Re: Button events from headphone+micro combo
David wrote:
> On Sat, 27 Mar 2021 at 06:29, <tomas@tuxteam.de> wrote:
> > On Fri, Mar 26, 2021 at 03:05:58PM -0400, Dan Ritter wrote:
> > > Stefan Monnier wrote:
>
> > > > >> My Librem mini comes with a an audio jack in the front into which I can
> > > > >> connect the same headphones-with-micro as used typically on phones.
>
> > > It's entirely possible that the Librem doesn't have a sound chip
> > > that translates impedance changes to button clicks. You could
> > > ask the hardware folks, right?
>
> > Ugh. A construction like this [1], where the mic is shorted with
> > varying resistors to transmit signals?
>
> > Ugly hacks folks come up with, that :-/
>
> I do not consider this to be ugly, at all. I am a hardware engineer.
>
> Given that the headset cable must be flexible, robust, and tiny diameter,
> it would be suboptimal to add dedicated wires for signalling. The reliability
> of both connector and cable would be compromised.
>
> I don't understand why anyone would think this is ugly, or what would be
> less ugly. If it is an aversion to analog electronics, don't forget
> that "digital"
> electronics is an abstraction. And underneath that, everything is analog.
It's also the case that the one time this interferes with the
signal is when the button is connecting the resistors -- which
is the one time that nobody cares about sound quality.
-dsr-
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