Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-12-18
1978-04-25
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
235 92MP, 250231SE, 73384, 244180, G01D 534, H03K 1302
Patent
active
040865800
ABSTRACT:
In one exemplar embodiment, a digital altitude encoder is provided that utilizes a conventional altimeter responsive to atmospheric pressure for rotationally driving an indicator shaft. Attached to the shaft is a disc having repetitive, alternate, regularly disposed solid portions and slots. A light source and a pair of light detectors for receiving light from the source are spaced adjacent the disc to permit one of the detectors to generate a first signal and the other detector to generate a second signal having a relative time of occurrence dependent on the direction of the rotation of the disc. A counting means that is presettable to a predetermined digital count representative of a preselected altitude function receives the first and second signals and increments or decrements the predetermined count in response to changes in altitude. A code conversion circuit receives the digital signal output from the counter and converts the digital signal to a parallel digital code acceptable for transmission of aeronautical altitude information.
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patent: 2750801 (1956-06-01), Fauvelot
patent: 3271758 (1966-09-01), Stultz et al.
patent: 3353408 (1967-11-01), Daleo
patent: 3513708 (1970-05-01), Springer
patent: 3662347 (1972-05-01), Fox
patent: 3750473 (1973-08-01), Bennett et al.
patent: 3839626 (1974-10-01), Klem et al.
patent: 3906223 (1975-09-01), White
patent: 3918307 (1975-11-01), Hulle et al.
patent: 3940990 (1976-03-01), Younkin
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