Sökning: "speech coding"

Visar resultat 21 - 25 av 41 avhandlingar innehållade orden speech coding.

1. 21. Neural correlates of irrelevant speech

   Författare :Jens Gisselgård; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : The irrelevant speech effect refers to a reduction in the immediate serial recall of lists of presented items when irrelevant auditory material is presented together with the items to be memorized. The ability to ignore irrelevant distractors is vital in increasingly demanding work environments and the capability to keep information in and out of mind is central in human information processing. LÄS MER

3. 22. Annan-orientering i masskommunicerande brevtexter : en tentativ modell

   Författare :Johanna Ledin; Greger Andersson; Ulla Moberg; Henrik Rahm; Örebro universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; other-orientation; tentative model; grammar; pragmatics; coding; dialogical theories; interaction; mass communication; letters; model reader; Svenska språket; Swedish Language;

   Sammanfattning : The aim of this thesis is to operationalise the concept of other-orientation. Based on an explorative approach, a tentative model for analysing the marks of other-orientation is developed. The model consists of four grammatical and pragmatic categories in language: deixis, speech acts, modality, and evaluative words. LÄS MER

4. 23. Vector Quantization in Speech Coding. Variable Rate, Memory and Lattice Quantization

   Författare :Thomas Eriksson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : This dissertation focuses on different quantization methods in speech coding. Variable rate quantization has the potential to substantially reduce the bit rate requirements in speech coding. LÄS MER

5. 24. On Soft Decoding and Robust Vector Quantization

   Författare :Mikael Skoglund; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; speech and image coding; intersymbol interference; Rayleigh fading; soft decoding; CDMA; index assignment; Hadamard transform; channel optimized VQ; robust VQ; combined source-channel coding; vector quantization VQ ; noisy channels;

   Sammanfattning : This thesis considers vector quantization for noisy channels. Vector quantization (VQ) is an important technique for block-based source coding, with applications in, e.g., speech and image coding. LÄS MER

7. 25. Towards Asymptotic Vector Quantization

   Författare :Jonas Samuelsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; EM algorithm; parametric models; expectation maximization; spectrum coding; Gaussian mixture models; fast search; bounded support; multidimensional companding; vector quantization; high rate quantization;

   Sammanfattning : We study topics in source coding, and vector quantization (VQ) in particular. We approach VQ from two directions: a theoretical starting point based on high rate quantization theory, and a practical based on a database desription of the signal source. LÄS MER