Essays about: "speech codec"

Showing result 1 - 5 of 7 essays containing the words speech codec.

  1. 1. Evaluation of the Perceived Speech Quality for G729D and Opus : With Different Network Scenarios and an Implemented VoIP Application

    University essay from Linköpings universitet/Informationskodning

    Author : Louise Almér; [2022]
    Keywords : Compression; Codec; audio; speech quality; quality of experience;

    Abstract : Communication has always been a vital part of our society, and day-to-day communication is increasingly becoming more digital. VoIP (voice over IP) is used for real-time communication, and to be able to send the information over the internet must the speech be compressed to lower the number of bits needed for transmission. READ MORE

  3. 2. The perceptual impact of different quantization schemes in G.719

    University essay from KTH/Kommunikationsteori

    Author : Bote Liu; [2013]
    Keywords : ;

    Abstract : In this thesis, three kinds of quantization schemes, Fast Lattice Vector Quantization (FLVQ), Pyramidal Vector Quantization (PVQ) and Scalar Quantization (SQ) are studied in the framework of audio codec G.719. FLVQ is composed of an RE8 -based low-rate lattice vector quantizer and a D8 -based high-rate lattice vector quantizer. READ MORE

  4. 3. Stereo coding for the ITU-T G.719 codec

    University essay from Signaler och System

    Author : Tomas Jansson; [2011]
    Keywords : stereo coding; ITU-T G.719; audio; stereo models; stereokodning; ITU-T G.719; ljud; stereomodeller;

    Abstract : This thesis presents a stereo coding architecture for the ITU-T G.719 fullband mono codec. G.719 is suitable for teleconferencing applications with a competitive audio quality for speech and audio signals that are encoded at 32, 48 and 64 kbps. READ MORE

  5. 4. Voice Codec for Floating Point Processor

    University essay from Institutionen för systemteknik

    Author : Johan Ross; Hans Engström; [2008]
    Keywords : Voice codec; floating point; GSM decoder; low precision codec; speech coding;

    Abstract : As part of an ongoing project at the department of electrical engineering, ISY, at Linköping University, a voice decoder using floating point formats has been the focus of this master thesis. Previous work has been done developing an mp3-decoder using the floating point formats. All is expected to be implemented on a single DSP. READ MORE

  6. 5. Data Transmission over Speech Coded Voice Channels

    University essay from Institutionen för systemteknik

    Author : Andreas Tyrberg; [2006]
    Keywords : data transmission; speech codec; voice channel; GSM; UMTS; TETRA;

    Abstract : The voice channel in mobile communication systems have high priority and are almost always available. By using the voice channel also for data transmissions it is possible to get the same availability as for voice calls. But due to speech codecs in the voice channel, regular modems can not be used and special techniques are needed to transmit data. READ MORE