LPC analysis window | Speech Coding






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...@yahoogroups.com
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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Discussion Groups | Speech Coding | LPC analysis window

LPC analysis window - #ARIJIT BISWAS# - May 15 7:15:24 2008

Re: LPC analysis window - GuruPrasad S - May 15 14:53:24 2008