Summary

This Recommendation provides audio performance requirements for portable digital cordless and mobile handsets. The requirements apply to narrowband systems (3.1 kHz) regardless of a coding algorithm used in the terminal. Associated test methods are also given.

Requirements are specified for the major electro-acoustic performance parameters affecting audio quality, including sending and receiving levels, frequency responses, noise, sidetone, stability, echo path and delay. The requirements given in the Recommendation should ensure satisfactory service quality in a high percentage of installations under normal conditions.