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Analysis of Effects of Train/Car noise in Formant Track Estimation

Analysis of Effects of Train/Car noise in Formant Track Estimation. Qin Yan Department of Electronic and Computer Engineering Brunel University 28 January, 2004. Content. Aim of current work Variation in formant SNR Effect of train/car noise on formant frequency estimation

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Analysis of Effects of Train/Car noise in Formant Track Estimation

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  1. Analysis of Effects of Train/Car noise in Formant Track Estimation Qin Yan Department of Electronic and Computer Engineering Brunel University 28 January, 2004

  2. Content • Aim of current work • Variation in formant SNR • Effect of train/car noise on formant frequency estimation • Effect of train/Car noise on formant tracking • Future work plan

  3. Formant track can be employed for noise reduction. To obtain the reliable formant tracks from noisy speech, it is necessary to analyse the effects of train/car noise on formants estimation. It is divided into two parts: Effect of train/car noise on formant frequency estimation Effect of train/car noise on formant tracking Aim of Current Work

  4. Variation in Formant SNR Table : Formant SNR of car noisy speech (SNR=0) Table : Formant SNR of train noisy speech (SNR=0) • F1 is the most affected by train/car noise and F5 is less effected. • Female is less affected by train/car noise than male. • Train noise has more impact on Formant SNR than car noise.

  5. Cepstral Feature Analysis Speech HMMs Training Speech Labelling & Segmentation Source Speech Formant Tracking Formant Estimated values LP Pole Analysis Formant Features Extraction Formant 2D HMMs Training Formant Estimation by 2D-HMM Formant Feature Extraction D-estimator Formant candidate Feature vector Speech Frequency, Bandwidth, Magnitude Calculation Segmentation & window Polynomial roots LPC Model

  6. Formant Frequency Estimates in Train Noise • F1 of different vowels is moving towards the high frequency around 620 Hz. • F2,F3 and F4 is less affected by the noise.

  7. Formant Frequency Estimates in Car Noise

  8. Effect of Train/Car Noise on Formant Tracking Figure : Red -- formant tracks from clean speech; Blue -- formant tracks from car noisy speech (SNR=0); Cyan -- formant tracks from train noisy speech (SNR=0) Formant tracks from train noisy speech is more affected than car noise speech at same SNR

  9. Robust estimation of clean formant tracks from train/car noisy speeches at various SNR conditions. -- LP subtraction. -- pole classification/separation. -- incorporated with other information such as temporal continuity. Robust estimation of clean pitch tracks from train/car noisy speeches. Future Work

  10. Thank you !

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