Communications: electrical – Systems – Call station
Patent
1974-07-02
1976-06-01
Pitts, Harold I.
Communications: electrical
Systems
Call station
340152T, G08B 1300, G08B 2100
Patent
active
039613224
ABSTRACT:
Real time signal detection circuitry suitable for detection of a resonant tag such as in an electronic security system. True received signals are detected in the presence of high background noise by application of the received signal to a series of pulse height and width threshold detectors which are enabled in a desired sequence. Detection of a series of pulse components comprising an expected signal waveform, having predetermined height and width and occurring in a desired sequence and time relationship provides an alarm indication. A plurality of parallel filters may receive the input signal to produce different waveform configurations for parallel coincidence processing. The circuitry of the invention provides extremely sharp signal discrimination without the use of video delay lines such as used in cross-correlation systems and enables non-repetitive signals to be detected in real time with great accuracy.
REFERENCES:
patent: 3863244 (1975-01-01), Lichtblau
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