Notices by Don Romano (alt) (thor@noagendasocial.com), page 42

It's possible to make architecture look new without also making it look ugly, but no one seems to want that for some messed up reason.

I have a sneaking suspicion that we only get this hideous architecture and public art because the people who commission it don't actually have any sense of aesthetics and are just pretending to be "in the know" because rejecting postmodernity and demanding beauty instead would brand you as unsophisticated and reactionary.

I hadn't even considered that anyone might *not* want the tower of Notre Dame to look like it did before.

One French architect said that rebuilding it to look exactly like the old one would be grotesque.

If they let architects loose on it instead of historians and artisans, they're going to ruin it with their wretched postmodernism.

@vilbi But, Norway kind of is like this at times. Sometimes, the streets are just empty because almost no one is out. Norwegians are very habitual.

@vilbi Not many people are traveling today. Friday before Palm Sunday, the day before Maundy Thursday and Easter Monday are the big ones... which, since I was late to book, is why I wasn't able to find flights on those dates.

I need to come up with less of a mouthful than "Cardoid MEMS Microphone Array" for this project. If you expand MEMS, it's even longer: "Cardoid Microelectromechanical System Microphone Array".

Almost home. Waiting for the airport express train to Lysaker, and then I'm a short bus ride away from my house.

Getting ready to take off from Tromsø. This plane is a lot more crowded. I wish my Bose headphones could filter out the sound of children crying. That would be a blessing.

The Storebrand (major insurance and pension fund management company in Norway) has a sponsored article on VG (major Norwegian news site) about global warming. Their schpiel is that they can get better ROI on your money by investing in an eco-friendly way.

Anthropogenic global warming isn't a controversial theory in Norway (or Europe) at all, or they wouldn't run an ad like that, since they'd risk alienating potential customers.

Note: The physical size of this microphone array would only be about 9x9mm (⅓x⅓"), with a pitch of 7.15mm between each element. It doesn't need to be any bigger than that, and due to frequency tuning, it shouldn't be any bigger either.

#CardioidMEMSMicrophoneArray

With only 2 elements in the microphone array, i was getting a polar plot resembling a figure-eight pattern sideways close to 20 kHz. I didn't like that, so I tried an experiment where I doubled the array to 4 microphones, arranged in a square. This improved the pattern — it now has a, uh, dentoid (tooth-like) pattern close to 20 kHz, and the sideways Bode plot is very interesting — it cuts the high end by 6 dB.

#CardioidMEMSMicrophoneArray

With only 2 elements in the microphone array, i was getting a polar plot resembling a figure-eight pattern sideways close to 20 kHz. I didn't like that, so I tried an experiment where I doubled the array to 4 microphones, arranged in a square. This improved the pattern — it now has a, uh, dentoid (tooth-like) pattern close to 20 kHz, and the sideways Bode plot is very interesting — it cuts the high end by 6 dB. I think that's going to improve the perceived directivity.

Landed in Tromsø.

My flight to Oslo doesn't take off for another 2¼ hours, so I'll be sitting here with my laptop in the airport cafe.

Just boarded the plane to Tromsø. I have a 2-hour layover there before boarding the plane to Oslo.

I have collected everything I have written about the cardioid MEMS microphone array in one blog post:

https://polymorph.no/cardioid-mems-microphone-array/

More to follow.

#CardioidMEMSMicrophoneArray

I have collected everything I have written about the cardioid MEMS microphone array in one blog post:

https://polymorph.no/cardioid-mems-microphone-array/

More to follow.

You can't actually see the center frequency of the Helmholtz resonator in most MEMS microphone datasheets, but if you look at the datasheet for an ultrasonic one, you can see it. The approximate parameters look to be:

f = 25kHz
g = 15dB
Q = f / 8 kHz = 3.125

It seems to vary a lot, but it wouldn't surprise me If 25 kHz is what they generally aim at as a compromise. Bigger diaphragm and displacement means better sensitivity and max SPL but also larger cavity and thus lower Helmholtz resonance.

Example frequency response of a MEMS microphonen — from the ST Microelectronics Tutorial for MEMS Microphones.

The Helmholtz resonance of a MEMS microphone looks inconvenient at first glance, but in the microphone array design I'm working on, I'm using two MEMS capsules to create a cardioid pattern, and if you space them apart just right, and induce a phase delay equal to the wave propagation time between them, the first notch in the resulting comb filter will flatten the peak.

TL;DR: Mastodon is severely broken in many ways.