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US3763353A
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Retrospective pulse modulation decoding apparatus
Assignee: Individual
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Filing: 1971-09-27
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Granted: 1973-10-02
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Expires: 1991-09-27
Abstract
Abstract Digital data in self-timing reference is free from error due to irregular data spacing because of variations in speed and/or direction of scan in manual or machine applications with a pulse modulation of retrospective nature. Initially reference data manifestations are established and thereafter digital data are established partly on the basis of preceding manifestations of the data. In a binary data translating system, for example, a pair of reference pulses are spaced apart by a given interval. A binary unit is thereafter manifested by a pulse following at the same or similar interval and a binary zero is manifested by a pulse following at a differing interval. Each manifestation of a binary number thereafter depends on the interval between preceding pulses. A principle advantage of retrospective pulse modulation lies in demodulation. Large variations in spacing and relatively larger variations in the scanning speed are accommodated readily. Simple electric circuit demodulating means are used for measuring intervals between successive pulses and for comparing the measurements successively, indicating data of one nature or number by equal measurements and data of another by unequal measurements. Basic analog circuitry is described; digital circuitry is suggested.
Inventors
- 👤 E Nassimbene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:46
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G06; G06K; G06K7/00; G06K7/01; G06K7/016; G06K7/0166; H; H04; H04B; H04B14/00; H04B14/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
Retrospective pulse modulation apparatus for decoding data encoded as a series of substantially parallel lines entered on a record medium at two differing intervals between said lines, the data being represented by the comparative intervals between three successive ones of said lines, comprising an optical system for sensing said lines as printed on a document and producing a corresponding electric wave, an electric differentiating circuit coupled to said optical system for producing a train of bipolar pulsations from said electric wave, means coupled to said electric differentiating circuit for measuring intervals between successive pulsations of the same polarity, and means coupled to said measuring means for comparing the measurement of every interval with its adjacent successive interval and for outputting data of one nature in response to equal successive measurements and data of another nature in response to unequal successive measurements.
Claim 2
Dependent Claim
141 words
Retrospective pulse modulation apparatus for decoding data encoded as a series of substantially parallel lines entered on a record medium at two differing intervals between said lines, the data being represented by the comparative intervals between three successive ones of said lines, comprising an optical system for sensing said lines as printed on a document and producing a corresponding electric wave, an electric differentiating circuit coupled to said optical system for producing a train of bipolar pulsations from said electric wave, means coupled to said electric differentiating circuit for measuring intervals between successive pulsations of the same polarity, and means coupled to said measuring means for comparing the measurement of every interval with its adjacent successive interval and for outputting data of one nature in response to equal successive measurements and data of another nature in response to unequal successive measurements.
Claim 3
Dependent Claim
32 words
Retrospective pulse modulation apparatus for decoding data as defined in claim 1 and wherein said optical system includes optical filters interposed in said optical system for discriminating between a plurality of colors.
Claim 4
Dependent Claim
41 words
Retrospective pulse modulation apparatus for decoding data as defined in claim 1 and incorporating full wave rectifying circuitry interposed between said electric differentiating circuit and said measuring means for converting the train of bipolar pulsations to a train of unipolar pulsations.
Claim 5
Dependent Claim
172 words
Retrospective pulse modulation apparatus for decoding data manifested by a series of bars laid down on a document substantially parallel to and spaced one from the other for representing binary digital data by two associated pairs of bars, the binary digital values being represented by the comparative intervals between each pair of such associated pairs of bars, comprising means for scanning said series of bars on said document, means coupled to said scanning means for differentiating the output of said scanning means and thereby producing a train of bipolar pulses, means coupled to said differentiating means for measuring an interval between two successive pulses of the same polarity, means coupled to said differentiating means for measuring an interval between the succeeding two successive pulses of said same polarity, means coupled to said measuring means for comparing the measurements of the two intervals, and means coupled to said comparing means for outputting binary data of one nature in response to equal measurements and binary data of another nature in response to unequal measurements.
Claim 6
Dependent Claim
172 words
Retrospective pulse modulation apparatus for decoding data manifested by a series of bars laid down on a document substantially parallel to and spaced one from the other for representing binary digital data by two associated pairs of bars, the binary digital values being represented by the comparative intervals between each pair of such associated pairs of bars, comprising means for scanning said series of bars on said document, means coupled to said scanning means for differentiating the output of said scanning means and thereby producing a train of bipolar pulses, means coupled to said differentiating means for measuring an interval between two successive pulses of the same polarity, means coupled to said differentiating means for measuring an interval between the succeeding two successive pulses of said same polarity, means coupled to said measuring means for comparing the measurements of the two intervals, and means coupled to said comparing means for outputting binary data of one nature in response to equal measurements and binary data of another nature in response to unequal measurements.
Claim 7
Dependent Claim
185 words
Retrospective pulse modulation apparatus for decoding binary data manifested by a series of bars of two substantially differing widths laid down on a document substantially parallel to and spaced one from the other at two substantially differing widths for representing binary digital data by the edges of said bars, the binary diGital values being represented by the comparative intervals between each pair of said edges, comprising means for scanning said series of bars on said document, means coupled to said scanning means for differentiating the output of said scanning means and thereby producing a train of bipolar pulses corresponding to said edges of said bars, means coupled to said differentiating means for measuring an interval between two successive pulses of opposite polarity, means coupled to said differentiating means for measuring another interval between the succeeding two successive pulses of opposite polarity, means coupled to said measuring means for comparing the measurements of the two intervals, and means coupled to said comparing means for outputting binary data of one nature in response to equal measurements and binary data of another nature in response to unequal measurements.
Claim 8
Dependent Claim
185 words
Retrospective pulse modulation apparatus for decoding binary data manifested by a series of bars of two substantially differing widths laid down on a document substantially parallel to and spaced one from the other at two substantially differing widths for representing binary digital data by the edges of said bars, the binary diGital values being represented by the comparative intervals between each pair of said edges, comprising means for scanning said series of bars on said document, means coupled to said scanning means for differentiating the output of said scanning means and thereby producing a train of bipolar pulses corresponding to said edges of said bars, means coupled to said differentiating means for measuring an interval between two successive pulses of opposite polarity, means coupled to said differentiating means for measuring another interval between the succeeding two successive pulses of opposite polarity, means coupled to said measuring means for comparing the measurements of the two intervals, and means coupled to said comparing means for outputting binary data of one nature in response to equal measurements and binary data of another nature in response to unequal measurements.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |