DIFF Subgroup
H04L 27/26 Systems using multi-frequency codes (H04L27/32 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Systems using multi-frequency codes
CPC: Systems using multi-frequency codes (H04L27/32 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Modulated-carrier systems > Systems using multi-frequency codes
CPC:
Modulated-carrier systems > Systems using multi-frequency codes (H04L27/32 takes precedence)
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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- H04L 27/28 with simultaneous transmission of different frequencies each representing one code element IPC+CPC Available in IPC and CPC
- H04L 27/30 wherein each code element is represented by a combination of frequencies IPC+CPC Available in IPC and CPC