This week, we look at the notch filter.
The waveform view of our sample audio
The spectral view of our sample audio.
Note the pink line running horizontally across the display between 5kHz and 6kHz
The spectral view of our sample audio, zoomed on the vertical scale
Here we can see that the offending tone is actually around 5700Hz
Spectral view after a 25dB cut
Notice how the line of the offending tone is approximately the same colour (and therefore the same amplitude) as the surrounding audio
Spectral view after a 15dB cut
Spectral view after a 45dB cut
Here, we can see that we’ve scooped out too much, which has left a hole in the audio we wanted to keep around the 5700Hz region
