Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-07-25
2010-06-01
Shingleton, Michael B (Department: 2815)
Amplifiers
Modulator-demodulator-type amplifier
C330S149000, C330S150000, C330S20700P, C330S284000, C332S107000, C381S120000
Reexamination Certificate
active
07728658
ABSTRACT:
Systems and methods for performance improvements in digital switching amplifiers using low-pass filtering to reduce noise and distortion. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low-pass filter configured to filter audio signals output by the plant. The filtered output of the plant is added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC.
REFERENCES:
patent: 5303142 (1994-04-01), Parsons et al.
patent: 5553153 (1996-09-01), Eatwell
patent: 5680450 (1997-10-01), Dent et al.
patent: 5692055 (1997-11-01), Sano et al.
patent: 5815582 (1998-09-01), Claybaugh et al.
patent: 5901059 (1999-05-01), Tao et al.
patent: 6593806 (2003-07-01), Melanson
patent: 6825722 (2004-11-01), Segawa
patent: 7149590 (2006-12-01), Martin et al.
patent: 7239257 (2007-07-01), Alexander et al.
patent: 7277764 (2007-10-01), Hovakimyan et al.
patent: 7286009 (2007-10-01), Andersen et al.
patent: 2002/0111758 (2002-08-01), Wang et al.
patent: 2003/0060902 (2003-03-01), Miller
patent: 2004/0125003 (2004-07-01), Craven et al.
patent: 2005/0024133 (2005-02-01), Midya
patent: 2005/0502229 (2005-03-01), Makoto
patent: 2007/0156262 (2007-07-01), Craven
patent: 0 712 115 (1996-05-01), None
patent: 1 003 154 (2000-05-01), None
patent: 1406381 (2001-04-01), None
patent: 59 183510 (1984-10-01), None
patent: WO0030250 (2000-05-01), None
patent: WO0197384 (2001-12-01), None
patent: WO 03/015263 (2003-02-01), None
patent: WO0315263 (2003-02-01), None
patent: WO 2004/049561 (2004-06-01), None
European Search Report for European Application No. 06846841.2.
Andersen Jack B.
Chieng Daniel L. W.
Craven Peter G.
Hand Larry E.
Kost Michael A.
D2Audio Corporation
Fliesler & Meyer LLP
Shingleton Michael B
LandOfFree
Low-noise, low-distortion digital PWM amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low-noise, low-distortion digital PWM amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-noise, low-distortion digital PWM amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4183918