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Träfflista för sökning "WFRF:(Pasha Shahab) srt2:(2021)"

Sökning: WFRF:(Pasha Shahab) > (2021)

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1.
  • Pasha, Shahab, et al. (författare)
  • Machine-learnt Beamforming for Large Aperture 3D Microphone Arrays, An Industrial Application
  • 2021
  • Ingår i: IEEE 23rd International Workshop on Multimedia Signal Processing, MMSP 2021. - : IEEE. - 9781665432870
  • Konferensbidrag (refereegranskat)abstract
    • An eight-element 3D microphone array is designed for source separation and noise cancellation applications in noisy and reverberant environments with multiple sound sources. In the first phase the non-negative matrix factorization is applied to each channel of the array to isolate the target signal from the mixture. In the second phase a machine learning approach is applied for designing a beamformer by the means of deep learning techniques to learn and reconstruct the target signal coefficients. The matrix factorization and machine-learnt beamforming are shown effective tools for speech and music analysis in this contribution they are adapted to a novel context of non-stationary industrial signals. It is also shown that the proposed 3D array is a more effective tool for capturing the acoustic scene compared with the 2D rectangular sub-array (only the four microphones in the front panel) in terms of noise suppression and signal quality. A comparison made the proposed machine-learnt beamforming method and the baseline analytical method suggests superior performance of the machine-learnt approach.
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2.
  • Pasha, Shahab, et al. (författare)
  • Multi-channel electronic stethoscope for enhanced cardiac auscultation using beamforming and equalisation techniques
  • 2021
  • Ingår i: 28th European Signal Processing Conference (EUSIPCO). - : IEEE. - 9789082797053 ; , s. 1289-1293
  • Konferensbidrag (refereegranskat)abstract
    • This paper reports on the implementation of a multi-channel electronic stethoscope designed to isolate the heart sound from the interfering sounds of the lungs and blood vessels. The multi-channel stethoscope comprises four piezo contact microphones arranged in rectangular and linear arrays. Beamforming and channel equalisation techniques are applied to the multi-channel recordings made in the aortic, pulmonary, tricuspid, and mitral valve areas. The proposed channel equaliser cancels out the distorting effect of the chest and rib cage on the heart sound frequency spectrum. It is shown that the applied beamforming methods effectively suppress the interfering lung noise and improve the signal to interference and noise ratio by 16 dB. The results confirm the superior performance of the implemented multi-channel stethoscope compared with commercially available single-channel electronic stethoscopes. 
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  • Resultat 1-2 av 2
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konferensbidrag (2)
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refereegranskat (2)
Författare/redaktör
Lundgren, Jan, 1977- (2)
Pasha, Shahab (2)
Ritz, Christian (1)
Arian, Arian (1)
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Mittuniversitetet (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
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2021 (2)Ta bort avgränsningen

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