Speakers for High Frequency Sound

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

In article <0alq0115bdj2674s2tnrn4cg43bshqngnf@4ax.com>,
jfields@austininstruments.com says...
> >I can also hear LCD screens, but that's at a lower pitch, I think, and
> >they are much quieter. I first noticed it when I was in a nature park.
> >It was very quiet outside, so as I raised my digital camera up to take
> >a picture, I could distinctly hear the LCD screen.
>
> ---
> you may have crosstalk between your vision and auditory systems.

You are probably hearing the backlight of the LCD. Some of them can be
quite loud. Now that digital watches always use Indiglo backlights, I
can hear them, and I actually had to get rid of a caller ID unit that
lit up every day at 2am because the phone company reset the line. It
kept waking me up.

--
Jay Levitt |
Wellesley, MA | Hi!
Faster: jay at jay dot eff-em | Where are we going?
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pooua@aol.com wrote:
>>How many of you have heard a high-pitched "sound"
>>very much like 15 KHz yoke, even though there is no yoke? This is
>>sometimes called "ringing in the ears", and is what I was thinking of
>
> when
>
>>I asked those questions about tinnitus.
>
>
> Yes, I do have ringing in my ears, but it is fairly quiet. That's one
> way I can distinguish it from the sound of the TV. The TV set sounds
> very loud, so loud that I can hear it 15 feet away through the walls
> and closed windows of buildings, or from about 50 feet away in an open
> space.
>
Sounds like you have a hearing defect
you should be wearing filtering ear protection so you are not getting so
much useless information
hearing things you shouldn't is just as bad as not hearing things you should
you need to see a good audiologist
to get this fixed
George

 

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> E.g. George Martin was a famed record producer but was essentially deaf in
> one ear !
>
>
> Graham
>
>

I knew I would be compared to Sir George Martin some day.

george

 

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<pooua@aol.com> wrote in message
news:1108165220.798267.223400@c13g2000cwb.googlegroups.com...
> Some people can hear an extremely high-pitched sound generated by
> television CRTs and television cameras. I have long wondered what
> frequency this sound is. So, I am looking around for test equipment to
> help me measure it. I plan to use an audio generator (which I can buy
> for about $200), but I need to find a set of headphones that can
> produce sound at these high frequencies. The low end frequency should
> be about 12 kHz, and I would like to be able to go at least to 50 kHz.
> I am guessing the sound is somewhere around 40 kHz.
>
> Incidentally, I just got my hearing checked by my ENT (Ear, Nose,
> Throat doctor). I measured in the 5-to-10 dB range on both the eardrum
> and nerve conduction tests across the entire measured frequency range
> (up to 8 kHz for eardrum, 12 kHz for nerve conduction). My doctor said
> that they want to see values less than 20 dB, so I am well-within the
> safe zone, as far as they are concerned. However, one reason that she
> scheduled this test for me is that I complained that I am going deaf in
> one of my ears. I have almost completely lost my sensitivity to the
> ultra-high pitched sound in that ear. I can hear that sound 100 times
> better from my other ear.
>
> People don't realize what a difference it makes to a person's
> perception when the range of hearing differs. I can walk into a room
> with other people, and they think they are in an empty room. If there
> is an operating television in the room, I will be aware of almost
> physical contact. Other people can hold a conversation in a normal
> voice, but I have to listen over a sound similar to a dentist's drill
> or a jet engine. After several minutes of that, I often feel dazed. No
> one else even notices anything, except maybe that I am acting a little
> more odd than normal.
>

You can find headphone frequency response graphs for various brands with
Google : there are hi-fi equipment reviews on the Net.

For detetecting that high frequency limit, any headphone will work because
the ear response drops so sharply at the upper point that the variations in
headphone response don't influence the upper point you will detect. You can
get some mid-price headphones if you want something nicer, but you will get
the same result. Even a cheap loudspeaker will do - recently I put a cheap
speaker on my audio generator and compared my upper frequ with my son's - I
was 13KHz vs his 18KHz.

If you want to plot your frequency response rather than just find your upper
limit, then you need to reduce the generator output at each frequency to
find the point where the sound just becomes inaudible. To do that you need
a generator with an accurate attenuator or meter, and you plot the output
level at each frequency on a graph. A $200 generator won't have this kind
of accurate attenuator or output meter, so it will just give you an upper
limit. To plot a response graph you will want headphones with a decent
response.

Roger

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

Pal M is 15.750 KHZ

Have a look at
http/www.infocellar.com/television/committees.htm

for the other international versions of television for horizontal frequency.

Rgds:
Eric

 

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Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

>
> George !
>
> Are you thinking of taking up a new role as a comedian ?
>
> I loved that response.
>
>
> Graham
>

Well i got the looks for it

A face meant for a career in radio
G

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

>
> You mean you have diffiiculty with large background levels of noise ? Can't
> 'reject' it ?
>
> Me too. You have high hearing acuity. Your ears are 'wide open' to stimuli.
> May ppl simply 'filter out' what they're uninterested in.
>
>
> Graham
>
>

It sounds like a defect in his hearing, imagine if someone could see
outside one octave of visual information
that would also be considered abnormal, and actually possibly harmful to
their existence
if the sound of the tv whine drowns out normal conversation , you have a
problem
George

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

>> That would mean there is an upper limit.

>Thus, I falsify the claim that "there is no physical
>mechanism that would prevent a human from
>hearing higher frequencies."

No, you would be falsifying a claim that there is no upper limit. But,
that wasn't the statement you were challenging. You were challenging
the statement that there is no physical mechanism preventing humans
from hearing higher frequencies. These are not equivalent statements.

>That's all I set out to do.

Congratulations.

>>It does not at all tell us that no one could hear
>>higher frequencies than 20 kHz.

>That's a different question.

It's the same question. Someone said that humans cannot hear above 20
kHz. I said there is no physical mechanism that prevents them from
hearing higher frequencies. You were not addressing the same subject as
we had been discussing.

>There are some pretty obvious ways to find
>people who can hear frequencies above 20 KHz.
>One is to simply jack up the intensity, and another
>is to use young people whose ear structures are
>simply smaller.

So, there are people who can hear above 20 kHz. That is the point I am
making.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

You are probably corrrect. The sound of my Olympus C-3040 LCD display
is not terribly high-pitched, but it is faint.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

That is interesting. I have read that a newborn baby can hear the sound
of a mosquito on the other side of a closed window. I've also read that
ultrasounds on the fetus might harm the unborn child's hearing. But, I
do not recall having read that some children can hear 40 kHz.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

I just had my hearing tested last week, and they found nothing wrong.
But, it is a fact that sometimes when I get very hungry, I also get a
ringing in my ears that goes away if I eat something, like a spoonful
of peanut butter.

I am wearing earplugs right now, as I often do when I am using my
computer. I have the CPU set on my desk right in front of me because I
often need to get inside the case. Additionally, I have a HEPA air
filter on the other side of the room, and sometimes I run a small
ceramic heater next to my chair. All of this adds to the noise level,
especially at the high frequency range. The bearings on all the
spinning things inside my computer make a lot of high frequency noise.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

How likely is it that a TV produces sound at more than one frequency?

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

Going from memory (because I don't feel like looking it up right
now)...

Most humans can see in 3 basic colors. This is because most humans have
3 basic color receptors. However, there are some women (and it must
always be a female human who is so affected) can see in 4 basic colors.
This is a fairly rare deviation.

I saw something just the other day about some people seeing outside the
usual spectrum. I didn't take the time to read the articles, though.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

"Sbharris[atsign]ix.netcom.com" <sbharris@ix.netcom.com> wrote:

>Question #3. Is related to why transformers and many other devices hum
>with the frequency of the energizing AC.

I thought they hummed because they did not know the lyrics.
--
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[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

> I actually had to get rid of a caller ID unit that
> lit up every day at 2am because the phone
> company reset the line. It kept waking me up.

That would be a drag!

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

> Ribbon HF drivers can easily do that
> contact SLS loudspeakers
> they can sell you a unit for about 100$ that will go to 40K

Thanks, George. Ironically (considering the size of this thread), this
is exactly the information that I need.

I will check out SLS loudspeakers.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

You make good points, Jay. Please understand, though, that after 40
years of almost every person I've met (and I've worked with electronic
techs, too) telling me that they don't hear anything at the same time
that I hear a screaching loud sound, it is difficult for me to accept
that now everyone hears this sound.

 

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Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

"George Gleason" <g.p.gleason@worldnet.att.net> wrote in message
news:HpmPd.197843$w62.4434@bgtnsc05-news.ops.worldnet.att.net...
>
>> E.g. George Martin was a famed record producer but was essentially deaf
>> in
>> one ear !
>>
>>
>> Graham
>>
>>
>
> I knew I would be compared to Sir George Martin some day.
>
> george

Excerpt from encyclopedia entry: "George Gleason has often been compared to
Sir George Martin, due to both being named 'George'; and further, due to
both men's surnames ending in the letter 'n' "

Neil Henderson

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

> DO YOU HEAR THAT NOISE WHEN THE TV IS OFF?????????
> Will you please answer that question?

Sure.

No.

I said that I could hear the sound when someone turns on a TV. That
should imply that I don't hear it when the TV is off.

> Three days now, you've been annoying people with speculation about
what
> that ringing in your ears is - TURN THE DAMN TV OFF! And _THEN_ see
if
> you still hear the ringing. If you do, you need medical attention.

I'm sorry that I've annoyed you. I have to say that I have found some
of the replies to my posts interesting and maybe even useful.

> Good Luck!

Thanks.

 

[Guest]

Archived from groups: rec.audio.pro,sci.electronics.design,sci.med (More info?)

Neil Henderson wrote:
> "George Gleason" <g.p.gleason@worldnet.att.net> wrote in message
> news:HpmPd.197843$w62.4434@bgtnsc05-news.ops.worldnet.att.net...
>
>>>E.g. George Martin was a famed record producer but was essentially deaf
>>>in
>>>one ear !
>>>
>>>
>>>Graham
>>>
>>>
>>
>>I knew I would be compared to Sir George Martin some day.
>>
>>george
>
>
> Excerpt from encyclopedia entry: "George Gleason has often been compared to
> Sir George Martin, due to both being named 'George'; and further, due to
> both men's surnames ending in the letter 'n' "
>
> Neil Henderson
>
>

LOL
Thanks
G