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Apple VP of Acoustics interview
It’s packed with lots of interesting detail. Some highlights:
Eric Treski jumps in here to explain how “full circle” this process is, encompassing not only the Acoustics Team, but also the Apple Music Team and the team behind GarageBand and Logic, who have access to music producers and artists and from whom they take feedback.
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“These differences can be mathematically categorised by something that’s called head related transfer function. You’ll see this referred to as HRTF frequently. In developing this feature we captured thousands of HRTFs on different people. And these are quite complex, difficult measurements to do – we’re measuring the sound, the response or your ear to a speaker in multiple different directions – and we really did that so that we could come up with the best HRTF that works for everyone, which is again very easy to say and not easy to do. It’s not just creating an average, it’s creating the HRTF that’s kind of closest to everybody’s perceptual response”.
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Something I hadn’t realised is that Spatial Audio is tuned differently depending on the source device: “when watching a movie on Apple TV the virtual speakers are placed further away from you than when you’re watching on an iPhone”, Geaves says. Apparently, it would just sound weird to combine a fairly small screen that’s quite close to you with virtual speakers that seem a long way away.
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“Obviously the wireless technology is critical for the content delivery that you talk about”, he says, “but also things like the amount of latency you get when you move your head, and if that’s too long, between you moving your head and the sound changing or remaining static, it will make you feel quite ill, so we have to concentrate very hard on squeezing the most that we can out of the Bluetooth technology, and there’s a number of tricks we can play to maximise or get around some of the limits of Bluetooth. But it’s fair to say that we would like more bandwidth and… I’ll stop right there. We would like more bandwidth”, he smiles.