Apparatus for demodulating a digital FM signal which normally ha

Details Apparatus for demodulating a digital FM signal which normally ha Apparatus for demodulating a digital FM signal which normally ha

1996-06-19

1999-05-25

Neyzari, Ali

Dynamic information storage or retrieval

Signal processing by storage and subsequent retrieval

369 59, 329313, H04M 576

Patent

active

059075287

ABSTRACT:
In a demodulator for a digital FM signal, the received digital FM signal is verified at the data bit boundaries for inversion to detect errors. If an uninverted data bit boundary is detected, those sections of the digital FM signal just preceding and just following the uninverted data bit boundary are modified thereby generating two modified signals. Using the error detecting code included in the digital FM signal, the two modified signals are evaluated to determine which modification corrects the errors and the modified signal with the correct modification is selected.

REFERENCES:
patent: 4540947 (1985-09-01), Fujimoto
patent: 4942565 (1990-07-01), Lagadec

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