This study utilized the principle of piezoelectric effect of piezoelectric ceramics and consisted of two parts of experiments. The first part is to use the positive piezoelectric effect of piezoelectric ceramics, install piezoelectric ceramic sheets in the resonance box of the guitar, and pluck the strings to record the electrical signals emitted by the piezoelectric ceramics when the vibration of the resonance box is recorded. The frequency of the electrical signal and other data, in order to sum up the frequency characteristics of the electrical signal when the guitar emits different tones, and compare and verify the audio frequency with the existing frequency data. The second part is to use the inverse piezoelectric effect of piezoelectric ceramics plates, and use laser Doppler vibrometer to analyze the regular vibration of the resonance box surface when inputting current to the piezoelectric ceramic. This study verifies the feasibility of piezoelectric ceramics to identify the tones of musical instruments, and establishes the basis for the development of more comprehensive piezoelectric ceramics. In today's human life, the popularity of musical instruments is becoming wider and wider, and the demand for musical instruments is getting higher and higher. The emerging professions and sciences and technology derived from this are also increasing. In order to meet the needs of people to recognize the tone and tone of the instrument, the tuning fork tool has appeared in history, and with the improvement of the level of science and technology, various electronic tone tones identification technology is also developing. The electronic guitar tuner sold in the market, the song recording and recognition program in the smartphone software, the basic principle of Pzt 5a material stripe piezo ceramic is to accurately recognize the pitch of the recorded or played music, thereby determining the match with the music tones in the library.
Piezoelectric effect and piezoelectric ceramics
The piezoelectric effect is a phenomenon in which mechanical energy and electrical energy are converted into each other under certain conditions. When some materials of piezoelectric plates piezoelectric sensors are subjected to mechanical force to cause stretching or compression, polarization occurs inside them, causing equal amounts of electric charges to appear on opposite surfaces of the material. The larger the external force, the more surface charge, the effect is generally Called the positive piezoelectric effect, the sign of the surface charge depends on the direction of the external force. When an electric field is applied to these materials, mechanical deformation occurs, and if it is an alternating electric field, elongation or compression occurs alternately, that is, mechanical vibration occurs. This phenomenon is called the inverse piezoelectric effect. Piezoelectric ceramics are artificially fabricated polycrystalline piezoelectric materials with piezoelectric effects.
Application of piezoelectric ceramics in the field of sound in the field of music and sound, rectangular piezoelectric sensor play a huge role. Sound converters are one of the most common applications. Piezoelectric ceramics can be used as sound transducers for pickups, microphones, earphones, buzzers, ultrasonic detectors, sonar, and ultrasonic flaw detectors. For example, a buzzer on a children's toy is a current that vibrates through the inverse piezoelectric effect of the piezoelectric ceramic, and emits a sound that can be heard by the human ear. Piezoelectric ceramics can generate vibrations of different frequencies through the control of electronic circuits, thereby emitting various sounds. For example, an electronic music greeting card converts an AC audio signal into a sound signal through an inverse piezoelectric effect.