Adaptive digital filter

Details Adaptive digital filter Adaptive digital filter

1985-10-31

1988-01-05

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, 364724, H04N 5262

Patent

active

047179511

ABSTRACT:
A picture-in-picture television receiver for which the viewer may change the size of the inset image includes an adaptive anti-aliasing filter. Composite video signals which produce the inset image are applied to a separation filter which attenuates the chrominance components to provide separated luminance signals. The luminance signals are applied to a second filter which includes a variable delay element and an adder. The luminance signals are applied to one input port of the adder and to the delay element. The signals provided by the delay element are applied to the second input port of the adder. The delay element provides time delays which may be expressed by the equation T=K.sub.2 .tau.+PK.sub.1 .tau. where .tau. is a fixed amount of time, K.sub.1 and K.sub.2 are constants and P is a variable. The frequency response characteristic of the filter is changed by changing the value of P.

REFERENCES:
patent: 4218705 (1980-08-01), Inaba et al.
patent: 4282546 (1981-08-01), Reitmeier
patent: 4298891 (1981-11-01), Baba et al.
patent: 4352162 (1982-09-01), Nyuji et al.
patent: 4488251 (1984-12-01), Wischermann
patent: 4602285 (1986-07-01), Beaulier et al.
L. R. Rabiner et al., Digital Processing of Speech Signals, Prentice-Hall, Inc., Englewood Cliffs, N.J., 1978, pp. 10-31.

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