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Doesn't the USB-C standard already have a well-defined way of connecting an analog headphone, using only a passive adapter? Download the standard and scroll to
by cesarb 10y ago
Doesn't the USB-C standard already have a well-defined way of connecting an analog headphone, using only a passive adapter? Download the standard and scroll to the end, it's an appendix. IIRC, it can even be used while charging, with the correct passive adapter.
The question then only becomes, is the phone's DAC connected to the USB-C connector, or did the manufacturer omit it to save a few traces in the board? Did anyone test that Moto-Z with a passive USB-C to 3.5mm socket adapter, to see what happens?
- unwind 10y agoAssuming you mean the sideband pins, the article says that Intel is working on a standard to let those pins be used for analog audio. If there's no standard way to communicate that "yeah, the sideband pins are now analog audio out from the host", I don't think you can buld USB-compliant accessories that assume that. This would mean that the adapter (and/or low-cost headphones, I guess) would still need to include a CPU that can speak USB to negotiate with the host about the sideband pins, would be my assumption. A bit like how max current (used to) work.
- gman99 10y ago> the article says that Intel is working on a standard to let those pins be used for analog audio In that case, the article is wrong because the USB 3.1 spec already supports analog audio via the Audio Adapter Accessory Mode. Whether this phone supports this mode is unclear, but it's part of the existing spec explicitly to allow passive USB-C to 3.5mm adapters Official spec: http://www.usb.org/developers/docs/ http://www.usb.org/developers/docs/ page 166 of the USB-C spec: http://www.those.ch/designtechnik/wp-content/uploads/2014/08/USB-Type-C-Specification-Release-1.0.pdf http://www.those.ch/designtechnik/wp-content/uploads/2014/08...