EP0511708A2
Expired / Lapsed
EP
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Method and apparatus for communication channel identification and signal restoration
Assignee: Koninklijke Philips NV
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Filing: 1992-04-22
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Granted: —
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Expires: 2012-04-22
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
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:57
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H04L; H04L1/00; H04L1/24; H04L1/242; H04L25/00; H04L25/02; H04L25/0202; H04L25/0212; H04L25/024; H04L25/0242; H04L25/0244; H04N5/211; H04N7/00; H04N7/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 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; characterized in that the method further comprises the steps of c) subjecting said sequence of coefficients to a transformation process so as to transform it from its time domain state to its frequency domain state; d) widening the bandwidth of said sequence of coefficients in said frequency domain state; and e) subjecting said widened bandwidth frequency domain state to an inverse transform process so as to transform it into its time domain state.
Claim 2
Independent Claim
122 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; characterized in that the method further comprises the steps of c) subjecting said sequence of coefficients to a transformation process so as to transform it from its time domain state to its frequency domain state; d) widening the bandwidth of said sequence of coefficients in said frequency domain state; and e) subjecting said widened bandwidth frequency domain state to an inverse transform process so as to transform it into its time domain state.
Claim 3
Dependent Claim
38 words
The method of claim 1 characterized in that said whitening step comprises duplicating a plurality of non-zero values within said frequency domain state so as to replace values within said frequency domain state which are equal to zero.
Claim 4
Independent Claim
112 words
An apparatus for removing channel induced distortion from signal, 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; characterized in that the apparatus further comprises c) means for processing said sequence of coefficients so as to transform it from its time domain state to its frequency domain state; d) means for widening the bandwidth of said sequence of coefficients in said frequency domain state; and e) means for processing said widened bandwidth frequency domain state into its time domain state.
Claim 5
Independent Claim
112 words
An apparatus for removing channel induced distortion from signal, 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; characterized in that the apparatus further comprises c) means for processing said sequence of coefficients so as to transform it from its time domain state to its frequency domain state; d) means for widening the bandwidth of said sequence of coefficients in said frequency domain state; and e) means for processing said widened bandwidth frequency domain state into its time domain state.
Claim 6
Dependent Claim
11 words
A television receiver comprising the apparatus as claimed in claim 3.
Claim 7
Independent Claim
109 words
An apparatus for substantially eliminating ghosts occurring during their transmission of a television signal, wherein said television signal comprises a ghost cancellation reference signal, said apparatus comprising: a) means for receiving said television signal and for separating therefrom said ghost cancellation reference signal as distorted by said transmission. b) means for deriving from said received ghost cancellation reference signal a sequence of coefficients to be used with at least one filter, said sequence of coefficients having at least one major component and at least one minor component; characterized in that the apparatus further comprises c) means for transferring energy from said minor ghost component to said major ghost component.
Claim 8
Independent Claim
109 words
An apparatus for substantially eliminating ghosts occurring during their transmission of a television signal, wherein said television signal comprises a ghost cancellation reference signal, said apparatus comprising: a) means for receiving said television signal and for separating therefrom said ghost cancellation reference signal as distorted by said transmission. b) means for deriving from said received ghost cancellation reference signal a sequence of coefficients to be used with at least one filter, said sequence of coefficients having at least one major component and at least one minor component; characterized in that the apparatus further comprises c) means for transferring energy from said minor ghost component to said major ghost component.
References Cited (Backward Citations)
No citation records indexed.
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