Abstract
It is well known that binaural processing is very useful for separating incoming sound sources as well as for improving speech intelligibility in reverberant environments. This chapter describes and compares a number of ways in which automatic-speech-recognition accuracy in difficult acoustical environments can be improved through the use of signal processing techniques that are motivated by our understanding of binaural perception and binaural technology. These approaches are all based on the exploitation of interaural differences in arrival time and intensity of the signals arriving at the two ears to separate signals according to direction of arrival and to enhance the desired target signal. Their structure is motivated by classic models of binaural hearing as well as the precedence effect. We describe the structure and operation of a number of methods that use two or more microphones to improve the accuracy of automatic-speech-recognition systems operating in cluttered, noisy, and reverberant environments. The individual implementations differ in the methods by which binaural principles are imposed on speech processing, and in the precise mechanism used to extract interaural time and intensity differences. Algorithms that exploit binaural information can provide substantially improved speech-recognition accuracy in noisy, cluttered, and reverberant environments compared to baseline delay-and-sum beamforming. The type of signal manipulation that is most effective for improving performance in reverberation is different from what is most effective for ameliorating the effects of degradation caused by spatially-separated interfering sound sources.
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Acknowledgements
Preparation of this manuscript was partially supported by grants from Honeywell, Google, and Afeka University. A. Menon has been supported by the Prabhu and Poonam Goel Graduate Fellowship Fund and the Jack and Mildred Bowers Scholarship in Engineering. R. Stern is deeply grateful to the many mentors, colleagues, and friends in the binaural-hearing and speech-recognition communities that have informed this analysis, including especially H. S. Colburn, C. Trahiotis, B. Raj, and R. Singh. The authors also thank E, Gouvêa, C. Kim, A. Moghimi, H.-M. Park, and T. M. Sullivan for many experimental contributions and general insight into these phenomena. Thanks are further due to two anonymous reviewers for valuable comments and suggestions.
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Stern, R.M., Menon, A. (2020). Binaural Technology for Machine Speech Recognition and Understanding. In: Blauert, J., Braasch, J. (eds) The Technology of Binaural Understanding. Modern Acoustics and Signal Processing. Springer, Cham. https://doi.org/10.1007/978-3-030-00386-9_18
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