[sdiy] saw vs ramp, audible? Scientific proof!

[Richie Burnett]

Excellent!  Pure dedication! :-)

I was going to ask Adam if British Sawtooths sounded upside down in 
Australia, but managed to resist the temptation ;-))

Happy holidays to all.

-Richie,



-----Original Message----- 
From: The SynthiMuse via Synth-diy
Sent: Thursday, December 19, 2024 10:15 AM
To: SDIY List
Subject: Re: [sdiy] saw vs ramp, audible? Scientific proof!


As a controlled experiment to prove absolutely if there was any difference 
between saw and ramp, I used a signal generator on my phone ( Samsung A15 ) 
to generate a 441Hz saw.
I positioned myself exactly 1 metre away from the sound source and listened 
*very* carefully for 10 minutes.

I then suspended myself hanging from a bar by the knees. I checked using a 
little plastic protractor that i was exactly 180 degrees inverted.
I needed to hang there for about 15 minutes with my eyes closed to overcome 
the disorientation.
Around the 10 minute mark, I'd lost feeling in my lower legs but the 
discomfort was worth it to advance the science. Did Newton complain about a 
bruised forehead? I don't think so.

Finally, I was able to concentrate on listening to the 441 Hz saw which, by 
inversion, is now obviously a ramp.

I can now give an absolute, definitive answer to the the discussion and it 
is as follows:

"Yea, they're about the same"

You're welcome.

Gerry
😀


On Thu, 19 Dec 2024, 09:38 Richie Burnett, <rburnett at richieburnett.co.uk> 
wrote:
MR wrote:

> ....Also the triangle has its overtones in other phases than the square
> for instance, so there's no way of phase-aligning
> all the traditional waveforms saw/sqr/tri/sin and get all their overtone
> phases to match. But the triangle becomes a nice
> almost-half-circular waveform if you align them!

It looks pretty much like a sinewave, but still has all the harmonics and
the timbre of a triangle.  That's pretty cool.  Another example of
substantially different looking waveforms with the same sound.  Also goes to
show that what initially *looks* like a decent sinewave can actually have
quite high distortion!

-Richie,



-----Original Message----- 
From: Mattias Rickardsson
Sent: Thursday, December 19, 2024 8:04 AM
To: Donald Tillman
Cc: SDIY List
Subject: Re: [sdiy] saw vs ramp, audible?


....Also the triangle has its overtones in other phases than the square for
instance, so there's no way of phase-aligning all the traditional waveforms
saw/sqr/tri/sin and get all their overtone phases to match. But the triangle
becomes a nice almost-half-circular waveform if you align them!

/mr





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