Digital carrier-recovery scheme for FM stereo detection

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation

Reexamination Certificate

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C455S337000, C381S002000

Reexamination Certificate

active

07826812

ABSTRACT:
Systems and techniques for digital processing of FM signals include, in at least one aspect, an FM digital processing method including receiving one or more digital signals including a first signal having a first frequency; obtaining a second signal by multiplying the first signal by X to assist in information recovery from the one or more digital signals based on the first signal; filtering the second signal to obtain a high frequency component of the second signal; delaying the second signal to obtain a delayed signal; and generating an output signal based on the high frequency component of the second signal and a normalization factor derived at least in part from the delayed signal.

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Faller et al., “Technical Advances in Digital Audio Radio Broadcasting”, Proceedings of the IEEE, vol. 90, No. 8, Aug. 2002.
Recommendation ITU-R BS. 450-3, “Transmission Standards for FM Sound Broadcasting at VHF”, (1982-1995-2001), The ITU Radiocommunication Assembly.

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