Re:Norway switches off FM radio, but a station is defying go...
by userbinator on Friday December 15, 2017 @11:53PM
(#15937780)
I think you're referring to progressive (regular) JPEG, which is not wavelet-based but just incremental DCT. JPEG2000 is wavelet-based, requires many times more processing power, and is hardly encountered on the Internet due to nearly nonexistent browser support(see https://caniuse.com/jpeg2000 ).
Why the digital FM standard doesn't do that, I'm at a loss.
The form of progressiveness in JPEG and other file formats is conceptually quite simple --- you send the "rough draft" first, then incrementally improve quality by sending more bytes. "Degradation" is basically limited to truncating the stream.
Broadcast radio reception degrades in a very different way --- (unpredictable) parts of the signal vary in strength or actually become corrupted. Either the decoder can decode the bits correctly or it can't, and which parts get weakened or corrupted is not easily predictable.
Why the digital FM standard doesn't do that, I'm at a loss.
There are definitely progressive codecs. Hell, look at JPEG (which uses Wavelets). Older kids will remember waiting for JPEG's of naked ladies to get "clearer and clearer" as the interlaced mode progressively builds the picture.
p.s. Wavelets are a super fun Google/Wiki to read up on over a night.
[edit] IT SHOULD BE NOTED, not all countries may have adapted the same codec so this "popping out" issue may only affect certain countries.