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GSM-AMR (AMR-NB) Vocoder and Audio Codec (GSM-AMR (AMR …
http://www.gaoresearch.com/products/speechsoftware/other/gsmamr.php
GSM-AMR is a standard adapted by the 3rd Generation Partnership Project (3GPP). It is an Adaptive Multi Rate-Narrow Band (AMR-NB) speech codec. This vocoder is used mainly in 3rd generation mobile telephony devices to compress toll-quality speech at 8000 samples/second. GAO's GSM-AMR codec has eight basic bit rates, 12.2, 10.2, 7.95, 7.40, 6.70 ...
GSM-AMR (AMR-NB) Vocoder - GAO Research
https://www.gaoresearch.com/PDF/GSM_AMR.pdf
GSM-AMR (AMR-NB) Vocoder Product Description GSM-AMR is a standard adapted by the 3rd Generation Partnership Project (3GPP). It is an Adaptive Multi Rate-Narrow Band (AMR-NB) speech codec. This vocoder is used mainly in 3rd generation mobile telephony devices to compress toll-quality speech at 8000 samples/second. GAO's GSM-AMR
AMR, Adaptive Multi-Rate Speech Codec - Library of …
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 …
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 …
GSM Adaptive Multi-Rate (AMR) Codec - vocal.com
https://www.vocal.com/speech-coders/gsm-amr/
GSM AMR. Originally developed by ETSI [ GSM 06.90 ], the Adaptive Multi-Rate (AMR) speech codec is also specified for 3GPP [ TS 26.071] and ITU [ GSM-AMR-WB ]. GSM AMR codec describes the detailed mapping from input blocks of 160 speech samples in 13-bit uniform PCM form to encoded blocks of 95, 103, 118, 134, 148, 159, 204, and 244 bits and ...
GSM Audio Codec: Vocoder: AMR, CELP ... - Electronics …
https://www.electronics-notes.com/articles/connectivity/2g-gsm/audio-codecs-vocoders-amr-celp.php
GSM AMR Codec. The AMR, Adaptive Multi-rate codec is now the most widely used GSM codec. The AMR codec was adopted by 3GPP in October 1988 and it is used for both GSM and circuit switched UMTS / WCDMA voice calls. The AMR codec provides a variety of options for one of eight different bit rates as described in the table below.
CODECPRO AMR-WB+ (EXTENDED AMR-WB) CODEC
https://codecpro.com/en/codecs/codec_specifications/12/AMR-WB
CODECPRO AMR-WB+ (EXTENDED AMR-WB) CODEC 3GPP SPEECH AND AUDIO STANDARD CODEC. The AMR-WB+ speech and audio codec is the 3GPP-recommended hi-fi audio codec for MMS, PSS and MBMS services over GSM and WCDMA networks. AMR-WB+ is also recommended for DVB-H applications.
GSM to AMR - Convert GSM to AMR, Convert GSM ... - amr-mp3.net
http://www.amr-mp3.net/amr/convert-gsm-to-amr.htm
Total Audio MP3 Converter converts GSM files to AMR format. The software is an all in one audio converter that supports more than 90 audio and video files as input, and converts to popular formats such as MP3, WAV, AAC, M4A, OGG, WMA, and AMR. ... AMR was adopted as the standard speech codec by 3GPP in October 1998 and is now widely used in GSM ...
GSM AMR basics | Adaptive Multi Rate | AMR
https://www.rfwireless-world.com/Terminology/GSM-AMR-basics.html
The AMR is based on the fact that in poor C/I: • Speech coding can be decreased in order to improve channel coding • Overall result is an improved voice quality (in terms of FER) • For AMR, the speech and channel coding data rates are dynamically adapted to best fit the current RF channel conditions. AMR consists on a family of codec with different Channel Coding …
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