To solve the problems in novel tangible acoustic interfaces approaches [time delay of arrival (TDOA) and location pattern match (LPM)], a new method (which is amplify contrast method) of setting threshold so as to determine the arrival point will be applied, and three new thoughts on LPM, which are improved LPM, time match, and amplitude attenuation match, would be proposed. Traditional TDOA is based on measuring time difference and wave velocity. Traditional LPM is based on time reversal theory and cross correlation. New thoughts are based on amplification on signal, classification of signal source, match time, and uniqueness of damping. Amplify contrast method improves the accuracy of determining the arrival point.