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Variable parameter proportion self-adaptive filter

An adaptive filter, variable parameter technology, applied in the direction of adaptive network, impedance network, electrical components, etc., can solve the problem of large fluctuation of steady-state imbalance, and achieve the effect of low steady-state imbalance fluctuation.

Inactive Publication Date: 2014-04-09
SUZHOU UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a variable parameter proportional adaptive filter, which solves the problem that the IPNLMS adaptive filter has a very large fluctuation of steady-state imbalance at many time points due to its fast convergence speed

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  • Variable parameter proportion self-adaptive filter
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  • Variable parameter proportion self-adaptive filter

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Embodiment Construction

[0053] The above solution will be further described below in conjunction with specific embodiments. It should be understood that these examples are used to illustrate the present invention and not to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific system, and the unspecified implementation conditions are usually the conditions in routine experiments.

[0054] Example of Variable Parameter Scale Adaptive Filter

[0055] Such as figure 1 As shown, the variable parameter proportional adaptive filter includes:

[0056] Noise power estimation module: the function of this module is to estimate the power of system noise when the adaptive filter is static;

[0057] Error power estimation module: the function of this module is to estimate the power of the error signal by time smoothing the output error signal of the adaptive filter;

[0058] Intermediate variable generat...

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Abstract

The invention discloses a variable parameter proportion self-adaptive filter and belongs to the field of design of digital filters. The variable parameter proportion self-adaptive filter adopts a time-varying parameter to adjust a coefficient gain value of the self-adaptive filter. The time-varying parameter can be a monotone increasing function representing the specific value of the error signal power to the system noise power. In an initial phase of the self-adaptive filter, the specific value of the error signal power to the system noise power is larger, so that a large coefficient of the self-adaptive filter has a large gain value. In a convergence phase of the self-adaptive filter, the specific value of the error signal power to the system noise power is small, so that the large coefficient of the self-adaptive filter has a small gain value. Therefore, by adopting the variable parameter method, the high convergence speed of the proportion self-adaptive filter can be kept, and low steady state imbalance fluctuation of the proportion self-adaptive filter can be also obtained.

Description

technical field [0001] The invention belongs to the field of digital filter design, and relates to a coefficient update method of an adaptive filter, in particular to a proportional adaptive filter whose parameters are automatically adjusted. Background technique [0002] The coefficient vector of traditional digital filter is fixed. The main task of the traditional digital filter is to filter out the useless spectral components in the input signal, while retaining the required spectral components, so its operation mode is to obtain the output signal according to the input signal and the coefficient vector of the filter. Different from traditional filters with fixed coefficient vectors, adaptive filters can approach the unknown system according to the input and output signals of the unknown system. Since the essence of solving problems such as system identification, echo cancellation, active noise control, channel equalization, and interference cancellation is to obtain the...

Claims

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Application Information

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IPC IPC(8): H03H21/00
Inventor 倪锦根
Owner SUZHOU UNIV
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