AM compatible digital waveform frame timing recovery and frame s

Details AM compatible digital waveform frame timing recovery and frame s AM compatible digital waveform frame timing recovery and frame s

1996-04-22

1998-06-09

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375355, 370203, 370206, H04L 2714

Patent

active

057647062

ABSTRACT:
In a broadcast system having a complex waveform of digital and analog segments, frame timing is recovered and the frame synchronous power of the digital portion of the composite AM compatible Digital Audio Broadcast (DAB) waveform is measured by examining a portion of the signal. The frame timing necessary for proper demodulation is recovered from the received signal, and a signal power measurement for scaling is provided. 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.

REFERENCES:
patent: 5282222 (1994-01-01), Fattouche et al.
patent: 5406551 (1995-04-01), Saito et al.
patent: 5444697 (1995-08-01), Leung et al.
patent: 5471464 (1995-11-01), Ikeda
patent: 5588022 (1996-12-01), Dapper et al.

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