764 karma · joined November 23, 2011
# hnchat:fC2neOsfEuewWNgLieMJ
And even then, the "pause" function on the majority of domestic VCRs would invariably obscure the interesting parts of the frame with "noise bars".
For many years now we've had various interfaces that use physical buttons whose function can change at different times during operation, the current function being indicated by the screen: Old fashioned ATMs with 4 buttons on each side of the screen, many business-class feature-phones had "soft-keys", even old DOS programs that used Function Keys are conceptually similar.
There are differing degrees of compromise vs utility.
You might find most standards for ~20 USD, but ISO8601 direct from iso.org will set you back 173 CHF (~200 USD) for part 1¹, 194 CHF (~220 USD) for part 2². For $20 you get only the latest amendments from them.
Meanwhile the Estonians will gladly sell you their version of part 1 for just under 30 USD.³
¹: https://www.iso.org/standard/70907.html
Lossy codecs use psycho-acoustic models with are designed to save space by discarding data that's unlikely to be missed by humans. - Often frequencies that would be masked by other sounds.
This process often results in what looks like 'holes' in the spectrogram, if compared to a lossless 'smooth' version.
Most people then (wrongly) assume that he file then sounds bad, when actually the bits saved there may well have been used to better encode part of the spectrum that human ears would notice.
It's quite possible to generate a great looking spectrogram that yields a poor sounding file and vice-versa.
Lossy encodes *always* cause some further degradation of audio-quality with each encode so it's best to leave lossy files as is, and always choose the least processed version. (e.g the 128kbps AAC (.m4a) from youtube will always be better than any MP3 version of the same source).
Audacity, SoX , & FFmpeg are also capable of producing more accurate spectrograms than Spek (with a steeper learning curve of course).
Much more informations on this and related topics at Hydrogen Audio[0]
I know airline systems have a lot of legacy code so it might be difficult, but at least logistically (having adequate space to print / display them), and for humans to deal with it's not too difficult.
Manage your own sync between devices with syncthing, dropbox or whatever you prefer.
Much cleaner.
[0](https://github.com/psanford/wormhole-william)
[1](https://f-droid.org/en/packages/com.pavelsof.wormhole/)
[2](https://f-droid.org/en/packages/com.leastauthority.destiny/)
Do likewise at the bottom edge, adding a seal to the floor / carpet. Don't be frugal (these are drunk roadies in full prank mode)... use your imagination ;)
* other brands of very sticky strong tape are available.