Essays about: "short time Fourier transform"

Showing result 21 - 25 of 25 essays containing the words short time Fourier transform.

  1. 21. Nonstationary feature extraction techniques for automatic classification of impact acoustic signals

    University essay from Datateknik

    Author : Yasemi Bekiroglu; [2008]
    Keywords : railway sleepers;

    Abstract : Condition monitoring of wooden railway sleepers applications are generallycarried out by visual inspection and if necessary some impact acoustic examination iscarried out intuitively by skilled personnel. In this work, a pattern recognition solutionhas been proposed to automate the process for the achievement of robust results. READ MORE

  3. 22. BLIND SOURCE SEPARATION USING FREQUENCY DOMAIN INDEPENDENT COMPONENT ANALYSIS

    University essay from Blekinge Tekniska Högskola/Avdelningen för signalbehandling

    Author : Okwelume Gozie E.; Ezeude Anayo Kingsley; [2007]
    Keywords : Independent Component Analysis; Blind Source Seperation; Fourier Transform; Short Time Fourier Transform;

    Abstract : Our thesis work focuses on Frequency-domain Blind Source Separation (BSS) in which the received mixed signals are converted into the frequency domain and Independent Component Analysis (ICA) is applied to instantaneous mixtures at each frequency bin. Computational complexity is also reduced by using this method. READ MORE

  4. 23. Spectrogram Evaluation of Seismic Risk in Managua, Nicaragua

    University essay from Lunds universitet/Teknisk geologi

    Author : Jonas Hedberg; [2005]
    Keywords : Stratigrafi; Stratigraphy; Tektonik; Paleontologi; Palaeontology; geologi; jordbävningar; Geology; MFS; ASDI; SIDA; UNAN; CIGEO; Natural disasters; Frequency analysis; In-situ testing; Geophysical surveying; Geophysics; Soil; Sediment; Surface layers; Dynamic properties; Nakamura; Impedance; Damping; Attenuation; Resonance; Elastic rebound; Faults; Tectonics; Short-term Fourier transform; Earthquake-sensitivity; Local risk; Vulnerability; Time-frequenzy hazard analysis; Spectrogram; Traffic impulse response; Nicaragua; Site response; Managua; Earthquakes; Sedimentology; Sedimentologi; Hydrogeology; geographical and geological engineering; Hydrogeologi; teknisk geologi; teknisk geografi; physical oceanography; meteorology; Geofysik; fysisk oceanografi; meteorologi; Physical geography; geomorphology; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi; Earth and Environmental Sciences;

    Abstract : Managua has experienced two devastating earthquakes during the last century resulting in major human loss. The destruction in the earthquake of 1972 was particularly severe in defined areas of the city, including the former city centre, which is now unused terrain. READ MORE

  5. 24. A Survey on Methods for Time-Frequency Analysis

    University essay from Blekinge Tekniska Högskola/Institutionen för signalbehandling

    Author : Jan Mark de Haan; [1998]
    Keywords : Signal processing; Time-frequency analysis; Wavelets; Wavelet Packets;

    Abstract : Time analysis and frequency analysis are both well-established ways in engineering to gain more knowledge about a physical phenomena. Time and frequncy analysis can be combinen in a joint time and frequency distribution. READ MORE

  6. 25. A Survey on Methods for Time-Frequency Analysis

    University essay from Blekinge Tekniska Högskola/Institutionen för signalbehandling

    Author : Jan Mark de Haan; [1998]
    Keywords : Signal processing; Time-frequency analysis; Wavelets; Wavelet Packets;

    Abstract : Time analysis and frequency analysis are both well-established ways in engineering to gain more knowledge about a physical phenomena. Time and frequncy analysis can be combinen in a joint time and frequency distribution. READ MORE