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