In order to realize a noise octave analysis by software, a digit weight method based on FFT is proposed.
为了利用软件实现噪声倍频程分析，提出了一种基于FFT的数字计权方法。
2
Using the method, digit weight and digit system error modification for virtual noise octave analyzer can be realized.
利用这一方法，可以实现虚拟噪声分析仪的数字计权和数字式系统误差修正。
3
This paper analyse the image enhancement, the binarization, the noise abatement, the thinning, the normalization and the feature extraction on the handwritten digit recognition.