Accession Number:

AD0637878

Title:

A STUDY OF ACOUSTICAL MULTIPATH SYSTEMS. SECTION IV. DELAY LINE.

Descriptive Note:

Final rept., May 65-Jun 66.

Corporate Author:

TUFTS UNIV MEDFORD MASS DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1966-06-01

Pagination or Media Count:

19.0

Abstract:

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

Subject Categories:

  • Electrical and Electronic Equipment
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE