Digital FM detector for a digital signal

Details Digital FM detector for a digital signal Digital FM detector for a digital signal

1985-05-06

1987-01-06

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 329137, 329145, H03D 300

Patent

active

046349898

ABSTRACT:
A digital signal derived from an analog signal by means of an analog-to-digital converter clocked by a clock signal is fed to a first delay element and a 90.degree. phase shifter at the same time. The delayed digital signal is applied through a second delay element to one input of a first multiplier and directly to the other input of this multiplier. In similar fashion, the signal at the output of the 90.degree. phase shifter is applied directly to one input of a second multiplier and through a third delay element to the other input of this multiplier. The output signals of the multipliers are combined in an adder to provide the demodulated digital signal. In accordance with the invention, multiple multiplications and a signal mixture to form the Hilbert-transformed signal, which are necessary in the known prior art, can be avoided.

REFERENCES:
patent: 4416016 (1983-11-01), Iapicco
patent: 4549143 (1985-10-01), Bouland et al.
Patent Abstracts of Japan, Band 6, No. 132, Jul. 17, 1982.
Electronics Letters, Band 15, No. 16, Aug. 2, 1979, "Digital Frequency Discriminator", pp. 489-490.

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