Multi-path equalization for NTSC video by using digital IIR filter
T.-H.S. Chao · IEEE Transactions on Consumer Electronics · 1988
The multipath channel is modeled as an analog linear system with a response of complex weighted impulses of various relative delays. The effect of radio-frequency-to-baseband conversion is included. The minimum mean square error criterion is used to find a digital FIR approximation of the analog channel. The digital IIR equalization filter is selected to be the inverse of the FIR approximation; it can minimize ghost interferences with minor sacrifice of the random noise part. A simple sufficient condition for stability of the IIR deghosting filter is presented. A configurable IIR filter architecture using a crossbar network is described. A priori knowledge of the sync waveform is applied to synthesize a ghosted sync as a function of the channel parameters.>