As three-dimensional auditory displays become more prevalent, there will be an increasing need to understand the interactions that can be expected among spatially separated sounds. A two-alternative, forced-choice, adaptive staircase procedure was used to measure the detectability of a 165-ms click-train signal masked by a continuous Gaussian noise, as a function of the spatial separation between the signal and the masker in the free field. Horizontal separations within the horizontal plane and vertical separations within the median plane were examined for low-, mid-, and high-frequency stimuli. Masking was reduced by as much as 18 dB when the signal and masker were separated horizontally. Sizable reductions in masking (6-9 dB) were also observed for vertical separation. The largest reductions in masking were observed for the high-frequency stimuli. The data are compared with the results of headphone-based studies of binaural masking. Implications for the design of auditory displays are considered.
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References
1.
Anderson, T. R., Janko, J. A., and Gilkey, R. H. (1992). An artificial neural network model of human sound localization. Journal of the Acoustical Society of America, 92, 2298 (abstract).
2.
Anderson, T. R., Janko, J. A., and Gilkey, R. H. (1993, September).Using neural networks to model human sound localization. Paper presented at the Conference on Binaural and Spatial Hearing, Dayton, OH.
3.
Cherry, E. C. (1953). Some experiments on the recognition of speech with one and two ears. Journal of the Acoustical Society of America, 22, 61–62.
4.
Colburn, H. S., and Durlach, N. I. (1978). Models of binaural interaction. In E. C. Carterette and M. P. Friedman (Eds.), Handbook of perception, IV (pp. 467–518). New York: Academic.
5.
Doll, T. J., and Hanna, T. E. (1993, September). Information processing performance with virtual auditory displays. Paper presented at the Conference on Binaural and Spatial Hearing, Dayton, OH.
6.
Doll, T. J., Hanna, T. E., and Russotti, J. S. (1992). Masking in three-dimensional auditory displays. Human Factors, 34, 255–265.
7.
Durlach, N. I. (1963). Equalization and cancellation theory of binaural masking-level differences. Journal of the Acoustical Society of America, 35, 1206–1218.
8.
Durlach, N. I., and Colburn, H. S. (1978). Binaural phenomena. In E. C. Carterette and M. P. Friedman (Eds.), Handbook of perception, IV (pp. 365–466). New York; Academic.
9.
Ebata, M., Sone, T., and Nimura, T. (1968). Improvement of hearing ability by directional information. Journal of the Acoustical Society of America, 43, 289–297.
10.
Egan, J. P. (1965). Masking-level differences as a function of interaural disparities in intensity of signal and of noise. Journal of the Acoustical Society of America, 38, 1043–1049.
11.
Feddersen, W. E., Sande., T. T., Teas, D. C., and Jeffress, L. A. (1957). Localization of high-frequency tones.Journal of the Acoustical Society of America, 29, 988–991.
12.
Gilkey, R. H., and Good, M. D. (1993, September). Masking between spatially separated sound sources. Paper presented at the Conference on Binaural and Spatial Hearing, Dayton, OH.
13.
Good, M. D., and Gilkey, R. H. (1992). Masking between spatially separaeed sounds. In Proceedings of the Human Factors Society 36th Annual Meeting (pp. 253–257). Santa Monica, CA: Human Factors and Ergonomics Society.
14.
Hafter, E. R. (1971). Quantitative evaluation of a lateralization model of masking-level differences. Journal of the Acoustical Society of America, 50, 1116–1122.
15.
Jeffress, L. A., Blodgett, H. C., Sande., T. T., and Wood, C. L. III. (1956). Masking of tonal signals. Journal of the Acoustical Society of America, 28, 416–426.
16.
Levitt, H. (1971). Transformed up-down methods in psycho-acoustics. Journal of the Acoustical Society of America, 49, 1180–1190.
17.
McKinley, R. A., and Ericson, M. A. (1989). A real-time digital auditory localization cue synthesize. In Sound Localization by Human Observers Symposium Proceedings (p. 45). Washington, DC; National Academy Press.
18.
McKinley, R. A., Ericson, M. A., and D'Angelo, W. R. (1994). 3-D auditory displays-Development, applications and performance. Aviation, Space, and Environmental Medicine, 65(5, Suppl.), A31–A38.
19.
Middlebrook., J. C., and Green, D. M. (1991). Sound localization by human listeners. Annual Review of Psychology, 42, 135–139.
20.
Neti, C., Young, E. D., and Schneide., M. H. (1992). Neural network models of sound localization based on directional filtering by the pinna. Journal of the Acoustical Society of America, 92, 3140–3156.
21.
Plomp, R. (1976). Binaural and monaural speech intelligibility of connected discourse in reverberation as a function of azimuth of a single competing sound source (speech or noise). Acustica, 34, 200–211.
22.
Saberj, K., Dostal, L., Sadralodabai, T., Bull, V., and Perrott, D. R. (1991). Free-field release from masking. Journal of the Acoustical Society of America, 90, 1355–1370.
23.
Webster, F. A. (1951). The influence of interaural phase on masked thresholds: 1. The role of interaural time-deviation. Journal of the Acoustical Society of America, 23, 452–462.
24.
Wenzel, E. M., Stone, P. K., Fisher, S. S., and Foster, S. H. (1990). A system for three-dimensional acoustic “visualization” in a virtual environment workstation. In Proceedings of the IEEE Visualization 1990 Conference (pp. 329–337). Los Alamitos, CA: IEEE Computer Society.
25.
Wightman, F. L., and Kistler, D. (1989). Headphone simulation of free-field listening: I. Stimulus synthesis. Journal of the Acoustical Society of America, 85,858–867.
26.
Wightman, F. L., and Kistler, D. (1992). The dominant role of low-frequency interaural time differences in sound localization. Journal of the Acoustical Society of America, 91, 1648–1661.
27.
Yost, W. A., and Dolan, D. (1978). Masking-level differences for repeated filtered transients. Journal of the Acoustical Society of America, 63, 1927–1930.
