This audio cleanup technique converts a time-domain signal into a frequency-domain spectrogram to isolate constant background noise. The software establishes a noise floor threshold for individual frequency bins. When the signal in a specific bin drops below its designated threshold, the algorithm attenuates or mutes that frequency, leaving the desired audio intact.
We need to apply spectral gating to this interview tape to pull the HVAC hum out of the background.
Related terms
Gating
The process of controlling or blocking a signal based on a specific threshold or timing condition.
Squelch
A circuit function that mutes the audio output of a receiver when no strong signal is present.
Black noise
A spectral profile characterized by absolute silence interrupted by occasional random spikes.