Method and apparatus for processing data signals in high quality

Details Method and apparatus for processing data signals in high quality Method and apparatus for processing data signals in high quality

1993-12-16

1997-01-07

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

Byte length changed

341 94, H03M 700

Patent

active

055921612

ABSTRACT:
A data signal processing method and apparatus capable of obtaining a high quality signal performs the following operation. M bits of code information are separated into upper N bits and lower (M-N) bits wherein M>N. A change mode of the upper N bits is detected using a first resolution wherein values are represented in units of 1/2.sup.N of the predetermined dynamic range of the signal. A change mode of the lower (M-N) bits is detected using a second resolution wherein values are represented in units of 1/2.sup.M of the predetermined dynamic range. Correction code data is generated at the time when an accumulated value of the lower (M-N) bits reaches the value associated with 1 LSB in the first resolution. The accumulated value is obtained for adding sequential sampling values using the second resolution in each period. The periods are set on the basis of the change mode in a signal processing interval within sequential local maximum to local minimum values or temporally within sequential local minimum to local minimum values, with a local maximum value occurring therebetween. The correction code data for changing the temporal position of the correction code data is added to the N bits represented code data in order to obtain a signal waveform near the signals of the M-bit code data.

REFERENCES:
patent: 3761697 (1973-09-01), Stanley et al.
patent: 4829584 (1989-05-01), Shimano
patent: 5008669 (1991-04-01), Ishibashi et al.
patent: 5283577 (1994-02-01), Coenen

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