Accession Number:

ADA048633

Title:

Noise Suppression Methods for Robust Speech Processing

Descriptive Note:

Semi-annual technical rept. 1 Apr-30 Sep 1977

Corporate Author:

UTAH UNIV SALT LAKE CITY SCHOOL OF COMPUTING

Personal Author(s):

• Boll, Steven F.

Report Date:

1977-10-01

Pagination or Media Count:

126.0

Abstract:

Robust speech processing in practical operating environments requires effective environmental and processor noise suppression. This report describes the technical findings and accomplishments during this reporting period for the research program funded to develop real time, compressed speech analysis- synthesis algorithms whose performance is invariant under signal contamination. Fulfillment of this requirement is necessary to insure reliable secure compressed speech transmission within realistic military command and control environments. Overall contributions resulting from this research program include the understanding of how environmental noise degrades narrow band, coded speech, development of appropriate real time noise suppression algorithms, and development of speech parameter identification methods that consider signal contamination as a fundamental element in the estimation process. This report describes the current research and results in the areas noise suppression using the SABER algorithm, dual input adaptive noise cancellation using the LMS algorithm, pole-zero parameter estimation and multirate coding and CVSD simulation.

Descriptors:

• *NOISE REDUCTION
• *SIGNAL PROCESSING
• *SPEECH ANALYSIS
• ADAPTIVE SYSTEMS
• AIRCRAFT NOISE
• ALGORITHMS
• ANALYSIS OF VARIANCE
• AUTOCORRELATION
• CODING
• DIGITAL FILTERS
• ERROR ANALYSIS
• GAUSSIAN NOISE
• HELICOPTERS
• NARROWBAND
• POWER SPECTRA
• REAL TIME
• SPEECH COMPRESSION
• SPEECH TRANSMISSION
• SUPPRESSION

Subject Categories:

• Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE