插值采样增强钢琴音高识别能力的方法

针对钢琴音符频率跨度广,对音符的识别要求高的情况,本文提出了一种利用内插进行升采样的方法。充分利用了插零算法的计算量小,效果显著的优点,提高了原有的采样率,并设计相应低通滤波器进行滤波处理,结合三电平中心削波的自相关法对钢琴音符频率进行检测识别。计算机仿真的检测结果基本达到预期目标,相比内插前较大地提高了钢琴的音高识别能力,满足了识别要求。

The scope of the piano note frequency is very large, and there is strict requirement with pitch identification. This paper proposes a method based on interpolation for up-sampling, fully using its less calculation and marked effect. It raises sampling rate as well as a specific design for low pass filter in this paper, and detects the pitch with three-level center clipping autocorrelation function. By means of computer simulation, this method achieves the anticipated purpose basically. It is proved by experimental results that the proposed approach is applicable to enhance the capability of the piano pitch identification, comparing with that before interpolation, which satisfy the requirement stated above effectively.