ITU-T P.501 PDF

This Recommendation1 describes test signals that 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 many typical parameters of speech. Besides technical signals, such as sine waves or noise, more speech-like signals are described.

The overview of typical applications of the test signals described is a guideline giving general application rules. The detailed description of the application, however, should be found in individual Recommendations describing the measurement procedures for specific applications.

To avoid difficulties when creating the test signals described, all these signals are freely available for download from the ITU-T test signals database: http://www.itu.int/net/itu-t/sigdb/genaudio/Pseries.htm.