Claims
- 1. In a key telephone system wherein a plurality of key telephone sets are connected to a central office via a central office line, each of said key telephone sets having a transmitter, a talking circuit network, and a loudspeaker circuit for signalling an intercom call, and wherein each of said loudspeaker circuits signals said intercom call, an intercom calling apparatus comprising:
- a two-position page switch;
- means for electrically connecting the transmitter to the talking circuit network when the page switch is in a first position;
- means for electrically connecting the transmitter to the loudspeaker circuit in each of said key telephone sets when the page switch is in a second position; and
- means for holding the connection of the talking circuit network with a central office line by a series combination of a resistor and a varistor forming a parallel circuit with the transmitter in the talking circuit network at the same time the page switch is changed to the second positon.
- 2. The intercom calling apparatus recited in claim 1, wherein the connecting means to the loudspeaker comprises:
- an intercom calling path having a d.c. power source for activating the transmitter; and
- means for picking up a voice signal in the intercom calling path to energize the loudspeaker.
- 3. The intercom calling apparatus as recited in claim 2, wherein the voice signal picking up means comprises:
- a transformer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
50/123062 |
Oct 1975 |
JPX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a Continuation-In-Part application for application Ser. No. 726,230 filed Sept. 24, 1976 and now abandoned.
US Referenced Citations (7)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
726230 |
Sep 1976 |
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