The main asset of mobile-based VR is that people have already their mobile phone; they simply need to add an affordable phone accessory, a VR headset, for next-generation entertainment in the virtual environment: giant screen movie theater, concert, tour, games, ...

Mobile-based VR for the time being: Samsung Galaxy Note 4 + Samsung Gear VR
audio-video file > VR player running on a 2560*1440-screened Galaxy Note 4 phone slotted into a Gear VR headset > headphone out >> headphones

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Apparently, the killer app for mobile-based VR entertainment could be the player of movies (i.e. traditional 2D / 3D movies or new VR movies).

In order to have a great movie experience, the mobile VR device (i.e. mobile phone + VR headset) should provide the cleanest and most immersive audio possible:

. Clean audio via USB out port:
movie file > VR movie player running on a mobile phone slotted into a VR headset > PCM audio stream > VR headset's USB out >> standard USB DAC/amp >> standard headphones

. Immersive audio via virtual surround sound engine (Smyth Research's SVS, ...):
5.1/7.1 audio-encoded movie file > VR movie player with virtual surround sound engine running on a mobile phone slotted into a VR headset > PCM audio stream > USB audio out >> USB DAC/amp >> headphones

In order to have an immersive viewing enjoyment, the mobile VR device should provide most natural images possible at the highest possible resolution:

. Highest possible resolution in the next future: 4K or 3840*2160 (i.e. 1920*2160 per eye)
movie file > VR movie player with virtual surround sound engine running on a mobile phone with 4K display slotted into a VR headset > USB audio out >> USB DAC/amp >> headphones

. Most natural images possible using High Dynamic Range (HDR) technology (Dolby Vision, ...):
upcoming HDR-encoded movie file > VR movie player with HDR & virtual surround sound capabilities running on a mobile phone with 4K display slotted into a VR headset > USB audio out >> USB DAC/amp >> headphones


USB audio out, virtual surround sound, 4K display and HDR are obviously useful for other potential VR killer apps like games or videos (VR concert, VR tour, ...).

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