SPEECH QUALITY MEASUREMENTS

This paper is concerned with studies being conducted on a modified isopreference method for rating speech communication systems in view of speech quality. The concept of speech quality is studied by subjective measurements in terms of intelligibility and preference. Listening experiments using the forced pair comparison technique have been performed with trained and untrained groups of listeners. Various kinds of speech signals from different systems have been compared with three idealized reference signals using noise in additive and multiplicative form as degradation signals. Different kinds of tests for preference, intelligibility, rank ordering and loudness are reported which were utilized to study several aspects of speech quality.