FIELD: computer engineering; digital data recording systems. SUBSTANCE: method may be used in transmitting and receiving devices, computer-systems for data recording and processing, measurements, communications, digital audio and video apparatuses. Record signals of converted code group blocks are recorded in the form of sequence of marker half-cycle portions with reference values of length and amplitude extremes and data half-cycle portions. Length, amplitude extremes, and node offsets relative to half-cycle centers of data half-cycle portions are set depending on values of respective triads of code groups. Novelty is that different number of additional bits are adaptively connected to code-group triads where values of first code groups dictating length of half-cycle portions are other than zero. Additional nodes are shaped in half-cycle portions corresponding to additional triads. Amplitude and position of additional nodes depend on values of all code groups and bits of additional triads. EFFECT: enhanced density of digital data recording on record medium. 2 dwg, 1 tbl
