What is the form of HE-AAC?
Introduction to AAAA
HE-AAC (often referred to as AAP) is a lossy compression system for digital audio and is short for High Performance Advanced Audio Encoding. It is optimized for use with audio streaming where a low re-rate is required such as Internet radio, streaming music services, etc. There are currently two versions of this compression scheme known as HE-AAC and HE-AAC V2. The second analysis uses more refined features and is more standardized than the first version (HE-AAC).
Support for HE-AAC format
In digital music, there are several examples of how the HE-AAC format is supported and used. These include:
Software Media Player How many different Jacobix software applications support the HE-AAC format varies greatly. For example, iTunes (version 9 and higher) and Winamp (Pro version) support both HE-AAC encoding and decoding. However, many other programs such as Foobar2000, VLC media player, etc., only support the playback of HE-AAC encoded audio files.
Streaming Music Services Online music services like Pandora Radio and Rhapsody use the HE-AAC compression system to efficiently stream high-quality audio to its users. Using HE-AAC, the bandwidth requirement for streaming is much lower than with other codec systems – in most cases acceptable audio can be distributed as low as 32 kbps.
Internet Radio Because HE-AAC is so efficient at low-bitrates, this compression scheme is ideal for radio stations to webcast their broadcasts in real time.
First version of HE-AAC
Developers of Coding Technologies first created a compression system by integrating Spectra Bandwidth (SBR) into AAC-LC (Low Complexity AAC) – the trade name the company uses is CT-aacPlus. SBR (also known as coding technologies) is used to enhance audio by effectively coding high frequencies. This coding enhancement technology, which is particularly good for running voice transmission, works by creating high frequencies at a low rate – it is stored at 1.5 Kbps.
In 2003, AAA V1 was approved by the MPEG organization and included in their MPEG-4 document as an audio standard (ISO/IEC 14496-3:2001/Amd 1:2003).
Another version of HE-AAC
CodeAEA V2, which was developed by Coding Technologies, is an improved version of the already released e-AAA and was officially designated by the company as Enhanced AAC+. . This second revision is called parametric stereo.
As well as AAA-LC and SBR to efficiently encode audio in the first revision of AAAAC, this second version also has an additional device called parametric stereo. It focuses on effectively compressing stereo signals. Instead of working across the frequency spectrum, in the case of SBR, a parametric stereo device works by using information about the differences between the left and right channels. This side information can then be used to define the spatial arrangement of the stereo image in the audio file based on this EAAA V2. When decoders use this additional spatial information, it can be reliably (and efficiently) reproduced during playback while maintaining the bitrate of the streaming audio to minimize stereo distortion.
HE-AAC V2 also includes other audio enhancements in its toolbox, such as mono, error masking, and stereo reduction for playback. Approved and standardized by the MPEG Organization in 2006 (as ISO/IEC 14496-3:2005/Aimd 2:2006), it is commonly known as HE-AAC V2, AACPlus V2, and EAAC+. goes.