DocumentCode :
862863
Title :
Synchronization of analog video signals with improved image stability
Author :
Rothermel, Albrecht ; Lares, Roland
Author_Institution :
Dept. of Microelectronics, Ulm Univ., Germany
Volume :
49
Issue :
4
fYear :
2003
Firstpage :
1292
Lastpage :
1300
Abstract :
Sync digital multimedia devices today feature analog composite or S-video inputs for compatibility reasons. We expect that interface to be included for the medium term future, since analog VCRs still make up a significant part of today´s purchased home recording devices. Nowadays, sync processing is done mainly digital, however based on the traditional techniques of sync slicing and smoothing using a PLL (phase-locked loop). Due to its recursive nature, the PLL is limited to a second order loop, which limits its filter performance. Limited filter performance results in the well known picture stability compromise, where noise suppression has to be compromised with VCR-playback picture stability. We introduced a concept which replaces the PLL by non-recursive processing. Removing the stability issues of recursive processing opens a large parameter range for filter design and optimization. In this paper, we give a discussion of the parameter optimization effects and results, which includes subjective quality tests. The research was greatly supported by a real-time implementation of the novel algorithm using an industry standard FPGA.
Keywords :
FIR filters; matched filters; optimisation; phase locked loops; smoothing methods; stability; synchronisation; video signal processing; video tape recorders; FIR filter; FPGA; analog video signals; field programmable gate array; filter performance; finite impulse response; free-running clock; image stability; line frequency filter; matched filter; noise suppression; nonrecursive processing; parameter optimization; phase-locked loop; second order loop; smoothing; sync filter design; sync slicing; synchronization; time-base correction; transversal filtering; Circuit noise; Data mining; Finite impulse response filter; Frequency synchronization; Matched filters; Multimedia systems; Phase locked loops; Stability; TV; Timing;
fLanguage :
English
Journal_Title :
Consumer Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0098-3063
Type :
jour
DOI :
10.1109/TCE.2003.1261232
Filename :
1261232
Link To Document :
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