[PD] tabread2~ noisy output

[William Brent]

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;
>
>
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-- 
William Brent
www.williambrent.com

“Great minds flock together”
Conflations: conversational idiom for the 21st century

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