On 3/13/2021 10:48 AM, Sverre Holm (LA3ZA) wrote:
A CW sidetone pitch of 400 Hz is consistent with what little research there
is on this. A paper from 1992 says that "/All subjects improved their
recognition as the frequency was lowered to 500 Hz, some even at 250 Hz.
As a retired designer of large sound systems, I had to learn a lot about
acoustics and psychoacoustics (the science of how humans' ear/brain
interprets what we hear). That science tells us that, like most of our
senses, hearing is logarithmic both with respect to frequency and
loudness. This means that our discrimination of one frequency as
compared to another increases with decreasing frequency. That is, we are
better able to separate signals from each other with RX pitch set to
lower frequencies.
73, Jim K9YC
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