On 2004-11-03 08:48:08 +0100, Bob Cain <arcane@arcanemethods.com> said:

> I was hoping I'd be contradicted in the above statement by advancements 
> happening since I looked at them.  :-)

I think I already did that... :-)
-- 
Stephan M. Bernsee
http://www.dspdimension.com


Andor wrote:

> Bob Cain wrote:
> ...
> 
>>They have mostly been useful for data reduction of video 
>>information and for other kinds of encoding.  I'm not sure 
>>if anyone has tried to apply the same methods to audio but 
>>my suspicion is that the artifacts, while ok for video and 
>>fingerprints, would be horrible for audio.
> 
> 
> Markus Erne's phd thesis at ETH Zurich might be of interest to you:
> "Signal adaptive audio coding using wavelets and rate optimization"

I was hoping I'd be contradicted in the above statement by 
advancements happening since I looked at them.  :-)

I'm very interested, do you happen to have a link to that?


Thanks,

Bob
-- 

"Things should be described as simply as possible, but no 
simpler."

                                              A. Einstein

Mads G. Christensen wrote:
> Hi Andor.
> 
> Andor> Markus Erne's phd thesis at ETH Zurich might be of interest to
> Andor> you: "Signal adaptive audio coding using wavelets and rate
> Andor> optimization"
> Andor> Regards, Andor
> 
> Is it available somewhere online?? (I couldn't find it).

I couldn't either. But you may want to look at the DAFx homepage,
there is quite a lot of wavelet based material online (I saw quite an
interesting one which proposed signal processing on the wavlet
coefficients).

http://www.dafx.de/

Regards,
Andor

Hi Andor.

Andor> Markus Erne's phd thesis at ETH Zurich might be of interest to
Andor> you: "Signal adaptive audio coding using wavelets and rate
Andor> optimization"
Andor> Regards, Andor

Is it available somewhere online?? (I couldn't find it).

-- 
/Mads

Bob Cain wrote:
...
> They have mostly been useful for data reduction of video 
> information and for other kinds of encoding.  I'm not sure 
> if anyone has tried to apply the same methods to audio but 
> my suspicion is that the artifacts, while ok for video and 
> fingerprints, would be horrible for audio.

Markus Erne's phd thesis at ETH Zurich might be of interest to you:
"Signal adaptive audio coding using wavelets and rate optimization"

Regards,
Andor

On 2004-11-02 05:22:38 +0100, Bob Cain <arcane@arcanemethods.com> said:

> Glad to hear that at least my intuition was on the mark, if not my 
> ability to see any further than that.  Have you published anything or 
> does it all remain proprietary?
> 
> Which of your products employ this?
> 
> 
> Thanks,
> 
> Bob

Not sure if my last posting made it to the group, here's the link 
information again:

On 2004-11-01 18:58:09 +0100, Stephan M. Bernsee <spam@dspdimension.com> said:

> Sorry - that would be http://www.prosoniq.com in case you're interested.
> 
> Btw., some audio examples of non-DFT based DSP processing are here: 
> http://www.prosoniq.com/html/morphaudioex.html and here: 
> http://www.prosoniq.com/html/mpexaudioex.html
> 
> And some other related links of interest: http://neuron.prosoniq.com 
> and http://mpex.prosoniq.com
> 

-- 
Stephan M. Bernsee
http://www.dspdimension.com


Stephan M. Bernsee wrote:


>> They have mostly been useful for data reduction of video information 
>> and for other kinds of encoding.  I'm not sure if anyone has tried to 
>> apply the same methods to audio but my suspicion is that the 
>> artifacts, while ok for video and fingerprints, would be horrible for 
>> audio.
>  
> We do it all the time at the company I'm working for. Not with a 
> "simple" straightforward DWT, but the theory is similar.

Glad to hear that at least my intuition was on the mark, if 
not my ability to see any further than that.  Have you 
published anything or does it all remain proprietary?

Which of your products employ this?


Thanks,

Bob
-- 

"Things should be described as simply as possible, but no 
simpler."

                                              A. Einstein


DSP curious wrote:

> In this situation I am not doing the inverse transform, so I will not
> have problems with artifacts.

Analysis is where they shine so they may well be worth your 
study.


Bob
-- 

"Things should be described as simply as possible, but no 
simpler."

                                              A. Einstein

On Sun, 31 Oct 2004 22:02:19 +0100, "DSP curious" <dsp@iname.com>
wrote:

>Hi,
>
>I have just bought these books:
>
>"Understanding Digital Signal Processing", by Richard G. Lyons
>"Introduction to Signal Processing", by Orfanidis
>"A Wavelet Tour of Signal Processing", by Stephane Mallat
>
>I must say that I really like Richard's book.
>It is very accessible and informative.
>The others are a little hard to understand mathematically.
>
>I am thinking about buying the books below also, so my question is:
>Does anyone know these books and can they be recommended?
>
>"Wavelets and Filter Banks", by Gilbert Strang, Truong Nguyen
>"Practical Time-frequency Analysis: Gabor and Wavelet Transforms with an
>Implementation in S", by Rene Carmona, et al
>"Digital Audio Restoration", by S.J. Godsill, P.J.W. Rayner
>
>My interest is audio and what I would like to get from the books is
>practical ideas and methods that I can program.
>"Wavelets and Filter Banks" has allready been recommended, so I almost
>certainly will buy that one.
>
>Best regards,
>Michael

Hi Michael,

   Thanks for your "positive" comments 
on comp.dsp recently about my DSP book.
I appreciate it.

Michael, if you tell me which edition, and which 
"printing Number" of my book that you have, I'll 
send you an errata.  The first edition is the book 
with the red & white cover.  The 2nd edition has 
a red & orange cover.

Which edition do you have?  (The Printing Number 
information is different in the two editions.)

I tried to send you a private E-mail, but it 
"bounced back" to me.

Best Regards,
[-Rick-]