From what you've described, it sounds like it may be a network-related issue. Check out the "If you have connection or sound quality issues with FaceTime" section of this article: If you can't make a FaceTime call on your iPhone, iPad, or iPod touch. If you're using FaceTime over Wi-Fi, check out the information here about interference: Resolve
Apple iPhone 12. 75. 81. Black Shark 5 Pro. Compared to its predecessor, the iPhone 12’s recording dynamics show an improved signal-to-noise ratio. Background sounds are quieter, and the sound envelope is well preserved. In loud environments, our perceptual tests showed good attack for both instruments and voices.
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When you plug an external microphone into your iPhone, FiLMiC Pro should automatically select it and disable the iPhone’s internal microphones. Audio setting page in FiLMiC Pro. To double-check, you can go into your audio settings. The Microphone Selector should show that the “Headset Microphone” is selected.
2. Use a microfiber cloth. Microfiber is a soft piece of cloth that doesn’t scratch your iPhone. To clean your iPhone microphone with a microfiber cloth: fold the fleece to create a tiny edge. Next, roll it over each mic spot repeatedly to remove dirt. 3. Clean mic using isopropyl alcohol, toothbrush, and earbud.
2) You do not have a reference lab quality microphone with flat frequency response to compensate for 1. 3) The fact that the microphone is enclosed in your cell phone case will change the frequency response due to the effect of the microphone inlet geometry, see articles on Helmholtz resonance and audio design. . 32 461 147 335 351 82 266 222

iphone 11 pro microphone location