Digital delay interpolation filter with amplitude and phase comp

Details Digital delay interpolation filter with amplitude and phase comp Digital delay interpolation filter with amplitude and phase comp

1984-12-19

1987-09-15

Harkcom, Gary V.

Boots, shoes, and leggings

364723, G06F 738

Patent

active

046944141

ABSTRACT:
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 add 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.

REFERENCES:
patent: 4263671 (1981-04-01), Chiu et al.
patent: 4302631 (1981-11-01), Shenoi et al.
patent: 4313173 (1982-01-01), Candy et al.
patent: 4400719 (1983-08-01), Powers

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