For over 12 years, I’ve always thought that Cut the Hope sounds were in 44100Hz 128Kbps, but I’ve just noticed it today it is actually 22500hz with 80Kbps!
I know 22500Hz doesn’t use much data so the Kbps size on this case is great, but how can it sound that good, in terms of “quality”?
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Audio compression is more or less effective depending on the actual audio. Audio codecs work differently but it’s common to break down the audio into different frequencies, and either remove the quietest ones or change the possible values to be less precise but have a wider range (you could use 4 bits to represent the values 1-16, or use 2 bits to represent the values 2, 4, 8, or 16). If an audio source has either fewer active frequencies or the amplitudes match up with the new values (depending on your choice of codec), it will not lose as much quality for the same bitrate.
You can see this in video while watching sports. Video compression is based on comparing frames to previous ones, and only tracking the changes. TV has a relatively constant bitrate, so fast moving videos with large changes between frames like sports get jpeg like compression artifacts.
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