Electronics > Beginners
How much can be reverse engineered from sound ?
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lordvader88:
given the task to make the machine that made this amazing sound, what wound the best science of today do ? or i suppose they would guess it's an f1 engine and just start there



lordvader88:
i wonder what it looks like on an o-scope
windsmurf:

--- Quote from: lordvader88 on May 17, 2019, 10:11:28 pm ---i wonder what it looks like on an o-scope

--- End quote ---

Audacity
Audioguru:
The dinky little V6 engines on today's F-1 cars do not sound like that. But there are many stupid noisy cars and motorcycles in my city or they drive through my city and they sound deafening like that.
I wonder why many cars make almost no noise?
Brumby:
Very simple.  It's the exhaust system.

Some years ago I spent a couple of years in a "sea-change" job working for a mechanic.  He was an approved examiner for several things, including noise pollution.

One day, a Ferrari came in having been reported for noise and even at idle, the sound level nearly cracked the limit - but it did sound sweet.  The exhaust system was a custom/after market job worth more than $10K and it was suggested he refit the factory exhaust.  He did this and came back - but it failed the sound test.  Turns out that the factory system had vanes that could provide a more direct (and thus noisier) path for the exhaust gases when high performance was required, instead of the more circuitous and quieter path for sedate motoring.  This is what killed his chances of passing  the test.

He went away once more and had these vanes disconnected from the control system and fixed in position for the circuitous path.  This time, the vehicle passed the test - just - but it sounded like and asthmatic dog with a hessian bag over its head getting strangled.  The sound was just "wrong" in every way imaginable.  It did not belong to a Ferrari.

And it was all affected by just the exhaust system
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