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Ask HN: How was this 30 mil views video generated?

7 points by dartdartdart ↗ HN
video of an ever increasing frequency of sound with said sound: https://www.youtube.com/watch?v=H-iCZElJ8m0

The creator has 30 million combined views for this type of video, which is their only type of video. No other video on youtube seems to do anything similar. I'm most interested in how they generated the sine wave to be played. Does anyone know how they achieved it?

7 comments

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tomcam
For me in the USA it says 10 million. This could have been done using any popular API: Windows, MacOS, iOS, Android, etc. You could do it in a short time with the Juce library. (juce.com)
muzani
I thought it would have been filtered out by the video compression. I studied telecommunications and what I understand is non-voice content over phone is filtered out, and some compression types like MP3 will remove information from certain frequencies.
non-entity
I'm guessing something like Audacity?
gus_massa
You can do something similar in Wolfram Alpha

https://www.wolframalpha.com/input/?i=play+a+sin%282*pi*t*%2...

This plays a sound for 10 seconds. It start with a A (440Hz) and it goes to the next A (880Hz). The "frequency" changes linearly in my example, but you may prefer to change it exponential (like when you move the finger over a piano).

https://www.wolframalpha.com/input/?i=play+a+sin%282*pi*t*44...

This can be made with a lot of programs, I only choose Wolfram Alpha because it was easy to post an online demo.

natdempk
Not entirely sure if you're talking about the sound or the image to go along with it, but at least for the sound I think you could create this easily in any sort of DAW with a synth (all of which will include a basic sine wave) + automation to increase the pitch input over time gradually.

I'm not entirely sure about the video component.