Analog to digital and digital to analog signal processors

Details Analog to digital and digital to analog signal processors Analog to digital and digital to analog signal processors

H - Electricity

03

M

H03M 3/02 (2006.01) G11B 20/10 (2006.01) H03M 1/14 (2006.01) H03M 1/68 (2006.01)

Patent

CA 2042539

ABSTRACT Improved analog to digital and digital to analog signal processors are disclosed wherein a quick approximation of the input signal to the signal processor i. attained and a more accurate approximation is later attained for the input signals For the analog to digital conversion, a standard analog to digital converter having a finite resolution or a predetermined quantization error is used to create part of the digital representation. The remainder of digital representation is created by processing an error signal due to the finite resolution of a standard analog to digital convertor and the infinite resolution of the analog input signal to a delta modulator. In a digital to analog signal processing circuit, the first part of the digital representation is converted by a standard digital' to analog converter and the remaining portion is integrated into a frequency limited analog signal and then summed to reconstruct the analog signal. To avoid overshoot, the integrators of the signal processor are preset based upon the increase or the decrease in the first part. Further, the rate of integration is controlled so that the rate slows as the digital representation of the analog signal become increasingly more accurate representation of the input signal.

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