A STUDY OF ACOUSTICAL MULTIPATH SYSTEMS. SECTION IV. DELAY LINE.
Final rept., May 65-Jun 66.
TUFTS UNIV MEDFORD MASS DEPT OF MECHANICAL ENGINEERING
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The investigation of the effects of multiple paths on acoustical signals as related to speech recognition and improvement of signal-to-noise ratios is based on the theory that any multipath system may be considered to introduce redundancies in a basic message. These redundancies in the basic message may be used to select a particular message source from among many by the application of an attention function characteristic of the spatial relationships between the source and the receiving mechanism. The attention function provides a model in which the distributed energy of the original pulse which reached the receiving mechanism along paths of different lengths delayed in time may be reconcentrated in time to a single pulse with an energy greater than that of the initially received pulse, and thus produce a significant increase n in the subjective signal to noise ratio. Subsequent subjective testing was designed to determine the effects of various headphones and signal to noise ratios on speech intelligibility. Author
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