codec2 was developed to support the FreeDV project fo low bitrate digital voice over High Frequency radio frequencies (Ham radio). Unlike LPC-10, it has clear licensing and superior performace.
http://www.rowetel.com/blog/?page_id=452
https://codeberg.org/sox_ng/sox_ng/issues/705
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https://codeberg.org/sox_ng/sox_ng/issues/705