How to reduce microphone noise

How to reduce microphone noise

 

Background or ‘ambient’ microphone noise can be a real pain, but there are tricks to help reduce it. To some extent any sound recording will generate background noise, but there’s a lot that you can do to minimise interference. Follow the steps below for tips on how to minimise background noise from an audio recording.

WHAT YOU’LL NEED

Microphone

Computer

The Knowhow

Mic noise appears when sound is transferred from one device to another. Here’s how to reduce it:

On laptop recordings:

Windows Vista, XP, and Windows 7:

Go to Start

Select Control Panel

Open Hardware and Sound

Choose Sound

Choose Recording

Find the Microphone bar

Right-click on the Microphone bar, and then select Properties

Find the Levels tab, and look for the Microphone Boost tool

Move the dial all the way down on the Microphone boost

Move the dial all the way up on the Microphone

Next, go to the tab marked Enhancements

If they aren’t already ticked, tick the following boxes: Noise suppression and Acoustic echo cancellation

Press OK

To test the noise, go back to the Recording menu

Go to Listen to this device

Click OK

OS X (MacBook and MacBook Pro’s using OS X versions 10.4.6 and later):

Go to System Preferences

Find Sound preferences

Look for the Ambient Noise Reduction tool

Check the box marked Use ambient noise reduction

Move the dial up and down (until you find the right balance of audio output v. background noise)

On microphones

Check for nearby devices which might cause interference

Switch off anything noisy (i.e. ceiling fans, televisions, laptop fans, or traffic noise)

Speak directly into the microphone

Close doors and windows

Make sure that the mains electrical cables are not running across signal cables (i.e. if you’re using a wireless mic). The same goes for mains cables and audio cables (i.e. headphone leads), because the electromagnetic force which surrounds mains cabling can cause interference.

Use the right sort of mic. A general-purpose mic won’t pick up quiet acoustic instruments or subtle sounds. You need a microphone designed to pick up difficult-to-record sounds (ask for a back-electret mic)

Use a separate microphone – not just the one in your computer

Use a digital recording device separate from your PC

On headsets and headphones

Check the headphone jack – make sure it is securely plugged into the device, and that it has been plugged into the mic jack (and not the audio input jack)

Try a different power socket – all electrical circuits produce noise

Listening through a laptop computer? Unplug the power cable and use the computer’s battery power.

Make sure the ear buds are properly inserted into your ears – windy conditions can affect the audio output

Noise reduction accessories

Software:

There are several good free online software downloads for editing video and audio recordings.

Audacity is a free online tool which is designed to isolate and remove unwanted background noise. Other good alternatives include WavePad, and Wavosaur, but you can search for ‘free noise reduction software’ on Google and experiment with different software downloads.

When you start searching, make sure that you choose a download for sound editing software and not a noise reduction tool for photography .

Mac has a feature called GarageBand which is an sound editing package designed for musicians – it comes with most OS X packages but is also available as an App on iTunes.

Preamplifiers

Use a Mic Preamplifier. This eases the transition between your Mic and other equipment (prepares it for transfer).

Power adaptors

Invest in a ground lift adaptor for your laptop power supply – these do an excellent job of reducing static noise, particularly if you use multiple sections of recording equipment.

Shock mounts

Fit a shock mount to the mic stand to reduce background noise cause by tremors and vibrations.

Wind socks

Use a wind sock – this fits over the mic’s head and cuts out unwanted wind interference.

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