This analytical method visualizes how the spectral content of a signal changes over time. Instead of looking at a pure time-domain waveform or a pure frequency-domain spectrum, engineers use tools like spectrograms or wavelet transforms to plot a three-dimensional surface or two-dimensional heat map. It is essential for analyzing non-stationary signals like human speech, radar pulses, or frequency-hopping transmissions where the frequency shifts dynamically.
The time-frequency representation clearly shows the chirp signal sweeping from 2 kHz to 5 kHz over the ten-millisecond burst.
Also heard as
- TFR
Related terms
Time-frequency analysis
A signal processing method that evaluates spectral properties alongside their temporal occurrence.
Wavelet modulation
A digital modulation technique that uses orthogonal wavelets as carrier signals.
Spectrum
The entire range of electromagnetic frequencies available for transmitting wireless communication signals.