This Recommendation describes test signals which are applicable for several purposes in telephonometry. A wide variety of test signals is given, starting with low complexity test signals up to test signals with a high degree of complexity incorporating a lot of typical parameters of speech. Besides technical signals such as sine waves or noise, more speech-like signals are described.
ITU-T P.501 AMD 1-2012 history
2012ITU-T P.501 AMD 1-2012 (Pre-Published) Test signals for use in telephonometry Amendment 1