Table of Contents
1Scope
2Normativereferences
3Definitionsandabbreviations
4Sendingcharacteristics
4.1Sendingloudnessrating
4.2Sensitivityfrequencyresponse
4.3Noise
4.4Harmonicdistortion
4.5Out-of-bandsignals
5Receivingcharacteristics
5.1Receivingloudnessrating
5.2Sensitivityfrequencyresponse
5.3Noise
5.3.1A-weighted
5.3.2Third-octavebandspectrum
5.4Harmonicdistortion
5.5Out-of-bandsignals
6Echopathlosscharacteristics
6.1Terminalcouplingloss
6.1.1Hands-freefunction
6.1.2Loudspeakingfunction
6.2Stabilityloss
7Delay
AnnexATestmethods
A.1Electricalinterfacespecifications
A.2Testconditions
A.2.1Testrooms
A.2.2Testarrangement
A.2.3Electroacousticequipment
A.2.4Testsignals
A.2.5Testsignallevels
A.2.6Accuracyofcalibrations
A.3Transmissionrequirementstesting
A.3.1Sensitivityfrequencyresponse
A.3.2Loudnessratings
A.3.3Terminalcouplingloss
A.3.4Stabilityloss
A.3.5Harmonicdistortion
A.3.6Out-of-bandsignals
A.3.7Noise
A.3.8Delay Abstract
Provides audio performance requirements for loudspeaking and hands-free telephony terminals using, in the telephone band (300-3400 Hz), the waveform encoding according to ITU-T Recommendations G.711 (PCM at both 64 kbit/s and 56 kbit/s) and G.726 (ADPCM 32 kbit/s).
