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2. Quality Levels. Synthetic Quality (Under 4.8 kbps)Communication Quality (4.8 to 13 kbps)Toll Quality (13 to 64 kbps)Broadcast Quality (Upper than 64 kbps). 3. Test Types. IntelligibilityNaturalnessSubjective (Test by user)Objective (Test by system). 4. First Class Subjective Intelligibilit
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