Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2003-09-19
2008-01-08
Nguyen, Patricia (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S107000, C375S297000
Reexamination Certificate
active
07317353
ABSTRACT:
An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of a distortion component contained in the amplified signal after distortion compensation has become large. Distortion component amplitude detection means7and8detect the amplitude of distortion components produced by the amplifier4that are contained in signals amplified by the amplifier4after distortion compensation, and when the amplitude of a detected distortion component exceeds a predetermined threshold value, amplified signal level reduction control means9and1perform control to reduce the level of the signal amplified by the amplifier4. In the distortion compensation, the predistortion circuit3generates distortion in respect of a signal that has not yet been amplified by the amplifier4, and based on the detected amplitude of the distortion component, predistortion control means9controls the distortion produced by the predistortion circuit3.
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Hitachi Kokusai Electric Inc.
Nguyen Patricia
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