Patent
Tuned feedforward LMS filter with feedback control
Reads0
Chats0
TLDR
In this article, the authors proposed a method to automatically and adaptively tune a leaky, normalized least-mean-square (LNLMS) algorithm so as to maximize the stability and noise reduction performance in feedforward adaptive noise cancellation systems.Abstract:
A method to automatically and adaptively tune a leaky, normalized least-mean-square (LNLMS) algorithm (24) so as to maximize the stability and noise reduction performance in feedforward adaptive noise cancellation systems. The automatic tuning method provides for time-varying tuning parameters λk and µk that are functions of the instantaneous measured acoustic noise signal (12), weight vector length, and measurement noise variance. The method addresses situations in which signal-to-noise ratio varies substantially due to nonstationary noise fields, affecting stability, convergence, and steady-state noise cancellation performance of LMS algorithms. The method has been embodied in the particular context of active noise cancellation in communication headsets. However, the method is generic, in that it is applicable to a wide range of systems subject to nonstationary, i.e., time-varying, noise fields, including sonar, radar, echo cancellation, and telephony.read more
Citations
More filters
PatentDOI
Personal acoustic device position determination
TL;DR: In this paper, a method for determining an operating state of an earpiece of a personal acoustic device and/or the entirety of the personal acoustic devices by analyzing signals output by at least an inner microphone disposed within a cavity of a casing of the earpiece and an outer microphone disposed on the personal audio device in a manner acoustically coupling it to the environment outside the casing is presented.
Patent
Signal processing apparatus and signal processing method
TL;DR: In this article, a signal processing apparatus including a first decimation processing section for generating, based on a digital signal in a first form, a digital signals in a second form; a second decimation Processing Section for processing the digital signals based on the second form outputted from the interpolation processing section and the second signal processing section.
Patent
ANR signal processing topology
TL;DR: In this article, an ANR circuit, possibly of a personal ANR device, incorporates a branch in which feedback anti-noise sounds are generated from feedback reference sounds received from a feedback microphone.
PatentDOI
In-ear digital electronic noise cancelling and communication device
TL;DR: In this paper, an in-ear device is adapted to fit in the ear canal of a device user, and an external microphone senses an external acoustic signal outside the ear canals to produce a representative external microphone signal.
Patent
Method for adaptive control and equalization of electroacoustic channels
TL;DR: In this article, a transfer function estimate of the electroacoustic channel is established, responsive to the second audio signal and part of the first audio signal, and filters are obtained with transfer functions based on the estimate.
References
More filters
Journal ArticleDOI
The tap-leakage algorithm: An algorithm for the stable operation of a digitally implemented, fractionally spaced adaptive equalizer
TL;DR: In this article, a simple modification in the tap-adjustment algorithm was proposed to prevent the buildup of large coefficient values by systematically leaking or decreasing the magnitudes of all the equalizer tap weights.
Journal ArticleDOI
Leaky LMS algorithm: MSE analysis for Gaussian data
K. Mayyas,Tyseer Aboulnasr +1 more
TL;DR: An analytical treatment of the mean-square error (MSE) performance for the leaky LMS adaptive algorithm for Gaussian input data and exact expressions that completely characterize the second moment of the coefficient vector and algorithm steady-state excess MSE are developed.
Patent
Active noise reduction for audiometry
TL;DR: In this article, active noise reduction (ANR) is incorporated into audiometry testing in a variety of formats, including analog feedback, digital feedback, adaptive feedforward, and adaptive feedback noise control schemes.
Journal ArticleDOI
The stability of variable step-size LMS algorithms
TL;DR: The approach taken here is a generalization of the classical method of analyzing, the exponential stability of the weight covariance equation for LMS, which can be upper bounded by the solution of a linear time-invariant difference equation, after appropriately dealing with certain nonlinear terms.
Patent
Method for tuning an adaptive leaky LMS filter
TL;DR: In this article, a method to automatically and adaptively tune a leaky, normalized least-mean-square (LNLMS) algorithm so as to maximize the stability and noise reduction performance in feedforward adaptive noise cancellation systems was proposed.