File:Progression continue octave do3 do4.ogg
Progression_continue_octave_do3_do4.ogg (Ogg Vorbis sound file, length 4.8 s, 15 kbps, file size: 8 KB)
Captions
Summary
[edit]DescriptionProgression continue octave do3 do4.ogg |
English: Continuous progression (glissando) on one octave, from C3 to C4; made with Scilab, converted from WAV to OGG by ffmpeg2theora
Français : Progression continue (glissando) sur une octave, du do3 au do4 ; fait avec Scilab, converti de WAV vers OGG par ffmpeg2theora |
Date | |
Source | Own work |
Author | Christophe Dang Ngoc Chan (cdang) |
Permission (Reusing this file) |
GFDL |
Scilab source
This media was created with Scilab, a free open-source software. Here is a listing of the Scilab source used to create this file. |
clear;
fs = 5000; // frequence d'echantillonnage
// fs = 1000; // lors des tests
duree=4; // duree de l'air en secondes
n=216; // nombre total de marches (18 marches par demi-ton : 1/4 comma)
raison = 2^(1/n); // les notes suivent une suite geometrique
// afin de doubler la frequence a la fin
N = round(duree*fs/n); // nombre de pas par marche
f=264; // do3
// f=50; // lors des tests
son(1)=0;
for i=0:n-1
decalage=i*N;
// raccordement entre les marches
if i==0 then
phase=0;
else
valeur_penultieme=son(decalage-1);
valeur_precedente=son(decalage);
phase=asin(valeur_precedente);
signe=valeur_precedente-valeur_penultieme;
if signe < 0 then
if valeur_precedente < 0 then
phase = -%pi-phase;
else phase = %pi-phase;
end
end
end
for j=1:N
instant=j/fs;
son(decalage+j) = sin(2*%pi*instant*f+phase);
end
f = f*raison;
end
// terminer en decrescendo
taille = max(size(son));
valeur_penultieme=son(taille-1);
valeur_precedente=son(taille);
phase=asin(valeur_precedente)+1/fs;
signe=valeur_precedente-valeur_penultieme;
if signe < 0 then
if valeur_precedente < 0 then
phase = -%pi-phase;
else phase = %pi-phase;
end
end
demi_seconde = round(fs/2);
for i=0:demi_seconde-1
instant = i/fs;
son(i+taille)=sin(2*%pi*instant*f+phase)*(1-i/demi_seconde);
end
// plot(son') // lors des tests
savewave('progression_continue_octave_do3_do4.wav', son', fs)
// wavwrite(son', fs, 'progression_continue_octave_do3_do4') // alternative
Licensing
[edit]Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
| ||
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 12:35, 7 November 2006 | 4.8 s (8 KB) | Cdang (talk | contribs) | {{Information |Description={{en|Continuous progression ''(glissando)'' on one octave, from C3 to C4; made with [http://www.scilab.org/ Scilab], converted from WAV to OGG by ffmpeg2theora}} {{fr|Progression continue ''(glissando)'' sur une octave, du do3 a |
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File usage on Commons
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Transcode status
Update transcode statusFormat | Bitrate | Download | Status | Encode time |
---|---|---|---|---|
MP3 | 96 kbps | Completed 19:44, 22 December 2017 | 1.0 s |
File usage on other wikis
The following other wikis use this file:
- Usage on ca.wikipedia.org
- Usage on fr.wikibooks.org
Metadata
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Software used |
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