Pulse or digital communications – Apparatus convertible to analog
Patent
1997-02-21
2000-10-03
Chin, Stephen
Pulse or digital communications
Apparatus convertible to analog
375260, 375261, 375268, 375298, 370265, 370267, 370493, H04L 2500, H04L 2700
Patent
active
061283347
ABSTRACT:
The present invention provides for a receiver addressable AM compatible digital broadcast system and method. The digital broadcast signal includes a plurality of digitally modulated signals and an analog signal. A transmitter useable within the system includes a data combiner for generating an aggregate digital data signal, and a waveform generator for forming the digital broadcast signal. A receiver useable within the system comprises a waveform detector for separating the signals and a data parser for separating the digitally modulated signals. The present invention further provides for a method of selectively transmitting data via a digital broadcast signal. The method includes forming the digital broadcast signal from an analog signal and a plurality of digitally modulated signals, transmitting and receiving the digital broadcast signal. The method further includes the steps of separating the analog signal from the digitally modulated signals, separating the digitally modulated signals, comparing a destination identification signal with an identification code, and passing a user defined message signal responsive to the destination identification digital signal corresponding to the identification code.
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Carlin Barry W.
Dapper Mark J.
Geile Michael J.
Chin Stephen
Lenart Robert P.
Maddox Michael W.
USA Digital Radio, Inc.
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