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This paper describes a spot-controllable data-transfer method. The proposed method generates a beam-shaped spot using two commercial off-the-shelf speakers. In our method, a symbol consists of a pair of sinusoidal waves having different angular frequencies. The width and direction of a beam-shaped spot are controlled by the angular-frequency difference between the sinusoidal waves and the transmission-time...
We developed a sound separation system that uses a microphone array to separate children's voices from background noise in general living environments. Our focus in the development of this system is on “a clear separation of the human voice” so that it will be easy for children to use. Evaluations conducted of sound separation performance in previous research have not always measured how easily listeners...
We describe a novel time-synchronization technique for mobile smart nodes. We capture modulated LED light with a video camera, which is usually built into a smart node. The CMOS image sensor of a video camera does not take a snapshot at a certain time. Instead, the sensor captures data on a line-byline basis and the sensor output consists of lines taken at slightly different times. Therefore, we can...
This paper presents a spherical microphone array design which can be used for capturing a sound selectivity and locally. Capturing a sound by microphone array is achieved by method of Delay and Sum Beam Forming (DSBF). In this method, microphone arrangement has a large effect on the directivity. Using beam forming simulation, the authors investigated on the optimal arrangement of concentrically spherical...
In recent years, microphone array signal processing has been actively studied in the field of engineering. In consideration of our hope that children's interest in this technology will contribute to the future development of science and technology, we have developed the KIKIWAKE system with a microphone array and conducted the Prince Shotoku Game to promote children's interest. Then, we confirmed...
In airborne acoustic imaging the synthetic transmit aperture (STA) technology is widely used to improve the lateral resolution limited by the aperture of the microphone array. As for an STA system we use multiple speakers in combination as well as the receiver array, knowing the exact radiation pattern of a speaker is the key factor to properly operate the synthesis system. The ultrasonic signals...
We propose a new technique for acoustic imaging that employs the back projection algorithm to process signals from a static ultrasonic microphone array. To obtain a projection data of a target, we integrate the time distribution of received signal powers gained by pulse compression with the Radon transform of a sound field in the spherical polar coordinates. In case of 2D imaging, the proposed method...
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