pitch
If you push or tap the buttons on below, it will make a sound. If you push or tap the button again, the sound will be stopped. Try each buttons, and listen the pitch of both sound.
Let's turn on both the first button and second button, and listen the pitch of the sound with care.
You might hear different pitch sound, don't you? The sound might be a low sound that same as the sound of this .
In general, it is explained that the pitch of the sound is the frequency of the sound. But, as you have heard, many people experience a different pitch when making two simple sounds like a tuning fork. The each frequency is 440 Hz and 490 Hz.The frequency of the low sound will be 50 Hz.
Let me write a little bit more detail, it is explained that sounds such as instruments can be split down into many simple sounds called harmonics. And, the frequency of the fundamental tone, which is a part of harmonics, is the pitch of the sound. However, it seems that the human is feeling the pitch of the sound by the frequency that subtract of the frequencies of the harmonics next to each other. In this example, the sounds of 440 Hz and 490 Hz are adjacent harmonics, and the difference in frequency of 50 Hz is the pitch of the sound the human feels.
For example, it appears to be possible to explain why you can hear the low sound like low keys of a piano and a bass guitar even in a small AM radio.
Of course, as you can see on the previous page, the pitch of the sound the human feels cannot be decided by just one. However, the difference of harmonic frequencies seems to take an important part of the sense of human, I think.
Please try more, if you want. Change the frequency difference of the sound by yourself with the buttons below. [440 Hz Sound] button is the reference sound. [ + ] button and [ - ] button can change the frequency of the sound that comes with [Diff. Sound] button. Please compare the pitch of the sounds of each button and the pitch of the sound that you turn on both sound at the same time。Also, please compare with the pitch of the sound of [Ref. Sound] button.
490
50