[hpsdr] WELCH_WINDOW in Kiss Konsole

[georg Prinz]

Hi,

thank you all for your extremely helpful information on filters and 
their design.
Now I have a lot of lovely naterial to get busy with in the month to come.
73,
Georg,
dl2kp


Am 28.12.2016 um 17:57 schrieb Kok Chen:
> On Dec 28, 2016, at 5:43 AM, georg Prinz wrote:
>
>> I never encountered the Dolph-Chebyshev window in a real application. Looking at the fourier transform, this should be an ideal function, isn`t it?
> Dolph-Chebysev windows have equiripple for the prototype function.  After they are applied to weight a filter's input, the resultant filter is no longer equiripple.  I.e., the window itself is equiripple, the resultant filter is not.
>
> To get an equiripple FIR filter, you will need to use something like the Remez Exchange algorithm to design the filter.  I do not know of a simple window that will result in an equiripple filter.
>
> Dolph-Chebysev was quite popular in the analog days.  Once digital filters, specifically FIRs, became practical, they fell to disuse.  I had used Dolph-Chebysev even up to the late 1970s together with FIRs.
>
> 73 es Happy New Year
>
> Chen, W7AY
>
>


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