H04B - Definition fr

Definition statement

This subclass covers:

The transmission of information carrying signals, the transmission being independent of the nature of the information. Monitoring and testing arrangements and the suppression and limitation of noise and interference.

The user is referred to the IPC definitions of individual main groups of subclass H04B:

Transmission systems characterised by the waveband used for transmission:

Radio waves - see definition for main group H04B 7/00.

Light, infrared waves or corpuscular radiation - see definition for main group H04B 10/00.

Ultrasonic, sonic or infrasonic waves - see definition for main group H04B 11/00.

Transmission systems characterised by the medium used for transmission:

Conductors - see definition for main group H04B 3/00.

Free-space propagation - see definition for main groups H04B 5/00, H04B 7/00, H04B 10/00, H04B 11/00.

Earth or water - see definition for main group H04B 13/00.

Transmission systems characterised by the carrier modulation used for transmission:

Pulse modulation - see definition for main group H04B 14/00.

Relationship between large subject matter areas

If the transmission systems are specially adapted for particular applications classification is also made in subclasses listed in section "Informative references".

Informative references

Attention is drawn to the following places, which may be of interest for search:

Transmission systems for measured values, control or similar signals

G08C

Speech analysis or synthesis

G10L

Coding, decoding or code conversion

H03M

Broadcast communication

H04H

Multiplex communication

H04J

Secret communication

H04K

Transmission of digital information

H04L

Telephonic communication

H04M

Pictorial communication

H04N

Paging systems using radio links (Selecting)

H04Q

Special rules of classification

Transmission systems characterised by the medium used for transmission or by band of employing waves should be classified in groups H04B 3/00, H04B 5/00, H04B 7/00, H04B 10/00, H04B 11/00 or in residual group H04B 13/00.

Transmission systems characterised by the use of carrier modulation or sub-carrier should be classified in group H04B 14/00 and details thereof in group H04B 1/00.