This article is about how to Remove background noise from audio and video. If you’ve ever recorded video or audio, you’re probably familiar with the problems of background noise. Whether you’re shooting a family movie or recording a street interview with a microphone, the resulting footage may contain unwanted sounds: breathing, uneven voices, traffic noise and other ambient noises, or various hums and buzzes caused by a malfunctioning microphone. If you find that your video or audio has unwanted background noise, there’s no need to trash your work.
When recording to incorporate sound effects or other video design elements, background noise often needs to be removed. Some techniques can be used to remove this background noise. By adding background music to your video, you can reduce noise or use software for audio or video editing. Below, we have mentioned ways to remove background noise from audio and video.
How to Remove background noise from audio and video
Decrease the subject-to-microphone distance and increase the microphone-to-noise distance
The single most effective way to improve speech-to-noise ratio is to reduce the object-to-microphone distance. Think of a live performance where a singer holds the microphone directly to his/her mouth. That incredibly short subject-to-microphone distance can handle loud stage volumes. For this same reason, lavalier microphones are often used to capture productive conversation in high-noise environments. Lavaliers can often be placed near the mouth and equipped with boom microphones, improving the speech-to-noise ratio.
Eliminate sources of background noise
If possible, it is best to remove acoustic noise sources before recording. For example, if there is an air conditioning unit nearby, it is much easier to turn it off than to try to eliminate the sound in post-production. Similarly, if the traffic noise is audible, moving to a new place is the best solution. Most of the time this is easier said than done.
Reducing wind noise is also very important. Wind noise can wreak havoc on microphone preamplifiers and create artifacts that cannot be removed. Be sure to use effective windscreens on microphones, especially when outdoors. A quick listen with headphones reveals sound sources, such as wind noise, that aren’t obvious.
Use directional microphones
Microphones with cardioid, supercardioid, and shotgun pole shapes are less sensitive to off-axis audio signals or signals that are not within the microphone’s optimal selection.up area. This feature can be used to reduce background noise. When noise sources cannot be eliminated, position the microphones so that the sound sources sit within the null or low-sensitivity region of the microphone’s polar pattern. The exact null angle depends on the pole shape. When a cardioid microphone null is 180 degrees off-axis, the null angle changes as the microphones gain more direction. The null of a supercardioid microphone is between 127 and 233 degrees.
Use a low-cut filter on the microphone or in the first stage of amplification
Most background noise is ‘pink-noise-like’, with most energy at low frequencies and less energy at high frequencies. Because voice energy is very low below 100 Hz, it is good practice to use a high-pass (also referred to as low-cut) filter when recording conversation. For applications where speech intelligibility is more important than maintaining a natural, full-sounding speech signal, more aggressive high-pass up Can be used up to 320 Hz.
Remember that “telephone quality audio,” which is optimized for 90% speech energy, has a frequency response of approximately 300 to 3,000 Hz. Many microphones have their own high-pass filters. First apply the filter on the microphone. If more high-pass is needed, implement it in the preamplifier. When high-pass filters are used in both the microphone and the preamplifier, the slope of the filter increases, resulting in a rapid drop-off of low frequencies.
Minimize the number of open microphones
Currently recording microphones are sometimes referred to as “open”. When the number of open microphones is doubled, the overall background level increases by 3 dB in the mix. For example, when recording a group discussion with eight participants, there is a 9 dB speech-to-noise penalty when all microphones are open compared to when only one microphone is open. Managing a scene with multiple speakers can be difficult to do manually, especially for things that aren’t scripted. Audio devices MixAssist and Dugan Automatic Mix automatically open and close microphones so sound professionals can focus on the overall mix.
Use real-time noise suppression
While there are many options for computerized noise reduction, there are few portable options for performing real-time noise suppression live in the field. CEDAR’s discrete noise suppression units are popular choices for sound professionals who require real-time noise suppression. Now, for the first time in the history of production audio, adaptive, real-time noise suppression is now available directly on the mixer-recorder with Audio Devices NoiseAssist. NoiseAssist is a real-time, single-ended noise reduction algorithm that uses an advanced algorithm to separate speech from background noise. NoiseAssist is easy to use, with just one set of background noise reduction levels. Up Up to 20 dB of suppression is available, although 3-6 dB attenuation is suitable for most situations.
Real-time noise suppression tools like NoiseAssist are useful in many applications – for example, fast productions that don’t have time for post, live broadcast and streaming, in-set previews, feeds to Video Village, IFB feeds, rough guide compounds and so on. When using any type of noise suppression, record the raw channel to provide for post-production work. Post-production has a whole arsenal of tools for processing audio, and it’s important to keep a “raw” track free of any noise. The ability to record a processed and unprocessed track is powerful feature 8-Series mixer-recorders and set up are very easy up.
We hope you will understand and enjoy this article how to Remove background noise from audio and video. You can remove background noise from video with video editing software like VideoStudio. Follow along with us tutorial Learn the easiest way to remove background noise from video below. Even if you’re working with decent mics and a good quality setup, you can’t control every aspect of video production.
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