Integrated circuit device and audio system

Details Integrated circuit device and audio system Integrated circuit device and audio system

2008-07-01

2011-11-01

Pizarro, Marcos D. (Department: 2814)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

C381S120000, C381S121000, C330S010000, C330S069000

Reexamination Certificate

active

08050423

ABSTRACT:
An n-channel integrated circuit device (n is an integer of 1 or greater) for muting an audio signal includes a control circuit configured to generate a control signal and a delayed control signal, a charging and discharging circuit configured to charge and discharge a time constant control terminal according to the control signal and the delayed control signal, an N-th voltage-to-current converting circuit (N is an integer from 1 to n) configured to generate a (2N−1)-th current corresponding to a voltage on the time constant control terminal and a (2N)-th current corresponding to an intermediate voltage, a (2N−1)-th mirror circuit configured to copy the (2N−1)-th current to generate (4N−3)-th and (4N−2)-th intermediate currents, a (2N)-th mirror circuit configured to copy the (2N)-th current to generate (4N−1)-th and (4N)-th intermediate currents, a (2N−1)-th selecting and combining circuit configured to combine a (2N−1)-th mute control current using the (4N−3)-th intermediate current and the (4N−1)-th intermediate current, and a (2N)-th selecting and combining circuit configured to combine a (2N)-th mute control current using the (4N−2)-th intermediate current and the (4N)-th intermediate current.

REFERENCES:
patent: 5796303 (1998-08-01), Vinn et al.
patent: 2005-295011 (2005-10-01), None
patent: 2006-093975 (2006-04-01), None
patent: 2006093975 (2006-04-01), None
patent: 2006-262264 (2006-09-01), None
patent: 2006262264 (2006-09-01), None
patent: 2007-214633 (2007-08-01), None
Japanese Office Action for Application No. 2007-174413 mailed on Feb. 18, 2011.

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