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AAC compression, audio compression, digital audio compression, audio codec, audio compression algorithm, audio compression software, audio compression format, lossy audio compression.

How Does AAC Compression Work?

Audio Compression

As someone who works with digital audio on a daily basis, I’m always interested in learning more about audio compression. AAC compression is one of the most popular audio compression methods, used by many music streaming services and online music stores.
According to the book “The Art of Digital Audio Recording,” AAC compression works by “removing audio data that is deemed to be less important to the overall sound.” This is different from lossless compression methods, like FLAC, which preserve all of the original audio data.

Audio Codec

AAC stands for Advanced Audio Coding, and it’s a type of audio codec that is used to compress digital audio files. According to the website of the Fraunhofer Institute for Integrated Circuits, “AAC is the most efficient audio codec available today.”
One of the benefits of using AAC compression is that it can significantly reduce the size of audio files without sacrificing too much quality. This makes it a popular choice for music streaming services, which need to deliver high-quality audio to their users while minimizing bandwidth usage.

Lossy Audio Compression

AAC compression is a type of lossy audio compression, which means that some of the original audio data is discarded during the compression process. This is different from lossless compression methods, like FLAC, which preserve all of the original audio data.
In my experience, using AAC compression has allowed me to store more music on my devices without sacrificing too much quality. While there is some loss of audio data, the overall sound quality is still very good, and the reduced file size is definitely worth it.
Final Words:
Overall, AAC compression is a great option for anyone who wants to compress their digital audio files without sacrificing too much quality. And if you’re looking for a way to normalize and convert your audio files, I highly recommend checking out mp4gain.
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How AAC works

AAC Music File Format

Like MP3, AAC is a lossy music storage format. As in the case of the MP3 format, AAC encoding algorithms cut the highest and lowest frequencies, and also actively use the characteristics of a person’s hearing to remove information about sounds that a person cannot easily distinguish when listening to music. . As a result of compression, AAC files do not sound identical to CD-quality files, but in general the algorithms compress the music efficiently enough that most people overlook the fact that it has been deleted. resulting sound information.

AAC Audio Format

Like MP3, the quality of an AAC file is measured by its bit rate. Common AAC bit rates include 128 kbps, 192 kbps, and 256 kbps.

Without going into technical details, here are the reasons why AAC files sound better than MP3s:

AAC encoding uses samples with a wider frequency coverage from 8 to 96 kHz; mp3 encoding uses samples with coverage from 16 to 48 kHz
Up to 48 channels can be encoded, while MP3 encodes 2 channels in MPEG-1 mode and up to 5.1 channels in MPEG-2 mode
Arbitrary bit rates and variable frame lengths are used

Higher algorithm efficiency and simpler filter banks (instead of hybrid MP3 encoding, AAC uses pure MDCT method)
Greater precision is provided when encoding AAC sound using smaller sample sizes, which are equal to 128 or 120 units, while 192 units are used for mp3 encoding. In this case, the smaller sample size allows you to code more precisely, since the original sound wave is an analog signal, and for a more accurate description, it needs to be measured as often as possible. Therefore, a smaller sample size is better because it allows you to more accurately describe the analog nature of a sound wave in digital form.

Sound frequencies above 16 kHz are processed more efficiently. Let me remind you that in mp3 format these frequencies are simply erased
More progressive algorithms are used in stereo binding mode. Let me remind you that stereo stitching allows you not to store both channels separately, as in CD-quality recording. The common signal for both channels is stored and only the difference between the channels is stored separately from each other.
Additional modules were added to improve compression efficiency: TNS, Inverse Prediction, PNS and others
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How AAC works with iTunes

Apple adopted AAC as its primary audio format. All songs stored in iTunes Store and all songs streamed or downloaded from Apple Music are encoded in AAC format. All AAC files in the Apple ecosystem are encoded at 256 kbps.