[PD] biquad and karplus-strong

[cyrille henry]

hello,

i've just read the original article from 1983 describing KS algo, including decay stretching.
as far as i understand, averaging the last 2 sample is a very optimized low pass iir filter at fixed frequency. the decay stretching allow to change the filter cutoff.
now that processing power allow to easily compute filter at different frequency, I would suggest to replace the averaging algo with a simple lop~ filter and experiment with the cutoff frequency.

cheers
c

Le 14/06/2016 15:05, Peter P. a écrit :
> Dear Orm,
>
> * Orm Finnendahl <orm.finnendahl at selma.hfmdk-frankfurt.de> [2016-06-14 12:24]:
>> Hi Peter,
>>
>>   BTW: The patch in the pd tutorial uses [z~ 1] which you can replace
>> with [biquad~ 0 0 0 1 0] and your suggestion to do the averaging in
>> the biquad~ should simplify that patch even more.
>>
>> The probability based polarity change could be done using the attached
>> patch.
> Thank you! This is quite elegant, vanilla Pd and works with a blocksize
> of 1 as well! Did you come up with this or is there another source which
> can be credited?
>
> I am wondering if someone implemented the Karplus' and Strong's 'decay
> stretching' in Pd as well.
>
> best, Peter
>
> _______________________________________________
> Pd-list at lists.iem.at mailing list
> UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
>