Patent
1978-03-27
1979-12-11
Safourek, Benedict V.
325302, 325325, H04B 106
Patent
active
041785495
ABSTRACT:
A system for recognizing a received encoded signal as being from a particular transmitter is disclosed. An encoder encodes a signal to have a predetermined sequence of pulses of three different predetermined sequence of pulses of three different predetermined durations within a constant bit interval in accordance with a trinary code; wherein each of the different predetermined durations corresponds to a different bit. A decoder is coupled to the receiver for recognizing the received encoded signal as being from the particular transmitter includes a programmable digital logic signal generator that is programmed in accordance with the trinary code for generating a programmed digital logic signal having a predetermined sequence of different digital words corresponding to the predetermined sequence of pulses of different predetermined durations in the transmitted encoded signal; a code converter for converting the received encoded signal to a decoded digital logic signal having digital words in accordance with the selected code by measuring and comparing the relative durations of the pulse and the non-pulse time during each bit interval; a comparator for comparing the decoded digital logic signal with the programmed digital logic signal; and a control logic circuit coupled to the programmable signal generator, the code converter and the comparator for synchronizing the programmed digital logic signal with the decoded digital logic signal and for recognizing the received encoded signal as being from the transmitter when said comparison indicates a predetermined number and sequence of valid comparisons between the decoded digital logic signal and the programmed digital logic signal.
REFERENCES:
patent: Re29525 (1978-01-01), Willmott
patent: 3906348 (1975-09-01), Willmott
patent: 4037201 (1977-07-01), Willmott
patent: 4047107 (1977-09-01), Dickinson
patent: 4072898 (1978-02-01), Hellman
patent: 4087793 (1978-05-01), Lucas
patent: 4095211 (1978-06-01), Shaughnessy
patent: 4114142 (1978-09-01), Wycoff
Ledenbach Gregory W.
Morris Dennis E.
Masinick Michael A.
National Semiconductor Corporation
Safourek Benedict V.
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