Waveform response improvement circuit

Details Waveform response improvement circuit Waveform response improvement circuit

1994-12-09

1996-09-24

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

H04N 5208

Patent

active

055595634

ABSTRACT:
A waveform response improvement circuit including first to fourth delay circuits for sequentially delaying an input signal by respective predetermined delay times, circuits for obtaining an inverted signal of a signal indicative of increase/decrease of the vicinity of an output signal of the second delay circuit, a first amplitude adjust circuit for adjusting the amplitude of the signal, a maximum value selection circuit and a minimum value selection circuit for selecting the maximum and minimum values from output signals of the delay circuits, third and fourth subtracting circuits for respectively subtracting the output signal of the second delay circuit from the maximum value and minimum value signals, an intermediate value selection circuit for selecting the intermediate value from output signals of the amplitude adjust circuit, and the third and fourth subtracting circuits, second amplitude adjust circuit for adjusting the amplitude of the output signal, and a second adding circuit for adding an output signal of the amplitude adjust circuit and that of the second delay circuit. The circuit is prevented from erroneously operating even when an input signal has a small amplitude and decoloration is prevented from occurring even when an input signal has a small area.

REFERENCES:
patent: 5151787 (1992-09-01), Park
patent: 5404180 (1995-04-01), Kitano et al.

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