Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-05-20
1981-09-08
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
350 9614, H03K 1302
Patent
active
042887852
ABSTRACT:
The invention relates to a light intensity modulator controlled by a "word" of n bits and an opto-electronic digital-analog converter.
The modulator comprises a two-arm interferometer in whose length there is created, by opto-electrical effect, successive phase shifts controlled respectively by control bits and whose values, when the control bits are in state 1, conform to the successive powers of 2. The total phase shift obtained thus depends directly on the analog value of the control word and the emerging intensity is modulated as a function of this word. A digital-analog converter is constructed by adding a photodetector means whose output voltage depends on the analog value of the control word.
REFERENCES:
patent: 3920314 (1975-11-01), Yajima
patent: 3957340 (1976-05-01), Giallorenzi
patent: 4070094 (1978-01-01), Martin
patent: 4223977 (1980-09-01), Papuchon
Hudson "RCA Technical Notes" TN No. 928, Apr. 26, 1973, pp. 1-3.
Hardy "IBM Technical Disclosure Bulletin" vol. 7 No. 6 Nov. 1964 pp. 480-481.
Hammer "Applied Physics Letters" vol. 18 No. 4 Feb. 15, 1971 pp. 147-149.
Papuchon "Electronics Letters" Feb. 14, 1980 vol. 16 No. 4 pp. 142-144.
Anne Jean C.
Papuchon Michel
Puech Claude
"Thomson-CSF"
Miller Charles D.
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