Integrated Device Technology Assigned Patent
(Targeted News Service Via Acquire Media NewsEdge) By Targeted News Service
ALEXANDRIA, Va., April 19 -- Integrated Device Technology, San Jose, Calif., has been assigned a patent (8,160,272) developed by Jeffrey Blackburn, Lakeway, Texas, and Ajaykumar Kanji, Austin, Texas, for an "audio output circuits having ramped attenuation circuits that inhibit pop disturbances when audio sources are switched."
The abstract of the patent published by the U.S. Patent and Trademark Office states: "An audio output circuit includes a port attenuation circuit, which is configured to convert an abrupt dc voltage offset transition between a pair of audio signals received in sequence at an input thereof into a more gradual transition. This conversion is achieved by performing, in sequence, a ramp-to-mute operation on a first of the pair of audio signals and a ramp-from-mute operation on a second of the pair of audio signals. The ramp-to-mute operation includes ramping an output of the audio output circuit from a dc voltage offset associated with the first of the pair of audio signals to a reference dc voltage offset. The ramp-from-mute operation includes ramping the output of the audio output circuit from the reference dc voltage offset to a dc voltage offset associated with the second of the pair of audio signals. These ramping operations may be performed using voltage steps having uniform step size."
The patent application was filed on July 15, 2008 (12/173,564). The full-text of the patent can be found at http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=8,160,272&OS=8,160,272&RS=8,160,272
Written by Arpi Sharma; edited by Anand Kumar.
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