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Subjective and Objective Rating of Intelligibility of Speech Recordings

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Recordings of test speech and an STIPA modulated noise stimulus were made with several microphone systems placed in various locations in a range of controlled test spaces. The intelligibility of the test speech recordings was determined by a subjective listening test, revealing the extent of differences among the recording systems and locations. Also, STIPA was determined for each physical arrangement, and compared with the intelligibility test scores. The correlation between STIPA and the intelligibility scores was not found to be high in all situations. A computer program was written to determine STIPA in accordance with IEC 60268-16. The result was found to be highly sensitive to the method of determining the modulation transfer function at each modulation frequency, yielding the most accurate result when normalizing by the pre-measured properties of the specific stimulus used.

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