Summary

Appendix II of Recommendation ITU-T G.160 presents an objective methodology for characterizing the basic effect of noise reduction (NR) methods. Three objective measures are specified for characterizing NR solutions. Recommendation target value ranges in specified conditions are given for the measures to serve as basic guidelines for proper functioning of NR methods. Amendment 1 of Recommendation ITU-T G.160 brings corrections and clarifications to the text of Appendix II. Amendment 2 sees the addition of ANSI-C source code and test vectors as an electronic attachment. Some changes have also been made to improve the accuracy of the SNRI metric when the output SNR exceeds approximately 25 dB.