well, i heard this:
wifi off: low pitch, low volume "rumbling" - direct memory access (image data being processed & stored into RAM), every ~5second two high pitch higher volume "squeaks" - writing to SD card
wifi on: same as before, this time the rumbling sounds more like scratching. Tiny "clicks" in background is wifi. broadcasting SSID.
moving: well, by moving i meant more rapid moving to "hear" if something is loose inside camera, but i doubt that.
From what i heard i can tell, that xiaomi didn't do proper job for filtering (capacitors) power lines to the ambarella chip (or whatever manages audio). Its caused by "cheap circuitry" in power source that isn't stable enough and the fact that there aren't enough capacitors properly placed near the processing chip. You can commonly hear these sounds in cheap soundcards mostly in laptops or older computers. But then this camera was never intended as a hifi audio source, its audio is just an addition to the picture. If you want hifi audio solution, you need to grab something different.
If you meant these rumbling / squeaking sounds as them "clicks", then i am affraid no shielding will most probably help you since they are caused internally... Note, that these sounds intensify with WiFi on, which means increased power consumption = bigger load on the power souce = bigger unstability = more pronounced noise.
Oh and this noise also induces into the image sensor as well, luckily there is huge ammount of software post-processing involved for picture, not so much for sound
wifi off: low pitch, low volume "rumbling" - direct memory access (image data being processed & stored into RAM), every ~5second two high pitch higher volume "squeaks" - writing to SD card
wifi on: same as before, this time the rumbling sounds more like scratching. Tiny "clicks" in background is wifi. broadcasting SSID.
moving: well, by moving i meant more rapid moving to "hear" if something is loose inside camera, but i doubt that.
From what i heard i can tell, that xiaomi didn't do proper job for filtering (capacitors) power lines to the ambarella chip (or whatever manages audio). Its caused by "cheap circuitry" in power source that isn't stable enough and the fact that there aren't enough capacitors properly placed near the processing chip. You can commonly hear these sounds in cheap soundcards mostly in laptops or older computers. But then this camera was never intended as a hifi audio source, its audio is just an addition to the picture. If you want hifi audio solution, you need to grab something different.
If you meant these rumbling / squeaking sounds as them "clicks", then i am affraid no shielding will most probably help you since they are caused internally... Note, that these sounds intensify with WiFi on, which means increased power consumption = bigger load on the power souce = bigger unstability = more pronounced noise.
Oh and this noise also induces into the image sensor as well, luckily there is huge ammount of software post-processing involved for picture, not so much for sound
