A TV ghost canceller using FPGA-based FIR filters

This paper presents a PAL TV ghost canceller that employs a ghost cancellation reference signal (GCR signal) recommended in an ITU standard. The LMS algorithm is chosen to find the channel inverse, which is estimated by a 256-tap FIR filter. The emphasis is upon a resource sharing technique, which increases utilization of the multipliers by eight times. To test the canceller, a TV ghost emulator is constructed. From subjective tests, the canceller can remove the ghost whose power is lower than -6 dB compared to that of the main signal, providing its delay is lower than 10 μs.