Digital to analog conversion using non-uniform sample rates

Details Digital to analog conversion using non-uniform sample rates Digital to analog conversion using non-uniform sample rates

1995-01-17

1996-02-06

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341 61, 341143, 3647241, H03M 166

Patent

active

054899036

ABSTRACT:
A method and apparatus for digital to analog conversion using sigma-delta modulation of the temporal spacing between digital samples. The method and apparatus of the present invention provides for sigma-delta modulation of the time base such that errors produced by non-uniform sampling are frequency-shaped to a region (i.e., shifted to higher frequencies) where they can be removed by conventional filtering techniques. In one embodiment, the digital data is interpolated by a fixed ratio and then decimated under control of a sigma-delta modulated frequency selection signal that represents, on average, the data rate of the incoming digital data stream. The frequency signal selection number is modulated using an n-th order m-bit sigma-delta modulator. Data thus emerges from the interpolation/decimation process at the clock rate of the n-th order m-bit sigma-delta modulator. The method and apparatus converts the data rate of the incoming digital data stream to the data rate of the n-th order m-bit sigma-delta modulator.

REFERENCES:
patent: 4179670 (1979-12-01), Kingsbury
patent: 4281318 (1981-07-01), Candy et al.
patent: 4797845 (1989-01-01), Stikvoort
patent: 4953117 (1990-08-01), Lagadec
patent: 4954824 (1990-09-01), Yamada et al.
patent: 4987373 (1991-01-01), Soo
patent: 4990911 (1991-02-01), Fujita et al.
patent: 5075679 (1991-12-01), Gazsi
patent: 5111417 (1992-05-01), Belloc et al.
patent: 5119093 (1992-06-01), Vogt et al.
patent: 5121065 (1992-06-01), Wagner
patent: 5157395 (1992-10-01), Del Signore et al.
patent: 5204827 (1993-04-01), Fujita et al.
patent: 5227787 (1993-07-01), Kurashina
patent: 5313205 (1994-05-01), Wilson
patent: 5353026 (1994-10-01), Wilson
J. Janssen, et al. A New Principle/IC for Audio Sampling Rate Conversion, presented at the 96th convention, Feb. 26, 1994-Mar. 1, 1994.
Richard J. Higgins, Digital Signal Processing in VLSI, Prentice Hall, Englewood Cliffs, N.J. 07632, 1990, pp. 29-31.
Douglas F. Elliott, et al, Fast Transforms, Algorithms, Analyses, Applications, 1982, Academic Press, p. 13.
Electronique, No. 24, Jan. 1993, Paris, France, pp. 42-44, Trazeguet, H., "Les Can Delta-Sigma Deviennent Programmables".
Patent Abstracts of Japan, vol. 003, No. 018 (E-091) Feb. 16, 1979 & JP-A-53147409 (Fujitsu Ltd.) Dec. 22, 1978.

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