> 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.
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