Sound quality enhancement circuit for audio signals and...

Details Sound quality enhancement circuit for audio signals and... Sound quality enhancement circuit for audio signals and...

2004-10-08

2010-02-02

Faulk, Devona E (Department: 2614)

Electrical audio signal processing systems and devices

Including phase control

C381S098000, C381S099000, C381S100000, C381S103000, C381S061000, C333S02800T, C333S02800T

Reexamination Certificate

active

07657039

ABSTRACT:
The present invention comprises a circuit having at least not less than three cascade connected phase shift circuits and wherein the phase characteristic of the circuit is determined in such a manner that the phase of the audio input signals is gradually delayed depending on logarithmic increase of frequencies in a range of audible frequencies and a phase delay in a range of 450 degree˜600 degree in total in the range of audible frequencies is caused.

REFERENCES:
patent: 4566119 (1986-01-01), Peters
patent: 4748669 (1988-05-01), Klayman
patent: 2609065 (1997-05-01), None
Applicant's admitted prior art, p. 4, line 1-p. 6, line 16.

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