Key Takeaways
- MPEG is a video and audio encoding technique with a wide range of features, while AAC is an audio format that is part of the MPEG-4 standard.
- MPEG supports up to 48 channels, arbitrary bit rates, and variable frame length, while AAC offers a range of sampling rates up to 96 kHz and supports up to 48 channels.
- AAC is considered a higher quality audio format than MP3, which is another common audio format based on the MPEG standard.
Differences between MPEG and AAC
MPEG
MPEG stands for Moving Picture Experts Group. It is a video and audio encoding technique with a wide range of features. MPEG is utilized in various appliances and devices. It uses a hybrid coding algorithm that combines modified discrete cosine transform (MDCT) and fast Fourier transform (FFT).
MPEG supports up to 48 channels, arbitrary bit rates, and variable frame length.
AAC
AAC stands for Advanced Audio Coding. It was designed as the successor to MP3 for low-bit-rate perceptual audio compression, particularly for efficient internet multimedia. AAC employs a modified discrete cosine transform (MDCT) algorithm, resulting in higher compression efficiency compared to MP3. AAC offers a range of sampling rates up to 96 kHz and supports up to 48 channels, including mono, stereo, and multichannel surround sound. AAC also supports scalable representations in terms of sample amplitudes (or S/N ratio) and sampling rates.
To summarize, AAC offers a range of sampling rates up to 96 kHz and supports up to 48 channels, while MPEG supports up to 48 channels, arbitrary bit rates, and variable frame length.
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