Shock sound prevention circuit

Details Shock sound prevention circuit Shock sound prevention circuit

2005-09-06

2005-09-06

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

C330S297000, C330S051000

Reexamination Certificate

active

06940985

ABSTRACT:
A shock sound prevention circuit which makes a BTL audio amplifier operate stable 100 msec after turning-on of a power supply is offered. The shock sound prevention circuit includes a terminal for reference voltage which rises according to turning-on of a power supply, a first operational amplifier to which the reference voltage is applied as a bias voltage and amplifies the audio signal input from an input terminal, a second operational amplifier to which the reference voltage from the terminal for reference voltage is applied as a bias voltage and amplifies a reverse signal of the audio signal applied to the first operational amplifier, a first and a second buffers to which the reference voltage is applied, a first output terminal to which an output of the first operational amplifier and an output of the first buffer are connected together, and a second output terminal to which an output of the second operational amplifier and an output of the second buffer are connected together.

REFERENCES:
patent: 4433306 (1984-02-01), Honda et al.
patent: 5101170 (1992-03-01), Torazzina et al.

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