Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1996-11-18
1998-04-07
Isen, Forester W.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
381107, 381100, H04B 1500
Patent
active
057374325
ABSTRACT:
A split-band clipper which generates less distortion, minimizes or reduces the occurrence of all IMD, or at least will minimize and reduce the occurrence of widely space IMD, and reduce the quantity of harmonic distortion caused by clipping of bass frequencies. The split-band clipper has a crossover for splitting an input signal into a lowpass output signal and a highpass output signal; a variable clipping is coupled to the lowpass output of the crossover to output a variably clipped lowpass signal; a summing for adding together the highpass output of the crossover and the variably clipped output of the variable clipper and outputting a summed signal; a fixed clipper to clip the summed signal at a fixed threshold level; an intermodulation detector to measure or estimate the amount of high frequency clipping in the fixed clipper caused by presence of low frequencies; and the intermodulation detector coupled to the variable clipper to reduce the threshold of clipping of low frequencies by the variable clipper whenever high frequency clipping is detected in the fixed clipper as a result of the presence of low frequencies.
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Aphex Systems Ltd.
Chen Tony D.
Isen Forester W.
Rozsa Thomas I.
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