Apparatus including amplitude limiter and associated method for generating a modified video signal

摘要

An apparatus and method for generating a modified video signal consisting of a correction signal and a video input signal. The correction signal is derived from a digitized video input signal by at least a frequency-band limiter and an amplitude limiter. The video input signal is delayed by the processing time of the correction signal before the two signals are combined. To avoid unwanted harmonics the amplitude limiter uses a transfer function which can be exactly described by a rational integral function of the nth degree, y=a0+a1*x+a2*x2+a3*x3 . . . an*xn with 1<n<fn/fs, where fn is the Nyquist frequency, fs is the maximum frequency of the frequency-band-limited video signal, x is the input to the amplitude limiter a0 to an are scale factors, and y is the output of the amplitude limiter.