Helm of Telepathy

Step one. Take a pair of neurophones (see link) and miniaturize until they fit onto an oversized collar -- the sort of thing bondage or industrial music fans would be into. 2" with D-rings (for attaching equipment) seems right.

Step two. Take a subvocal pickup (see link) and give it the same miniaturization treatment.

Now make the two integral to a 2" wide, 1" thick collar. Brass electrodes will dot the velvet lined inner sufrace, and the outer will be nice leather decorated with runes of some sort. (Led Zeppelin Four?) Matching sets will read subvocalizations and transmit them to others, which will reconstruct them into speech and send it straight into the listener's nerves.

Solid state RF communications, mind-to-mind. With some work, it may be able to convey emotions directly without the need of inflections, which this simple version will not replicate.