[Elecraft] Copying CW and Pitch

[Drew AF2Z]

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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