US4495586A
Expired / Lapsed
US
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Waveform acquisition apparatus and method
Assignee: Tektronix Inc
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Filing: 1982-07-29
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Granted: 1985-01-22
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Expires: 2002-07-29
Abstract
Abstract A waveform acquisition apparatus and method permits a plurality of samples of an input signal to be taken for each trigger recognition event, and stored at predetermined memory addresses to provide a complete equivalent-time waveform in which all accumulated samples are in correct time relation to each other. The mathematical determination of each address is obtained by measuring the time difference between a trigger recognition event on each cycle of a repetitive signal and a next occurring sample clock following each trigger recognition event, and then using a microprocessor to compute the relative addresses.
Inventors
- 👤 Roland E. Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:51
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A method of acquiring an equivalent-time waveform over a plurality of cycles of a repetitive input signal, comprising the steps of: taking one or more samples at equally spaced intervals of a sample clock along each cycle of said plurality of cycles; measuring the time difference between a fixed point on said each cycle and a next occuring sample clock; computing from said measured time difference an address of a memory for each of said samples, wherein said computed addresses are at equally-spaced intervals with respect to each other for each cycle, but shifted a number of addresses proportional to said time difference; and storing said samples in said memory at said computed addresses.
Claim 2
Independent Claim
114 words
A method of acquiring an equivalent-time waveform over a plurality of cycles of a repetitive input signal, comprising the steps of: taking one or more samples at equally spaced intervals of a sample clock along each cycle of said plurality of cycles; measuring the time difference between a fixed point on said each cycle and a next occuring sample clock; computing from said measured time difference an address of a memory for each of said samples, wherein said computed addresses are at equally-spaced intervals with respect to each other for each cycle, but shifted a number of addresses proportional to said time difference; and storing said samples in said memory at said computed addresses.
Claim 3
Independent Claim
17 words
An apparatus for acquiring an equivalent-time waveform over a plurality of cycles of a repetitive signal, comprising:
Claim 4
Independent Claim
17 words
An apparatus for acquiring an equivalent-time waveform over a plurality of cycles of a repetitive signal, comprising:
Claim 5
Dependent Claim
100 words
means for taking one or more samples at equally spaced intervals of a sample clock along each cycle of said plurality of cycles; means for measuring the time difference between a fixed point on said cycle and a next occurring sample clock; means for computing from said measured time difference an address of a memory for each of said samples, wherein said computed addresses are at equally-spaced intervals with respect to each other for each cycle, but shifted a number of addresses proportional to said time difference; and means for storing said samples in said memory at said computed addresses.
Claim 6
Dependent Claim
100 words
means for taking one or more samples at equally spaced intervals of a sample clock along each cycle of said plurality of cycles; means for measuring the time difference between a fixed point on said cycle and a next occurring sample clock; means for computing from said measured time difference an address of a memory for each of said samples, wherein said computed addresses are at equally-spaced intervals with respect to each other for each cycle, but shifted a number of addresses proportional to said time difference; and means for storing said samples in said memory at said computed addresses.
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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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |