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Everything You Need To Know About Digital Audio Signals

hamsteralliance says...

tl;dr: No, not really and no, probably not.

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MP3 compression methods are pretty good these days. A well encoded mp3 sounds quite good at 224k. 320k is ideal, but 224k sounds fine to me.

I think most people would be incredibly hard pressed to tell the difference between a well encoded 320k MP3 and a FLAC file.

To showcase this and hopefully answer your question through demonstration, I've put together an odd sound file here for ya: http://dl.dropboxusercontent.com/u/837649/soundtest.wav

It's a 24bit 48kHz wav file of a piece of bright and full audio thrown together just for this (using 24-bit 48kHz audio sources). The audio loops a few times and each time it loops it's in a different format or quality.

The odd part is that I've dropped the audio volume down all the way to just barely above the 16-bit noise floor before exporting into each format, then cranked the volume back up again. Just to see what would happen.

Anyway, the play order is as follows:
1. Original 16-bit audio (sound normal, as it should.)
2. 16-bit audio re-gained (noise city - the 16-bit FLAC was the same.)
3. 24-bit audio re-gained (Sounds as good as the original.)
4. FLAC 24-bit re-gained (Sounds as good as the original.)
5. MP3 8 k re-gained (What?)
6. MP3 64 k re-gained (Sounds like a bad MP3, because it is. but, do note it's mostly just dull and a bit unstable sounding, not all weird like the 8k one.)
7. MP3 128 k re-gained (Pretty good, but still a bit dull. Not horrible though.)
8. MP3 224 k re-gained (Sounds as good as the original? Pretty close, I'd say.)
9. MP3 320 k re-gained (Sounds as good as the original as far as I'm concerned.)

This is just one test though. There are most certainly songs or sounds out there that wouldn't fare as well as this one. No idea what those would be though, as everything I've MP3-ified in the last decade or so sounds absolutely fine to me.

MilkmanDan said:

Thanks for the reply and sharing your expertise -- sounds like you'd confirm everything that the video said.

This probably just displays my ignorance more, but specifically with regards to the MP3 format, do you think it adds any noticeable compression artifacts even at high-quality settings? Part of my problem was that I was thinking of MP3 *bit*rate as sampling rate (128 kbit/s = 128 kHz, which is not at all correct). But still, MP3 is a lossy format (obviously since one can turn a 650M CD into ~60M of 128k MP3s, or still a large filesize savings even for 320k) and even my relatively untrained ear can sometimes hear the difference at low (say, 128k or lower) bitrates.

I guess that a music producer wouldn't record/master anything in a compressed format like MP3, so that is sort of entirely separate from the point of this video and your comment. But just out of curiosity, do you think that people can detect differences between a 16 bit 44 kHz uncompressed digital recording (flac maybe?) and a very high quality MP3 (say, 320 kbit)?

Eddie Huang exposes TED Conference

legacy0100 says...

The comments about his race was a joke ponce.

Anyways this is a side of TED that I was not aware of. Very nice find. *promote

ps. for the record I'm Asian and I'm terrible at math. I didn't know the answer to that 2k x 8k question. I knew it was somewhere 16 but didn't know how many millions it was.

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