Oldfield, S. R., and S. P. A. Parker. "Acuity of Sound Localization:
A Topography of Auditory Space. I. Normal Hearing Conditions." Perception
13 (1984a): 581--600.
Oldfield, S. R., and S. P. A. Parker. (1984b). "Acuity of Sound Localization:
A Topography of Auditory Space. II. Pinna Cues Absent." Perception
13 (1984b): 601--617.
Oldfield, S. R., and S. P. A. Parker. (1986). "Acuity of Sound Localization:
A Topography of Auditory Space. III. Monaural Hearing Conditions." Perception
15 (1986): 67--81.
These three studies examine the ability of subjects under different sets
of conditions to localize white noise played through a speaker that varied
in position. The blindfolded subjects pointed a special gun at the perceived
source of sound played in an anechoic chamber over a boom-mounted speaker.
In the first study subjects listened normally; in the second study pinna
cues were removed by inserting individually cast pinnae molds with access
holes to the auditory canal into subjects' ears; and in the third study
monaural conditions were created by inserting "ear defenders" into subjects'
right ears and covering their right ears with fitted earmuffs. These studies
demonstrate the importance of pinna cues for determining elevation and
reducing front/back reversals, and show that elevation discrimination was
good under monaural conditions, but that azimuth discrimination was reduced.
O'Leary, A., and G. Rhodes. "Cross-Modal Effects on Visual and Auditory
Object Perception." Percep. & Psycho. 35 (1984): 565--569.
Using a display that combined a stimulus for auditory stream segregation
with its visually apparent movement analog, these Stanford University researchers
demonstrated cross-modal influences between vision and audition on perceptual
organization. Subjects hearing the same auditory sequence perceived it
as two tones if a concurrent visual sequence was presented that was perceived
as two moving dots, and one tone if a concurrent visual sequence perceived
as a single object was presented.
Oppenheim, Alan V., ed. Applications of Digital Signal Processing.
ISBN 0-13-039115-8. Prentice Hall, 1978.
Collection of papers on DSP applications, A couple of chapters are
dedicated to processing audio signals and speech. The rest is exotic (RADAR,
SONAR, Geophysics) and there is one chapter on digital image processing.