Hello folks,
Markus and I ran also a slow-voice test this morning. Considering tha fact
that Markus' signal is only a few dB above the noise so that even his PSK31
signal did not make it 100% error-free, it was surprising to hear a human
voice far far away after doing some post-procesing with Cool Edit 2000
(slowing down to 1/4 speed, raising the pitch). My XYL Andrea and I
listened to the voice several times and were able to read the words "Delta
Foxtrott Number Six November Mike" through the noise. It reminded me a
little bit of a story I have seen on TV a while ago, where people try to
listen to voices of those who passed away using all kinds of electronic
equipment ...
But as I said, it is surprising that the voice made with 500 Hz bandwidth!
I am also preparing a test file now and will try to push it over to Markus.
Mybe it is even worth to slow down the speed by 8 times to be able to make
use of 250 Hz CW filters!
Best 73
Geri, DK8KW (W1KW)
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