Recursive noise-reducer

Details Recursive noise-reducer Recursive noise-reducer

1989-03-13

1990-09-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 521

Patent

active

049548948

ABSTRACT:
A recursive noise-reducer for a high-definition TV system includes an interpolation device for performing two-frame interframe interpolation on the input digital signal. A delay device delays the input digital signal by one frame period and two frame period. An output signal from the delay device is separated into a one-frame-preceding signal component and a two-frame-preceding signal component. A first subtracter derives a difference between the input digital signal and the one-frame-preceding signal component. A filter filters an output signal from the first subtracter and passes a signal component having a recursion with a period corresponding to one frame. A second subtracter derives a difference between the input digital signal and the two-frame-preceding signal component. An adder adds the input digital signal, an output signal from the filter, and an output signal from the second subtracter. The interpolation device operates to alternately select an output signal from the adder and the one-frame-preceding signal component and to thereby generate the interpolated signal from which noise components are effectively reduced.

REFERENCES:
patent: 4500911 (1985-02-01), Ninomiya et al.
patent: 4539594 (1985-09-01), Illetschko
patent: 4796088 (1989-01-01), Nishimura et al.
patent: 4807034 (1989-02-01), Takeuchi et al.
patent: 4860104 (1989-08-01), Katsuyama
patent: 4876734 (1989-10-01), Kawamura
patent: 4888642 (1989-12-01), Kato

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