擷取自：http://en.wikipedia.org/wiki/Sampling_rate
The full range of human hearing is between 20 Hz and 20 kHz.[3] The minimum sampling rate that satisfies the sampling theorem for this full bandwidth is 40 kHz. The 44.1 kHz sampling rate used for Compact Disc was chosen for this and other technical reasons.
這兩個K只是單位吧，不是都一樣嗎?
