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H04B
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TRANSMISSION[4]
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H04H
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BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects—of broadcast systems H04N)
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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)
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H04K
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SECRET COMMUNICATION; JAMMING OF COMMUNICATION
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H04L
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TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)[4]
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H04M
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TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
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H04N
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PICTORIAL COMMUNICATION, e.g. TELEVISION[4]
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H04Q
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SELECTING (switches, relays, selectors H01H; —wireless communication networks H04W)[1,2009.01]
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H04R
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LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)[6]
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H04S
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STEREOPHONIC SYSTEMS[3]
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H04W
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WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M 1/72)[2009.01]
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