Accession Number:

ADA025171

Title:

Syntax and Semantics in a Distributed Speech Understanding System

Descriptive Note:

Interim rept.

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Report Date:

1976-01-01

Pagination or Media Count:

8.0

Abstract:

The Hearsay II speech understanding system being developed at Carnegie-Mellon University has an independent knowledge source module for each type of speech knowledge. Modules communicate by reading, writing, and modifying hypotheses about various constituents of the spoken utterance in a global data structure. The syntax and semantics module uses rules productions of four types 1 recognition rules for generating a phrase hypothesis when its needed constituents have already been hypothesized 2 prediction rules for inferring the likely presence of a word or phrase from previously recognized portions of the utterance 3 respelling rules for hypothesizing the constituents of a predicted phrase and 4 postdiction rules for supporting an existing hypothesis on the basis of additional confirming evidence. The rules are automatically generated from a declarative i.e., non-procedural description of the grammar and semantics, and are embedded in a parallel recognition network for efficient retrieval of applicable rules. The current grammar uses a 450- word vocabulary and accepts simple English queries for an information retrieval system. Author

Subject Categories:

  • Information Science
  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE