Sökning: "PESQ"

Visar resultat 1 - 5 av 29 uppsatser innehållade ordet PESQ.

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

    Master-uppsats, Linköpings universitet/Informationskodning

    Författare :Louise Almér; [2022]
    Nyckelord :Compression; Codec; audio; speech quality; quality of experience;

    Sammanfattning : 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. LÄS MER

  3. 2. Homomorphic Encryption for Audio Conferencing

    Master-uppsats, Linköpings universitet/Institutionen för datavetenskap

    Författare :Herman Nordin; Ebba Lindström; [2022]
    Nyckelord :Homomorphic encryption; VoIP; security; audio conferencing; cryptography;

    Sammanfattning : Homomorphic encryption (HE) enables computations on encrypted data making it possible to perform calculations on a server without sharing the secret key for decryption. HE is relatively new and has seen significant improvements in recent years in terms of speed of encryption, decryption, operations, and the number of operations possible to perform in a row without damaging the ciphertext. LÄS MER

  4. 3. Parametric Prediction Model for Perceived Voice Quality in Secure VoIP

    Master-uppsats, Linköpings universitet/Informationskodning

    Författare :Martin Andersson; [2016]
    Nyckelord :VoIP; QoS; Parametric model; Encryption;

    Sammanfattning : More and more sensitive information is communicated digitally and with thatcomes the demand for security and privacy on the services being used. An accurateQoS metric for these services are of interest both for the customer and theservice provider. LÄS MER

  5. 4. Audio quality perception of SCIP encrypted voice transmission over low quality radio links

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Signaler och System

    Författare :Anton Sundin; [2016]
    Nyckelord :SCIP; audio quality perception; packet loss; PESQ;

    Sammanfattning : Tactical radio communications used in military applications hasstrict requirements regarding security and has to be operable inrough environments in which there may be disturbances and disruptionson a radio link. The performance of the Secure CommunicationInteroperability Protocol (SCIP) operating in an asynchronouscommunication network with various levels of packet loss isinvestigated and found inadequate mainly due to problems withcryptographic synchronization between the transmitting and receivingunits. LÄS MER

  7. 5. Quantification of audio quality loss after wireless transfer

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Frida Hedlund; Ylva Jonasson; [2015]
    Nyckelord :Bluetooth link; Mobile phones; Real-life testing; evaluation software; sound quality measurements; objective grading; PESQ; PEAQ; Sound quality; Technology and Engineering;

    Sammanfattning : The report describes a quality measurement for audio, both the theoretical background and implementation. It begins by describing the unlicensed methods the implementation is based on, Segmental SNR, Frequency Weighted Segmental SNR, Log-Likelihood Ratio, Cepstral Distance and Weighted Slope Spectral distance, and the commercial methods used as reference, PEAQ and PESQ. LÄS MER