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IPC 7
 
H04-H04B00506
  H04B 7/00 - H04B 17/02  

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]


Note

 This subclass covers the transmission of information-carrying signals, the transmission being independent of the nature of the information, and includes monitoring and testing arrangements and the suppression and limitation of noise and interference.


Subclass Index

DETAILS 

H04B 1/00 

SYSTEMS CHARACTERISED BY THE MEDIUM USED FOR TRANSMISSION 

Using conductors 

H04B 3/00 

Using free-space propagation 

H04B 5/00 to H04B 11/00 

Others 

H04B 13/00 

SYSTEMS NOT CHARACTERISED BY THE MEDIUM USED FOR TRANSMISSION 

H04B 14/00 

SUPPRESSION OR LIMITATION OF NOISE OR INTERFERENCE 

H04B 15/00 

MONITORING, TESTING 

H04B 17/00 



1/

00Details of transmission systems, not covered by a single one of groups H04B 3/00 to H04B 13/00; Details of transmission systems not characterised by the medium used for transmission (tuning resonant circuits H03J) [4]

1/

02.Transmitters (spatial arrangements of component circuits in radio pills for living beings A61B 5/07)

1/

03..Constructional details, e.g. casings, housings  [2]

1/

034...Portable transmitters  [2]

1/

036...Cooling arrangements (cooling transformers H01F 27/08; cooling discharge tubes H01J 7/24, H01J 19/74)  [2]

1/

04..Circuits (of television transmitters H04N 5/38)

1/

06.Receivers (control of amplification H03G; television receivers H04N 5/44, H04N 5/64)

1/

08..Constructional details, e.g. cabinet

1/

10..Means associated with receiver for limiting or suppressing noise or interference

1/

12...Neutralising, balancing, or compensation arrangements

1/

14...Automatic detuning arrangements

1/

16..Circuits

1/

18...Input circuits, e.g. for coupling to an aerial or a transmission line (input circuits for amplifiers in general H03F; coupling networks between aerials or lines and receivers independent of the nature of the receiver H03H)

1/

20...for coupling gramophone pick-up, recorder output, or microphone to receiver

1/

22...for receivers in which no local oscillation is generated

1/

24....the receiver comprising at least one semiconductor device having three or more electrodes

1/

26...for superheterodyne receivers (multiple frequency-changing H03D 7/16)

1/

28....the receiver comprising at least one semiconductor device having three or more electrodes

1/

30...for homodyne or synchrodyne receivers (demodulator circuits H03D 1/22)

1/

38.Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving

1/

40..Circuits

1/

44...Transmit/receive switching (tubes therefor H01J 17/64; waveguide switches H01P 1/10)  [2]

1/

46....by voice-frequency signals; by pilot signals

1/

48....in circuit for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter (in radar systems G01S)

1/

50...using different frequencies for the two directions of communication

1/

52....Hybrid arrangements, i.e. for transition from single-path two-way transmission to single transmission on each of two paths, or vice versa

1/

54...using the same frequency for both directions of communication (H04B 1/44 takes precedence)

1/

56....with provision for simultaneous communication in both directions

1/

58....Hybrid arrangements, i.e. for transition from single-path two-way transmission to single transmission on each of two paths, or vice versa

1/

59.Responders; Transponders (relay systems H04B 7/14)

1/

60.Supervising unattended repeaters

1/

62.for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio

1/

64..Volume compression or expansion arrangements

1/

66.for reducing bandwidth of signals (in speech analysis-synthesis techniques G10L 19/00; in pictorial communication systems H04N); for improving efficiency of transmission (H04B 1/68 takes precedence)

1/

68.for wholly or partially suppressing the carrier or one side band  [4]

1/

69.Spread spectrum techniques in general (for code multiplex systems H04J 13/02)  [6]

1/

707..using direct sequence modulation  [6]

1/

713..using frequency hopping  [6]

1/

72.Circuits or components for simulating aerials, e.g. dummy aerial (dissipative waveguide terminations H01P 1/26)

1/

74.for increasing reliability, e.g. using redundant or spare channels or apparatus  [3]

1/

76.Pilot transmitters or receivers for control of transmission or for equalising  [3]


3/

00Line transmission systems (combined with near-field transmission systems H04B 5/00; constructional features of cables H01B 11/00)

3/

02.Details

3/

03..Hybrid circuits (for transceivers H04B 1/52, H04B 1/58; hybrid junctions of the waveguide type H01P 5/16)  [3]

3/

04..Control of transmission; Equalising (control of amplification in general H03G)

3/

06...by the transmitted signal

3/

08....in negative-feedback path of line amplifier

3/

10...by pilot signal

3/

11....using pilot wire (H04B 3/12 take precedence)  [3]

3/

12....in negative-feedback path of line amplifier

3/

14...characterised by the equalising network used

3/

16...characterised by the negative-impedance network used

3/

18....wherein the network comprises semiconductor devices

3/

20..Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

3/

21...using a set of bandfilters  [3]

3/

23...using a replica of transmitted signal in the time domain, e.g. echo cancellers  [3]

3/

26..Improving frequency characteristic by the use of loading coils (loading coils per se H01F 17/08)

3/

28..Reducing interference caused by currents induced in cable sheathing or armouring

3/

30..Reducing interference caused by unbalance current in a normally balanced line

3/

32..Reducing cross-talk, e.g. by compensating

3/

34...by systematic interconnection of lengths of cable during laying; by addition of balancing components to cable during laying

3/

36..Repeater circuits (H04B 3/58 takes precedence; amplifiers therefor H03F)

3/

38...for signals in two different frequency ranges transmitted in opposite directions over the same transmission path

3/

40..Artificial lines; Networks simulating a line of certain length

3/

42..Circuits for by-passing of ringing signals

3/

44..Arrangements for feeding power to a repeater along the transmission line

3/

46..Monitoring; Testing

3/

48...Testing attenuation

3/

50.Systems for transmission between fixed stations via two-conductor transmission lines (H04B 3/54 takes precedence)

3/

52.Systems for transmission between fixed stations via waveguides

3/

54.Systems for transmission via power distribution lines (in alarm signalling systems G08B 25/06; remote indication of power network conditions, remote control of switching means in a power distribution network H02J 13/00)

3/

56..Circuits for coupling, blocking, or by-passing of signals

3/

58..Repeater circuits (amplifiers therefor H03F)

3/

60.Systems for communication between relatively movable stations, e.g. for communication with lift (H04B 3/54 takes precedence)


5/

00Near-field transmission systems, e.g. inductive loop type

5/

02.using transceiver

5/

04.Calling systems, e.g. paging system

5/

06.using a portable transmitter associated with a microphone

   H04B 7/00 - H04B 17/02  
 

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