| Summary: | 碩士 === 逢甲大學 === 電機工程所 === 99 === This thesis proposes the phenomenon of piezoelectric speaker driver using fuzzy logic combined with Taguchi method to regulate the gain of output voltage. Nowadays, the enjoyment of life is gradually becoming more and more important. The magnificence of music has also become one of the most important things in our life. On the market, cabinets’volume, which has excellent response, is rather large and needs more space to place. Compared with moving-coil speaker and piezoelectric speaker, the first one is vibrated by the membrane to generate sound by current, and the other one is vibrated by voltage. The audio signal will be weaken by decreasing frequency after going through the speaker. It is the most important thing to keep the loudness identically of the hearing after the audio signal goes through the speaker. This framework proposes piezoelectric speaker driver using fuzzy logic combined with Taguchi method. The frequency and voltage signal captured by the output of the speaker driver are sampled. And those signals are sent to fuzzy controller to regulate the value of digital potentiometer. The output voltage gain of piezoelectric speaker driver can be determined by digital potentiometer value. Finally, this regulated voltage is sent to piezoelectric speaker to improve low frequency response.
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