4 ms·
Yep, this is how both MP3 (and Ogg-Vorbis) and JPEG all work. Picking the weights for which frequencies to keep is, presumably, chosen based on some psychoacous
by abetusk 2y ago
Yep, this is how both MP3 (and Ogg-Vorbis) and JPEG all work. Picking the weights for which frequencies to keep is, presumably, chosen based on some psychoacoustic model but the coarse description is literally throwing away high order frequency information.
- dylan604 2y ago> chosen based on some psychoacoustic model Does audio encoding use a similar method of using matrices to pick which frequencies get thrown away? Some video encoders allow you to change the matrices so you can tweak them based on content.
- astrange 2y agoAudio is one dimensional, so it doesn't use matrices but just arrays (called subbands). And you can't get too hard into psychoacoustic coding, because people will play compressed audio through all kinds of speakers or EQs that will unhide everything you tried to hide with the psychoacoustics. But yes, it's similar. (IIRC, the #1 mp3 encoder LAME was mostly tuned by listening to it on laptop speakers.)
- dylan604 2y agoI know one mix studio that has a large selection of monitors to listen to a mix through ranging from the highest of high end studio monitors, mid-level monitors, home bookshelf speakers, and even a collection of headphones and earbuds. So when you say "check it on whatever you have available", you have to be a bit more specific with this guy's setup