I know the microphone for my Kenwood TM-241a uses resistors and must
measure the voltage to figure out which button is pressed. Though, the
radio does have a low speed serial interface on the mic plug for a couple
of interfaces that they once sold, such as an external face and a device
that looked like the handset on an old bag type car cellphone. I've managed
to figure out some specifics of that, but I don't know the format of the
control data passed from the remote interface to the radio. :/
Some sort of standardized interface between radios, not only for remote
control and display but also for mic and speaker audio would be amazing.
Have one head unit and mic connected to several radios for different
frequencies and modes.
James
On Wed, Dec 7, 2011 at 1:22 PM, Bruce Perens <br...@perens.com> wrote:
> Microphones with device control buttons have many potential means of
> communicating with the system they're plugged into. But few *standard *ways.
> Most are device-specific and undocumented.
>
> That's not necessary today. Look how cheap USB keyboards are. Many
> microprocessors in the $1 class can run slow-speed USB just fine.
> Microphones should use USB for their button interface, and implement the
> HID protocol as keyboards, mice, dials and joysticks do. This allows the
> device to discover what's plugged into it, and use it appropriately. You
> can also digitize voice right in the microphone, and use the standard USB
> connector.
>
> For an example, see http://www.americandictation.com/olympus-dr-1200
> They don't really have to cost $250 the way that one does.
>
> Thanks
>
> Bruce
>
>
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