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The aim of this research is developing a system that estimates the direction of users by attaching multiple antennas to users. We proposed the method of direction estimation using RSSI of multiple XBees antennas attached to the helmet as a wearable device. In this study, we used a bucket filled with water to simulate the human head and confirmed that direction estimation is sufficiently possible....
The purpose of this research is to develop the real-world captioning system to ensure information accessibility for person with hearing impairment. However, switching the visual line between the speaker's face and the caption when one is engaging in conversation may stress the user. In this paper, we propose the real-world captioning system which display the dialog next to the speaker's face using...
The aim of this research is to develop an auditory guide system using stereophonic techniques and a pair of sounds from ultrasound. In this paper, we tried to improve the accuracy of perceptual directions with the aid of trajectories of sound sources. Through subject experiments, we compared the accuracies of the perceptual directions for static and moving sound sources. As results, the accuracy of...
In this paper, signals for acoustic beacons with M sequence are evaluated with various parameters for self-localization of mobile robot. The effect of (i) baud rate, (ii) carrier frequency and (iii) order of M sequence on DOA estimation error and localization error are evaluated by computer simulation. As a result, localization is possible with same class or more precision compared to the result from...
Individual thermal stress of people in physical training has not been evaluated quantitatively in real time. The main limitations in evaluating individual thermal stress are the difficulties in measuring individual thermal parameters, clothing insulation, and metabolic rate. In this study, we aimed to overcome these limitations with metabolic rate measurement. For calculating metabolic rate in real...
There are a lot of impaired vision people and they are planning physical access by information of positional relationships of auditory cues or by oneself. In this paper, we propose auditory lateralization guide independent of loudspeaker position by using super-directional speaker system for pinpoint presentation and suppressing spread sounds because the individual who do not offer the support would...
The purpose of this paper Is to develop a simplified localization method for indoor navigation with a few system complexity. It is possible to localization more certain precision by a few sensors, and yet that is effective for application to indoor navigation immediately. The distance and the angle from an acoustic marker with a pair of microphones was estimated by measuring the sound-level (SL) and...
The aim of this work is to provide dialogical information for hearing-impaired people. In this paper, we developed a portable caption support system consisting of a see-through head mounted display (HMD), a directional microphone array, and a speech recognition system. For users' convenience, the dialogical information of the person in the front was captioned as a result of the directional characteristic...
The purpose of this paper was to develop a triangular surveying method based on the time of flight between the acoustic beacon and the single microphone with the aim of improving indoor localization services. In the proposed method, plural amplitude modulated signals were applied as the beacon signal to reduce the effect of disturbing noises, and direct conversion receivers were used to cancel the...
The purpose of this research was to develop a system that can detect the voice of victims in noisy disaster sites in order to facilitate more rapid rescues and decrease casualties from disasters. In this paper, the improved Virtual Counter Sound Source (VCSS) method, which is based on the delayed-sum method, was proposed to separate the small sound source immediately. This proposed method reduces...
In this paper, a measurement of the difference between air-conduction and bone-conduction transfer functions was performed. The transfer function was measured by canceling air-conduction and bone-conduction sound each other. The transfer function was measured for 30 kinds of frequencies ranging from 100 Hz to 15 kHz for 6 subjects. From the results, the frequency characteristics of amplitude difference...
In this paper, we evaluated the characteristics of the bone-conducted sound propagation in the human head through computer simulation using a reduced head model with finite element method. The model was made of three spheres, which represent the skin, skull and brain, and the brain was represented by the water for simplicity. The step response of the head was investigated to show that the sound propagation...
Because of the accident of falling out of the bed of inpatients / recipients of care occurs constantly in nursing /care facilities, the technique of roll-over detection / posture state estimation are required. In this paper, we developed the detection technique of roll-over with the thermographic watching system with the respect of a person's privacy The detection of roll-over is the method which...
Compassing the spatial shape is used out of developing surround speaker system or signal enhancement. To reconstruct the boundary positions, conventional methods offer an array consists of a large number of elements (e.g. microphones and loudspeakers). This research aims to estimate the correct boundary position using a small number of microphones, by developing a signal processing method which utilizes...
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