Random number dither circuit for digital-to-analog output signal

Details Random number dither circuit for digital-to-analog output signal Random number dither circuit for digital-to-analog output signal

1989-11-27

1991-02-19

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341140, 341144, H03M 120

Patent

active

049948032

ABSTRACT:
Distortion in a digital-to-analog converter (DAC) is eliminated by adding a digital random number to each sample of the digital signal, converting the sum into analog form, and subtracting from this analog sum the analog counterpart of the digital random number. The result is the analog counterpart to the input digital signal. The conversation of the summed digital signal and the random number into analog form can be performed by two conventional DACs. For any digital input sample, the output of each DAC is equally likely to contain any of the possible distortion errors produced by the DAC. (An exception is the most significant output bit of the DAC that processes the summed signal, an exception that may be handled by stripping off the most significant bit and applying it to a one-bit DAC.) The error signal at the output of each of the two DACs is thus a random sequence (i.e. noise) of DAC distortion errors. The time average of this noise signal is a small offset error which, if desired, can be removed by subsequent processing stages.

REFERENCES:
patent: 4550309 (1985-10-01), Hiller et al.
Yamasaki; The Application of Large Amplitude Dither to the Quantization of Wide Range Audio Signals; Journal of the Acoustical Society of Japan; vol. 39, No. 7 Jul. 1983, pp. 452-462.

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