The Black Hole......

[scottjoplin]

Indeed. But the ear/brain can discern that time difference, in the frequency domain it is up there. Take out the information the human hearing mechanism uses and a (trained listener at least) will hear the difference.

Please be more specific, exactly what time differences are you referring to?

 

[Hans Polak]

Indeed. But the ear/brain can discern that time difference, in the frequency domain it is up there. Take out the information the human hearing mechanism uses and a (trained listener at least) will hear the difference.

dave

No that’s not the case.
All our hearing nerves are not only processed individually but also physically combined in one big NAND that we use for sound attacks.
That’s the mechanism we use to hear wave fronts and temporal differences.

Hans

 

[mountainman bob]

Here You are.
I made 3 new versions, resp 18/3.6, 20/4 and 22/4.4.
All files are also in 20Khz Brick Wall filtered version.
They are now 192Khz, 32bit float, instead of the previous 16 bit versions.
And all .wav files are 35msec long, with 10msec lead in and 10msec lead out, because of the Gibbs ringing added to the time domain signal.

Dropbox - Spectra - Simplify your life


Hans

View attachment 819154

I’ve got no sound coming through on these? They download and play but no sound.

 

[planet10]

Matt,

The speed of sound is affected by temperature and humidity. Because it is less dense, sound passes through hot air faster than it passes through cold air.

So the SofS thru the denser SF6 will be slower.

From Wikipedia:Thiele/Small parameters - Wikipedia

V_as - Equivalent Compliance Volume, i.e. the volume of air which, when acted upon by a piston of area S_d, has the same compliance as the driver's suspension:

V_as = ρ x c² x S_d² x C_ms

where ρ is the density of air (1.184 kg/m3 at 25 °C), and c is the speed of sound (346.1 m/s at 25 °C). Using SI units, the result will be in cubic meters. To get Vas in litres, multiply by 1000.

So V_as is proprotional to the square of the speed of sound.

dave

 

[Hans Polak]

I’ve got no sound coming through on these? They download and play but no sound.

The lowest frequency of the 3 files is 18Khz with sidebands at 14.4 and 21.6 Khz.
That proves at least that you can’t hear 18Khz, neither can I 😀😀

Hans

 

[scottjoplin]

Thank you Dave, much appreciated 🙂

 

[scottjoplin]

The lowest frequency of the 3 files is 18Khz with sidebands at 14.4 and 21.6 Khz.
That proves at least that you can’t hear 18Khz, neither can I 😀😀

Hans

Haha, you're a funny guy, nothing to do with the fact they only last a fraction of a second? BTW I can hear them all, no problem, only thing is they all sound the same.....

 

[mountainman bob]

Yah I top out around 15k.....the last time pavel posted a 20k I cooked my tweeter voice coils trying to hear it.
I really don’t think it’s about being able to hear that high, that seems to be the disconnect.
It’s what brick walls might do to the rest of the audible signal?

 

[scottjoplin]

Yes, in the time domain, not the frequency domain, but......that's where the type of filter comes in

 

[mountainman bob]

Matt, I’m not quite sure if it’s the same but as we’ve discussed before I seem quite sensitive to phase timing relationships, I wonder if that’s the difference I’m hearing?

 

[scottjoplin]

I think that's most likely, similar to Pavel's preamps test, it would be interesting to listen to different filters. As was discussed in BT, FIR brickwalls shouldn't be audible

 

[mountainman bob]

So the measurement jockeys need to step up their game!? 😀

Too much coincidence going on here.

 

[scottjoplin]

I want to listen to a slow mo blip, if I had the means myself I would.

 

[mountainman bob]

Do you think that would reveal something clearer or just blur it?

 

[scottjoplin]

I want to hear if there is a frequency shift as has been argued (I don't believe there is)

 

[mountainman bob]

Somewhere I remember seeing a real time frequency tracker that could be slowed and sped up but can’t recall what/where?

 

[Hans Polak]

I want to hear if there is a frequency shift as has been argued (I don't believe there is)

Give me a suggestion for an audio signal that could possibly confirm the fact that no frequency shift occurs and I will provide it.

Hans

 

[scottjoplin]

Thanks for the offer Hans. Now you've put me on the spot 🙂 I'm open to suggestions but I think the frequency would have to be low enough that the envelope was not too small a fraction of it or there wouldn't be sufficient "stretching"? If we use the ratio of 4:1 as used earlier, how short an envelope could be used to discern frequency? I don't think this is going to work is it? 😱

 

[mountainman bob]

Is there a way to slow those symbol strikes from real time to a wavelet transform?

 

[gpauk]

Here You are.
I made 3 new versions, resp 18/3.6, 20/4 and 22/4.4.
All files are also in 20Khz Brick Wall filtered version.
They are now 192Khz, 32bit float, instead of the previous 16 bit versions.
And all .wav files are 35msec long, with 10msec lead in and 10msec lead out, because of the Gibbs ringing added to the time domain signal.

Thanks! I'll play with those tomorrow... Too much whisky to contemplate that tonight!! 🙂