Patent
Normalized frequency domain LMS adaptive filter
TLDR
In this article, a normalized frequency domain Least Means Square filter is proposed, where the power estimate is incorporated directly into the filter algorithm as a data-dependent, time-varying stochastic feedback coefficient.Abstract:
A normalized frequency domain Least Means Square filter. The feedback coefficient for each frequency bin is adjusted separately in the filter by use of an input power estimate. The power estimate is incorporated directly into the filter algorithm as a data-dependent, time-varying stochastic feedback coefficient. The filter is particularly useful in applications in which the input signal has large spectral variations, which could lead to filter instabilities in some frequency bins if a single feedback coefficient were employed in all frequency bins.read more
Citations
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Patent
Active control of noise and vibration
TL;DR: An active system for controlling vibration or sound includes a method for limiting the output gain G from a gradient descent algorithm, such as an LMS algorithm, according to the relationship ##EQU1## and reducing one of first and second filter weights W1 and W0 such that the output canceling signal is never saturated.
PatentDOI
Hearing aid device incorporating signal processing techniques
TL;DR: In this paper, a hearing compensation system for the hearing impaired comprises a plurality of bandpass filters having an input connected to an input transducer and each bandpass filter having an output connected to the input of one of a multiplicative AGC circuits.
PatentDOI
Feedback cancellation improvements
James M. Kates,John L. Melanson +1 more
TL;DR: In this article, a cascade of two filters along with a short bulk delay is used to adjust the filter response to make the most effective use of the limited number of filter coefficients.
Patent
Periodic signal enhancement system
TL;DR: In this paper, the authors proposed a signal enhancement system that includes delay logic, a partitioned adaptive filter, and signal reinforcement logic to improve the understandability of speech or other audio signals.
PatentDOI
Subband acoustic feedback cancellation in hearing aids
TL;DR: In this paper, a cascade of two narrow-band filters Ai(Z) and Bi(Zng) with a fixed delay is proposed to represent the feedback path in each subband.
References
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Journal ArticleDOI
Adaptive filtering in the frequency domain
TL;DR: Adaptive filtering in the frequency domain can be accomplished by Fourier transformation of the input signal and independent weighting of the contents of each frequency bin this article, which performs similarly to a conventional adaptive transversal filter but promises a significant reduction in computation when the number of weights equals or exceeds 16.
Journal ArticleDOI
Block implementation of adaptive digital filters
TL;DR: A block adaptive filtering procedure in which the filter coefficients are adjusted once per each output block in accordance with a generalized least mean-square (LMS) algorithm shows that it permits fast implementations while maintaining performance equivalent to that of the widely used LMS adaptive filter.
PatentDOI
Adaptive noise suppressor
TL;DR: An adaptive noise suppressor for providing noise filtered signals as discussed by the authors employs a vector gain μ for the weights of the filter wherein the vector μ is selected for each frequency bin to be inversely proportional to the power spectrum.
Patent
Two-input crosstalk-resistant adaptive noise canceller
TL;DR: In this paper, a two-input crosstalk-resistant adaptive noise canceller with first and second-summer means was proposed, where the first summer means provides a canceller output signal which is the difference between the primary input signal and the first adaptive filter output signal.