- Basic digital filter design To build a digital filter out of a RC element
- Bessel filter Bessel low pass filter
- Butterworth filter Butterworth low pass and high pass filter
- Chebychev filter Chebychev low pass and high pass filter
- Shelving filter Digital equlizer filter with variable transfer ratio in the blocking area
- Butterworth band pass and band stop filter Butterworth low pass to band pass and band stop transformation
- Discrete Fourier Transformation With a small speed improvement
- Fast Fourier Transformation Recursive and not recursive with a small speed improvement
- First order Goertzel algorithm As a form of the Fourier transformation
- Second order Goertzel algorithm As a form of the Fourier transformation
- Reinsch algorithm One more form of the Fourier transformation
- Discrete Hartley Transformation A transformation without complex numbers
- Fourier transformations of some signal shapes Fourier transformations of a rectangle, triangle, sawtooth, Fsk, Ask, Psk, Pwm and a cut sinus signal
- Fourier Transformation in the mountains A small animation of another use of the Fourier transformation