Signal processing method and apparatus for transforming N-bit co

Details Signal processing method and apparatus for transforming N-bit co Signal processing method and apparatus for transforming N-bit co

1995-08-15

1997-06-10

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

Byte length changed

341102, 341 88, H03M 720

Patent

active

056380704

ABSTRACT:
N-bit digital signals are transformed into M-bit digital signals (M>N), the N-bit signals being obtained by converting an analog signal into digital signals. Detected are transition points on a time axis and intervals between the transition points at which successive digital signals of the N-bit signals vary. (M-N) bit additional signals are generated which correct errors of the N-bit signals within a range of .+-.0.5 least significant bit of the N-bit signals in response to the transition points and the intervals. The additional signals are delayed so as to correspond to least significant bit of the N-bit signals. The delayed additional signals are combined with the N-bit signals to generate the M-bit signals. Instead of the transition points and intervals, detected are transition patterns of successive digital signals of the N-bit signals over transition points. (M-N) bit additional signals are generated which correct errors of the N-bit signals within a range of .+-.0.5 least significant bit of the N-bit signals based on the transition patterns. The additional signals are combined with the N-bit signals so that the additional signals correspond to the least significant bit of the N-bit signals, to generate the M-bit signals.

REFERENCES:
patent: 4644324 (1987-02-01), Araki et al.
patent: 5323159 (1994-06-01), Imamura et al.
patent: 5448237 (1995-09-01), Borgen et al.

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