Apparatus and method for muting an output signal in a switching

Details Apparatus and method for muting an output signal in a switching Apparatus and method for muting an output signal in a switching

1985-12-16

1987-06-16

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 51, 330149, 330251, H03F 338

Patent

active

046738894

ABSTRACT:
In an audio switching power amplifier, muting apparatus provided for eliminating noise signals associated with turn-on and turn-off operations of the apparatus is disclosed. The muting apparatus disables the output power amplifiers and controls signal levels at various positions in the power amplifier to reduce transient conditions. Control apparatus applies the muting signals to the power amplifier during a predetermined period during start-up of the amplifier and applies the muting conditions immediately upon the turning off of power to the power amplifier.

REFERENCES:
patent: 3889202 (1975-06-01), Suzuki
patent: 3976955 (1976-08-01), Hamada
Klynin, "Direct-Current Amplifier with Frequency-Pulse-Width Modulation", Instrum. & Exp. Tech. vol. 19, No. 5, Sep.-Oct. 1976, pp. 1415-1417.

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