ITU-T - International Telecommunication Union/ITU Telcommunication Sector
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ITU-T P.570-2018
Scope
The quality of ambient noise transmission is an important factor@ which significantly contributes to the perceived overall quality of speech. Existing and even more the new generation of terminals@ networks and system configurations including broadband services can be greatly improved with a proper design of terminals and systems in the presence of ambient noise. This Recommendation: ?C provides information about techniques needed for capturing real-world noise environments; ?C outlines methods for preprocessing of signals for artificial noise fields (ANFs); ?C specifies loudspeaker set-ups and a loudspeaker calibration procedure; ?C describes the requirements for laboratory conditions; ?C specifies techniques for assessing ANFs. The ANF established when applying this Recommendation can be used for the evaluation and optimization of terminals and of complex configurations including terminals@ networks and other configurations. The ANF described in this Recommendation is applicable to: ?C objective performance evaluation of terminals in different ambient noise environments; ?C speech-processing evaluation by using the preprocessed speech signal in the presence of ambient noise@ recorded by a terminal; ?C subjective evaluation of terminals by performing conversational tests@ specific double talk tests or talking and listening tests in the presence of ambient noise; ?C subjective evaluation in third party listening tests by recording the speech samples of terminals in the presence of ambient noise.
ITU-T P.570-2018 history
2018ITU-T P.570-2018 Artificial noise fields under laboratory conditions (Study Group 12)