Back in the 80's at the radio station I worked at there was a way to take phone line audio and increase the fidelity makijng it sound like there were not on a phone. Can't remember exactly how we did it though but we had no special equipment. Is there a way to do this in Cool Edit Pro?
Welcome to the forum.
We have sort-of covered this before, but not at all recently. Are you absolutely
sure that no other equipment was involved? If it's a POTS* line, these are bandwidth limited (approx 400Hz to 4.0kHz), and you simply can't do anything about this unless you use some external kit. There are basically two approaches: The first involves frequency shifting the audio up the band. This reduces the amount of bass frequencies present, but often makes things sound clearer. The second involves using two telephone lines, one of which is frequency-shifted (rather higher up) and the other of which either isn't, or is shifted down, so the bandwidth is extended top and bottom. The important thing about both methods is that they require equipment at
both ends of the line for this to work -
unavoidably.
A simple hybrid circuit will extract pretty much as much as there is to get from a telephone line, and apart from very minor tweaks, and possibly a bit of noise reduction, there isn't a vast amount you can do about the quality. Yes, this
is generally dire, simply because of the bandwidth limitation imposed by the phone company, and even with SW as good as CEP/AA you can't extract something out of nothing - the transmission system completely destroys the rest of the audio information.
If you are using ISDN lines, or if the phone company provide you with higher quality audio lines specially, then these constraints don't apply, of course.
*Plain Old Telephone System (really!)
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