Ghost signal cancellation system for television signals

Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction

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348614, H04N 5213

Patent

active

053862430

ABSTRACT:
A ghost cancellation system for filtering out ghosts in a received video signal including an active filter having a filtering function defined by a first set of coefficients (ak.sub.old) and having a input and a output. A transmitted ghost cancellation reference (GCR) signal is applied to the input of the active filter during a vertical blanking period to generate a filtered GCR signal at the output of the active filter. The filtered GCR signal is compared with a ghostless GCR signal to obtain an error signal, and the filter coefficients are adjusted based on the error signal to obtain a set of new coefficients (ak.sub.new). The active filter includes a feedforward FIR filter and an adder serially connected between the input and the output, a feedback IIR filter and a switch serially connected between the output and-the adder, the feedforward FIR filter and the feedback IIR filter having filtering functions defined by the coefficients. The active filter is reconfigurable as a matched filter by passing the error signal serially through the feedforward FIR filter and the feedback IIR filter, the matched filter receiving the error signal and producing a set of impulses (dk) which represent received ghost delays and coefficients where ##EQU1## where x(j) is time-reversed sequence of the coefficients in the bank (ideal GCR sequence), and e(j+k) is the difference between the received average GCR and the reference GCR.

REFERENCES:
patent: 5053870 (1991-10-01), Ho et al.

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