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G.729.1 это 8-32 kbit/s речевой аудиокодек … G.729.1 это 8-32 kbit/s речевой аудиокодек с совместимостью битового потока с G.729, G.729 Annex A и G.729 Annex B. Его официальное название G.729-based embedded variable bit rate codec: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729. Кодек был разработан для предоставления лучшего качества и большей гибкости чем существующий стандарт кодирования речи ITU-T G.729. G.729.1 имеет гибкие параметры битрейта, звуковой полосы и сложности. Также доступны различные режимы кодирования и декодирования, включая поддержку и 8 и 16 kHz входной/выходной частот дискретизации, совместимость с G.729B, и уменьшенную алгоритмическую задержку. Битовый поток G.729.1 разбит на 12 иерархических уровней. Первый уровень (уровень ядра) на 8 /s совместим с форматом G.729. Второй уровень (добавляет 4 kbit/s, в общем 12 kbit/s) это уровень узкополосного кодирования. Третий уровень (2 kbit/s, в общем 14 kbit/s) это уровень расширения полосы. Последующие уровни (по 2 kbit/s) это широкополосные уровни. Выходная полоса частот G.729.1 в пределах 50–4000 Hz на 8 и 12 kbit/s, и 50–7000 Hz от 14 до 32 kbit/s. G.729.1 также известен как G.729 Annex J и G.729EV где EV означает Embedded Variable (встроенное значение битрейта). Алгоритм G.729.1 основан на трехуровневой структуре кодирования: встроенное кодирование на основе линейного предсказания (CELP) используется в полосе низких частот (50–4000 Hz), параметрическое кодирование на высоких частотах (4000–7000 Hz) Time-Domain Bandwidth Extension (TDBWE), и расширение полного диапазона (50–7000 Hz) техникой кодирования предиктивной трансформации Time-Domain Aliasing Cancellation (TDAC). Time-Domain Aliasing Cancellation (TDAC).
, G.729.1 is an 8-32 kbit/s embedded speech … G.729.1 is an 8-32 kbit/s embedded speech and audio codec providing bitstream interoperability with G.729, G.729 Annex A and G.729 Annex B. Its official name is G.729-based embedded variable bit rate codec: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729. It was introduced in 2006. This codec has been designed to provide better quality and more flexibility than the existing ITU-T G.729 speech coding standard.G.729.1 is scalable in bit rate, acoustic bandwidth and complexity.In addition it offers various encoder and decoder modes, including the support of both 8 and 16 kHz input/output sampling frequency, compatibility with G.729B, and reduced algorithmic delay.The bitstream of G.729.1 is structured into 12 hierarchical layers.The first layer (or core layer) at 8 kbit/s follows the G.729 format.The second layer (adds 4 kbit/s for a total of 12 kbit/s) is a narrowband enhancement layer. The third layer (2 kbit/s for a total of 14 kbit/s) is a bandwidth extension layer. Further layers (in 2 kbit/s steps) are wideband enhancement layers.The G.729.1 output bandwidth is 50–4000 Hz at 8 and12 kbit/s, and 50–7000 Hz from 14 to 32 kbit/s. G.729.1 is also known as G.729 Annex J and G.729EV where EV stands for Embedded Variable (bit rate). The G.729.1 algorithm is based on a three-stage coding structure: embedded code-excited linear prediction (CELP) coding of the lower band (50–4000 Hz), parametric coding of the higher band (4000–7000 Hz) by Time-Domain Bandwidth Extension (TDBWE), and enhancement of the full band (50–7000 Hz) by a predictive transform coding technique referred to as time-domain aliasing cancellation (TDAC) or modified discrete cosine transform (MDCT) coding. As of January 1, 2017, the patent terms of most licensed patents under the G.729 Consortium have expired, the remaining unexpired patents are usable on a royalty-free basis.atents are usable on a royalty-free basis.
, Le G.729.1 est une norme de compression au … Le G.729.1 est une norme de compression audio de l'UIT-T. Ce codec est appelé large-bande car il permet de transporter la voix sur une bande passante plus grande que celle du téléphone analogique classique.
* Échantillonnage : 50 à 7000 Hz
* Bande passante sur le réseau : de 8 à 32 kbit/s passante sur le réseau : de 8 à 32 kbit/s
, G.729.1은 G.729, G.729 Annex A, G.729 Annex … G.729.1은 G.729, G.729 Annex A, G.729 Annex B와의 상호 운영성을 지닌 음성 및 오디오 코덱이다. 공식적인 명칭은 'G.729 기반의 가변 비트레이트가 내장된 코덱'(G.729-based embedded variable bit rate codec: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729.)이다. 이 코덱은 ITU-T G.729 음성 부호화 표준보다 더 좋은 품질과 더 높은 유연성을 제공한다. G.729.1은 비트레이트, 어쿠스틱 대역폭과 복잡도를 조절할 수 있다. 또한 G.729의 8에서 16 kHz 인풋/아웃풋 샘플링 주파수를 포함한 다양한 인코더와 디코더 모드를 지원한다.인풋/아웃풋 샘플링 주파수를 포함한 다양한 인코더와 디코더 모드를 지원한다.
, G.729.1は ITU-T G.729 を拡張した広帯域の音声とオーディオ用のコー … G.729.1は ITU-T G.729 を拡張した広帯域の音声とオーディオ用のコーデックで、G.729、G.729.A、G.729.Bとの相互運用性があり、8 kbps～32 kbps の広範囲のビットレートをサポートする。主に VoIP 用に利用されている。 G.729.1の正式な名称は"G.729-based embedded variable bit-rate coder:An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729" （G.729 ベースのエンベデッド可変ビットレート符号化: G.729 とビット列互換な 8-32 kbit/sスケーラブル広帯域符号化）である。.729 とビット列互換な 8-32 kbit/sスケーラブル広帯域符号化）である。
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G.729.1 is an 8-32 kbit/s embedded speech … G.729.1 is an 8-32 kbit/s embedded speech and audio codec providing bitstream interoperability with G.729, G.729 Annex A and G.729 Annex B. Its official name is G.729-based embedded variable bit rate codec: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729. It was introduced in 2006. As of January 1, 2017, the patent terms of most licensed patents under the G.729 Consortium have expired, the remaining unexpired patents are usable on a royalty-free basis.atents are usable on a royalty-free basis.
, Le G.729.1 est une norme de compression au … Le G.729.1 est une norme de compression audio de l'UIT-T. Ce codec est appelé large-bande car il permet de transporter la voix sur une bande passante plus grande que celle du téléphone analogique classique.
* Échantillonnage : 50 à 7000 Hz
* Bande passante sur le réseau : de 8 à 32 kbit/s passante sur le réseau : de 8 à 32 kbit/s
, G.729.1 это 8-32 kbit/s речевой аудиокодек … G.729.1 это 8-32 kbit/s речевой аудиокодек с совместимостью битового потока с G.729, G.729 Annex A и G.729 Annex B. Его официальное название G.729-based embedded variable bit rate codec: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729. coder bitstream interoperable with G.729.
, G.729.1은 G.729, G.729 Annex A, G.729 Annex … G.729.1은 G.729, G.729 Annex A, G.729 Annex B와의 상호 운영성을 지닌 음성 및 오디오 코덱이다. 공식적인 명칭은 'G.729 기반의 가변 비트레이트가 내장된 코덱'(G.729-based embedded variable bit rate codec: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729.)이다. 이 코덱은 ITU-T G.729 음성 부호화 표준보다 더 좋은 품질과 더 높은 유연성을 제공한다. G.729.1은 비트레이트, 어쿠스틱 대역폭과 복잡도를 조절할 수 있다. 또한 G.729의 8에서 16 kHz 인풋/아웃풋 샘플링 주파수를 포함한 다양한 인코더와 디코더 모드를 지원한다.인풋/아웃풋 샘플링 주파수를 포함한 다양한 인코더와 디코더 모드를 지원한다.
, G.729.1は ITU-T G.729 を拡張した広帯域の音声とオーディオ用のコー … G.729.1は ITU-T G.729 を拡張した広帯域の音声とオーディオ用のコーデックで、G.729、G.729.A、G.729.Bとの相互運用性があり、8 kbps～32 kbps の広範囲のビットレートをサポートする。主に VoIP 用に利用されている。 G.729.1の正式な名称は"G.729-based embedded variable bit-rate coder:An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729" （G.729 ベースのエンベデッド可変ビットレート符号化: G.729 とビット列互換な 8-32 kbit/sスケーラブル広帯域符号化）である。.729 とビット列互換な 8-32 kbit/sスケーラブル広帯域符号化）である。
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