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Spectrogram of an exponential chirp. The exponential rate of change of frequency is shown as a function of time, in this case from nearly 0 up to 8 kH
Spectrogram of an exponential chirp. The exponential rate of change of frequency is shown as a function of time, in this case from nearly 0 up to 8 kHz repeating every second. Also visible in this spectrogram is a frequency fallback to 6 kHz after peaking, likely an artifact of the specific method employed to generate the waveform.
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Modern frequency counter
Modern frequency counter
Image: Resonant reed frequency meter
Image: Resonant reed frequency meter
Image: Czestosciomierz 49.9Hz
Image: Czestosciomierz 49.9Hz