Music on hold for key systems

Details Music on hold for key systems Music on hold for key systems

1984-07-12

1986-05-13

Dwyer, James L.

H04M 332

Patent

active

045888655

ABSTRACT:
A music on hold system is provided for key telephone systems having key stations, central office lines, and a muting relay for load resistance termination of the central office lines when they are on hold. A music source provides a music signal which is applied to the muting relay. When the telephone system controller receives a hold command from a key station, it generates a hold signal and applies the hold signal to the muting relay. In response to the hold signal, the muting relay applies the music signal to the central office line. Before being applied to the muting relay, the music signal is conditioned by passage through a gain control, a high frequency cut off filter, an amplifier, and a DC level shifter.

REFERENCES:
patent: 4011413 (1977-03-01), Phillips
patent: 4066847 (1978-01-01), Giordano
patent: 4243844 (1981-01-01), Waldman
patent: 4365117 (1982-12-01), Curtis
patent: 4376875 (1983-03-01), Beirne
patent: 4408102 (1983-10-01), Lumpkin
patent: 4429187 (1984-01-01), Butcher
patent: 4445003 (1984-04-01), Alderman

Affiliated with

Also associated with

Rating

Music on hold for key systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Music on hold for key systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Music on hold for key systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1771540