R110
Member level 3
speech parcor
HI all
I have a conclusion problem in my final term project (speech processing).
In this project I want to add normal noise {n(0,.01)} to LPC, PARCOR and LSF coefficients and check the theory that says PARCOR and LSF coefficeins are more roboust in copare with LPC coefficients.
I have 5 sound files (phonems) including a vowel, nasal, fricative, affricative and stop which are windowed by a hamming window ( length of window is 256 with 50% overlap). then I compute the LPC coefficents in a matrix with N rows and M coloums ( each coloumm contains the LPC coef for one
windowed frame), then I used LPC to PACOR and LPC to LSF converter functions to get these coeffs. the I added same noral noise to LPC, PARCOR and LSF coeffs for L=4 , L=14 and L=50. I plotted the results and I put then In the attached file. (for example noisyLPC=.1*noise*LPC+LPC and ...)
The fft of windowed frame is plotted in green , noisy coefficeints in red and noise-free coeffsare plotted in blue.
The main question is why LSF coeffs are so weak after adding noise?
and why PARCOR and LSF coeffs are not roboust in noise???
HI all
I have a conclusion problem in my final term project (speech processing).
In this project I want to add normal noise {n(0,.01)} to LPC, PARCOR and LSF coefficients and check the theory that says PARCOR and LSF coefficeins are more roboust in copare with LPC coefficients.
I have 5 sound files (phonems) including a vowel, nasal, fricative, affricative and stop which are windowed by a hamming window ( length of window is 256 with 50% overlap). then I compute the LPC coefficents in a matrix with N rows and M coloums ( each coloumm contains the LPC coef for one
windowed frame), then I used LPC to PACOR and LPC to LSF converter functions to get these coeffs. the I added same noral noise to LPC, PARCOR and LSF coeffs for L=4 , L=14 and L=50. I plotted the results and I put then In the attached file. (for example noisyLPC=.1*noise*LPC+LPC and ...)
The fft of windowed frame is plotted in green , noisy coefficeints in red and noise-free coeffsare plotted in blue.
The main question is why LSF coeffs are so weak after adding noise?
and why PARCOR and LSF coeffs are not roboust in noise???