Ringing generator for telephones

Details Ringing generator for telephones Ringing generator for telephones

1991-06-21

1995-08-15

Dwyer, James L.

Telephonic communications

Call signal generating

379372, 379252, 379253, 363 65, H04M 302

Patent

active

054426987

ABSTRACT:
A ringing generator includes a binary signal source generating a waveform with eight degrees of freedom controlled to suppress or cancel certain harmonics to produce a binary low frequency signal substantially free of low frequency components other than the desired ringing frequency. The binary signal is amplified and filtered to remove unwanted frequency components above a certain threshold to produce a substantially sinusoidal ringing signal.

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