Objective and subjective optimization of APC system performance

System configurations and relative performance results are presented for adaptive predictive coding (APC) systems at 9.6 kb/s based on three different criteria: subjective listening tests; signal-to-quantization noise ratio (SNR); and segmental SNR (SNRseg). The subjectively optimized coder has little granular noise but some spectral distortion and SNR and SNRseg values less than half those of the other two systems. The objectively optimized systems have significant granular noise but a better reproduction of the signal spectrum. Optimization of SNRseg does not lead to the subjectively preferred design.<
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