Adaptive Multi-Rate Wideband (AMR-WB) is a patented wideband speech audio coding standard developed based on Adaptive Multi-Rate encoding, using a similar methodology to algebraic code-excited linear prediction (ACELP).

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. [4]

2021年8月10日 · The AMR-WB bitrates are 6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 and 23.85 kbps. Compared to narrowband speech codecs (like AMR) optimized for traditional telephone voice quality of 300-3400 Hz, the AMR-WB codec's wider bandwidth of 50-7000 Hz provides excellent speech quality.

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. This greatly improves the generic audio coding.

Developed jointly by Ericsson, Nokia and VoiceAge, the AMR-WB+ (Extended Adaptive Multi-Rate Wideband) speech and audio codec is the 3GPP-recommended hi-fi audio codec for MMS, PSS and MBMS services over GSM and WCDMA networks. It …

AMR-WB is the required codec in GSM and WCDMA networks for wideband speech and for multimedia services when wideband speech (with 16 kHz sampling frequency) is supported – including Multimedia Messaging Service (MMS), IMS Messaging and Presence services, Packet-Switched Streaming (PSS), Multimedia Broadcast/Multicast Service (MBMS) and Push ...

2020年7月9日 · AMR-WB: Unlike AMR_NB, the speech bandwidth of Adaptive Multi-rate wide band is 50–7000 Hz. AMR-WB is said to be a patented wideband speech audio coding standard algorithm and uses ACELP technology. The Sample frequency of AMR is 8 kHz/13-bit which is filtered to 200–3400 Hz.

Significant milestones include the introduction of the enhanced full-rate codec (EFR) and the Adaptive Multirate (AMR) voice codec, which increased voice quality and boosted channel error robustness and capacity.

2022年3月14日 · “AMR-WB”全称为“Adaptive Multi-rate - Wideband”，即“自适应多速率宽带编码”，采样频率为16kHz，是一种同时被国际标准化组织ITU-T和3GPP采用的宽带语音编码标准，也称 为G722.2标准。 AMR-WB提供语音带宽范围达到50～7000Hz，用户可主观感受到话音比以前更加自然、舒适和易于分辨。 二、编码方式. 1. AMR-NB: AMR 一共有16种编码方式， 0-7对应8 …

2021年8月10日 · Format Description for AMR-WB+ -- Audio data compression scheme optimized for speech coding in GSM (Global System for Mobile Communications) and UMTS (Universal Mobile Telecommunications System). AMR-WB+ is backward compatible with AMR-WB.