Carryl Baldwin, a professor of cognition and applied auditory research, designs and tests sounds for "use as alarms in household, aviation, medical, and automotive settings." Atlas Obscura explores the art and science of making sounds that convey a spectrum of urgency:
One of the main considerations is the annoyance factor. To test for annoyance in the lab, says Baldwin, “we’ll construct sounds and we’ll look at all of the different acoustic parameters, so we might vary, for instance, intensity, frequency, the number of harmonics, how fast it ramps up and down, the temporal characteristics—like whether it’s going d-d-d-d-d-duh rapidly or duhhhh-duhhhhh-duhhhh.”
The faster an alarm goes, the more urgent it tends to sound. And in terms of pitch, alarms start high. Most adults can hear sounds between 20 Hz and 20,000 Hz—Baldwin uses 1,000 Hz as a base frequency, which is at the bottom of the range of human speech. Above 20,000 Hz, she says, an alarm ”starts sounding not really urgent, but like a squeak.”
Harmonics are also important. To be perceived as urgent, an alarm needs to have two or more notes rather than being a pure tone, “otherwise it can sound almost angelic and soothing,” says Baldwin. “It needs to be more complex and kind of harsh.” An example of this harshness is the alarm sound that plays on TVs across the U.S. as part of the Emergency Alert System. The discordant noise is synonymous with impending doom.
Do you have kids? Here’s my advice – get these headphones by Puro Sound Labs. You won’t regret it. The number one reason to get them is for their volume-limiting ear protection. According to the National Institute on Deafness and Other Communication Disorders, “As many as 16 percent of teens (ages 12 to 19) have reported some hearing loss that could have been caused by loud noise.” And the Hearing Health Foundation says “…the problem is listening to MP3 players through earphones turned all the way up.” These headphones keep the volume below 85 dBA, the safety limit established by the CDC (Centers for Disease Control and Prevention).
The headphone cups and cushioning are designed to greatly reduce background noise so that your kids can listen to music and videos without having to turn up the volume to compete with traffic, airplane noise, and other sounds.
The ear safety features are reason enough to buy the headphones, but thier other features are also compelling. They have built-in Bluetooth, so no cord is needed (it comes with a cord in case you want to use the headphones with a non-Bluetooth media player). They will run for 18 hours on a single charge. They are also lightweight and made with attractive materials. They don’t look like a kid product - they are elegant and I like using them, too (though it’s a bit of a stretch to get them around my fat head). The sound quality is excellent, too. They are pre-tuned to sound their best on iOS (you can download an equalizer app to change the sound characteristics). Read the rest
This video explains the weirdness of the McGurk effect, a perceptual illusion demonstrating that understanding speech is not just about what we hear, but also what we see. You can learn more about the McGurk effect at Yale's Haskins Laboratories dedicated to the science of the spoken and written wordl. (via Imaginary Foundation) Read the rest
[Video Link] From H. Hoover at Distriction blog, a little anecdote about a cool interaction that Stephon, a young man who was "born deaf and justifiably proud," had with the president at a recent event:
Stephon stood just a few feet away from Barack Obama. The president, busy shaking hands, looked right at him. “It was like he was waiting for me to say something,” he said later.
So the 26-year-old Prince George’s Community College student took his cue and spoke to President Obama in his first language: American Sign Language. “I am proud of you,” Stephon signed. The president, almost involuntary, instinctively, immediately signed back.
“Thank you,” Obama replied.
The whole story is a nice little read.
This has nothing to do with the neat story behind this video, but I've always wondered: is being bald and steely-eyed a requirement for Secret Service agents? I mean, is it in the job description? And if they're not already bald, do they make them shave their heads? Because it seems like every one I've seen in real life, and in this video, is a steely-eyed bald guy. Someone please get back to me on that. Thanks.