Fsk discriminator

Details Fsk discriminator Fsk discriminator

H - Electricity

03

D

329/11

H03D 3/00 (2006.01) H04L 27/152 (2006.01)

Patent

CA 1336445

The outputs of two filter channels for accepting two keying frequencies are compared to produce the output. Each channel uses finite impulse response transversal filters; preferably with an impulse response of duration comparable with the symbol period of the incoming signal. Each channel has a pair of filters for accepting phase quadrature components (or, alternatively, quadrature synchronous demodulators followed by filters): the filter coefficients differ from sinusoidal by (or, in the alternative case, are formed by) a modification function which is the same for both filters of the pair.

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