MULTIPLEX COMMUNICATION (transmission in general H 04 B; peculiar to transmission of digital information H 04 L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H 04 N 7/08; in exchanges H 04 Q 11/00; stereophonic systems H 04 S)
Note
This subclass covers:
-
circuits or apparatus for combining or dividing signals for the purpose of transmitting them simultaneously or sequentially over the same transmission path;
-
monitoring arrangements therefor.
1
/
00
Frequency-division multiplex systems (H 04 J 14/00 takes precedence) [5]
1
/
02
•
Details
1
/
04
•
•
Frequency-transposition arrangements
1
/
05
•
•
•
using digital techniques [3]
1
/
06
•
•
Arrangements for supplying the carrier waves
1
/
08
•
•
Arrangements for combining channels
1
/
10
•
•
Intermediate station arrangements, e.g. for branching, for tapping-off
1
/
12
•
•
Arrangements for reducing cross-talk between channels
1
/
14
•
•
Arrangements providing for calling or supervisory signals
1
/
16
•
•
Monitoring arrangements
1
/
18
•
in which all the carriers are amplitude-modulated (H 04 J 1/02
takes precedence) [3]
1
/
20
•
in which at least one carrier is angle-modulated (H 04 J 1/02 takes precedence) [3]
3
/
00
Time-division multiplex systems (H 04 J 14/00 takes precedence; relay systems
H 04 B 7/14; selecting techniques H 04 Q) [4,5]
3
/
02
•
Details (electronic switching or gating H 03 K 17/00)
3
/
04
•
•
Distributors combined with modulators or demodulators
3
/
06
•
•
Synchronising arrangements
3
/
07
•
•
•
using pulse stuffing for systems with different or fluctuating information rates [3]
3
/
08
•
•
Intermediate station arrangements, e.g. for branching, for tapping-off
3
/
10
•
•
Arrangements for reducing cross-talk between channels
3
/
12
•
•
Arrangements providing for calling or supervisory signals
3
/
14
•
•
Monitoring arrangements
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 (H 04 J 3/17, H 04 J 3/24 take precedence) [4]
3
/
17
•
in which the 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 [4]
3
/
18
•
using frequency compression and subsequent expansion of the individual signals
3
/
20
•
using resonant transfer [2]
3
/
22
•
in which the sources have different rates or codes [4]
