Digital FSK demodulator using non-recursive transversal filter

Details Digital FSK demodulator using non-recursive transversal filter Digital FSK demodulator using non-recursive transversal filter

1982-05-18

1985-08-06

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 329110, 364724, 375 88, 375 94, H03D 300, H03K 906, G06F 7544

Patent

active

045338744

ABSTRACT:
Method for demodulating FSK signals in which zero crossings of the FSK signals are detected and processed further. A FSK demodulator including an address-generating logic and a memory connected to the address-generating logic. The FSK signals are delivered to the input side of and control the address-generating logic. At a system clock frequency, the necessary address sequence is supplied to the memory for reading out a pulse reply from the memory for each zero-crossing of the FSK signal. In the memory are stored time-sequential values of a pulse reply having a given duration which emulate the output of a digital non-recursive transversal filter having lowpass transfer characteristic upon an input pulse of given duration. The address generating logic supplies a definite counting address to each zero crossing on the input side which is not yet assigned to another zero crossing. The counting address sequentially assumes all sequence values for the given duration which are necessary for reading out the pulse reply from the memory and which last sequence value assumes a rest value after the completion of the read out process. Data read out from the memory during a given system clock period is summed up.

REFERENCES:
patent: 4423488 (1983-12-01), Campbell
patent: 4484299 (1984-11-01), Lambourn et al.
Doctoral Thesis by G. Roupp, "The Demodulation of Frequency Shift-Keyed Signals with Band Widths in the Order of the Center Frequency", University of Stuttgart, 1975, pp. 35 through 39 and pp. 123 through 125.

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