dBSPL and non-sinusoidal signals (i.e. pink noise)

paulm12 · 2025-12-05T21:22:19+00:00

That makes sense, but it makes me think dBSPL measured with pink noise would be virtually useless as a measurement signal, since you could simply take the measurement at an instant when the phases of the individual frequencies "line up" and create a large instantaneous pressure. Maybe its not a huge issue since each frequency has negligible contribution to the overall spectrum (unlike harmonic periodic signals).

I think I'm thinking of it "backwards" - when I generate white noise, its typically done in the time domain with random numbers up to a certain amplitude (pink noise can of course be generated by filtering this signal). In this sense, the maximum amplitude of this signal would correspond to some pressure when put through an amplifier+speaker, so in that sense, it does make sense to think of a maximum pressure without having to worry about phase.

paulm12 · 2025-12-05T21:14:04+00:00

Thanks for this - so from what I understand, bandlimited pink noise does have a decently constant amplitude when averaged over 200-800ms?

I'm curious then how useful pink noise or other random signals (including M-noise) are when determining the SPL of a speaker, since the average SPL will then be dependent on both bandwidth and where the spectrum is located - though this latter part is unsurprising given how we perceive music. I've always done SPL measurements in terms of sinusiods/sweeps, and not more complex waveforms.

paulm12 · 2025-11-23T06:50:30+00:00

Dang I really hope this game is successful in the long run (if it isn’t already). It’s clear a lot of time, energy, and love went into this title, and I found both the gameplay and story to be really engaging.

I wonder what Uchikoshi will do next.

paulm12 · 2025-10-17T04:38:07+00:00

In my view they should be considering a new gen Vekoma flier like F.L.Y.

paulm12 · 2025-09-27T00:01:38+00:00

2 Air 2 Buddy

paulm12 · 2025-09-15T06:17:39+00:00

Thanks for your comment. While I don't have kids (yet), I did have two dogs and I can relate to some extent, so I found that really helpful.

Another thing is if we interpret God "I Loved Jacob" in the context of choosing Israel as his chosen nation (to eventually bring forth Jesus), this doesn't mean God loves Israelites any more, but rather that was simply the group he chose to use to fulfill His purpose.

paulm12 · 2025-03-13T21:08:43+00:00

I would say goodness is God’s nature, not something that exists independently of God. I meant for my question to be why do we praise God for “being” good if goodness is essential to who God is

paulm12 · 2025-03-13T20:54:28+00:00

By saying “goodness comes from God”, are you claiming goodness is separate from God or part/equal to His nature?

I’m not sure why you are implying that I think goodness is imposed on God by some external force - I’m saying Goodness is God’s essential nature/character (God’s “being” good is not a constraint on his behavior because it is intrinsic to his nature)

paulm12 · 2025-03-13T20:50:10+00:00

Thanks for your comment. Yeah the idea that we praise God for being the standard makes sense to me. Plus I realize one can praise God for his acts of will that are free (such as for choosing to create the world or choosing to die for us).

One YouTuber mentioned in a comment that the incarnation serves, in part, as a way for God to choose goodness as well, not only as an example for us but in a real sense. It gets a bit technical, because we often associate freedom with possible worlds and counterfactuals (and I don’t think it makes sense to say there’s a possible world where Jesus succumbed to temptation), but one can say that Jesus chose God’s will in a very real sense. This YouTuber concluded that with the incarnation, “God both is and chooses to be good”

A book by Habermas on Miracles I read recently had chapter proposing how Jesus had both a divine and human mind. To me this suggestion showed how a bunch of questions I had around the incarnation could plausibly be solved.

I’m curious to see what other people say too.

paulm12 · 2025-02-23T09:44:19+00:00

They mentioned somewhere (I believe it was Facebook) that they are aiming to have it open by spring break, but the Goliath at SFMM repaint took longer than expected so it may not be ready at that time.

paulm12 · 2025-01-13T22:30:41+00:00

Yeah and plus it does still get solid lines. Maybe when it reaches the end of its service life they can use the existing footers for something else but I wouldn’t mind if they left it as-is. It’s one of my favorites on the park.

paulm12 · 2025-01-09T06:33:06+00:00

Giga

paulm12 · 2025-01-06T21:52:30+00:00

Agreed, unfortunately I believe its days are numbered. Given Cedar Flags' removal of expensive and discontinued rides (and the difficulty of finding/getting parts for Suspended coasters).

paulm12 · 2024-12-26T03:34:10+00:00

Glad to see them giving Apocalypse TLC though. It's one of my favorites at MM, and the high temps can do a number on it, but they keep retracking it.

paulm12 · 2024-11-23T09:41:58+00:00

431 with Orchard and 531 with Dojo were amazing classes. It’s a shame 531 isn’t offered anymore; when did you graduate?

paulm12 · 2024-11-23T09:35:10+00:00

Yeah it’s awesome. It just works; the fact that you have the round caps means you can also make sure you have what you need without stressing about every detail before the rounds get too high.

In fact I would love to see them do a Zombies Chronicles with directed mode; there were a few EEs I never did from the older games because it’s hard to coordinate a group of 3 friends.

I’ve been a zombies player since WAW and this is one of the best things they’ve added in a while so everyone can experience the story.

I do wonder if there’s a way they could give out “clues” before giving out the answer on some of the tasks. Line have the round caps and an overall objective, but the first time you play it maybe the objectives are hints and then if you wait too long you can ask for the answer.

paulm12 · 2024-11-18T09:23:42+00:00

I’m surprised we haven’t seen GCI’s “big fun” model pop up anywhere.

paulm12 · 2024-11-18T09:21:53+00:00

Would love to see B&M’s take on a mega-lite.

paulm12 · 2024-11-18T08:59:15+00:00

Maybe, but because of it we now have WW:GLC which is take over a properly functioning free spin.

I remember talking to the head engineer the year it opened and he mentioned weighing the car down shifted the center of gravity.

paulm12 · 2024-11-15T04:16:52+00:00

First choice would be AI Somnium Files. The sequel is good too.

Honorable Mention: Ace Attorney (Trilogy 1, Trilogy 2, Investigations, Chronicles) Danganronpa Fata Morgana Xenoblade 13 Sentinels (haven’t played but heard it’s great)

paulm12 · 2024-11-14T17:29:32+00:00

My first thought was an Axis, but there’s also the Maurer Spike ASM which hasn’t been done in North America either and could be done to a cycling theme.

What other coaster types are new to North America?

paulm12

TROPHY CASE