A theory of frames that extend Gabor analysis by including chirping is discussed. The chirping parameter in thesètime-frequency localization frames' depends on time and/or frequency shift parameters that can be adapted to analyze and detect chirps in noisy signals. Radar/sonar applications are outlined. The frame theory is motivated by a generalized notion of square-integrable group representat...

In this paper, an acoustic event detection system is proposed. It consists of a noise reduction signal enhancement step based on the noise power spectral density estimator proposed in [1] and on the noise suppression by [2], a Gabor filterbank feature extraction stage and a two layer hidden Markov model as back-end classifier. Optimization on the development set yields up to a F-Score of 0.73 o...

Rapid increase in the amount of audio data and especially music collections demand an efficient method to automatically retrieve audio objects based on its content. In this paper, based on the Gabor wavelet features, we will propose a method for content-based retrieval of perceptually similar music pieces in audio documents. It allows the user to select a reference passage within an audio file ...

A multicarrier signal can be synthesized thanks to a symbol sequence and a Gabor family (i.e., a regularly time–frequency shifted version of a generator pulse). In this article, we consider the case where the signaling density is increased such that inter-pulse interference is unavoidable. Over an additive white Gaussian noise channel, we show that the signal-to-interference-plus-noise ratio is...

Abstract. The time-frequency analysis of a signal is often performed via a series expansion arising from well-localized building blocks. Typically, the building blocks are based on frames having either Gabor or wavelet structure. In order to calculate the coefficients in the series expansion, a dual frame is needed. The purpose of the present paper is to provide constructions of dual pairs of f...

Nonstationary processes in seismic modeling may be represented numerically by Gabor multipliers and generalized frame operators. These numerical algorithms are based on a localized version of the Fourier transform and share many of the speed and accuracy benefits of the FFT, while modeling nonstationarity. We demonstrate applications to seismic deconvolution and numerical wavefield propagation,...

A multicarrier signal can be seen as a Gabor family whose coefficients are the symbols to be transmitted and whose generators are the time-frequency shifted pulse shapes to be used. In this article, we consider the case where the signaling density is increased such that interpulse interference is unavoidable. Such an interference is minimized when the Gabor family used is a tight frame. We show...

We have reported CNN implementations of 1D and 2D focal plane architectures for filtering images with odd and even symmetric orientation selective filters similar to Gabor filters. These implementations used transistor circuits operating above threshold. While these implementations are fast, they also require a large amount of power. Since many applications may not require extremely fast frame ...

0167-8655/$ see front matter 2011 Elsevier B.V. A doi:10.1016/j.patrec.2011.08.014 ⇑ Corresponding author. Tel.: +86 024 83671318. E-mail address: [email protected] (X. Z In this paper, we present a noisy iris recognition frame which is learned by Adaboost on a 2D Gabor-based feature set. First, the irises are segmented and normalized by rubber sheet or simplified rubber sheet according ...