Remember of Nyquist theorem sample rate = 8000 / 2 = 4000, now do you know your FFT can get frequencies between 3.9063 Hz at 4000 Hz.įFT Bin of corresponding frequencies: 1 -> 3,90625 hzįor it you need just the first half values of FFT, for this case 1024. Spectrum analyzers enable tests like noise figure and signal-to-noise ratio (SNR) to characterize the performance of a device and its contribution to overall system performance. If you choose 2048 points and sample rate 8000, do you will have a frequency resolution = 3.9063 (8000 /2048).Īpply one window function over your 2048 points, then apply FFT and get magnitude ! A spectrum analyzer measures the magnitude of an input signal versus its frequency over the full frequency range of the instrument to determine the power of signals. First decide the frequency resolution that you want, for example you can set the sample rate from your mic at 8000hz, now choose one chunk size like 1024 or 2048 to capture from your mic. Anytune (Mac) is available separately from the Mac App Store.
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