Patent US5172232A successfully refreshed from Google Patents.
US5172232A
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Method and apparatus for communication channel identification and signal restoration
Assignee: Philips North America LLC
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Filing: 1992-01-09
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Granted: 1992-12-15
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Expires: 2012-01-09
Abstract
Abstract A method and apparatus for improved ghost cancellation for use in particular in television receivers. The sequence of coefficients derived from a received GCR signal, is further processed to effect a transfer of energy from minor echo coefficients to major echo coefficients thereby improving the overall performance of the ghost cancellation device.
Inventors
- 👤 David Koo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:52
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/24; H04L1/242; H04L25/00; H04L25/02; H04L25/0202; H04L25/0212; H04L25/024; H04L25/0242; H04L25/0244; H04N; H04N5/00; H04N5/14; H04N5/21; H04N5/211; H04N7/00; H04N7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
A method for removing channel induced distortion from signals, comprising the steps of: a) receiving a test signal after it has passed through and been distorted by a communication channel; b) deriving from said received test signal a sequence of coefficients to be used with at least one filter; and c) widening the bandwidth of said sequence of coefficients.
Claim 2
Independent Claim
59 words
A method for removing channel induced distortion from signals, comprising the steps of: a) receiving a test signal after it has passed through and been distorted by a communication channel; b) deriving from said received test signal a sequence of coefficients to be used with at least one filter; and c) widening the bandwidth of said sequence of coefficients.
Claim 3
Independent Claim
62 words
An apparatus for removing channel induced distortion from signals, comprising: a) means for receiving a test signal after it is passed through and been distorted by a communication channel; b) means for deriving from said received test signal a sequence of coefficients to be used with at least one filter; and c) means for widening the bandwidth of said sequence of coefficients.
Claim 4
Independent Claim
62 words
An apparatus for removing channel induced distortion from signals, comprising: a) means for receiving a test signal after it is passed through and been distorted by a communication channel; b) means for deriving from said received test signal a sequence of coefficients to be used with at least one filter; and c) means for widening the bandwidth of said sequence of coefficients.
Claim 5
Dependent Claim
11 words
A television receiver comprising the apparatus as claimed in claim 2.
References Cited (Backward Citations)
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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) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |