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On 21 July 2011 07:19, Matthew Turnbull wrote:
> [s] and [f] are hard to distinguish over a phone line, or so I've read in
> several reputable places, because phone carriers don't bother to
> transmit very high frequency noise over the phone lines to save on
> the amount to information that they need to convey
[snip]
> I belive they cut it off around 3000 Hz or maybe 3500 Hz

POTS transmits 400Hz to 3400Hz.

Yuri de Groot
Telecommunications Technician (i.e. Linesman for the Post Office)