Abstract
The authors present an 800-b/s voice encoding algorithm which is an extension of the 2400-b/s LPC (linear predictive coder). In essence, the 800-b/s voice algorithm is a 2400-b/s LPC with modified parameter encoders. Speech intelligibility of the 800-b/s voice encoding algorithm measured by the diagnostic rhyme test is 91.5 for three male speakers evaluated by impartial listeners not associated with the present R&D effort. This score compares favorably with the 2400-b/s LPC of a few years ago. The factors that most contributed to the high intelligibility are choice of a 20-ms frame, vector quantization of amplitude parameters, and matrix quantization of LSP coefficients, both over two consecutive frames. >
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