Testing Task Force T005:
Characterization of the New ETSI speech codec based on subjective Test
data bases – CNET
Who we are:
STF Leader: Joachim Pomy, Focus Infocom
Gesellschaft für Informatik und Telekommunikation mbH,
STF Experts: Jan Holub, Mesaqin.com s.r.o (Ltd.), firstname.lastname@example.org
Markus Schnell, Fraunhofer Institut für Integrierte Schaltungen IIS, email@example.com
What we do
The subjective and objective methodology for the characterization of the
new ETSI speech codec has been developed in cooperation between TC STQ
and TC DECT. It also specifies the performance requirements for this
TS 103 624 which was developed in that respect provides information on
the characterization methodology and requirements. It describes
experimental tests and conditions to be tested. Additionally, objective
evaluation to be applied is described.
The Low Complexity Communication Codec Plus (LC3plus) which was
developed under the jurisdiction of TC DECT (TS 103 634) will be the new
ETSI codec if it can be characterized according to the requirements
specified in TS 103 624 with the intention to be able to standardize a
high-quality codec for the use in modern telecommunication networks,
including but not limited to DECT and VoIP. A special focus is paying
tribute to the fact that end-to-end connections, i.e. from user to user,
are in many cases of a hybrid nature concatenating different
technologies and thus tandeming different codecs.
The work to be performed in this project is to create a set of
high-quality recordings for the codec tandeming scenarios stipulated by
TS 103 624 (test sequences) and conduct a statistically sufficiently
large number of auditory tests (subjective tests).
There are 2 main tasks to be completed:
• creation of a set of test sequences
• conducting and analysing subjective tests.
For more details, see our Terms
Why we do it
The candidate codec has been contributed in the DECT community and in
order to give the markets also outside this community the certainty that
this codec can be used with confidence in maintaining high speech
quality under all circumstances or formal charachterization is
How we do it
Due to current situation, the TTF experts are working remotely from
their locations (Germany, Czech Republic). The subjective tests will be
performed in MESAQIN.com listening laboratory premises in Prague using
native English and Mandarin speakers.
The following detailed information will be added to TS 103 624:
• Characterization Methodology and Requirement
Specifications for the ETSI LC3plus codec
• Results from Characterization Testing of the ETSI
After approval by ETSI STQ, the revised version(s) of TS 103 624 will be
available to the general public.
STQ approval is scheduled for end of September 2021.
If additional information is needed, please send an email to firstname.lastname@example.org