Digital radio system for rapidly transferring an audio program to a passing vehicle
First Claim
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1. A one-way radio communication system for rapidly transferring an audio program as a digitally encoded burst transmission of up to several seconds'"'"' duration from a fixed geographic point to a moving vehicle as the vehicle passes nearby the point, comprising:
- a very low power radio or TV frequency transmitting unit having means for holding a digitally encoded audio program in a non-volatile digital storage medium, repetitively broadcasting said program at an audio sample data rate substantially higher than real time as a burst transmission of up to several seconds in duration, said transmission also containing appropriate synchronization and program identification signals; and
a radio receiving unit having means for detecting, receiving, and demodulating said burst transmission, means for extracting said transmission'"'"'s digitally encoded audio program and related program identification information, means for identifying the date and time of reception, means for storing one or more said audio programs and said program identification information to a digital storage medium, means for signalling the presence of said audio program to a user, and means for playing any such stored audio program from said digital storage medium via integral D/A circuitry connected to an internal or external speaker system, on demand from a user.
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Abstract
An audio program of up to several minutes duration, together with identifying information, is transferred from a stationary low power radio transmitting unit to a receiving unit in a moving vehicle during a several second digitally encoded burst communication as the vehicle passes by. The receiving unit is capable of capturing, storing, and replaying many such audio programs during the vehicle'"'"'s journey past numerous transmitters,
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Citations
18 Claims
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1. A one-way radio communication system for rapidly transferring an audio program as a digitally encoded burst transmission of up to several seconds'"'"' duration from a fixed geographic point to a moving vehicle as the vehicle passes nearby the point, comprising:
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a very low power radio or TV frequency transmitting unit having means for holding a digitally encoded audio program in a non-volatile digital storage medium, repetitively broadcasting said program at an audio sample data rate substantially higher than real time as a burst transmission of up to several seconds in duration, said transmission also containing appropriate synchronization and program identification signals; and a radio receiving unit having means for detecting, receiving, and demodulating said burst transmission, means for extracting said transmission'"'"'s digitally encoded audio program and related program identification information, means for identifying the date and time of reception, means for storing one or more said audio programs and said program identification information to a digital storage medium, means for signalling the presence of said audio program to a user, and means for playing any such stored audio program from said digital storage medium via integral D/A circuitry connected to an internal or external speaker system, on demand from a user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification