Vahan Yerkanian wrote:
Steve Underwood wrote:
With most cellular base stations each press of the buttons on the
phone produces a fixed length DTMF pulse, with a fixed silence
following it. If you press keys in quick succession, they are
buffered up, and played out as tones at the pace the base station
sees fit. Typically they make the tones very long, for some reason.
0.5 seconds in many cases. I think your application sounds broken by
design. I've been through this before, trying to build things which
require rhythmic input. It just doesn't work, unless your application
is limited to plain old analogue land line phones.
DTMF buffer is another useful thing - currently digits sent too fast
are guaranteed to be skipped. Ironically, I never get a double or
skipped digits from cellular networks - these send DTMFs with loooong
durations as the developers have accounted for lossy nature of the
cellular technology.
The lossy nature of cellular networks has no impact on DTMF. The phones
do not generate DTMF. The base stations do. The phones merely send
messages saying "user pressed one", "user pressed five", etc. and they
don't tell the base station how long it was pressed for. The base
station generates the DTMF tone in a non-lossy environment.
Steve
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