Tune the center frequency of an Octave Filter block in Simulink® using the optional input port.
1. Run the simulation. The From Multimedia File block sends a stereo audio stream to the Octave Filter block. The center frequency of the Octave Filter block can be tuned using the manual switches routed into the optional input port. The filtered audio is sent to your computer's default audio device. The filtered audio and unfiltered audio are sent to a Spectrum Analyzer block for visualization.
2. Tune the center frequency by toggling manual switches routing constant values. The constant value routed from the left is multiplied with the constant value routed from the right. The center frequency of the Octave Filter block can be set at 400, 800, 4000, and 8000 Hz.
3. Observe the Spectrum Analyzer as you tune the center frequency. Note how the center frequency changes as you toggle the manual switches.