JP3342617B2 - Door phone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door intercom device, and more particularly to a door intercom device capable of performing a telephone call according to the level of ambient noise.

[0002]

2. Description of the Related Art Conventionally, a door phone apparatus as shown in FIG. 4 has been proposed. Entrance unit 51 outside the room includes a handset receiver 53 connected to base unit transmitter amplifier 66 of indoor base unit 57, a handset speaker 52 connected in series to handset receiver amplifier 53, and an indoor base unit. A slave unit transmission amplifier 55 connected to the base unit reception amplifier 63
And a slave unit microphone 54 connected in series with the
A call switch 56 connected to a call detection circuit 59 via a resistor R11 connected to the call switch 5 is provided.

The indoor master unit 57 includes a power supply circuit 58 for supplying power to each circuit, a hook switch 74 connected to supply power to the master receiver amplifier 63 and the master transmitter amplifier 66, and A call detection circuit 59 for detecting a call from the entrance cordless handset 51, a ring sound generation circuit 60 connected to the call detection circuit 59 for generating a ring sound, and a ring tone amplifier 61 connected to the ring tone generation circuit 60. A base unit speaker 62 connected to the ringing tone amplifier 61 and ringing a ringing tone;
A handset 68 having a base unit speaker 64 and a base unit microphone 65 for talking with the entrance cordless handset 51, a base unit transmission amplifier 66 connected to the base unit microphone 65, and a base unit connected to the base unit speaker 64 A receiver amplifier 63 is provided.

In this door phone apparatus, when a visitor presses the call switch 56 of the entrance unit 51 outside the room, the call detection circuit 59 of the indoor base unit 57 detects a call from the entrance unit 51. When a call is detected, a ringing tone is generated by a ringing tone generating circuit 60, amplified by a ringing tone amplifier 61, and sounded by a base unit speaker 62. When the ringing tone is sounded, the resident in the room picks up the handset 68 including the base unit speaker 64 and the base unit microphone 65. When the handset 68 is picked up, the hook switch 74 is set to the UP state (closed), power is supplied to the master receiver amplifier 63 and the master transmitter amplifier 66, and the indoor master unit 57 is turned on.
And the call to the entrance slave unit 51 are enabled.

[0005]

In this door phone apparatus, since the entrance slave unit talks to the indoor master unit by loudspeaking, it cannot be heard if the ambient noise of the entrance slave unit is loud. There were drawbacks, such as doing noise.

An object of the present invention is to provide a door phone apparatus capable of performing a telephone conversation in accordance with an ambient noise level by detecting a noise level during standby to solve such a problem. .

[0007]

In order to achieve the above object, an intercom apparatus according to the present invention comprises: a front-end handset having a handset speaker, a handset microphone, and a call switch; It has a handset including a detection circuit, a ringing tone generation circuit that generates a ringing tone by the call detection circuit, a slave unit speaker, a base unit receiver amplifier for talking with the slave unit microphone, a base unit speaker, a base unit microphone, and a transmission amplifier. An indoor master unit is provided, and the indoor master unit detects whether the noise level from the slave unit microphone exceeds a predetermined threshold value during standby and outputs a high-level signal when the noise level exceeds the threshold value. A standby sound level detection circuit, and a high-level signal from the standby noise level detection circuit to adjust the input to the slave speaker higher and the input to the master speaker lower. And a reception voice adjuster for,
The stand-by noise level detection circuit includes a holding circuit for holding the stand-by noise level detected by the stand-by noise level detection circuit by either the call detection of the call detection circuit or the hook-up of the handset. The adjuster is a master unit microphone,
A first resistor inserted between the transmission amplifiers, an analog switch connected in parallel to the first resistor and controlled by a detected noise level held by a holding circuit of the standby noise level detection circuit, and a master unit microphone From the analog switch controlled by the detected noise level held by the holding circuit of the standby noise level detection circuit from (−) to the signal level
On the (+) side, a comparator to which a reference level is input is provided, and the receiving voice adjuster is connected in parallel to the second resistor inserted between the parent receiving amplifier and the parent speaker, and to the second resistor. And an analog switch controlled by a comparator.

[0008] In this door phone apparatus, an appropriate telephone call can be made by detecting the noise level and adjusting the input of the master speaker and the slave speaker according to the level.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a door phone apparatus according to the present invention.

In the door phone apparatus according to the present invention as shown in FIG. 1, an entrance cordless handset 1 outside a room has a handset speaker 2 for outputting sound from an indoor master unit 7 and a slave unit for transmitting sound to the indoor master unit 7. The sub-unit microphone 4, the call switch 6 for calling the indoor parent unit 7 via the resistor R1, the sub-unit receiving amplifier 3 connected to the sub-unit speaker 2, and the sub-unit transmission amplifier 5 connected to the sub-unit microphone 4. Have.

The indoor master unit 7 includes a power supply circuit 8 for supplying power to each of the circuits, a call detection circuit 9 for detecting a call from the entrance terminal 1, and a call for generating a ringing sound by the call detection circuit 9. A tone generating circuit 10, a ring tone amplifier 11 for amplifying a ring tone, and a ring tone speaker 12 for generating a ring tone
A handset 18 including a base unit microphone 15 and a base unit speaker 14 for talking with the base unit speaker 2 and the base unit microphone 4, a base unit receiver amplifier 13, and a base unit transmission amplifier 16
A hook switch 24 for supplying power to the base unit receiver amplifier 13 and the base unit transmission amplifier 16, and whether or not the noise level from the slave unit microphone 4 exceeds a predetermined threshold value during standby. And a standby noise level detection circuit 19 that outputs a high-level signal when the threshold level is exceeded, and a high-level signal from the standby noise level detection circuit 19 determines the input volume level to the slave speaker 2. The transmission voice adjuster 20 which adjusts the volume higher, the reception voice adjuster 21 which lowers the input volume level to the main unit speaker 14, and the call detection of the call detection circuit 9 and the hook-up 22 of the handset 18 stand by. And a holding circuit 19d for holding the noise level detected by the noise level detection circuit 19 during standby.

The input side of the base unit receiver amplifier 13 of the indoor base unit 7, the output side of the base unit transmitter amplifier 16, the call detection circuit 9, and the standby noise level detection circuit 19 are connected to the entrance slave unit 1. I have. The output side of the base unit receiver amplifier 13 is connected to the base unit speaker 14 of the handset 18 via the reception voice adjustment unit 21, and the input side of the base unit transmission amplifier 16 is connected to the handset 18 via the transmission voice adjustment unit 20. Connected to parent device microphone 15. The power supply sides of the base unit receiver amplifier 13 and the base unit transmitter amplifier 16 are connected to a hook switch 24. The call detection circuit 9 is connected to a ring tone generation circuit 10 and a standby noise level detection circuit 19, and the call detection circuit 9 and the standby noise level detection circuit 19 include a hook switch 22 that operates in conjunction with a hook switch 24. It is connected. The standby noise level detection circuit 19 is connected to the transmission voice adjuster 20. The ring tone generating circuit 10 is connected to a ring tone speaker 12 via a ring tone amplifier 11.

The transmission voice adjuster 20 includes resistors r1, r2, r
3, r4, analog switches SW1, SW2, a diode D1, a capacitor C1, and a comparator AMP1. The resistors r1 and r2 are connected in series, one is connected to the base unit microphone 15, the other is connected to the base unit transmission amplifier 16, and the resistor r1 is connected to the (-) side of the comparator AMP1 via the analog switch SW2 and the diode D1. ing. The resistor r2 and the analog switch SW1 are connected in parallel.
The control output side of the standby noise level detection circuit 19 is connected to the control input side of the analog switches SW1 and SW2.
One of the capacitors C1, the other of which is connected to the reference potential point, is connected to the connection point between the diode D1 and the (-) side of the comparator AMP1. The power supply Vcc is supplied to the (+) side of the comparator AMP1 after being divided by the resistors r3 and r4.

The receiving voice adjuster 21 has a resistor r connected to the base unit receiver amplifier 13 on one side and the base unit speaker 14 on the other side.
5 and the analog switch SW3 are connected in parallel, and the control input side of the analog switch SW3 is connected to the output side of the comparator AMP1 of the transmission voice adjuster 20.

The standby noise level detecting circuit 19 as shown in FIG. 2 includes a comparator 19a, an oscillator 19b,
An analog switch 19c and a holding circuit 19d are provided. The entrance device 1 is connected via a diode to the (-) side of the comparator 19a, the U / D terminal of the holding circuit 19d is connected to the output side of the comparator 19a, the CK terminal is adjusted to the oscillator 19b, and the Hi terminal is adjusted for transmission voice. Connected to the vessel 20. On the (+) side of the comparator 19a, one is a power supply Vc.
c, the other end is connected to the connection point of the series resistor connected to the reference potential point. One of the analog switches 19c is connected to the oscillator 19b, and the other is connected to the reference potential point. The control input side of the analog switch 19c is connected to the hook switch 22.

In the intercom apparatus configured as described above, during standby, the noise level from the slave unit microphone 4 of the entrance slave unit 1 is always detected by the standby noise level detection circuit 19, and is set to the noise level. The corresponding detected volume level is output. When a visitor pushes the call switch 6 of the entrance unit 1 outside the room, the call detection circuit 9 of the indoor base unit 7 detects a call from the entrance unit 1. When a call is detected, a ring tone is generated by a ring tone generating circuit 10, amplified by a ring tone amplifier 11, and a ring tone is sounded by a ring tone speaker 12. When the ringing tone is sounded, the resident in the room can hear the master speaker 1.
4 and a handset 18 provided with a base unit microphone 15. When the hook switch 24 is in the UP state (closed), power is supplied to the parent machine receiver amplifier 13 and the parent machine transmitter amplifier 16. When the call detection circuit 9 detects a call from the cordless handset 1, the standby noise level detection circuit 19 holds the detected sound level at the level at which the call was detected.
When the held detected volume level is at the low level, the analog switches SW1 and SW2 of the transmission voice adjuster 20 whose input to the control input side is at the low level are turned off. When the analog switch SW2 is turned off, the signal level input to the (-) side is compared with the (+) side reference level generated by the resistors r3 and r4. If the signal level is smaller than the reference level, the received voice is adjusted. The comparator AMP1 which turns on the analog switch SW3 of the switch 21 and turns off the analog switch SW3 when the signal level is higher than the reference level turns on the analog switch SW3. At this time, the audio signal input to the base unit microphone 15 includes resistors r 1 and r 2, and the base unit transmission amplifier 1
6, is output to the entrance device 1, and the audio signal from the entrance device 1 is transmitted to the base unit reception amplifier 13 and the analog switch SW 3.
Is output from the base unit speaker 14 via the base unit, and the indoor base unit 7 and the entrance unit 1 can communicate with each other at a normal audio level.

The held standby noise level detection circuit 19
When the detected sound volume level output from is high, the analog switches SW1 and SW2 of the transmission voice adjuster 20 whose input to the control input terminal is a high level signal are turned on. The audio signal input to the base unit microphone 15 is the transmission audio adjuster 2
The signal is input to the (−) side of the comparator AMP1 via the analog switch SW2 of 0 and the diode D1. comparator
In the AMP1, the audio signal level input from the base unit microphone 15 is compared with the reference level on the (+) side, and since the audio signal level is higher, the analog switch S of the reception audio adjuster 21 is compared.
Turn off W3. At this time, the audio signal input to the base unit microphone 15 is output to the entrance slave unit 1 via the resistor r1, the analog switch SW1, and the base unit transmission amplifier 16, and the audio signal from the entrance unit 1 is transmitted to the base unit reception amplifier. 13. By being output from the base unit speaker 14 via the resistor r5, the volume level of the audio signal input to the base unit transmission amplifier 16 is increased and output to the entrance unit 1, and The volume level of the audio signal is reduced only when the audio signal is input to the parent device microphone 15 and output from the parent device speaker 14. As a result, the indoor parent device 7 and the entrance child device 1
Can talk.

The operation of each unit of the standby noise level detection circuit 19 will be further described with reference to FIG.

During standby, the hook switch 22 is open, so that a high-level signal is input to the control input side of the analog switch 19c from the call detection circuit 9, the analog switch 19c is turned on, and the oscillator 19b is used as a reference. Connected to the potential point. In this state, the holding circuit 19d
The U / D terminal becomes effective, and the holding circuit 19d outputs the reverse level of the output of the comparator 19a to the Hi terminal. That is, when noise of a volume level larger than the threshold value set at the reference point p input to the (+) side is input to the comparator 19a, the output of the comparator 19a becomes low level and the holding circuit 19
d outputs a High level signal from the Hi terminal to the transmission voice adjuster 20. When noise of a volume level smaller than the threshold value set at the reference point p input to the (+) side enters, the output of the comparator 19a becomes High level, and the holding circuit 19d
Outputs a low level signal from the Hi terminal. However, when the hook switch is in the UP state, or when the call detection circuit 9 detects a call and a low level signal is input to the control input side of the analog switch 19c of the standby noise level detection circuit 19, the analog switch 19c Turns off and oscillator 1
9b is separated from the reference potential point, and the output level output from the Hi terminal at that time is held.

When the handset 18 is raised by the indoor master unit 7 to monitor the periphery of the entrance slave unit 1 during standby, the hook switches 22 and 24 are closed, and the analog switch 19c of the standby noise level detection circuit 19 is closed. , The analog switch 19c is turned off, and power is supplied to the base unit receiver amplifier 13 and the base unit transmission amplifier 16. When the analog switch 19c is turned off, the stand-by noise level detection circuit 19 detects the level of the front-end handset 1 and monitors the normal audio level or the audio level at the time of noise as in the case of detecting the call. .

In the above embodiment, the calling speaker 1 is used.
Although two speakers, that is, the main speaker 2 and the base speaker 14, are provided, the ring speaker 11 is connected to the base speaker 14 of the handset 18 as shown in FIG. You can also.

[0022]

As is clear from the above description, according to the door phone apparatus of the present invention, it is possible to make a telephone call adaptive to the ambient noise level by detecting the noise level during standby.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a door phone device according to the present invention.

FIG. 2 is a block diagram of a standby noise level detection circuit provided in the indoor master unit of the door phone device according to the present invention.

FIG. 3 is a block diagram showing an embodiment in which the intercom apparatus has one master speaker.

FIG. 4 is a block diagram showing a conventional door phone apparatus.

[Explanation of symbols]

 1) Entrance cordless handset 2) Handset speaker 4) Handset microphone 6) Call switch 7) Indoor parent unit 9) Call detection circuit 10) Ring sound generation circuit 14 ‥‥‥ Main unit speaker 13 ‥‥‥ Main unit receiving amplifier 15 ‥‥‥ Main unit microphone 16 ‥‥‥ Transmitting amplifier 18 ‥‥‥ Handset 19 ‥‥‥ Standby noise level detection circuit 19d ‥‥‥ Holding circuit 20 ‥‥‥ Speech sound adjuster r1, r2 ‥‥‥ First resistance SW1 ‥‥‥ Analog switch SW2 ‥‥‥ Analog switch AMP1 ‥‥‥ Comparator 21 ‥‥‥ Receive sound adjuster r5 ‥‥‥ Second Resistance SW3 ‥‥‥ analog switch

Claims (1)

(57) [Claims] 1. A slave speaker (2), a slave microphone (4),
An entrance cordless handset (1) having a call switch (6), a call detection circuit (9) for detecting a call by operating the call switch, a ring sound generation circuit (10) for generating a call sound by the call detection circuit, A room having a handset (18) including the base unit speaker , a base unit receiver amplifier (13) for talking with the base unit microphone, a base unit speaker (14), a base unit microphone (15) , and a transmission amplifier (16). A master unit (7), wherein the indoor master unit detects whether or not the noise level from the slave microphone exceeds a predetermined threshold value during standby, and sets a high level when the noise level exceeds the threshold value. A standby noise level detecting circuit (19) for outputting a level signal; and a transmission voice adjuster (20) for adjusting an input to the slave unit speaker high by a high level signal from the standby noise level detecting circuit. And the parent machine Comprising reception voice regulator for regulating low input to mosquitoes and (21), the standby time noise level detection circuit, the call detection circuit
Any of call detection and hookup of the handset
The standby noise level detection circuit detects the standby state
A holding circuit (19d) for holding a noise level, wherein the transmission voice adjuster includes the base unit microphone and the transmission
A first resistor (r1, r2) inserted between the
The standby noise level detection circuit is connected in parallel to the
Control by the detected noise level held by the holding circuit
Analog switch (SW1) to be connected and the master unit microphone
From the standby circuit in the standby noise level detection circuit.
Analog level controlled by the detected noise level
The signal level goes to the (-) side via the switch (SW2),
A comparator in which the reference level is input to the (+) side
(AMP1), and the receiving voice adjuster includes the base unit receiver amplifier, the base unit
A second resistor (r5) inserted between the speakers;
2 connected in parallel to two resistors and controlled by the comparator
And an analog switch (SW3) to be operated.