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Symbol IPC-Stellen auswählen Titel
A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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PHYSICS
H
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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 [1, 2006.01]
H04L 1/02
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by diversity reception [1, 2006.01]
H04L 1/04
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. . using frequency diversity [1, 2006.01]
H04L 1/06
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. . using space diversity [1, 2006.01]
H04L 1/08
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by repeating transmission, e.g. Verdan system [1, 2006.01]
H04L 1/12
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by using return channel [1, 2006.01]
H04L 1/14
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. . in which the signals are sent back to the transmitter to be checked [1, 2006.01]
H04L 1/16
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. . in which the return channel carries supervisory signals, e.g. repetition request signals [1, 2006.01]
H04L 1/18
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. . . Automatic repetition systems, e.g. van Duuren system [1, 2006.01]
H04L 1/20
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using signal-quality detector [3, 2006.01]
H04L 1/22
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using redundant apparatus to increase reliability [3, 2006.01]
H04L 1/24
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Testing correct operation [3, 2006.01]
H04L 5/00
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Arrangements affording multiple use of the transmission path [1, 2006.01]
H04L 7/00
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Arrangements for synchronising receiver with transmitter [1, 2006.01]
H04L 9/00
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Arrangements for secret or secure communication [1, 2006.01]
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, 2006.01]
H04L 13/00
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Details of the apparatus or circuits covered by groups H04L 15/00 or H04L 17/00 [1, 2006.01]
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) [1, 2006.01]
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 [1, 2006.01]
H04L 19/00
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Apparatus or local circuits for step-by-step systems [1, 2006.01]
H04L 21/00
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Apparatus or local circuits for mosaic printer telegraph systems [1, 2006.01]
H04L 23/00
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Apparatus or local circuits for telegraphic systems other than those covered by groups H04L 15/00-H04L 21/00 [1, 2006.01]
H04L 25/00
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Baseband systems [1, 2006.01]
H04L 27/00
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Modulated-carrier systems [1, 2006.01]
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, 2006.01]
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 (producing sounds with frequency not determined by supply frequency G10K) [6]
H04S
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STEREOPHONIC SYSTEMS [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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