[Elecraft] Headphones

[Kjeld Holm]

Dear All,

 

For your information

 

The Danish company Phonak are selling a device under the name of TVLink
which plugs into the line out, Scart, headphone or external speaker
connector and from it's console sends in stereo to your hearing aids. I have
not tried it yet - so I cannot say anything about how it performs. The price
is 3000 DKK around 450 EUR.

 

Vy de

OZ1CCM, Kjeld                                      

 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brown
Sent: 10. juli 2011 22:02
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Headphones

 

On 7/10/2011 10:46 AM, Edward R. Cole wrote:

> I have followed the critiques on the reflector for headset-boom mics 

> but have not bought any.  Mostly the reports are on audio performance 

> and not comfort.

 

Hi Ed,

 

The Yamaha CM500 is quite comfortable.  In the 18 months so that I've owned
mine, it's become my only radio headset, and I often do weekend contests
that keep me in the chair for 15-20 hours (and sometimes as long as 30
hours) in a weekend.  The large Sony phones (MDR7506 and the consumer MDR
equivalent) are also quite comfortable.

 

Some thoughts about using headphones WITHIOUT your hearing aids in place.
The condition you've described of very strong loss of hearing above
500-1,000 Hz is characteristic of the vast majority of people with enough
hearing loss to use (or need) a hearing aid, but the details of the response
shape varies greatly depending on many factors, including the noise to which
the victim has been exposed over the years, and various medical/physical
factors.

 

  A good hearing aid will include equalization customized to the hearing
loss of each ear to try to restore something approaching "normal hearing."
The RXEQ section of the K3's signal processing can take a major step in this
direction. A hearing impaired user should set the lower four frequency bands
to their lowest settings and boost the top two bands.  Since ham
communications, by their nature, have limited audio bandwidth, there's no
benefit from boosting frequencies higher than 4kHz.

 

One thing I WOULD strongly suggest, if it's practical, is for Elecraft to
add an optional DSP setting for hearing impaired individuals that would do
some simple but strong low-cut and some general contouring of the spectrum
above 500 Hz.

 

In general, the biggest single thing we can do to improve speech
intelligibility is to minimize the bass content (below about 350-400 Hz) so
that these sounds, which do NOT contribute to speech intelligibility, don't
waste audio power that can be used for the higher frequency sounds that DO
carry intelligibility.

 

73, Jim K9YC

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