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Speech Quality Prediction for Voice in Rooms

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The methods for assessment speech quality fall into two classes: subjective and objective methods. This paper includes an overview of selected methods of subjective listening measurements (ACR, DCR, speech intelligibility) recommended by ITU-T, ISO and Polish Standard. and the method of speech transmission quality evaluation called „modified intelligibility test with forced choice” (MIT-FC). The MIT-FC method provides fully automatized measurement of speech intelligibility. The listener’s task is to select on computer monitor which of alternative utterances visually presented was spoken. The computer’s program automatically calculates speech intelligibility and the factor of speech quality. There are two objective methods described in the paper: QE-ARM and the Hougast and Steeneken method (STI, RASTI). The former one is based on the automatic speech recognition. The latter one is recommended by IEC and Polish Standard for assessment of speech quality in rooms. Experiments in which the methods were used are described. The results are compared with RASTI measurements.

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