Speech/audio coding, voiceband modems, facsimile terminals and network-based signal processing
(Discontinued on 18 January 2021, see
TSB Circular 295)
MotivationThe objectives of this Question are to maintain existing voice related Recommendations and to undertake new voice related studies.
Concerning maintenance, this Question will cover three broad areas:
- speech, audio and sound coding for conversational and non-conversational audiovisual services;
- all aspects of voiceband modem, facsimile terminal and voiceband signal discrimination;
- signal processing network equipment (SPNE), including network-based speech enhancement devices such as electrical network echo control, acoustic network echo control, automatic level control devices, voice enhancement devices, circuit multiplication equipment (CME) and voice gateways.
The Question will also consider the initiation of new studies on:
- speech and audio coding;
- voiceband signal terminal protocols;
- signal processing functions;
- signal processing network equipment and terminals;
- voice gateways;
- control/coordination of signal processing functionalities;
- interaction aspects.
Study itemsStudy items to be considered include, but are not limited to:
- speech and audio coding algorithms to extend existing ITU‑T speech and audio coding Recommendations or to create new ones such as codecs for voice over LTE;
- how to use open source for maintenance and future audio related standardization projects;
- identification of applications (other than speech transmission) and definition of associated performance requirements for generic voiceband signal discrimination;
- definition of algorithm(s) suitable for generic voiceband signal discrimination meeting the applications and performance requirements;
- study for SPNE/terminals used in next generation networks (SPNE/terminals interworking between GSTN and packet/IP networks);
- specification of functionality, interfaces, performance requirements and functional tests to provide good network performance for transport network equipment when interconnecting various type of networks;
- logic and protocol requirements needed for control and coordination of signal processing functionalities in networks and terminals. Such logic may be used to get the optimal arrangements of signal processing functionalities in the networks and terminals used in a connection, or to configure their parameters for optimum performance;
- functional characteristics and requirements that are necessary for network-based speech enhancement devices (e.g. network and acoustic echo cancellers, automatic level control, automatic listener enhancement, noise reduction) to provide good performance in existing GSTN and emerging ATM/IP and cellular networks;
- interaction between: similar and different SPNE/terminals; SPNE and other voiceband traffic technologies including text telephony; SPNE/terminals and transport systems; and SPNE/terminals in networks that include satellite links.
TasksTasks include, but are not limited to:
- maintenance of existing G-series regarding speech/audio coding and signal processing Recommendations including ITU‑T G.711, G.711.0, G.711.1, G.718, G.719, G.720.1, G.722, G.722.1, G.722.2, G.723.1, G.726, G.727, G.728, G.729 and G.729.1;
- maintain the voice/audio information in the ITU‑T media coding database;
- development of new speech and audio coding Recommendations;
- maintenance of related Recommendations to voiceband signal discrimination and modem/facsimile terminal protocols: ITU‑T F.162, F.163, F.170, F.171, F.182 bis, F.185, F.190, T.4-T.6, T.22-T.24, T.30-T.33, T.35, T.36-T.39, T.42, T.43, T.45, T.503, T.563, V.8, V.8 bis, V.17, V.21, V.22, V.22 bis, V.24, V.27, V.27 bis, V.27 ter, V.29, V.32, V.32 bis, V.34, V.42, V.42 bis, V.43, V.44, V.56 bis, V.56 ter, V.59, V.61, V.70, V.75, V.76, V.80, V.90-V.92, V.110, V.120, V.130, V.150.0, V.150.1, V.151-V.153, V.250-V.254;
- maintenance of related Recommendations to signal processing network equipment and functions: ITU‑T G.160, G.161, G.161.1, G.164, G.165, G.168, G.169, Q50-series, Q.115-series, G.799.1, G.799.2, G.799.3, G.776.1, G.776.4, G.763, G.764, G.765, G.766, G.767, G.768, G.769/Y.1242 and I.733.
An up-to-date status of work under this Question is found in the SG16 work programme
(
http://itu.int/ITU-T/workprog/wp_search.aspx?sp=16&q=7/16).
Relationships
Recommendations:
- ITU‑T G.70x-series, G.710-series, G.720-series, G.760-series, G.799-series, G.160-series, Q.115-series
- ITU‑T H.300-series system Recommendations
- ITU‑T P.800-series
- ITU‑T E.450-series, E.460, F.162, F.163, F.170, F.182bis, F.185, H.225, H.323, H.245, H.248, I.366.2, I.741, T.6, T.22, T.23, T.24, T.31, T.32, T.33, T.35, T.36, T.39, T.66, T.400-series, T.80-series, T.800-series, X.3, X.38 and X.39
- ITU‑T G.108.2, G.114, G.131, G.136, G.173, G.175, G.177, G.827, G.828, P.330, P.340, P.342, P.1010, P.1100, P.1110, P.501, P.502, P.82, P.84, V.18; ITU-R S.1522
Questions:
- All Questions of Study Group 16
Study groups
- ITU‑T SG2 on operational aspects of networks and performance and network management
- ITU‑R SGs 4 and 5 on voice on mixed terrestrial/satellite networks
- ITU‑R SG6 on broadcasting services
- ITU‑T SG9 on speech and audio coding aspects of digital cable systems and IPTV
- ITU‑T SG11 on signalling requirements, protocols, conformance and interoperability
- ITU‑T SG12 for speech and audio coding quality performance assessment and software tools matters
- ITU‑T SG13 on network architecture, speech and audio coding in IMT and IP-based networks, FN and Internetworking
- ITU‑T SG15 on access, core network architecture, and management and control of transport systems and equipment
Other bodies
- ETSI
- 3GPP and 3GPP2
- ISO/IEC JTC 1, CIE, ICC
- IETF