[Csnd] new k-rate array operations
| Date | 2014-05-22 10:36 |
| From | Victor Lazzarini |
| Subject | [Csnd] new k-rate array operations |
I have added a few new k-rate array operations to the develop branch in GIT. They include fft, ifft - 1-dim fast fourier transforms on complex data (forward, inverse) rfft, irfft - 1-dim real-to-complex and complex-to-real fast fourier transforms (forward, inverse) window - windowing operation mags, phs - magnitudes and phases from complex data rec2pol, pol2rect - polar-rectangular conversion of complex data r2c, c2r - real to complex (+vice-versa) data format conversion cmplxprod - complex multiplication getrow, getcol - 2-d to 1-d array row/column getters setrow, setcol - 1-d to 2-d array row/column setters shiftin - shifts an audio variable into an array shiftout - shifts data from an array into an audio variable. All of them are in the manual (but examples will need to be added). The FFT and complex data operations are self explanatory. The r2c and c2r conversions basically operate on the real part of complex numbers and are there to facilitate the use of the complex data transforms. The row and column getters/setters are also there to facilitate packing vectors into matrices and extracting vectors from matrices, which is particularly useful to program overlapped operations. shiftin and shiftout are the interfaces with audio data. I guess they can have many uses. For instance, it is possible to set up a delay line with them like this kDel[] init idelsamps aout shiftout kDel kDel shiftin ain which is similar to a delayr, delayw pair. I hope these opcodes become useful. ======================== Dr Victor Lazzarini Senior Lecturer NUI Maynooth, Ireland victor dot lazzarini at nuim dot ie |
| Date | 2014-05-22 11:19 |
| From | jpff@cs.bath.ac.uk |
| Subject | [Csnd] Re: |
| Attachments | None |
| Date | 2014-05-22 11:31 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] |
Not exactly, I think because I assume avar = karr ; means karr has length = ksmps whereas shiftout etc only requires length not to be < ksmps Could we have the assignment as well, as a special case? ======================== Dr Victor Lazzarini Senior Lecturer NUI Maynooth, Ireland victor dot lazzarini at nuim dot ie On 22 May 2014, at 11:19, jpff@cs.bath.ac.uk wrote: > >> shiftin - shifts an audio variable into an array >> shiftout - shifts data from an array into an audio variable. >> >> shiftin and shiftout are the interfaces with audio data. I guess they can have many uses. For instance, it >> is possible to set up a delay line with them like this >> >> kDel[] init idelsamps >> aout shiftout kDel >> kDel shiftin ain >> >> which is similar to a delayr, delayw pair. >> > > Syntctically are these assignments? > > avar = karray > karray = avar > > Would that be easier to use? What do you do if the length of the array is bigger/smaller than ksmps? > > ==John ff > > > > > Send bugs reports to > https://github.com/csound/csound/issues > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" > > > |
| Date | 2014-05-22 19:09 |
| From | joachim heintz |
| Subject | Re: [Csnd] new k-rate array operations |
very exciting! let us know if you need testing or anything similar. many thanks for these new possibilities - j Am 22.05.2014 11:36, schrieb Victor Lazzarini: > I have added a few new k-rate array operations to the develop branch in GIT. They include > > fft, ifft - 1-dim fast fourier transforms on complex data (forward, inverse) > rfft, irfft - 1-dim real-to-complex and complex-to-real fast fourier transforms (forward, inverse) > window - windowing operation > mags, phs - magnitudes and phases from complex data > rec2pol, pol2rect - polar-rectangular conversion of complex data > r2c, c2r - real to complex (+vice-versa) data format conversion > cmplxprod - complex multiplication > getrow, getcol - 2-d to 1-d array row/column getters > setrow, setcol - 1-d to 2-d array row/column setters > shiftin - shifts an audio variable into an array > shiftout - shifts data from an array into an audio variable. > > All of them are in the manual (but examples will need to be added). The FFT and complex data operations > are self explanatory. The r2c and c2r conversions basically operate on the real part of complex numbers and > are there to facilitate the use of the complex data transforms. > > The row and column getters/setters are also there to facilitate packing vectors into matrices and extracting > vectors from matrices, which is particularly useful to program overlapped operations. > > shiftin and shiftout are the interfaces with audio data. I guess they can have many uses. For instance, it > is possible to set up a delay line with them like this > > kDel[] init idelsamps > aout shiftout kDel > kDel shiftin ain > > which is similar to a delayr, delayw pair. > > I hope these opcodes become useful. > ======================== > Dr Victor Lazzarini > Senior Lecturer > NUI Maynooth, Ireland > victor dot lazzarini at nuim dot ie > > > > > > > Send bugs reports to > https://github.com/csound/csound/issues > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" > > > > |
| Date | 2014-05-22 19:50 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] new k-rate array operations |
I'll prepare a few basic examples to get the ball rolling. On 22 May 2014, at 19:09, joachim heintz wrote: > very exciting! let us know if you need testing or anything similar. > many thanks for these new possibilities - > j > > > Am 22.05.2014 11:36, schrieb Victor Lazzarini: >> I have added a few new k-rate array operations to the develop branch in GIT. They include >> >> fft, ifft - 1-dim fast fourier transforms on complex data (forward, inverse) >> rfft, irfft - 1-dim real-to-complex and complex-to-real fast fourier transforms (forward, inverse) >> window - windowing operation >> mags, phs - magnitudes and phases from complex data >> rec2pol, pol2rect - polar-rectangular conversion of complex data >> r2c, c2r - real to complex (+vice-versa) data format conversion >> cmplxprod - complex multiplication >> getrow, getcol - 2-d to 1-d array row/column getters >> setrow, setcol - 1-d to 2-d array row/column setters >> shiftin - shifts an audio variable into an array >> shiftout - shifts data from an array into an audio variable. >> >> All of them are in the manual (but examples will need to be added). The FFT and complex data operations >> are self explanatory. The r2c and c2r conversions basically operate on the real part of complex numbers and >> are there to facilitate the use of the complex data transforms. >> >> The row and column getters/setters are also there to facilitate packing vectors into matrices and extracting >> vectors from matrices, which is particularly useful to program overlapped operations. >> >> shiftin and shiftout are the interfaces with audio data. I guess they can have many uses. For instance, it >> is possible to set up a delay line with them like this >> >> kDel[] init idelsamps >> aout shiftout kDel >> kDel shiftin ain >> >> which is similar to a delayr, delayw pair. >> >> I hope these opcodes become useful. >> ======================== >> Dr Victor Lazzarini >> Senior Lecturer >> NUI Maynooth, Ireland >> victor dot lazzarini at nuim dot ie >> >> >> >> >> >> >> Send bugs reports to >> https://github.com/csound/csound/issues >> Discussions of bugs and features can be posted here >> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" >> >> >> >> > > > Send bugs reports to > https://github.com/csound/csound/issues > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" > > > Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie |
| Date | 2014-05-22 20:00 |
| From | Andres Cabrera |
| Subject | Re: [Csnd] new k-rate array operations |
This is great, thanks. It allows more complex algorithm prototyping within the Csound language (for example random phase all-pass filters which I have had to implement partly in python). Are these part of the core? I suspect not, since you probably have a dependency on something like fftw. Cheers,On Thu, May 22, 2014 at 2:36 AM, Victor Lazzarini <Victor.Lazzarini@nuim.ie> wrote: I have added a few new k-rate array operations to the develop branch in GIT. They include |