Bass enhancement for audio

Electrical audio signal processing systems and devices – Sound effects

Reexamination Certificate

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C381S098000, C381S097000

Reexamination Certificate

active

08005233

ABSTRACT:
A method and apparatus for conditioning an audio input signal to enhance perception and reproduction of bass frequencies. Harmonics are generated and combined with a phase-shifted version of the audio input signal. Use of a controlled phase shift reduces or eliminates unwanted introduction of waveform asymmetry or D.C. offset.

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patent: 7031474 (2006-04-01), Yuen
patent: 2008/0103763 (2008-05-01), Shimura et al.

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