Audio player using sigma-delta pulse-width modulation

Details Audio player using sigma-delta pulse-width modulation Audio player using sigma-delta pulse-width modulation

2005-09-28

2008-10-21

Fletcher, Marlon T (Department: 2837)

Music

Instruments

Electrical musical tone generation

C330S010000, C341S143000

Reexamination Certificate

active

07439440

ABSTRACT:
An audio player using sigma-delta pulse-width modulation includes a Δ-Σ PWM unit, a drive unit, a speaker unit, and an error prediction unit. The Δ-Σ PWM unit receives an input signal and generates a pulse-width modulation (PWM) signal by means of sigma-delta pulse-width modulation. The drive unit receives the PWM signal and generates a drive signal, and the speaker unit receives the drive signal to produce sound. The error prediction unit receives the PWM signal and generates a predicted feedback signal for the Δ-Σ PWM unit according to stored error data.

REFERENCES:
patent: 6795004 (2004-09-01), Masuda et al.
patent: 6822594 (2004-11-01), Melanson et al.
patent: 7020219 (2006-03-01), Panasik et al.
patent: 7142144 (2006-11-01), Farooqi et al.
patent: 7259618 (2007-08-01), Hand et al.
patent: 2005/0058209 (2005-03-01), Magrath
patent: 2005/0068212 (2005-03-01), Jensen
patent: 2006/0098762 (2006-05-01), Wojtiuk
patent: 2006/0158359 (2006-07-01), Magrath
patent: 2007/0057720 (2007-03-01), Hand et al.

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