EVALUATING A MEASUREMENT SYSTEM

Noise-to-mask ratio (NMR) is a perceptual measurement scheme which giv es information about the distance between actual noise and masking thr eshold. It has been shown to be a useful tool in the development and c omparison of perceptual coding schemes. Some ''perceptual experiments' ' carried out with the measurement system as a ''test subject'' are pr esented. The results of these measurements are compared with the resul ts obtained with human listeners.