Digital saturation handling in integral noise shaping of...

Details Digital saturation handling in integral noise shaping of... Digital saturation handling in integral noise shaping of...

2007-06-05

2007-06-05

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S143000, C341S155000

Reexamination Certificate

active

11273286

ABSTRACT:
An audio amplifier includes a digital signal processor (DSP) that contains a noise shaping quantizer having an integrating error amplifier. The integrating error amplifier contains integrators connected in a feedback loop, a summer supplied with an output of each of the integrators, and a saturation function module producing a saturation function. A multiplier is disposed between each pair of adjacent integrators. The multiplier receives a signal from one of the adjacent integrators and the saturation function and supplies a signal to the other of the adjacent integrators. The saturation function decreases the effect of all of the integrators except an integrator to which an input signal to the integrating amplifier is supplied using an input signal to and/or an output signal from the noise shaping quantizer. This permits the duty ratio of the output signal from the noise shaping quantizer to extend from 0% to 100%.

REFERENCES:
patent: 6232899 (2001-05-01), Craven
patent: 6414613 (2002-07-01), Midya et al.
patent: 6700518 (2004-03-01), Kishida
patent: 6924757 (2005-08-01), Adams et al.
patent: 7081793 (2006-07-01), Morris et al.

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