Linux - Embedded & Single-board computerThis forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.
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SoC is System on Chip, but you specify 'device with audio plugs'. Are you looking for a ready-made board such as the Raspberry Pi, or a chip around which to develop such a board?
the same idea occurred to me. Speaking of which, the Raspberry Pi could be a good starting point. Natively it only has an audio "out" jack, no input. But coupled with a USB sound adapter it might be just what the OP has in mind. In Germany, these USB/Audio adapters are available at <10EUR (roughly 15US$) at some electronics dealers; I don't know about availability and pricing in other countries.
To me, the Raspberry Pi is particularly charming because of its low power consumption of about 1..2W (plus external peripherals, of course). That's less than many a TV set in standby mode.
The RPi runs X. Are you sure it has to run X, or simply run X applications? There is a significant difference, as running X implies that it can drive a monitor of some sort, and that usually requires a GPU, which puts it in a whole different category.