Summary

Recommendation ITU-T G.191 provides source code for speech and audio processing modules for narrowband, wideband and super-wideband telephony applications. The set includes codecs, filters, noise generators.

This edition introduces changes to Annex A, which describes the ITU-T Software Tools (STL) containing a high-quality, portable C code library for speech processing applications. This release of the STL, also known as STL2024, incorporates:

• BS1770demo improvements:

– a new RMS option disabling the gating function for background noise measurement,

– the handling of the edge case where all gating blacks are below -70 LKFS,

– improved reporting with scaling factor being reported in the linear and log domains.

• WMC Tools updates:

– New command line parameter to allow control on the number of frames per second (default still 50)

– Export information on all memory allocations occurring during runtime

– Example script for graphical analysis and profiling of dynamic memory allocation

– Bugs fixes and code improvements

Recommendation ITU-T G.191 includes an electronic attachment containing STL2024 and manual.