Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1959-02-13
1993-04-13
Barron, Jr., Gilberto
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
328109, 34082558, 34082561, 34082569, H03K 5159, G08C 1928
Patent
active
052026787
ABSTRACT:
An electronic recognition unit indicates that a flow of received information is starting when a desired bi-phased pulsed ratio signal starts to be received. The recognition unit discriminates against both noise and spurious radio signals. Desired signals are made recognizable by reversing, upon transmission, the phase of the carrier for a prescribed pattern of pulses. This technique prevents responding to unqualified continuous-wave signals. The relative phases of adjacent radio-frequency pulses of the desired pulse train convey the recognition information. When the phases of two adjacent pulses are the same a positive audio-pulse output is obtained, and if their phases differ by 180 degrees the output is negative. For a predetermined number of pulses, for example fourteen, the resulting positive and negative audio pulses are added in an audio delay circuit with appropriate inversion of the sign of the intentionally negative pulses. The procedure produces relatively large recognition signals, only when the incoming pulse train has the prescribed phase pattern.
REFERENCES:
patent: 2706810 (1955-04-01), Jacobson
patent: 2752507 (1956-06-01), Dureau
patent: 2909657 (1959-10-01), Aurell
patent: 2977542 (1961-03-01), Lutz
Dell Bernard H.
Taber John E.
Ail Systems, Inc.
Barron Jr. Gilberto
Grace C. H.
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