2400- TO 800-B/S LPC (Linear Predictive Coder) Rate Converter.
NAVAL RESEARCH LAB WASHINGTON DC
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This report presents a means for achieving an 800-bits per second bs speech communication capability by redigitizing the linear predictive coefficients present in the 2400-bs data stream produced by the narrowband transmitter currently under development by the Department of Defense and private industry. The 2400- to 800-bs 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-bs 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
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