Through theoretical analysis, it is confirmed that the linear frequency modulation Z transform is effective in refining the single frequency signal. A more accurate frequency value can be obtained by finding the position of the extreme point. The pitch detection requirements of the piano and the nature of the linear frequency modulation Z transform are analyzed and used in the pitch detection to make the detection accuracy, reliability, anti-interference, real-time and stability meet the

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... ments of the factory. The labor intensity of workers is greatly reduced, the production efficiency of the factory is improved, and the quality of the products is more stable and reliable.