JPS635627A - Cordless interphone - Google Patents

Abstract

PURPOSE:To attain 2-way call and simultaneous talking by providing a talk switch in common use for calling/talking to each of interphone sets so as to transmit/receive a radio wave signal of different frequency. CONSTITUTION:A cordless interphone set 1 is formed as a portable handset type and a talk switch 11 is operated at the talking. Further, the set can be placed on a desk or the like and a talk switch 21 is subjected to one-shot operation, and the talking of the opposite side is outputted from a speaker after the call to apply simultaneous talking. For example, in combining the handset type 1 and the loudspeaker type 2 are combined, then the cordless interphone sets 1, 2 use antennas 15, 25 to transmit/receive the radio wave signals of different frequencies f1, f2 to attain two-way simultaneous talking and the talk switches 11, 21 in common use for the calling/talking are provided to any type.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a cordless intercom capable of bidirectional calling.

[Background technology]

In recent years, cordless intercoms that use weak radio waves have come to be widely used in general households, but recently, instead of the conventional one-way intercoms that can make two-way calls, models that can make two-way calls have been developed. There is. By the way, such conventional cordless intercoms that can make two-way calls are provided with two operation switches for calling and calling, and these two operation switches can be operated to make calls and calls. Because it has an eggplant structure, it is complicated to operate, and there are design limitations from a product standpoint as well as other disadvantages.

[Purpose of the invention]

The present invention was developed in order to solve the above-mentioned problems, and an object of the present invention is to provide a simultaneous calling type cordless intercom capable of two-way calling, which allows both calling and calling operations to be performed with a single operation switch. It is said that

[Structure of the invention]

The present invention proposed to achieve the above object is a cordless intercom that enables two-way calling and simultaneous talking by transmitting and receiving radio signals of different frequencies. It is characterized by having a talk switch that also serves as a function.

In addition, various variations of the cordless intercom proposed here are disclosed, and the first one is configured as a portable handheld type, with a configuration in which the talk switch is operated and held during a call. It has become.

The second one can be installed on a desk, etc., and by one-shot operation of the talk switch, after a call is made, the other party's call can be amplified through the speaker, allowing simultaneous conversation. There is.

Further, among these cordless intercoms, one equipped with a ta control section that prevents power to the transmitting and receiving circuit from being cut off when the talk switch is released or when the carrier signal is interrupted has been disclosed.

EXAMPLES Below, the cordless intercom of the present invention will be explained with reference to the accompanying drawings.

Figures 1 and 2 show handset types 1 and 1, respectively.
An example of a combination of these types, and an example of a combination of handset type 1 and amplification type 2 are shown.

These cordless intercoms 1 and 2 transmit and receive radio wave signals of different frequencies fl and 12 using antennas 15 and 25, allowing simultaneous two-way calls, and both types can be used for both calling and talking. It is equipped with talk switches 11 and 21 that also serve as functions. In addition, 12.22 is a call indicator light that lights up during a call, 13.23 is a microphone, and 14.
Reference numeral 24 indicates a speaker, and the loudspeaker type 2 is such that simultaneous calls can be made while it is placed on a desk or the like.

Figure 3 is the basic hardware configuration diagram of the hand cent type.
Figures 6 to 8 are time charts explaining the operation when two handset types make simultaneous calls, and Φ to ■ shown in each time chart correspond to corresponding parts in each diagram. .

The cordless interphone of the present invention includes a receiving circuit section (1) that combines a speaker SP, an amplifier AMP, a demodulation circuit, a mixer, and an RF/AMP, a microphone MIC, and an amplifier AMP.
Transmission circuit unit combining , modulation circuit, and RF-AMP■
and a power supply control section. Oscillation circuit 10
0, a high frequency signal of a predetermined frequency serving as a carrier signal is output, modulated by the audio signal input from the MIC, and then transmitted as a radio signal from the antenna 15 via a duplexer. Further, the radio wave signal transmitted from the cordless intercom 1 of the other party is captured by the antenna 15, inputted to the receiving circuit section I, demodulated, and then sent to the speaker SP.
It is output as an audio signal.

The talk switch 11 is a so-called push button switch, and when its operation is released, a timer T1 is set. Therefore, the timer Tl is configured to be clocked at the falling edge of the input signal.

The OR gate 1 has the output of the talk switch 11 and the output of the timer T1 (provided so that the power to the transmitter/receiver circuit is not cut off immediately after the talk switch is released, and the set time is specified as τl). and OR
The gate 2 inputs the pulse signal intermittently generated from the intermittent pulse generator 105 and the output of the OR gate 3.
Its output serves as an activation signal for the receiving power supply control circuit 107.

In addition, the OR gate 3 has the output of the OR gate 1 and a timer T2 (as described later, this is used to prevent the power to the transmitting and receiving circuit from being cut off immediately if the carrier signal is interrupted due to an unexpected cause during a call. The setting time is τ2
The output of the OR gate 4 is inputted with the output of the carrier detection circuit 101 and the output of the carrier detection circuit 101 is input, and the output thereof serves as an activation signal for the transmission power supply control circuit 108.

Receiving circuit section! , the transmitting circuit section (■) includes the receiving power supply control circuit 107. The transmission power supply control circuit 108 operates and the power supply 10
It is operated by supplying power from 9.

On the other hand, the AND gate 1 inputs the output of the OR gate 1 and the output of the N○T gate that inverts the output of the carrier detection circuit 101, and operates the ring tone generation section 106 by the AND output of the two. There is. Therefore, the calling tone generating section 106 is activated only while no carrier signal is detected and the talk switch 11 is being operated (after the operation is released, for the set time τ1 of the timer T1),
A ringing tone is sent to the transmitting circuit section ■.

Further, the AND gate 2 generates an operation sound generator 10 by logical product of the output of the talk switch 11 and the output of the NOT gate.
4, the talk switch 11 is operated and the operation sound is output from the speaker SP only when no carrier signal is detected.

Further, the receiving circuit section I is provided with a calling tone detection circuit 102, and when the calling tone transmitted from the other party is detected by this circuit 102, the chime sound generating section 1
03 is activated, and a chime sound is output from the speaker SP for a preset time τ3. Furthermore, since a reset signal is sent to this chime sound generating section 103 from the transmission power supply control circuit 108, even within the set time τ3, when the transmission power supply control circuit 108 is activated, the sounding of the chime is immediately stopped. .

In addition, a calling tone generating section 10 provided in the transmitting circuit section (■)
6 is activated when calling the other party, and outputs a calling tone to the transmitting circuit section (2).

In a cordless intercom with this configuration,
Since the receiving power supply control circuit 107 is intermittently operated by the intermittent pulses output from the intermittent pulse generator 105, power is supplied from the power supply 109 to the receiving circuit section (2), and the receiving circuit section I is operated intermittently all the time. Ru. Therefore, in this embodiment, even when the talk switch 11 is not turned on, the carrier signal and the calling signal of the other party can be detected during the intermittent operation of the receiving circuit section (2).

Next, with reference to FIG. 6, an explanation will be given of the operation when two-way simultaneous calls are made between the hand-held type cordless intercoms 1.1.

``fat'' indicates the calling side, and ``mountain'' indicates the operation of the called side.

Note that in these time charts, the rise of the carrier signal has a slope, assuming squelch processing (muting processing) in FM communication.

As shown in the figure, the calling side operates the talk switch 11 to turn on the power to the transmitting/receiving circuit and transmitting.

Activate the receiving circuit section I, ■. At this time, since there is no carrier signal, AND gate 1. The output of AND gate 2 is sent to ring tone generator 106. The operation sound generating section 104 is activated, and the ringing tone is sent to the antenna 15 via the transmitting circuit section I.
At the same time, an operation sound is output from the speaker SP.

When the talk switch 11 is released during such a calling operation, the output of the A N D gate 2 is reversed and the operation sound stops, but the timer T1 is set.
During the set time τ1 of the timer T1, the transmitting and receiving circuits 1. II operation is maintained and the output of the ringing tone is maintained.

In response to such an invocation operation on the calling side, the called side performs the following:
Since the receiving circuit section (■) is intermittently operated by the intermittent pulse generating section 105, the ringing tone detection circuit 1 of the receiving circuit section (■)
02 detects a ringing tone sent by the calling party.

When a calling tone is detected, the chime sound generating section 103 is activated for a set predetermined time (τ3), and a chime sound is output from the speaker SP.

The called party knows that it has been called by the chime sound, and operates the talk switch 11 to turn on the tfA of the transmitting/receiving circuit and operating the transmitting circuit section (2) and the receiving circuit section (2). Furthermore, as a result of this operation, on the called side, the operation sound generation unit 104 is activated and the operation sound is output from the speaker SP, and the calling tone generation unit 106 is activated, in the same way as the above-mentioned operation of the calling side. A ringing tone is output to the calling side as a response signal. In response to this response from the called party, the carrier detection circuit 101 detects a carrier signal, allowing both parties to talk. Also, by detecting the carrier signal, AND gate 1. Both AND gates 2 invert their outputs so that the generation of the ring tone is stopped and at the same time the ringing of the chime is also stopped. Furthermore, the sounding of the chime is also stopped when the power to the transmitting circuit is turned on, and therefore the chime sound generating section 203 is
A recent signal is being sent to.

During a call between both parties, the talk switch 11 is held in operation, and even if the operation is released in the middle, the talk switch 11 will be turned off by the time set by timer T1.
During this time, tB cutoff of the transmitting/receiving circuit is prohibited, so the call will not be cut off midway.In such a handset-type cordless intercom, the talk switch 11 must be operated to continue the call. Since the timer TI is configured to hold the timer TI, the set time r1 of the timer TI may be a short time that takes into consideration changing hands during a call.

In addition, in such a handset type cordless intercom 1, the power to the transmitting/receiving circuit is not cut off while the talk switch 11 is being operated and held during a call, so the timer T2 can be omitted. An example of the hardware configuration in this case is shown in FIG.

With the above operations, if one carrier signal is interrupted while both parties are talking, timer T2 is set and the transmitter/receiver circuit is 1!1' for the set time 2.
a-blocking is prohibited.

In the example shown in FIG. 6, after the calling side releases the operation of the talk switch 11 and timer T1 times up, the carrier signal is cut off and the transmitting/receiving power supply circuit is prohibited from being powered off for the set time τ2 of timer T2. Also, in the cordless intercom of the present invention configured as described above, when a call ends, the carrier signal is also interrupted during the time amplification of timer T1, the operation timing of timer T2 is delayed, and the power to the transmitting/receiving circuit is cut off. Even if
When the other party operates the talk switch 11 or the timer Tl prohibits power cutoff of the transmitter/receiver circuit, it is possible to re-call the side whose transmitter/receiver circuit's power was cut off. It is shown in FIG.

In addition, if the carrier signal is interrupted during a call by operating the talk switch 11, the interrupted side will continue to hear the operation sound until the carrier signal is received from the other party again.
Since a calling tone is output, the state can be known, and a chime can be sounded to inform the other party who has released the operation of the talk switch 11 of the state. The operation in this case is shown in FIG. 8 with a time chart.

FIG. 5 shows an example of the hardware configuration of the cordless intercom 2 of the amplification type.

The basic configuration is the same as that of the hand cent type, and corresponding parts are numbered with 2 at the top, and the explanation will be omitted.

In this type of switch, the talk switch 21 is configured to be able to continue turning on the transmitting/receiving circuit ti for a predetermined period of time by one shot. It is set up.

In this type, unlike the hand sent type, the talk switch 11 is operated in one shot to send data.

Receiving circuit section 1. Since it is necessary to receive a calling tone from the other party and make a call while the power of the It is maintained, the set time τ1' of the timer T1 is set to a relatively long time with sufficient margin.

Also, unlike the hand-sent type, the talk switch is not operated and held to make a call, so if the carrier signal is interrupted after the set time τ1' of timer T1 has expired during a call, the transmitter/receiver circuit's power supply is turned off. Since the configuration is such that the carrier signal is cut off, it is necessary to prohibit power cut-off of the transmitting/receiving circuit for a predetermined time τ2' after the carrier signal is cut off, and for this purpose, the timer T2 is required.

In addition, in such an embodiment, the set time τ of the timer T1
Even though 1' is set to an extremely long time, the call time may end in a short time. In such a case, timer T2 can be used to prohibit power cut-off of the transmitter/receiver circuit for a predetermined time τ2' after the carrier signal is interrupted, and when timer T2 times up, timer TI can be reset, and the power source such as a battery can be reset. This is extremely effective in reducing energy waste. Figure 5 shows a loudspeaker type cordless intercom with the above considerations in mind; Needless to say, the present invention can also be applied to cordless intercoms.

FIGS. 9 and 10 are time charts illustrating the operation of each part when making a call and talking between the loudspeaker type cordless intercom 2 and the handset type 1 cordless intercom.

FIG. 9 shows a case where a handset type 1 calls a loudspeaker type 2 to make a call, and FIG. 10 shows the reverse case.

11 to 17 illustrate the configuration and operation of the power supply control section of the transmitter/receiver 1a source control circuit included in the above-described embodiment.

FIGS. 11 and 12 are time charts illustrating the configuration of a power supply control unit suitably used in a handset type cordless intercom and the operation of each part thereof to prohibit power cut-off of the transmitter/receiver circuit when the talk switch is released. , Fig. 13, and Fig. 14 show the configuration of a power supply control unit suitable for use in both handset and loudspeaker type cordless intercoms and the operation of each part thereof, in order to prohibit power cut-off of the transmitter/receiver circuit when the carrier signal is interrupted. The time chart to be explained, FIG. 15, shows the predetermined time τ1 (τ1') of timer T1, which prohibits the transmission/reception circuit from being cut off when the talk switch is operated or released, and the predetermined time τ2 of timer T2, which operates when the carrier signal is interrupted. Fig. 16 is a block diagram of a power supply control unit that is preferably used when the setting is longer than (τ2'). FIG. 17 is a time chart explaining the operation of each part when applied to a hand-sent type. FIG. A time chart explaining the operation is shown.

The specific operations of each of these source control units have already been explained in the above-mentioned embodiments, so FIGS. 11, 13, and 1
In FIG. 5, reference numerals corresponding to those in the above-mentioned figures are given, and explanations thereof will be omitted.

〔Effect of the invention〕

As can be understood from the above explanation, the cordless intercom of the present invention enables both calling and talking by operating one talk switch, which simplifies the operation and reduces the number of parts. There are no design restrictions and it has extremely high commercial value.

[Brief explanation of the drawing]

1 and 2 are diagrams showing examples of combinations of the cordless intercom of the present invention, FIGS. 3 and 4 are side views of the hardware configuration of the hand-sent type cordless intercom, and FIG.
The figure is a side view of the hardware configuration of a loudspeaker type cordless intercom, and Figure 6 is a time chart explaining the operation of hand-sent type cordless intercoms during a call.
Fig. 7 is an operation time chart when performing a recall operation;
Figure 8 is an operation time chart when the carrier signal is interrupted during a call and an operation sound is output to notify an abnormality. Figure 9
Figures 10 and 10 are time charts illustrating operations during calls made by hand-sent type and loudspeaker type cordless intercoms, and Figures 11 to 17 are configurations of the power control unit built into the cordless intercom. 3 is a time chart illustrating the operation of each part thereof. (Explanation of symbols) 1... Hand sent type cordless intercom 2... Loudspeaker type cordless intercom 11...
Talk switch■...Reception circuit section■...Transmission circuit section

Claims (6)

[Claims] (1) A cordless intercom that transmits and receives radio signals of different frequencies to enable two-way calling and simultaneous talking, and each intercom is equipped with a talk switch for both calling and talking. A cordless intercom featuring (2) The cordless intercom according to claim 1, wherein the intercom is configured as a portable handset type, and the talk switch is operated and held during a call. (3) The intercom can be installed on a desk or the like, and a call can be made after a call is made by one-shot operation of the talk switch. cordless intercom. (4) The above-mentioned intercom has power control that turns on the power to the transmitting/receiving circuit when the talk switch is started to be operated, and prohibits turning off the power to the turned on transmitting/receiving circuit for a predetermined time τ1 when the talk switch is released. 2. A cordless intercom according to claim 1, which comprises a cordless intercom. (5) When the carrier signal transmitted from the other party of the call is interrupted, the above-mentioned intercom operates for a predetermined period of time τ2.
The cordless intercom according to claim 1 or 2, or 3 or 4, further comprising a power supply control unit that prohibits power cutoff of the transmitting/receiving circuit. (6) In the above-mentioned intercom, the time τ1 for prohibiting power cutoff of the transmitting/receiving circuit when the talk switch is started or released is set longer than the time τ2 for prohibiting power shutoff of the transmitting/receiving circuit when the carrier signal is interrupted. , Claims 1 or 2 or 3 or 3 further comprising a power supply control unit that immediately shuts off the power to the transmitting/receiving circuit when the prohibition time τ2 expires after the carrier signal is interrupted. The cordless intercom according to item 4 or 5.