[chuck-users] New to ChucK: can this be done easily?

Stephen D Beck sdbeck at lsu.edu
Sun Jun 10 18:15:41 EDT 2018

This should be very easy. CSV files are common text files, with data separated by commas, hence the name Comma-Separated-Values.  I've never done this before, but it seems like this would be pretty straight forward, and something I should have done!

Let us know how it works.
From: chuck-users-bounces at lists.cs.princeton.edu <chuck-users-bounces at lists.cs.princeton.edu> on behalf of mario.buoninfante <mario.buoninfante at gmail.com>
Sent: Sunday, June 10, 2018 5:08:55 PM
To: Forrest; chuck-users
Subject: Re: [chuck-users] New to ChucK: can this be done easily?


I've never tried to use CSV files with ChucK, an alternative could be use a common txt file with FileIO like you said.
About the interpolation an easy way could be using Step and Envelope to set both freq and amplitude of the oscillators.


Sent from my Wiko ROBBY

On Jun 10, 2018 22:35, Forrest Cahoon <forrest.cahoon at gmail.com> wrote:
Hi ChucKers!

I have a sonification project that I'm wondering if it makes sense to do in ChucK.

I have a csv file with frequencies and amplitudes for 4 different sine waves, representing values at (say) half-second intervals. I want to read in a line, and then smoothly change the frequency and amplitude values using linear interpolation over the course of 24000 samples (a half second at 48k samples per second), then read in the next line, and smoothly change to those values over the next half-second, etc. until the data runs out.

I could code this in C using libsndfile, but if I didn't have to worry about converting frequencies into phase distances between samples I'd consider that a win.

I noticed Chuck has FileIO methods to read input files (although these are very poorly documented) so thought it should be possible to read in a csv file.

I could calculate the amount of frequency and amplitude change per sample and adjust these in a 1-sample loop, and that's already simpler than coding in C. But I'm hoping there's some way to tell ChucK "I want this (e.g. frequency) value to change smoothly from its current value to f1 over the course of a half-second". If that were possible, ChucK would be a clear choice for my project.

Thanks for any response!

Forrest Cahoon

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