From Newsgroup: uk.d-i-y

On 06 Aug 2026, Davey wrote

On Thu, 06 Aug 2026 09:10:12 +0100
HVS <office@REMOVETHISwhhvs.co.uk> wrote:

On 05 Aug 2026, Davey wrote

On Wed, 5 Aug 2026 20:30:43 +0100
John Rumm <see.my.signature@nowhere.null> wrote:

On 04/08/2026 15:10, The Natural Philosopher wrote:

On 04/08/2026 14:42, nib wrote:

Modern TVs of course don't have the high-pitched line-scan
frequency (that I could just about sense when I was much
younger) that a dog might not like. Switch-mode power supply
frequency?

Its possible

Generally these days SMPS's are well over 50kHz tho

Its quite common to have lots of switching voltage converters
littered over the digital PCBs after the main PSU as well. Even
if the switching frequency is well out of the (dog's) audio
range, there might be beat frequencies generated that are not.

So the dogs have access to their own beatbox, with moving images?
<g>

But only in black and white?

Well, although they fail in the red and green departments, they are
fine with blues and yellows.

So it's kind of like watching black and white telly with one of those
plastic screens that you put in front of it in the 1960s/1970s to see
it in "colour"?

(FWEW, I was aware of those at the time from magazine advertisments,
but never saw one in real life.)

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From Newsgroup: uk.d-i-y

On Thu, 06 Aug 2026 13:57:51 +0100
HVS <office@REMOVETHISwhhvs.co.uk> wrote:

On 06 Aug 2026, Davey wrote

On Thu, 06 Aug 2026 09:10:12 +0100
HVS <office@REMOVETHISwhhvs.co.uk> wrote:

On 05 Aug 2026, Davey wrote

On Wed, 5 Aug 2026 20:30:43 +0100
John Rumm <see.my.signature@nowhere.null> wrote:

On 04/08/2026 15:10, The Natural Philosopher wrote:

On 04/08/2026 14:42, nib wrote:

Modern TVs of course don't have the high-pitched line-scan
frequency (that I could just about sense when I was much
younger) that a dog might not like. Switch-mode power supply
frequency?

Its possible

Generally these days SMPS's are well over 50kHz tho

Its quite common to have lots of switching voltage converters
littered over the digital PCBs after the main PSU as well. Even
if the switching frequency is well out of the (dog's) audio
range, there might be beat frequencies generated that are not.

So the dogs have access to their own beatbox, with moving images?
<g>

But only in black and white?

Well, although they fail in the red and green departments, they are
fine with blues and yellows.

So it's kind of like watching black and white telly with one of those plastic screens that you put in front of it in the 1960s/1970s to see
it in "colour"?

(FWEW, I was aware of those at the time from magazine advertisments,
but never saw one in real life.)

I saw one once, it said: "Best installed while a scene with grass and
blue sky are showing". That really inspired confidence.
--
Davey.

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From Newsgroup: uk.d-i-y

On 4 Aug 2026 12:29:22 GMT, Tim+ <timdownieuk@yahoo.co.youkay> wrote:

Today I realised that the point where she gets nervous has a lot of bats >flitting around.

I have an (Android) smartphone app that shows the waterfall spectrum of the sounds picked up by the microphone. Maximum frequency is determined by FFT settings, looks like goes to 10 kHz on default settings, and 20 kHz or more on custom. ISTR bats echolocate even thinner than that, but use lower-frequency sounds to communicate. "Spectroid", free.

Might show the presence of high-frequncy sounds?


Thomas Prufer
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From Newsgroup: uk.d-i-y

On 12/08/2026 08:53, Thomas Prufer wrote:

On 4 Aug 2026 12:29:22 GMT, Tim+ <timdownieuk@yahoo.co.youkay> wrote:

Today I realised that the point where she gets nervous has a lot of bats
flitting around.

I have an (Android) smartphone app that shows the waterfall spectrum of the sounds picked up by the microphone. Maximum frequency is determined by FFT settings, looks like goes to 10 kHz on default settings, and 20 kHz or more on
custom.

subject to the (probably unknown) frequency response of the microphone ??
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From Newsgroup: uk.d-i-y

On 12/08/2026 09:07, Abandoned Trolley wrote:

On 12/08/2026 08:53, Thomas Prufer wrote:

On 4 Aug 2026 12:29:22 GMT, Tim+ <timdownieuk@yahoo.co.youkay> wrote:

Today I realised that the point where she gets nervous has a lot of bats >>> flitting around.

I have an (Android) smartphone app that shows the waterfall spectrum
of the
sounds picked up by the microphone. Maximum frequency is determined by
FFT
settings, looks like goes to 10 kHz on default settings, and 20 kHz or
more on
custom.

subject to the (probably unknown) frequency response of the microphone ??

Yes, but most things don't 'fall off a cliff; outside the indicated
spectrum
--
rCLit should be clear by now to everyone that activist environmentalism
(or environmental activism) is becoming a general ideology about humans,
about their freedom, about the relationship between the individual and
the state, and about the manipulation of people under the guise of a
'noble' idea. It is not an honest pursuit of 'sustainable development,'
a matter of elementary environmental protection, or a search for
rational mechanisms designed to achieve a healthy environment. Yet
things do occur that make you shake your head and remind yourself that
you live neither in Joseph StalinrCOs Communist era, nor in the Orwellian utopia of 1984.rCY

Vaclav Klaus

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From Newsgroup: uk.d-i-y

On Wed, 12 Aug 2026 09:07:11 +0100, Abandoned Trolley <that.bloke@microsoft.com>
wrote:

On 12/08/2026 08:53, Thomas Prufer wrote:

On 4 Aug 2026 12:29:22 GMT, Tim+ <timdownieuk@yahoo.co.youkay> wrote:

Today I realised that the point where she gets nervous has a lot of bats >>> flitting around.

I have an (Android) smartphone app that shows the waterfall spectrum of the >> sounds picked up by the microphone. Maximum frequency is determined by FFT >> settings, looks like goes to 10 kHz on default settings, and 20 kHz or more on
custom.

subject to the (probably unknown) frequency response of the microphone ??

Of course. It's a very small microphone, so more likely to pick up high frequencies than a large one. (And: calibrated microphones are expensive!)

(Reading the comments on Spectroid, it seems that an older version allowed mic calibration...)


Thomas Prufer
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