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Audio MOS speech quality

Delivering a superior user experience and clear audio is essential for effective customer communication.

What is MOS?

Mean Opinion Score (MOS):
MOS is a numerical measure that represents the average of all users' ratings of the quality of a voice service. 
Key aspects
  • Subjective and Objective Testing: MOS can be determined in two ways:

    • Subjective Testing: Involves real human listeners rating the quality of audio samples. While it's accurate, it's also time-consuming, expensive, and not feasible for real-time monitoring.

    • Objective Testing: Uses algorithms to predict what the average MOS score would be without requiring human listeners. Algorithms like PESQ (Perceptual Evaluation of Speech Quality) and POLQA (Perceptual Objective Listening Quality Analysis) are widely used.

  • Factors Affecting Speech Quality: Several factors impact the MOS score in a telecommunications context, including:

    • Network Performance: Latency, jitter, and packet loss during transmission can degrade voice quality.

    • Codec Quality: Different codecs compress and decompress audio data, and their efficiency can affect sound quality.

    • Echo and Noise: Background noise and echo can also reduce the clarity and intelligibility of speech.

  • Importance in Communications: High MOS scores are crucial for telecommunications providers as they reflect the user experience. In areas like customer service, clear audio quality is essential for effective communication.

  • Applications: MOS ratings are used by network operators, equipment manufacturers, and service providers to evaluate and improve their systems. They also guide decisions in codec selection, network management, and quality assurance processes.

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