Sökning: "echo-canceller"

Visar resultat 1 - 5 av 6 uppsatser innehållade ordet echo-canceller.

  1. 1. Subband Adaptive Filtering Technique employing APA For Stereo Echo Cancellation over Audio Signals

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

    Författare :BHANUDURGA SRI SATYA SIMHA EDAMAKANTI; VISHNU CHAITANYA GUNDU; [2014]
    Nyckelord :Stereo Echo Cancellation; NLMS; RLS; MCHA; APA; Subband Adaptive Modeling.; Master of Science Programme in Electrical Engineering with emphasis on Signal Processing Masterprogram i Elektroteknik med inriktning mot signalbehandling;

    Sammanfattning : The world today is relying on hands free devices and teleconferencing equipments but the major problem with the use of these systems is creation of acoustic echo at the time of conversation. The quality of information to be transmitted and received is degraded due to the echo. LÄS MER

  3. 2. Methods and algorithms for quality and performance evaluation of audio conferencing systems

    Master-uppsats, Institutionen för fysik

    Författare :Maria Palmqvist; [2013]
    Nyckelord :AEC; loudspeaker performance; audio conferencing systems; PESQ; MOS; THD; ERLE; CSD;

    Sammanfattning : In an audio conferencing system the sound from the loudspeaker is undesirably picked up by the microphone. This introduces echoes to the system. To remove the echoes an acoustic echo canceller can be built with an adaptive filter. LÄS MER

  4. 3. Performance Analysis of Adaptive Algorithms based on different parameters Implemented for Acoustic Echo Cancellation in Speech Signals

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Swathi Kotte; [2011]
    Nyckelord :least mean square LMS Algorithm; Leaky Least mean square LLMS Algorithm; Normalized Least Mean Square NLMS Algorithm and Recursive Least Square RLS Algorithm ; additive white Gaussian noise ; Return Loss Enhancement ERLE ; signal to noise ratio;

    Sammanfattning : Echo cancellation in voice communication is a process of removing the echo to improve the clarity, quality of the voice signals by suppressing the silence signal which prevents echoes during transmission through networks. There are two types of echo in voice communication: Hybrid echo cancellation and Acoustic echo cancellation. LÄS MER

  5. 4. HANDSFREE-ENHET FÖR MOBIL TRYGGHETSTELEFON

    Kandidat-uppsats, Örebro universitet/Institutionen för teknik; Örebro universitet/Akademin för naturvetenskap och teknik

    Författare :Daniel Sundberg; [2009]
    Nyckelord :electro; acoustic; sound; audio; hands-free; hands; free; cellphone; telephone; mobilephone; phone; safety; telefon; bluetooth; speaker; speakerphone; senior; older; waterproof; water-proof; resistant; water-resistant; dust; GSM; GPS; IP; presbyacusis; hearing; loss; hearing-loss; echo; echo-cancelling; echo-canceller; background; background-noise; suppressing; suppressor; elektroteknik; elektronik; akustik; ljud; hands-free; mobiltelefon; trygghetstelefon; telefon; blåtand; bluetooth; högtalare; högtalartelefonfunktion; högtalartelefon; äldre; vattentät; vattenavrinning; avrinning; vattentålig; smuts; damm; GSM; GPS; IP; presbyacusis; hörsel; hörselnedsättning; eko; ekosläckning; bakgrundsstörning; bakgundsstörningsundertryckning; undertryckning;

    Sammanfattning : Cnior Mobile AB i Lindesberg utvecklar en mobil trygghetstelefon för äldre. Detta examensarbete går ut på att utforma en handsfree-enhet för denna. Handsfree-enheten ska integreras i larmknappen, som bärs av användaren runt handleden, och har kontakt med telefonen via blåtandsradio. LÄS MER

  7. 5. Evaluation of a Floating Point Acoustic Echo Canceller Implementation

    Uppsats för yrkesexamina på grundnivå, Institutionen för systemteknik

    Författare :Anders Dahlberg; [2007]
    Nyckelord :AEC; DSP; Floating-point format; NLMS; Quantization;

    Sammanfattning : This master thesis consists of implementation and evaluation of an AEC, Acoustic Echo Canceller, algorithm in a floating-point architecture. The most important question this thesis will try to answer is to determine benefits or drawbacks of using a floating-point architecture, relative a fixed-point architecture, to do AEC. LÄS MER