To or from biphase level coding, i.e. to or from codes where

Official title: {to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code}

G11B20/1419 (To or from biphase level coding, i.e. to or from codes where) appears on 244 US grants and 43 published applications in this corpus.