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2010-09-23T19:32:43Z

Created page with "= Tue Oct 6, 2009 = * Review Command-line imagemagick assignment from last week * "Audio Loops" Intro / "Hands-on" digital audio == Audio loops & "cat" ups == Check out t..."

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= Tue Oct 6, 2009 =
* Review Command-line imagemagick assignment from last week
* "Audio Loops" Intro / "Hands-on" digital audio

== Audio loops & "cat" ups ==

Check out the [[Sox | sox]] cookbook page.

=== Create your tones ===

Start by using sox to generate some "building block" sounds.

Convert each sound to a "raw" file to be manipulated by Python.
<source lang="text">
sox source.wav --rate 44100 --bits 16 --channels 2 --encoding signed-integer source.raw
</source>

=== Use Python Loops as a "Sequencer" ===

<source lang="python">
from os import system

for i in range(3):
system("cat 01.raw >> song.raw")
system("cat 03.raw >> song.raw")

system("sox --rate 44100 --bits 16 --channels 2 --encoding signed-integer song.raw song.wav")
system("rm song.raw")
system("play song.wav")
</source>

Example of "sequential loops":

<source lang="python">
from os import system

for i in range(3):
system("cat 01.raw >> song.raw")
system("cat 03.raw >> song.raw")

for i in range(3):
system("cat 02.raw >> song.raw")
system("cat 04.raw >> song.raw")

system("sox --rate 44100 --bits 16 --channels 2 --encoding signed-integer song.raw song.wav")
system("rm song.raw")
system("play song.wav")
</source>

Example of a "nested loop":

<source lang="python">
from os import system

for i in range(3):
system("cat 01.raw >> song.raw")
system("cat 03.raw >> song.raw")

for i in range(3):
system("cat 02.raw >> song.raw")
system("cat 04.raw >> song.raw")

# print("goodbye")

system("sox --rate 44100 --bits 16 --channels 2 --encoding signed-integer song.raw song.wav")
system("rm song.raw")
system("play song.wav")
</source>

=== Finding open-licensed audio online ===
* [http://librivox.org/ LibriVox] is a site that encourages volunteers to record spoken-language versions of open-license texts (drawn from [http://www.gutenberg.org/ Project Gutenberg]), Multilingual
* The [http://www.archive.org/ Internet Archive] has sections for [http://www.archive.org/details/audio audio] and [http://www.archive.org/details/etree live music].
* [http://www.freesound.org/ The Freesound Project] is a collaborative database of Creative Commons licensed sounds. Freesound focusses only on sound, not songs.

[http://librivox.org/short-science-fiction-collection-24/ sample source]
* http://en.wikipedia.org/wiki/Arpeggiator

=== Assignment for next week ===

Produce a "song" using sox & python loops. Produce two "songs", one with "sequential loops", and one with a nested loop.
<br />
* [[Syllabus 20091006 Loredana | Loredana]]
<br />
* [[Syllabus 20091006 Emanuele | Emanuele]]
* [[User:Farrah Shakeel/Assignments1/sox | Farrah]]
* [[Syllabus 20091006 Bernhard | Bernhard]]
* [[User:Birgit Bachler/techday02 | Birgit]]
* [[User:Megan Hoogenboom/song | Megan]]
* [[Syllabus 20091006 Selena | Selena]]
* [[User:Albert Jongstra/technicalcourse | Albert]]
* [[Syllabus 20091006 hopeless | Kenny]]
* [[User:Renee Oldemonnikhof/technicalcourse | Renee]]
* [[Syllabus 20091006 Ozalp | Ozalp]]

== Attachments ==

*[[File:Syllabus_20091006_loop.wav]]

Syllabus 20091006 - Revision history

Migratebot: Created page with "= Tue Oct 6, 2009 = * Review Command-line imagemagick assignment from last week * "Audio Loops" Intro / "Hands-on" digital audio == Audio loops & "cat" ups == Check out t..."