Sökning: "audio coding"

Visar resultat 6 - 10 av 17 avhandlingar innehållade orden audio coding.

  1. 6. Stereophonic Acoustic Echo Cancellation: Theory and Implementation

    Författare :Peter Eneroth; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Stereophonic Acoustic Echo Cancellation; Filterbank; Two-Channel Fast RLS; Two-Channel Frequency-Domain Adaptive filtering; NLMS; Electronics and Electrical technology; Audio Coding; Elektronik och elektroteknik; Signal processing; Signalbehandling; Subband;

    Sammanfattning : The thesis treats theory and implementation aspects for stereophonic acoustic echo cancellation. In Paper I a complete implementation of a stereophonic acoustic echo canceler based on the two-channel fast recursive least-squares algorithm is presented. LÄS MER

  3. 7. Distribution Preserving Quantization

    Författare :Minyue Li; W. Bastiaan Kleijn; Jan Østergaard; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

    Sammanfattning : In the lossy coding of perceptually relevant signals, such as sound and images, the ultimate goal is to achieve good perceived quality of the reconstructed signal, under a constraint on the bit-rate. Conventional methodologies focus either on a rate-distortion optimization or on the preservation of signal features. LÄS MER

  4. 8. Efficient Software Implementation of Stream Programs

    Författare :Gustav Cedersjö; Institutionen för datavetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stream programs; dataflow with firing; Kahn processes; compilers; actor machine;

    Sammanfattning : The way we use computers and mobile phones today requires large amounts of processing of data streams. Examples include digital signal processing for wireless transmission, audio and video coding for recording and watching videos, and noise reduction for the phone calls. LÄS MER

  5. 9. Investigating Communicative Feedback Phenomena across Languages and Modalities

    Författare :Loredana Sundberg Cerrato; David House; Marianne Gullberg; KTH; []
    Nyckelord :HUMANIORA; HUMANITIES; Linguistics; Lingvistik;

    Sammanfattning : This thesis deals with human communicative behaviour related to feedback, analysed across languages (Italian and Swedish), modalities (auditory versus visual) and different communicative situations (human-human versus human-machine dialogues). The aim of this study is to give more insight into how humans use communicative behaviour related to feedback and at the same time to suggest a method to collect valuable data that can be useful to control facial and head movements related to visual feedback in synthetic conversational agents. LÄS MER

  7. 10. Robust Multimedia Communications over Packet Networks

    Författare :Guoqiang Zhang; W. Bastiaan Kleijn; Vinay Vaishampayan; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

    Sammanfattning : Multimedia communications over packet networks, and in particular the voice over IP (VoIP) application, have become an integral part of society. However, the unreliable and heterogeneous nature of packet networks has led to a best-effort delivery of services. LÄS MER