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ITU-T G.729.1 (05/2006)
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ITU-T G.729.1 (05/2006)
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Codeur intégré à débit variable basé sur le vocodeur G.729: Codeur à flux binaire modulable à large bande à 8-32 kbit/s interopérable avec le codeur G.729
La présente Recommandation décrit un algorithme échelonnable de codage audio et de parole de 8 à 32 kbit/s interopérable avec G.729, G.729A et G.729B.La sortie du codeur G.729EV a une bande passante de 50-4000 Hz à 8 et 12 kbit/s et 50-7000 Hz de 14 à 32 kbit/s. A 8 kbit/s, G.729EV est pleinement interopérable avec G.729, Annexe A/G.729 et Annexe B/G.729. On en prévoit donc un développement efficace dans les infrastructures VoIP existantes fondées sur G.729. Le codeur fonctionne sur des trames de 20 ms et a un délai algorithmique de 48,9375 ms. Par défaut, l'entrée du codeur et la sortie du décodeur sont échantillonnées à 16 kHz.Le codeur produit un flux binaire incorporé structuré en 12 couches correspondant aux 12 débits binaires disponibles de 8 à 32 kbit/s. Le flux binaire peut être tronqué du côté du décodeur ou par tout composant du système de communication pour ajuster "au vol" le débit binaire à la valeur désirée sans qu'il soit besoin de signalisation hors bande.
L'algorithme sous-jacent se fonde sur une structure de codage à trois étapes: prédiction linéaire avec excitation par code (CELP, code-excited linear prediction) incorporé de la bande inférieure (50-4000 Hz), le codage paramétrique de la bande supérieure (4000-7000 Hz) par extension de largeur de bande en domaine temporel (TDBWE, time-domain bandwidth extension), et l'amélioration de la bande complète (50-7000Hz) par une technique de codage à transformation prédictive connue sous le nom d'annulation de crénelage de domaine temporel (TDAC, time-domain aliasing cancellation).
L'Amendement 1 introduit la nouvelle Annexe A qui contient le format de charge utile RTP ainsi que les identificateurs et paramètres de capacité pour la signalisation des capacités G.729.1 fondée sur H.245. Le format et les paramètres de capacité sont totalement compatibles avec les définitions correspondantes de la charge utile RTP de la Rec. UIT-T G.729.1, de manière à assurer une interopérabilité continue. En plus de la nouvelle Annexe, l'Amendement 1 de la Rec. UIT-T G.729.1 contient les modifications qu'il est nécessaire d'apporter pour corriger les erreurs relevées dans la Rec. UIT-T G.729.1 ainsi que de nouveaux vecteurs d'essai plus détaillés.
L'Amendement 2 introduit la nouvelle Annexe B qui définit une autre implémentation de l'algorithme G.729.1 en virgule flottante, à utiliser sur un matériel DSP optimisé pour les opérations en virgule flottante. Le code C associé en virgule flottante est entièrement compatible avec le code C en virgule fixe.
Citation:
https://handle.itu.int/11.1002/1000/8825
Series title:
G series: Transmission systems and media, digital systems and networks
G.700-G.799: Digital terminal equipments
G.710-G.729: Coding of voice and audio signals
Approval date:
2006-05-29
Provisional name:
G.729EV
Approval process:
AAP
Status:
In force
Observation:
This edition includes the modifications introduced by G.729.1 (2006) Amd.1 approved on 13 January 2007 and G.729.1 (2006) Amd.2 approved on 13 February 2007. See G.729.1 (2006) Corrigendum 1 (2009) for the latest version of the ANSI C code for this item and its Amendments.1 and 2
Maintenance responsibility:
ITU-T Study Group 16
Further details:
Patent statement(s)
Development history
Associated test signals
Editions
Related Supplement(s)
Related technical papers and reports
Ed.
ITU-T Recommendation
Status
Summary
Table of Contents
Download
1.9
G.729.1 (2006) Amd. 8 (03/2013)
In force
here
-
here
1.8
G.729.1 (2006) Amd. 7 (02/2012)
In force
here
here
here
1.7
G.729.1 (2006) Amd. 6 (03/2010)
In force
here
here
here
1.6
G.729.1 (2006) Cor. 1 (08/2009)
In force
here
here
here
1.5
G.729.1 (2006) Amd. 5 (12/2008)
In force
here
here
here
1.4
G.729.1 (2006) Amd. 4 (06/2008)
In force
here
here
here
1.3
G.729.1 (2006) Amd. 3 (08/2007)
In force
here
here
here
1.2
G.729.1 (2006) Amd. 2 (02/2007)
In force
here
here
here
1.1
G.729.1 (2006) Amd. 1 (01/2007)
In force
here
here
here
1
G.729.1 (05/2006)
In force
here
here
here
ITU-T Supplement
Title
Status
Summary
Table of contents
Download
G Suppl. 4 (12/1972)
Certain methods of avoiding the transmission of excessive noise between interconnected systems
In force
-
-
here
G Suppl. 5 (10/1984)
Measurement of the load of telephone circuits under field conditions
In force
-
-
here
G Suppl. 7 (12/1972)
Loss-frequency response of channel-translating equipment used in some countries for international circuits
In force
here
here
here
G Suppl. 8 (12/1972)
Method proposed by the Belgian telephone administration for interconnection between coaxial and symmetric pair systems
In force
-
-
here
G Suppl. 17 (10/1984)
Group-delay distortion performance of terminal equipment
In force
-
-
here
G Suppl. 19 (10/1984)
Digital crosstalk measurement (method used by the Administrations of France, the Netherlands and Spain)
In force
-
-
here
G Suppl. 22 (10/1984)
Mathematical models of multiplex signals
In force
-
-
here
G Suppl. 26 (10/1984)
Estimating the signal load margin of FDM wideband amplifier equipment and transmission systems
In force
-
-
here
G Suppl. 27 (10/1984)
Interference from external sources
In force
-
-
here
G Suppl. 28 (10/1984)
Application of transmultiplexers, FDM codecs, data-in-voice (DIV) systems and data-over-voice (DOV) systems during the transition from an analogue to a digital network
In force
-
-
here
G Suppl. 32 (11/1988)
Transfer of alarm information on 60-channel transmultiplexing equipment
In force
-
-
here
G Suppl. 34 (11/1988)
Temperature in underground containers for the installation of repeaters
In force
-
-
here
G Suppl. 35 (11/1988)
Guidelines concerning the measurement of wander
In force
-
-
here
G Suppl. 36 (11/1988)
Jitter and wander accumulation in digital networks
In force
-
-
here
G Suppl. 39 (02/2016)
Optical system design and engineering considerations
In force
here
here
here
G Suppl. 40 (10/2018)
Optical fibre and cable Recommendations and standards guideline
In force
here
here
here
G Suppl. 41 (02/2018)
Design guidelines for optical fibre submarine cable systems
In force
here
here
here
G Suppl. 42 (10/2018)
Guide on the use of the ITU-T Recommendations related to optical fibres and systems technology
In force
here
here
here
G Suppl. 43 (02/2011)
Transport of IEEE 10GBASE-R in optical transport networks (OTN)
In force
here
here
here
G Suppl. 44 (06/2007)
Test plan to verify B-PON interoperability
In force
here
here
here
G Suppl. 45 (09/2022)
Power conservation in optical access systems
In force
here
here
here
G Suppl. 46 (05/2009)
G-PON interoperability test plan between optical line terminations and optical network units
In force
here
here
here
G Suppl. 47 (09/2012)
General aspects of optical fibres and cables
In force
here
here
here
G Suppl. 48 (06/2010)
10-Gigabit-capable passive optical networks: Interface between media access control with serializer/deserializer and physical medium dependent sublayers
In force
here
here
here
G Suppl. 49 (09/2020)
Rogue optical network unit (ONU) considerations
In force
here
here
here
G Suppl. 50 (09/2011)
Overview of digital subscriber line Recommendations
In force
here
here
here
G Suppl. 51 (06/2017)
Passive optical network protection considerations
In force
here
here
here
G Suppl. 52 (09/2012)
Ethernet ring protection switching
In force
here
here
here
G Suppl. 53 (12/2014)
Guidance for Ethernet OAM performance monitoring
In force
here
here
here
G Suppl. 54 (07/2015)
Ethernet linear protection switching
In force
here
here
here
G Suppl. 55 (12/2023)
Radio-over-fibre (RoF) technologies and their applications
In force
here
here
here
G Suppl. 56 (02/2016)
OTN transport of CPRI signals
In force
here
here
here
G Suppl. 57 (07/2015)
Smart home profiles for 6LoWPAN devices
In force
here
here
here
G Suppl. 58 (12/2023)
Optical transport network module framer interfaces
In force
here
here
here
G Suppl. 59 (02/2018)
Guidance on optical fibre and cable reliability
In force
here
here
here
G Suppl. 60 (09/2016)
Ethernet linear protection switching with dual node interconnection
In force
here
here
here
G Suppl. 62 (02/2018)
Gfast certification
In force
here
here
here
G Suppl. 64 (02/2018)
PON transmission technologies above 10 Gb/s per wavelength
In force
here
here
here
G Suppl. 65 (10/2018)
Simulations of transport of time over packet networks
In force
here
here
here
G Suppl. 66 (09/2020)
5G wireless fronthaul requirements in a passive optical network context
In force
here
here
here
G Suppl. 67 (07/2019)
Application of optical transport network Recommendations to 5G transport
In force
here
here
here
G Suppl. 68 (12/2023)
Synchronization operations, administration and maintenance requirements
In force
here
here
here
G Suppl. 69 (09/2020)
Migration of a pre-standard network to a metro transport network
In force
here
here
here
G Suppl. 70 (09/2020)
Supplement on sub 1 Gbit/s services transport over optical transport network
In force
here
here
here
G Suppl. 71 (12/2023)
Optical line termination capabilities for supporting cooperative dynamic bandwidth assignment
In force
here
here
here
G Suppl. 72 (04/2021)
Modelling consideration for optical media networks
In force
here
here
here
G Suppl. 73 (10/2021)
Influencing factors on quality of experience for multiview video (MVV) services
In force
here
here
here
G Suppl. 74 (12/2021)
Network slicing in a passive optical network context
In force
here
here
here
G Suppl. 75 (12/2021)
5G small cell backhaul/midhaul over TDM-PON
In force
here
here
here
G Suppl. 76 (12/2021)
Optical transport network security
In force
here
here
here
G Suppl. 77 (06/2022)
Supplement 77 to ITU-T G-series of Recommendations - Influencing factors on quality of experience (QoE) for video customized alerting tone (CAT) and video customized ringing signal (CRS) services
In force
here
here
here
G Suppl. 78 (09/2022)
Use case and requirements of fibre-to-the-room for small business applications
In force
here
here
here
G Suppl. 79 (12/2023)
Latency control and deterministic capability over a PON system
In force
here
here
here
Title
Approved on
Download
Roadmap for QoS and QoE in the ITU-T Study Group 12 context (TR-RQ)
2023
here
Considerations on the use of GNSS as a primary time reference in telecommunications
2020
here
Use of G.hn in industrial applications
2020
here
Practical procedures for subjective testing
2011
here
ISDN field trial guidelines
1991
here
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