IPC-Stelle: H04B 1/00 [Version 2006.01]

SymbolTypTitel
HSKSECTION H — ELECTRICITY
H04KLELECTRIC COMMUNICATION TECHNIQUE
H04BUKLTRANSMISSION (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]
H04B 1/00HGRDetails of transmission systems, not covered by a single one of groups H04B 3/00-H04B 13/00; Details of transmission systems not characterised by the medium used for transmission (tuning resonant circuits H03J) [4]
H04B 1/02UGR1
.Transmitters (spatial arrangements of component circuits in radio pills for living beings A61B 5/07)
H04B 1/03UGR2
. .Constructional details, e.g. casings, housings [2]
H04B 1/034UGR3
. . .Portable transmitters [2]
H04B 1/036UGR3
. . .Cooling arrangements (cooling transformers H01F 27/08; cooling discharge tubes H01J 7/24, H01J 19/74) [2]
H04B 1/04UGR2
. .Circuits (of television transmitters H04N 5/38)
H04B 1/06UGR1
.Receivers (control of amplification H03G; television receivers H04N 5/44, H04N 5/64)
H04B 1/08UGR2
. .Constructional details, e.g. cabinet
H04B 1/10UGR2
. .Means associated with receiver for limiting or suppressing noise or interference
H04B 1/12UGR3
. . .Neutralising, balancing, or compensation arrangements
H04B 1/14UGR3
. . .Automatic detuning arrangements
H04B 1/16UGR2
. .Circuits
H04B 1/18UGR3
. . .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)
H04B 1/20UGR3
. . .for coupling gramophone pick-up, recorder output, or microphone to receiver
H04B 1/22UGR3
. . .for receivers in which no local oscillation is generated
H04B 1/24UGR4
. . . .the receiver comprising at least one semiconductor device having three or more electrodes
H04B 1/26UGR3
. . .for superheterodyne receivers (multiple frequency-changing H03D 7/16)
H04B 1/28UGR4
. . . .the receiver comprising at least one semiconductor device having three or more electrodes
H04B 1/30UGR3
. . .for homodyne or synchrodyne receivers (demodulator circuits H03D 1/22)
H04B 1/38UGR1
.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
H04B 1/40UGR2
. .Circuits
H04B 1/44UGR3
. . .Transmit/receive switching (in radar systems G01S; tubes therefor H01J 17/64; waveguide switches H01P 1/10) [2]
H04B 1/46UGR4
. . . .by voice-frequency signals; by pilot signals
H04B 1/48UGR4
. . . .in circuit for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter
H04B 1/50UGR3
. . .using different frequencies for the two directions of communication
H04B 1/52UGR4
. . . .Hybrid arrangements, i.e. for transition from single-path two-way transmission to single transmission on each of two paths, or vice versa
H04B 1/54UGR3
. . .using the same frequency for both directions of communication (H04B 1/44 takes precedence)
H04B 1/56UGR4
. . . .with provision for simultaneous communication in both directions
H04B 1/58UGR4
. . . .Hybrid arrangements, i.e. for transition from single-path two-way transmission to single transmission on each of two paths, or vice versa
H04B 1/59UGR1
.Responders; Transponders (relay systems H04B 7/14)
H04B 1/60UGR1
.Supervising unattended repeaters
H04B 1/62UGR1
.for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
H04B 1/64UGR2
. .Volume compression or expansion arrangements
H04B 1/66UGR1
.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)
H04B 1/68UGR1
.for wholly or partially suppressing the carrier or one side band [4]
H04B 1/69UGR1
.Spread spectrum techniques in general (for code multiplex systems H04J 13/02) [6]
H04B 1/707UGR2
. .using direct sequence modulation [6]
H04B 1/713UGR2
. .using frequency hopping [6]
H04B 1/72UGR1
.Circuits or components for simulating aerials, e.g. dummy aerial (dissipative waveguide terminations H01P 1/26)
H04B 1/74UGR1
.for increasing reliability, e.g. using redundant or spare channels or apparatus [3]
H04B 1/76UGR1
.Pilot transmitters or receivers for control of transmission or for equalising [3]
H04B 3/00HGRLine transmission systems (combined with near-field transmission systems H04B 5/00; constructional features of cables H01B 11/00)
H04B 3/02UGR1
.Details
H04B 3/03UGR2
. .Hybrid circuits (for transceivers H04B 1/52, H04B 1/58; hybrid junctions of the waveguide type H01P 5/16) [3]
H04B 3/04UGR2
. .Control of transmission; Equalising (control of amplification in general H03G)
H04B 3/06UGR3
. . .by the transmitted signal
H04B 3/08UGR4
. . . .in negative-feedback path of line amplifier
H04B 3/10UGR3
. . .by pilot signal
H04B 3/11UGR4
. . . .using pilot wire (H04B 3/12 take precedence) [3]
H04B 3/12UGR4
. . . .in negative-feedback path of line amplifier
H04B 3/14UGR3
. . .characterised by the equalising network used
H04B 3/16UGR3
. . .characterised by the negative-impedance network used
H04B 3/18UGR4
. . . .wherein the network comprises semiconductor devices
H04B 3/20UGR2
. .Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
H04B 3/21UGR3
. . .using a set of bandfilters [3]
H04B 3/23UGR3
. . .using a replica of transmitted signal in the time domain, e.g. echo cancellers [3]
H04B 3/26UGR2
. .Improving frequency characteristic by the use of loading coils (loading coils per seH01F 17/08)
H04B 3/28UGR2
. .Reducing interference caused by currents induced in cable sheathing or armouring
H04B 3/30UGR2
. .Reducing interference caused by unbalance current in a normally balanced line
H04B 3/32UGR2
. .Reducing cross-talk, e.g. by compensating
H04B 3/34UGR3
. . .by systematic interconnection of lengths of cable during laying; by addition of balancing components to cable during laying
H04B 3/36UGR2
. .Repeater circuits (H04B 3/58 takes precedence; amplifiers therefor H03F)
H04B 3/38UGR3
. . .for signals in two different frequency ranges transmitted in opposite directions over the same transmission path
H04B 3/40UGR2
. .Artificial lines; Networks simulating a line of certain length
H04B 3/42UGR2
. .Circuits for by-passing of ringing signals
H04B 3/44UGR2
. .Arrangements for feeding power to a repeater along the transmission line
H04B 3/46UGR2
. .Monitoring; Testing
H04B 3/48UGR3
. . .Testing attenuation
H04B 3/50UGR1
.Systems for transmission between fixed stations via two-conductor transmission lines (H04B 3/54 takes precedence)
H04B 3/52UGR1
.Systems for transmission between fixed stations via waveguides
H04B 3/54UGR1
.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)
H04B 3/56UGR2
. .Circuits for coupling, blocking, or by-passing of signals
H04B 3/58UGR2
. .Repeater circuits (amplifiers therefor H03F)
H04B 3/60UGR1
.Systems for communication between relatively movable stations, e.g. for communication with lift (H04B 3/54 takes precedence)
H04B 5/00HGRNear-field transmission systems, e.g. inductive loop type
H04B 5/02UGR1
.using transceiver
H04B 5/04UGR1
.Calling systems, e.g. paging system
H04B 5/06UGR1
.using a portable transmitter associated with a microphone
H04B 7/00HGRRadio transmission systems, i.e. using radiation field (H04B 10/00, H04B 15/00 take precedence)
H04B 7/005UGR1
.Control of transmission; Equalising [3]
H04B 7/01UGR1
.Reducing phase shift [3]
H04B 7/015UGR1
.Reducing echo effects [3]
H04B 7/02UGR1
.Diversity systems (for direction finding G01S 3/72; aerial arrays or systems H01Q)
H04B 7/04UGR2
. .using a plurality of spaced independent aerials
H04B 7/06UGR3
. . .at transmitting station
H04B 7/08UGR3
. . .at receiving station
H04B 7/10UGR2
. .using a single aerial system characterised by its polarisation or directive properties, e.g. polarisation diversity, direction diversity
H04B 7/12UGR2
. .Frequency-diversity systems
H04B 7/14UGR1
.Relay systems (interrogator-responder radar systems G01S 13/74) [2]
H04B 7/145UGR2
. .Passive relay systems [2]
H04B 7/15UGR2
. .Active relay systems [2]
H04B 7/155UGR3
. . .Ground-based stations (H04B 7/204 takes precedence) [2, 5]
H04B 7/165UGR4
. . . .employing angle modulation [2]
H04B 7/17UGR4
. . . .employing pulse modulation, e.g. pulse code modulation [2]
H04B 7/185UGR3
. . .Space-based or airborne stations (H04B 7/204 takes precedence) [2, 5]
H04B 7/19UGR4
. . . .Earth-synchronous stations [2]
H04B 7/195UGR4
. . . .Non-synchronous stations [2]
H04B 7/204UGR3
. . .Multiple access [5]
H04B 7/208UGR4
. . . .Frequency-division multiple access [5]
H04B 7/212UGR4
. . . .Time-division multiple access [5]
H04B 7/216UGR4
. . . .Code-division or spread-spectrum multiple access (spread spectrum techniques in general H04B 1/69) [5]
H04B 7/22UGR1
.Scatter propagation systems
H04B 7/24UGR1
.for communication between two or more posts (for selecting H04Q 7/00) [2]
H04B 7/26UGR2
. .at least one of which is mobile [2]
H04B 10/00HGRTransmission 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]
H04B 10/02UGR1
.Details [5]
H04B 10/04UGR2
. .Transmitters [5]
H04B 10/06UGR2
. .Receivers [5]
H04B 10/08UGR2
. .Equipment for monitoring, testing or fault measuring [5]
H04B 10/10UGR1
.Transmission through free space, e.g. through the atmosphere (H04B 10/22, H04B 10/24, H04B 10/30 take precedence) [5, 7]
H04B 10/105UGR2
. .specially adapted for satellite links [6]
H04B 10/12UGR1
.Transmission through light guides, e.g. optical fibres (H04B 10/22, H04B 10/24, H04B 10/30 take precedence) [5, 7]
H04B 10/13UGR2
. .using multimodal transmission [6]
H04B 10/135UGR2
. .using single mode transmission [6]
H04B 10/14UGR2
. .Terminal stations [5]
H04B 10/142UGR3
. . .Coherent homodyne or heterodyne systems [6]
H04B 10/145UGR4
. . . .Transmitters [6]
H04B 10/148UGR4
. . . .Receivers [6]
H04B 10/152UGR3
. . .Non-coherent direct-detection systems [6]
H04B 10/155UGR4
. . . .Transmitters [6]
H04B 10/158UGR4
. . . .Receivers [6]
H04B 10/16UGR2
. .Repeaters [5]
H04B 10/17UGR3
. . .in which processing or amplification is carried out without conversion of the signal from optical form [6]
H04B 10/18UGR2
. .Arrangements for reducing or eliminating distortion or dispersion, e.g. equalisers [5]
H04B 10/20UGR2
. .Arrangements for networking, e.g. bus or star coupling [5]
H04B 10/207UGR3
. . .using a star-type coupler [6]
H04B 10/213UGR3
. . .using a T-type coupler [6]
H04B 10/22UGR1
.Transmission between two stations which are mobile relative to each other (H04B 10/30 takes precedence) [5, 7]
H04B 10/24UGR1
.Bidirectional transmission (H04B 10/22, H04B 10/30 take precedence) [5, 7]
H04B 10/26UGR2
. .using a single light source for both stations involved [6]
H04B 10/28UGR2
. .using a single device as a light source or a light receiver [6]
H04B 10/30UGR1
.Transmission systems employing beams of corpuscular radiation (arrangements for handling beams of corpuscular radiation, e.g. focusing, moderating, G21K 1/00) [7]
H04B 11/00HGRTransmission systems employing ultrasonic, sonic or infrasonic waves
H04B 13/00HGRTransmission systems characterised by the medium used for transmission, not provided for in groups H04B 3/00-H04B 11/00
H04B 13/02UGR1
.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)
H04B 14/00HGRTransmission systems not characterised by the medium used for transmission (details thereof H04B 1/00) [4]
H04B 14/02UGR1
.characterised by the use of pulse modulation (in radio transmission relays H04B 7/17) [4]
H04B 14/04UGR2
. .using pulse code modulation (analogue/digital or digital/analogue conversion H03M 1/00) [4]
H04B 14/06UGR2
. .using differential modulation, e.g. delta modulation (conversion of analogue values to or from differential modulation H03M 3/00) [4]
H04B 14/08UGR1
.characterised by the use of a sub-carrier [4]
H04B 15/00HGRSuppression or limitation of noise or interference (by means associated with receiver H04B 1/10)
H04B 15/02UGR1
.Reducing interference from electric apparatus by means located at or near the interfering apparatus (structural association with dynamo-electric machines H02K 11/00; screening H05K 9/00)
H04B 15/04UGR2
. .the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver, in a tape-recorder (reducing parasitic oscillations H03B, F)
H04B 15/06UGR3
. . .by local oscillators of receivers
H04B 17/00HGRMonitoring; Testing [2]
H04B 17/02UGR1
.of relay systems [2]