PEpeterbmarks·Aug 16, 2024
The codec2 project includes an HF OFDM that can be run from a command line. https://github.com/drowe67/codec2
In The history of orthogonal frequency-division multiplexing (2009)drowe67
codec2
C2019–2024
drowe67 / codec2
codec2
Open source speech codec designed for communications quality speech between 700 and 3200 bit/s. The main application is low bandwidth HF/VHF digital radio.
3Distinct people
4Mentions
0Explicit recommenders
471GitHub stars
What to know before exploring
What it is
Open source speech codec designed for communications quality speech between 700 and 3200 bit/s. The main application is low bandwidth HF/VHF digital radio.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
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Also in these discussions
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year4 dated mentions
Observed mentions: 2019-12-11 09:05:37 UTC to 2024-08-16 01:15:43 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 2 | 0 | 2 |
What Hacker News says
4 sourcesI'm currently working on a 2HD 3.5 inch floppy disk release of a podcast episode which has taken me down an interesting rabbit hole of low-bitrate audio codecs, floppy disk aesthetics and label design.
The episode I'm releasing is 1h40m long, which sounds like it couldn't possibly fit in 1.44MB, but there's an obscure but free codec mostly used by digital HAM radio enthusiasts called Codec2 [1] which can encode human voice in as low as 700bit/s (315KB/hr). At that quality setting it sounds like complete garbage, although still barely intelligible, and there are no readily available media players for it (there's not even an established file format) so I'm having to include complicated ffmpeg instructions in a README to get people to play it, but I think it all adds to the charm.
Funnily enough after searching for days for how to fit the or
Read the rest
iginal episode in a floppy (tried low-bitrate MP3, Opus and AAC, all of which fail at the task), and after discovering Codec2 almost by chance, I only then came across an article titled "Codec2: a whole Podcast on a Floppy Disk" [2] which I probably would've found if I had started by searching "podcast in a floppy".
1: https://github.com/drowe67/codec2
2: https://auphonic.com/blog/2018/06/01/codec2-podcast-on-flopp...
O nice, I wonder how 3 kbps speech compares to Google's Lyra.
https://github.com/google/lyra/releases
1.5 kbps speech is impressive, I wonder how it compares with Codec2 https://github.com/drowe67/codec2
or how all three compare to each other, useful for speech recordings, the only problem is that there is no widespread support yet.
In Using AI to compress audio files for quick and easy sharingLowest bitrate speech codecs have rates like 450bps, 700bps (Codec2) and 1600bps (LPCNet)
https://github.com/mozilla/LPCNet
https://github.com/drowe67/codec2
Conceivably one could reach 39 bps with near-realtime speech, tone, inflection and tempo recognition. Put the result into a zstd compressed SSML stream and perhaps even reach 16 bps.
https://stackoverflow.com/questions/46108940/is-there-a-way-...
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