Method and apparatus for communication channel identification and signal restoration
First Claim
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1. 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;
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 bond width 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.
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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 (Ghost Cancellation Reference) 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.
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Citations
5 Claims
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1. A method for removing channel induced distortion from signals, comprising the steps of:
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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; 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 bond width 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. - View Dependent Claims (2)
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3. An apparatus for removing channel induced distortion from signals, comprising:
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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; 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. - View Dependent Claims (4)
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5. An apparatus for substantially eliminating ghosts occurring during the transmission of a television signal, wherein said television signal comprises a ghost cancellation reference signal, said apparatus comprising:
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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 first selected component and at least one second selected component; c) means for transferring energy from said second selected component to said first selected component.
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Specification