Am compatible digital waveform frame timing recovery and...

Details Am compatible digital waveform frame timing recovery and... Am compatible digital waveform frame timing recovery and...

H - Electricity

04

L

H04L 7/00 (2006.01) H04J 11/00 (2006.01) H04L 5/02 (2006.01) H04L 27/22 (2006.01) H04L 27/26 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2236214

In a broadcast system having a complex waveform of digital and analog segments, frame timing is recovered (290) and the frame synchronous power (284) of the digital portion of the composite AM compatible Digital Audio Broadcast (DAB) waveform is measured by examining a portion of the signal (284). The frame timing necessary for proper demodulation is recovered from the received signal (200), and a signal power measurement for scaling (242) is provided (294). The composite AM compatible DAB waveform is produced by a modulation method in which a digital representation of an audio signal is encoded together with an analog amplitude modulated (AM) signal and transmitted simultaneously in the same frequency channel.

Dans un système de radiodifusion utilisant une forme d'onde complexe constituée d'un segment numérique et d'un segment analogique, on récupère (290) le rythme des trames et on mesure (284) la puissance synchrone des trames de la portion numérique de la forme d'onde composite (DAB), par l'examen d'une portion du signal (284). Le rythme des trames nécessaire à une démodulation correcte est récupéré du signal reçu (200), et une mesure de la puissance du signal pour mise à l'échelle (242) est obtenue (294). La forme d'onde audio composite DAB est obtenue par un procédé de modulation dans lequel une représentation numérique d'un signal audio est codée avec un signal analogique modulé en amplitude, pour une transmission simultanée par le même canal de fréquence.

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