Binary signal decoding apparatus and method
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United States of America Patent
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Feb 5, 1985
Grant Date -
N/A
app pub date -
Sep 17, 1982
filing date -
Sep 17, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method is provided for decoding a transmitted comma free coded signal, having a plurality of bits and two message frequencies, and suitable for application in controlling the passenger doors of a vehicle station. A sampling of the signal bits is made at a rate that is a multiple of the known transmission rate and a predetermined selection relationship is applied to make unnecessary the provisions of receiver synchronization apparatus responsive to the transmission rate control clock. This selection relationship involves summing the values of an odd plurality of sample points during a bit period and comparing this sum to a predetermined number to determine the binary value of the bit.
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