关键词: 音高识别, 基音检测, 快速傅里叶变换, 端点检测

Abstract:

An improved pitch recognition algorithm based on the relevant processing and Fast Fourier Transform（FFT） is proposed.The music signal is preprocessed by the use of the three-level center clipping function.Then the pitch is estimated by using the related processing method.A filter is designed by using the parameters which are aroused from the estimated pitch value.After filtering the music signal the precise frequency result can be got by using FFT method.The algorithm has higher recognition accuracy than the traditional time domain processing method，and more effectively recognizes the pitch which is rich of harmonic than the traditional harmonic peaks method，and has less amount of computing than the wavelet algorithm.The experimental simulation proves that the method is feasible，fast and reliable.

Key words: recognition of pitch, fundamental tone detection, Fast Fourier Transform（FFT）, endpoint detection