Audio output apparatus capable of suppressing pop noise

Details Audio output apparatus capable of suppressing pop noise Audio output apparatus capable of suppressing pop noise

2008-12-18

2011-10-11

Louie, Wai Sing (Department: 2814)

Electrical audio signal processing systems and devices

Noise or distortion suppression

C381S094500, C381S094700, C381S094800, C381S094900, C381S120000, C381S123000

Reexamination Certificate

active

08036399

ABSTRACT:
An audio output apparatus includes: an audio codec outputting an analog audio signal corresponding to a digital audio signal from a system controller; a switch unit having a first end coupled to the audio codec through a capacitor, and a grounded second end; and a switch controller triggered by a trigger signal to output a control signal to a control end of the switch unit such that the switch unit couples the capacitor to ground in response to the control signal. The trigger signal is generated by one of the system controller, the audio codec, and a power circuit supplying electric power to the system controller, the audio codec and the switch controller upon occurrence of a condition associated with pop noise, and is outputted to the switch controller before the pop noise is generated, such that the pop noise is conducted to ground via the switch unit.

REFERENCES:
patent: 6802018 (2004-10-01), Bormann et al.
patent: 2004/0240918 (2004-12-01), Soman et al.
patent: 2006/0025833 (2006-02-01), Daly

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