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US4667239A
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Signal peaking device for single-line video input
Assignee: Texas Instruments Inc
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Filing: 1984-08-06
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Granted: 1987-05-19
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Expires: 2004-08-06
Abstract
Abstract A signal peaking device for a single line video input has a transversal filter with a plurality of sample and hold (S & H) circuits, a corresponding plurality of line drivers and output switches. The output switches are connected to a plurality of weighting circuits and a summer that sums the weighted output of the output switches. A free running digital shift register generates the sample pulse that operates the sample and hold circuits.
Inventors
- 👤 Dana Dudley
- 👤 Charles C. Hefner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:14
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N25/00; H04N25/60; H04N25/65; H04N25/67
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A signal peaking device for a sampled system comprising: a transversal filter means having a peaking function symmetrical in time for producing a peak signal, the transversal filter means includes, a plurality of n sample stage means for converting a signal to be filtered into m times n time discrete elements, each sample stage means includes a second plurality of m holding stages for holding each of said time discrete elements in a predetermined one of said holding stages in each sample stage means, where n and m are positive integers; and combining means for combining said time discrete elements held in the respective predetermined holding stages with like time discrete elements held in said predetermined holding stages of each member of the plurality of n sample stage means to obtained a plurality of m combined signals.
Claim 2
Dependent Claim
137 words
A signal peaking device for a sampled system comprising: a transversal filter means having a peaking function symmetrical in time for producing a peak signal, the transversal filter means includes, a plurality of n sample stage means for converting a signal to be filtered into m times n time discrete elements, each sample stage means includes a second plurality of m holding stages for holding each of said time discrete elements in a predetermined one of said holding stages in each sample stage means, where n and m are positive integers; and combining means for combining said time discrete elements held in the respective predetermined holding stages with like time discrete elements held in said predetermined holding stages of each member of the plurality of n sample stage means to obtained a plurality of m combined signals.
Claim 3
Dependent Claim
28 words
The signal peaking device according to claim 1 wherein the combing means further comprises: summing means for summing the m combined signals to obtained the peak signal thereby.
Claim 4
Dependent Claim
38 words
The signal peaking device according to claim 2 wherein the summing means further comprises: weighting means for weighting each member of the plurality of m combined signals with predetermined weights prior to being summed by the summing means.
Claim 5
Dependent Claim
40 words
The signal peaking device according to claim 1 further comprising: pulse means for sequentially providing a holding pulse to each member of the second plurality of m holding stages of each member of the plurality of n sample stage means.
Claim 6
Independent Claim
134 words
A method of performing a peaking function for a single-line video input consisting of the steps of: a. sampling each pixel of information from the single-line video input; b. storing said each pixel sampled in at least five places simultaneously in a storing mechanism for forming a plurality of sets of pixels whereby said each pixel is located in sequential positions in the plurality of sets; c. beginning at a preselected time, reading out sequentially the plurality of sets of pixels; d. Symmetrically weighting each of said sets of pixels sequentially whereby a portion of the single-line video input of said each set is weighted at times prior to and after a center pixel of said each set; and e. summing the weighted pixels for peaking said each pixel of the single-line video input.
Claim 7
Independent Claim
134 words
A method of performing a peaking function for a single-line video input consisting of the steps of: a. sampling each pixel of information from the single-line video input; b. storing said each pixel sampled in at least five places simultaneously in a storing mechanism for forming a plurality of sets of pixels whereby said each pixel is located in sequential positions in the plurality of sets; c. beginning at a preselected time, reading out sequentially the plurality of sets of pixels; d. Symmetrically weighting each of said sets of pixels sequentially whereby a portion of the single-line video input of said each set is weighted at times prior to and after a center pixel of said each set; and e. summing the weighted pixels for peaking said each pixel of the single-line video input.
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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |