JP3428880B2 - Intercom equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus, and more particularly, to an intercom apparatus which emits a chime sound, which is a ringing sound generated at the time of a call, by a microphone of a handset. 2. Description of the Related Art A conventional intercom apparatus of this type has been proposed as shown in FIG. FIG. 3 (a),
(B) shows indoor master units 51 and 61 installed in the room. The indoor master units 51 and 61 are connected to the indoor master unit via an extendable curl cord, and are usually occupied indoors. A handset 52 used by a user to establish a call with a visitor, and a hook 53 that is turned off / on when the handset 52 is hooked off / on, etc., are provided. [0003] Further, an indoor master unit 61 shown in FIG. 3 (b) is provided with a master unit speaker 62 which is sounded at the time of calling and emits a chime sound as a calling sound. Among the indoor master units constituting such an intercom apparatus, in the indoor master unit 51 shown in FIG. 3A, when the resident hooks off the handset 52 and the hook 53 is turned off, the visitor enters the entrance (the entrance). When the calling operation is performed in the slave unit (not shown), the chime sound is not sounded in the indoor master unit 51. However, when the occupant is raising the handset 52 to the ear and operating the hook 53 with a fingertip or the like, the visitor performs a calling operation at the entrance (entrance cordless handset: not shown). When the user performs the operation, a chime sound is emitted at the occupant's ear from a speaker (not shown) built in the handset 52. In order to prevent the chime sound from being emitted at the ear, the hook is used. The width of 53 was narrowed so that the fingertip of the resident could not be inserted, so that the hook 53 could not be pressed with the fingertip. [0004] In the indoor master unit 61 shown in FIG. 3B, the handset 52 is hooked on and the hook 53 is turned on.
When is turned on, when a visitor performs a calling operation at the entrance (entrance cordless handset: not shown), a chime sound is emitted from the parent device speaker 62 of the indoor parent device 61. When the handset 52 is hooked off and the hook 53 is off, a chime sound is not sounded from the main unit speaker 62 of the indoor main unit 61 even if a visitor performs a calling operation at the entrance. [0005] However, since the conventional intercom apparatus is configured as described above, the indoor master unit 51 shown in FIG. 3A has a chime at the occupant's ear. Since sufficient measures to prevent the sound from sounding have not been taken, it is possible to turn on the hook 53 with a thin object other than the fingertip, such as a ballpoint pen, when the handset 52 is raised. There was a drawback that the chime sound was heard at the occupant's ear. Further, in the indoor master unit 61 shown in FIG. 3B, a chime sound is not generated at the occupant's ear, but in addition to the speaker (not shown) built in the handset 52, Since a speaker (parent device speaker 62) must be added to the indoor parent device 61, there is a problem that a problem of cost UP occurs. SUMMARY OF THE INVENTION The present invention has been made to solve such a disadvantage, and a base unit microphone built in a handset of an indoor base unit is constituted by a dynamic speaker, so that a chime sound which is a ringing sound generated at the time of calling is provided. From a base unit microphone constituted by a dynamic speaker to prevent a chime sound from sounding near the occupant's ear. [0007] In order to achieve the above object, the intercom apparatus of the present invention provides a ringing tone from a chime sound generating circuit in the indoor master unit when a calling button is pressed in the entrance slave unit. In a ringing means, and a handset incorporating a master unit microphone and a master unit speaker is hooked off to make a call with the slave unit microphone of the entrance slave unit and the slave unit speaker, and the master unit microphone is a dynamic microphone. A signal switch that is controlled by the control circuit at the time of calling and sounds from the dynamic speaker as a sounding means from the chime sound generating circuit as a sounding means, and at the time of a call, a signal transmitted from the dynamic speaker to the entrance cordless handset. It has a switch circuit. In such an intercom apparatus, a chime sound (signal) generated and transmitted from the chime sound generation circuit of the indoor master unit at the time of a call when a visitor presses the call button of the entrance slave unit to call a resident in the room. ) Is sounded from a dynamic speaker constituting a base unit microphone incorporated in the handset via a signal changeover switch circuit controlled by a control circuit that has detected that the caller has been called, so that the occupant can hear at the ear. Chime sound (ring tone)
Can be avoided, and the presence of the visitor can be confirmed without feeling discomfort. An embodiment of an intercom apparatus according to the present invention will be described below with reference to the drawings. The intercom apparatus shown in FIG.
And the indoor parent device 2 installed in the room are connected via a transmission line L1. The entrance slave unit 1 has a call button 11 which is pressed by a visitor to call a resident in the room, and a voice signal (a transmission voice signal f) for the visitor to talk with the resident.
4. Remote unit speaker 13 used for transmitting and receiving the reception voice signal f5)
And a handset microphone 12. The transmission voice signal f4 and the reception voice signal f5 are a voice signal for a call transmitted from a resident to a visitor, and a voice signal for a call transmitted from a visitor to a resident, respectively. I do. The indoor base unit 2 is connected to the indoor base unit 2 through elastic curl codes L2 and L3, and usually a resident uses a voice signal (a transmission voice signal) for a call with a visitor. f4, parent device microphone 31 used for transmission and reception of received voice signal f5)
, A handset 21 having a built-in dynamic speaker (hereinafter, referred to as a dynamic speaker 31) and a parent device speaker 32, and a call button 1 of the entrance child device 1.
Call signal f1 via transmission line L1 when 1 is pressed
To detect that the call button 11 has been pressed, a call detection circuit 22 for transmitting a call detection signal f2, a control circuit 23, and a chime for generating and transmitting a chime sound signal f3 based on the call detection signal f2. Sound generation circuit 24
A power amplifier 25 for amplifying and transmitting the chime sound signal f3; and a dynamic speaker 31 built in the handset 21 by selectively switching between the chime sound signal f3 and the transmission voice signal f4 controlled by the control circuit 23.
Switch 26a and switch control circuit 2 for inputting / outputting data from / to
6b, a hybrid circuit 29 for multiplexing and separating the transmission voice signal f4 and the reception voice signal f5, and a transmission circuit for amplifying and transmitting the transmission voice signal f4 and the reception voice signal f5, respectively. Amplifier 27 and a receiver amplifier 28 are provided. The terminal T1 of the slave unit 1 is connected to the transmission line L1.
Is connected to the parent device side terminal T2 of the indoor parent device 2. The base terminal T2 is connected to the input side of the call detection circuit 22 and the multiplexed side of the hybrid circuit 29. The separated input side and the separated output side of the hybrid circuit 29 are the output side of the transmitting amplifier 27 and the receiving amplifier 28, respectively. Each is connected to the input side. The output side of the call detection circuit 22 is connected to the input side of the control circuit 23, and the output side of the control circuit 23 is connected to the input side of the chime sound generation circuit 24 and the signal changeover switch circuit 26.
The output side is connected to the input side of a switching control circuit 26b connected to the changeover switch 26a. The output side of the chime sound generation circuit 24 is connected to the input side of the power amplifier 25, and the output side of the power amplifier 25 is connected to the normally closed contact P2 of the switch 26a. The normally open contact P3 of the changeover switch 26a is connected to the input side of the transmission amplifier 27. The changeover contact P1 of the changeover switch 26a is connected via a curl code L2 to a dynamic speaker 31 incorporated in the handset 21, and the output side of the receiving amplifier 28 is connected to the handset 21 via the curl code L3. It is connected to a built-in master speaker 32. FIG. 2 is a schematic view specifically showing the indoor master unit 2 constituting the intercom apparatus shown in FIG. 1, and shows a state in which the handset 21 is raised and the hook 20 is turned off. The operation of the intercom apparatus configured as described above will be described below. For example, when a resident in the room hooks off the handset 21 and puts it on his ear to turn off the hook 20 shown in FIG. 2, the control circuit 23 detects the hook off by the hook 20, and the signal changeover switch circuit 26 is switched. By controlling the control circuit 26b, the switching control circuit 26b
6a is switched to the normally open contact P3 side. At this time, even if the visitor presses the call button 11 of the entrance cordless handset 1 for calling the resident in the room, the control circuit 23 detects the hook-off and does not activate the chime sound generation path 24, so that the chime sound is not generated. Is not sounded. Also, when a resident in the room is operating the handset 21 so that it is hooked off and put on the ear, and the hook 20 shown in FIG. 2 is turned on with a fingertip or the like (the switching control circuit 2).
6b, the changeover switch 26a is connected to the normally closed contact P2 side), and a call signal f1 generated and transmitted when the visitor presses the call button 11 of the entrance slave unit 1 to call a resident in the room. Is detected by the call detection circuit 22 of the indoor master unit 2 via the slave terminal T1, the transmission path L1, and the master terminal T2, and the call detection signal f2 is input to the control circuit 23. The control circuit 23, which has detected the input of the call detection signal f2, activates the chime sound generation circuit 24, so that the chime sound signal f3 generated and transmitted from the chime sound generation circuit 24 is amplified via the power amplifier 25. Then, a chime sound is emitted from the dynamic speaker 31 incorporated in the handset 21 via the normally closed contact P2, the switching contact P1, and the curl code L2 of the switch 26a. Therefore, the resident can confirm the presence of the visitor without feeling uncomfortable by listening to the chime sound ringing at the time of the call operation of the visitor other than at the ear. When the handset 21 is hooked off and the hook 20 is turned off in response to the chime sound, the transmission voice signal f4, which is a voice signal for a telephone call, is input from the dynamic speaker 31, so that the transmission voice is transmitted. The signal f4 is input to the changeover contact P1 of the changeover switch 26a via the curl code L2. The transmission voice signal f4 is transmitted from the changeover contact P1 of the changeover switch 26a to the normally open contact P3, the transmission amplifier 27, the hybrid circuit 29, the master unit side terminal T2, the transmission path L1, and the slave unit side terminal T1. It is transmitted from the slave speaker 13 of the slave 1. On the other hand, the reception voice signal f5 which the visitor inputs to the slave unit microphone 12 of the entrance slave unit 1 for a call is transmitted to the slave terminal T1, the transmission line L1, the master terminal T2 and the hybrid circuit 29. Intermediate receiver amplifier 28, curl code L3
Is transmitted from the parent device speaker 32 built in the handset 21 via the. As a result, it is possible to transmit and receive voice signals (transmitted voice signal f4 and received voice signal f5) for a call, and the call is established. In the above description, the method of sounding the chime sound (chime sound signal f3) while the occupant of the room is hooking off the handset 21 and the voice signal for the call (the transmission voice signal f4, Received voice signal f5)
As described above, even when the handset 21 is hooked on and the hook 20 is turned on, the chime sound (chime sound signal f3) is sounded from the dynamic speaker 31 built in the handset 21. You. As is apparent from the above description, according to the intercom apparatus of the present invention, the chime sound is generated by the microphone constituted by the dynamic speaker regardless of the hook-off / hook-on of the handset. With this configuration, it is possible to avoid a chime sound at the occupant's ear at the time of calling.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit block diagram showing an embodiment of an intercom apparatus of the present invention. FIG. 2 is an outline view showing an indoor master unit and a handset constituting the intercom apparatus shown in FIG. FIG. 3 is a block diagram showing a conventional intercom apparatus. [Description of Signs] 1... Entrance cordless handset 2... Indoor master unit 11... Call button 12. ··········································································································· Dynamic speaker (base unit microphone) ... Master speaker

Claims (1)

(57) [Claim 1] When the call button (11) is pressed on the entrance slave unit (1), the chime sound generation circuit (2) is activated on the indoor master unit (2).
The ringing means from (4) is sounded by the ringing means, and the handset (21) including the parent device microphone (31) and the parent device speaker (32) is hooked off, so that the child device microphone (12) and the child An intercom apparatus for making a telephone call with a main unit speaker (13), wherein the base unit microphone is constituted by a dynamic speaker, and is controlled by a control circuit (23) at the time of calling to generate a ringing sound from the chime sound generating circuit. An intercom apparatus comprising: a signal switching switch circuit (26) for sounding from the dynamic speaker as the sounding means, and transmitting a transmission voice from the dynamic speaker to the entrance device during a call.