CA2257571A1 - Wide-band information system for distribution services and interactive services - Google Patents
Wide-band information system for distribution services and interactive services Download PDFInfo
- Publication number
- CA2257571A1 CA2257571A1 CA002257571A CA2257571A CA2257571A1 CA 2257571 A1 CA2257571 A1 CA 2257571A1 CA 002257571 A CA002257571 A CA 002257571A CA 2257571 A CA2257571 A CA 2257571A CA 2257571 A1 CA2257571 A1 CA 2257571A1
- Authority
- CA
- Canada
- Prior art keywords
- wide
- band
- channels
- information system
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/69—Optical systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2365—Multiplexing of several video streams
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Television Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
A wide-band information system for distribution services and interactive services is being proposed that possesses an information center (6) and a wide-band network (5) as well as a converter with at least one coaxial network whereby the data are transmitted digitally for the wide-band network and whereby, for modulating and digitizing the channels in the information center, a separate digitizer is present for each channel and whereby the digitized channels are integrated via a multiplexes (8) into one digital data stream.
Description
Wide-band information system for distribution services and interactive services The invention proceeds from a wide-band information system for distribution services and interactive services of the sort of the primary claim.
From DE-OS 44 35 767, a wide-band information system is known whereby data are transmitted in both analog and digital ways. Today, there are already numerous participants connected over coaxial networks with television stations or other services. Over these networks, pay-on-demand television can be developed in a simple form in addition to reception of cable television programs, however without having to interact with the broadcasting source. In the future, video on demand with direct access to video databases will be possible. The wide-band networks that [sic] the connection between information centers and converter units that produce the connection to individual participants are being increasingly expanded with fiber optic cable. In the end, however, when using the converter unit, signals must be transferred onto a coaxial network.
In general, the use of coaxial cables as a medium for transmitting television and sound signals up to a frequency of ca. 1 GHz and for the analog transmission of television and sound signals is possible in a range from 47 MHz to 450 MHz. In order to optimize transmission over optical wide-band networks, data from individual channels are today transmitted digitally.
From DE-OS 44 35 767, a wide-band information system is known whereby data are transmitted in both analog and digital ways. Today, there are already numerous participants connected over coaxial networks with television stations or other services. Over these networks, pay-on-demand television can be developed in a simple form in addition to reception of cable television programs, however without having to interact with the broadcasting source. In the future, video on demand with direct access to video databases will be possible. The wide-band networks that [sic] the connection between information centers and converter units that produce the connection to individual participants are being increasingly expanded with fiber optic cable. In the end, however, when using the converter unit, signals must be transferred onto a coaxial network.
In general, the use of coaxial cables as a medium for transmitting television and sound signals up to a frequency of ca. 1 GHz and for the analog transmission of television and sound signals is possible in a range from 47 MHz to 450 MHz. In order to optimize transmission over optical wide-band networks, data from individual channels are today transmitted digitally.
Here, individual channels are modulated, subject to an up-conversion, added, and finally delta/sigma-modulated. In this way, a single data stream is created that exhibits a mixture of the different original channels and with which it is no longer possible to influence the individual channels. In the converter unit, there is only one common modulation possible in order then to finally execute conventional channel processing.
The wide-band transmission system relating to the invention with the characteristic properties of the primary claim has the additional advantage that the individual channels in the information center are delta/sigma-modulated separately from each other and that only at the end are the digitized and modulated channels integrated within an appropriate multiplexer into a single digital data stream. This way, one obtains digitized data that can be distributed over existing high-bit transmission systems and can be used in data formats such as SDH/SONET/ADM. This way, it is possible to select individual data packages in the converter unit, and it is no longer necessary to always demodulate the common data stream in each converter unit.
Through the measures detailed in the sub-claims, advantageous extensions and improvements of the wide-band transmission system indicated in the main claim are possible. Particularly advantageous is that, within the converter unit, channels can be selectively recovered by implementing a demultiplexer, a digital up-converter, and a digital/analog transformer for recovering individual channels. Through control in the converter unit, either a complete recovery of a11 fed-in data channels or selective recovery is then possible.
Advantageously, an SDH transportation system is used as a wide-band transmission network whereby multiplexers and demultiplexers have to be adapted in the system to the SDH
protocol. Through use of this known protocol, targeted access to data channels is possible and simple. The system makes possible through its routing functions this access.
Advantageously, in the system simple delta/sigma modulators and demodulators for modulating and demodulating digital signals are used.
An example of execution of the invention is depicted in the figure and explained in more detail in the following description. It shows in figure 1 the state of the technology in an information center; in figure 2 the construction of the information center relating to the invention; and in figure 3 the construction of a converter unit relating to the invention.
The data of the television channels (D1-Dn) are fed into a modulator (1) in the information center (6). The modulator (1) is tied respectively with an up-converter (2). The output of the up-converter (2) is connected with the input of an adder (3) whose output is again connected with a delta/sigma modulator (4). The output of the D-S modulator (4) is connected to the wide-band transmission network (5).
The data (D1-Dn) are modulated next in the information center. Here, each form of modulation is possible, e.g. a QPSK modulation or the different forms of QAM modulation.
The modulated data stream is transferred within the up-converter onto the carrier frequency that is located in the band below 450 MHz. This modulated data stream runs through the adder ( 3 ) in which the totality of all data streams is integrated into a channel mixture in the UHF frequency band. The UHF channel frequency runs through a D-S
modulator and has to be reset with large data rates, in general greater than 2.5 Gbit/sec. This data stream is transmitted over the wide-band network (5). On the converter unit side is the demodulation that again recovered a UHF channel mixture and fed into the coaxial network.
The system relating to the invention is depicted on broadcaster page 2 in the figure. The data stream (D1-Dn) again enters into a modulator (1). The output of the modulator (1) is connected respectively with a D-S
modulator (7) whose output connects at the input of a multiplexes (8). The multiplexes (8) is connected at the output with the wide-band transmission network (5). The entering digital video data streams are modulated in the modulators (1). Here, each form of modulation is possible.
The combination of quite different modulation processes is also possible in the modulator (1) for the respective data streams. The modulated HF signals indicate then a frequency clearly less than 100 MHz. These signals are fed into the digital modulator (7) that modulates the signals whereby the modulation takes place on the basis of timing signals that the multiplexes (8) provides to the individual modulators. The timing signals are different than the individual modulators (7), but they all indicate the same frequency. At the output of the modulator (7), there is for each channel an individually modulated data channel. This resulting data stream (D) possesses data rates from a few 100 Mbit and is fed into the multiplexer (8). The multiplexer resets the individual channels into a common data stream (C) that are the Gbit/sec., for example, and is fed into a wide-band transmission network (5). Here, the multiplexer adds information signals that enables routing functions within a certain protocol, e.g. SDH. Fed into the wide-band network, individual data channels can be further processed in accordance with the defaults of the network.
Figure 3 shows a converter (13) where the resetting of the wide-band network (5) takes places into the coaxial network (12). The converter (13) indicates at input a demultiplexer (9). The outputs of the demulitplexer (9) are connected with a digital up-converter (10) this is connected again with a digital/analog transformer (11). The output of the transformer (11) lies at the entrance of an adder (3) whose exit is tied with a coaxial network (12).
The incoming data stream (C) is recovered again into individual data streams (D) within the demultiplexer (9).
The individual data streams (D) assigned to a digitized data channel pass through a digital up-converter (10) such that each exiting data stream (E) obtains the assignment to a sub-carrier channel with a certain channel frequency in the VHF/UHF band. The demodulation takes place in the demodulator (11) by recovering the data in an analog fashion. The carrier frequency of each channel (G) is determined by an individual signal (F) that initializes the digital up-converter. Finally, a11 analog channels are added and the mixed signature fed into the coaxial network.
The transformers used in the wide-band transmission system in the [sic] are in the simplest case delta/sigma modulators and/or demodulators as these can be procured without great expense. In particular in the information centers (6), a whole array of modulators (4) become necessary as each channel indicates a specific digitalization. Thus, the implementation of the simple delta/sigma modulators leads to no great cost. Also in the converter (6), simple delta/sigma demodulators can be simply implemented and even here at no great cost requirement for the system. A great advantage of the suggested wide-band transmission system is that the used modulators can work with narrow bit rates and thus can be easily expanded. In the state of the technology, a digitizer that has to work at great expense with high data rates is being implemented. It is of further advantage that each channel can be managed individually and that out of the mixture of the channels an individual integration of channels is [sic] for each coaxial network. Even the adaptation of recently fed-in data to such a network is possible without problems.
The wide-band transmission system relating to the invention with the characteristic properties of the primary claim has the additional advantage that the individual channels in the information center are delta/sigma-modulated separately from each other and that only at the end are the digitized and modulated channels integrated within an appropriate multiplexer into a single digital data stream. This way, one obtains digitized data that can be distributed over existing high-bit transmission systems and can be used in data formats such as SDH/SONET/ADM. This way, it is possible to select individual data packages in the converter unit, and it is no longer necessary to always demodulate the common data stream in each converter unit.
Through the measures detailed in the sub-claims, advantageous extensions and improvements of the wide-band transmission system indicated in the main claim are possible. Particularly advantageous is that, within the converter unit, channels can be selectively recovered by implementing a demultiplexer, a digital up-converter, and a digital/analog transformer for recovering individual channels. Through control in the converter unit, either a complete recovery of a11 fed-in data channels or selective recovery is then possible.
Advantageously, an SDH transportation system is used as a wide-band transmission network whereby multiplexers and demultiplexers have to be adapted in the system to the SDH
protocol. Through use of this known protocol, targeted access to data channels is possible and simple. The system makes possible through its routing functions this access.
Advantageously, in the system simple delta/sigma modulators and demodulators for modulating and demodulating digital signals are used.
An example of execution of the invention is depicted in the figure and explained in more detail in the following description. It shows in figure 1 the state of the technology in an information center; in figure 2 the construction of the information center relating to the invention; and in figure 3 the construction of a converter unit relating to the invention.
The data of the television channels (D1-Dn) are fed into a modulator (1) in the information center (6). The modulator (1) is tied respectively with an up-converter (2). The output of the up-converter (2) is connected with the input of an adder (3) whose output is again connected with a delta/sigma modulator (4). The output of the D-S modulator (4) is connected to the wide-band transmission network (5).
The data (D1-Dn) are modulated next in the information center. Here, each form of modulation is possible, e.g. a QPSK modulation or the different forms of QAM modulation.
The modulated data stream is transferred within the up-converter onto the carrier frequency that is located in the band below 450 MHz. This modulated data stream runs through the adder ( 3 ) in which the totality of all data streams is integrated into a channel mixture in the UHF frequency band. The UHF channel frequency runs through a D-S
modulator and has to be reset with large data rates, in general greater than 2.5 Gbit/sec. This data stream is transmitted over the wide-band network (5). On the converter unit side is the demodulation that again recovered a UHF channel mixture and fed into the coaxial network.
The system relating to the invention is depicted on broadcaster page 2 in the figure. The data stream (D1-Dn) again enters into a modulator (1). The output of the modulator (1) is connected respectively with a D-S
modulator (7) whose output connects at the input of a multiplexes (8). The multiplexes (8) is connected at the output with the wide-band transmission network (5). The entering digital video data streams are modulated in the modulators (1). Here, each form of modulation is possible.
The combination of quite different modulation processes is also possible in the modulator (1) for the respective data streams. The modulated HF signals indicate then a frequency clearly less than 100 MHz. These signals are fed into the digital modulator (7) that modulates the signals whereby the modulation takes place on the basis of timing signals that the multiplexes (8) provides to the individual modulators. The timing signals are different than the individual modulators (7), but they all indicate the same frequency. At the output of the modulator (7), there is for each channel an individually modulated data channel. This resulting data stream (D) possesses data rates from a few 100 Mbit and is fed into the multiplexer (8). The multiplexer resets the individual channels into a common data stream (C) that are the Gbit/sec., for example, and is fed into a wide-band transmission network (5). Here, the multiplexer adds information signals that enables routing functions within a certain protocol, e.g. SDH. Fed into the wide-band network, individual data channels can be further processed in accordance with the defaults of the network.
Figure 3 shows a converter (13) where the resetting of the wide-band network (5) takes places into the coaxial network (12). The converter (13) indicates at input a demultiplexer (9). The outputs of the demulitplexer (9) are connected with a digital up-converter (10) this is connected again with a digital/analog transformer (11). The output of the transformer (11) lies at the entrance of an adder (3) whose exit is tied with a coaxial network (12).
The incoming data stream (C) is recovered again into individual data streams (D) within the demultiplexer (9).
The individual data streams (D) assigned to a digitized data channel pass through a digital up-converter (10) such that each exiting data stream (E) obtains the assignment to a sub-carrier channel with a certain channel frequency in the VHF/UHF band. The demodulation takes place in the demodulator (11) by recovering the data in an analog fashion. The carrier frequency of each channel (G) is determined by an individual signal (F) that initializes the digital up-converter. Finally, a11 analog channels are added and the mixed signature fed into the coaxial network.
The transformers used in the wide-band transmission system in the [sic] are in the simplest case delta/sigma modulators and/or demodulators as these can be procured without great expense. In particular in the information centers (6), a whole array of modulators (4) become necessary as each channel indicates a specific digitalization. Thus, the implementation of the simple delta/sigma modulators leads to no great cost. Also in the converter (6), simple delta/sigma demodulators can be simply implemented and even here at no great cost requirement for the system. A great advantage of the suggested wide-band transmission system is that the used modulators can work with narrow bit rates and thus can be easily expanded. In the state of the technology, a digitizer that has to work at great expense with high data rates is being implemented. It is of further advantage that each channel can be managed individually and that out of the mixture of the channels an individual integration of channels is [sic] for each coaxial network. Even the adaptation of recently fed-in data to such a network is possible without problems.
Claims (5)
1. Wide-band information system for distribution services and interactive services with an information center (6) and a wide-band network (5) as well as a converter unit (13) on which at least one coaxial network (12) is connected, whereby data are transmitted digitally over the wide-band network (5), characterized in that for modulation and digitalization of the channels in the information center (6) for every channel (D1-Dn) a separate D-S modulator (4) is present, and in that the digitized channels are brought together with a mulitplexer (8) for digital data streaming.
2. Wide-band information system for distribution service as under claim 1, characterized in that the data stream in the converter unit (13) runs through a demultiplexer (9), a digital up-converter (10), and a digital/analog changer (11) for recovery of the individual VHF/UHF channels.
3. Wide-band information system for distribution services as under claim 1 or claim 2, characterized in that in the converter unit (13) all recovered channels run through an adder (3) and are added to a UHF/VHF channel mixture.
4. Wide-band information system for distribution services under one of the preceding claims characterized in that the wide-band transmission network (5) is a SDH/SONET ADM
transportation system.
transportation system.
5. Wide-band information system for distribution services under one of the preceding claims characterized in that the demodulation in the converter units takes place with delta/sigma demodulators.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19804425.9 | 1998-02-05 | ||
| DE19804425A DE19804425A1 (en) | 1998-02-05 | 1998-02-05 | Broadband information system for distribution and interactive services |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2257571A1 true CA2257571A1 (en) | 1999-08-05 |
Family
ID=7856653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002257571A Abandoned CA2257571A1 (en) | 1998-02-05 | 1999-01-18 | Wide-band information system for distribution services and interactive services |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0935361A2 (en) |
| JP (1) | JPH11346212A (en) |
| CA (1) | CA2257571A1 (en) |
| DE (1) | DE19804425A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0286384A (en) * | 1988-09-22 | 1990-03-27 | Pioneer Electron Corp | Moving picture information service system and head end device for the system |
| DE4136111A1 (en) * | 1991-11-02 | 1993-05-06 | Ant Nachrichtentechnik Gmbh, 7150 Backnang, De | METHOD FOR PROCESSING CARRIED TELEVISION SIGNALS AND / OR SOUND SIGNALS AND APPLICATION |
| US5724091A (en) * | 1991-11-25 | 1998-03-03 | Actv, Inc. | Compressed digital data interactive program system |
| US5483238A (en) * | 1993-12-16 | 1996-01-09 | At&T Ipm Corp. | Data converter with gain scaling including dither |
| DE19542780B4 (en) * | 1995-11-16 | 2014-07-24 | Nokia Solutions And Networks Gmbh & Co. Kg | Process for integrating access to broadband services into existing computer services |
-
1998
- 1998-02-05 DE DE19804425A patent/DE19804425A1/en not_active Withdrawn
-
1999
- 1999-01-18 CA CA002257571A patent/CA2257571A1/en not_active Abandoned
- 1999-01-22 JP JP11014933A patent/JPH11346212A/en active Pending
- 1999-01-29 EP EP99440012A patent/EP0935361A2/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11346212A (en) | 1999-12-14 |
| DE19804425A1 (en) | 1999-08-12 |
| EP0935361A2 (en) | 1999-08-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20030120 |