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Microphone noise filters

Know different filters and tools that helps in removing background  noise in microphones.

Know everything regarding background noise in microphone and the solutions by using various tools and factors.

 Ways to Get Rid of Microphone Background Noise

As a singer or artist, playing the guitar, drums, or singing over the mic, every engineer dealing with the mic, should ask himself as it crucially important for good sound is:" by overcoming every problem how to get the most audible sound ?". 

Not every microphone is as good, not even every room used for recording is likewise. It is not possible to remove every single noise from the surrounding, but there are still several methods to minimize it. 

You can use mictest.me to test your mic for clearer and audible sound

Before you put your feet into further things, lets first give a glimpse about mic audio noise :

Background Noise Types

Mic noise can be described as an “undesired sound”. The continuance and level of the background sound determine the characteristics of noise. There are 3 main noise types.

  • Broadband Noise (or continuous noise) is the noise in which the acoustic power is spread over an extensive range of frequencies as it is picked up by a microphone. The sounds like hiss and immobile noise belong in this class.

  • Narrow Band Noise is restrained to a narrow range of frequencies. This sort of noise has a uniform audio level usually caused by inaccurate grounding and poorly shielded cables attached to microphones. Narrow Band Noise is any undesired signal that remains constant over time.

  • Impulse Noise holds sharp sounds such as clicks and pops in a mic. It has a high frequency and short duration.

1 . Microphone Sensitivity And Gain Setup:

When it comes to choosing the right mic for your need microphone's sensitivity plays an essential role to get an output accordingly.

One should know that some microphones are more sensitive than others and the audio quality is not associated with their sensitivity. Once opened to the same sound source, different microphone models might generate various audio output levels.

 An area between the microphone’s noise level, clipping point, distortion, and sens determines whether or not a microphone may be suitable for a specific use. A microphone with high sensibility might require less preamp gain. Also, it may have more limited headroom before clipping than a mic with lower sensation. It’s also worth keeping in mind that your result will depend a lot on microphone quality. 

2 . Microphone Windshield to Reduce Outdoor Noise:

Foam or fur (Windjammer); is the mixture of these two products looks great for obstructing the noises generated by the wind. It must be placed over the microphone’s head. 

These dead cat designed accessories will prevent wind interference as well as complex breathing and burst noises. These shields offer up to 12dB of wind noise denial. All the windscreens would somewhat reduce the total level of the microphone volume and selectively depress the level of greater frequencies. 

Though they accomplish this with less audio interference from the ambient air and reduce environmental noise, any microphone you use with the windshield will produce more accurate sound. 

3 . Pop Filter for Microphone Noise Reduction: 

If you want to avoid plosive and sibilance from your recording you should examine using pop filters for your microphones. It is generally not for outdoor use and you can see it is usually used in studio/home studio. It is a filter that is placed between a singer/speaker and the microphone. 

A pop filter with a round disc looking object should be mounted on a mic stand and has a flexible boom to place it exactly where needed. It also helps to keep moisture away from the mic, which is good for your equipment. Some microphones, such as the SM58, have a built-in pop filter under the metal casing, which reduces this problem a little bit.

4 . Adaptive Noise Reduction Technology: 

The noise-canceling method uses an indicating audio input signal which includes just noise. This signal is transferred into an adaptive filter and following decreased from the original input. This Noise Attenuation effect can immediately overcome background noise such as fans, air conditioners, background conversations, rain, wind, etc. Practically any high-level Noise Reduction software involves an adaptive noise canceling option. 

Each audio recording holds a certain quantity of noise. To produce the best audio recordings, these unwanted sounds must be removed as much as possible with ambient noise reduction. Till just a few years ago, ambient noise reduction was a difficult and costly process. The new age of high-speed computers provided with quality sound cards and microphone noise-canceling software has made audio noise extraction very easy. There is also the chance of using a real-time noise-reducing microphone. 

These noise removal filters are getting better as technology progresses. If you use these tips, you will keep the mic environment noise aside from your live achievements or studio recordings. Nevertheless, you will significantly decrease the quantity of noise in your output signal with microphone noise reducing software.

You can buy tools from microphone filters

5 . Noise Gate:

A noise gate is mainly used for the reduction of undesired external sounds and to help reduce background noise. It permits an audio sign to pass within just when it is over an origin value. In short, it is usually used when the level of the audio signal is beyond the level of the noise. If systematically set, the noise gate will lessen steady noise static from the amplifier. With very few changes, and by the use of the gate, you can get free from the undesired background noise that your microphone chooses up, both at the stage or in your home studio.

Noise gate usually has FIVE parameters:

  • Threshold sets the level at which the gate opens to allow the sound to go through.

  • The ratio is the equilibrium between the initial sound and the gated sound.

  • Attack estimates the period it takes for the gate to move from a closed to an open state.

  • Hold grants the gate to be held in an open state after the signal level has dropped under the threshold.

  • The release is mainly used to estimate how long it needs for the gate to go from fully open to fully closed.