scope:

The present document describes the methods for assessment of subjective audio (including speech) quality and speech intelligibility under parallel task condition. This approach can be used to evaluate the perceived listening quality or speech intelligibility in situations which better mimics real operation of the tested telecommunication equipment or algorithm.

The present document describes possible parallel task generation and scenarios, the test design and reference conditions used to evaluate the quality or intelligibility subjectively.

Several parallel task scenarios are covered:

• Physically oriented.

• Mentally oriented.

• Hybrid.