Pop sound reduction circuit and voice output amplification...

Details Pop sound reduction circuit and voice output amplification... Pop sound reduction circuit and voice output amplification...

2006-11-28

2006-11-28

Choe, Henry (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C381S094100

Reexamination Certificate

active

07142048

ABSTRACT:
A pop sound reduction circuit comprises a pulse width modulation amplifier configured to amplify a reference voltage to an intermediate amplitude of a pulse width modulated signal, a first switch configured to activate and deactivate the pulse width modulation amplifier, a buffer amplifier configured to generate a DC voltage equal to the reference voltage, a second switch configured to activate and deactivate the buffer amplifier, and a control circuit configured to close and open the first and second switches complementary, depending on a potential in a leading region of the reference voltage which rises from a time of turning-on of a power source as well as a potential in a trailing region of the reference voltage which falls from a time of turning-off of the power source.

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