ABSTRACT
The digital sampling rate required to obtain an undistorted signal at half that frequency and all lower frequencies. To obtain accurate wave form reproduction out to 20 kHz (the upper hearing limit for those with excellent hearing), the Nyquist theorem determines that it is necessary to have a sampling rate of 40 kHz. In practice, a guard band is necessary between the upper program frequency and the Nyquist frequency, and so a sampling rate of 44.1 kHz is utilized for the compact disc. Modern digital recording systems often have sampling rates substantially higher than this. Although this allows for more flexibility with digital recording procedures, it is not really necessary for adequate sound reproduction in final-product, digital playback systems.
