Wide dynamic range digital to analog conversion method and syste

Details Wide dynamic range digital to analog conversion method and syste Wide dynamic range digital to analog conversion method and syste

1988-08-12

1989-07-04

Roskoski, Bernard

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341141, 341122, 341144, H03M 120

Patent

active

048454982

ABSTRACT:
A method and apparatus well suited for the conversion of a digitized audio signal into analog form with as wide a dynamic range as possible. A digital dither signal is added to a digital audio or like data signal to provide a digital data/dither signal. This digital data/dither signal and the digital dither signal are both converted into an analog data/dither signal and an analog dither signal respectively, and the analog dither signal is subtracted from the analog data/dither signal to obtain an analog data signal equivalent to the digital data signal. The level of the incoming digital data signal may be so high that when the digital dither signal is added thereto, the total level of the data/dither signal may exceed the capacity of the digital to analog converter in use. In that case the digital dither signal is either gated off or reduced in level, with the result that the digital to analog converter inputs either the data signal only or the data/dither signal having a total level not exceeding its capacity.

REFERENCES:
patent: 3562420 (1971-02-01), Thompson
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. III-1 to III-9; III-50 & III-51.
"The Application of Large Amplitude Dither to the Quantization of Wide Range Audio Signals", Yoshio Yamasaki, The Journal of the Acoustical Society of Japan, vol. 39, No. 7, 1983.

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