RTS CS9500, User Manual

Page: 95 / 95

.
connected to the console's logic outputs to perform this
,
function. This scheme works well for situations
as
you would have in a newsroom or production studio or for
occasional on-air
use.
A problem remains, however, when
calls
need to be taken one after
the other, as
in
a talk show situation.
In most
cases,
the hybrid
must be signalled each time is selected so that adaption
to the line can occur. It be possible to derive an appropriate
pulse from the phone by an external circuit of some
which would trigger the hybrid's remote function.
Remember too, the hybrid should be switched off or its input audio
removed when no line
is active. Otherwise, the hybrid will
proceed to adjust itself to the high impedance presented to it and
may take a few seconds to recover from
this
condition when a call
is subsequently taken. Your phone supplier may be able to
help. If you have any luck along these lines, please let us know
so
that we can produce an application note for other
users.
With phone systems that have a digital talk path, the situation
with the
control is as above with the additional
complication that you need to
find
a way to get at the converted-
signal inside the phone
set.
Perhaps some around
with
a scope or headphones may be
useful in
this
endeavor. Again, maybe your phone provider
company might help. Please let
us
know what you find!
A
universal way to obtain an audio signal from any phone
is
to
use
an
adapter which plugs into the handset jack. These should be
available from your local telephone supplier. If you have
problems finding an adapter locally, we may be able to help.
Telos ONE
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ELECTRONIC PHONE TUTORIAL