HF Digital Voice modes comparison

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Test of WinDRM with LPC 10 and SPEEX codecs, FDMDV version 1.3 and narrow 1.1Khz bandwidth versions. Since this video, a newer digital voice mode called FreeDV has come out. If you're interested in DV, I highly recommend trying that mode, as it works better than any of the modes in this video as lower SNRs. Help make my videos better: https://www.patreon.com/radiosification