2400- TO 800-B/S LPC (Linear Predictive Coder) Rate Converter.
Abstract
This report presents a means for achieving an 800-bits per second (b/s) speech communication capability by redigitizing the linear predictive coefficients present in the 2400-b/s data stream produced by the narrowband transmitter currently under development by the Department of Defense and private industry. The 2400- to 800-b/s rate converter uses a vector quantization scheme to achieve most of the data reduction. This approach makes it possible to interconnect, without user intervention, 2400- and 800-b/s users (although both users would be effectively at the lower rate) via rate converters located somewhere along the link. The intelligibility of the synthesized speech produced by this procedure compares well with other existing very-low-data-rate systems as determined by the Diagnostic Rhyme Test. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 16, 1983
- Accession Number
- ADA129825
Entities
People
- L. J. Fransen
Organizations
- United States Naval Research Laboratory