Sigma-delta modulation

Details Sigma-delta modulation Sigma-delta modulation

2005-12-13

2005-12-13

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C118S120000

Reexamination Certificate

active

06975257

ABSTRACT:
Sigma-delta modulation is provided, comprising feeding an input signal to a first SDM, subtracting the output of the first SDM from the input signal, filtering the output of the subtracting to obtain a filtered signal, delaying the input signal, adding the filtered signal to the delayed signal, feeding the output of the adder to a second SDM and providing the output of the second SDM. The first SDM in combination with the subtracting and filtering delivers a correction signal which, by adding it to the input signal, reduces the distortion in the second SDM, which second SDM performs in fact the sigma-delta modulation of the device.

REFERENCES:
patent: 5103229 (1992-04-01), Ribner
patent: 5341135 (1994-08-01), Pearce
patent: 5768315 (1998-06-01), Mittel et al.
patent: 6232900 (2001-05-01), Hendricks et al.
patent: 6577259 (2003-06-01), Jelonnek

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