EP0425834A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System and multiplexer/ demultiplexer for the transmission/ reception of digital television information
Assignee: Alcatel Lucent Italia SpA
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Filing: 1990-10-04
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Granted: —
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Expires: 2010-10-04
Abstract
Abstract It is described a system and related multiplexers/demultiplexers for the transmission/reception of digital television information (video + audio), included the high definition information (HDTV), in which it is used the transmission in packets and various work speeds are foreseen, among which a special transmission that uses two data flows transmitted contemporaneously for getting a sole information. The multiplexer is associated to external buffers that receive the data at different speeds, form the packet and generate requests of transmission to the multiplexer that receives them according to preestablished priorities.
Inventors
- 👤 Alessandra Rossi
- 👤 Antonio Campos
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 09:49
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; H04N21/2365; H04N21/40; H04N21/43; H04N21/434; H04N21/4347; H04N7/00; H04N7/24; H04N7/52; H04N7/54
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
159 words
1) A transmission system for TV, HDTV, audio and data signals, that come from different sources and can have speeds different with one another and arrive to a centralized part (multiplexer), characterized in that in transmission the signals at different speeds are each accumulated into a proper buffer, that forms the packet therewith and, when the packet is ready, requires to the centralized part (multiplexer) the enabling for transmitting the said packet; the multiplexer fulfils the request according to a prefixed priority order and adds to the packet a frame synchronization signal forming in this manner at least a data flow that can be also transmitted with at least a speed that can be selected in a range suitable for existing carrier waves; and in reception it carries out the new alignment of the information flow(s) onto the basis of the synchronization signal and after the packets are distributed to the various buffers and then to the related receivers.
Claim 2
Dependent Claim
159 words
1) A transmission system for TV, HDTV, audio and data signals, that come from different sources and can have speeds different with one another and arrive to a centralized part (multiplexer), characterized in that in transmission the signals at different speeds are each accumulated into a proper buffer, that forms the packet therewith and, when the packet is ready, requires to the centralized part (multiplexer) the enabling for transmitting the said packet; the multiplexer fulfils the request according to a prefixed priority order and adds to the packet a frame synchronization signal forming in this manner at least a data flow that can be also transmitted with at least a speed that can be selected in a range suitable for existing carrier waves; and in reception it carries out the new alignment of the information flow(s) onto the basis of the synchronization signal and after the packets are distributed to the various buffers and then to the related receivers.
Claim 3
Dependent Claim
39 words
2) A system according to claim 1, characterized in that the running of the multiplexer is foreseen with three different speeds in particular one flow with 34 Mb/s - two flows with 34 Mb/s, one flow with 140 Mbit/s.
Claim 4
Dependent Claim
17 words
3) A system according to claim 2, characterized in that the information is transmitted in two paths.
Claim 5
Dependent Claim
25 words
4) A system according to claim 1, characterized in that the free packets are replaced with interested packets causing the system to run as repeater.
Claim 6
Dependent Claim
10 words
5) A system substantially according to what described and represented.
Claim 7
Dependent Claim
10 words
5) A system substantially according to what described and represented.
Claim 8
Dependent Claim
81 words
6) An apparatus for the fulfilment of the system according to preceding claims, characterized in that it includes: - means for feeding information flows with different speeds to means forming data packets; - a multiplexer for multiplexing and transmitting one of said packets one at a time by at least one channel; - means for assigning the priority to packet forming means; - means for interrogating the multiplexer and for enabling this last multiplexer to transmit the packet with greather priority.
Claim 9
Dependent Claim
49 words
7) An apparatus according to claim 6, in which the transmitter includes a series of buffers in a number equal to the number of speeds of different channels; one multiplexer; linkages between buffers and multiplexer suitable for generating the priorities; synchronism and clock generators; at least one transmission channel.
Claim 10
Dependent Claim
51 words
8) An apparatus according to claim 7, in which the receiver includes a demultiplexer which is associated to a circuit for packet decision and destination; a series of buffers, a linkage network from these buffers to the demultiplexer suitable for reestablishing the priorities and a system for synchronization and clock regeneration.
Claim 11
Dependent Claim
32 words
9) An apparatus according to claims 7 and 8, in which the information flow is splitted in two transmission channels, each including one elastic store, one realignment generator and one delay trimmer.
Claim 12
Dependent Claim
26 words
10) An apparatus according to claim 9, in which the trimmer is a variable delay line preferably formed by many registers and multiplexers and one latch.
Claim 13
Dependent Claim
12 words
11) A system and apparatus substantially according to what described and represented.
Claim 14
Dependent Claim
12 words
11) A system and apparatus substantially according to what described and represented.
References Cited (Backward Citations)
No citation records indexed.
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