深刻理解DFT和基2-FFT的算法原理、编程思想，掌握C程序设计的基本技术。-A deep understanding of DFT and the 2-FFT-based algorithm, programming ideas, grasp the basic C programming techniques.

Goertzel DFT implementation in C#. This is Goertzel s style of calculating Discrete Fourier Transform, is a windowed transform similar to STFT. This implementation will need some small modification for your use, but I post because it is rare in