Abstract
The recently developed digital signal processor is a device used for implementing low- to medium-complexity speech coders. It is currently being used in implementing adaptive differential pulse-code modulation (ADPCM) coding, two-band sub-band coding, and four-band sub-band coding. This study was performed to determine optimal parameter values for the two sub-band coders in preparation for their implementation on the digital signal processor and to determine their performance relative to ADPCM. (The actual implementation of the ADPCM and two-band sub-band algorithms are discussed in other papers in Part 2 of this issue of the Bell System Technical Journal.) Performance was judged on the basis of segmental signal-to-noise ratio and a forced-choice, subjective comparison test of the coders. All three coders were simulated at bit rates of 16, 20, 24, 28, and 32 kb/s. The simulations were performed on a laboratory computer.
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