Pulsed volume control of a magnetic ringer

Details Pulsed volume control of a magnetic ringer Pulsed volume control of a magnetic ringer

2005-09-13

2005-09-13

Tran, Sinh (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

C379S375010, C379S418000, C381S104000

Reexamination Certificate

active

06944284

ABSTRACT:
A digital circuit for driving an audio transducer that provides consistent tonal quality over a range of volume levels, without requiring a variable gain analog amplifier. A fixed amplitude ringer tone is multiplied, or amplitude modulated, by a higher frequency digital pulse train to produce a transducer driving signal. The timbre of the transducer driving signal is similar to that of the fixed amplitude ringer tone, but the volume of the sound produced by the transducer varies with the mark-space ratio of the pulse train.

REFERENCES:
patent: 4644106 (1987-02-01), Yeh
patent: 5323456 (1994-06-01), Oprea
patent: 5802187 (1998-09-01), Hsu
patent: 42 18 655 (1992-12-01), None
patent: 2259 775 (1992-12-01), None
English Translation of German Office Action.
GB Search Report.

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