Patent ID: 8130595

Claim:
A control device for an electronic appliance, comprising: a sound detector which detects a series of sound waves generated at predetermined time intervals for control of the electronic appliance to perform sound-electricity conversion; an edge signal extractor which generates edge signals in response to generation timings of the individual sound waves in the series of sound waves based on a voice signal output from the sound detector; an edge pulse generator which generates edge pulses based on the edge signals; and a judgment processing circuit which generates a first gate having a first time width to detect whether or not a second sound wave of the series of sound waves has been generated after elapse of a first predetermined time from a first time when a first edge pulse is generated, when the sound detector detects a first sound wave of the series of sound waves in an ungenerated state of the series of sound waves and the edge pulse generator generates the first edge pulse corresponding to the first sound wave, and which generates a second gate having a second time width smaller than the first time width to detect whether or not a third sound wave of the series of sound waves has been generated after elapse of a second predetermined time from a second time when a second edge pulse is generated, when the edge pulse generator generates the second edge pulse corresponding to the second sound wave within the first gate.