Time-Frequency Analysis
Est. read time: 1 minute | Last updated: April 13, 2025 by John Gentile
Contents
Fourier-Based Analysis Methods
Short-Time Fourier Transforms (STFTs)
Polyphase Filter Bank (PFB) Channelizers
For higher quality spectral analysis than STFT methods, one should use a filterbank approach instead of a windowed FFT. Put simply, the STFT approaches use a single multiplication per sample at the input of the FFT- a channelizer uses a polyphase filter for each input. With PFB filtering, much better spectral separation is achieved between the FFT bins compared to just windowing.
For more info, see the Multirate DSP page on PFB Channelizers.
References
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