Microphone arrays can be used for high-quality sound pick up in reverberant and noisy environments. The beamforming capabilities of microphone array systems allow highly directional sound capture, providing superior signal-to-noise ratio (SNR) when compared to single microphone performance. There are two aspects in microphone array system performance: The ability of the system to locate and tra...

Breath sound analysis is a useful tool in diagnostics of airway obstruction in pediatric respiratory organs’ pathology. To examine the breath sound various methods of frequency analysis of sound signalsare applied, include Wavelet and Fast Fourier Transform. To develop more sensitive and stable diagnostic technique we proposed a new approach for computing analyzing of pediatric breath sounds: t...

It is essential to supply electrical power continuously to mobile robots to keep moving. We studied how to make a mobile robot return to a recharging station autonomously by using specially designed ultrasonic sensors when a battery is low. A principle to calculate location and rotation angle of a mobile robot from recharging station was suggested. An anisotropic ultrasonic sensor system, we ca...

A simple approach for obstacle detection and collision avoidance of an autonomous flying quadrocopter using low-cost ultrasonic sensors and simple data fusion is presented here. The approach has been implemented and tested in a self-developed quadrocopter (Figure 1) and its evaluation shows the general realizability as well as the drawbacks of this approach. The presented approach is intended t...

Currently, vehicles are often equipped with active safety systems to reduce the risk of accidents, most of which occur in urban environments. The most prominent include Antilock Braking Systems (ABS), Traction Control and Stability Control. All these systems use different kinds of sensors to constantly monitor the conditions of the vehicle, and act in an emergency. In this paper the use of ultr...

Shape recognition of a transparent object is usually difficult to perform by image processing techniques, because the major portion of the light projected onto an object passes through the object. As a result, the object cannot gain the light intensity required for image processing. Ultrasonic sensors are often utilised in situations where such optical sensors cannot be used. Moreover, systems ...

An automated traffic measuring system for use on multiple drive lanes is proposed in this paper. This system, which uses ultrasonic sensors and a lateral scanning method, is suitable for use on real traffic roads. The proposed system can be easily established and maintained in various roadway environments. In addition, the system can be adjusted to measure traffic volumes according to the size ...

Reverberant sound fields are often modeled as isotropic. However, it has been observed that spatial properties change during the decay of the sound field energy, due to non-isotropic attenuation in non-ideal rooms. In this letter, a model for the spatial coherence between two sensors in a decaying reverberant sound field is developed for rectangular rooms. The modeled coherence function depends...

We demonstrate fabric and body-based gestural control of model-based sound synthesis for live musical expression by non-expert as well as trained performers. These softwear instruments are based on customized TinyOS wireless sensor platoforms and our realtime MSP synthesis methods. Our softwear instruments allow freehand, continuous and improvised gesture, and map such continuous gesture to rea...

Wireless sensor networks are computer networks that consist of distributed sensor nodes. These sensors are used to monitor physical or environmental conditions, such as temperature, sound, pressure and others, and pass the information to the main host (server, end point). These networks are subject of active study, and are utilized in such systems like smart houses, security, environmental and ...