The coefficients of the analysis filter

Hello

Is there anyone who could give me a hint on how to get the coefficients of
the analysis filters!
Thanks !

Hi,
>
>Isn't it correct that the "dbaux command" gives the coefficients of the
>wavelet reconstruction filters? Any suggestion on which command to use
in
>order to get the coefficients of the analysis filter. 
>I am using matlab version 7.0!
>
>Thanks for your time!
>		
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>www.DSPRelated.com
>


		
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mariya wrote:
> Hello
> 
> Is there anyone who could give me a hint on how to get the coefficients of
> the analysis filters!
> Thanks !

What do you want to analyze?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

I'm doing a test on 1D discrete wavelet transform therefore i would like to
know how i can get at least the analysis filter coefficients of some
existing wavelet filters in matlab!


>What do you want to analyze?
>
>Jerry
>-- 

*****************

		
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mariya wrote:
> I'm doing a test on 1D discrete wavelet transform therefore i would like to
> know how i can get at least the analysis filter coefficients of some
> existing wavelet filters in matlab!

It might have been wise to say that initially. The very able people here 
haven't yet developed the knack of reading other's minds.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

I thought my question was clear and was willing to explain more about it if
it was needed in order to get some help! If there is some other persons
willing to give me some hints i am still waiting!
thanks!


>It might have been wise to say that initially. The very able people here

>haven't yet developed the knack of reading other's minds.
>
>Jerry
>-- 
>Engineering is the art of making what you want from things you can get.
>�����������������������������������������������������������������������
>


		
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mariya wrote:
> I thought my question was clear

The question was not clear:

- You mention "the analysis filter" as if it is well-known to
  all readers. It is not.
- You mention "the coefficients" of the filter, as if everybody
  know your application and what you need them for. No one does.

> and was willing to explain more about it if
> it was needed in order to get some help!

At least a brief outline of the problem is very useful in a first
post of a thread. You provided three lines of background in your
second post, that would be the perfect background for your
question. Let's see how the combined contents of those two posts
appear, after I edit them a little bit:

      I'm doing a test on 1D discrete wavelet transform therefore
      i would like to know how i can get at least the analysis
      filter coefficients of some existing wavelet filters in matlab!

      Is there anyone who could give me a hint on how to get the
      coefficients of the analysis filters!
      Thanks !

A lot better than the first post alone, don't you agree? 

Rune

I am not familiar with this forum but i thought the terms i used were
familiar to those dealing with wavelet transform among the readers. Now
that i know how things work here i will take it into account in my next
posts!


>mariya wrote:
>> I thought my question was clear
>
>The question was not clear:
>
>- You mention "the analysis filter" as if it is well-known to
>  all readers. It is not.
>- You mention "the coefficients" of the filter, as if everybody
>  know your application and what you need them for. No one does.
>
>> and was willing to explain more about it if
>> it was needed in order to get some help!
>
>At least a brief outline of the problem is very useful in a first
>post of a thread. You provided three lines of background in your
>second post, that would be the perfect background for your
>question. Let's see how the combined contents of those two posts
>appear, after I edit them a little bit:
>
>      I'm doing a test on 1D discrete wavelet transform therefore
>      i would like to know how i can get at least the analysis
>      filter coefficients of some existing wavelet filters in matlab!
>
>      Is there anyone who could give me a hint on how to get the
>      coefficients of the analysis filters!
>      Thanks !
>
>A lot better than the first post alone, don't you agree? 
>
>Rune
>
>


		
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mariya wrote:
> i thought the terms i used were
> familiar to those dealing with wavelet transform among the readers.

They are. But they are relevant to some 80%-90% of the rest of
DSP as well.

Rune

Rune Allnor wrote:

> mariya wrote:
>> i thought the terms i used were
>> familiar to those dealing with wavelet transform among the
>> readers. 
> 
> They are. But they are relevant to some 80%-90% of the rest of
> DSP as well.

Well above 90% of all DSP were not mentioned though. I think that 
while Mariya's root post was poorly phrased, folks have picked on it 
enough now. Regarding the actual question -- I believe the analysis 
and synthesis filters are the same for orthogonal transforms, which 
comprise the Daubechies wavelets.


Martin

-- 
Quidquid latine dictum sit, altum viditur.

hi,

Thanks for your reply!In the matlab software(version 7.0) that i am using
, it showns that the impulse reponses of the decomposition and
reconstruction filters are different. Therefore i am not sure if we can
use reconstruction filters in a decomposition mechanism!I can get the
coefficients of the reconstruction filters that haven't figure out yet how
to get those of the analysis!

*******************************************************************
I believe the analysis 
>and synthesis filters are the same for orthogonal transforms, which 
>comprise the Daubechies wavelets.
>
>
>Martin
>
>-- 
>Quidquid latine dictum sit, altum viditur.
>




		
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