Abstract We prove that there exists no window function $$g \in {L^2(\mathbb {R})}$$ g ∈ L 2 ( R ) and lattice $${\mathcal {L}} \subset \mathbb {R}^2$$ ⊂</...

The background of this research is to review the interests second-level students Societas Maria Montfortana (SMM) congregation when visiting Widya Sasana School Philosophy Theology (STFT) library. goal be achieved find out what extent SMM have an interest in STFT second year was seen based on frequency method used here a quantitative form ordinal questionnaire given congregation. This technique...

In this paper we describe a system that suppresses the acoustic interference due to the coupling between the microphone and the loudspeakers of a hands-free multi-channel desktop audio system. The proposed system operates in the Short-Time Fourier Transform domain and uses spectral subtraction to suppress the unwanted interference, which consists of the local audio and the remote speech signal ...

In this paper, a new adaptive Fourier decomposition (AFD) based time-frequency speech analysis approach is proposed. Given the fact that the fundamental frequency of speech signals often undergo fluctuation, the classical short-time Fourier transform (STFT) based spectrogram analysis suffers from the difficulty of window size selection. AFD is a newly developed signal decomposition theory. It i...

We introduce a novel Algorithm for underdetermined convolutive mixture of source signals. Where the convolution is routinely approximated in the short-time Fourier transform (STFT) domain as linear instantaneous mixing in each frequency band. Each source STFT is given a model inspired from nonnegative matrix factorization (NMF) with the -divergence, this divergence is a family of cost functions...

The use of solid state devices and equipments are increasing rapidly in electrical systems. Some of these solid state components introduce harmonics in the system. As a result the signals in electrical systems deviate from being a pure sinusoidal one. Quite often signals become very complex and their equations are unknown. Analysis of these complex signals is mainly accomplished using various k...

Spectral decomposition is an important tool for analysis of seismic data.This paper deals with the time-frequency analysis of non-stationary signals.Time-frequency method is a primary tool to analyze the evolving spectra of non-stationary signals. Short Time Fourier Transform (STFT) is a fundamental time-frequency method which reveals the frequency contents of the signal at each time point. The...

This paper presents a new approach in the detection, localization, and classification of frequency and amplitude changes in nonstationary signal waveforms using a variable window shorttime Fourier Transform (STFT) known as ST in short and an Extended Complex Kalman Filter (CEKF). Unlike the fixed window STFT, the variable window Short-time Fourier Transform has excellent time-frequency resoluti...

Abstract Ballast fouling in railroad substructure is detrimental to railroad track effectiveness and its structural capacity. Ground penetrating radar (GPR) provides a rapid, effective and continuous approach to assess railroad substructure condition. However, unknown ballast dielectric constant and unclear interface between clean and fouled ballast limit the GPR assessment accuracy. In this st...

Date of publication: 12 February 2015 ith the advancement of technology, both assisted listening devices and speech communication devices are becoming more portable and also more frequently used. As a consequence, users of devices such as hearing aids, cochlear implants, and mobile telephones, expect their devices to work robustly anywhere and at any time. This holds in particular for challengi...