The automatic assignment of anchoring points is proposed to define the correspondence between the timefrequency representations of speech samples for speech morphing, speech texture mapping, and so on. The correspondence is modeled as a set of segmental bilinear function. These model parameters are called anchoring points. Although, the correspondence significantly affects the quality of such m...

The Short-Time Fourier Transform is the most popular timefrequency analysis tool applied in speech processing. This transform delivers fair quality analysis for periodic signals, but, since speech is quasi-periodic, the transform suffers from blurry harmonic representation when voiced speech undergoes changes in pitch. This frequency variation could be relative high in comparison with the analy...

In this paper, we present an overlapped channel transmission (OCT) multiple access scheme which increases the uplink capacity of the slow FHMA systems. By using antenna arrays techniques, subscribers can transmit data through timefrequency overlapped slots and the proposed system increases the spectrum efficiency. A practical system that uses 2-fold OCT to increase system capacities with the sa...

In this paper, the usage of pseudo 2-dimensional Hidden Markov Models for speech recognition is discussed. This image processing method should better model the timefrequency structure in speech signals. The method calculates the emission probability of a standard HMM by embedded HMMs for each state. If a temporal sequence of spectral vectors is imagined as a spectrogram, this leads to a 2-dimen...

An example of application of the wavelet transform to electrocardiography is described in the paper. The transform is exploited as a first stage of an ECG signal compression algorithm. The signal is decomposed into particular timefrequency components. Some of the components are removed because of their low influence to signal shape due to nonstationary character of ECG. Resulted components are ...

In this study, we proposed a joint time-frequency distribution of suppressing cross-terms aiming at cross-terms interference of Wigner-Ville distribution. According to the analyzed signal, the Wigner-Ville distribution and Smooth Pseudo Wigner-Ville distribution can be obtained. Moreover, the prototype of timefrequency distribution can be obtained by non-linear filter for Smooth Pseudo Wigner-V...

A multitone tracker is described using two basic principles in optimum frequency estimation, namely: Processing bandwidth depending on the distance from the estimate to the actual frequency values; and, parallel estimates with inhibitory paths to ensure orthogonality between the enhanced tones. The first feature is provided by Extended Kalman Filters (EKF), and the second one is achieved by hig...

We apply a local cross-correlation method to the study of correlating brake sounds perceived inside a car to the vibration produced by the brakes at the source. The method allows one to correlate the time-varying spectral properties of two vibration or acoustic sources. The aim is to identify the possible objectionable sounds by determining the time-varying frequencies that the two sounds have ...

We present a flexible dual channel noise reduction algorithm that combines the information of two microphone channels in the discrete Fourier transform domain. This algorithm can cope with substantially different signal-to-noise ratios at different timefrequency bins in both channels. The output is obtained by combining the outputs of two single channel filters and a dual channel filter weighte...

In this paper, we present the survey on MMSE Detector using space time diversity technique. The fulldiversity spacefrequency block codes (SFBCs) focused around orthogonal space-time block codes (OSTBCs). We studied that the Space Time Diversity Technique is fit for achieving full-differing qualities and rate-one attributes for two transmit reception apparatuses, despite the fact that the eviden...