Codec2: A Whole Podcast on a Floppy Disk

Post by raphlinus » Sat, Jun 23, 2018, 11:37 PM UTC

misnome wrote: post #39

raphlinus wrote: post #24

Earlier quoted context omitted.

It's the lossy jbig2 compression in Xerox copiers: http://www.dkriesel.com/en/blog/2013/0802_xerox-workcentres_... And yes, I think this is a relevant comparison. As the entropy model becomes more sophisticated, errors are more likely to be plausible texts with different meaning, and less likely to be degraded in ways that human processing can intuitively detect and compensate for.

> t's the lossy jbig2 compression in Xerox copiers: http://www.dkriesel.com/en/blog/2013/0802_xerox-workcentres_... . My understanding of this fault was that it was a bug in their implementation of JBIG2, not the actual compression? Linked article seems to support this.

Post by voxadam » Sat, Jun 23, 2018, 11:42 PM UTC

sp332 wrote: post #40

MrRadar wrote: post #21

Codec2 is also fully open source and patent-free, in contrast to virtually every other ultra-low-bitrate voice codec (which are proprietary and have expensive patent licensing attached). He has a Patreon if you want to support him in the ongoing development of Codec2 and his SDR modems to enable use of it in amateur radio: https://www.patreon.com/drowe67

Is Speex also in that category?

Post by S3raph » Sat, Jun 23, 2018, 11:51 PM UTC

jimnotgym wrote: post #11

mockery wrote: post #2

None of the audio samples play for me (In neither Chrome nor Edge... Other sites play just fine.) Makes it very hard to evaluate claims of codec quality, which seems like the primary purpose of the blog post. :(

Working on Firefox Android

Post by bmdavi3 » Sun, Jun 24, 2018, 12:08 AM UTC

jancsika wrote: post #44

Would be a fun experiment to use something like 3 or even 1 sine to get unintelligible speech, but then pair it with subtitles where each syllable of the text is animated synchronized with the speech. (Like the "follow the bouncing ball" song lyric animations.) By pairing the audio with the text, you would almost certainly convince the listener that they can understand it. Edit: typo

Post by gruturo » Sun, Jun 24, 2018, 12:18 AM UTC

bmdavi3 wrote: post #47

jancsika wrote: post #44

Would be a fun experiment to use something like 3 or even 1 sine to get unintelligible speech, but then pair it with subtitles where each syllable of the text is animated synchronized with the speech. (Like the "follow the bouncing ball" song lyric animations.) By pairing the audio with the text, you would almost certainly convince the listener that they can understand it. Edit: typo

Or what if you scrunched the audio down to a bandwidth beyond what was still intelligible, but still captured some semblance of the speaker's voice. Use the original audio to compute subtitles and store them alongside the audio. That's your file. Then the player uses both as inputs to ai (some hand waving), which now has enough to put the pieces together and produce something intelligible again, in the speaker's voic…