Rich Adamson wrote:
300Hz is pretty high to filter out... it's still well within the rage of
voices. To compare, 300Hz is about a diatonic concert D.
POTS has been filtering out < 300HZ and > 3000HZ for years.
Only on long distance equipment, not on local plant. Ringing frequencies
of 20hz to 80hz would die if that were true.
Eh? Ringing is a 90V AC power drive on the line. It has nothing to do
with telephone audio. The audio path for two people on the sam exchange
is hard filtered at 300Hz.
Regards,
Steve
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