Sub-harmonic generator and stereo expansion processor

Details Sub-harmonic generator and stereo expansion processor Sub-harmonic generator and stereo expansion processor

2006-11-14

2006-11-14

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Sound effects

C381S098000

Reexamination Certificate

active

07136493

ABSTRACT:
A sub-harmonic generator includes: an input filter operable to receive an input signal containing frequencies from among a first range and to produce a first intermediate signal containing frequencies from among a second range; a signal divider circuit operable to receive the first intermediate signal and to produce a square wave signal containing square wave signal components at fundamental frequencies from among a third range, the third range of frequencies being about one octave below the second range of frequencies; a wave-shaping circuit operable to receive the square wave signal and to produce a second intermediate signal containing sinusoidal signal components from among frequencies corresponding to the respective fundamental frequencies of the square wave signal components; an RMS detector operable to produce an RMS signal corresponding to an instantaneous amplitude of the first intermediate signal; and a voltage controlled amplifier operable to amplify the second intermediate signal by an amount proportional to the RMS signal to produce a sub-harmonic signal.

REFERENCES:
patent: 4182930 (1980-01-01), Blackner
patent: 4841572 (1989-06-01), Klayman
patent: 4866774 (1989-09-01), Klayman
patent: 5369224 (1994-11-01), Miyata
patent: 5440638 (1995-08-01), Lowe et al.
patent: 5473108 (1995-12-01), Matsuda et al.
patent: 5619578 (1997-04-01), Sondemeyer et al.
patent: 5647004 (1997-07-01), Sondemeyer et al.
patent: 5774556 (1998-06-01), Lowe et al.
patent: 5822437 (1998-10-01), Winterer
patent: 6023513 (2000-02-01), Case
patent: 6111960 (2000-08-01), Aarts et al.
patent: 6122381 (2000-09-01), Winterer
patent: 6134330 (2000-10-01), De Poortere
patent: 6307941 (2001-10-01), Tanner et al.
patent: 6335973 (2002-01-01), Case
patent: 6504935 (2003-01-01), Jackson
patent: 6845165 (2005-01-01), Motohashi
patent: 2003/0044024 (2003-03-01), Aarts et al.
patent: 0994464 (2000-04-01), None
120XP Subharmonic Synthesizer, A Harman International Company, Nov. 5, 1997, pp. 1-2.
M51134P, FP Sub-Hormonizer For Bass Emphasis, Mitsubishi Sound Processor Ics, pp. 4-182-4-183.
U.S. Appl. No. 10/158,628, filed May 30, 2002, Trammell et al.
U.S. Appl. No. 10/957,936, filed Oct. 4, 2004, Trammell et al.

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