Title :
A 400-BPS Vocoder using Line Spectral Frequencies and Frame Repeat Coding
Author :
Kowalski, John M. ; Schoepflin, Robert W.
Author_Institution :
Research Engineer, Hazeltine Research Labs, Cuba Hill Road, Greenlawn, New York 11740, (516) 261-7000, Ext 3566
Abstract :
A 400-bps vocoder utilizing frame repeat vector quantization is described that is designed to be used with fixed data rate systems. It combines several improvements over existing 400-bps systems. Line spectrum frequency parameters are vector quantized using a perceptually meaningful distortion metric. Frames to be repeated are determined from a buffer´s length of data, which determines the coding delay. Excitation parameters are trellis coded using a variable lookahead approach to minimize throughput delay.
Keywords :
Data engineering; Delay; Design engineering; Filters; Frequency; Linear predictive coding; Reflection; Speech coding; Vector quantization; Vocoders;
Conference_Titel :
Military Communications Conference - Communications-Computers: Teamed for the 90's, 1986. MILCOM 1986. IEEE
DOI :
10.1109/MILCOM.1986.4805791
