One of the key features of Apple’s HomePod speaker is the beamforming technology used to adjust the sound output to the shape of the room, and using those same microphones for a neat Siri trick. By cancelling out the music output, Siri commands can be easily heard by the speaker even when it is blasting out music at full volume.
A new Apple patent application, published today, suggests that Apple may be seeking to use the same basis of that beamforming tech in its rumored over-ear headphones, to achieve two things …
First, says the patent, it could make the headphones reversible. Instead of having to ensure that we’re putting them on the right way round, the left earcup over the left ear, the headphones could automatically detect the orientation and adjust their output to match.
In one embodiment, a system for automatic right-left ear detection for a headphone comprises a first earcup and a second earcup that are identical. Each of the first and second earcups includes five microphones which are also used for purposes other than ear detection: a first microphone, a second microphone, a third microphone that is located inside each earcup facing the user’s ear cavity, a fourth microphone located on a perimeter of each earcup in a triangle shape with the first and second microphones (top left, top right, and bottom middle), and a fifth microphone located above and to the left of the second microphone on a perimeter of each earcup when looking at an outside housing of each earcup. In one embodiment, when the first earcup is worn on a user’s right ear the first microphone is at a location farther from a user’s mouth and the second microphone is at a location closer to the user’s mouth.
In other words, as soon as you speak, the headphones can tell which microphone is nearest to your mouth on each earcup, and from this can work out which way around the headphones are being worn. A Siri command to play music, for example, would result in stereo channels playing through the correct earcups.
Second, the input from an array of microphones could be used to separate speech from background noise – wind or traffic, for example – and filter out the latter on phone calls.
A processor […] may be used to perform voice beamforming towards the user’s mouth to capture the user’s speech and perform noise beamforming away from the user’s mouth to capture environmental noise.
HomePod’s audio quality has made me a lot more optimistic about the headphones than I would otherwise have been. We’ve seen concept images and speculation about the possible name. As always with Apple patents, there’s no way to tell whether the idea will ever be incorporated into a product, but this one seems a likely bet.
Via Patently Apple