Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1976-01-16
1977-04-19
Kominski, John
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
178 88, 329104, 325 38R, 325321, H03K 904
Patent
active
040191494
ABSTRACT:
A demodulator for differentially coherent phase-shift keyed data signals correlates samples taken in consecutive baud intervals. Received digital data signals are hardlimited to preserve zero-crossings only and samples of such hardlimited signals are temporarily stored in a delay structure. Polarity correlations are made between two pairs of samples relatively delayed by a baud interval less 45.degree., and a baud interval plus 45.degree., of carrier wave phase. These direct correlations control the counting direction of separate reversible counters. A further indirect correlation is made between the direct correlations and this third correlation is used to inhibit or not the operation of the reversible counters. The count-up, count-down and inhibit pattern constitutes ternary processing of binary data. The resultant counts are decoded at the end of each baud interval by observing whether the net count has been up or down. The counters are reset. The polarity states of the counters are directly registered in a pair of bistable circuits as decoded data bits without regard to count magnitude and without further logic operations.
REFERENCES:
patent: 3729684 (1973-04-01), Shuda
patent: 3747003 (1973-07-01), Siglow
patent: 3938052 (1976-02-01), Glasson
Kustka George John
Mueller Kurt Hugh
Bell Telephone Laboratories Incorporated
Kearns Joseph P.
Kominski John
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