LPC Matlab demo, help needed for 16khz signal

Hello

I have 16KHz signal, i want to use "LPC Analysis and Synthesis Model in
Matlab" "dsplpc" to perform a simulation of LPC. 

I am having problem in defining frame length and buffer size, the output
is not of good quality and it sounds like a signal sampled at 8Khz.

I found that the signal behaves to be WSS at about 310 samples using the
spectrogram utility.

So then I used samples / frame=200 in "source block parameter" window.
Output buffer size = 256 and buffer overlap=26 in the "overlap analysis
window. The lag of autocorrelation is 10-20 but by changing it the result
doesnt improves. All other values are default values as were used for 8Khz
signal in origional demo.

actually the model was built for 8Khz signal and I have a 16Khz signal so
it it necessary to modify the preemphasis filter values if yes then how?

Can you please explain the relation between buffer size and buffer overlap
and is there any other method to check the WSS property of my speech signal
which is of about 5s duration.

thanks

On Dec 3, 8:23&#4294967295;pm, "awaisk" <awais.e...@gmail.com> wrote:
> Hello
>
> I have 16KHz signal, i want to use "LPC Analysis and Synthesis Model in
> Matlab" "dsplpc" to perform a simulation of LPC.
>
> I am having problem in defining frame length and buffer size, the output
> is not of good quality and it sounds like a signal sampled at 8Khz.
>
> I found that the signal behaves to be WSS at about 310 samples using the
> spectrogram utility.
>
> So then I used samples / frame=200 in "source block parameter" window.
> Output buffer size = 256 and buffer overlap=26 in the "overlap analysis
> window. The lag of autocorrelation is 10-20 but by changing it the result
> doesnt improves. All other values are default values as were used for 8Khz
> signal in origional demo.
>
> actually the model was built for 8Khz signal and I have a 16Khz signal so
> it it necessary to modify the preemphasis filter values if yes then how?
>
> Can you please explain the relation between buffer size and buffer overlap
> and is there any other method to check the WSS property of my speech signal
> which is of about 5s duration.
>
> thanks

I dont know much about the tool, but these are the parameters for a 16
Khz speech signal.
LPC order = 20.
frame length for LPC analysis = 320 (20ms).
frame overlap for LPC Analysis = 160 (10ms).

speech signal is quasi stationary.