Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-08-25
1979-09-04
Bookbinder, Marc E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77R, 325332, H04B 1700
Patent
active
041669800
ABSTRACT:
A method and apparatus are provided for sorting signals from compressive receivers in accordance with the type of modulation on the signal, so as to be able to establish the identity of the signal short of fully demodulating it. It has been found that signals from a compressive receiver which are insufficiently sampled for complete demodulation can be identified by "histograms" in which each designated condition, such as the number of consecutive 1's or 0's is graphed against the number of occurrences of this designated condition over a period of time, designated a "data collection interval." The result is a pattern or diagram which is characteristic of the modulation type, such that FSK, DFSK, PSK, hand morse, machine morse, anomolous morse, AM, SSB, and multitones can be distinguished one from another. Moreover, it is possible to recognize two-way voice communication.
REFERENCES:
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patent: 3465247 (1969-09-01), Kubo
patent: 3560852 (1971-02-01), Haskin et al.
patent: 3568054 (1971-03-01), Ross
patent: 3743942 (1973-07-01), Carpenter
patent: 3820025 (1974-06-01), Lahr et al.
patent: 3880147 (1975-04-01), Gruenke et al.
patent: 3982101 (1976-09-01), Kalb et al.
Apostolos John T.
Boland Robert P.
Bookbinder Marc E.
Etlinger Louis
Funk Joseph E.
Sanders Associates Inc.
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