Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Cepstrum"”.
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Computation of complex cepstrum.
Thesis. 1978. Elec.E.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Thin-bed resolution from cepstrum analysis
A method of cepstrum analysis is developed for the purpose of resolving thin-beds. The method relies on the detection of periodic pulses of the cepstra of reflectivity functions, which are isolated by computing a sub-cepstrum and a sum-cepstrum, and highlighted with a discriminator, where the …
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Depth information from image sequences using two-dimensional cepstrum
… precisely using a recently developed power cepstrum technique that is more robust and noise tolerant than the usual phase correlation technique. The computation time required by the power cepstrum has been further reduced by using a Hartley-like transform that maps a real-valued sequence to …
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Cepstrum-based deconvolution techniques for ultrasonic pulse-echo imaging of flaws in composite laminates
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 1999.
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Application of the cepstrum technique to location of acoustic sources in the presence of a reflective surface
… an advanced signal processing technique, called Cepstrum analysis. This technique is successfully applied to remove the contaminating effect of echoes in the measured time history. The work described is divided into several steps. A computer program was developed to examine the effects of …
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Processamento digital de sinal: aplicações em acústica e vibrações
… sur la transformée de Fourier rapide, et sur le cepstrum ont été élaborés plusieurs estimateurs de fonctions de correlation, spectre, cepstrum. Les elements d'une chaine d'aquisition de données ont été assemblés dans le but d'utiliser des programmes d'ordinateurs de traitement du signal en …
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Application of cepstrum techniques and a guard tube to the measurement of the normal incident sound power absorption coefficient of road surfaces in-situ
The work described in this thesis was directed towards studying signal processing techniques that could best be incorporated in an apparatus that was to measure the plane wave sound power absorption coefficient of road surfaces in-situ. Road traffic noise has been identified as the greatest noise …
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Road vehicle recognition and classification using magnetic field measurement
… as vehicle features using the representations of cepstrum, frame energy, and gap cepstrum of magnetic signals. There are three directions (X-axis, Y-axis, and Z-axis directions) in the earth’s magnetic field. We design one- (X-axis direction) and three-dimensional (i.e. X-axis, Y-axis, and Z-axis …
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Algorithm-circuit co-design for detecting symptomatic patterns in biological signals
… along with mathematical metrics and Mel "cepstrum" are used to develop an algorithm which can detect generic patterns in biological audio signals. The application of algorithm-circuit co-design methodology helps in practically implementing this system into a low power design. Using …
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Acoustic-based machine learning diagnostic tool for voice disorders
… RNN model. Two novel cepstral features based on cepstrum are proposed: Second Peak Perturbation (SPP) and standard deviation of cepstrum (CepStd). These novels cepstral features are validated to improve the classification performance on three databases. In addition, traditional acoustic analysis …
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Robust speech recognition based on spectro-temporal processing
… Insbesondere die Gabor Merkmale beinhalten das Cepstrum sowie eine rein zeitliche Filterung als Spezialfälle, wobei darüber hinaus auf spektro-temporale Modulationen gezielt wird. Eine datenbasierte Methode zur Merkmalsselektion wird zur Optimierung der Merkmalssätze verwendet. Beide Typen von …
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An intelligent diagnostic system for screening newborns
… of techniques in time-frequency domain such as Cepstrum, Shannon energy, Bispe trum, and Wigner Bispe trum for feature extraction. A comparison of these techniques is considered to feature selection which has been used to reduce the size of the feature vector. In the final step, different lassi …
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Background Noise Reduction in Wind Tunnels using Adaptive Noise Cancellation and Cepstral Echo Removal Techniques for Microphone Array Applications
… to investigate Adaptive Noise Cancelling and Cepstrum echo removal post-processing techniques on acoustic data from a linear microphone array in an anechoic chamber. A point source speaker driven with white noise was used as the primary signal. The first experiment included a background …
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3D echo cancellation in a home environment
… most situations, algorithms based on the complex cepstrum, autocorrelation, and delay and sum methods of echo cancellation were chosen and developed for the study. Many simulation tests were done to determine the behavior of the algorithms under different echo environments. The test signals were …
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A comparison of features for large population speaker identification
… is more resistant to telephone noise than mel-cepstrum as was shown in the previous studies, when now for the first time, it is applied for speaker identification task using the state-of-the-art Gaussian mixture model system.
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Operational modal analysis and model updating with a cyclostationary input
… signal processing and the concept of the cepstrum, the technique identifies the resonances and anti-resonances in the transfer functions between each response and the cyclostationary source. These resonances and antiresonances can be used to regenerate Frequency Response Functions (FRFs) …
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Data proxies, the cognitive layer, and application locality : enablers of cloud-connected vehicles and next-generation internet of things
… A linear SVM using Fourier, Wavelet, and Mel Cepstrum audio features provides 99% accurate engine misfire detection. PCA-transformed Fourier acceleration features and GPS data inform decision trees attaining 91% wheel imbalance and 80% tire pressure and tread depth classification accuracy. …
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Alignement du chant par rapport à une référence audio en temps réel
… Les coefficients évalués sont les Mel-frquency Cepstrum Coefficients (MFCC), les Warped Discrete Cosine Transform Coefficients (WDCTC) et les coefficients de l'analyse Perceptual Linear Prediction (PLP). Les résultats obtenus indiquent une meilleure performance pour l'analyse PLP. L'utilisation …
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Injector Characterisation Measurement Technology for a Production Environment
… this work included a 1D rate tube model, novel cepstrum signal noise and fluid properties analysis, distortion free injection rate signal processing, improved accuracy of temperature to speed of sound signal magnitude calibration, identification of the criteria for the repeatability of thermal …
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Towards the use of sub-band processing in automatic speaker recognition
… complementary to the linear prediction cepstrum coefficients (LPCC). When the scores from a recogniser based on the LP residual are used in conjunction with those from an LPCC recogniser they lead to a drop in the identification error rate.<br/><br/>This concept of combining results from …
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