Digital audio broadcasting system

Details Digital audio broadcasting system Digital audio broadcasting system

1990-04-12

1993-01-12

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

381 31, 455 42, H04L 2700

Patent

active

051795760

ABSTRACT:
Broadcasting system digitizes audio input signals before RF modulating and transmitting over airwaves to one or more remote receiving stations. Receiving station recovers the digitized signal by demodulating and exponentially expanding the received RF signal. Recovered digital signal is subsequently frequency modulated and sent, via an electrically conductive cable, to an FM radio, over which the original audio input signals are faithfully reproduced. A time switch in series with the RF receiver and the FM modulator is capable of temporarily disabling modulated transmissions to radio through the electrically conductive cable. Relay stations, (either land-based or satellite), allow for transmission beyond the range (i.e. "line-of-sight") of common FM radio transmissions.

REFERENCES:
patent: 1715415 (1929-06-01), Hanson et al.
patent: 4517669 (1985-05-01), Freeburg
patent: 4696051 (1987-09-01), Breeden
patent: 4922537 (1990-05-01), Frederiksen

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