On 4/30/2020 7:41 PM, jimlux wrote:
This kind of analysis, of course, is why modern cellphone audio quality
is so bad. Back in the 80s, if someone had said that random consumers
would be happy with 8kbps encoding of speech they would have called them
crazy.
It's NOT the data bandwidth that's limiting intelligibility, it's the
data compression, and the breakdown in recovery with the path causes
some of those bits to be lost. It's made worse when there is noise in
the background, which uses up bits that could be used for the speech
signal. Learned this many years ago at a meeting of the Chicago chapter
of the Audio Engineering Society from a presentation by an engineer
working on exactly that. He played examples.
73, Jim K9YC
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