Digital filters and demodulators

Details Digital filters and demodulators Digital filters and demodulators

H - Electricity

04

L

329/3, 328/0.3

H04L 7/02 (2006.01)

Patent

CA 1277723

ABSTRACT Digital representations of a signal are stored in a store (8) e.g. in the order of their occurrence. Multipliers (9) sultiply the samples by coefficients (C1 to C36) representing a function with which the samples are to be convolved. The signal is subject to variable time delays. To compensate for the variable time delays sets of coefficients are stored, the sets representing the function with different time delays. The set to be convolved with the signal is chosen in dependence upon the time delay of the signal. A signal indicative of the time delay is derived from an input to the shift register and fed-forward. The filter is preferably used in a digital demodulator of phase and/or amplitude modulated signals.

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