A new SoC video ghost canceller

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.

[1]  Karsten P. Ulland,et al.  Vii. References , 2022 .

[2]  R. Hill,et al.  Low Cost Stand-Alone Ghost Cancellation System , 1994, IEEE International Conference on Consumer Electronics.

[3]  W. Pora,et al.  A TV ghost canceller using FPGA-based FIR filters , 2002, Asia-Pacific Conference on Circuits and Systems.

[4]  Sung Bum Pan,et al.  Hardware architectures of adaptive equalizers for the HDTV receiver , 1998, IEEE Trans. Signal Process..

[5]  W. Sansen,et al.  A 10-bit 1-GSample/s Nyquist current-steering CMOS D/A converter , 2001, Proceedings of the IEEE 2000 Custom Integrated Circuits Conference (Cat. No.00CH37044).

[6]  Alan N. Willson,et al.  A programmable FIR filter for TV ghost cancellation , 1996, Proceedings of the 39th Midwest Symposium on Circuits and Systems.

[7]  Wonyong Sung,et al.  VLSI implementation of an adaptive equalizer for ATSC digital TV receivers , 2003, 2003 IEEE Workshop on Signal Processing Systems (IEEE Cat. No.03TH8682).

[8]  Neil Weste,et al.  A Single Chip Video Ghost Canceller , 1992, 1992 Proceedings of the IEEE Custom Integrated Circuits Conference.

[9]  Yichuang Sun,et al.  A 10-bit 200-MHz CMOS video DAC for HDTV applications , 2007 .

[10]  M.S.J. Steyaert,et al.  A 10-bit 250-MS/s binary-weighted current-steering DAC , 2004, IEEE Journal of Solid-State Circuits.

[11]  M. A. Alturaigi.  VLSI array to speed up the computation of TV ghost canceler parameters , 1996 .

[12]  Tadashi Nagamine,et al.  A digital-processing IC for ghost canceler , 1992 .