Sharpness enhanced equal bandwidth luminance bandwidth compressi

Details Sharpness enhanced equal bandwidth luminance bandwidth compressi Sharpness enhanced equal bandwidth luminance bandwidth compressi

1985-02-01

1987-02-24

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 358 38, 358186, H04N 514, H04N 538

Patent

active

046461523

ABSTRACT:
Circuitry for enhancing the sharpness of bandwidth compressed television signals provides equalization in only the transmitter with no equalization required in the receiver. The transmitter includes a linear phase delay and edge peaking circuit, a low pass filter and an equalization circuit. The linear phase delay and edge peaking circuit includes a tapped delay line which provides weighted output signals for differential phase delays. The weighted output signals of the tapped delay line are differentially combined to provide a combined output signal. This combined output signal and a signal from the tapped delay line are supplied to a peaking circuit. A clamping circuit is connected to limit the amplitude of high level signals in the combined output signal so that small transitions are peaked to a greater degree than large transitions.

REFERENCES:
patent: 4074308 (1978-02-01), Gibson
patent: 4376952 (1983-03-01), Troiano
patent: 4402006 (1983-08-01), Karlock
patent: 4403255 (1983-09-01), Schiff

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