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IPC 7
  H04 - H04B 5/06  
H04B00700-H04B01702
 

SECTION H – ELECTRICITY


H 04ELECTRIC COMMUNICATION TECHNIQUE


H 04 BTRANSMISSION (transmission systems for measured values, control or similar signals G08C; speech analysis or synthesis G10L; coding, decoding or code conversion, in general H03M; broadcast communication H04H; multiplex systems H04J; secret communication H04K; transmission of digital information H04L) [4]


7/

00Radio transmission systems, i.e. using radiation field (H04B 10/00, H04B 15/00 take precedence)

7/

005.Control of transmission; Equalising  [3]

7/

01.Reducing phase shift  [3]

7/

015.Reducing echo effects  [3]

7/

02.Diversity systems (for direction finding G01S 3/72; aerial arrays or systems H01Q)

7/

04..using a plurality of spaced independent aerials

7/

06...at transmitting station

7/

08...at receiving station

7/

10..using a single aerial system characterised by its polarisation or directive properties, e.g. polarisation diversity, direction diversity

7/

12..Frequency-diversity systems

7/

14.Relay systems (interrogator-responder radar systems G01S 13/74)  [2]

7/

145..Passive relay systems  [2]

7/

15..Active relay systems  [2]

7/

155...Ground-based stations (H04B 7/204 takes precedence)  [2,5]

7/

165....employing angle modulation  [2]

7/

17....employing pulse modulation, e.g. pulse code modulation  [2]

7/

185...Space-based or airborne stations (H04B 7/204 takes precedence)  [2,5]

7/

19....Earth-synchronous stations  [2]

7/

195....Non-synchronous stations  [2]

7/

204...Multiple access  [5]

7/

208....Frequency-division multiple access  [5]

7/

212....Time-division multiple access  [5]

7/

216....Code-division or spread-spectrum multiple access (spread spectrum techniques in general H04B 1/69)  [5]

7/

22.Scatter propagation systems

7/

24.for communication between two or more posts (for selecting H04Q 7/00)  [2]

7/

26..at least one of which is mobile  [2]


10/

00Transmission systems employing beams of corpuscular radiation, or electromagnetic waves other than radio waves, e.g. light, infra-red (optical coupling, mixing or splitting G02B; light guides G02B 6/00; switching, modulation, demodulation of light beams G02B, G02F; devices or arrangements for the control, e.g. modulation, of light beams G02F 1/00; devices or arrangements for demodulating light, transferring the modulation or changing the frequency of light G02F 2/00; optical multiplex systems H04J 14/00) [5]

10/

02.Details  [5]

10/

04..Transmitters  [5]

10/

06..Receivers  [5]

10/

08..Equipment for monitoring, testing or fault measuring  [5]

10/

10.Transmission through free space, e.g. through the atmosphere (H04B 10/22, H04B 10/24, H04B 10/30 take precedence) [5,7]

10/

105..specially adapted for satellite links  [6]

10/

12.Transmission through light guides, e.g. optical fibres (H04B 10/22, H04B 10/24, H04B 10/30 take precedence) [5,7]

10/

13..using multimodal transmission  [6]

10/

135..using single mode transmission  [6]

10/

14..Terminal stations  [5]

10/

142...Coherent homodyne or heterodyne systems  [6]

10/

145....Transmitters  [6]

10/

148....Receivers  [6]

10/

152...Non-coherent direct-detection systems  [6]

10/

155....Transmitters  [6]

10/

158....Receivers  [6]

10/

16..Repeaters  [5]

10/

17...in which processing or amplification is carried out without conversion of the signal from optical form  [6]

10/

18..Arrangements for reducing or eliminating distortion or dispersion, e.g. equalisers  [5]

10/

20..Arrangements for networking, e.g. bus or star coupling  [5]

10/

207...using a star-type coupler  [6]

10/

213...using a T-type coupler  [6]

10/

22.Transmission between two stations which are mobile relative to each other (H04B 10/30 takes precedence) [5,7]

10/

24.Bidirectional transmission (H04B 10/22, H04B 10/30 take precedence) [5,7]

10/

26..using a single light source for both stations involved  [6]

10/

28..using a single device as a light source or a light receiver  [6]

10/

30.Transmission systems employing beams of corpuscular radiation (arrangements for handling beams of corpuscular radiation, e.g. focusing, moderating, G21K 1/00) [7]

 


11/

00Transmission systems employing ultrasonic, sonic or infrasonic waves


13/

00Transmission systems characterised by the medium used for transmission, not provided for in groups H04B 3/00 to H04B 11/00

13/

02.Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy (line transmission systems with earth or water return H04B 3/00)


14/

00Transmission systems not characterised by the medium used for transmission (details thereof H04B 1/00) [4]

14/

02.characterised by the use of pulse modulation (in radio transmission relays H04B 7/17)  [4]

14/

04..using pulse code modulation (analogue/digital or digital/analogue conversion H03M 1/00)  [4]

14/

06..using differential modulation, e.g. delta modulation (conversion of analogue values to or from differential modulation H03M 3/00)  [4]

14/

08.characterised by the use of a sub-carrier  [4]


15/

00Suppression or limitation of noise or interference (by means associated with receiver H04B 1/10)

15/

02.Reducing interference from electric apparatus by means located at or near the interfering apparatus (structural association with dynamo-electric machines H02K 11/00)

15/

04..the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver, in a tape-recorder (reducing parasitic oscillations H03B, H03F; screening H05K 9/00)

15/

06...by local oscillators of receivers


17/

00Monitoring; Testing  [2]

17/

02.of relay systems  [2]


  H04 - H04B 5/06   
 

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