JPH11261710A - Interphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interphone device that incorporates a circuit by which the sound volume of a call confirmation tone is reduced by pressing simultaneously a call switch and a call confirmation tone mute switch. SOLUTION: In this interphone device consisting of an entrance slave set 11 having a slave set microphone 12, a microphone amplifier 13, a slave set speaker 14 and a call switch 16 and of an indoor master set 29 having a hand set 33 consisting of a call detection circuit 30, a call tone generating circuit 31, a master set microphone 33-a and a master set receiver 33-b, the entrance slave set 11 is provided with a call confirmation tone mute switch 17 that is connected in parallel with the slave set speaker and mutes a call confirmation tone sent out of the call tone generating circuit and with a call confirmation tone mute capacitor 18 that reduces an impedance of the call confirmation tone by closing the call confirmation tone mute switch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus, and more particularly, to an intercom apparatus capable of changing the level of a call confirmation sound of a front-end device.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of intercom apparatus, as shown in FIG. 2, a sub-unit microphone 52, a microphone amplifier 53, a sub-unit speaker 54, a night display LED
55, Entrance cordless handset 51 having call switch 56
A call detection circuit 30, a ring tone generation circuit 31,
2. Description of the Related Art There is known an intercom apparatus including an indoor parent device 29 having a handset 33 including a parent device microphone 33-a and a parent device receiver 33-b. In the intercom apparatus configured as described above, when a call is made, when the call switch 56 is pressed, the call detection circuit 30 of the indoor master unit 29 detects and notifies the call sound generation circuit 31, and the call confirmation circuit 31 confirms the call. By transmitting a sound and making the base unit receiver 33-b make a ringing sound and simultaneously making the child unit speaker 54 ring, the visitor was notified that the calling was started.

[0003]

In the conventional intercom system, when a call is made at the entrance slave unit as described above, a call confirmation sound of a constant volume is sent from the indoor master unit, so that a visit was made at midnight. In such a case, there is a problem that the call confirmation sound is too loud to cause trouble for the neighborhood.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to reduce the volume of a call confirmation sound by simultaneously pressing a call switch and a call confirmation sound mute switch. I do.

[0005]

To achieve the above object, an intercom apparatus according to the present invention comprises: a front-end handset having a handset microphone, a microphone amplifier, a handset speaker, a call switch, a call detection circuit, In an intercom apparatus including a ringing tone generation circuit, an indoor master unit having a handset including a master unit microphone, and a master unit receiver, an entrance slave unit is connected in parallel to a slave unit speaker and transmitted from the ring tone generation circuit. A call confirmation sound mute switch for muting the call confirmation sound, and a call confirmation sound mute capacitor for reducing the impedance of the call confirmation sound by closing the call confirmation sound mute switch.

[0006] In this intercom apparatus, the ringing confirmation sound mute switch and the ringing confirmation sound mute capacitor are inserted in parallel with the child device speaker, so that the ringing sound can be reduced in level and sounded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intercom apparatus according to the present invention will be described below in detail with reference to the drawings. In FIG. 1, the intercom apparatus of the present invention includes a sub-unit microphone 12, a microphone amplifier 13, a sub-unit speaker 14, and a night display L.
Entrance cordless handset 11 having ED 15, ringing switch 16, ringing sound mute switch 17, ringing sound mute capacitor 18, ringing detection circuit 30, ringing tone generating circuit 31, base unit microphone 33-a and base unit An indoor master unit 29 having a handset 33 including a receiver 33-b.

The operation of the intercom apparatus having such a configuration will be described with reference to FIG.

If it is not desired to ring the ringing confirmation sound at a normal volume, such as at night, the ringing switch 16 and the ringing sound mute switch 17 of the entrance terminal 11 are simultaneously depressed. The indoor parent device 29 that has detected the call of the entrance cordless handset 11 notifies the ringing tone generation circuit 31, and the ringing tone generation circuit 31 sends a ringing tone of a certain level to the parent device receiver 33-b and the entrance cordless handset 11. At this time, in the entrance slave unit 11, since the impedance is lowered by the call confirmation sound mute switch 17 and the call confirmation sound mute capacitor 18 inserted in parallel with the slave unit speaker 14, the call confirmation sound sounding from the slave unit speaker 14. Level becomes smaller.

[0010]

As is apparent from the above description, according to the present invention, the volume of the call confirmation sound can be reduced by simultaneously pressing the call switch and the call confirmation sound mute switch.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of a conventional intercom device.

[Description of Signs] 11 ... Entrance cordless handset 12 ... Receiving microphone 13 ... Microphone amplifier 14 ... Transmitting speaker 16 ... Calling switch 17 ... Call confirmation sound mute switch 18 ... Call confirmation sound mute capacitor 29 ... Indoor Base unit 30: Call detection circuit 31: Ring sound generation circuit 33: Handset 33-a: Microphone for transmission 33-b: Receiver for reception

Claims (1)

[Claims] A microphone (12) for a slave unit and an amplifier (1) for a microphone.
3) an entrance slave (11) having a slave speaker (14) and a call switch (16), a call detection circuit (30), a ring tone generation circuit (31), a master microphone (33-a), and In an intercom apparatus configured with an indoor master unit (29) having a handset (33) including a master unit receiver (33-b), the entrance slave unit includes:
A ringing confirmation sound mute switch (17) connected in parallel to the slave unit speaker and muting the ringing confirmation sound sent from the ringing sound generation circuit, and closing the ringing confirmation sound mute switch to generate the ringing confirmation sound; An intercom apparatus comprising: a call confirmation sound mute capacitor (18) for reducing impedance.