Sökning: "memory based quantization"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden memory based quantization.

  1. 1. On speech spectrum coding : interframe memory and perception

    Författare :Fredrik Nordén; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; speech coding; memory based quantization; distortion measure; vector quantization; spectrum coding; speech perception;

    Sammanfattning : .... LÄS MER

  3. 2. 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

  4. 3. Quantization and Noise-Shaped Coding for High Efficiency Transmitter Architectures

    Författare :Ulf Gustavsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Software Defined Radio; Quantization; damped Gauss-Newton; Pulse Density Modulation; Noise-Shaped Coding; ΣΔ-Modulators; Power Amplifier;

    Sammanfattning : Three driving parameters in the development of transmitter technologies for wireless communication today is: energy efficiency, flexibility and footprint reduction. This thesis investigates the use of 1-bit oversampled signal representation, mainly as a power efficiency enhancement technique for the transmitter, but also as a path toward reduced footprint and increased flexibility. LÄS MER

  5. 4. 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

  7. 5. Quantization of Random Processes and Related Statistical Problems

    Författare :Mykola Shykula; Oleg Seleznjev; Patrik Rydén; Igor Rychlik; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; scalar quantization; random process; rate; distortion; additive noise model; run-length encoding; compression; sample estimate; asymptotical normality; Mathematical statistics; Matematisk statistik;

    Sammanfattning : In this thesis we study a scalar uniform and non-uniform quantization of random processes (or signals) in average case setting. Quantization (or discretization) of a signal is a standard task in all nalog/digital devices (e.g., digital recorders, remote sensors etc. LÄS MER