Accession Number : AD0268609

Title :   EFFECTS OF TRANSMISSION BAND AND MESSAGE CONTEXT ON SPEECH INTELLIGIBILITY

Descriptive Note : Final rept.

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : PICKETT,J.M.

Report Date : 31 OCT 1961

Pagination or Media Count : 14

Abstract : Measurements were made of the speech intelligibility associated with certain speech contexts and with various frequency ranges of the speech transmission band. Speech contexts of nonsense syllables and of a large set of isolated words showed essentially the same division of importance between high and low speech frequencies. The crossover frequency of equal importance was 1900 cps for nonsense syllablesAND 1700 CPS FOR WORDS. On the other hand, the high speech frequencies were much more important for transmission of words chosen from sets of only two words as contexts. Relationships between intelligibility, size of speech band, and size of message set were also measured. Over a limited range, each doubling of the size of message set required an increase of 1.7 db in the speech bandwidth in order to maintain intelligibility. (Author)

Descriptors :   *INTELLIGIBILITY, *SPEECH REPRESENTATION, *SPEECH TRANSMISSION, DISCRIMINATORS, FREQUENCY ANALYZERS, MEASUREMENT, PITCH DISCRIMINATION, SPEECH

Distribution Statement : APPROVED FOR PUBLIC RELEASE