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US3568166A
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Method and device for digital analysis
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1969-02-27
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Granted: 1971-03-02
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Expires: 1989-02-27
Abstract
Abstract A recurrent signal consisting of pulses which can be identified in time is analyzed in order to extract the signal from the background noise; samples of a first pulse are taken at instants which are separated by predetermined time intervals Upsilon , and digitalized, the result is written in an addressable digital memory channel by a digital adder-subtracter, a zero level determined by sampling by the same sampling circuit at a selected instant is subtracted from the contents of each channel of the digital memory and the same sequence is carried on a large number of pulses which come later than the first pulse the samples being added in the digital memory channels. The successive samples of a same pulse are stored in a plurality of time delaying channels each having an analogue storage capacitor. A single lengthening channel may be used and an intermediate memory device fed by the coder stores the zero level and applies it to the input of the adder-subtracter.
Inventors
- 👤 Herveline Jeudon
- 👤 Claude Fernandes
- 👤 Jean-Pierre Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:11
CPC Classifications
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Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
A method of digital analysis of a recurrent signal consisting of pulses which can be identified in time in order to extract said signal from the background noise, wherein said method comprises taking samples of a first pulse at instants which are separated by predetermined time intervals Upsilon , representing in digital code a sample to which there may be added a predetermined continuous level which is sufficient to prevent the application of negative signals to the digital-analogue coder, writing the result in an addressable digital memory channel by means of a digital adder-subtracter, subtracting from the contents of each of said channels of the digital memory device a zero level determined by sampling by means of the same sampling circuit at a selected instant with respect to the appearance of said pulse, carrying out the same operations on a large number of pulses which come later than the first pulse and collecting the samples in said digital memory channels by means of the adder to which are simultaneously applied the contents of each of said channels in turn and at the output of the coder.
Claim 2
Independent Claim
186 words
A method of digital analysis of a recurrent signal consisting of pulses which can be identified in time in order to extract said signal from the background noise, wherein said method comprises taking samples of a first pulse at instants which are separated by predetermined time intervals Upsilon , representing in digital code a sample to which there may be added a predetermined continuous level which is sufficient to prevent the application of negative signals to the digital-analogue coder, writing the result in an addressable digital memory channel by means of a digital adder-subtracter, subtracting from the contents of each of said channels of the digital memory device a zero level determined by sampling by means of the same sampling circuit at a selected instant with respect to the appearance of said pulse, carrying out the same operations on a large number of pulses which come later than the first pulse and collecting the samples in said digital memory channels by means of the adder to which are simultaneously applied the contents of each of said channels in turn and at the output of the coder.
Claim 3
Dependent Claim
84 words
A method as claimed in claim 1, including the steps of storing successive samples of a same pulse in a plurality of lengthening channels comprising an analogue storage capacitor and then coding the contents of each channel in turn at a rate which is lower than the sampling rate, said storage of corresponding samples which are taken from two successive pulses being carried out in different analogue Channels and then subtracting the sample from each other by circular switching of all the lengthening channels.
Claim 4
Dependent Claim
48 words
A method as claimed in claim 1, including the steps of displacing the instants of sampling of each successive pulse relatively by a time interval Upsilon /n when passing from one pulse to the next and then coding these samples out at time intervals equal to Upsilon .
Claim 5
Dependent Claim
69 words
A method as claimed in claim 1 for analyzing a signal accompanied by a noise having a variance which is greater than the level of the signal, including the step of writing in in each channel of the digital memory device a predetermined content having a value which is greater than the variance in background noise in order to prevent any appearance of a negative content in the memory.
Claim 6
Dependent Claim
149 words
A digital analyzing device comprising at least one lengthening channel, means for applying to the channel or channels successive samples of a same pulse, a digital-analogue coder supplied by the lengthening device, a digital memory device having a number of channels at least equal to the number of samples, a digital adder-subtracter fed by the digital memory device and the coder, said memory device being coupled with the adder-subtracter so that each new sample coded in digital representation is added to or subtracted from the preceding contents of the corresponding channel of the memory device, and means including a synchronizing circuit coupled to said lengthening channels for placing in digital memory a level which is higher than the variance of the noise, reading and storing the zero level, adding the corresponding pulse samples to the contents of each channel of the memory device and subtracting the stored zero level.
Claim 7
Dependent Claim
149 words
A digital analyzing device comprising at least one lengthening channel, means for applying to the channel or channels successive samples of a same pulse, a digital-analogue coder supplied by the lengthening device, a digital memory device having a number of channels at least equal to the number of samples, a digital adder-subtracter fed by the digital memory device and the coder, said memory device being coupled with the adder-subtracter so that each new sample coded in digital representation is added to or subtracted from the preceding contents of the corresponding channel of the memory device, and means including a synchronizing circuit coupled to said lengthening channels for placing in digital memory a level which is higher than the variance of the noise, reading and storing the zero level, adding the corresponding pulse samples to the contents of each channel of the memory device and subtracting the stored zero level.
Claim 8
Dependent Claim
37 words
A device as claimed in claim 5, comprising one of said lengthening channels and an intermediate memory device fed by the coder for storing the zero level and applying said level to the input of the adder-subtracter.
Claim 9
Dependent Claim
102 words
A device as claimed in claim 5 comprising a plurality of lengthening channels each provided with a linear gate associated with a time base having a predetermined frequency for extracting the zero level or levels from the samples of a pulse and storing them in successive lengthening channels and a second linear gate also associated with a time base for coupling each lengthening channel in turn through a digital analogue coder to a digital adder-subtracter for summation of the sample and the contents of the corresponding channel of the addressable digital memory device or subtraction of the zero level from said contents.
Claim 10
Dependent Claim
22 words
A device as claimed in claim 5, wherein said synchronizing circuit including a means for producing the relative displacement of sampling instants.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |