(Advanced Audio Coding)
aac 是一种音频文件格式, 其工作原理类似于 mp3, 但压缩的不仅仅是 mp3。它显著减少了音频文件大小, 而不会丢失质量。为了减小文件大小, 它使用 mpeg-4 标准来切断人类耳朵里听不到的低频声音。
AAC is an audio file format that works similar to MP3 but compresses more than MP3. It significantly reduces the audio file size without losing the quality. To reduce the file size it uses the MPEG-4 standard to cut off the low frequency sounds that cannot be heard in a human’s ear.