Circuitry for converting a sampled digital signal to a...

Details Circuitry for converting a sampled digital signal to a... Circuitry for converting a sampled digital signal to a...

2000-01-05

2003-12-16

Chin, Stephen (Department: 2634)

Pulse or digital communications

Pulse width modulation

C341S200000

Reexamination Certificate

active

06665338

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to digital amplifiers, and more specifically to converting a sampled digital signal to a naturally sampled digital signal.
RELATED ART
Pulse-width modulation (PWM) is widely used in a variety of applications such as digital audio amplifiers and control applications including motor controllers. Many of these applications convert a sampled digital signal to a pulse-width modulation signal in order to obtain high efficiency and high accuracy. However, as accuracy increases, so does the amount and complexity of the computations required to perform the signal conversion. A uniformly sampled PWM signal requires less computation but has distortion and no linearity. On the other hand, while more complicated to compute, a naturally sampled PWM signal maintains both linearity and signal integrity. Therefore, a need exists for a computationally efficient method for converting a uniformly sampled signal to a naturally sampled signal which may then be used to produce a naturally sampled PWM signal.


REFERENCES:
patent: 6031481 (2000-02-01), Craven
patent: 6098046 (2000-08-01), Cooper et al.
patent: 6232899 (2001-05-01), Craven
patent: 6359576 (2002-03-01), Petrofsky

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