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Analog-to-digital converter

Assignee: Westinghouse Electric Corp
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Filing: 1971-09-29
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Granted: 1973-12-25
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Expires: 1991-09-29
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Abstract

Abstract Apparatus is disclosed for the conversion of an analog signal to its sampled digital form. The conversion is accomplished by deflecting a collimated beam of light with an electro-optic device driven by the analog signal. A plurality of light activated elements or phototransistors are positioned in the path of beam after it passes through the electro-optic device. The light activated elements are arranged in a predetermined pattern such that as the level of the analog signal varies and thus the deflection of the beam varies, different ones of the elements are correspondingly activated. Means including electrical circuit apparatus is connected to the elements for providing a digital output representative of the analog signal.

Inventors

  • 👤 C Huber

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 11:46
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/26

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 223 words
An analog-to-digital converter comprising: a. means for producing a collimated beam of light, b. a first electro-optic device in the path of said beam of coherent light for deflecting said beam in a first predetermined direction as a function of the level of an analog signal, c. a second electro-optic device in the path of said coherent light for deflecting said beam in a direction orthogonal to the deflection of the beam by said first electro-optical device, d. a plurality of light activated sensing elements positioned in an M-N type matrix where M represents columns and N represents rows, said matrix being disposed generally at right angles to said light beam to be scanned thereby after it passes through said electro-optical devices, e. all of said elements in any one row being designed to generate signals of the same type in response to said collimated beam of light, f. all of said elements in different rows producing an output signal which is different from that produced by the elements in the next adjacent rows, g. all of said elements being capable of retaining their excited state until read out by the application of read-out signals to said mosaic, h. means including electrical circuit apparatus connected to said light activated elements for providing a digital output representative of sampled points of said analog signal.
Claim 2
Dependent Claim 223 words
An analog-to-digital converter comprising: a. means for producing a collimated beam of light, b. a first electro-optic device in the path of said beam of coherent light for deflecting said beam in a first predetermined direction as a function of the level of an analog signal, c. a second electro-optic device in the path of said coherent light for deflecting said beam in a direction orthogonal to the deflection of the beam by said first electro-optical device, d. a plurality of light activated sensing elements positioned in an M-N type matrix where M represents columns and N represents rows, said matrix being disposed generally at right angles to said light beam to be scanned thereby after it passes through said electro-optical devices, e. all of said elements in any one row being designed to generate signals of the same type in response to said collimated beam of light, f. all of said elements in different rows producing an output signal which is different from that produced by the elements in the next adjacent rows, g. all of said elements being capable of retaining their excited state until read out by the application of read-out signals to said mosaic, h. means including electrical circuit apparatus connected to said light activated elements for providing a digital output representative of sampled points of said analog signal.
Claim 3
Dependent Claim 42 words
The combination as set forth in claim 1 wherein the deflections of said second electro-optical device are synchronized with the reflections of said first electro-optical device to scan said columns to produce output signals from elements in said columns in immediate sequence.
Claim 4
Dependent Claim 56 words
The combination as set forth in claim 1 wherein said second electro-optical device directs the light beam at successive intervals from one column to the next adjacent column so that the elements of the next adjacent column can be activated before the last element in an adjacent column has completed its response to the light beam.
Claim 5
Dependent Claim 42 words
The combination as set forth in claim 1, including means disposed between said first and second electro-optical devices for directing said beam as it emerges from said first electro-optical device to preselected locations on said second electro-optical device at said preselected locations.
Claim 6
Dependent Claim 26 words
The combination as set forth in claim 1 wherein said means disposed between said first and second electro-optical devices comprises a plurality of fiber optic devices.

References Cited (Backward Citations)

US3521271A Cited
US3543248A Cited
US3535684A Cited
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US3688281A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-24 1977-06-25 1977-12-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-24 1981-06-25 1981-12-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-24 1985-06-25 1985-12-25 $7700.00 Window Closed / Lapsed

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