Method for varying the interpolation ratio of a digital oversamp

Details Method for varying the interpolation ratio of a digital oversamp Method for varying the interpolation ratio of a digital oversamp

1993-04-06

1994-05-17

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, H03M 166

Patent

active

053132050

ABSTRACT:
A digital oversampling digital-to-analog converter system includes an interpolator, a sigma-delta modulator, a digital-to-analog converter and a low pass filter. The interpolator receives a digital input signal and upsamples the input signal by certain upsampling factor. The upsampled signal is processed by the sigma-delta modulator, converted to an analog signal by the digital-to-analog converter and then filtered by the low pass filter. The interpolator includes control circuitry, preferably a central processor, which controls the upsampling factor and increases the upsampling factor upon a decrease in the frequency of the input signal.

REFERENCES:
patent: 4542369 (1985-09-01), Kasuga
patent: 4890106 (1989-12-01), Belcher
patent: 5061925 (1991-10-01), Sooch et al.
patent: 5157396 (1992-10-01), Yoshio

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