Ch8-Speech&Audio_Coding_Examples

Ch8-Speech&Audio_Coding_Examples - Speech &...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Examples
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
2/11/12 Veton Këpuska 3 Windowing Analysis Stage N – Length of the  Analysis Window 10-30 msec
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/11/12 Veton Këpuska 4 Some Analysis Windows
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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. 
Background image of page 6
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
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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)
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 37

Ch8-Speech&Audio_Coding_Examples - Speech &...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online