Optical digital to analog converter

Details Optical digital to analog converter Optical digital to analog converter

1982-05-17

1985-09-17

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

364827, 455608, 455615, H03K 1302, H03K 1305

Patent

active

045423679

ABSTRACT:
Method and apparatus for conversion of digital multistate signals, represing a numerical value, to an optical output signal having an amplitude analogous to the numerical value. A controllable density optical transmission device provides plural optical signals representative of the digital states of components of the input signal. The plural optical signals are weighted and summed by optical filters to provide the desired analogous optical output representing the input numerical value. The use of phase shifting filters enables the conversion of negative and complex numbers. A two dimensional liquid crystal array may be used as the controllable optical transmission device to enable conversion of a plurality of numerical values simultaneously.

REFERENCES:
patent: 3407301 (1968-10-01), Kovanic
patent: 3821481 (1974-06-01), Melvin
patent: 3892468 (1975-07-01), Duguay
patent: 4205339 (1980-05-01), Howe

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