JP2002261945A - Interphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the volume of a call tone sounding from a master phone to the most suitable volume automatically according to the surroundings of the master phone. SOLUTION: In this interphone device, a door phone 1 calls a master phone 2 and a call tone sounds from a loud speaker 26. Mutual conversation between the phones is possible. The master phone 2 is provided with a CPU 30 for adjusting a volume of the call tone from the loud speaker 26 by controlling an electronic volume 35 after detecting the existence of a person around the master phone 2 by a human-body sensor 36 and detecting the level of a surrounding noise by a noise level detecting circuit 37 when the door phone 1 calls the master phone 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus comprising an entrance unit installed outdoors and a base unit installed indoors, and more particularly to an intercom unit capable of adjusting the ringing volume of the base unit.

[0002]

2. Description of the Related Art Conventionally, an intercom apparatus as shown in FIG. 2 has been proposed as this type of intercom apparatus. This intercom apparatus is composed of an entrance cordless handset 100 and a main phone 2
00 is connected via a transmission line L100 composed of two wires, the entrance slave unit 100 is installed at the entrance of the dwelling unit, and the base unit 200 is installed inside the dwelling unit.

[0003] The entrance cordless handset 100 includes a call button 101, a speaker 102, a speaker amplifier 103, a microphone 104,
Microphone amplifier 105, 2-wire 4-wire conversion circuit 106,
It is composed of a separation circuit 107 and a slave unit power supply circuit 108.

A master unit 200 includes a handset 201 including a receiver 201a and a microphone 201b, a receiver amplifier 202, a microphone amplifier 203, and a two-wire / four-wire conversion circuit 20.
4. Hook switch 205, loudspeaker 206, ringer amplifier 207, ringer volume controller 208, ringer detector 209, ringer amplifier 210, CPU 211, slave unit power supply circuit 212, multiplexing / demultiplexing circuit 213, power supply circuit 214 The ringing volume controller 208 sets the ringing volume to “loud (loud sound)”, “medium (medium sound)”,
"Small (small sound)" can be selected. Note that, in the drawing, the thick connection lines are lines for control signals from the CPU 211.

In the intercom apparatus configured as described above, when a visitor at the entrance of the dwelling unit presses the call button 101 of the entrance cordless handset 100, the multiplexing / demultiplexing circuit 107, the transmission line L100, and the multiplexing / demultiplexing circuit of the master unit 200 are provided. A call signal is transmitted to the call detection circuit 209 via 213.

A call detection circuit 209 of base unit 200 detects that there is a call by a visitor based on a call signal from entrance cordless handset 100, and outputs a call detection signal to that effect to CPU 21.
Output to 1. CPU that detects a call detection signal from call detection circuit 209 and shifts from a standby state to a call state.
211 is a ring tone amplifier 207, a ring confirmation tone amplifier 21
0, the slave unit power supply circuit 212 is activated, and a ringing tone signal is output to the ringing volume controller 208 and the ringing confirmation tone amplifier 210. The slave unit power supply circuit 212
The DC voltage from the power supply circuit 214 that supplies the operating power to the components (including the circuit) of the main unit 200 is multiplexed / multiplexed.
Separation circuit 213, entrance device 10 via transmission line L100
Supply 0. The slave unit power supply circuit 10 of the entrance slave unit 100
Reference numeral 8 denotes a two-wire / four-wire conversion circuit 106 and a speaker amplifier 10 based on the DC voltage input through the multiplexing / demultiplexing circuit 107.
3. Activate the microphone amplifier 105 to enable talking.

[0007] The ringing tone signal which is adjusted by the ringing tone volume controller 208 of the base unit 200 and amplified by the ringing tone amplifier 207 is input to the loudspeaker 206 and is sounded as a ringing tone in the dwelling unit. Residents within can know that a call has been received from a visitor. In addition, parent machine 2
00 call confirmation tone amplifier 210, multiplexing / demultiplexing circuit 21
3. The ringing tone signal input to the entrance device 100 via the transmission line L100 is transmitted to the multiplexing / demultiplexing circuit 1 of the entrance device 100.
07, which is input to the speaker amplifier 103 via the two-wire / four-wire conversion circuit 106, the ringing tone signal amplified by the speaker amplifier 103 is sounded as a ringing tone by the speaker 102, and a call is made to a visitor at the entrance of the dwelling unit. Let them know what happened. After outputting the ringing tone signal, the CPU 211 of the base unit 200 deactivates the ringing tone amplifier 207 and the ringing confirmation tone amplifier 210, and stops the ringing tone sounded from each of the speakers 206 and 102.

[0008] The resident in the dwelling unit, who has confirmed the visitor at the dwelling unit by the ringing sound of the loudspeaker 206 of the base unit 200, picks up the handset 201 to establish a telephone call with the visitor and answers the call. Then, the hook switch 205 is hooked off, and when this is detected, the receiver amplifier 202, the microphone amplifier 203, and the two-wire / four-wire conversion circuit 204 become active under the control of the CPU 211 which is shifted from the calling state to the talking state. Thereby, the receiver 201a and the microphone 201b of the handset 201 used by the resident, the receiver amplifier 202 and the microphone amplifier 203, the two-wire / four-wire conversion circuit 204, and the multiplexing / demultiplexing circuit 21
3. Transmission line L100, multiplexing / demultiplexing circuit 107 of entrance cordless handset 100, 2-wire 4-wire conversion circuit 106, microphone amplifier 105
And the entrance cordless handset 10 via the speaker amplifier 103
A communication path is formed between the microphone 104 and the speaker 102, and a transmission signal is transmitted and received from a resident and a reception signal from a visitor through this communication path.

[0009]

However, in such a conventional intercom apparatus, since the ring volume controller 208 of the base unit 200 is of a fixed type by manual switching, the volume control is set to "high". Sounds loud even though there is a resident near the base unit 200, so you may be surprised by a sudden call from the entrance cordless handset 100, or if it is set to "small", the sound of the TV, etc. When the room noise was loud, it was difficult to hear.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional difficulty, and an intercom for automatically adjusting a volume of a ringing tone to be ringed from the base unit to an optimum volume in accordance with a surrounding condition of the base unit. It is intended to provide a device.

[0011]

According to a first aspect of the present invention, there is provided an intercom apparatus capable of calling a master unit from an entrance slave unit and sounding a ringing tone from a loudspeaker, thereby enabling a mutual telephone call. The main unit controls the electronic volume by detecting the presence or absence of a person around the main unit with the human body sensor and the level of the ambient noise around the main unit with the noise level detection circuit when calling from the entrance slave unit, and controlling the electronic volume from the loudspeaker. Has a CPU for adjusting the ringing volume of the user.

According to such an intercom apparatus, when the master unit is called from the entrance slave unit, the master unit detects the presence or absence of a person around the master unit by the human body sensor and the ambient noise around the master unit by the noise level detection circuit. The ringing volume from the loudspeaker can be adjusted by detecting the level and controlling the electronic volume, so that the volume of the ringing tone ringing from the base unit can be automatically adjusted to the optimal volume according to the surrounding conditions of the base unit. become able to.

In the intercom apparatus according to the present invention, the CPU is connected to a ring volume controller for setting a ring volume from a loudspeaker. This allows
Whether the volume setting of the ringing tone by the base unit is manual or automatic can be determined by the resident's intention.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an intercom apparatus according to the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, in the intercom apparatus of the present invention, the entrance slave unit 1 and the master unit 2 have a transmission line L1 consisting of two wires.
The main unit 2 is installed in the dwelling unit, and the main unit 2 is installed in the dwelling unit.

The entrance slave unit 1 comprises a call button 11, a speaker 12, a speaker amplifier 13, a microphone 14, a microphone amplifier 15, a two-wire / four-wire conversion circuit 16, a multiplexing / demultiplexing circuit 17, and a slave unit power supply circuit 18. I have. Specifically, the multiplex / demultiplex circuit 17 connected to the transmission line L1 has a call button 1
1, a slave unit power supply circuit 18 and a 2-wire 4-wire conversion circuit 16 are connected, and the speaker 12 and the microphone 14 are connected via a speaker amplifier 13 and a microphone amplifier 15, respectively.
The drive control terminals of the speaker amplifier 13 and the microphone amplifier 15 are connected to the slave unit power supply circuit 18, respectively.

The base unit 2 includes a receiver 21a and a microphone 2
1b, a handset 21, a receiver amplifier 22, a microphone amplifier 23, a two-wire / four-wire conversion circuit 24, a hook switch 25, a loudspeaker 26, a ring tone amplifier 27, a ring detection circuit 28, a ring tone amplifier 29, a CPU 30, It comprises a power supply circuit 31, a multiplexing / demultiplexing circuit 32, and a power supply circuit 33. The calling volume from the loudspeaker 26 can be set to "loud (loud sound)", "medium (medium sound)"
A ring volume controller 34 which is selected and set by "small (small sound)" and "AUTO (automatic volume control)";
7 has an electronic volume 35 for adjusting the volume, a human body sensor 36 for detecting the presence or absence of a person around the parent device, and a noise level detection circuit 37 for detecting the ambient level around the parent device. The power supply circuit 33 supplies a DC voltage obtained by rectifying and smoothing an AC voltage from a commercial power supply to each component (including a circuit) of the master unit as an operating power source, and the CPU 30 controls each component (including the circuit) of the master unit 2. (Including circuits).

Specifically, a multiplexing / demultiplexing circuit 32 connected to the transmission line L1 is connected to a call detection circuit 28, a slave unit power supply circuit 31, and a 2-wire 4-wire conversion circuit 24, and a 2-wire 4-wire conversion circuit. 24 is connected to the receiver 21a and the microphone 21b of the handset 21 via the receiver amplifier 22 and the microphone amplifier 23, and the call detection circuit 28 is connected to the CPU 30. The hook switch 25, the call confirmation sound amplifier 29, the electronic volume 35, the human body sensor 36, the noise level detection circuit 37, and the call volume controller 34 are connected to the CPU 30. In addition, each drive control terminal of the CPU 30 includes a two-wire / four-wire conversion circuit 24, a receiver amplifier 22, a microphone amplifier 23, and a slave unit power supply circuit 3.
1. Each drive control terminal of the call confirmation sound amplifier 29, the call sound amplifier 27, and the electronic volume 35 is connected.
Further, the call confirmation tone amplifier 29 includes a multiplexing / demultiplexing circuit 32.
In addition, the electronic volume 35 is connected to the loudspeaker 26 via the ring tone amplifier 27, respectively.

In the intercom apparatus constructed as described above, when a visitor at the entrance of the dwelling unit presses the call button 11 of the entrance slave unit 1, the multiplexing / demultiplexing circuit 17, the transmission line L
1. A call signal is transmitted to the call detection circuit 28 via the multiplexing / demultiplexing circuit 32 of the base unit 2.

The call detection circuit 28 of the base unit 2
It detects that there is a call by a visitor based on a call signal from the server, and outputs a call detection signal to that effect to the CPU 30. The CPU 30 having detected the call detection signal from the call detection circuit 28 and shifted from the standby state to the call state activates the electronic volume 35, the ringing sound amplifier 27, the ringing confirmation sound amplifier 29, and the slave unit power supply circuit 31 respectively. A ringing tone signal is output to the electronic volume 35 and the ringing tone tone amplifier 29. At this time, if the ringing volume controller 34 is set to “AUTO” for automatic volume control, the CPU 30 of the base unit 2 determines whether there is a person around the base unit detected by the human body sensor 36 and a noise level detection circuit. The electronic volume 3 based on the level of the ambient noise around the base unit detected at 37
5 is controlled to adjust the ringing volume from the loudspeaker 26. That is, when there is a resident around the base unit, the human body sensor 36 detects that the resident is around the base unit, so the CPU 30 controls the electronic volume 35 to change the volume of the call from the loudspeaker 26. The CPU 30 controls the electronic volume 35 to increase the calling volume from the loudspeaker 26 because the human body sensor 36 does not detect the resident when there is no resident around the base unit. Further, even when the resident is around the base unit, if the surrounding noise level around the base unit detected by the noise level detection circuit 37 is high, the CPU 30 controls the electronic volume 35 according to the surrounding noise level to increase the volume. Speaker 26
Increase the ring volume from. In addition, the ringing volume controller 3
In the case where 4 is set to one of “high”, “medium”, and “low”, which is a manual volume control, the CPU 30 controls the electronic volume 35 so that the ringing volume is based on the setting. To make the loudspeaker 26 ring.

The slave unit power supply circuit 31 activated by the CPU 30 multiplexes the DC voltage from the power supply circuit 33 that supplies the operating power to each component (including the circuit) of the base unit 2. The signal is supplied to the entrance terminal 1 via the separation circuit 32 and the transmission line L1. The power supply circuit 1 for the slave unit 1
8 activates the two-wire / four-wire conversion circuit 16, the speaker amplifier 13, and the microphone amplifier 14 based on the DC voltage input via the multiplexing / demultiplexing circuit 17, and makes the telephone conversation possible.

In this manner, the ringing tone signal amplified by the ringing tone amplifier 27 with the ringing volume adjusted by the electronic volume 35 of the base unit 2 is output in the same manner as in the conventional intercom apparatus.
The loudspeaker 26 is input to the loud speaker 26 and sounds as a ringing tone in the dwelling unit, so that the resident in the dwelling unit can know that the visitor has called. The ringing tone signal input to the entrance device 1 via the ringing confirmation sound amplifier 29, the multiplexing / demultiplexing circuit 32, and the transmission line L1 of the parent device 2 is transmitted to the multiplexing / demultiplexing circuit 17, 2-wire The signal is input to the speaker amplifier 13 via the four-wire conversion circuit 16, and the ringing tone signal amplified by the speaker amplifier 13 is sounded as a ringing tone by the speaker 12, and a call is made to a visitor at the entrance to the dwelling unit. To inform. After outputting the ringing tone signal, the CPU 30 of the base unit 2 deactivates the ringing tone amplifier 27 and the ringing confirmation tone amplifier 29, and stops the ringing tone sounded from each of the speakers 26 and 12.

The resident in the dwelling unit, who has confirmed the visitor at the dwelling unit by the ringing sound of the loudspeaker 26 of the base unit 2, picks up the handset 21 in order to establish a call with the visitor, and answers the call. Then, the hook switch 25 is hooked off, which is detected, and the receiver amplifier 2 is controlled by the CPU 30 which is shifted from the calling state to the talking state.
2, the microphone amplifier 23, and the two-wire / four-wire conversion circuit 24 become active. Thereby, the handset 2 used by the resident
1 receiver 21a and microphone 21b, receiver amplifier 22 and microphone amplifier 23, two-wire / four-wire conversion circuit 2
4, the multiplexing / demultiplexing circuit 32, the transmission line L1, the multiplexing / demultiplexing circuit 17, the two-wire / four-wire conversion circuit 16, the microphone amplifier 15, and the speaker amplifier 13 of the front-end handset 1, A communication path with the speaker 12 is formed, and a transmission signal is transmitted and received from a resident and a reception signal from a visitor are transmitted and received through the communication path.

[0024]

As is apparent from the above description, according to the intercom apparatus of the present invention, it is possible to automatically adjust the volume of the ringing tone ringed from the base unit to an optimum volume according to the surrounding conditions of the base unit. become.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a preferred embodiment of an intercom apparatus of the present invention.

FIG. 2 is a circuit block diagram showing a conventional intercom device.

[Explanation of symbols]

 1 ..... the entrance door station 2 ----- master unit 26 ----- loudspeaker 30 ----- CPU 34 ----- ringing volume control 35 ----- electronic volume 36 · · · · Human body sensor 37 · · · · · Noise level detection circuit

Claims (2)

[Claims] 1. An intercom apparatus capable of calling a master unit (2) from an entrance slave unit (1) and sounding a ringing tone from a loudspeaker (26) so as to be able to communicate with each other. The electronic volume (35) is controlled by detecting the presence or absence of a person around the base unit by a human body sensor (36) and the level of ambient noise around the base unit by a noise level detection circuit (37) when calling from the slave unit. CPU for adjusting the ring volume from the loudspeaker
An intercom apparatus having (30). 2. An intercom apparatus according to claim 1, wherein a ringing volume controller (34) for setting a ringing volume from said loudspeaker is connected to said CPU.