Windowing problem before LPC |
Windowing problem before LPC |
 Mar 17 2010, 02:55
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#1
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Group: Members Posts: 99 Joined: 2-August 07 From: Shanghai,China Member No.: 45817  |
Why window the signal before computing LPC coefficients?
What is the whys of windowing? I know windowing can prevent spectrum leakage,but LPC is none of business of FFT, so it has no spectrum leakage. Any comments would be appreciated! |
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Apr 4 2010, 03:13
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#2
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Group: Members Posts: 5 Joined: 19-December 09 Member No.: 76147 |
QUOTE (hyeewang @ Mar 17 2010, 02:55)  Why window the signal before computing LPC coefficients? What is the whys of windowing? I know windowing can prevent spectrum leakage,but LPC is none of business of FFT, so it has no spectrum leakage. Any comments would be appreciated! in LPC (linear prediction) you are predicting a value of next sample based on some number of previous samples. if you just take a block of signal "without windowing" (apply a rectangular window on a signal to be correct) then, on a beggining of a block you are actually trying to predict something from a bunch of previous zeros, and at the end of a block you are trying to predict zeros from some signal. that is why the prediction error is very high on the beggining and at the end of a block. by using windowing you make this error much smaller. This post has been edited by igor_b: Apr 4 2010, 03:14 |
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hyeewang Windowing problem before LPC Mar 17 2010, 02:55
jmvalin QUOTE (hyeewang @ Mar 17 2010, 10:55) Why... Mar 20 2010, 03:39
bluepen QUOTE (igor_b @ Apr 4 2010, 10:13) QUOTE ... Jun 18 2010, 18:10 jmvalin QUOTE (bluepen @ Jun 19 2010, 02:10) Anot... Jun 20 2010, 05:07 |
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