[BC] RE: That Guy at the PAB who inspected Dana Puopolo'sStation

[Mark Humphrey]

On Wed, Mar 4, 2009 at 8:48 AM, Mike McCarthy <Towers at mre.com> wrote:
> High data
> compression coding WILL corrupt the EAS AFSK integrity resulting is missed
> decoding. We instead opted for voice grade cards which are linear.
>
> I suspect the backfed monitored stations were sent by a highly compressed
> path and as a result, the tests sent were not decoded because the audio was
> so deeply "distorted" from the compression. There are some things which
> compression is actually harmful. AFSK encoded "data" is one of them.

So should we be concerned about decoding EAS transmissions from a
station using the HD codec at 48 kbps or less?   Have any tests been
run on this codec at the low rate used for AM IBOC to prove it is
still a reliable way to carry EAS FSK data?

Mark