Search found 68 matches

by bjkwon
June 14th, 2020, 6:19 pm
Forum: Hearing health
Topic: 37. My ear hurts. Am I going deaf?
Replies: 0
Views: 837

37. My ear hurts. Am I going deaf?

Probably not. Most people with cochlear hearing loss don't experience any pain while losing hearing--there are no pain receptors in the cochlea! There are a lot of pain nerves inside the ear canal, though, naturally stopping you from poking a Q-tip deep down there. You shouldn't stick one in your e...
by bjkwon
June 14th, 2020, 6:17 pm
Forum: Hearing
Topic: 36. Following an object moving up/down
Replies: 0
Views: 1181

36. Following an object moving up/down

Following the location of sound moving up/down at the center line is not as straightforward as something moving left/right. There are no differences between ears in the intensity and the arrival time. How do we then locate the sound moving up/down? It takes an acquired, rather than innate, skill. T...
by bjkwon
June 14th, 2020, 6:15 pm
Forum: Hearing
Topic: 34. Why is static noise sometimes soothing?
Replies: 0
Views: 903

34. Why is static noise sometimes soothing?

Sometimes we don't want to react to sound, but we can't help it. The sound from upstairs you hear every so often drives you crazy. Every time a cubicle neighbor munching his snack, you wish your hearing was not this good. The problem is, whenever we hear a sound, we are programmed to process it out...
by bjkwon
June 14th, 2020, 6:13 pm
Forum: Hearing
Topic: 31. Then what happens when you mix 100 Hz and 150 Hz?
Replies: 0
Views: 884

31. Then what happens when you mix 100 Hz and 150 Hz?

Applying the same rule {from episode 30 http://auxlab.org/forum/posting.php?mode=post&f=15 } , we have a 125-Hz tone pulsating 50 times a second. However, though mathematically correct, that description doesn't represent how we feel it; i.e., this doesn't sound a 125-Hz pure tone at all. To math-lo...
by bjkwon
June 14th, 2020, 6:12 pm
Forum: Hearing
Topic: 31. Then what happens when you mix 100 Hz and 150 Hz?
Replies: 0
Views: 959

31. Then what happens when you mix 100 Hz and 150 Hz?

Applying the same rule {from episode 30 http://auxlab.org/forum/posting.php?mode=post&f=15 } , we have a 125-Hz tone pulsating 50 times a second. However, though mathematically correct, that description doesn't represent how we feel it; i.e., this doesn't sound a 125-Hz pure tone at all. To math-lo...
by bjkwon
June 14th, 2020, 6:07 pm
Forum: Hearing
Topic: 30. If you mix two pure tones with frequencies of 100 Hz and 102 Hz
Replies: 0
Views: 904

30. If you mix two pure tones with frequencies of 100 Hz and 102 Hz

You will have a tone of 101 Hz, the average of the two frequencies, with its amplitude oscillating at the rate of 2 Hz, the frequency difference. This makes perfect sense: following the Product-Sum Identity of sine and cosine{ref}, the right hand side of the equation is the product of the two terms...
by bjkwon
June 14th, 2020, 5:06 pm
Forum: Hearing
Topic: 25. Peripheral hearing
Replies: 0
Views: 918

25. Peripheral hearing

Peripheral vision is critical to spatial awareness. While you stare at an object, your brain unconsciously scans your surroundings and prepares you to react to them as needed. Vision problems interfere with our ability to cope with complex, dynamic environment. Hearing loss also can have negative i...
by bjkwon
June 14th, 2020, 4:58 pm
Forum: Hearing
Topic: 22. How do we hear sounds?
Replies: 0
Views: 895

22. How do we hear sounds?

An air wave enters the ear canal and hits the eardrum, behind which the ossicles relay the vibration to the cochlea. The cochlea is a fluid-filled duct with the length of 30 millimeters, coiled like a snail, has tens of thousands of "hair cells" in it. Following the vibration, hair cells sway back ...
by bjkwon
June 14th, 2020, 4:40 pm
Forum: Fundamentals
Topic: 6. Breaking a wine glass with her voice
Replies: 0
Views: 1252

6. Breaking a wine glass with her voice

You might have heard a story of a strong, high-pitched soprano voice breaking a wine glass. How is it possible? Does a human voice have enough power to destroy an object? No. Not even close--we need 100 or 1000 times greater energy than that in a human voice. The key is the resonance. It is not the...
by bjkwon
June 14th, 2020, 4:36 pm
Forum: Fundamentals
Topic: 10. Attributes of sound
Replies: 0
Views: 902

10. Attributes of sound

The loudness or volume (loud, intense vs soft, quiet) and the pitch (high vs low) are the two pivotal attributes of sounds in perception. They are directly related to physical attributes; intensity and frequency, respectively. A third attribute, timbre, encompasses any quality of sound not covered ...