Shock sound prevention circuit

Details Shock sound prevention circuit Shock sound prevention circuit

2005-07-26

2005-07-26

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

06922474

ABSTRACT:
A shock sound prevention circuit which provides a BTL audio amplifier with stable operation about 100 msec after turning-on of a power supply is required. Since the BTL audio amplifier is usually integrated in an IC, use of capacitors which takes up a large pattern area on the IC chip needs to be minimized. This invention offers a shock sound prevention circuit which has a capacitance for reference voltage to generate a reference voltage which rises according to turning-on of a power supply, a first operational amplifier to which an audio signal input and the reference voltage are applied, a second operational amplifier to which a reverse signal of the audio signal input and the reference voltage are applied, a first and a second buffers to which the reference voltage is applied and a level comparator which compares a voltage of the power supply with the reference voltage.

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

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