The Investigation and Simulation of Dynamic, Interactive Displays of Acoustic Signals.
Annual summary rept. 1 Jul 70-30 Jun 71,
COMPUTER IMAGE CORP DENVER COLO
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Twenty-four psychological tests were conducted to evaluate the potential of animated visual displays for assisting subjects in learning to recognize and identify acoustic signals. A two-dimensional visual format was used to present the amplitude variations of frequency components comprising the signals over sixteen frequency bands of the audio spectrum. Two types of bandpass filter systems were employed for extracting the frequency information 1 an analog cochlea having electrical properties analogous to the human ear, and 2 a set of 16 bandpass filters having uniform amplitude response characteristics. Results of the tests showed that bisensory presentations of nonredundant visual and auditory stimuli significantly improved the performance of subjects as compared to other modalities tested. Descriptions and block diagrams of the systems for generating the displays are given. A system was completed for generating a quasi three-dimensional display of amplitude variations for 16 spectrum channels over several seconds of immediately preceeding time and is now undergoing tests. These tests indicate that this time history display is superior to the two-dimensional format for portraying auditory information in the visual domain. A block diagram and a description of the system is given. Author
- Anatomy and Physiology
- Acoustic Detection and Detectors