IPC Main Group
H04L 27/00 Modulated-carrier systems
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
6 direct subcodes
Child Classifications
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- H04L 27/01 Equalisers
- H04L 27/02 Amplitude-modulated carrier systems, e.g. using on/off keying; Single sideband or vestigial sideband modulation
- H04L 27/1 Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L 27/26 Systems using multi-frequency codes
- H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups , , , or