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rdfs:label
AMR-WB G.722.2 적응 다중 속도 광대역 Adaptive Multi-Rate Wideband
rdfs:comment
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 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。 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. 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:
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Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband
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G.722.2
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dbo:abstract
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 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. 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. 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。
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