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Work item:
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G.191
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Subject/title:
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Software tools for speech and audio coding standardization
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Status:
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Consented on 2026-06-17
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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Rev.
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Equivalent number:
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-
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Timing:
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Not specified (Medium priority)
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Liaison:
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-
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Supporting members:
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-
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Summary:
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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 STL2026, incorporates:
WAV file I/O support with multi-bit-depth (16/24/32-bit) processing for all tools
Extensions to the speech voltmeter (sv56) for arbitrary bit-depth processing
A delay-and-error profile to frame-erasure pattern conversion tool (dlyerr_2_errpat) for jitter buffer emulation (3GPP S4-121077)
An EID for 3GPP AMR bitstreams (eid-amr)
A pseudo-random selection tool (random) for EVS processing scripts (3GPP S4-121078)
SHQ2/SHQ3 half-band and HP50 high-pass FIR filters
P.863/P.863.2 resampling FIR filters for rate-change factors 2, 3, 4 and 6 (as published in ETSI TR 103 138)
A per-band gain verification tool (gain_chk) for codec and speech-processing validation
Cross-platform portability fixes with expanded CTest regression coverage
Recommendation ITU-T G.191 includes an electronic attachment containing STL2026 and manual.
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Comment:
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-
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Reference(s):
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Historic references:
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Contact(s):
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| ITU-T A.5 justification(s): |
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First registration in the WP:
2026-06-22 11:51:02
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Last update:
2026-06-23 10:21:50
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