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Stereo Linear / 2 Channel Recording

Are there any Android devices that support multi-channel (stereo) recording via line-in?

With the tested devices (Nexus 4, HTC Buzz, Motorola Xoom ..) you can install AudioFormat.CHANNEL_IN_STEREO, but I get only one active channel.

Is this a serious limitation of Android due to licensing issues, or does it depend on the manufacturer / equipment, that is, is there only one analog-to-digital converter for input, or some of them?

Any feelings, thoughts or ideas on this topic?

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Are there any Android devices that support multi-channel (stereo) recording via line-in?

Regarding most factory smartphones and tablets, there is an unpleasant answer with Android: None.

Why not? Since these devices (and BTW are also all iPhone) use the 4pin TRRS-3.5mm-plug to connect headphones and / or a microphone to the device. Four pins are used for T) the left speaker, R1) the right speaker, R2) the ground for the speaker and microphone, and finally S) the monaural microphone.

UPDATE: When I added in December 2013 that “TRRRS invention (I would suggest calling it“ T3RS ”), the plug will solve the problem“ I couldn’t know that Sony was already working on it and introduced the “STM-10” stereo microphone specifically with this T3RS plug in February 2014.

T3RS plug

This is a gerneral restriction

Yes, but just because of the hardware audio plug, not because of licensing.

In 2014, very few Android smartphones appeared with a T3RS connector with an external stereo input: Xperia Z2, Z2 tablet, Z3

As a side note, the gain of the input amplifier is adjusted to the microphone output level, and not to a linear one (for example, a CD player).

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Olimex OLinuXino A10S https://www.olimex.com/Products/OLinuXino/A10S/ has a LINE_IN connector. I have not yet learned how to access it, but it is!

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Source: https://habr.com/ru/post/972308/

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