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Ch8-Speech&amp;Audio_Coding_Examples

# Ch8-Speech&amp;Audio_Coding_Examples - Speech Audio...

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Examples

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2/11/12 Veton Këpuska 2 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
2/11/12 Veton Këpuska 3 Windowing Analysis Stage N – Length of the  Analysis Window 10-30 msec

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2/11/12 Veton Këpuska 4 Some Analysis Windows
2/11/12 Veton Këpuska 5 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 [ ] ( 29 [ ] ( 29 window vorbis 5 . 0 sin 2 sin window sine 5 . 0 sin 2 + = + = N n n w N n n w π

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2/11/12 Veton Këpuska 6 LPC Analysis Stage u LPC Method Described in: n Ch5-Analysis_&_Synthesis_of_Pole- Zero_Speech_Models.pptx u Summary: n Perform Autocorrelation n Solve system of equations with Durbin- Levinson Method u MATLAB help n doc lpc, etc.
2/11/12 Veton Këpuska 7 Example of MATLAB Code function myLPCCodec(wavfile, N) % % wavfile - input MS wav file % N - LPC Filter Order % ( 29 ( 29 z A z H 1 = 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

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2/11/12 Veton Këpuska 8 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: n Double (float64) representation (software emulation)
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Ch8-Speech&amp;Audio_Coding_Examples - Speech Audio...

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