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Symbol IPC-Stellen auswählen Titel
A
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SECTION A — HUMAN NECESSITIES
B
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SECTION B — PERFORMING OPERATIONSTRANSPORTING
C
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SECTION C — CHEMISTRYMETALLURGY
D
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SECTION D — TEXTILESPAPER
E
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SECTION E — FIXED CONSTRUCTIONS
F
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SECTION F — MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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SECTION G — PHYSICS
H
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SECTION H — ELECTRICITY
H01
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BASIC ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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BASIC ELECTRONIC CIRCUITRY
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H04B
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TRANSMISSION [4]
H04H
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BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04J
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MULTIPLEX COMMUNICATION (peculiar to transmission of digital information H04L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N 7/08; in exchanges H04Q 11/00)
H04K
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SECRET COMMUNICATIONJAMMING OF COMMUNICATION
H04L
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TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) [4]
H04L 1/00
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Arrangements for detecting or preventing errors in the information received
H04L 5/00
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Arrangements affording multiple use of the transmission path
H04L 7/00
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Arrangements for synchronising receiver with transmitter
H04L 9/00
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Arrangements for secret or secure communication
H04L 12/00
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Data switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F 13/00) [5]
H04L 13/00
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Details of the apparatus or circuits covered by groups H04L 15/00 or H04L 17/00
H04L 15/00
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Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; telegraph tapping keys H01H 21/86)
H04L 17/00
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Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
H04L 19/00
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Apparatus or local circuits for step-by-step systems
H04L 21/00
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Apparatus or local circuits for mosaic printer telegraph systems
H04L 23/00
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Apparatus or local circuits for systems other than those covered by groups H04L 15/00-H04L 21/00
H04L 25/00
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Baseband systems
H04L 27/00
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Modulated-carrier systems
H04L 27/01
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Equalisers [5]
H04L 27/02
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Amplitude-modulated carrier systems, e.g. using on/off keyingSingle sideband or vestigial sideband modulation (H04L 27/32 takes precedence) [2, 5]
H04L 27/04
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. . Modulator circuitsTransmitter circuits
H04L 27/06
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. . Demodulator circuitsReceiver circuits
H04L 27/08
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. . Amplitude regulation arrangements
H04L 27/10
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Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L 27/32 takes precedence) [5]
H04L 27/12
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. . Modulator circuitsTransmitter circuits
H04L 27/14
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. . Demodulator circuitsReceiver circuits
H04L 27/144
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. . . with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements [6]
H04L 27/148
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. . . . using filters, including PLL-type filters [6]
H04L 27/152
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. . . . using controlled oscillators, e.g. PLL arrangements [6]
H04L 27/156
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. . . with demodulation using temporal properties of the received signal, e.g. detecting pulse width [6]
H04L 27/16
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. . Frequency regulation arrangements
H04L 27/18
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Phase-modulated carrier systems, i.e. using phase-shift keying (H04L 27/32 takes precedence) [5]
H04L 27/20
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. . Modulator circuitsTransmitter circuits
H04L 27/22
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. . Demodulator circuitsReceiver circuits
H04L 27/227
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. . . using coherent demodulation [6]
H04L 27/233
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. . . using non-coherent demodulation [6]
H04L 27/24
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. . Half-wave signalling systems
H04L 27/26
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Systems using multi-frequency codes (H04L 27/32 takes precedence) [5]
H04L 27/28
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. . with simultaneous transmission of different frequencies each representing one code element
H04L 27/30
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. . wherein each code element is represented by a combination of frequencies
H04L 27/32
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Carrier systems characterised by combinations of two or more of the types covered by groups H04L 27/02, H04L 27/10, H04L 27/18, or H04L 27/26 [5]
H04L 27/34
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. . Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems [5]
H04L 27/36
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. . . Modulator circuitsTransmitter circuits [5]
H04L 27/38
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. . . Demodulator circuitsReceiver circuits [5]
H04L 29/00
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Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L 1/00-H04L 27/00 [5]
H04M
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TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
H04N
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PICTORIAL COMMUNICATION, e.g. TELEVISION [4]
H04Q
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SELECTING (switches, relays, selectors H01H;  wireless communication networks H04W) [1, 2009.01]
H04R
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LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERSDEAF-AID SETSPUBLIC ADDRESS SYSTEMS (generating mechanical vibrations in general B06B; transducers for measuring particular variables G01; transducers in clocks G04; producing sounds with frequency not determined by supply frequency G10K; transducers in recording or reproducing heads G11B; transducers in motors H02) [6]
H04S
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STEREOPHONIC SYSTEMS (information storage on discs or tapes G11B; broadcast systems for the distribution of stereophonic information H04H 20/88; multiplex systems in general H04J) [3]
H04W
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WIRELESS COMMUNICATION NETWORKS [2009.01]
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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