On Aug 23, 2012, at 8:31 AM, Clemens Novak wrote:
> On 2012-08-20 19:25, Luc Maisonobe wrote:
>> Le 20/08/2012 17:00, Clemens Novak a écrit :
>>> Dear all,
>>
>> Hi Clemens,
>>
>>>
>>> I would like to work on some signal processing functions (as indicated
>>> on the wiki WishList) and started with the convolution of 2 sequences
>>> (represented as RealVector). I have completed a first working version
>>> (some error checking code, formatting, unit tests etc are missing); I am
>>> unsure of how to continue: Is the next step to create a new Jira ticket
>>> and upload my final code there (for further discussion/review/...)?
>>
>> Yes, you can do that.
>>
>>>
>>> Thanks for your help & kind regards - Clemens
>>
>> Thanks for your interest and contribution.
>>
>> Luc
>>
>>>
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>>
>>
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>
> Dear all,
>
> besides the ongoing discussions in MATH-851, I would like to discuss some
> extensions of this library in the area of discrete-time signal processing:
>
> (1) convolution of 1D and 2D sequences based on (i) straightforward
> calculation of the convolution sum and (ii) using the FFT.
>
> (2) filter functions for 1D sequences, i.e. y[n] = \sum_{l=0}^{L-1} b_l
> x[n-l] - \sum_{m=1}^{M-1} a_m y[n-m]
>
> (3) window functions (such as raised cosine, blackmann...) used in
> conjunction with FFTs
>
> (4) possibly some basic filter design (such as window method, Parks-McClellan
> algorithm...)
>
> However, first I want to ensure that you think these topics belong in Commons
> math - I have been reading the intro (... is a library of lightweight,
> self-contained mathematics and statistics components addressing the most
> common problems...) and I am not perfectly sure whether these topics really
> fit here?
>
> In MATH-851 we shortly touched whether using RealVector or a simple double
> array is better. What's your opinion here? The double array might be better
> in terms of performance; when based on RealVector, however, more basic
> functionality would be provided out of the box. Has anyone made a performance
> comparison between arrays and RealVector in order to have some guidelines
> here?
>
> Kind regards - Clemens
>
I use Commons Math extensively in signal processing applications so I, for one,
would love to see more features in this area.
cheers,
Bruce
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