Digital signal conversion apparatus, digital signal...

Details Digital signal conversion apparatus, digital signal... Digital signal conversion apparatus, digital signal...

2005-03-29

2005-03-29

jeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000, C375S238000

Reexamination Certificate

active

06873275

ABSTRACT:
The digital signal conversion apparatus comprises: an over-sampling circuit that samples the input digital signal at high frequency; a polarity-inversion circuit that inverts the polarity of the sampled digital signal; interpolation circuit (A) and interpolation circuit (B) that perform interpolation of each respective digital signal; noise-shaping circuit (A) and noise-shaping circuit (B) that perform noise shaping on the interpolated signals; PWM conversion circuit (A) and PWM conversion circuit (B) that perform PWM conversion on the noise-shaped signals; and a switching circuit for driving a load based on the PWM signals from PWM conversion circuit (A) and PWM conversion circuit (B).

REFERENCES:
patent: 4825144 (1989-04-01), Alberkrack et al.
patent: 5548286 (1996-08-01), Craven
patent: 5617058 (1997-04-01), Adrian et al.
patent: 6373336 (2002-04-01), Anderskouv et al.
patent: 6642875 (2003-11-01), Harada et al.
patent: 1 050 971 (2000-11-01), None
patent: 61065513 (1986-04-01), None

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