Electricity: measuring and testing – Particle precession resonance
Reexamination Certificate
2008-06-12
2009-08-25
Shrivastav, Brij B (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
C324S322000
Reexamination Certificate
active
07579832
ABSTRACT:
An audio system includes a CODEC audio jack having left and right audio ports and a jack sense circuit. The jack sense circuit includes left and right amplifiers and a cross-drive impedance sensing circuit. This cross-drive impedance sensing circuit, which is electrically coupled to the left and right audio ports and the left and right amplifiers, detects the resistances of left and right output loads in order to determine characteristics of a device connected to the CODEC audio jack. The cross-drive impedance circuit is configured to measure a resistance of a left output load electrically coupled to the left audio port, in response to a “right” test signal generated by the right amplifier, and is further configured to measure a resistance of a right output load electrically coupled to the right audio port in response to a “left” test signal generated by the left amplifier.
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IDT Product Brief, “2-Channel, 20-Bit, AC'97 2.3 CODECS with Stereo MIC & Universal Jackson™,” 4 pages, Admitted Prior Art.
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Blackburn Jeffrey
Kanji Ajaykumar
Integrated Device Technology Inc.
Myers Bigel & Sibley & Sajovec
Shrivastav Brij B
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