Patent
1978-09-21
1980-08-26
Moffitt, James W.
179 99LC, H04M 172
Patent
active
042197015
ABSTRACT:
A two-terminal tone generating hold impedance is disclosed which is powered from a central office telephone line and provides the functions of a hold impedance in a key telephone line circuit while providing an audio tone signal to an associated telephone line when the line is placed in a hold condition. The tone generating hold impedance consists of an oscillator circuit which is self-exciting upon the application of a dc voltage resulting from the connection of the tone generating hold impedance to the telephone line. In another embodiment a line powered music receiver functions as a hold impedance and applies music, received via radio or cable transmission, to the line placed in a hold condition.
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Bell Telephone Laboratories Incorporated
Caccuro John A.
Moffitt James W.
Myers Randall P.
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