Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1985-10-11
1987-12-08
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 356222, 356230, H03M 136
Patent
active
047120894
ABSTRACT:
Methods and apparatus for all-optical analog to digital conversion. An analog optical input signal is directed along a path comprising a series of level sensing means for determining whether its intensity is above or below a threshold value. The optical signals from successive level sensing means are directed in pairs to optical exclusive-or gates to provide a digital optical signal to at least one of a plurality of individual optical output means according to a designated digital coding system whereby the optical digital indication corresponds to the sensed level of intensity of the analog optical input signal. Apparatus comprising channel waveguides and integrated optical devices provide economical systems for high-speed computation and other uses.
REFERENCES:
patent: 3599545 (1971-08-01), Durr et al.
patent: 3864529 (1975-02-01), Tracey et al.
patent: 3964064 (1976-06-01), Brandao et al.
Nordstrom, High-Speed Integrated A/D Converter, 1976 IEEE International Solid-State Circuits Conference, p. 150.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-12 to II-17; II-52 to II-54.
Battelle (Memorial Institute)
Dunson Philip M.
Sloyan T. J.
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