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A method for constructing deep neural networks (DNNs) for accurate supervised source enhancement is proposed. Attempts were made in previous studies to estimate the power spectral densities (PSDs) of sound sources, which are used to estimate Wiener filters for source enhancement, from the output of multiple beamformings using DNNs. Although performance improved, it was not possible to guarantee accurate...
We propose a noise-suppressing microphone array using power spectrum density (PSD) estimation. The microphones of the proposed microphone array achieve over 22 dB higher signal-to-noise ratio on average than other commercial microphones. This microphone array is useful for voice communication and voice recognition in highly noisy environments such as factories and construction sites.
The Wiener filter has been used as a post-filter applied to the output of beamforming, which boosts the overall performance of sound source enhancement. Since the power spectral density (PSD) of each sound source needs to be estimated to derive the Wiener filter, a previous study attempted to estimate source PSDs from the output signals of multiple beamformings using linear approximation realized...
Microphone array Wiener filtering has been studied for practical sound source enhancement in noisy environments. In our previous work, the power spectral density (PSD)-estimation-in-beamspace method was proposed for estimating PSDs of target sources and surrounding noises. Assuming that source signals are uncorrelated with each other, the relationships among the PSDs of multiple beamforming outputs...
We propose a method for estimating the prior signal-to-noise ratio (SNR), which is used for calculating the Wiener filter for distant sound source extraction, from output signals of beamforming using statistical mapping based on the deep neural network (DNN). Since informative features to estimate the prior SNR are included in multiple beamforming outputs, the SNR can be accurately estimated by this...
The influence of morphine (MOR) on the pharmacokinetics and toxicity of repeated etoposide (ETP) oral administration was evaluated in rats. A decrease in the number of leukocytes in blood was observed by 5 days of treatment with ETP (30 mg/kg/day), which was prolonged by oral MOR coadministration (30 mg/kg/day). Furthermore, MOR significantly decreased animal viability. During the dosing period, the...
Tendon-driven systems are one of efficient methods to downsize robots. This paper discusses application of tension control into a joint using cable differential. Cable differential is mechanism which allows two-degrees of freedom (DOF) in one joint. Controllers for the cable differential-driven joint are proposed in the paper. The joint is actuated by four linear motors. The controllers are designed...
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