Method and apparatus for improving the resolution of digital sig

Details Method and apparatus for improving the resolution of digital sig Method and apparatus for improving the resolution of digital sig

1988-08-15

1989-12-12

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

364725, H04N 7133

Patent

active

048871575

ABSTRACT:
A method and apparatus for the improvement of the resolution of digital signals. In digital TV signals which are transformed into a selected frequency range, irregularities in the pattern of the reproduced video signals occur because of rounding off errors, when the number of places 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 uniform component, and reducing them again before inverse transformation. This invention can be employed in digital systems using block processing in which, because of a limited number of bits, a rounding off of the transmitted spectral coefficients is performed in the calculation.

REFERENCES:
patent: 4704628 (1987-11-01), Chen
patent: 4807042 (1989-02-01), Tanaka

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