A built-in block that determines the frequency of a signal is not available in the Simulink product.
To work around this issue, you can write a C-MEX S-function that implements a fast Fourier transform (FFT) algorithm. For more information, see "Writing S-Functions" in the Simulink documentation.
Otherwise, use one of the following built-in options provided by the Signal Processing or DSP toolbox products:
- Use the Spectrum Scope block to compute the frequency of a signal.
- Use the FFT and Buffer blocks to create a signal frame and analyze its frequency.
