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VoiceAge - USAC (Unified speech and audio coding)
http://www.voiceage.com/USAC.html
USAC (Unified speech and audio coding) is an MPEG codec speech and audio codec defined in ISO/IEC 23003-3. It is also known as the Extended High-Efficiency AAC (xHE-AAC) audio codec which is the latest member of the MPEG AAC codec family. VoiceAge - USAC (Unified speech and audio coding) USAC (Unified speech and audio coding)
Unified Speech and Audio Coding | MPEG
https://mpeg.chiariglione.org/standards/mpeg-d/unified-speech-and-audio-coding
Unified Speech and Audio Coding (USAC) is the newest MPEG audio standard, published in late 2011. It achieves consistently state-of-the-art compression performance for any mix of speech and music content.
EP2373014A4 - Unified speech/audio codec (usac) …
https://patents.google.com/patent/EP2373014A4/en
Unified speech/audio codec (usac) processing windows sequence based mode switching EP16195085.2A Pending EP3151241A1 (en) 2008-11-26: 2009-11-26: Unified speech/audio codec (usac) processing windows sequence based mode switching Family Applications After (1) Application Number Title Priority Date Filing Date ...
USAC Separates Speech from Audio for Improved Compression ...
https://mpeg.chiariglione.org/news/usac-separates-speech-audio-improved-compression
Unified Speech and Audio Coding (USAC) became an international standard in 2012 within MPEG-D and provides a significant improvement over MPEG-4 High-Efficiency AAC version 2 (HE-AAC v2) at low bit rates. The decoding model in USAC consists of three paths between the de-multiplex of the transport signal and the decoded frames of content.
ecodis :: Audio Codecs
http://www.ecodis.de/audio.htm
MPEG-D Unified Speech and Audio Coding (USAC) and MPEG-H Audio 2010–2016 During and after my work on Fraunhofer's HE-AAC encoder, I joined the development of two other codec standards: MPEG-D Extended HE-AAC, published under the name unified speech and audio coding (USAC) in ISO/IEC 23003-3, and MPEG-H Audio, specified in a second edition in ISO/IEC 23008-3.
Encoder Technology – StreamS
https://www.indexcom.com/products/encoder/encodertechnology/
xHE-AACAudio Codec Technology USAC preserves the same overall structure of HE-AACv2. The core coder consists of an AAC based transform coder, enhanced by ACELP speech coding technology AMR-WB+. An enhanced Spectral Band Replication (SBR) tool, eSBR, handles high frequencies, while MPEG surround 2-1-2 supplies parametric stereo coding.
xHE-AAC - VoiceAge - codec solutions
http://www.voiceage.com/xHE-AAC.html
Where previous audio codecs had specific strengths in coding either speech or audio content, USAC is able to encode all content equally well regardless of the content type. The codec supports single and multi-channel coding at high bit rates and …
[USAC] Unified Speech and Audio Coding Ref Code
https://hydrogenaud.io/index.php?topic=103017.0
There is no publicly available high quality USAC encoder despite it was published as standard 3 years ago. In fact there are already a few audio standards which have no available good implmentations (sinusoidal coding, MPEG Surround and now USAC). Opus has the same quality as USAC at 64 kbps and higher bitrates. Oh, and it's available
xHE-AAC
https://www.iis.fraunhofer.de/en/ff/amm/broadcast-streaming/xheaac.html
The audio codec of choice for adaptive audio and video streaming and digital radio At a glance Latest generation of the AAC codec family Single codec for all content types including: Audio for Video Services Music Audiobooks Podcasts Improved quality at stereo bit rates of 12 to 500 kbit/s or above Allows adaptive streaming through MPEG-DASH or HLS
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