考虑音频信号的数据库，在这里你需要找出一首歌，因为它是打模式匹配的应用程序。数据通常存储在一个低采样速率占用更少的内存。-Consider a　of audio signals and a pattern matching application where you need to identify a song as it is playing. Data is commonly stored at a low sampling rate to occupy less memory.