Radio remote control automatic playing system of piano
A technology for automatic playing and piano, which is applied to automatic musical instruments and instruments, etc. It can solve the problems of affecting the best relative position of the light barrier and the photoelectric sensor, inaccurate recording, and inability to record, so as to achieve strong self-adaptive ability of recording and simple maintenance Convenience, low distortion effect
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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings: figure 1 , figure 2 As shown, in the main piano, a permanent magnet is glued to the bottom surface of each key, and there is a circuit board under the key, and Hall sensors are installed on the circuit board directly opposite to the permanent magnet. Depending on the relative distance, the permanent magnet will generate different magnetic fields at the Hall element. The Hall element will output a voltage signal corresponding to the intensity of the magnetic field. The analog signal undergoes analog-to-digital conversion and the digital signal is input to the single-chip computer. The single-chip computer collects this voltage signal, and the relative distance between the permanent magnet and the Hall element at this time can be understood through certain analysis and calculation. Since the permanent magnet and the key are glued together, the movement state of the...
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