With the development of notation, various kinds of scores had been come into being.

It is recorded that the earliest notation in China was a notation written for drums, as mentioned in a book Liji Touhu which was finished in Han Dynasty.

Taking the documents as the object, this paper has sorted out the notation system and the living situations of ancient Greek music that come from its contents and research methods, and attempts to.

There had been the method of recording music score in Han Wei Six Dynasties called "Shenquzhe"("the Snaking of Sound") which uses the earth worm-like curve line and assisted with Chinese characters.

The energy resolution of digital spectroscopy can be improved by finite impulse response (FIR) filters optimized for the presence of any kind of stationary noise.