Patent ID: 9488726
Filing Date: 2016-11-08
CPC Classification: G01S

Claim Text:
1. An object detection method using ultrasonic waves for use in managing power modes of an electronic appliance, comprising: emitting a plurality of ultrasonic signals sequentially according to a time interval; sensing a sound wave formed by the ultrasonic signal reflected by a reflection object to generate a reflected signal; and analyzing the reflected signal to detect the at least one reflection object, the analyzing step of each reflected signal comprising: sampling the reflected signal to generate a plurality of sample values, and form a real-time environment array having the sample values, wherein the sample values correspond to a plurality of indices, respectively; comparing, according to the indices, the sample values in the real-time environment array with a plurality of environment elements in a cumulative environment array corresponding to the indices to generate an object appearance array, wherein each of the environment elements is one of the sample values in previous real-time environment arrays corresponding to the same index obtained in a plurality of previous analyzing steps, the object appearance array has a plurality of first markers corresponding to the indices, respectively, each of the first markers corresponds to a comparison result of the sample value and the environment element corresponding to the same index, wherein the comparing operation comprises: selectively cumulating a plurality of cumulative values corresponding to the indices in a continuous appearance array based on the first markers in the object appearance array according to the indices, wherein each of the cumulative values is larger than or equal to 0, and the cumulating operation comprises: updating a plurality of second markers in a moving object array corresponding to the indices to respond to the change of the cumulative values in the continuous appearance array according to the indices, wherein the updating operation comprises: managing power modes of the electronic appliance based on the values in the object appearance array and the moving object array.