Patent
Method for adaptive control and equalization of electroacoustic channels
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TLDR
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.Abstract:
An electroacoustic channel soundfield is altered. An audio signal is applied by an electromechanical transducer to an acoustic space, causing air pressure changes therein. Another audio signal is obtained by a second electromechanical transducer, responsive to air pressure changes in the acoustic space. A transfer function estimate of the electroacoustic channel is established, responsive to the second audio signal and part of the first audio signal. The transfer function estimate is derived to be adaptive to temporal variations in the electroacoustic channel transfer function. Filters are obtained with transfer functions based on the transfer function estimate. Part of the first audio signal is filtered therewith.read more
Citations
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Patent
Anc for bt headphones
TL;DR: In this paper, an active noise cancellation controller for performing noise attenuation in a system over a predetermined frequency range is presented, in which a fixed feedback controller, fixed feedforward controller and adaptive feed-forward controller are arranged to, in use, provide a noise cancellation signal at the output in dependence on a reference signal received at the first input and an error signal received on the second input.
Patent
Oversight control of an adaptive noise canceler in a personal audio device
TL;DR: In this article, an adaptive noise cancellation (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds is presented.
PatentDOI
Portable communication device and a method of processing signals therein
TL;DR: In this article, a portable communication device consisting of a speaker adapted to be held to an ear of a user for conveying sound to the user, at least one sensor for sensing sound emanating from said sound conveyed to the users, and a control unit is disclosed.
Patent
Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices
TL;DR: In this article, an error microphone is provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit through the transducer and adjusts the adaptive cancellation of the ambient sounds to prevent erroneous and possibly disruptive generation of the anti-noise signal if the degree of coupling lies either below or above a range of normal operating ear contact pressure.
Patent
Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
Jeffrey Alderson,Nitin Kwatra,Gautham Devendra Kamath,Ali Abdollahzadeh Milani,John L. Melanson +4 more
TL;DR: In this paper, an error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducers.
References
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Book
Psychoacoustics: Facts and Models
Hugo Fastl,Eberhard Zwicker +1 more
TL;DR: This description of the processing of sound by the human hearing system presents the quantitative relationship between sound stimuli and auditory perceptions in terms of hearing sensations, and implements these relationships in model form.
Journal ArticleDOI
Active noise control: a tutorial review
Sen M. Kuo,Dennis R. Morgan +1 more
TL;DR: The basic adaptive algorithm for ANC is developed and analyzed based on single-channel broad-band feedforward control, then modified for narrow-bandFeedforward and adaptive feedback control, which are expanded to multiple-channel cases.
Journal ArticleDOI
A multiple error LMS algorithm and its application to the active control of sound and vibration
TL;DR: An algorithm is presented to adapt the coefficients of an array of FIR filters, whose outputs are linearly coupled to another array of error detection points, so that the sum of all the mean square error signals is minimized.
Journal ArticleDOI
A delayless subband adaptive filter architecture
Dennis R. Morgan,J.C. Thi +1 more
TL;DR: A new type of subband adaptive filter architecture is presented in which the adaptive weights are computed in subbands, but collectively transformed into an equivalent set of wideband filter coefficients, which avoids signal path delay while retaining the computational and convergence speed advantages of sub band processing.
Proceedings ArticleDOI
Improving transient response of adaptive control systems using multiple models and switching
TL;DR: In this article, the authors developed a stable strategy for improving the transient response, by using multiple models of the plant to be controlled, except for initial estimates of the unknown plant parameters.