Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Patrik Paajarvi"'
Publikováno v:
IEEE Transactions on Signal Processing. 64:1586-1596
Maximizing the skewness of a measured signal by adaptive filtering to reveal hidden periodic impulses is proposed as a preprocessing method. Periodic impulsive signals are modeled by harmonically related sinusoids to prove that amplitude and phase di
Publikováno v:
2017 IEEE International Ultrasonics Symposium (IUS).
When investigating thin materials with pulse echo ultrasound, multiple reflections (reverberations) from the layer(s) will overlap. It is therefore difficult to deduce information about speed of sound, thickness, density, etc. from the raw data. In o
Publikováno v:
2016 IEEE International Ultrasonics Symposium (IUS).
Pulse compression on overlapping echoes without knowledge of the pulse shape, transducer and propagation path impulse response is examined to provide valuable information about the sample structure in ultrasonic testing. A comparison against previous
Autor:
James P. LeBlanc, Patrik Paajarvi
Publikováno v:
IEEE Transactions on Wireless Communications. 9:1298-1302
A novel blind equalization strategy for pulse position modulation (PPM) based on maximizing the third-order moment of the equalizer output is presented. Compared to traditional fourth-order (e.g. kurtosis-based) methods, third-order moments give fast
Autor:
Philip Lindblad, Biao Jiang, Patrik Paajarvi, Miguel Castaño Arranz, Johan E. Carlson, Aziz Kubilay Ovacikli
Publikováno v:
2015 IEEE International Ultrasonics Symposium (IUS).
Enhancement of material impulse response buried in reverberating ultrasonic echoes from thin layered materials can be exploited in order to be able to detect possible flaws. One of the methods presented in this study is to enhance the impulse respons
Publikováno v:
ISPA
The scale invariant third order moment, skewness, is analysed as an objective function to an adaptive gradient ascent algorithm. The purpose is to achieve a spectrum at the filter output that can enable identification of possible bearing defect signa