Title :
Multi-path equalization for NTSC video by using digital IIR filter
Author :
Chao, Tzy-Hong S.
Author_Institution :
David Sarnoff Res. Center, Princeton, NJ, USA
fDate :
2/1/1988 12:00:00 AM
Abstract :
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
Keywords :
digital filters; television broadcasting; television interference; television reception; video signals; IIR deghosting filter; NTSC video; TV broadcasting; TV interference; TV reception; analog channel; analog linear system; channel parameters; complex weighted impulses; crossbar network; digital FIR approximation; digital IIR filter; ghost interferences; ghosted sync; minimum mean square error criterion; multipath channel; multipath equalisation; radio-frequency-to-baseband conversion; random noise; relative delays; stability; sync waveform; Delay; Digital filters; Finite impulse response filter; IIR filters; Interference; Linear systems; Mean square error methods; Multipath channels; Radio frequency; Sufficient conditions;
Journal_Title :
Consumer Electronics, IEEE Transactions on
