实时滤波器，具有精美界面，可以开发自己的应用功能。-You can use 4 types of filters:

- Butterworth

- Chebyshev 1

- Chebyshev 2

- Elliptic

You can use them as:

- Lowpass

- Highpass

- Bandpass

- Stopband

Showing theirs features in frequency, phase and the z plane. After the desing phase you can apply the designed filter in real time to incoming audio signal from the microphone.