 The ADPCM model instead stores samples by recording the "error" relative to a prediction function which means more of the original signal survives the encoding process; as such ADPCM compression instead trades accuracy of the representation for size by using relatively small sample sizes, usually 4bits.The human auditory system's tolerance for the noise this causes makes the loss of accuracy barely noticeable.Like other encoding formats, ADX supports multiple sampling frequencies such as 22050 Hz, 44100 Hz, 48000 Hz, etc.