IPC Subgroup
H04L 27/26 Systems using multi-frequency codes
Introduced: September 1968
Last revised: January 2006
Full Title
Modulated-carrier systems > Systems using multi-frequency codes
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
2 direct subcodes
Child Classifications
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- H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
- H04L 27/3 wherein each code element is represented by a combination of frequencies