Method and circuit arrangement for improving the resolution of t

Details Method and circuit arrangement for improving the resolution of t Method and circuit arrangement for improving the resolution of t

1988-08-23

1990-05-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358 37, 358 13, H04N 712

Patent

active

049243098

ABSTRACT:
A method and apparatus for the improvement of the resolution of digital signals. In digital TV signals which are transformed into a frequency domain, irregularities in the pattern of the reproduced video signals occur because of rounding off errors, when the number of bits per sample is reduced during calculation of the coefficients. This is remedied by increasing the coefficients of the transformed signal values following at least one first coefficient, for example a DC-coefficient, and reducing them again after inverse transformation. This is applicable to digital systems using block processing in which, because of a limited amount of bits, a rounding off of the transmitted spectral coefficients is performed in the calculation.

REFERENCES:
patent: 4654695 (1987-03-01), Fling
patent: 4698689 (1987-10-01), Tzou
patent: 4707738 (1987-11-01), Ferre et al.
"Coding of Video Signals"; Bostemann et al.; Elektrisches Nachrichtenwesen; vol. 59, No. 3; 1985; pp. 286-294.

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