Why does my Ipad's ear buds have such a static sound?

I record videos on my Ipad using iphone ear buds plugged into the audio port, but when I listen to the video, there's this annoying almost static-sounding white noise that is distracting. Its constant. I don't know how to stop this, to get clearer audio. Any tips?

That sound is called "hiss",
and all electronic circuits produce some of it.

Better-quality equipment generates less hiss.

Setting level controls to optimum positions can help in some cases.
Considerable experimentation is often required
to find the best possible signal - to - noise ratio.

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