Internetbaserade insamling och behandling av data
AbstractAim of this project was to analyse signals and try to localize the position of source of sound. It is donewith three microphones which have 90 degrees angle to each other. Each microphone detects one partof the sound wave. The microphones are connected toan ADC which turns signals from analogue todigital shape. After that the three signals are transformed to a computer. As known a computerreceives only digital signals which are the main reason to use the ADC. The signals are analysed bycomputer with help of special softwares. These softwares are LabVIEW and MATLAB which are usedin this work. This analysis of the signals is divided in two parts. The first part is the FFT-analyse (FastFourier Transform) of the signal from the microphones. It means that the signals frequency?s domainis showed, in other word it shows which frequency components a signal has. Then the result is showedonline by a function belonging to LabVIEW which is called Web Publish.In second part the position of the signal source is determined by cross correlation. The position isdetermined by the difference of time between two signals from same source which are measured bycross correlation and you can determine angle by triangulating which is described in report.