My default sidetone pitch is 440 Hz, which is plenty sufficient (for me)
to discriminate between two very close signals signals, if they are not
too unequal in strength.
I am more interested in choosing the optimum pitch for particular filter
bandwidths and QRN conditions rather than for discriminating between
multiple stations. I suppose the wpm speed of the CW signal might also
come into play in optimum pitch selection. This is probably more
complicated than just "lower is better".
I'm looking forward to "live" adjustment of signal pitch on the K4.
Seems to me that adjusting the pitch of the signal would be the natural
final tweak needed to enhance it.
73,
Drew
AF2Z
On 03/13/21 18:44, Jim Brown wrote:
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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