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Topic: Symmetric extension question
Replies: 1   Last Post: Dec 31, 1997 9:18 AM

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Jason Walter Bold

Posts: 57
Registered: 12/7/04
Symmetric extension question
Posted: Dec 30, 1997 10:21 PM
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Hi all,

I have *almost* finished a problem with symmetric extension and I am
wondering if anyone here is familiar with it and has maybe gotten
the parameters 100% right, as I feel I have not. The idea is this...

You can take a finite input signal and extend the start and end of it
by adding a mirror image of the front and end. Then you run it through
a filter bank, apply a window and decimate.

For reconstruction, you do the opposite... extend, interpolate, convolve,
and window.

Anyone done this before? Mine is almost working, but I am not sure how
to determine the truncation lengths and whether or not I should keep the
first or 2nd. sample on decimation and interpolation. I seem to get
either a small error at the endpoints or a phase shift of one sample.



Jason -
Of course I always think my opinion is right! If I didn't, it wouldn't be my
opinion now would it?

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