CPC Subgroup
H04L 27/26 Systems using multi-frequency codes (H04L27/32 takes precedence)
Full Title
Modulated-carrier systems > Systems using multi-frequency codes (H04L27/32 takes precedence)
3 direct subcodes
Child Classifications
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- H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
- H04L 27/30 wherein each code element is represented by a combination of frequencies