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LPC analysis window

Started by #ARIJIT BISWAS# May 15, 2008
Hi:

Which is a better LPC analysis window? Hamming or Hanning?
Or, it doesn't matter?

Regards,
~Arijit

Hi,
       windowing is not a factor when you do LP analysis.
       The estimate of spectral envelope obtained using LP analysis is
        not affected by the discontinuity at the window boundary.
        So you can just use a rectangular window.
        The size of window matters somewhat.
        The spectral envelope remains mostly similar when you choose
        the window size to be one, two or three pitch cycles (say,
        10 ms, 20 ms or 30 ms) for a typical male voice.
        The position of the window is also not significant
here.
        However, if you go below one pitch cycle, then
        (a) You have less samples to compute autocorrelation coeffs in LP analysis.
        (b) It depends on which region of pitch cycle you are choosing to analyze.
        So, placement of window is important now.

       The shape of window matters when you do short-time spectral analysis
        using DFT.  Also, the magnitude spectrum obtained from one, two and three
        pitch cycles will have similar envelopes, but different fine structures.


        Bye
        Guru


--- On Thu, 5/15/08, #ARIJIT BISWAS#
<a...@pmail.ntu.edu.sg>
wrote:
From: #ARIJIT BISWAS# <a...@pmail.ntu.edu.sg>
Subject: [speechcoding] LPC analysis window
To: s...
Date: Thursday, May 15, 2008, 2:54 PM




Hi:



Which is a better LPC analysis window? Hamming or Hanning?

Or, it doesn't matter?



Regards,

~Arijit







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