TOTAL LEAST-SQUARE TECHNIQUE FOR ESTIMATING THE VIBRATION PARAMETERS OF THE APPLE FROM THE TIME-DOMAIN IMPULSE-RESPONSE SIGNAL

This paper introduces the Hankel matrix based total least square (HTLS ) technique to process the time domain acoustic impulse response signa l for vibration parameters of the apple. It has a major advantage of b eing able to separate the modes in a coupled resonant peak which occur s for some apples. The HTLS technique can be used together with a mode identification technique, which is outside the scope of this paper, t o determine the spherical resonant frequency. This may improve the rel iability of non-destructive firmness determination of fruit based on a coustic response measurements. (C) 1995 Silsoe Research Institute