Ch5-Speech&Audio_Coding_Examples

Ch5-Speech&A - Click to edit Master subtitle style Veton Këpuska Speech& Audio Processing Speech& Audio Coding Examples Veton

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Unformatted text preview: Click to edit Master subtitle style 6/3/09 Veton Këpuska Speech & Audio Processing Speech & Audio Coding Examples 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 22 A Simple Speech Coder u LPC Based Analysis Structure Pre- emphasis Windowing Analysis Auto- Correlation Levinson- Durbin Linear Prediction Analysis Audio Input Analysis Filter Residual Filter Coeffs Residual Filter Coeffs Quantization 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 33 Windowing Analysis Stage N – Length of the Analysis Window 10-30 msec 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 44 Some Analysis Windows 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 55 MATLAB Useful Functions u wintool n Use “doc wintool” for more information u window n Use “>doc window” for the list of supported windows u Define your own window if needed e.g: n Sine window and Vorbis window 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 66 LPC Analysis Stage u LPC Method Described in: n Ch5-Analysis_&_Synthesis_of_Pole- Zero_Speech_Models.ppt u Summary: n Perform Autocorrelation n Solve system of equations with Durbin- Levinson Method u MATLAB help 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 77 Example of MATLAB Code function myLPCCodec(wavfile, N) % % wavfile - input MS wav file % N - LPC Filter Order % ŝ[n] [ ] [ ] [ ] ∑ = +- = p k k n ge k n s n s 1 ˆ ˆ α Impulse Train Noise Generator Voiced Unvoiced Vocal Tract Model Gain 6/3/09 Veton Këpuska 6/3/09 Veton Këpuska 88 Analysis of Quantization Errors u Use MATLAB functions to research the effects of quantization errors introduced by precision of the arithmetic operations and representation of the filter and error signal:...
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This note was uploaded on 02/10/2012 for the course ECE 3552 taught by Professor Staff during the Fall '10 term at FIT.

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Ch5-Speech&A - Click to edit Master subtitle style Veton Këpuska Speech& Audio Processing Speech& Audio Coding Examples Veton

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