Method and apparatus for bias suppression in a VCO based FM tran

Details Method and apparatus for bias suppression in a VCO based FM tran Method and apparatus for bias suppression in a VCO based FM tran

1994-10-31

1997-07-01

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

375292, 341 58, H04L 2704, H04L 2549

Patent

active

056446012

ABSTRACT:
A method and apparatus for bias suppression which includes a transmitter having a bias suppression encoder and a closed-loop VCO FM modulator and a receiver having a bias suppression decoder and an AC coupled FM demodulator. The bias suppression encoder generates a running sum of an encoded digital data signal as well as the sum of an (N+1)-bit block of an injected digital data signal such that the encoder may invert a block of (N+1)-bits of the injected data signal if both sums are of the same polarity thereby reducing the average DC bias of the encoded digital data signal. The encoded data signal is modulated using a closed-loop VCO FM modulator with the DC tracking effect minimized as compared to modulating the non-encoded signal directly.

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