jon
Fractal Fanatic
Last week's gig would've been suitable for airplane flying, indoor sports hall with almost a full size sports track:
Nice!!
Last week's gig would've been suitable for airplane flying, indoor sports hall with almost a full size sports track:
Very interesting....I've been experimenting with IR length lately and keep finding that I like a shorter length. So I gave some thought to it and I think the reason is that a shorter IR trims off the early reflections.
As I stated over at TheArgumentGear Page:
That's why I said "an oval + pointed to the sky". Unless the volume has to be particularly loud?How would you stop the reflections from the ground?
Keep in mind the speed of sound and the distance involved....
A good studio and an aeroplane hanger would yield similar results due to the speed of sound.
One is cheaper and more accessible though
Yeah, I get that. I'm assuming that sound waves travel directionally though - ie the only reflections that hit the mic are those that bounced off a surface and then into the mic, which would be almost none of the emanating waves.Sound travels in all directions.....it's like waves emanating from a source.....there WILL be reflections from the back unless the speaker is somehow only unidirectional which is clearly not the case. A speaker vibrates MOST of its energy to the front but there will also be sound generated to the back and sides as well, which will inevitably cause reflections.
These reflections happen so quickly (at the speed sound) that it's VERY difficult to avoid them.....sound travels so quickly it covers huge distances in milliseconds.
There's no specific optimal value.have all the IRs in the III/FM3 been adjusted to this optimal value on a per-IR basis?
Stop the wind and kill the bugs. Just two of the things that make the outdoors a lousy place to record.How could one dampen as much noise as possible (wind, bugs, etc...
Nope.and is this a superior environment to say a warehouse?
"Anechoic" is only an approximation. All rooms have reflections, even anechoic ones.anechoic chamber?
I was just reading the Wiki"Anechoic" is only an approximation. All rooms have reflections, even anechoic ones.
Who would have thought of this!?I was just reading the Wiki
"Anechoic chambers are commonly used in acoustics to conduct experiments in nominally "free field" conditions, free-field meaning that there are no reflected signals."
They went on to say:
"In 2015, an anechoic chamber on the campus of Microsoft broke the world record with a measurement of −20.6 dBA."
So bill gates probably has the best place to do IRs
Lol
Who would have thought of this!?
@topic: very interesting. I will start to play around with IR lengths. Seems pretty reasonable to me. Thanks for sharing this information.
Apparently it can be quite disturbing.I bet those rooms sound stange, what with no reflections.
I was under the assumption the optimal value was a few samples before the first reflection.. is this not what Cliff has been saying?There's no specific optimal value.
For stock IR's, there's no easy way to determine where the first reflection is.I was under the assumption the optimal value was a few samples before the first reflection.. is this not what Cliff has been saying?
It looks like Cliff already hasFor stock IR's, there's no easy way to determine where the first reflection is.
For example, this is the plot of the "4x12 Brit 70s GB 313 A" IR:
View attachment 59676
IME that blip around 570 samples in or so is a reflection.
Plotting it using log magnitude is perhaps more illuminating:
View attachment 59677
You can see the energy decay and then pop up at around sample 570.
Time consuming to go through each one for sure, but I was curious as to what Cliff was going to do with his findings here. I doubt he'd share them and then not act on it..Here's another. This is an AC-15 cab:
View attachment 59681
Looks like a major reflection starting in the mid 300s!
The problem is, there's no easy way to get a stock IR into REW in order to analyze it.It looks like Cliff already has
Time consuming to go through each one for sure, but I was curious as to what Cliff was going to do with his findings here. I doubt he'd share them and then not act on it..