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Title:      Audio Cartography - Rendered Maps (Audio)
Copyright:  2017 University of Oregon
Author:     M. Brittell
License:    Creative Commons Attribution-Share Alike 2.0 Generic (CC-BY-SA 2.0)

This work was funded in part by the National Science Foundation (NSF) Doctoral 
Dissertation Research Improvement (DDRI) Grant #1634086 and the University of 
Oregon (UO) Lewis Family Endowment.

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The audio files in this collection represent spatial data patterns in an 8x8 
grid. The sounds were rendered using a custom Python script that relies on 
functionality from the Pyo library (audioCartography-prepare-renderTrials.py; 
Python, Pyo).  Each auditory map has a duration of 56 seconds, including 
silent pauses after each row (sequential and augmented sequential maps types) or 
full map playback (concurrent map type).

The rendered audio was used to evaluate three temporal conditions: sequential, 
hybrid, and concurrent.  Each data set in the collection is rendered in one
of the three map types.  The filenames consist of the prefix "track" followed 
by the numeric identifier of the data set represented in the file.  

The rendered audio files were edited (Audacity® 2.0.6) to enforce uniformity 
across repeated audio bursts and eliminate any instances of clipping in the 
original waveform.

Each audio file (WAV) includes embedded metadata, and the accompany metadata 
(XML) follows the AES60-2011 standard.

The sequential map type plays a note (constant frequency and duration) for 
each cell of a 8x8 grid of raster data, progressing through the two 
dimensional space in English reading order (left to right, and top to bottom).  
The hybrid condition follows the same reading order through the two dimensional 
space, but also encodes location.  Frequency (low frequencies for grid cells in 
the "south" or bottom of the two dimensional space, high frequencies for cells 
in the "north" or top of the two dimensional space) encodes vertical (row) 
position.  Note rate (slow: single long note in the "west" or left, fast: 
multiple short notes in the "east" or right; each grid cell may have a variable 
number of notes, but has uniform overall duration) encodes horizontal position
(column).  Finally, the concurrent condition renders data across all 
rows in a sweep from east (left) to west (right), encoding location in 
frequency and note rate (as described for the augmented-sequential map 
type).  Additional details of the audio map symbology is available in the 
accompanying "audioCartography-prepare" scripts.

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REFERENCES

Audacity Team. Audacity®, version 2.0.6.  Available: https://audacityteam.org/. 
	Note: The name Audacity® is a registered trademark of Dominic Mazzoni.

Audio Engineering Society. (2011) AES standard for audio metadata - Core audio 
	metadata, AES60-2011. 

Belanger, O. Pyo, version 0.7.9.  Available: 
	http://ajaxsoundstudio.com/software/pyo/

Python Software Foundation. Python Language Reference, version 2.7. Available: 
	http://www.python.org

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