JPS62295520A - Cordless interphone set - Google Patents

Abstract

PURPOSE:To continue the talking even if the transmission of a signal from a master set is unstable by providing a carrier detection circuit, a timer applying time count for a prescribed time and a power supply control circuit stopping the power supply to all circuits after the limit time of the timer elapses to a slave set so as to eliminate the need for the talking maintenance operation of the slave set. CONSTITUTION:In operating a call button 11 of the slave set, power is supplied to all circuits from a power control circuit. While a carrier is detected by the carrier detection circuit 29, the power control circuit continues power to all circuits. Thus, the talking state is held without keeping the call button of the slave set. Incompleting the sending from the master set, since no output exists in the carrier detection circuit 29 in the slave set, the timer 30 applies time count for a prescribed time. Thus, when the depression of the talking switch of the master set is released, the talking enable state of the slave set is released automatically and the switch operation for the end of talking is not required by the slave set and waste of power consumption due to the talking end left unoperated by the slave set is avoided.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Technical Field 1] The present invention relates to a cordless intercom consisting of a master unit and a slave unit, each of which is equipped with a transmitting and receiving circuit for transmitting and receiving wirelessly. .

[Background Art] Conventionally, in this type of cordless intercom, both the parent unit and the slave unit are equipped with a call switch, and when a call is to be made between the master unit and the slave unit, the master unit and the slave unit are both equipped with a call switch. Some devices require you to keep pressing the button to make a call, or some devices hold the pressed state when you press the call switch, and when the call ends, you press the switch again to cancel the call state. However, in the former case, during a call, both the parent unit and the slave unit keep pressing the call switch to maintain the call, which causes inconvenience to the user, and in the latter case, there is a switch ( For example, if you do not operate the end switch or a call switch that also functions as an end switch after the end of a call, the power supply to the device will not be cut off. In devices that are powered by a battery, for example, there is a problem in that the battery runs out of capacity or other inconveniences.

Therefore, in the past, the upstream slave device detected a call from the parent device based on the presence or absence of a carrier, and when the carrier was detected, automatically supplied power to all circuits to establish a talking state. There is. However, with this type of cordless intercom, for example, if the propagation of the transmitted signal is unstable, the carrier may not be detected, and in this case, the call status is immediately changed.
In other words, there was a problem in that the power supply to all the circuits was terminated.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to eliminate the need for the handset side to maintain a call by pressing a call switch during a call; To provide a cordless intercom that does not immediately terminate a call even when the propagation of a transmitted signal from a close contact is unstable, and automatically stops power supply to all circuits on the slave side after the call ends. There is a particular thing.

[Disclosure of the Invention 1 (Embodiment) Figures 1 to 1 are diagrams showing an embodiment of the present invention. This is a cordless intercom consisting of a carrier detection circuit 29 that detects the carrier transmitted from the intimate 1, and a timer 30 that performs a time-limited operation for a predetermined time after the output of the carrier detection circuit 29 disappears.
And carrier detection circuit 2! The remote controller 2 is equipped with a power control circuit that supplies power to all circuits at the J output and stops power supply to all circuits after the time limit set by the timer 30 has elapsed.

The present embodiment will be described in detail below with reference to the drawings.

FIG. 7 is a diagram showing the external appearance of the intimate 1 and the child-isolated 2 of this embodiment. The Intimate 1 is portable and has a vertically elongated handset shape so that it can be easily held by the user, and has a large diameter at the bottom so that it can be placed upright and used for fR operations. An antenna 3 for transmitting and receiving is attached to the top surface of this intimate device 1, a speaker 4 is built in at the top of the front, a microphone 5 is built in at the bottom, and an unlit call table 10 is provided in the center to display the call status. It is a provision. Further, the call switch 6 is provided on the side so that it can be easily operated when the user holds it in his/her hand. On the other hand, the child stand 2 is for indoor use, and has a shape that is placed on a table or the like, and has a high rear end so that the user can easily talk on the phone. This remote control 2 has a transmitting/receiving antenna 3 attached upward from the side, a speaker 4 in the upper part of the front, and a built-in microphone 5 in the lower side. A call indicator light 10ht is provided at the center of the front surface to display the call status, and a call button 11 is provided below this call indicator light 10 to be pressed when calling the caller 1.

Next, the circuit configurations of the intimacy 1 and the child separation 2 of this embodiment will be explained. First, for the sake of explanation, the circuit of the remote control 2 will be explained with reference to FIG. The remote control unit 2 of this embodiment shares a transmitting antenna and a receiving antenna, and is therefore provided with a duplexer 12.

The receiving circuit 13 and the transmitting (i-circuit 14) have the same configuration as a normal transmitting/receiving circuit.
It is composed of a mixer 16, a demodulation circuit 17, and an oscillation circuit 18 as a local oscillation circuit. It consists of 18 parts.

The demodulated output of the receiving circuit 13 is connected to an audio amplifier 21 that amplifies the demodulated output, and an audio amplifier 21 that amplifies the demodulated output. A speaker 4 that outputs audio through the output of the optical amplifier 21 is connected.

The transmitting circuit 14 also includes a microphone 5 into which audio is input, an audio amplifier 22 which amplifies the output of the microphone 5 and inputs it to the transmitting circuit 14, and a call button 11 that is pressed when calling the intimacy 1. A calling signal generation circuit 23 that inputs a calling signal to the transmitting circuit 14 is connected. Further, the output of the receiving circuit 13 includes a ringing signal detection circuit 24 that detects the above-mentioned ringing signal, a ringing tone generation circuit 25 that generates a ringing tone by the output of this ringing signal detection circuit 24, and a ringing signal detection circuit 24, etc. A buffer T26 for inserting the circuit into the audio line, and an operation sound that generates an operation sound so that when the call button 11 is operated, it can be confirmed that the ring tone is also sounding on the remote control unit 2 side. A generating circuit 27 is provided.

In addition, there is also an intermittent reception pulse circuit 28 that generates an intermittent reception pulse for intermittently supplying power to the reception circuit 13 so that it can receive transmission No. 16 from the main unit 1 in a standby state, and is omitted in the drawing. However, a power supply circuit is provided which actually controls the supply of power to the reception circuit 13 using the output of the pulse generation circuit 28 for intermittent reception.

Although the above configuration is also included in a normal cordless intercom, the features of this embodiment will be described below. In other words, in this embodiment, a carrier detection circuit 29 detects whether the transmission signal from the main device 1 is received by the reception circuit 131 by the presence or absence of a carrier, and a predetermined period of time after the output of this carrier detection circuit 29 disappears. The circuit includes a timer 30 that performs a time-limiting operation, and a power supply control circuit that supplies power to all circuits using the output of the carrier detection circuit 29 and stops supplying power to all circuits after the time limit of the timer 30 has elapsed. Note that this power supply control circuit includes the power supply circuit that controls the supply of power to the receiving circuit 13 side, and the transmitting circuit 1.
Furthermore, when any of the carrier detection circuit 29 output, timer 30 output, and OR circuit 39 output, which will be described in detail later, is occurring, the above-mentioned It includes OR circuits 36 to 38 that control both of the power supply circuits and supply power to all circuits regardless of the output of the pulse generation circuit 28 for intermittent reception. moreover,
A timer 31 that produces an output for a predetermined period of time after the call button 11 is operated, and a timer 31 that performs the logical sum of the output of this timer 31 and the output of the call button 11 from the time the call button 11 is operated.
and an OR circuit 39 for supplying power to all circuits until the time limit expires. Note that this timer 3
The time limit operation of 1 is reset by the timer 30 output. In addition, in order to prevent a calling signal or operation sound from being emitted during a call, an inverter 33 for inverting the carrier detection circuit 29 output, and an inverter 33 output and an OR circuit 39 output or a call button 11 output are provided. AND circuits 34 and 35 for performing the AND operation.

Next, the circuit configuration of the master unit 1 will be briefly explained according to diagram #S2. In the case of the master unit 1, the overall circuit configuration is almost the same as that of the slave unit 2, and an operation switch 6 is provided in place of the call button 11. Then, in the case of master unit 1, the call switch 6 is pressed to perform a "C call", so the timer 30
, and is not equipped with OR circuits 36 and 37, and the parent device 1
The timer 31 has a different time limit from the timer 31 of child separation 2.

The operation of this embodiment having the above-described configuration will be described below with reference to FIGS. 3 to 6. First, the case of calling the child remote control 2 from the master device 1 will be explained with reference to FIGS. 3 and 4. When calling the slave 2 using the parent device 1, the child 2 can be called by pressing the call switch 6. In other words, the call switch 6 also serves as a call button.

Assume that the call switch 6 is pressed twice as shown on the right side of FIG. 3(a). At this time, the calling signal generation circuit 2
3 and the transmission circuit 14, the calling signal is sent to the remote control 2 (111
1. When the call switch 6 is operated, the timer 31 detects the falling edge of the call switch 6 (FIG. 3 (L+)), and thereafter, for example, for 2 seconds, the timer 31 outputs. For this reason, the call switch 6
Even when the suppressed state of the communication switch 6 is released after one repetition, power is continuously supplied to all the circuits as shown in FIGS. 3(e) and 3(f). Since the remote control unit 2 that is called by pressing the call switch 6 performs intermittent reception as shown in FIG. It is being held in Therefore, the ringing signal from the master device 1 is received by the slave unit 2, a ringing tone is output from the ringing tone generation circuit 25, and the ringing tone is emitted through the speaker 4. Note that the ringing tone is designed to sound for a predetermined period of time, and while the ringing tone is ringing, the output of the pulse generation circuit 38 for intermittent reception is not generated, so that the ringing signal detection circuit 24 does not detect the ringing signal. Not possible. Also, when this ringtone is ringing in the child separation 2@, the same operation sound as the ringtone is heard in Figure 3 (
As shown in i), there are 6 beeps at 1m of the main unit.

Furthermore, since the carrier detection circuit 29 performs a delay operation so as not to detect a carrier during the dark reception period,
Power is supplied to all the circuits by the output of the carrier detection circuit 29, and the chip 2 is never in a transmitting/receiving state. Then, when the call button 11 of Chimita 2 is operated, as shown in Fig. 4(d).
*As shown in (e), power is supplied to all circuits by the power supply control circuit.

At this time, the carrier detection circuit 29 detects the carrier of the transmission signal from Goodwill 1 for the first time. Then, while the carrier detection circuit 29 is detecting the carrier, the power supply control circuit continues to supply power to all the circuits. Therefore, in the second call, the call state is maintained without continuing to press the call button 11. When the call ends, the friendly 1 side releases the pressed state of the call switch 6 to end the call. At this time, after releasing the press on the call switch 6, Goodwill 1 is in a talk ready state for, for example, 2 seconds, as shown in FIG. maintain the same state. When the transmission of Goodwill 1 is completed, the output of the carrier detection circuit 29 disappears in Goodwill 2 as shown in FIG. 4(f).
As shown in FIG.
Then, the power to the transmitting circuit 14 is disconnected, and the communication enabled state on the side of the contact 2 is released. In this way, when the pressed state of the call switch 6 of Goodwill 1 is released, the callable state of Chitoku 2 is dynamically released, so that there is no need to operate the switch to end the call on the Chitoku 2 side. It also eliminates wasted power consumption due to forgetting to end IM calls. However, the timer 30 releases the pressed state of the friendly 1 call switch 6 and the carrier detection circuit 29 no longer detects the carrier, and the callable state of the friendly 2 side is released after a predetermined period of time. For example, even if the propagation of the transmission signal from the friendly 1 side is unstable, there is no inconvenience such as the communication enabled state of the friendly 2 side being canceled.

Next, the case where Friendly 1 is called from Chi-dense 2 will be explained with reference to FIG. 5 and #S6. As shown in FIG. 6(a), when the call button 11 of Chi-toku 2 is pressed, the operation state of the call button 11 is held for 20 seconds, for example, by the timer 31 of Chi-toku 2, and at the same time Power is supplied to all circuits in the power supply control circuit. When this calling button 11 is operated, a calling signal is transmitted to Goodwill 1 as shown in FIG. At 25, a ringing tone is emitted as shown in FIG. 5(k). At this time, the carrier detection circuit 29 output of goodwill 1 is not generated, as described above.

Incidentally, when the call button 11 is operated, an operation sound for confirming the operation state of the call button 11 is emitted on the close 2 side as shown in FIG. 6(i). In Friendship 1, which is called by the ringing tone, pressing the call switch 6 brings the call ready state, that is, the power supply control circuit supplies power to all circuits and starts the call. When the call ends, the pressed state of the call switch 6 of Friendly 1 is released, and after the expiry of the timer 30, 2 The callable state is canceled.

[Effects of the Invention 1 12- As described above, the present invention includes a carrier detection circuit that detects a carrier transmitted from goodwill, a timer circuit that performs a time-limited operation for a predetermined time after the carrier detection circuit output disappears, and a carrier detection circuit that detects a carrier transmitted from a goodwill. The chip is equipped with a power supply control circuit that supplies power to the transmitter/receiver circuit using the output of the detection circuit and stops the power supply to the transmitter/receiver circuit after the expiration of the above-mentioned timer. When the carrier detection circuit 1 is detecting this, the power supply control circuit supplies power to all the circuits of the carrier, so there is no need to keep pressing the call switch in order to maintain a call. The operation is easier, and if the pressed state of the call switch of Goodwill is released and the transmission signal is no longer transmitted from Goodwill, this can be detected by the carrier detection circuit by the presence or absence of the carrier. By stopping the power supply state to the transmitting/receiving circuit in the power supply control circuit after the time-limited operation of the timer which performs the time-limited operation after the output of the carrier detection circuit disappears, the state in which the close communication is available for communication is automatically canceled. In other words, there is no need to operate a switch to end a call on the slave device side, and therefore there is no need for wasted power consumption due to forgetting to end a call on the slave device side.Furthermore, the timer sets the predetermined time when the pressed state of the call switch on the master device is released. Since the callable state of the slave device is canceled after a certain period of time, for example, even if the propagation of the transmission signal from the parent device is unstable, there is no inconvenience such as the callable state of the slave device being canceled. play.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a slave device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a master device of the same example, FIGS. 3 to 6 are operation explanatory diagrams of the same example, and FIG. It is an external perspective view of a container and a child container. 1 is a master device, 2 is a slave device, 13 is a receiving circuit, 14 is a transmitting circuit, 29 is a carrier detection circuit, 30 is a timer, 36 to 38
is an OR circuit. Agent Patent attorney Ishi 1) Ai Figure 7 3 (k) □ Figure 6 (C) JLJ Figure 7 procedure 1N-correct ν- (voluntary)

Claims (1)

[Claims] (1) In a cordless interphone consisting of a master device and a slave device, each equipped with a transmitting and receiving circuit for transmitting and receiving wirelessly, there is a carrier detection circuit that detects the carrier transmitted from the master device, and a carrier detection circuit that detects the carrier transmitted from the parent device, and a The slave device includes a timer that performs a time-limited operation for a predetermined period of time, and a power supply control circuit that supplies power to all circuits using the carrier detection circuit output and stops power supply to all circuits after the timer's time limit has elapsed. A cordless intercom characterized by: