Digital to analog conversion circuit with dither and overflow pr

Details Digital to analog conversion circuit with dither and overflow pr Digital to analog conversion circuit with dither and overflow pr

1991-09-25

1992-09-15

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341144, H03M 120

Patent

active

051481634

ABSTRACT:
In a digital-to-analog conversion system, an input digital signal D is separated by means of an inverter into first and second signal paths, one of which is the inverse of the other. A digital random noise signal R is then added to the direct and inverse signals to form combined digital signals R-D, R+D. The combined signals are converted into analog form by two identical D/A converter devices to provide analog signals R-D+E1, R+D+E2 (E1 and E2 representing the errors introduced in the conversion process), and these are then subtracted to form an analog output 2D-E1+E2. Thus the random noise components are removed from the analog output, and also the errors E1 and E2 tend to cancel each other leading to a reduction in distortion. Moreover, any remaining distortion is randomized and thus harmonic distortion is reduced. When the injected random noise signal has a greater resolution than the converter devices, there is also an overall increase in data resolution.
A similar technique may also be applied to analog-to-digital conversion systems.

REFERENCES:
patent: 4864305 (1989-09-01), Toyama
patent: 4914439 (1990-04-01), Nakahashi et al.
patent: 4926179 (1990-05-01), Yoshioka
patent: 4968987 (1990-11-01), Naka et al.
Yamasaki, The Application of Large Amplitude Dither to the Quantization of Wide Range Audio Signals, The Journal of the Acoustical Society of Japan, 1983, vol. 39, #7, pp. 452-462.

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