The Prism is a new signal processing module which implements fully recursive, linear phase FIR filtering, so its computational cost fixed irrespective of filter length. also has negligible design cost. Recent work demonstrated how, using simple rules, chain six Prisms can create narrowband with arbitrary central frequency and bandwidth. In this paper, the technique applied to spectral analysis ...

Cardiac auscultation is the examination of heart by listening to sound produced through a stethoscope. Heart sounds can provide information about functioning valve condition as well structural abnormalities heart. However, it needs intensive training for mastering. The objective work was develop an algorithm signal classification applied computer-assisted digital in order identify pathological ...

Acoustic emission (AE) is one of the most recent entries into the field of nondestructive evaluation. Due to the uniqueness of the basic principle and the potential for tackling a wide range of applications, the technique has gone through rapid strides in a very short time. Thus, today, two decades after the first application of the technique, AE is used in various industries, such as petro-che...

This paper concerns the issue of wavelet analysis of signals by continuous and discrete wavelet transforms (CWT – Continous Wavelet Transform, DWT – Discrete Wavelet Transform). The main goal of our work was to develop a program which, through the CWT and the DWT analyses, would obtain graph of time-scale changes and would transform it into the spectrum, that is a graph of frequency changes. In...