The preliminary report on the margin of error during the extremal sampling

Abstract

The maximum and minimum information of the acoustic waveform plays a key role in the reproduction of sound, maintaining the pitch, loudness and timbre. We have estimated the margin of error of the extrema, which would facilitate not only the visualization but also the operation of the acoustic structue. The sampled extrema were manipulated by the three steps of ±20%, ±40% and ±60% of amplitude errors and more three steps of ±4%, ±9% and ±14% of phase errors. The subjective scores have determined that the margin of error of the extrema exceeded ±20% for amplitude and ±4% for phase. The results have supported the idea that the great many resources of the wav-formattedfile could be converted the temporal series of the approximated extrema under the spectral constraint from 80 to 5,120Hz.