Transmission system for digital audio broadcasting

Details Transmission system for digital audio broadcasting Transmission system for digital audio broadcasting

1996-04-04

1998-10-27

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455265, H04B 106

Patent

active

058289542

ABSTRACT:
A digital audio broadcasting (DAB) system includes a radio-frequency (RF) transmitter and a corresponding RF receiver. The RF transmitter transmits an RF DAB signal that includes a pilot signal at 250 Khz. An RF section of the RF receiver includes a phase-lock-loop (PLL) to compensate for any carrier frequency differences in the received RF DAB signal. This PLL tracks the phase of the received RF DAB signal when an amplitude of a recovered IF signal is above a predetermined threshold and upon detection of the pilot signal.

REFERENCES:
patent: 4521918 (1985-06-01), Challen
patent: 4566133 (1986-01-01), Rambo
patent: 4590615 (1986-05-01), Ohtaki et al.
patent: 5249233 (1993-09-01), Kennedy et al.
patent: 5260972 (1993-11-01), Wang
patent: 5406586 (1995-04-01), Wang
patent: 5557640 (1996-09-01), Chadwick
World Media Expo News, "AT&T System Broadcasts Live", by Alan Carter, Sep. 7, 1995.
World Media Expo News, "Reaction in on AT&T DAB Demo", by Alan Carter, Sep. 8, 1995.

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