|  | H |
SECTION H — ELECTRICITY

|  | H04 |
ELECTRIC COMMUNICATION TECHNIQUE

|  | H04J |
MULTIPLEX COMMUNICATION (transmission in general Fulltext... Hierarchy... Expanded...H04B; peculiar to transmission of digital information Fulltext... Hierarchy... Expanded...H04L 5/00; systems for transmitting television signals simultaneously or sequentially Fulltext... Hierarchy... Expanded...H04N 7/08; in exchanges Fulltext... Hierarchy... Expanded...H04Q 11/00; stereophonic systems Fulltext... Hierarchy... Expanded...H04S)

|  | H04J |
Note(s) This sub-class deals with (a) circuits or apparatus for combining or dividing signals for the purpose of transmitting them simultaneously or sequentially over the same transmission path, and (b) monitoring arrangements therefor.

|  | H04J 1/00 |
Frequency-division multiplex systems

|  | H04J 1/02 |
· | Details

|  | H04J 1/04 |
· · | Frequency-transposition arrangements

|  | H04J 1/05 |
· · · | using digital techniques [3]

|  | H04J 1/06 |
· · | Arrangements for supplying the carrier waves

|  | H04J 1/08 |
· · | Arrangements for combining channels

|  | H04J 1/10 |
· · | Intermediate station arrangements, e.g. for branching, for tapping-off

|  | H04J 1/12 |
· · | Arrangements for reducing cross-talk between channels

|  | H04J 1/14 |
· · | Arrangements providing for calling or supervisory signals

|  | H04J 1/16 |
· · | Monitoring arrangements

|  | H04J 1/18 |
· | in which all the carriers are amplitude-modulated (Fulltext... Hierarchy... Expanded...H04J 1/02 takes precedence)

|  | H04J 1/20 |
· | in which at least one carrier is angle-modulated (Fulltext... Hierarchy... Expanded...H04J 1/02 takes precedence)

|  | H04J 3/00 |
Time-division multiplex systems

|  | H04J 3/02 |
· | Details (electronic switching or gating Fulltext... Hierarchy... Expanded...H03K 17/00)

|  | H04J 3/04 |
· · | Distributors combined with modulators or demodulators

|  | H04J 3/06 |
· · | Synchronising arrangements

|  | H04J 3/07 |
· · · | using pulse stuffing for systems with different or fluctuating information rates [3]

|  | H04J 3/08 |
· · | Intermediate station arrangements, e.g. for branching, for tapping-off

|  | H04J 3/10 |
· · | Arrangements for reducing cross-talk between channels

|  | H04J 3/12 |
· · | Arrangements providing for calling or supervisory signals

|  | H04J 3/14 |
· · | Monitoring arrangements

|  | H04J 3/16 |
· | in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted (Fulltext... Hierarchy... Expanded...H04J 6/00 takes precedence)

|  | H04J 3/18 |
· | using frequency compression and subsequent expansion of the individual signals

|  | H04J 3/20 |
· | using resonant transfer [2]

|  | H04J 4/00 |
Combined time-division and frequency-division multiplex systems (Fulltext... Hierarchy... Expanded...H04J 13/00 takes precedence) [2]

|  | H04J 6/00 |
Multiplex systems with address-coding (relay stations Fulltext... Hierarchy... Expanded...H04B 7/14; selecting techniques Fulltext... Hierarchy... Expanded...H04Q) [2]

|  | H04J 6/02 |
· | Multiplex systems in which a transmission channel allotted to a first user may be taken away and re-allotted to a second user if the first user becomes inactive, e.g. TASI [2]

|  | H04J 7/00 |
Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels

|  | H04J 7/02 |
· | in which the polarity of the amplitude is characteristic

|  | H04J 9/00 |
Multiplex systems in which each channel is represented by a different type of modulation of the carrier

|  | H04J 11/00 |
Orthogonal multiplex systems (Fulltext... Hierarchy... Expanded...H04J 13/00 takes precedence) [2]

|  | H04J 13/00 |
Code multiplex systems [2]

|  | H04J 15/00 |
Multiplex systems not otherwise provided for [2]