[Elecraft] Fw: [K3] Hearing aids, meet K3

[tnnyswy at yahoo.com]

>>>  No hearing aids yet. <<< 

When was the last time you told somebody that their audio is too bassy? 

((((73)))) Milverton





>________________________________
> From: Richard Fjeld <rpfjeld at embarqmail.com>
>To: elecraft posting <elecraft at mailman.qth.net> 
>Sent: Thursday, August 8, 2013 4:46 PM
>Subject: [Elecraft] Fw:  [K3] Hearing aids, meet K3
> 
>
>I've been trying email clients, and had a cockpit error. I wanted to make a couple comments.  
>
>First to Alan, N5ILN, I do have a copy of Schrader's 'Electronic Communications".  I agree.
>
>Then, this story:
>I began using my laptop at my daughter's house. Pretty soon, people from all over the house, even from downstairs, converged on me asking why the laptop was making such a terrible screeching noise.  They couldn't tolerate it.  I wasn't hearing a thing.  I hit the mute button and they were happy again.  No hearing aids yet.
>
>I wonder if that affects my preference for CW sidetone around 600 Hz.  I think that is normal??
>
>Dick, n0ce
>
>  ----- Original Message ----- 
>  From: Jim Brown 
>  To: elecraft at mailman.qth.net 
>  Sent: Wednesday, August 07, 2013 4:23 AM
>  Subject: Re: [Elecraft] [K3] Hearing aids, meet K3
>
>
>  On 8/6/2013 8:45 PM, Don Wilhelm wrote:
>  > I may b unique because my lower range hearing without the aids is 
>  > normal, so I have built-in low pass filters in my ears.
>
>  That's entirely normal, Don. In general, hearing loss starts at the high 
>  end and moves down.  Many folks with a lot of hearing loss still hear a 
>  lot of low end. The exception is when for one reason or another we are 
>  exposed to strong noise at a specific frequencies, or a specific range 
>  of frequencies, in which case we develop a notch in that range.
>
>  The problem is that speech intelligibility depends on sounds in the 
>  range of 500 Hz - 4 kHz, with the 2 kHz octave being most important, the 
>  1 kHz octave close behind.  That's why telephones and ham radio, with 
>  bandwidth limited to about 500 Hz to 3kHz,  work just fine. Energy above 
>  4 kHz helps, but energy below about 350 Hz makes no contribution, and 
>  often makes things worse.  The scientists at Bell Labs figured this 
>  stuff out early in the 20th century.
>
>  73, Jim K9YC
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