Sky Frequency Affecting Some Children?

djpaul

A story on the big bite programme yesterday about children who have
Auditory Sensory Defenceifness. One person said that their Autistic brother
(teenage) was affected by the skybox when switched on, he would put his
fingers in his ears to block out the sound, no matter where he was in the
house. I have noticed this with my own son who would sometimes clear the
room when music or ads would come on and put his fingers in his ears to
block out the sound.

Anyone else hear anything about this?

Comments please.

dancin

Do you mean something built into the signal? (the way ADSL is on a higher frequency on the phone line for broadband while youa re on the phone). Or the whining noise the electronics and/or the fan makes?

I can hear a lot of electronics in my house whining when powered up, but my wife cannot (can't speak for the kids). The SKY+ box is annoying, but definitely not enough to cause problems.

djpaul

dancin wrote:

Do you mean something built into the signal? (the way ADSL is on a higher frequency on the phone line for broadband while youa re on the phone). Or the whining noise the electronics and/or the fan makes?

I can hear a lot of electronics in my house whining when powered up, but my wife cannot (can't speak for the kids). The SKY+ box is annoying, but definitely not enough to cause problems.

Yeah, in the signal, you know like when dogs hear dog whistles but the human
ear hears nothing, except those with auditory problems.

watty

Switch mode Power supply Whine.

It is usually a higher frequency.

Also the TV scan coils and HV LOPT vibrate at 15.625KHz. Kids can hear it but not adults.

It is nothing to do with Sky per se.

The Sky+ box also has noise and harmonics from the 5400 RPM or 7200 RPM disk drive.

watty

Adverts etc use "compression" to create a higher average sound to make seem much louder than the program. This also creates distortion and makes voices and music more shrill. Give the advertisers what they deserve for that, quickly hit mute.

Sponge Bob

A guy invented that to get rid of teenagers see

http://www.iviewcameras.co.uk/IV_CS_MOSQUITOCCTVSystemsdeals.htm

Teenagers . c 15 . have the widest frequency range and can hear sounds just over 20Khz , persons in their 20s who have not hammered the ears with walkmans may hear the 15khz range that Watty alluded too.

This condition is not a deficiency, its a feckin feature of a teenage ear.

By the time you get to Wattys age you can hear feck all

Sparky

Yeah when I was younger, I could hear the whistle of the tv upon power up. Still can infact.

Ulsterman 1690

When I was a kid I could stand outside someones house and tell if they were watching TV from the noise the LOPT's made (If the TV licence guys were willing to employ child labour I could have made a fortune )

Dunno If TV's have got quieter or Ive got deafer (probably both) but I have to be in the same room as the TV now and even then can only hear some models

Im told that 405 line TV's (10125 KHz) were even worse !


As for accellerating hearing loss I think loud music in pubs/nightclubs/gigs/concerts is probably responsible for a lot more damage than walkmans (at least one can control the volume on a walkman. Short of voting with ones feet there isint much one can do about the loudness at venues !)

The mosquito device you mention sounds interesting (wonder if the police could use it against rioting spides ?) but I cant see it being 100% effective and could also affect teenagers/older people with good hearing who are legitimately passing by, shopping, living near, or even working in the shops in question (or shopping in nearby shops) Ive heard of railway stations and shopping centres using classical music and/or Bing Crosby, Frank Sinatra etc for the same purpose.

djpaul

Thanks guys;)

Ulsterman 1690

Used to know this kid who had downs syndrome and anything flickery like a faulty fluorescent tube or the picture on the TV when one put the video on pause would disturb him badly. Ive also heard that TV producers have to take care with strobing light in pictures as certain rates/colours can trigger seizures in people with epilepsy (apparently there are guidelines set down by Ofcom etc).

I gather its something to do with relationships with brainwave frquencies but Im a bit hazy on the details

marclt

Ulsterman 1690 wrote:

I gather its something to do with relationships with brainwave frquencies but Im a bit hazy on the details

Ulsterman, I used to be able to stand outside other people's houses and tell if their telly was on too.. I'd only just remembered that one!!!! How strange. I can just about hear the whistling of the tv nowadays... Although I always felt it was more like a sensation rather than a noise as such.

Now, If I could stop hearing my very old Dell from whining that would be something!!!!

watty

Sponge Bob wrote:

A guy invented that to get rid of teenagers see

http://www.iviewcameras.co.uk/IV_CS_MOSQUITOCCTVSystemsdeals.htm

Teenagers . c 15 . have the widest frequency range and can hear sounds just over 20Khz , persons in their 20s who have not hammered the ears with walkmans may hear the 15khz range that Watty alluded too.

This condition is not a deficiency, its a feckin feature of a teenage ear.

By the time you get to Wattys age you can hear feck all

Watt y he say?

yes One of the MAC computers has a really noisy Powersupply. google and you will find pleanty of gripes.

Some Power Supplies I can hear them! I hear a "Peep!" from the power unit in my sat receiver just as the dish motor powers up. The sudden 2x to 6x normal motor start current causes the Switch Mode Power Supply frequency to momentarily drop, from probabily 60KHz to 10Kz or 12KHz.

I have designed 1MHz minature power supplies, Not even Dogs, Bats or Guinea Pigs will hear those.

Anyway to reiterate:

IT IS NOT a Sky Frequency or ANYTHING to do with sky The issue is poorly designed Switch Mode Power Supplies not running at a high enough frequency.

Sponge Bob

Ulsterman 1690 wrote:

The mosquito device you mention sounds interesting (wonder if the police could use it against rioting spides ?)

Skangers we call them, its a short range device suited to the crevices they go 'bushing' in really.:p

When I was about 15 and was at my max hearing response range I could hear morse codeish transmissions sometimes, lasted maybe a year and then the progressive decline set in ......whats around 20-21khz Watty underwater submarines ???

watty

Submarines. But the havn't used morse for maybe 30 years. Are you that old?

Could have been something else. You can't hear even 10kHz Radio directly.

Discovery channel debunked the Rf reception by tooth which apparently Lucy Ball ("I love Lucy") started that urban myth.

legend99

Ulsterman 1690 wrote:

Used to know this kid who had downs syndrome and anything flickery like a faulty fluorescent tube or the picture on the TV when one put the video on pause would disturb him badly. Ive also heard that TV producers have to take care with strobing light in pictures as certain rates/colours can trigger seizures in people with epilepsy (apparently there are guidelines set down by Ofcom etc).

I gather its something to do with relationships with brainwave frquencies but Im a bit hazy on the details

Doesn't the wrestling stuff on Sky Sports always give a warning about strobes...and that program that used be on...was it men and motors or Bravo...the 2 or 3 interviewers going around nightclubs in the UK interviewing people and giving them a choice of question that had 2 brutal alternatives...what was it called...anyway, that used flash up a warning saying strobes were immenient.
As an aside, in bad cases, a seizure can result from something as simple as driving past trees when the sun is shining as a strobe effect can be caused by the sun shoning through the tree branches.

Sponge Bob

strobes are a visual noise because they flash at c 25 times a second and produce a cognitive dissonance in some that can lead to an epileptic attack however we are talking about audible noises , particularly those that only a teenager can hear because the 15 year old (or so) human has a much wider frequency range than an adult does.

daveirl

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Sponge Bob

daveirl wrote:

This post has been deleted.

Thats not unusual either . There is a pretty good short explanation here with more linkees

http://www.silcom.com/~aludwig/EARS.htm#The_audio_spectrum

It could be that those sounds which cause discomfort to some are as high as 40Khz and not just above 20Khz as I said above. In other words if a teenager complains about 'hearing things' they are probably absolutely right.

If they are 'seeing things' its probably an illegal hallucinogen

JohnDigital

Sparky-s wrote:

Yeah when I was younger, I could hear the whistle of the tv upon power up. Still can infact.

I still can, and Im 31! It always bugged me when I was younger, the TV's in my parents house always used to make loads of buzzing noise, but I was the only one who could hear it. That's mad, I never knew why until now.

ethernet

Sparky-s wrote:

Yeah when I was younger, I could hear the whistle of the tv upon power up. Still can infact.

I'm still young! I can hear the same thing. Also hear a little noise when someone turns on teletext. Annoying to say the least.

telecinesk

405 Line tv, oh yes that was quite loud alright.
As for the sky thing, Watty's right, the switchmode power supplies have a lot to answer for. Theyre so badly made, screened and noisy as hell. I can tell when Im driving my diseq motor across the horizon, the dbox2 screams at me..And thats a Nokia!
Sky tv affecting some children, well Id say the program content is enough to affect anyone. Its not missed here...

watty

405 would be 10.125 KHz compared with 15.750 KHz for 525 line NTSC, 15.625 for 625 lines PAL and 20.475 for the old 819 line french B&W TV.

VGA is 31.5 KHz (525 line progressive 480 line visible)
Old Analog NHK HDTV 33.750 KHz (1125 line interlaced, 1080 visible) (needed over 20MHz copared with 5.5MHz of regular TV)

QXGA on analog CRT is 101.25 kHZ approx at 60Hz refresh, or 168.75 approx at 100Hz refresh.