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Adaptive Multi-Rate audio codec - Wikipedia
http://www.en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec#:~:text=The%20Adaptive%20Multi-Rate%20%28AMR%2C%20AMR-NB%20or%20GSM-AMR%29%20audio,with%20toll%20quality%20speech%20starting%20at%207.4%20kbit%2Fs.
How To Fix Amr-nb Codec – Bashogist
https://bashogist.com/en/amr-nb-codec/
Adaptive Multi-Rate Audio Codec (AMR or amr-nb GSM-AMR) is an audio print format optimized for speech encoding. The AMR codec language is a huge multi-rate narrowband codec language that encodes narrowband signals (200-3400 Hz) with variable bitrates from 4.75 to 12.2 kbps, and quality over long distances [3 ] starting at 7.4 kbps.
AMR - Adaptive Multi-Rate Codec File
https://docs.fileformat.com/audio/amr/
The file with .amr extension is an audio data format relevant to Adaptive Multi-Rate audio codec; consists of a multi-rate narrowband speech codec which encodes narrowband signals at 4.75-12.2 kbit/s bit rate with toll quality speech starting at 7.4 kbit/s; uses link adaptation to select from one of eight different bit rates based. AMR File Format
VoiceAge - AMR (Adaptive Multi-Rate) standard
http://www.voiceage.com/AMR-NB.AMR.html
The AMR narrowband codec was standardized by the European Telecommunications Standards Institute (ETSI) and adopted by the 3GPP as the mandatory codec for 2.5G and 3G wireless systems based on the evolved GSM core network (WCDMA, EDGE, GPRS). It was also recently included in the CableLabs® PacketCable™ 2.0 specification.
CODECPRO AMR CODEC - optimized codec solutions for ...
https://codecpro.com/en/codecs/codec_specifications/10/AMR
CODECPRO AMR CODEC 3GPP MANDATORY STANDARD CODEC. AMR was designed to allow transcoder-free connectivity between GSM, US-TDMA and PDC networks; AMR is the 3GPP mandatory standard codec for narrowband speech over GSM, WCDMA, GPRS and EDGE networks. AMR operates at 8 bitrates in the range of 4.75 to 12.2 kbps and was specifically designed to …
AMR, Adaptive Multi-Rate Speech Codec
https://www.loc.gov/preservation/digital/formats/fdd/fdd000254.shtml
Format Description for AMR -- Audio data compression scheme optimized for speech coding, adopted in October 1998 as the standard speech codec by 3GPP (3d Generation Partnership Project) and now widely used in GSM (Global System for Mobile Communications). The AMR bit rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kb/s are based on frames …
Voice Codecs - GL
https://www.gl.com/voice-codecs.html
AMR NB and WB (requires additional license) AMR is the 3GPP mandatory standard codec for narrowband speech and multimedia messaging services over GSM and evolved GSM (WCDMA, GPRS and EDGE) networks. Designed to provide transcoder free connectivity between GSM, US-TDMA and Personal Digital Cellular networks (Japan).
AMR-WB, Adaptive Multi-Rate - Wideband Speech Codec
https://www.loc.gov/preservation/digital/formats/fdd/fdd000255.shtml
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), an elaboration of AMR. Compared to narrowband speech codecs (like AMR) optimized for traditional telephone voice quality of 300-3400 Hz, the AMR-WB …
Voice Codec Options for VoLTE Services - Techplayon
https://www.techplayon.com/voice-codec-options-for-volte-mobile-services/
Codec Name Year of Launch Audio Bandwidth Technology Bitrates; Enhanced Full-Rate (EFR) 1996: Narrow Band: 2G 12.2 Kbps: AMR Narrowband (AMR-NB) 1999: Narrow Band: 3G/4G 4.72- 12.2 Kbps: AMR Wideband (AMR-WB) 2001: Wide Band: HD Voice in 3G/4G: 6.6 – 23.85 Kbps: Extended AMR-WB (AMR-WB+) 2004: Full Band Full HD Voice in 3G/4G 6-48 Kbps: …
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