Data to accompany “Evaluation of Spatial Audio Reproduction Methods (Part 2): Analysis of Listener Preference”, J. AES, 2016

Jon Francombe (1), Tim Brookes (1), Russell Mason (1), and James Woodcock (2)

(1) Institute of Sound Recording, University of Surrey, Guildford, Surrey, GU2 7XH, UK.
(2) Acoustic Research Centre, University of Salford, Salford, M5 4WT

This work was supported by the EPSRC Programme Grant S3A: Future Spatial Audio for an Immersive Listener Experience at Home (EP/L000539/1). Details about the data underlying this work, along with the terms for data access, are available from http://dx.doi.org/10.15126/surreydata.00809533.

This data is available under the Creative Commons Attribution-NonCommercial
(CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/legalcode). If you use the data, please cite the following paper:

J. Francombe, T. Brookes, and R. Mason, 2016: Evaluation of Spatial Audio Reproduction Methods (Part 2): Analysis of Listener Preference. Journal of the Audio Engineering Society

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This folder contains the following subdirectories:

-Stimuli: Listening test stimuli & documentation of the “multi-channel reproduction system comparison dataset” generated as part of the S3A project.

Please note: due to restrictions on the use of the data, the sports commentary programme material is not included in this dataset.

-Raw_Results: Contains original results files from the elicitation/preference tests. 
	
	-Preference_Experiment_Results: .txt files for each participant and programme (1: Brass quartet, 2: Pop song, 3: Big band, 4: Jazz group, 5: Sport, 6: Experimental music, 7: Film excerpt). 
The files called results_prog[n]_pair[n].txt have 6 columns, as follows:
		1: Blank
		2: Test page number (i.e. the position in the test that the combination appeared in)
		3: Pair number (specifies the two reproduction methods)
		4: Reproduction method A (1: Headphones, 2: Low quality mono, 3: Mono, 4: Stereo, 5: 5-channel, 6: 9-channel, 7:22-channel, 8: Cuboid)
		5: Reproduction method B
		6: Score (0 to 100. 0 indicates strong preference for A, 50 indicates no preference, 100 indicates strong preference for B)


-Data:
	
	-PreferenceResults_All.mat: a .mat file containing variables:
		-results: the results
		-info: labels for the columns of results: [Subject Experience ProgrammeItem Page Trial StimA StimB Score YesNoScore]
		-textresults: a 6806 x 2 cell array containing each text response (in rows) in the second column with the accompanying results values in the first column.
	
	-Preference_Results_Processed.mat: a .mat file as above but with results processed as described in the paper (i.e. one participant has been removed, the scaled scores have been added, and the comparison order is modified). The info variable describes the results variable: [Subject Experience ProgrammeItem Page Trial StimA StimB Score YesNoScore Standardised_Score]. Also includes labels in repromethods and programmeitems. 

	-ReplicateDesign.mat: a .mat file containing variables:
		-randstate: the state of the Matlab random number generator when the replicate design was created. 
		-thetime: Matlab 'now' value when the replicate design was created (call datestr(thetime) to see a text version)
		-replicates: the stimulus numbers that were repeated. Three repeats in rows, programme items in columns. 

	-circular_error_ratio.mat: a .mat file containing a 7 x 15 matrix (programme items in rows, participants in columns). Each cell is the number of transitivity violations.	

	-Final_Clusters.mat: .mat file containing the final closers and statistics (see J. Francombe, T. Brookes, and R. Mason, 2016: Evaluation of Spatial Audio Reproduction Methods (Part 1): Elicitation of Perceptual Differences. Journal of the Audio Engineering Society)

	-Attributes.mat: a .mat file containing attribute labels and the cluster numbers that contributed to the attributes

	-Attribute_Use_Data.mat: .mat file containing attribute use data in matrix 'attribute_use'. Info variable describes this matrix: [Subtype(1=inexp,2=exp) stimA stimB Score AttributeNumber SubjectNumber]. Also contains the same data in a Matlab table.

	-pct_subjects_used_attributes.mat: .mat file with data on the percentage of participants that used each attribute



-Analysis: This folder contains the following files:
	
	-JF_S3A_AnalysisOfListenerPreference_Analysis.m: a Matlab script (created with MathWorks MATLAB R2014a) for generating the figures in the paper that this dataset accompanies. 
	
	-A directory ‘Functions’ containing some MATLAB functions used in the analysis script



