How to Reduce Audio Noise with VSDC Free Video Editor

Sometimes footage may sound “noisy” simply because there were too many background sounds when you were recording it. Don’t rush to hit the “Delete” button, though. In most cases, you can easily fix it.

In this instruction, we’ll show you how to reduce audio noise from your recording using VSDC Free Video Editor. If you don’t have the tool yet, you can download it from the official page.

VSDC Free Video Editor provides two powerful Audio Denoise filters: Median filter and Audio gate.

Audio gate is one of the most commonly used techniques in audio production post-processing. This filter comes in especially handy when you work with live recordings trying to remove the unwanted sounds between passages, because it is so efficient at recognizing steady noise sources – such as rumble, hiss, and hum – and reducing them to the minimum.

Technically, when you apply Audio gating, you control when and to what degree audio passes through a channel. In other words, you create a gate to filter the sounds in the video.

Audio Gate feature

You may want to apply gating for three reasons:

  1. To reduce the unwanted external sounds
  2. To reduce some natural channel noise
  3. To use Audio gate as a special effect

Here is how it works. Gates are controlled by setting several parameters:

  • Threshold. Decibel level in which the gate opens or closes. The higher the threshold, the louder the sound (stronger the signal) must be to open the gate.

    Threshold settings

  • Attack. Controls the speed of the gate opening and consider very fast attack time for percussive instruments. Slower times (10 ms or more) for everything else.

    Attack settings

  • Release. The release time is key to a natural sounding audio decay. For noise elimination with an electric guitar, set the parameter much higher.

    Release settings

  • Reduction. Sets the amount of signal reduction.

    Reduction settings

  • Ratio. It determines how much compression is applied. For example, if the ratio is set to 4:1, every 4dB of signal that crosses the threshold will be compressed down to 1dB.

    Ratio settings

  • Knee. Determines how the compressor responds once the signal crosses the threshold. A hard knee clamps down right away, while a soft knee causes the compressor to gradually kick in as the signal gets further past the threshold.

    Knee settings

  • Make-up gain. A control that raises the level of the signal, once it has been processed, to the desired level for the next stage of the signal.

    Make-up gain settings

Now that we’ve walked through the process of applying Audio gate, let’s take a look at how Median filter works.

Median filter helps you eliminate impulse noise in your footage. In a nutshell, this can be ideal for removing unwanted, frequent sharp sounds like clicks and pops.

Median Denoise filter

  • FFT block size. FFT (Fast Fourier Transform) is an important measurement method which converts a signal into individual spectral components and thereby provides frequency information about the signal.

    FFT block size parameter

  • Window type. There are several different types of windows used to reduce spectral leakage when performing a Fourier Transform on time data and converting it into the frequency domain.

    Window type parameter

  • Overlap mode. The setting determines what percentage of the FFT size block of data points is re-used for the next trace. Overlap processing can be used to provide high resolution in both the frequency and time axis.

    Overlap mode parameter

  • Overlap coefficient. High overlap percentages and low FFT block sizes provide the highest time resolution but take longer to process the data file.

    Overlap coefficient parameter

Hopefully, this was helpful. Even though it may sound (or look) overwhelming, once you start – you’ll see how fast and easy audio noise reduction really is. Now go and try it yourself!

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