Sometimes we watch videos 2x faster when we want to save time on YouTube. We do this sometimes to study lessons faster, and sometimes to consume video content faster.
When we speed up the videos, the speaker’s voice accelerates along with the image, and the speaker’s voice sounds more high-pitched to us. What’s the connection between this speed boost and the treble?
First, let’s learn about sound waves.
Sound waves, in their simplest form, are waves that carry energy from one place to another in a medium. That is, these sound waves can propagate in liquids, solids and air.
Periodic waves are constantly oscillating. Sound waves are also classified as periodic waves. It is possible to explain the movement of sound waves with an example. For example, when someone speaking in a microphone starts to speak, it causes vibrations in the microphone and these vibrations affect the air molecules. In this way, sound waves propagate as a periodic wave in the air, allowing people to hear the sound.
An important property of sound waves is related to frequency.
The frequency of the sound is very important in order to produce a meaningful sound. Frequency also determines the pitch of the sound. How high a sound is is determined by its pitch. The higher the pitch of a sound, the higher the pitch. You can understand this issue better, girls have a higher pitch than boys and therefore their voices are sharper and higher-pitched.
Let’s listen to the first 11 seconds of Tarkan’s Kuzu Kuzu song as normal and the rest at x2 times:
When we speeded up the video by x2, we increased Tarkan’s pitch, so the sound felt more high-pitched to us.
In other words, during this acceleration, the vibrations caused by the sound move faster and the frequency of the sound wave increases. As the frequency increases, the pitch also increases, so the sound comes to our ears more high-pitched.
- Sources: University of Washington, TechTarget, University of Connecticut
- Image Source: Wikipedia
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