Communication over noisy lines
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United States of America Patent
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May 14, 1985
Grant Date -
N/A
app pub date -
Mar 7, 1983
filing date -
Mar 10, 1982
priority date (Note) -
Expired
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Abstract
In a line network communication system coded data signals are transmitted on a base band carrier signal and are recovered in a receiver. The receiver includes an exclusive OR gate and a shift register which operate in conjunction to compare, during successive time intervals, a series of coded reference signals and a succession of received signals shifted in phase relative to one another by respective amounts to generate respective comparison signals forming a set. A control unit causes a change in the relative phases of compared signals until the value of a comparison signal in a set indicates a degree of correlation exceeding a threshold value. Then, in a tracking mode, the control unit monitors the values of comparison signals generated in successive sets to verify that a degree of correlation exceeding the threshold value persists. If the verification is successful the control unit, in a locking mode, adjusts the relative phases of the compared signals to maintain a desired degree of correlation.
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Patent Owner(s)
- THORN EMI PATENTS LIMITED
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Clark, Duncan G D | Blackwater, Nr. Camberley, GB2 | 1 | 66 |
Kimber, Ian D | Bracknell, GB2 | 3 | 74 |
May, Roderick G | Wealdstone, GB2 | 1 | 66 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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