DIFF Subgroup
H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels
Introduced: July 1974
Full Title
Baseband systems > Synchronous or start-stop systems, e.g. for Baudot code > Transmitting circuits; Receiving circuits > using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels
CPC subdivides this area 3x more granularly than IPC with 4 additional codes.
4 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- H04L 25/493 by transition coding, i.e. the time-position or direction of a transition being encoded before transmission since 1980 IPC+CPC Available in IPC and CPC
- H04L 25/497 by correlative coding, e.g. partial response coding or echo modulation coding since 1980 +1 CPC IPC+CPC Available in IPC and CPC