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Posted by Frank on 06/13/06 21:06
On Tue, 13 Jun 2006 14:24:49 -0500, in 'rec.video.production',
in article <Re: Need tone generator . . .>,
"Steve King" <steveSPAMBLOCK@stevekingSPAMBLOCK.net> wrote:
>"Neil Smith [MVP Digital Media]" <neil@nospam.com> wrote in message
>news:1ett82hmijol7e0m8s1imnla2hr08h6rgq@4ax.com...
>> On Mon, 12 Jun 2006 21:11:48 GMT, "Steve Guidry"
>> <steveguidry1@earthlink.net> wrote:
>>
>>>Not a broadcast 1khz tone generator. I've got one of those . . .
>>>
>>>I need one that will generate an 18khz pulsating tone, ala the "mosquito"
>>>device that's so popular with Welsh shopkeepers.
>>>
>>>Any ideas on where I can get one of those ?
>>
>> TheRegister story today has a link to the BBC website which has an MP3
>> http://www.theregister.co.uk/2006/06/12/ringtone_adults_cannot_hear/
>>
>> Cheers - Neil
>> ------------------------------------------------
>> Digital Media MVP : 2004-2006
>> http://mvp.support.microsoft.com/mvpfaqs
>
>It appears to be a 15 kHz tone modulated +/- 150 Hz at a rate of 1 kHz. I
>was amazed that I could hear it just fine with monitors at normal level.
>
>Steve King
Just for the record, the audio file linked to from The Register
article, although having a .mp3 extension, isn't actually MPEG Layer 3
encoded.
It's actually an MPEG-1 Layer 2 file and should really have a .mp2
extension.
I think that the fundamental is higher than 15 kHz though; perhaps
more in the neighborhood of 16 kHz, but I don't have the time for a
more thorough analysis.
Like Steve, I too was able to hear it using just my usual setup of JBL
monitors driven by a Crown amp, let along through electrostatic
headphones, and I'm not exactly a spring chicken any longer. :)
--
Frank, Independent Consultant, New York, NY
[Please remove 'nojunkmail.' from address to reply via e-mail.]
Read Frank's thoughts on HDV at http://www.humanvalues.net/hdv/
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