Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Patent
1999-04-27
2000-02-22
Isen, Forester W
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
381117, 330251, 330207A, H04R 300
Patent
active
060289430
ABSTRACT:
Class D amplifiers are difficult to incorporate into audio amplifier systems because of the interference created by the amplifier and/or the surrounding circuits. The modulation frequencies f1 and f2 of two class D amplifiers in an audio amplifier system are adjusted so that the frequency f1-f2 of interference between the modulation frequencies is outside the reproducible frequency band B1 of speakers converting the class D amplifier output to audible sound. As a result, interference that may result from simultaneous use of two class D amplifiers for similar purposes is inaudible and not perceived as noise.
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English language abstract of Japanese Publication 5-160649
English language abstract of Japanese Publication 6-303049
Isen Forester W
Matsushita Electric - Industrial Co., Ltd.
Mei Xu
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