H
SECTION H — ELECTRICITY
 H04
ELECTRIC COMMUNICATION TECHNIQUE
 H04J
MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to telegraphic communication H04L 5/00; systems for transmitting television signals simultaneously or sequentially H04N 7/08; in exchanges H04Q 11/00)
 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 1/06
·  ·  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
 H04J 1/20
·  in which at least one carrier is angle-modulated
 H04J 3/00
Time-division multiplex systems
 H04J 3/02
·  Details
 H04J 3/04
·  ·  Distributors combined with modulators or demodulators (distributors in general H03K 19/40)
 H04J 3/06
·  ·  Synchronising arrangements
 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 (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 (H04J 13/00 takes precedence)  [2]
 H04J 5/00
( transferred to H04J 6/02 )
 H04J 6/00
Multiplex systems with address-coding (relay stations H04B 7/14; selecting techniques 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 (H04J 13/00 takes precedence)  [2]
 H04J 13/00
Code multiplex systems  [2]
 H04J 15/00
Multiplex systems not otherwise provided for  [2]