How to eliminate speaker noise?

- Jun 19, 2020-

01 white noise

White noise is a kind of random noise in full frequency domain. It sounds like a continuous "hissing" sound, similar to the sound when there is no signal on TV to play snowflakes.

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White noise is usually generated by the gain device or power amplifier in the device. If the volume is adjusted too high, it is easy to generate obvious bottom noise. At this time, it is necessary to check the output volume of sound card, software and speaker to ensure that no overload occurs in each link.

PS: a high sensitive microphone, such as a condenser microphone, can pick up the almost inaudible noise in the room environment, such as air conditioning, outdoor noise, wind noise, etc. Don't neglect the influence of environmental noise when recording.

02 digital distortion

Digital distortion often produces a harsh "buzzing" sound, which really doesn't sound like the sound of nature. Generally speaking, it will vary according to the process used by the computer. For example, when using different software or effectors, the digital distortion will also change.

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Digital distortion is usually caused by some problems with the sound card, or by connecting the monitor speaker to the same socket as the computer. Make sure that the power supply of your monitor speaker or other playback equipment (such as monitor controller) is connected to the independent power socket of the computer and other digital equipment. Or use a reliable power adapter.

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03 back call

Feedback is usually due to the microphone is too close to the speaker, the microphone will pick up the sound of the speaker and self excitation occurs. At this time, there will be harsh high-frequency whistling. When watching some small bands perform tuning, it will often appear.

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When recording, put on headphones to monitor instead of the monitor speaker, so that the microphone will not pick up the speaker sound and self excite. When there is no condition to use headphones for performance or performance, you can stay away from the speaker and reduce the microphone gain.

04 crackling noise

These sounds can generally be divided into the following two types:

One is the random distribution of crackle, the most likely reason is the software parameters. You should be able to increase the buffer size.

Second, there is a rhythmic crackle, such as a half second crackle, which may be caused by damage to the sound card or improper installation of the driver.

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This kind of crackling noise is often caused by incompatible sound card software or drivers. For example, the buffer size is set too low, Bluetooth or wireless devices are connected to the system, or the software compatibility is poor. You can check the software compatibility of the sound card on the official website to see if your computer does not meet the minimum requirements required by the sound card

If you have this kind of noise coming out of your speaker, you can try unplugging the speaker and connecting it to the earphone to listen to it, and determine where the noise comes from.