Iso-Preference Method for Evaluating Speech Transmission Circuits

Abstract

Subjective listening experiments have been conducted to establish a method for determining (1) contours of equal listener preference for a variety of speech transmission conditions in the audio space, and (2) a scale of magnitude of preference between contours based on preference difference thresholds in which the numbers are called TPU's (Transmission Preference Units). The scale is shown to satisfy the transitivity requirement even for widely different transmission conditions. Hence any two conditions with the same TPU number can be predicted to be equal in preference. The method involves only simple AB preference judgments for two brief samples of speech heard consecutively.