Microsoft details HoloLens: spatial sound, inertial measurement unit with accelerometer, gyroscope, magnetometer, and Holographic Processing Unit
BUILD 2015: A closer look at the Microsoft HoloLens hardware — This week, at the Microsoft Build Developer Conference …
Context & Ripple Effects
Microsoft's Windows Holographic reveal in January showed the interface; this week's Build session shows the machine behind it — an inertial measurement unit combining accelerometer, gyroscope, and magnetometer, spatial sound for positional audio, and a dedicated Holographic Processing Unit handling the sensing workload.
The follow-on coverage frames why that matters: the shipping headset's narrow field of vision versus the bulkier January demo unit is the cost of going untethered and self-contained, and the $3,000 Development Edition teardown a year later confirms the architecture held — with the TSMC-fabricated, 24-core HPU later detailed as the chip doing all environmental sensing on-device.
First-order effects
- Build developers get their first concrete hardware specification instead of a stage demo, letting them target the actual sensor stack — IMU plus spatial audio — rather than the holographic UI abstraction alone.
- Putting environmental sensing on a dedicated Holographic Processing Unit rather than the main CPU means the untethered headset can track its surroundings without draining compute needed for rendering.
Second-order effects
- The compactness-versus-field-of-view trade-off becomes the design battleground: any rival chasing an untethered AR headset inherits the same physics, so differentiation shifts to optics rather than raw compute.
- A developer-only pricing tier (the later $3K Development Edition) follows from this positioning — the device is sold as a toolchain, which concentrates early adoption among enterprises and studios willing to pay tooling prices.
Third-order effects
- Custom co-processors for perception are the durable pattern here: if head-mounted computing scales, the industry moves toward dedicated silicon for sensor fusion the way mobile moved toward dedicated image signal processors, with foundry partners like TSMC supplying the specialized parts.
- On-device sensing as an architectural commitment prefigures the broader split in ambient computing between cloud-dependent assistants and self-contained devices that process their environment locally.
The trend: Augmented reality hardware is consolidating around purpose-built perception silicon, with Microsoft's HoloLens establishing the template of offloading environmental sensing to a dedicated co-processor.