Apparatus and methods for non-linear processing of digital signa

Details Apparatus and methods for non-linear processing of digital signa Apparatus and methods for non-linear processing of digital signa

1991-07-10

1993-08-10

Oberley, Alvin E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 32, H04N 1104

Patent

active

052354105

ABSTRACT:
A digital signal is non-linearly processed without generation of alias components by modelling the required non-linear operation by the best available quadratic function. A transformation circuit for implementing the quadratic function ax.sup.2 +bx may be used. As a result, only the second harmonic of each original frequency component of the digital signal is generated. Space for accommodating the original frequency components and the second harmonics can be made either by sampling frequency up-conversion in an interpolation up-converting circuit which doubles the sampling frequency, or by bandlimiting the original digital signal to a quarter of the original sampling frequency. In either case, the second harmonics occur below the Nyquist limit and no alias components are generated. A video signal color corrector makes use of both of the above techniques.

REFERENCES:
patent: 4322739 (1982-03-01), Drewery et al.
patent: 4520386 (1985-05-01), Asaida

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