Waveform shaping method, waveform shaping apparatus and apparatu

Details Waveform shaping method, waveform shaping apparatus and apparatu Waveform shaping method, waveform shaping apparatus and apparatu

1993-03-30

1995-04-04

Britton, Howard W.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348627, 348630, 348631, 348662, 348713, H04N 5208, H04N 968, H04N 977

Patent

active

054041805

ABSTRACT:
A waveform shaping apparatus in which no unrequired waveform shaping operation is performed even if its sensitivity is enhanced is provided. A signal (A) to be shaped in waveform is delayed by delay circuits (1 and 2) to produce signals (B and C). The signals (A, B and C) are applied to an original correction signal generating means (200a) and a control signal generating means (100a) to produce original correction signals (Ka and Kb), and control signals (Ha and Hb), respectively. A control circuit (13) selects the original correction signals (Ka and Kb), or a value "0" in accordance with the control signals (Ha and Hb) to generate a quasi-correction signal (L). The signal (L) is multiplied by a specified coefficient in a coefficient multiplier (14) to produce a correction signal (M), and the correction signal (M) is added to the signal (B) in an adder (5) to obtain an output signal (N) which has been shaped in waveform. The original correction signals and control signals are signals which vary for only a period when the signal (B) varies, and therefore, no unrequited waveform shaping operation is performed for a period when the signal (B) does not vary.

REFERENCES:
patent: 4504853 (1985-03-01), Faroudja
patent: 4758891 (1988-07-01), Hitchcock et al.
patent: 4918528 (1990-04-01), Oohashi
patent: 5070398 (1991-12-01), Suzuki
patent: 5285277 (1994-02-01), Min

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