| dbo:abstract |
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). AMR-WB provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz compared to narrowband speech coders which in general are optimized for POTS wireline quality of 300–3400 Hz. AMR-WB was developed by Nokia and VoiceAge and it was first specified by 3GPP. 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 corresponding 3GPP specifications are TS 26.190 for the speech codec and TS 26.194 for the Voice Activity Detector. The AMR-WB format has the following parameters: * Frequency bands processed: 50–6400 Hz (all modes) plus 6400–7000 Hz (23.85 kbit/s mode only) * Delay frame size: 20 ms * Look ahead: 5 ms * AMR-WB codec employs a bandsplitting filter; the one-way delay of this filter is 0.9375 ms * Complexity: 38 WMOPS, RAM 5.3 kilowords * Voice activity detection, discontinuous transmission, comfort noise generator * Fixed point: bit-exact C code * Floating point: under work A common file extension for the AMR-WB file format is .awb. There also exists another storage format for AMR-WB that is suitable for applications with more advanced demands on the storage format, like random access or synchronization with video. This format is the 3GPP-specified 3GP container format, based on the ISO base media file format. 3GP also allows use of AMR-WB bit streams for stereo sound. (en) Le G.722.2 est une norme de compression audio de l'UIT-T (Union internationale des télécommunications). Ce protocole est également normalisé par l'ETSI sous le nom AMR-WB (Adaptive Multi Rate - Wide Band).Ce codec est appelé « large bande » car il permet une bande passante plus grande que celle des téléphones classiques (fixes et mobiles). * Fréquence d'échantillonnage : 16 000 Hz * Bande passante audio : 50 à 7 000 Hz * Débit sur le réseau : de 6,60 à 23,85 kbit/s (fr) AMR-WB（Adaptive Multi-Rate Wideband）は、Adaptive Multi-Rate（AMR）をベースとするマルチレートの広帯域音声符号化方式で、GSMやW-CDMA 方式の第三世代携帯電話、VoLTEで利用される。AMR-WB と区別するため、従来の AMR は AMR-NB（Adaptive Multi-Rate Narrowband）と呼ばれることもある。 同じ仕様は ITU-T が勧告した広帯域音声符号化方式 G.722.2 でも使用されている。 (ja) 적응 다중 속도 광대역(영어: Adaptive Multi-Rate Wideband, 또는 AMR-WB)은 ACELP와 비슷한 방법으로 사용한 AMR 인코딩에 기반해서 개발한 특허된 광대역 음성부호화 표준이다. AMR-WB는 일반적으로 300-3400 Hz의 회선 품질에 최적화된 협대역 음성 코더에 비해 50-7000 Hz의 보다 넓은 음성 대역폭을 통해 향상된 음성 품질을 제공한다. AMR-WB는 노키아와 보이스에이지가 개발하였으며, 3GPP가 처음 규정하였다.AMR-WB는 이전에는 '적응 다중 속도 광대역(AMR-WB)를 이용하여 약 16 Kbit/s의 광대역 음성 부호화'로 불렸으나, ITU-T 표준 음성 코덱인 G.722.2으로서 규정되어 있다. G.722.2 AMR-WB는 3GPP의 AMR-WB와 같은 코덱이다. (ko) |
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http://www.gsacom.com/downloads/pdf/GSA_Mobile_HD_Voice_report_200212.php4 http://www.3gpp.org/ftp/Specs/html-info/26171.htm http://www.3gpp.org/ftp/Specs/html-info/26190.htm http://www.3gpp.org/ftp/Specs/html-info/26194.htm http://www.3gpp.org/ftp/tsg_sa/TSG_SA/TSGS_17/Docs/PDF/SP-020422.pdf http://www.itu.int/itudoc/itu-t/com16/implgd/old/g7222-ig.pdf https://web.archive.org/web/20071013214817/http:/www.voiceage.com/media/WidebandSpeech.pdf https://web.archive.org/web/20080216034113/http:/mobilesociety.typepad.com/mobile_life/2006/12/deep_inside_the.html https://www.itu.int/rec/T-REC-G.722.2 https://www.itu.int/rec/T-REC-G.722.2/ http://www.3gpp.org/ftp/Specs/html-info/26-series.htm |
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Freely available (en) |
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Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (en) |
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dbr:ITU-T |
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G.722.2 (en) |
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(en) |
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August 2018 (en) |
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Le G.722.2 est une norme de compression audio de l'UIT-T (Union internationale des télécommunications). Ce protocole est également normalisé par l'ETSI sous le nom AMR-WB (Adaptive Multi Rate - Wide Band).Ce codec est appelé « large bande » car il permet une bande passante plus grande que celle des téléphones classiques (fixes et mobiles). * Fréquence d'échantillonnage : 16 000 Hz * Bande passante audio : 50 à 7 000 Hz * Débit sur le réseau : de 6,60 à 23,85 kbit/s (fr) AMR-WB（Adaptive Multi-Rate Wideband）は、Adaptive Multi-Rate（AMR）をベースとするマルチレートの広帯域音声符号化方式で、GSMやW-CDMA 方式の第三世代携帯電話、VoLTEで利用される。AMR-WB と区別するため、従来の AMR は AMR-NB（Adaptive Multi-Rate Narrowband）と呼ばれることもある。 同じ仕様は ITU-T が勧告した広帯域音声符号化方式 G.722.2 でも使用されている。 (ja) 적응 다중 속도 광대역(영어: Adaptive Multi-Rate Wideband, 또는 AMR-WB)은 ACELP와 비슷한 방법으로 사용한 AMR 인코딩에 기반해서 개발한 특허된 광대역 음성부호화 표준이다. AMR-WB는 일반적으로 300-3400 Hz의 회선 품질에 최적화된 협대역 음성 코더에 비해 50-7000 Hz의 보다 넓은 음성 대역폭을 통해 향상된 음성 품질을 제공한다. AMR-WB는 노키아와 보이스에이지가 개발하였으며, 3GPP가 처음 규정하였다.AMR-WB는 이전에는 '적응 다중 속도 광대역(AMR-WB)를 이용하여 약 16 Kbit/s의 광대역 음성 부호화'로 불렸으나, ITU-T 표준 음성 코덱인 G.722.2으로서 규정되어 있다. G.722.2 AMR-WB는 3GPP의 AMR-WB와 같은 코덱이다. (ko) 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). AMR-WB provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz compared to narrowband speech coders which in general are optimized for POTS wireline quality of 300–3400 Hz. AMR-WB was developed by Nokia and VoiceAge and it was first specified by 3GPP. The AMR-WB format has the following parameters: (en) |
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Adaptive Multi-Rate Wideband (en) G.722.2 (fr) 적응 다중 속도 광대역 (ko) AMR-WB (ja) |
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