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MPEG-4 High Efficiency Advanced Audio Coding (kurz HE-AAC), auch AAC+ v1 genannt, ist ein lizenzpflichtiger Audio-Codec der Moving Picture Experts Group (MPEG). Der Standard liefert bei niedrigen Bitraten vergleichsweise gute Ergebnisse und eignet sich daher besonders für Live-Streams. HE-AAC (AAC+, aacPlus) – rozszerzenie formatu AAC, opracowane dla zachowania dobrej jakości dźwięku dla niskich przepływności strumieni binarnych. MPEG-4 aacPlus, znany również pod nazwą High Efficiency-AAC, to standard kompresji stratnej materiałów audio będący kombinacją trzech technologii kodowania: Advanced Audio Coding (AAC), Spectral Band Replication (SBR) oraz dodatkowo w HE-AAC v2 (AAC++). HE-AAC (High-Efficiency Advanced Audio Coding) は、オーディオの圧縮符号化の国際標準化方式であるMPEG-4 AACの拡張仕様であり、MPEG-4 Audio (ISO/IEC 14496-3)においてAACバージョン3として標準化された。HE-AAC が2003年に、HE-AAC v2 が2006年に制定された。MPEG-4 AAC Plus SBRや、Coding Technologiesの登録商標であるaacPlus、AAC+などの名称でも呼ばれている。 HE-AAC (англ. High-Efficiency Advanced Audio Coding — высокоэффективное усовершенствованное аудиокодирование) — формат сжатия звука с потерями, определен как профиль MPEG-4 Audio (Part 3) в стандарте ISO/IEC 14496-3. Формат является расширением профиля Low Complexity AAC (AAC LC), оптимизированным для приложений с низким потоком передачи данных цифрового потока. В профиле HE-AAC версия 1 (HE-AAC v1) используется технология восстановления высоких частот SBR (англ. Spectral band replication — копирование спектральной полосы) для повышения эффективности кодирования в частотной области. В профиле HE-AAC версия 2 (HE-AAC v2) технология SBR объединена с технологией Параметрического кодирования стереопанорамы (англ. Parametric Stereo) для повышения эффективности кодирования стереосигналов. Это ст Codificador avanzado de audio de alta eficiencia (HE-AAC del inglés —High-Efficiency Advanced Audio Coding—) es un formato de compresión de audio digital con pérdidas definido como un perfil MPEG-4 Parte 3 de audio en la ISO/IEC 14496-3 basado en la Replicación de banda espectral (Spectral Band Replication (SBR)) y el estéreo paramétrico (Parametric Stereo (PS)). Es una extensión de una de los tres perfiles definidos en el estándar MPEG-2 Parte 7 (AAC), el AAC LC (Low Complexity AAC), optimizado para tasas de bits bajas. High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. It is an extension of Low Complexity AAC (AAC-LC) optimized for low-bitrate applications such as streaming audio. The usage profile HE-AAC v1 uses spectral band replication (SBR) to enhance the modified discrete cosine transform (MDCT) compression efficiency in the frequency domain. The usage profile HE-AAC v2 couples SBR with Parametric Stereo (PS) to further enhance the compression efficiency of stereo signals. 고효율 고급 오디오 부호화(High-Efficiency Advanced Audio Coding, HE-AAC)는 디지털 오디오에서 쓰이는 손실 데이터 압축 방식이다. 복잡성이 낮은 고급 오디오 부호화(AAC LC)이며, 스트리밍 오디오와 같은 낮은 비트레이트 애플리케이션에 최적화되었다. 고효율 고급 오디오 부호화 버전1(HE-AAC v1)은 스펙트럼 대역 복제(Spectral band replication, SBR)를 사용하여 주파수 영역(frequency domain)에서 압축 효율을 향상시킨다. 고효율 고급 오디오 부호화 버전2(HE-AAC v2)는 스펙트럼 대역 복제와 파라메트릭 스테레오(PS)가 한 쌍을 이루어 스테레오 신호의 압축 효율을 향상시킨다.이 기법들을 사용하여 상당한 압축률의 향상을 이끌어 냈으나,박수와 같은 압축하기 어렵다고 알려진 음원에서는 음질의 열화가 발생한다고 알려져 있다. AAC+ of HE-AAC is een MPEG-4-audiocodec, en staat voor Advanced Audio Coding. AAC+ combineert drie technieken: AAC, (SBR, reproduceert hoge tonen), (PS, combineert 2 monostreams en maakt er een stereosignaal van terwijl er slechts 2-3kb/s extra informatie wordt gebruikt). De codec is vooral geschikt voor lage bitrates. Op bitrates van 32-64 kb/s heeft AAC+ veelal de beste geluidskwaliteit tegenover andere codecs. Bij hogere bitrates is AAC+ nog steeds beter dan MP3, een AAC+ van 80/96 kb/s klinkt ongeveer als een 128/140 kb/s MP3, maar met dezelfde grootte als de 96 kb/s MP3. Bij 128 kb/s en meer maakt het niet uit, het zal gelijk klinken aan MP3. AAC+ wordt vooral gebruikt voor internetradio en mediaspelers waar de opslagcapaciteit niet al te hoog is.Ook is het de codec die gebruikt wor Un codificador avançat d'àudio d'alta eficiència (HE-AAC de l'anglès High-Efficiency Advanced Audio Coding) és un format de compressió d'àudio digital que utilitza un algorisme de compressió amb pèrdua definit com un perfil MPEG-4 Part 3 d'àudio a l'ISO/IEC 14496-3 basat en la (Spectral Band Replication -SBR-) i l' (Parametric Stereo -PS-). És una extensió d'un dels tres perfils definits a l'estàndard MPEG-2 Part 7 (AAC), l' (Low Complexity AAC), optimitzat per taxes de bit baixes.
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HE-AAC (AAC+, aacPlus) – rozszerzenie formatu AAC, opracowane dla zachowania dobrej jakości dźwięku dla niskich przepływności strumieni binarnych. MPEG-4 aacPlus, znany również pod nazwą High Efficiency-AAC, to standard kompresji stratnej materiałów audio będący kombinacją trzech technologii kodowania: Advanced Audio Coding (AAC), Spectral Band Replication (SBR) oraz dodatkowo w HE-AAC v2 (AAC++). Zarówno technologia AAC, jak i aacPlus zostały opracowane przez szwedzką firmę Coding Technologies. SBR to unikatowa technika poszerzania pasma częstotliwości sygnału, która pozwala kodekom audio dostarczać taką samą jakość sygnału przy połowie mniejszym strumieniu binarnym danych. Technologia Parametric Stereo znacząco zwiększa wydajność kodeka w celu zmniejszenia strumienia binarnego stereofonicznych sygnałów audio. SBR i PS to zatem dwie metody pozwalające na zwiększenie wydajności kodeka audio. W rezultacie technologia kodowania aacPlus umożliwia dostarczanie wielokanałowych sygnałów audio (np. 5.1) już dla strumienia binarnego 128 kbps, a sygnałów stereofonicznych – nawet przy 32 kbps. Poziom wydajności technologii kodowania aacPlus fundamentalnie zwiększa zatem możliwości nowych zastosowań na rynku transmisji cyfrowych i mobilnych sygnałów audio. AAC+ of HE-AAC is een MPEG-4-audiocodec, en staat voor Advanced Audio Coding. AAC+ combineert drie technieken: AAC, (SBR, reproduceert hoge tonen), (PS, combineert 2 monostreams en maakt er een stereosignaal van terwijl er slechts 2-3kb/s extra informatie wordt gebruikt). De codec is vooral geschikt voor lage bitrates. Op bitrates van 32-64 kb/s heeft AAC+ veelal de beste geluidskwaliteit tegenover andere codecs. Bij hogere bitrates is AAC+ nog steeds beter dan MP3, een AAC+ van 80/96 kb/s klinkt ongeveer als een 128/140 kb/s MP3, maar met dezelfde grootte als de 96 kb/s MP3. Bij 128 kb/s en meer maakt het niet uit, het zal gelijk klinken aan MP3. AAC+ wordt vooral gebruikt voor internetradio en mediaspelers waar de opslagcapaciteit niet al te hoog is.Ook is het de codec die gebruikt wordt voor digitale etherradio in DAB+ vorm. High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. It is an extension of Low Complexity AAC (AAC-LC) optimized for low-bitrate applications such as streaming audio. The usage profile HE-AAC v1 uses spectral band replication (SBR) to enhance the modified discrete cosine transform (MDCT) compression efficiency in the frequency domain. The usage profile HE-AAC v2 couples SBR with Parametric Stereo (PS) to further enhance the compression efficiency of stereo signals. HE-AAC is used in digital radio standards like HD Radio, DAB+ and Digital Radio Mondiale. MPEG-4 High Efficiency Advanced Audio Coding (kurz HE-AAC), auch AAC+ v1 genannt, ist ein lizenzpflichtiger Audio-Codec der Moving Picture Experts Group (MPEG). Der Standard liefert bei niedrigen Bitraten vergleichsweise gute Ergebnisse und eignet sich daher besonders für Live-Streams. 고효율 고급 오디오 부호화(High-Efficiency Advanced Audio Coding, HE-AAC)는 디지털 오디오에서 쓰이는 손실 데이터 압축 방식이다. 복잡성이 낮은 고급 오디오 부호화(AAC LC)이며, 스트리밍 오디오와 같은 낮은 비트레이트 애플리케이션에 최적화되었다. 고효율 고급 오디오 부호화 버전1(HE-AAC v1)은 스펙트럼 대역 복제(Spectral band replication, SBR)를 사용하여 주파수 영역(frequency domain)에서 압축 효율을 향상시킨다. 고효율 고급 오디오 부호화 버전2(HE-AAC v2)는 스펙트럼 대역 복제와 파라메트릭 스테레오(PS)가 한 쌍을 이루어 스테레오 신호의 압축 효율을 향상시킨다.이 기법들을 사용하여 상당한 압축률의 향상을 이끌어 냈으나,박수와 같은 압축하기 어렵다고 알려진 음원에서는 음질의 열화가 발생한다고 알려져 있다. Codificador avanzado de audio de alta eficiencia (HE-AAC del inglés —High-Efficiency Advanced Audio Coding—) es un formato de compresión de audio digital con pérdidas definido como un perfil MPEG-4 Parte 3 de audio en la ISO/IEC 14496-3 basado en la Replicación de banda espectral (Spectral Band Replication (SBR)) y el estéreo paramétrico (Parametric Stereo (PS)). Es una extensión de una de los tres perfiles definidos en el estándar MPEG-2 Parte 7 (AAC), el AAC LC (Low Complexity AAC), optimizado para tasas de bits bajas. HE-AAC (High-Efficiency Advanced Audio Coding) は、オーディオの圧縮符号化の国際標準化方式であるMPEG-4 AACの拡張仕様であり、MPEG-4 Audio (ISO/IEC 14496-3)においてAACバージョン3として標準化された。HE-AAC が2003年に、HE-AAC v2 が2006年に制定された。MPEG-4 AAC Plus SBRや、Coding Technologiesの登録商標であるaacPlus、AAC+などの名称でも呼ばれている。 HE-AAC (англ. High-Efficiency Advanced Audio Coding — высокоэффективное усовершенствованное аудиокодирование) — формат сжатия звука с потерями, определен как профиль MPEG-4 Audio (Part 3) в стандарте ISO/IEC 14496-3. Формат является расширением профиля Low Complexity AAC (AAC LC), оптимизированным для приложений с низким потоком передачи данных цифрового потока. В профиле HE-AAC версия 1 (HE-AAC v1) используется технология восстановления высоких частот SBR (англ. Spectral band replication — копирование спектральной полосы) для повышения эффективности кодирования в частотной области. В профиле HE-AAC версия 2 (HE-AAC v2) технология SBR объединена с технологией Параметрического кодирования стереопанорамы (англ. Parametric Stereo) для повышения эффективности кодирования стереосигналов. Это стандартизованная и улучшенная версия аудиокодека AACplus. HE-AAC используется в стандартах цифрового радиовещания DAB+ и Digital Radio Mondiale. Un codificador avançat d'àudio d'alta eficiència (HE-AAC de l'anglès High-Efficiency Advanced Audio Coding) és un format de compressió d'àudio digital que utilitza un algorisme de compressió amb pèrdua definit com un perfil MPEG-4 Part 3 d'àudio a l'ISO/IEC 14496-3 basat en la (Spectral Band Replication -SBR-) i l' (Parametric Stereo -PS-). És una extensió d'un dels tres perfils definits a l'estàndard MPEG-2 Part 7 (AAC), l' (Low Complexity AAC), optimitzat per taxes de bit baixes.
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