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US 5,329,472 AGranted
Method and apparatus for controlling coefficients of adaptive filter
AssigneeNEC Corporation
InventorAkihiko Sugiyama
Life of this patent
Estimating the term…
Abstract
A method or apparatus for controlling coefficients of an adaptive filter (3) for identifying unknown system or predicting periodic signals by correcting coefficients of the adaptive filter (3) in such a manner that the difference signal obtained by subtracting an output signal of the adaptive filter (3) from a mixed signal of the output signal from the unknown system and an interference signal comprises steps or means (9) for obtaining the information relating to the magnitude of the coefficients or output of the adaptive filter, and adaptively varying the amount of correction in coefficients of the adaptive filter in response to the obtained information.
Claims19
A method of controlling coefficients of an adaptive filter, said method comprising the steps of:
- obtaining a mixed signal by combining an interference signal with an output signal from an unknown system;
- obtaining an output signal generated by said adaptive filter, and subtracting said output signal generated by said adaptive filter from said mixed signal to obtain a difference signal;
- obtaining a square value of the output signal generated by the adaptive filter, and utilizing said square value of the output signal of the adaptive filter as obtained information relating to magnitude of the coefficients of said adaptive filter;
- and
- adaptively varying corrections applied to the coefficients of said adaptive filter according to said obtained information.
2 more elements
A method of controlling coefficients of an adaptive filter, said method comprising the steps of:
- obtaining a mixed signal by combining an interference signal with an output signal from an unknown system;
- obtaining an output signal generated by said adaptive filter, and subtracting said output signal of said adaptive filter from said mixed signal to obtain a difference signal;
- obtaining an absolute value of the output signal generated by the adaptive filter, and utilizing said absolute value of the output signal generated by the adaptive filter as obtained information relating to magnitude of the coefficients of said adaptive filter;
- and
- adaptively varying corrections applied to the coefficients of said adaptive filter according to said obtained information.
2 more elements
Electronic filter apparatus comprising:
- an adaptive filter which upon receiving a reference signal generates a pseudo output for an unknown system;
- first means for generating a mixed signal from interference signals and an output signal of the unknown system;
- a first subtracter for subtracting the pseudo output from said mixed signal;
- an information extraction circuit that receives coefficients for the adaptive filter to extract the information on the magnitude of said coefficients and generate an output (a);
- an arithmetic circuit to receive the output (a) for calculating and providing a signal (b) which decreases as the output (a) increases or increases as the output (a) decreases;
- second means for correcting the coefficients of the adaptive filter utilizing the outputs from the first subtracter, said arithmetic circuit and the reference signal;
- and
- said information extraction circuit comprising a square circuit for developing the output of said adaptive filter.
5 more elements
Electronic filter apparatus comprising:
- an adaptive filter which upon receiving a reference signal generates a pseudo output for an unknown system;
- first means for generating a mixed signal from interference signals and an output signal of the unknown system;
- a first subtracter for subtracting the pseudo output from said mixed signal;
- an information extraction circuit comprising a circuit that receives coefficients for the adaptive filter to extract the information on the magnitude of said coefficients and generate an output (a);
- an arithmetic circuit to receive the output (a) for calculating and providing a signal (b) which decreases as the output (a) increases or increases as the output (a) decreases;
- second means for correcting the coefficients of the adaptive filter utilizing the outputs from the first subtracter, said arithmetic circuit and the reference signal;
- and
- said information extraction circuit also comprising an absolute value circuit for developing an absolute value of the output of said adaptive filter.
5 more elements
Electronic filter apparatus comprising:
- an adaptive filter which upon receiving a reference signal generates a pseudo output for an unknown system;
- first means for generating a mixed signal from interference signals and an output signal of the unknown system;
- a first subtracter for subtracting the pseudo output from said mixed signal;
- an information extraction circuit that receives the output signal for the adaptive filter to extract the information on the magnitude of coefficients for the adaptive filter and generate an output (a);
- an arithmetic circuit to receive the output (a) for calculating and providing a signal (b) which decreases as the output (a) increases or increases as the output (a) decreases;
- second means for correcting the coefficients of the adaptive filter utilizing the outputs from the first subtracter, said arithmetic circuit and the reference signal;
- and
- said information extraction circuit comprising a square circuit for developing the output of said adaptive filter.
5 more elements
Electronic filter apparatus comprising:
- an adaptive filter which upon receiving a reference signal generates a pseudo output for an unknown system;
- first means for generating a mixed signal from interference signals and an output signal of the unknown system;
- a first subtracter for subtracting the pseudo output from said mixed signal;
- an information extraction circuit that receives the output signal of the adaptive filter to extract the information on the magnitude of coefficients for the adaptive filter and generate an output (a);
- an arithmetic circuit to receive the output (a) for calculating and providing a signal (b) which decreases as the output (a) increases or increases as the output (a) decreases;
- second means for correcting the coefficients of the adaptive filter utilizing the outputs from the first subtracter, said arithmetic circuit and the reference signal;
- and
- said information extraction circuit comprising an absolute value circuit for developing an absolute value of the output of said adaptive filter.
5 more elements
A method of controlling coefficients of an adaptive filter, said method comprising the steps of:
- obtaining a mixed signal by combining an interference signal with an output signal from an unknown system;
- obtaining an output signal generated by said adaptive filter, and subtracting said output signal generated by said adaptive filter from said mixed signal to obtain a difference signal;
- obtaining a square value of the output signal generated by the adaptive filter., and utilizing said square value of the output signal generated by the adaptive filter as obtained information relating to magnitude of the output signal of said adaptive filter;
- and
- adaptively varying corrections applied to the coefficients of said adaptive filter according to said obtained information.
2 more elements
A method of controlling coefficients of an adaptive filter, said method comprising the steps of:
- obtaining a mixed signal by combining an interference signal with an output signal from an unknown system;
- obtaining an output signal generated by said adaptive filter, and subtracting said output signal generated by said adaptive filter from said mixed signal to obtain a difference signal;
- obtaining an absolute value of the output signal generated by the adaptive filter, and utilizing an absolute value of the output signal generated by the adaptive filter as obtained information relating to magnitude of the output signal of said adaptive filter;
- and
- adaptively varying corrections applied to the coefficients of said adaptive filter according to said obtained information.
2 more elements
Dependencies are inferred from the claim text.