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3gpp ts 26.441, 26.442 Enhanced Voice Services ( EVS ) is a superwideband speech audio coding standard that was developed for VoLTE and VoNR . It offers up to 20 kHz audio bandwidth and has high robustness to delay jitter and packet losses due to its channel aware coding [ 1 ] and improved packet loss concealment. [ 2 ]
This codec is mandated in 3GPP networks that are capable of 16 kHz sampling. [46] In addition, many carriers and devices can use Enhanced Voice Services (EVS). This is an up to superwideband (20–16,000 Hz) or fullband (20–20,000 Hz) codec backwards-compatible with AMR-WB. [47]
AMR-WB was developed by Nokia [1] and VoiceAge and it was first specified by 3GPP. [2] AMR-WB is codified as G.722.2, an ITU-T standard speech codec, formally known as Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB). G.722.2 AMR-WB is the same codec as the 3GPP AMR-WB.
The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding.AMR is a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality [3] speech starting at 7.4 kbit/s.
3GPP / TISPAN IMS architectural overview 3GPP / TISPAN IMS architectural overview – HSS in IMS layer (as by standard) Each of the functions in the diagram is explained below. The IP multimedia core network subsystem is a collection of different functions, linked by standardized interfaces, which grouped form one IMS administrative network. [7]
The 3rd Generation Partnership Project (3GPP) is an umbrella term for a number of standards organizations which develop protocols for mobile telecommunications. Its best known work is the development and maintenance of: [ 1 ]
Extended Adaptive Multi-Rate – Wideband (AMR-WB+) is an audio codec that extends AMR-WB.It adds support for stereo signals and higher sampling rates. Another main improvement is the use of transform coding (transform coded excitation – TCX) additionally to ACELP.
Parts of the HE-AAC specification had previously been standardized and published by various bodies in 3GPP TS 26.401, [7] ETSI TS 126 401 V6.1.0, [8] ...