SCA Data transmission system with a raised cosine filter
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United States of America Patent
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Nov 22, 1983
Grant Date -
N/A
app pub date -
Nov 8, 1979
filing date -
Nov 8, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for transferring digital data via the sub-carrier of a commercial broadcast FM radio station. Digital data generated by an originating subscriber is shaped with substantially a raised cosine response in the time domain. The shaped signal is then pre-emphasized and used to frequency modulate (direct angle modulate) a sub-carrier. The sub-carrier in turn frequency modulates the carrier and the data is transmitted by the radio station along with its commercial program. A receiving subscriber detects the sub-carrier and decodes and displays the originated data.
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