A new SoC video ghost canceller

Jiaoying Huang*, Yigang He, Yichuang Sun, Wenshan Zhao, Xi Zhu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

A video ghost canceller, which reduces the effect of multi-path signal echoes (ghosts), is described in this paper. An adaptive LMS algorithm was used to improve the received image quality of PAL or NTSC broadcasts. The internal 576-tap digital filter, which is comprised of a 144-tap FIR and a 430-tap IIR filter, cancels ghosts occurring from -6.15μS before to +41.6μS after the main signal. In order to reduce the chip area occupied by the filter, an algorithm that combines the error threshold and the error accumulation methods is applied for reducing the coefficients word-length. Also, a tap-decimated equalizer is proposed, which can greatly reduce the number of the multipliers in the adaptive filter. The system on chip (SoC) device performs all the functions required for ghost cancellation, eliminating the need for external DSP controllers, memory, sync detection, D/A converters, A/D converters, and user programming. From chip tests, the canceller can remove the ghost whose power is lower than -6dB compared to that of the main signal and make ghost residue down to -40 dB. When operating at a rate of 14.318 MHz (4Fsc), it dissipates 1.3W from a 3.3V power supply.

Original languageEnglish
Title of host publication52nd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS '09
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1143-1146
Number of pages4
ISBN (Electronic)9781424444809
ISBN (Print)9781424444793
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event2009 52nd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS '09 - Cancun, Mexico
Duration: 2 Aug 20095 Aug 2009

Other

Other2009 52nd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS '09
CountryMexico
CityCancun
Period2/08/095/08/09

Keywords

  • Adaptive LMS algorithm
  • Digital filter
  • DSP
  • Ghost canceller

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