JP
Upload

This video is unavailable.

Codec 2 - Open Source Speech Coding at 2400 bit/s and Below - David Rowe

linuxconfau2012 linuxconfau2012·119 videos
1,165

Subscription preferences

Loading...

Loading icon Loading...

Working...
4,314
Like     Dislike 0

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to like linuxconfau2012's video.

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to dislike linuxconfau2012's video.

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to add linuxconfau2012's video to your playlist.

Uploaded on Jan 19, 2012

Codec2 is an open source low bit rate speech codec designed for communications quality speech at around 2400 bit/s. Applications include low bandwidth HF/VHF digital radio and VOIP trunking. Codec 2 operating at 2000 bit/s can send 32 phone calls using the bandwidth required for one 64 kbit/s uncompressed phone call. It fills a gap in open source, free-as-in-speech voice codecs beneath 5000 bit/s and is released under the GNU Lesser General Public License (LGPL).

Loading icon Loading...

Loading icon Loading...

Loading icon Loading...

The interactive transcript could not be loaded.

Loading icon Loading...

Loading icon Loading...

Ratings have been disabled for this video.
Rating is available when the video has been rented.
This feature is not available right now. Please try again later.

All Comments (7)

Sign in now to post a comment!
  • Mike Trieu

    Awesome development! These are heady times for open source and I feel so fortunate to be alive in it. It's a shame the video got truncated so early, but I feel I got the gist out of it, regardless =)

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Mike Trieu's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Mike Trieu's comment.
  • overand

    Love it. Really hope the codec2 site improves a bit - I'll be *very* happy if this gains traction.

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate overand's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate overand's comment.
  • Sterling Coffey

    This is pretty bloody awesome. I don't watch many videos over 7 minutes. I can't wait to get this on the ham bands...I moreover can't wait to learn how to program.

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Sterling Coffey's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Sterling Coffey's comment.
  • Bruce Perens

    Follow our progress at Codec2.org

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Bruce Perens's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Bruce Perens's comment.
  • Bruce Perens

    8100 Hz, not KHz.

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Bruce Perens's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Bruce Perens's comment.
    in reply to Bruce Perens (Show the comment)
  • Bruce Perens

    8 KHz is more than twice the telephone-quality speech band that is actually encoded, so we're sure we're getting all of the sound. It turns out that in practice we generally do convert up to 48 KHz, but only because many PC sound cards and AC97-derived embedded sound chips work correctly at 48 KHz and don't work correctly at other clock rates. We found one that clocked at 8100 KHz when we told it 8 KHz, etc.

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Bruce Perens's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate Bruce Perens's comment.
    in reply to TimmmmCam (Show the comment)
  • TimmmmCam

    Good work. Why is it 8 kHz when it is model based though? You could use 48 kHz with no cost right (apart from maybe processing cost)?

    ·

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate TimmmmCam's comment.

    Sign in to YouTube

    Sign in with your YouTube Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to rate TimmmmCam's comment.
  • Loading comment...
Loading...
Loading...
Working...
Sign in to add this to Watch Later