Digital delay filter

Details Digital delay filter Digital delay filter

H - Electricity

03

H

328/0.3

H03H 17/00 (2006.01) H03H 17/06 (2006.01) H04N 5/14 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1249640

Abstract of the Disclosure A digital input signal to be delayed is applied to a two-point linear interpolation filter which imparts delay to the signal proportional to the value of a delay control signal. Errors in both the amplitude and the phase of the delayed signal are minimized by the addition of a correction signal to the delayed signal. The correction signal is provided by applying the input signal to a further filter and a multiplier connected in cascade. The further filter is a linear phase filter having a response zero at zero frequency and a delay equal to an odd multiple of one-half of the sampling period, Ts, of the digital input signal. The multiplier is controlled so as to vary the amplitude of the compensating signal as a non-linear function of the delay control signal so as to provide maximum amplitude compensation at delays corresponding to odd multiples of Ts/2 and zero amplitude compensation at delays equal to integer multiples of Ts.

496876

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