Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1976-12-07
1979-01-30
Richardson, Robert L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
325 38A, 325164, 328 30, 328157, 328158, 340355, H04B 104
Patent
active
041375009
ABSTRACT:
My invention relates to the hookup of electrical and mechanical devices for use in a frequency dependent amplitude modulated exciter apparatus. My invention provides a higher first frequency alternating current source of electromagnetic power which is methodically modulated in amplitude at numerous lower order concurrent second frequency pulse train rates wherein each particular second frequency impulse rate causes an orderly succession of singular bursts of said first frequency energy wherein the duration of each burst represents less than one total cycle period of the highest of the lower order second frequency pulse train rates whereupon the magnitude of each said singular burst of said first frequency is at an absolute amplitude which is greatest for the less frequently occurring second frequency pulse train rates and least amplitude for the most frequently occurring second frequency rates. My invention has particular application as a source of first frequency power which is recovered by a detector apparatus arranged so as to respond to the individual amplitude steps of said second frequency pulse train imposed on said first frequency and dependent on the instantaneous amplitudes of the said second frequency steps. Such a level responsive detector will recover a component second frequency the rate of which is dependent on the composite first frequency amplitude.
REFERENCES:
patent: 3299356 (1967-01-01), Bornhorst et al.
patent: 3432773 (1969-03-01), Land et al.
patent: 3549818 (1970-12-01), Turner
patent: 3559067 (1971-01-01), Genest et al.
patent: 3579117 (1971-05-01), Norris et al.
Bookbinder Marc E.
Richardson Robert L.
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