Muting circuit for loudspeaker

Details Muting circuit for loudspeaker Muting circuit for loudspeaker

1978-01-30

1978-11-28

Stellar, George G.

325478, H04R 300

Patent

active

041277430

ABSTRACT:
A muting circuit for loudspeakers is operable to disconnect a loudspeaker from an amplifier immediately upon a power supply being interrupted. The muting circuit includes an around-zero-volt detection circuit for detecting around the zero volt level of a commercial AC voltage. An RC time constant circuit is controlled by the output of the around-zero-volt detection circuit to either charge or discharge the capacitor in the RC time constant circuit only when the around zero volt level is detected. A threshold circuit is connected to the RC time constant circuit and operates a loudspeaker relay when the charge on the capacitor either exceeds or decreases below a predetermined level.

REFERENCES:
patent: 3622900 (1971-11-01), Hanus et al.
patent: 3840820 (1974-10-01), Kawada
patent: 3916321 (1975-10-01), Morse
patent: 3965295 (1976-06-01), Evans et al.

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