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

Volume

34

Issue

1

fYear

1988

fDate

2/1/1988 12:00:00 AM

Firstpage

268

Lastpage

278

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;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.75378

Filename

75378