I've just tested with a file containing a single sine tone. And the result is very audible even on my laptop's internal speakers. Here are the original and the playback (and recorded) results.
https://dl.dropboxusercontent.com/u/47945259/sine.wav https://dl.dropboxusercontent.com/u/47945259/sinePlayedBack.wav
Listen out for the added frequencies after 00':05".
P
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On 28 October 2013 20:35, peiman khosravi peimankhosravi@gmail.com wrote:
Hi William,
Thanks for the suggestions. This is really useful as I didn't know that you can format messages for soundfiler like that.
So I made all of your suggested changes but I'm still getting the funny noisy playback. It sounds almost ring-modulated (e.g. you hear a lower-frequency sideband at around 10 seconds into the file, which isn't in the input file). Here's the recorded output of the patch: https://dl.dropboxusercontent.com/u/47945259/testoutput.wav
Could it be an OS X issue?
Thanks Peiman
PS I've attached the new patch with your suggested changes.
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On 28 October 2013 12:18, William Brent william.brent@gmail.com wrote:
Hi Peiman, I notice a few things:
your soundfile is being truncated to 4000000 samples
you're loading the left channel of your stereo file into both arrays
after calculating the correct frequency for phasor~ to play at normal
speed, you're multiplying by zero.
With 3), maybe you have that there so you can scale the playback speed with a control later. But re: 1 & 2, try a message to soundfiler like this:
read -maxsize 6.24e+06 -resize $1 test_L test_R
That will increase soundfiler's default maxsize so your complete sample can be loaded. Also note that with the "read" command you can list 2 tables to load to with stereo audio files. You had those tables listed in separate messages…with 2 separate "read" calls, soundfiler is starting over each time and has no way of knowing that you want to continue where you left off.
I didn't listen carefully with headphones, but after those changes I didn't hear an obvious difference between tabread4~'s playback of your file vs. my web browser's.
Hope that helps, William
On Sun, Oct 27, 2013 at 9:23 AM, peiman khosravi < peimankhosravi@gmail.com> wrote:
Attached is a simple patch that reads sound file data from an array with tabread4~.
Does someone know why the result is so noisy? Please try with this sound file (96k 24bit): https://dl.dropboxusercontent.com/u/47945259/test.aif.
It sounds like some sort of extreme quantisation noise. But maybe I've missed something in the patch.
I'm on the latest version of pd vanilla on os x 10.7.5.
Many Thanks Peiman
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