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US4949177A
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Method and apparatus for carrying out a non-linear operation on a digital signal
Assignee: Grass Valley USA LLC
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Filing: 1988-09-19
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Granted: 1990-08-14
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Expires: 2008-09-19
Abstract
Abstract A digital input signal having a sampling frequency f is interpolated by a factor N, where N is a positive integer, whereby a first digital signal having a sampling frequency Nf is generated. A non-linear operation is carried out on the first digital signal having the sampling frequency Nf and a second digital signal having the sampling frequency Nf is provided. The second digital signal is decimated by the factor N and thereby provides a digital output signal having the sampling frequency f.
Inventors
- 👤 Richard S. Bannister
- 👤 Richard A. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:22
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/265
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A method of carrying out a non-linear operation on a digital input signal having a sampling frequency f, comprising: interpolating the digital input signal by a factor N, where N is a positive integer, whereby a first digital signal having a sampling frequency Nf is generated, carrying out a non-linear operation on the first digital signal having the sampling frequency Nf and providing a second digital signal having the sampling frequency Nf, and decimating the second digital signal by the factor N and thereby providing a digital output signal having the sampling frequency f.
Claim 2
Independent Claim
94 words
A method of carrying out a non-linear operation on a digital input signal having a sampling frequency f, comprising: interpolating the digital input signal by a factor N, where N is a positive integer, whereby a first digital signal having a sampling frequency Nf is generated, carrying out a non-linear operation on the first digital signal having the sampling frequency Nf and providing a second digital signal having the sampling frequency Nf, and decimating the second digital signal by the factor N and thereby providing a digital output signal having the sampling frequency f.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the non-linear operation includes a clipping operation.
Claim 4
Dependent Claim
25 words
A method according to claim 1, wherein the digital input signal is a wipe signal and the non-linear operation is a clip and gain operation.
Claim 5
Dependent Claim
22 words
A method according to claim 3, wherein the interpolating step comprises interpolating the wipe signal by the factor N in one dimension.
Claim 6
Dependent Claim
22 words
A method according to claim 3, wherein the interpolating step comprises interpolating the wipe signal by the factor N in two dimensions.
Claim 7
Dependent Claim
103 words
Apparatus for carrying out a non-linear operation on a digital input signal having a sampling frequency f, comprising: means for interpolating the digital input signal by a factor N, where N is a positive integer, whereby a first digital signal having a sampling frequency Nf is generated, non-linear means connected to receive the first digital signal having the sampling frequency Nf and to carry out a non-linear operation thereon to provide a second digital signal at the sampling frequency Nf, and means for decimating the second digital signal by the factor N to provide a digital output signal having the sampling frequency f.
Claim 8
Dependent Claim
103 words
Apparatus for carrying out a non-linear operation on a digital input signal having a sampling frequency f, comprising: means for interpolating the digital input signal by a factor N, where N is a positive integer, whereby a first digital signal having a sampling frequency Nf is generated, non-linear means connected to receive the first digital signal having the sampling frequency Nf and to carry out a non-linear operation thereon to provide a second digital signal at the sampling frequency Nf, and means for decimating the second digital signal by the factor N to provide a digital output signal having the sampling frequency f.
Claim 9
Dependent Claim
26 words
Apparatus according to claim 6, wherein the non-linear means comprise clipping means for limiting the range of the first digital signal having the sampling frequency Nf.
Claim 10
Dependent Claim
15 words
Apparatus according to claim 6, wherein the non-linear means comprise a clip and gain circuit.
Claim 11
Dependent Claim
25 words
Apparatus according to claim 8, wherein the means for interpolating the digital input signal comprise means for interpolating by the factor N in two dimensions.
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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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |