US4309678A
Expired / Lapsed
US
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Sampling filter
Assignee: Thales SA
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Filing: 1980-01-30
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Granted: 1982-01-05
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Expires: 2000-01-30
Abstract
Abstract The invention relates to filters using a charge-transfer device as an active element it consists in providing such a filter with an output circuit of first order interpolator type; this circuit may be external to the charge-transfer device or partially integrated threwith by associating therewith an additional weighting cell and by using another set of weighting coefficients.
Inventors
- 👤 Jean-Edgar Picquendar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:32
CPC Classifications
H; H03; H03H; H03H19/00; H03H15/00; H03H15/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
In an analog sampling filter for filtering a stair-case signal from a charge-coupled device, the improvement comprising: a first order analog interpolating means for filtering said stair-case signal; a plurality of clocking means for dividing each step of said stair-case signals into segments for controlling the output of said charge-coupled device in coordination with the switching of said interpolation means to provide an output signal corresponding to said stair-case signals whose out-of band signals have been minimized.
Claim 2
Dependent Claim
77 words
In an analog sampling filter for filtering a stair-case signal from a charge-coupled device, the improvement comprising: a first order analog interpolating means for filtering said stair-case signal; a plurality of clocking means for dividing each step of said stair-case signals into segments for controlling the output of said charge-coupled device in coordination with the switching of said interpolation means to provide an output signal corresponding to said stair-case signals whose out-of band signals have been minimized.
Claim 3
Dependent Claim
53 words
The improved sampling filter of claim 1 wherein said first order interpolation comprises: a storage means for storing a first step of said stair-case signal; substraction means for substracting said first step from a second step of said stair-case signal and outputting a subtracted signal; and integrating means for integrating said subtracted signal.
Claim 4
Dependent Claim
91 words
In an analog sampling filter for filtering a stair-case signal from a charge-coupled device to provide a first set of n weighting coefficients a 1 , a 2 , . . . a n , the improvement comprising: said charge-coupled device having n+1 cells weighted in accordance with a second set of n+1 weighting coefficients a 1 , a 2 -a 1 , a 3 -a 2 , . . . a n - a n-1 , -a n ; integrating means for integrating the signal delivered by said charge-coupled device.
Claim 5
Dependent Claim
91 words
In an analog sampling filter for filtering a stair-case signal from a charge-coupled device to provide a first set of n weighting coefficients a 1 , a 2 , . . . a n , the improvement comprising: said charge-coupled device having n+1 cells weighted in accordance with a second set of n+1 weighting coefficients a 1 , a 2 -a 1 , a 3 -a 2 , . . . a n - a n-1 , -a n ; integrating means for integrating the signal delivered by said charge-coupled device.
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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |