Electronic ring sounder for a speaker telephone

Details Electronic ring sounder for a speaker telephone Electronic ring sounder for a speaker telephone

1979-11-20

1982-02-09

Konick, Bernard

179 81B, H04M 126

Patent

active

043151094

ABSTRACT:
This electronic ring sounder utilizes the loudspeaker and audio amplifier present in a speaker telephone to accomplish the bell sounding function. To this end, the amplifier is provided with a feedback circuit which, when enabled, causes the amplifier to oscillate in the audio frequency range. The feedback path includes a gate which is enabled in response to presence of the ring tone on the telephone line. Advantageously, the oscillation frequency is on the order of 1,000 Hz, and is gated on each half cycle of the ring signal. This produces a sound which closely simulates that of a conventional telephone bell.

REFERENCES:
patent: 3459899 (1969-08-01), Lane et al.
patent: 3594515 (1971-07-01), Brown
patent: 3789155 (1974-01-01), Fensom

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