Sökning: "Speech Enhancement"

Visar resultat 21 - 25 av 58 uppsatser innehållade orden Speech Enhancement.

  1. 21. Comparing Dual Microphone System with Different Algorithms and Distances between Microphones

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Ariful Islam; Shafinaz Shahjahan Nitu; [2013]
    Nyckelord :Dual Microphone system DMS ; Babble noise; Adaptive filter; LMS; NLMS.;

    Sammanfattning : Recovering a speech from a noisy environment is the most important work in communication system. The difficulty of this task increased when the signal is attenuated with a babble speech or cross-talk noise. When a mobile user talked in a public place e.g. LÄS MER

  3. 22. Integrated Speech Enhancement Technique for Hands-free Mobile Phones

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :ANEESH KALUVA; [2013]
    Nyckelord :Beamformer; Speech enhancement; Hands-free communication; Spectral subtraction; anechoic; Noise suppression;

    Sammanfattning : This thesis investigates the systems for hands-free mobile communication. In hands-free communication, there are various kinds of disturbances in the microphone reception due to the distance between the source and the receiver. The disturbances are mainly background noise and reverberation. LÄS MER

  4. 23. 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

  5. 24. Estimation of Stapedius-Muscle Activation using Ear Canal Absorbance Measurements : An Application of Signal Processing in Physiological Acoustics

    Master-uppsats, Institutionen för medicinsk teknik; Tekniska högskolan

    Författare :Ghazaleh Ghaffari; [2013]
    Nyckelord :Signal Processing; Physiological Acoustics; Absorbance Measurements; Stapedius-Muscle Activation;

    Sammanfattning : The stapedius muscle, which is located in the middle ear, goes into contraction when the ear is exposed to high sound intensities. This muscle activation is called ‘the acoustic reflex’. Measurement of the acoustic reflex is clinically of importance since it can reveal diagnostic information about the middle ear’s pathologies. LÄS MER

  7. 25. Adaptive Sub band GSC Beam forming using Linear Microphone-Array for Noise Reduction/Speech Enhancement.

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Mamun Ahmed; [2012]
    Nyckelord :Generalized Side lobe Canceller GSC ; Blocking matrix; Microphone array; Sub band; SNR. ;

    Sammanfattning : This project presents the description, design and the implementation of a 4-channel microphone array that is an adaptive sub-band generalized side lobe canceller (GSC) beam former uses for video conferencing, hands-free telephony etc, in a noisy environment for speech enhancement as well as noise suppression. The side lobe canceller evaluated with both Least Mean Square (LMS) and Normalized Least Mean Square (NLMS) adaptation. LÄS MER