Now showing items 1-17 of 17

    • Capacity analysis of a PMR system with DAB downlink 

      Sengul, E.; Can, B.; Akar, N.; Ider, Y.Z.; Koymen H. (2003)
      Several trunked private mobile radio (PMR) systems have been designed over the last decade, most of which have symmetric downlink and uplink channel capacities. These systems may not be spectrally efficient in case of group ...
    • Classification of closed-and open-shell pistachio nuts using voice-recognition technology 

      Cetin, A. E.; Pearson, T. C.; Tewfik, A. H. (American Society of Agricultural and Biological Engineers, 2004)
      An algorithm using speech recognition technology was developed to distinguish pistachio nuts with closed shells from those with open shells. It was observed that upon impact with a steel plate, nuts with closed shells emit ...
    • Finding people frequently appearing in news 

      Ozkan, D.; Duygulu, P. (Springer, 2006)
      We propose a graph based method to improve the performance of person queries in large news video collections. The method benefits from the multi-modal structure of videos and integrates text and face information. Using the ...
    • Interframe differential vector coding of line spectrum frequencies 

      Erzin, E.; Çetin, A. E. (Institute of Electrical and Electronics Engineers, 1993)
      Line Spectrum Frequencies (LSF's) uniquely represent the Linear Predictive Coding (LPC) filter of a speech frame. In many vocoders LSF's are used to encode the LPC parameters. In this paper, an interframe differential ...
    • Large vocabulary speech recognition in noisy environments 

      Jabloun, Firas (Bilkent University, 1998)
      A ІКПѴ set of speech feature parameters based on multirate subband analysis and the Teager Energy Operator (TEO) is developed. The speech signal is first divided into nonuniform subbands in mel-scale using a multirate ...
    • Line spectral frequency representation of subbands for speech recognition 

      Erzin, E.; Çetin, A.E. (1995)
      In this paper, a new set of speech feature parameters is constructed from subband analysis based Line Spectral Frequencies (LSFs). The speech signal is divided into several subbands and the resulting subsignals are represented ...
    • Mel-cepstral methods for image feature extraction 

      Çakir, S.; ÇEtin, A.E. (2010)
      A feature extraction method based on two-dimensional (2D) mel-cepstrum is introduced. The concept of one-dimensional (1D) mel-cepstrum which is widely used in speech recognition is extended to 2D in this article. Feature ...
    • New methods for robust speech recognition 

      Erzin, Engin (Bilkent University, 1995)
      New methods of feature extraction, end-point detection and speech enhcincement are developed for a robust speech recognition system. The methods of feature extraction and end-point detection are based on wavelet analysis ...
    • Object tracking under illumination variations using 2D-cepstrum characteristics of the target 

      Cogun F.; Cetin, A.E. (2010)
      Most video processing applications require object tracking as it is the base operation for real-time implementations such as surveillance, monitoring and video compression. Therefore, accurate tracking of an object under ...
    • Prefix-suffix based statistical language models of Turkish 

      Topkara, Umut (Bilkent University, 2001-07)
    • Recognition of vessel acoustic signatures using non-linear teager energy based features 

      Can, G.; Akbas, C. E.; Cetin, A. E. (Institute of Electrical and Electronics Engineers Inc., 2016)
      This paper proposes a vessel recognition and classification system based on vessel acoustic signatures. Teager Energy Operator (TEO) based Mel Frequency Cepstral Coefficients (MFCC) are used for the first time in Underwater ...
    • Recognizing objects and scenes in news videos 

      Baştan, M.; Duygulu P. (Springer Verlag, 2006)
      We propose a new approach to recognize objects and scenes in news videos motivated by the availability of large video collections. This approach considers the recognition problem as the translation of visual elements to ...
    • Subband analysis for robust speech recognition in the presence of car noise 

      Çetin, A. E.; Yardımcı, Y.; Erzin, E. (IEEE (Institute of Electrical and Electronics Engineers), 1995)
      In this paper, a new set of speech feature representations for robust speech recognition in the presence of car noise are proposed. These parameters are based on subband analysis of the speech signal. Line Spectral Frequency ...
    • Teager energy based feature parameters for robust speech recognition in car noise 

      Jabloun, F.; Çetin, A. E. (IEEE, Piscataway, NJ, United States, 1999)
      In this paper, a new set of speech feature parameters based on multirate signal processing and the Teager Energy Operator is developed. The speech signal is first divided into nonuniform subbands in mel-scale using a ...
    • Teager energy based feature parameters for speech recognition in car noise 

      Jabloun, F.; Çetin, A. E.; Erzin, E. (Institute of Electrical and Electronics Engineers, 1999-10)
      In this letter, a new set of speech feature parameters based on multirate signal processing and the Teager energy operator is introduced. The speech signal is first divided into nonuniform subbands in mel-scale using a ...
    • Time-scale wavelet scattering using hyperbolic tangent function for vessel sound classification 

      Can, G.; Akbas, C. E.; Cetin, A. E. (Institute of Electrical and Electronics Engineers Inc., 2017)
      We introduce a time-frequency scattering method using hyperbolic tangent function for vessel sound classification. The sound data is wavelet transformed using a two channel filter-bank and filter-bank outputs are scattered ...
    • Two-dimensional Mellin and mel-cepstrum for image feature extraction 

      Çakir, S.; Çetin, A.E. (2010)
      An image feature extraction method based on two-dimensional (2D)Mellin cepstrum is introduced. The concept of one-dimensional (1D) melcepstrum which is widely used in speech recognition is extended to two-dimensions both ...