[PD] tabread2~ noisy output

Tue Oct 29 13:36:37 CET 2013

Sorry for making more noise.

Here are two screenshots of the sonogram of the original sample (sine tone)
and the pd playback via tabread2~. It looks and sounds pretty severe! An
artefact of the sample interpolation perhaps?

Thanks
Peiman

[image: Inline images 4]
[image: Inline images 2]

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On 29 October 2013 01:31, peiman khosravi <peimankhosravi at gmail.com> wrote:

> 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 at 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 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;
>>>>
>>>>
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>>>>
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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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