Electrical audio signal processing systems and devices – With amplifier
Reexamination Certificate
2006-12-14
2011-11-29
Chin, Vivian (Department: 2614)
Electrical audio signal processing systems and devices
With amplifier
C381S055000, C381S111000, C381S116000, C330S278000, C330S279000, C330S297000, C330S298000, C330S051000, C330S199000
Reexamination Certificate
active
08068622
ABSTRACT:
A method and apparatus for controlling a selectable voltage audio power output stage provides a mechanism for raising the selected power amplifier output voltage in time for the arrival of signal peaks to avoid clipping. Signal peaks may either be delayed by delaying an increase in volume control level or enabling signal compression for a predetermined time period, so that sufficient time is provided for the amplifier power supply to stabilize at a higher operating voltage when an increase of power supply voltage is selected. Alternatively, a signal level may be determined at an upstream source, such as a decoder or filter that provides information in sufficient advance of the arrival of the peaks, and used to control the power supply selection, so that the higher power supply voltage level is selected in advance of arrival of the signal peaks that would otherwise cause clipping at the power amplifier output.
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Quilter, Patrick “Amplifier Anatomy”, QSC Audio Products, published in Sound & Video Contractor Feb. 20, 1993.
Melanson John L.
Tucker John Christopher
Chin Vivian
Cirrus Logic Inc.
Harris Andrew M.
Kim Paul
Mitch Harris Atty at Law, LLC
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