Alistair D. N. Edwards

Learn More
An evaluation of earcons was carried out to see whether they are an effective means of communicating information in sound. An initial experiment showed that earcons were better than unstructured bursts of sound and that musical timbres were more effective than simple tones. A second experiment was then carried out which improved upon some of the weaknesses(More)
Throughout the history of human-computer interface development, one aspect has remained constant: output from computers has been almost entirely visual. A continued and increasing reliance on visual communication has had a disadvantageous effect on users who have visual disabilities. A visual interface is of no use to a user who is completely blind;(More)
A detailed experimental evaluation of earcons was carried out to see whether they are an effective means of communicating information in sound. An initial experiment showed that earcons were better than unstructured bursts of sound and that musical timbres were more effective than simple tones. Musicians were shown to be no better than non-musicians when(More)
This paper describes a method of presenting structured audio messages, earcons, in parallel so that they take less time to play and can better keep pace with interactions in a human-computer interface. The two component parts of a compound earcon are played in parallel so that the time taken is only that of a single part. An experiment was conducted to test(More)
The study of mathematics is all but precluded to most blind students because of the reliance on visual notations. The Lambda System is an attempt to overcome this barrier to access through the development of a linear mathematical notation which can be manipulated by a multimodal mathematical editor. This provides access through braille, synthetic speech and(More)
Graphical buttons are common to almost all interfaces but they are not without problems. One common difficulty is slipping off a button by mistake and not noticing. Sonically-enhanced buttons were designed to overcome this problem and were experimentally evaluated. Timing, error rates and workload measures were used. Error recovery was significantly faster(More)