[PD] tabread2~ noisy output

[peiman khosravi]

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 at gmail.com> wrote:

> Hi Peiman, I notice a few things:
>
> 1) your soundfile is being truncated to 4000000 samples
>
> 2) you're loading the left channel of your stereo file into both arrays
>
> 3) 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 at 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
>>
>>
>> #N canvas 439 22 536 684 10;
>> #X obj 77 213 soundfiler;
>> #X obj 77 113 openpanel;
>> #X obj 62 414 *~;
>> #X obj -8 305 /;
>> #X obj 77 95 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
>> -1;
>> #N canvas 0 22 450 278 (subpatch) 0;
>> #X array test_R 4e+06 float 2;
>> #X coords 0 1 4e+06 -1 200 140 1 0 0;
>> #X restore 214 -69 graph;
>> #X obj 59 549 dac~;
>> #X obj -8 368 phasor~;
>> #X obj 7 248 t b f;
>> #X msg 31 334 0;
>> #X obj -8 281 pack 96000 f;
>> #X obj 16 474 tabread4~ test_L;
>> #X obj 120 474 tabread4~ test_R;
>> #X msg 219 152 read -resize \$1 test_R;
>> #X msg 77 152 read -resize \$1 test_L;
>> #N canvas 0 22 450 278 (subpatch) 0;
>> #X array test_L 4e+06 float 2;
>> #X coords 0 1 4e+06 -1 200 140 1 0 0;
>> #X restore 8 -68 graph;
>> #X obj -8 343 * 0;
>> #X text 28 321 restart;
>> #X connect 0 0 2 1;
>> #X connect 0 0 8 0;
>> #X connect 1 0 14 0;
>> #X connect 1 0 13 0;
>> #X connect 2 0 11 0;
>> #X connect 2 0 12 0;
>> #X connect 3 0 16 0;
>> #X connect 4 0 1 0;
>> #X connect 7 0 2 0;
>> #X connect 8 0 10 0;
>> #X connect 8 1 10 1;
>> #X connect 9 0 7 1;
>> #X connect 10 0 3 0;
>> #X connect 11 0 6 0;
>> #X connect 12 0 6 1;
>> #X connect 13 0 0 0;
>> #X connect 14 0 0 0;
>> #X connect 16 0 7 0;
>>
>>
>> *www.peimankhosravi.co.uk || RSS Feed<http://peimankhosravi.co.uk/miscposts.rss>
>>  || Concert News <http://spectralkimia.wordpress.com/>*
>>
>>
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>>
>
>
> --
> William Brent
> www.williambrent.com
>
> “Great minds flock together”
> Conflations: conversational idiom for the 21st century
>
> www.conflations.com
>
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