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Characterization of Communications Systems Using a Speechlike Test Stimulus
Conventional objective means of characterizing communications systems are often inadequate. In particular when a system contains nonlinear elements, such as low-bit-rate encoders, some types of speech transducer, active gain control, and echo cancelers, simple steady-state measurements are not sufficient to predict subjective performance. The use of speechlike test stimuli to characterize nonlinear systems is not new, but a new speechlike composite signal is presented which works in conjunction with a new perception-based objective measure to provide a versatile measurement technique. Rigorous subjective validation of the new method has still to be completed, but early results are given which indicate the usefulness of the method to provide a perceptual ranking for communication systems and also as a diagnostic tool.
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