It depends on 1) the IR attenuation of the filter and 2) the sensitivity of the camera element to IR.
IR filters can only attenuate incoming IR so much while still allowing nearby red wavelengths through. And any filter will have a non-flat response through the visible wavelengths, slightly distorting the color response of your photos.
A properly coded IR signal from the transmitting 'disabler' device could still be picked up by the iPhone even if it was severely attenuated. At ~30fps, you can quickly get 100+ samples to cross-correlate with to search for the encoded 'disable' signal.
My gut feeling is that Apple patented this technology because it was low-hanging fruit. They saw they could roll it into a legitimate patent and prevent others from claiming it down the road. Still, I think it's worthwhile to send a quick letter to the powers that be to let them know we all disprove. If it does get implemented, the popularity of jailbreaking will move up another notch.
IR filters can only attenuate incoming IR so much while still allowing nearby red wavelengths through. And any filter will have a non-flat response through the visible wavelengths, slightly distorting the color response of your photos.
A properly coded IR signal from the transmitting 'disabler' device could still be picked up by the iPhone even if it was severely attenuated. At ~30fps, you can quickly get 100+ samples to cross-correlate with to search for the encoded 'disable' signal.
My gut feeling is that Apple patented this technology because it was low-hanging fruit. They saw they could roll it into a legitimate patent and prevent others from claiming it down the road. Still, I think it's worthwhile to send a quick letter to the powers that be to let them know we all disprove. If it does get implemented, the popularity of jailbreaking will move up another notch.