Good work Adrian... I have heard that people have used codec2 to go to 450 bits/sec too... That's the reason I praisa David Rowe alot... His open source work has been a gift for many researchers to play their role in innovations..
On Tue, Sep 10, 2019 at 4:56 PM Adrian Musceac <[email protected]> wrote: > > Hi David, >> I think I can slightly improve the quality of playback of Codec2 samples >> with some rather computationally cheap methods. This might be of use to you >> for FreeDV. >> Please have a listen at the sample attached, which is Codec2 at 1400 >> bits/s. >> Link included in case the attachment doesn't go through: >> http://qradiolink.org/images/codec2_1400.wav >> The trick is a little filtering, emphasis and a little audio compression >> applied. >> I have some pathological Codec2 samples recorded with my voice that are >> really improved with this method. If you want I can send them to you. >> Noisy samples have a little problem with the compressor driving too early >> and bringing out the noise, so I think I can still do some adjusting there. >> Codec2 700B is different though, I have to adjust the filters and >> emphasis because I get some aliasing of higher frequencies. >> >> Adrian >> > > It seems my previous message got stuck because of the attachment, so I'm > including just the link to the Codec2 sample. > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >
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