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AAC stands for Advanced Audio Coding and is a digital audio format designed for high-quality sound compression. It is commonly used for streaming and storing music because it achieves better sound quality than MP3 at similar bit rates. Developed in the late 1990s, AAC became popular with the rise of portable media players and online music services. Interestingly, it is the standard audio format for YouTube, iTunes, and PlayStation devices.
AAC uses a lossy compression algorithm that removes less audible sounds to reduce file size while preserving audio quality. It supports bit rates ranging from 8 kbps to 320 kbps, allowing flexibility depending on the user's needs for quality or space. The codec employs techniques like temporal noise shaping and prediction to optimize sound reproduction. As a successor to MP3, AAC includes improvements that enable more efficient coding of complex audio signals.
AAC files are widely supported across various platforms including smartphones, computers, and gaming consoles, making them versatile for everyday use. The format supports multi-channel audio, which allows for surround sound experiences in movies and games. It was created as part of the MPEG-2 and MPEG-4 specifications, reflecting its roots in the evolution of digital media standards. Many streaming services prefer AAC for its balance of quality and file size efficiency.
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