This paper introduces new adaptive beamforming methods for nonstationary noise reduction, designed to be robust against broadband interfering signals. In particular, we propose combined beamforming schemes within a standard adaptive beamforming system, such as the generalized sidelobe canceller (GSC). The novelty of such combined adaptive beamformers relies on the use of different adaptive side...

Noise reduction algorithms in hearing aids are crucial to improve speech understanding in background noise for hearing impaired persons. For binaural hearing aids, algorithms that exploit the microphone signals from both the left and the right hearing aid are considered to be promising techniques for noise reduction, because in addition to spectral information spatial information can be exploit...

background: noise is one of the most important harmful agents in work environment. noise pollution in oil refinery industries is related to workers' health. this study aimed to determine the overall noise pollution of an oil refinery operation and its frequency analysis to determine the control plan for a vent noise in these industries. methods: this experimental study performed in control unit...

Introduction: BOLD fMRI achieves excellent spatial localization of brain activity, however the latency and longevity of the haemodynamic response means that fMRI suffers from poor temporal resolution. Conversely, electroencephalography (EEG) directly measures the electrical potentials generated by neuronal activity, and therefore offers excellent temporal resolution, but the ill-posed EEG inver...

This contribution is devoted to the noise suppression system for monoaural SPEAK-type cochlear implants. The system is based on the combination of the superdirective two-microphone array and the noise suppression post-processing, both implemented in the frequency domain. The relative insensitivity of the two-microphone superdirective system to the spectral magnitude di erences in both channels ...

Two main tasks of image processing are noise filtering and image enhancement.During image acquisition and transmission the images are corrupted by noise.these noise will affect the performance of image processing mehods,herefore to improve the performance efficient denoising technique is necessary for image processing methods.In this paper the performance of combined filter in impulse denoising...

Collinear coherent combination of multiple single frequency fiber amplifiers is a promising approach to realize the high power laser sources required for 3rd generation gravitational wave detectors (GWD), as long as the stringent requirements on the beam quality and noise properties can be met. Here, we report the beam quality and noise properties of two coherently combined 10 W single frequenc...

For the first time to our knowledge, the noise performance of a frequency nondegenerate phase-sensitive amplifier (PSA) with unequalized input powers has been experimentally characterized, based on a fiber-based parametric copier-PSA scheme. Two different noise-figure (NF) definitions-separate and combined NFs-are provided and compared. The results show that the separate NF of the weaker input ...

We show that intensity and phase noise are highly correlated in a mode-locked Ti:sapphire laser. This allows electro-optic sampling noise, degraded by the combination of 2184 dBc/Hz laser phase noise and birefringent system components, to be reduced 12 dB to the shot noise floor. Two multiorder waveplates can be combined to achieve shot-limited noise while preserving maximum detection efficienc...

Blind voice separation refers to retrieve a set of independent sources combined by an unknown destructive system. The proposed separation procedure is based on processing of the observed sources without having any information about the combinational model or statistics of the source signals. Also, the number of combined sources is usually predefined and it is difficult to estimate based on the ...