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Sökning: WFRF:(Hedelin Per 1948)

  • Resultat 1-50 av 50
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  • Bergström, Anders, 1971, et al. (författare)
  • Code-Book Driven Glottal Pulse Analysis
  • 1989
  • Ingår i: Proc. IEEE Int. Conf. ICASSP-89, Glasgow, Scotland. ; 1, s. 53-56
  • Konferensbidrag (refereegranskat)
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  • Brauer, Peter, 1957, et al. (författare)
  • Model or Non-Model Based Classifiers
  • 1991
  • Ingår i: Proc. EUROSPEECH-91, Genova, Italy. ; 2, s. 1027-1030
  • Konferensbidrag (refereegranskat)
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  • Hagen, Roar, 1965, et al. (författare)
  • Tree-Search Quantization of LSP-Parameters
  • 1989
  • Ingår i: Proc. IEEE Workshop on Speech Coding for Telecommunication, Vancouver, Canada. ; , s. 42-45
  • Konferensbidrag (refereegranskat)
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  • Hedelin, Per, 1948, et al. (författare)
  • SD Optimization of Spectral Coders
  • 1999
  • Ingår i: Proc. IEEE Speech Coding Workshop, Provoo, Finland. ; , s. 28-30
  • Konferensbidrag (refereegranskat)
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  • Hedelin, Per, 1948 (författare)
  • Spectral Coding at 20 bits
  • 1994
  • Ingår i: Proc. IEEE Int. Conf. ICASSP-94, Adelaide, Australia. ; , s. 525-527
  • Konferensbidrag (refereegranskat)
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  • Lindblom, Jonas, 1974, et al. (författare)
  • Model Based Spectrum Prediction
  • 2000
  • Ingår i: Proc. of the 2000 IEEE Workshop on Speech Coding. ; , s. 117-119
  • Konferensbidrag (refereegranskat)
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  • Persson, Daniel, et al. (författare)
  • A Statistical Approach to Packet Loss Concealment for Video
  • 2005
  • Ingår i: Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005. Proceedings. (ICASSP '05).. - 0780388747 ; 2:2005, s. 293 - 296
  • Konferensbidrag (refereegranskat)abstract
    • We have developed a statistical prediction technique to compensate for lost pixel blocks during real time transmission of video over packet-switched networks. The approach could as well be used for standard inter-frame coding. The method is based on the joint modeling of pixel statistics by Gaussian mixtures. Different EM variants for decreasing computational complexity and storage space are proposed. In the case of 4×4 luminance blocks, ourmethod increases performance by 2.3 dB when augmenting the number of mixture components from 1 to 64. We show that these results are statistically significant.
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  • Samuelsson, Jonas, 1971, et al. (författare)
  • Recursive Coding of Spectrum Parameters
  • 1999
  • Ingår i: Proc. IEEE Speech Coding Workshop, Provoo, Finland. ; , s. 37-39
  • Konferensbidrag (refereegranskat)
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  • Shabestary, T. Z., et al. (författare)
  • LSP quantization by a union of locally trained codebooks
  • 2005
  • Ingår i: IEEE Transactions on Speech and Audio Processing. - 1063-6676. ; 13:5, s. 811-820
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a fixed rate encoding scheme for the line spectrum pair (LSP) representation of an LPC-filter, based on Gaussian mixture (GM) modeling. For each mixture component, we construct a codebook by a union of product quantizers. Each local codebook is trained, independently, using a clustering scheme similar to the generalized Lloyd algorithm (GLA), over synthetic data. The training algorithm iterates fast, due to low complexity encoding, and converges in few iterations. The overall codebook is a combination of local codebooks, and inherits their high performance, while having a moderate complexity. We provide numerical results for average spectral distortion (SD) of the proposed encoder, and benchmark them by a lower bound, according to high-rate theory. We achieve an average SD (full-band measure) of l dB at 23 b/frame, for speech signals sampled at 8 kHz and LPC of order 10. By tolerating additional complexity, we reach a SD within 0.01 dB of the lower bound.
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  • Shabestary, T. Z., et al. (författare)
  • Vector quantization by companding a union of Z-lattices
  • 2005
  • Ingår i: IEEE Transactions on Information Theory. - 0018-9448 .- 1557-9654. ; 51:2, s. 738-746
  • Tidskriftsartikel (refereegranskat)abstract
    • An encoding scheme is presented based on random coding theory in conjunction with companding techniques. This combination provides an easy design, and a low-storage quantizer. The groundwork of the study is Gaussian sources. The motivation is the attractive properties of Gaussian and Gaussian mixtures (GMs), and their applications in data compression. Here, codebooks are generated by companding a union of randomly translated cubic lattices. The compander functions operate scalar wise, providing an affordable encoding complexity that is rate independent. For such a codebook, an optimal search, and the indexing of the codevectors are addressed. Performance close to finite-dimensional random coding is achieved, while the complexity is not far from scalar coding. The structure of the codebook balances between complexity and performance. In comparison to some other methods, the advantage of the proposed scheme is more distinct for correlated sources.
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  • Resultat 1-50 av 50

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