. When this button is pressed, the slave unit is in a call state, and transmits the first extremely short length (f2) signal. This specific signal is detected by the specific signal detector 5 of the master unit, and the output thereof drives a power supply 92 having a self-holding function. The transmitting unit and the amplifiers 104 and 105 operate with the output power.

Therefore, when a call is transmitted from the slave unit, the sound passes through the low frequency amplifiers 3 and 104 and is heard by the speaker 43.
When the voice is transmitted to the microphone 106, the voice becomes 10
It is sent to the slave through 5, 13, and 12, and thus the interphone and the slave can communicate with each other via the master. Conversely, when the intercom is pressed from the slave unit by pressing the call button, a calling signal (f1) is sent out, the signal selection of the base unit is started, the detector 94 is activated, and the output is a power supply that does not perform the self-holding operation. The container 91 is started.

Accordingly, the output of the transmitter 8 passes through the 104 to make the speaker 43 sound. If the intercom button 41 is pressed during a call between the slave unit and the external telephone line, a large ringing sound is suddenly heard, which is inconvenient.
The branch point of 7 and 45 is grounded through 46 to reduce its output to one tenth. Similarly, when there is a call from an external telephone line during a call between the interphone and the handset, the operating voltage of the interphone is applied to the base of 35 through the diode 36 to lower the ringing level. It is.

The signal selector 90 is a circuit used for calling between handset units. The output of the signal selector 90 causes the calling oscillator 8 and the transmitting unit to operate. Reference numeral 7 denotes a detector for a coded signal. Only when this signal is received, the power supply 95 operates, so that the dialing can be performed by opening and closing the relay 28. If only the signal (f4) is sent from the slave unit without sending the code signal, only 94 operates, so that a call can be made via the master unit by the press-talk method between the slave units regardless of the external telephone line ( JP-A-63-
No. 23627). When a call signal is received from an external telephone line, 96 operates, so that the transmission unit and the call oscillator 8 operate to call the slave unit.

In the above description, when the interphone is called from the slave unit, 91 operates, but at that time, 104 operates, so that the signal from the detector 3 is also amplified together with the calling signal from 8, so that May cause inconvenience. For this purpose, the diode 108 is used to apply the voltage from the node 91 in the reverse direction so that the diode 108 is opened. In addition, squelch (S
Q) Although the output from the circuit is added, it is intended to restore the power supply circuit that is performing the self-holding operation when the call ends and the radio wave disappears and the squelch output disappears.

[0032]

As described above, the present invention has a master unit connected to a telephone line and having a wireless transceiver, and a wireless transceiver corresponding to the master unit, and is connected via the master unit. Thus, in a cordless telephone having the telephone line and a handset capable of transmitting and receiving, the interphone device can be connected to the base unit and used, and means for controlling the interphone device can be provided to the base unit. By controlling the control device from the slave unit, the slave unit and the interphone can communicate with each other via the master unit, and a call sound from the interphone can be heard by the slave unit. By doing so, it is possible to eliminate the hassle of having to go to the location of the main unit of the interphone and make a call every time there is a call as in the past, If you leave it as it is, Since it was far away, it was possible to eliminate the drawbacks such as not being able to hear the ringing tone, and also to activate and monitor the interphone freely from the child machine, so that the patient, child, If it is installed in a room for babies, etc., no matter where the housewife is doing housework, it is very convenient to be able to see the state of the room when desired, and if it is installed in a children's room etc. Can be interphone call from the slave unit, call at any time, call can be made, and by connecting a plurality of interphone devices and switching from the slave unit at any time, use for entrance,
It is very convenient because it can be used in parallel with the sick and children. As described above, the present invention has an extremely large practical value.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a cordless telephone device with an interphone according to Embodiment 1 of the present invention.

FIG. 2 is a circuit diagram of a cordless telephone device with an interphone according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram of a cordless telephone device with an interphone according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a cordless telephone device with an interphone according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram of a cordless telephone device with an interphone according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency amplifier 2 Detector 3 Low frequency amplifier 4 Combiner 5, 6 Signal selector 7 Detector 8 First low frequency oscillator for calling 9 Second low frequency oscillator for calling 10 Low frequency amplifier 11 Amplitude limiter 12 Power Amplifier 13 Modulator 14 Low frequency amplifier 15 Slave part of interphone device 16 Detector of ringing signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 1/00 H04M 1/72 H04Q 7/38

Claims (2)

(57) [Claims] 1. A base unit connected to a telephone line and having a wireless transceiver, and a wireless transceiver corresponding to the base unit, so that transmission and reception with the telephone line can be performed via the base unit. in a cordless telephone having a handset, a first detecting means for said child machine detects a call from the inter horn device during a call with the telephone line, the first detecting means when the detected the inter horn device First notifying means for notifying an incoming call from the slave unit to the slave unit; and
Second detecting means for detecting a call from the line, and receiving a call from the telephone line when the second detecting means detects the call.
Second notifying means for notifying the slave unit of a call to the slave unit when the slave unit detects a call from the interphone device while the slave unit is communicating with the telephone line by the first detection means . The level of the ringing tone of the notification means is reduced , and the slave unit is
During a call with the intercom device,
The second notification means for the slave unit upon detecting a call
Means for reducing the ringing level of the
A cordless telephone with an interphone, comprising: a control device for controlling the interphone device. 2. A plurality of interhorn devices are connected to a master unit, and the master unit is provided with switching means for switching to any one of the interhorn devices according to a signal from the slave unit, and the slave unit and the plurality of the plurality of interphone devices are provided. 2. The cordless telephone device with an interphone according to claim 1, wherein a telephone call with the interphone device is realized.