Sound signal trace design by using grey and fuzzy theory

Sound waves are the most direct ways to broadcast messages in nature, but due to high-tech skills, the tracing of sound signals can come true only when lots of expenditures human resources, and fine are used. Consequently, this paper offers the advantages of the combination of the grey theory and the fuzzy controller to realize the design of realizing the tracing of sound signals. In order to get a sound source tracing system fast and with high accuracy, we proposed three steps in this paper. The first is to use the piezo-electric element to make a set of four-direction sound-drawing sensor. It´s used to make samples from analog signal information we obtain, and these samples are transformed into digital signals for the computer to analyze, compute and handle. The second is to use the advantages of the gray color theory to make analyses and decisions of the characteristic values about grey relational grade. The last is to use the fuzzy controller to make output control of the target object and the returning back of the location sensor.