Circuit and method for eliminating pop noise in digital...

Details Circuit and method for eliminating pop noise in digital... Circuit and method for eliminating pop noise in digital...

2007-12-25

2007-12-25

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

Reexamination Certificate

active

10527677

ABSTRACT:
Provided are a circuit for and a method of eliminating pop noise in a digital audio amplifier using dual power supply, which are simple, drop in price, and can be readily implemented in a semiconductor chip. According to an existing technique, pop noise is eliminated using a relay. However, in the present circuit and method, pop noise is eliminated using the small number of discrete electronic devices. The circuit for eliminating pop noise controls a voltage at a gate of a power switch, i.e., a power MOS transistor, when power supply voltages are applied and the application of power supply voltages is stopped.

REFERENCES:
patent: 5162752 (1992-11-01), Padi
patent: 5883495 (1999-03-01), Smith et al.
patent: 6169449 (2001-01-01), Hasegawa
patent: 6597240 (2003-07-01), Walburger et al.

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