Bell sound synthesizer

Details Bell sound synthesizer Bell sound synthesizer

1994-12-23

1997-12-16

Zele, Krista M.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379 88, 379374, H04M 121

Patent

active

056994206

ABSTRACT:
The invention concerns digital synthesis of multiple frequencies a telephone, which are combined, in order to produce a replica of a bell sound. The invention also concerns detection of a power failure, and actuation of a low-power annunciator, which rings when a ring signal is received on a telephone line.

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patent: 5159627 (1992-10-01), Hama
patent: 5195130 (1993-03-01), Weiss et al.
patent: 5323455 (1994-06-01), Le Corre
patent: 5323456 (1994-06-01), Oprea

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