The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We describe a time-of-arrival-(ToA-) based localization system for smartphones. In this system, the transmitter emits modulated light-emitting diode (LED) light and sound waves, then the smartphone catches them. The smartphone measures the time of flight of sound waves and localizes its position using multilateration. The LED light is used for visible light communication, which also conveys the time...
This paper presents a rapid and accurate time-synchronization technique using an LED and an off-the-shelf camera. We discuss optimally modulated illumination as a function of camera exposure time through theoretical analysis and derive its mathematical representation. Experiments in real environments with a single LED and 60 fps camera show that the proposed technique can achieve time synchronization...
With a goal of advancing human-machine collaboration, we propose a method to recognize a laughing voice. A previous study that proposed a laughing voice recognition method was based on the periodic waveform feature of the laughing voice. However, identifying laughing voices from waveforms is problematic, because this can result in false positive results. To overcome this problem, we propose a laughing...
Many collision accidents between operators and machine tools are reported. However, no effective way of preventing these accidents has been proposed to date. Therefore, the authors propose the implementation of a danger decision by measuring the human posture and face direction. By performing a danger decision, the authors aim to realize the effective prevention of collision accidents. The posture...
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...
This paper proposes a method for separating the voice of a signal person from the voices of multiple speakers' in a mixed recording. When the sounds of multiple speakers are present when a voice recognition system is operating, the quality of speech recognition decreases. The proposed method separates the sound of multiple speakers using signal processing techniques and a microphone array. The position...
Interest in sound interfaces is increasing because such interfaces do not need advanced knowledge about particular devices, nor do they require physical operation. However, such interfaces are difficult to use because the general living environment often contains background noise. In order to solve this problem, sound separation systems that use a microphone array sensor have been proposed. In previous...
Development of a robust and precise voice interface could accelerate the realization of a learning support system that utilizes voice. In our research, this objective is called Intelligent Interactive Design of learning support. In order to realize Intelligent Interactive Design, we propose a “voice separation and recognition system” that aims at clear voice separation for robust voice recognition...
In this study, we estimate gaze direction using the relationship between the face and eyes. The face and eyes are divided laterally and in lengthwise direction. We set up an object laterally and in lengthwise direction and measured the face angle using a Kinect sensor, which is range image sensor, when gazing at an object. The angle of the eyes is fixed at the angle of the object and grasp of the...
This paper presents a system to support learning within museum for children as a novel application of Kinect based human sensing system. The system measures the physical movement of the learner using a Kinect sensor, and provides a sense of immersion in the paleontological environment by adapting the surroundings according to these movements. As the first stage of this project, we have developed a...
In this paper, the relationship between visual attention and eye blinking is described. In our experiment, we observed blinking when a subject performed a task. We determined that the subject's visual attention functions during the task by electrodermal activity. Experimental results showed that blink rate decreased when the subject's visual attention was engaged. On the other hand, blink rate increased...
In this paper we describe SyncSync, a novel time-of-arrival (ToA) localization method for smartphones. ToA measurements generally show better precision than time-difference-of-arrival measurements, but ToA systems require a synchronization mechanism between anchor and mobile nodes. For this synchronization, we employ modulated light with an acoustic signal for the time-of-flight distance measurement...
This paper presents a rapid and accurate time-synchronization technique for acoustic localization. Two LED arrays for modulated illumination and an off-the-shelf camera are used. An equation that specifies the time difference between them accurately and precisely is proposed. Experiments in real environments show that the proposed technique using rectangular signals can achieve time synchronization...
In this paper, we propose a rapid motion retrieval technique using dynamic time warping. The frames of the motions are represented by feature vectors whose elements are integer values. The dimensionality of the feature vectors is reduced by using principal component analysis and the values of vector elements are quantized to two bits. A similarity matrix giving distances between the frames is generated...
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...
The authors are developing a novel learning support system "Human SUGOROKU" by integration of ultrasonic sensors and Kinect sensors. The system is a relocatable large scale digital board game that human-players as its piece move on squares. To realize the system, we measure players locations and gestures identifying players, by integrating output information from both sensors. This paper...
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...
This paper presents a novel motion concatenation method for parametric motion synthesis techniques. First, motion groups are created based on the actions in each motion. We then extract all of the parameters that control the synthesized motions. To connect the motion groups, we propose a motion concatenation algorithm based on cubic Bézier interpolation that can be used to connect any pair of motions...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.