Patent
Hearing system beamformer
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TLDR
In this article, a beamforming technique is used to provide optimized signals to the user for further increasing the understanding of speech in noisy environments and for reducing user listening fatigue, which is compatible with, and additive to, any microphone directionality or noise cancelling technology.Abstract:
The present invention, generally speaking, picks up a voice or other sound signal of interest and creates a higher voice-to-background-noise ratio in the output signal so that a user enjoys higher intelligibility of the voice signal. In particular, beamforming techniques are used to provide optimized signals to the user for further increasing the understanding of speech in noisy environments and for reducing user listening fatigue. In one embodiment, signal-to-noise performance is optimized even if some of the binaural cues are sacrificed. In this embodiment, an optimum mix ratio or weighting ratio is determined in accordance with the ratio of noise power in the binaural signals. Enhancement circuitry is easily implemented in either analog or digital form and is compatible with existing sound processing methods, e.g., noise reduction algorithms and compression/expansion processing. The sound enhancement approach is compatible with, and additive to, any microphone directionality or noise cancelling technology.read more
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References
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Journal ArticleDOI
Evaluation of an adaptive beamforming method for hearing aids.
TL;DR: Evaluations of a two-microphone adaptive beamforming system for hearing aids show that in environments with relatively little reverberation modifications of the basic Griffiths-Jim algorithm allow good performance even with misaligned arrays and high input target-to-jammer ratios; and performance is better with a broadside array with 7-cm spacing between microphones than with a 26-cm broadside or a 6-cm endfire configuration.
Journal ArticleDOI
Microphone-array hearing aids with binaural output .I. Fixed-processing systems
TL;DR: Results show that both single- and dual-array systems provided target-intelligibility enhancements (2-4 dB improvements in speech reception threshold) relative to binaural cardioid microphones, and the bINAural-output systems provided cues that assist in sound localization, with resulting performance depending directly upon the cue fidelity.
Journal ArticleDOI
Microphone-array hearing aids with binaural output. II. A two-microphone adaptive system
TL;DR: A design in which two ear-level omnidirectional microphones constitute the array showed improvements in speech reception in noise in a mildly reverberant room of approximately 3 dB over simple binaural amplification and 5 dB over monaural amplification.
Patent
Apparatus for and method of filtering in an digital hearing aid, including an application specific integrated circuit and a programmable digital signal processor
TL;DR: In this article, the authors proposed a compromise between the conflicting goals of size, re-programmability and power consumption of a hearing aid and a programmable digital signal processor.
Journal ArticleDOI
Modified LMS algorithms for speech processing with an adaptive noise canceller
TL;DR: In this paper, two modified least mean squares (LMS) algorithms, the weighted sum and sum methods, were proposed to solve the problem by reducing the size of the steps in the weight update equation when the desired signal is strong.