Digital circuit for the introduction and later removal of dither

Details Digital circuit for the introduction and later removal of dither Digital circuit for the introduction and later removal of dither

1993-01-15

1994-05-10

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341110, H03M 120

Patent

active

053111800

ABSTRACT:
An electronics circuit for accurately digitizing an analog audio or like data signal into a digital equivalent signal by introducing dither into the analog signal and then subsequently removing the dither from the digitized signal prior to its conversion to an analog signal which is a substantial replica of the incoming analog audio or like data signal. The electronics circuit of the present invention is characterized by a first pseudo-random number generator which generates digital random noise signals or dither for addition to the digital equivalent signal and a second pseudo-random number generator which generates subtractive digital random noise signals for the subsequent removal of dither from the digital equivalent signal prior its conversion to the analog replica signal.

REFERENCES:
patent: 4700173 (1987-10-01), Araki et al.
patent: 4812846 (1989-03-01), Noro
patent: 4914439 (1990-03-01), Nakahashi et al.
patent: 4965668 (1990-10-01), Abt et al.
patent: 4994803 (1991-02-01), Blackham
patent: 5187481 (1993-02-01), Hiller
Robert Alexander Wannamaker, Dither & Noise Shaping in Audio Application, 91.

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