CN1330835A - Telecommunication system and connection device for use in it - Google Patents
Telecommunication system and connection device for use in it Download PDFInfo
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- CN1330835A CN1330835A CN 99814324 CN99814324A CN1330835A CN 1330835 A CN1330835 A CN 1330835A CN 99814324 CN99814324 CN 99814324 CN 99814324 A CN99814324 A CN 99814324A CN 1330835 A CN1330835 A CN 1330835A
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6168—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Transmitters (AREA)
Abstract
A telecommunication system comprising first telecommunication means (11, 12) capable of receiving a first telecommunication signal in a first frequency range and second telecommunication means (21) capable of transmitting a second telecommunication signal in a second frequency range, and a telecommunication network (1). The first and second telecommunication means (11, 12, 21) are coupled to the telecommunication network (1) via the connection device (40). The connection device (40) comprises separate signal paths (44, 45) to an input (43) and an output (42) thereof, which are coupled to a common connection (41) intended for the telecommunication network (1) via separation means (460). The first telecommunication means (11, 12) are herein coupled to the output (42), while the second telecommunication means (21) are connected to the input (43). The separation means (460) are herein capable of leading the first telecommunication signal at least almost exclusively over a first signal path (44) between the output (42) and the common connection (41) and the second telecommunication signal at least almost exclusively over a second signal path (45) between the common connection (41) and the input (43).
Description
The present invention relates to a kind of first telecommunication installation that comprises first telecommunication signal that can receive the first frequency scope, can launch second telecommunication installation of second telecommunication signal of second frequency scope and the telecommunication system of a telecommunications network.The invention further relates to a kind of first telecommunication installation of first telecommunication signal that is used for to receive the first frequency scope and second telecommunication installation of second telecommunication signal that can launch the second frequency scope and be coupled to the connection device that a single telecommunications is connected together, connection device comprises an output that is used for first telecommunication installation, an input that is used for second telecommunication installation is used for the shared connection that telecommunications is connected with one.
Telecommunications service are normally undertaken by private telecommunication network.Its main application is that the speech that is used to be called the public telephone network of PSTN (public switched telephone network) transmits, and the exchanges data between the computer, has the data networks of many special designs for this purpose available.Video and sound signal are generally propagated by ether, and in many industrialized countries, propagate in the cable television network on being built in the senior transmission medium of glass fibre and coaxial cable and so on more and more.Wish to utilize the user of all these services must have connection device according to the respective amount of its own selection.
The computerization trend of society causes existing telecommunications service further to enlarge, or to cause particularly be the appearance of more and more newer telecommunications service of purpose with the private user.In addition, the interactivity of these services strengthens day by day, wherein preferably uses high data transmission bauds sometimes, so that can transmit bulk information to the user in acceptable time.Their example is remote measurement, forms such as pay-per-view, particularly the Internet, and owing to increasing of multimedia application, the Internet needs higher data transmission bauds especially.
Owing to recognize that the largest data transfer speed of public telephone network in this interactive services and available bandwidth are limiting factors day by day, therefore seeking the alternate network that is used for the data transmission.A kind of possible candidate's net is the widely used cable television network of having laid in present many industrialized countries.The difference of this network and public telephone network is that it is based on direct connecting terminal user's senior transmission medium, and the terminal use comprises that the high glass fiber from the higher part of network is connected to the users at different levels of the senior coaxial cable that is used for user's connection.This connection provides the bandwidth that enlarges markedly, and allows than the user by the public telephone network higher transmission speed of simple twisting copper cash to connecting.In addition, in this high-level network, can more easily guarantee the integrality of digital signal.
But cable television network mainly is the issue that is designed for radio and TV programme, and this occurs on the direction from the network to user.Do not predict from the user to the business of returning that is positioned at network middle and high end part in beginning, second telecommunication signal of for example in aforementioned part, mentioning from second telecommunication installation, but in current telecommunications, more and more need.In order to make the latter become possibility, constantly upgrading existing cable television network, make it be suitable for two-way services.These improve in fact comprise with network in existing amplifier the bypass filter and the bypass amplifier that can send inverse signal is set in parallel.Here, these inverse signals are in not by the radio that will distribute and television channel and take, and the less relatively low frequency range that is subjected to the signal damping puzzlement.Network improves the problem that the back produces, not only can be at the Return-ing direction transmitting data, and be also can freely enter network now at the noise that is called ingress noise that the terminal use produces, and send with the amplification form.Ingress noise mainly originates from the stube cable that is used to connect the equipment that wherein exists in the family.These cables have electromagnetic interference possible in the intercept family and they are input to the effect of the antenna in the cable network.Certainly, this latter do not wish, particularly since it numerical data must transmit therein for the responsive relatively low-frequency band of noise in.
Another kind of situation is, along with the two-way use of cable television network, it no longer only is the receiving equipment that is present in terminal use's radio or television receiver and so on, and is the transmitter of emission inverse signal.If just simply all devices concentrated area is connected to the existing connection device of cable television network, the inverse signal of so this transmitter will also flow into receiving equipment inevitably, and may disturb the signal of communication that sends to it.The typical emission equipment of cable television network generally has the optimum adjustment that transmits, and needn't consider its influence to the miscellaneous equipment that may also exist.Here normally used output level arrives 80-115dB μ V.Because TV and radio signal are generally suitable for the fiduciary level of 60-80dB μ V, so this will disturb to the upset of radio that causes receiving and TV programme rapidly.
Purpose of the present invention particularly will provide a kind of telecommunication system, uses one of telecommunications network to be connected with can sharing of type described in a kind of aforementioned part, can eliminate the connection device of the problems referred to above simultaneously at least most ofly.
In order to achieve the above object, according to the present invention, the connection device of type is characterised in that described in the aforementioned part, connection device is included in the signal path of the isolation of input and output side, they are coupled to the shared connection that telecommunications connects through spacer assembly, and be, spacer assembly can at least almost guide first telecommunication signal by first signal path between output and shared the connection exclusively, and at least almost guides second telecommunication signal by the secondary signal path between shared connection and the input exclusively.The present invention is based on such understanding,, can prevent that phase mutual interference and noise from flowing in the network by in effective isolation of user side to the signal path of descending and uplink communication business.In connection device according to the present invention, this means that the upward signal business from second telecommunication installation will be guided fully by the secondary signal path, estimate to be used for the downstream signal business of first telecommunication installation then through first signal path.Therefore, two Business Streams shield each other, thereby have prevented the phase mutual interference.
A specific embodiments according to connection device of the present invention is characterised in that, spacer assembly comprises and can guide two telecommunication signals by their frequency filtering apparatuses of signal path separately.The business on the both direction strictly transmits in different frequency ranges at least basically in the network by making, and the isolation of the anticipation of two signal paths can be provided in fairly simple mode with this spacer assembly.Be characterised in that according to the more special of this specific embodiments of the present invention, the frequency filtering apparatus comprises that has a low pass filter that is higher than one threshold value lower in first and second frequency ranges, and one has the high pass filter that is lower than one threshold value higher in first and second frequency ranges.The uplink service that comprises the second communication signal preferably occurs in lower frequency range, and higher frequency range is distributed to downlink business, for example first signal of communication.Lower frequency band will still can be used for the business of returning in many existing cable television networks, thereby uplink service can occur in wherein.One of them additional advantage is less in the low frequency signals damping, thereby only needs to be provided with in the return path of network amplifier still less or littler.
Isolate also to provide according to two signal paths in the connection device of the present invention basic strict at least and reduce noise and other greatly and do not wish that signal flow goes into the possibility of network.For this purpose, a preferred embodiment according to connection device of the present invention is characterised in that, the signal path of first telecommunication installation comprises the rectifier unit that the signal of major part at least on the signal path rightabout that can suppress with first telecommunication signal transmits.Because rectifier unit suppresses each signal flow on the up direction in first signal path widely, has prevented that effectively ingress noise from entering network through first signal path.Because occur in fully in the secondary signal path of isolation from returning of the hope of second telecommunication installation is professional, it can not interrupted by rectifier unit.In this respect, have a kind of feature according to a specific embodiment of connection device of the present invention, that is, rectifying device comprises an operational amplifier.
In order to carry out the interactive services of the Internet, phone and pay-per-view and so on, be characterised in that according to another embodiment of connection device of the present invention equipment comprises a plurality of outputs, at least one will offer second telecommunication installation in them.Utilize this embodiment, the signal of going out from second telecommunication installation will strictly transmit along the secondary signal path at least basically, and entering signal then strictly transmits by first signal path at least basically.This provides the two-way services selection for second telecommunication installation, has kept advantage of the present invention simultaneously.Here, transmission of Information occurs in the second frequency scope, and receives information in the first frequency scope.As a result, the present invention makes the full duplex two-way services become possibility, does not enter and the disturbances of the signal of going out and can not produce.Owing to will receive information more information usually than emission, therefore the viewpoint of bigger bandwidth is arranged from higher frequency range, the first frequency scope higher than second frequency scope selected in suggestion.
Feature according to another preferred embodiment of the present invention is to provide attenuating device in the signal path between first output and second output.Thereby Signal Spacing not only acts between the input and output of equipment, and acts between two outputs.As a result, utilize attenuating device can suppress the interference that outputs to an adjacent output from effectively, and needn't damage useful signal.In this respect, the feature according to another specific embodiments of connection device of the present invention is that attenuating device comprises at least one directional coupler.This coupler has an input and at least two outputs, and one of them output only has very little decay, and another has very big decay.By being arranged on, this element can realize the useful signal isolation between the continuous output.
In another preferred embodiment, connection device according to the present invention has following feature: the output of second telecommunication system is insulated to direct current.Thereby, in through the DC component of described connection in the signal that it provides, realized the outage of second telecommunication installation.In this case, come automatic network or can not destroy second telecommunication installation from the possible overvoltage of first telecommunication installation.If first telecommunication installation comprise the chassis some the time be in old-fashioned television receiver under the high voltage, this particular importance.If in this case, the network in the television receiver connects does not have suitable ground connection, this preferred embodiment can avoid described high voltage that second telecommunication installation is caused harmful result.
In addition, in order to adapt to current telecommunications service, and can adapt to telecommunications service in the future, the telecommunication system according to the present invention of type described in the aforementioned part has following feature: first and second telecommunication installations are coupled to telecommunications network through above-mentioned special-purpose connection device according to the present invention.Telecommunications network can be any existing or network in the future in principle, but in a specific embodiments according to the present invention, comprise that a preparation is used to issue the cable television network of radio and/or TV programme, wherein first telecommunication installation comprises a radio and/or television receiver.As already mentioned, such network generally provides a kind of senior infrastructure that allows the high amount of traffic amount and have the brilliance of low distortion.
A specific embodiments according to telecommunication system of the present invention is characterised in that second telecommunication installation comprises that one side is coupled to an input and an output of connection device, and is coupled to the conversion equipment of digital the 3rd telecommunication installation on the other hand.Conversion equipment can convert the digital signal from the 3rd telecommunication installation to the signal of communication with the telecommunications network compatibility, or carries out opposite conversion.Thereby, can be included in digital the 3rd telecommunication installation in the telecommunication system, even network does not allow directly to do like this, for example,, or used different signal frequencies because it is analog.The example of this digital telecommunication device is a computer, and digital telephone equipment and various preparation are used for the equipment of many telemetry and telecommand forms.
General hope can be used the available telecommunication installation in market in telecommunication system, and needn't change telecommunication installation.Thereby using system more at large, and seldom noisy danger in the equipment that will connect.For this consideration, a specific embodiments according to telecommunication system of the present invention has following feature: a gateway unit is coupling between the 3rd telecommunication installation and the conversion equipment, and gateway unit has on the one hand or not relevant with one and connection that be suitable for the interface of the 3rd telecommunication installation type specially, is applicable on the other hand with conversion equipment and communicates by letter.In this case, gateway unit provide the 3rd telecommunication installation on the one hand and conversion equipment be the adjusting that may need between on the other hand, and also connect for the 3rd telecommunication installation provides a standard.Therefore, the 3rd telecommunication installation itself does not generally need further to transform to be attached in the system.
In this respect, another specific embodiments of telecommunication system is characterised in that, gateway unit is suitable for the connection of the 3rd telecommunication installation, and the 3rd telecommunication installation is selected from the network or the group of computer, analog or digital telephone device and the device by standard RS232 serial port communications independently.The interface that gateway unit can be used for all these connections and may need with its most comprehensive form, thus various standard telecommunication apparatus can directly be connected.In order to save special purpose interface, another embodiment has following feature: gateway unit can use a kind of integrated telecom agreement of different telecommunications service that allows to communicate by letter with conversion equipment, thereby when this situation occurring, can the signal of dissimilar telecommunication apparatus be sent to conversion equipment, and need not the intervention of special purpose interface by gateway unit.
Have following feature according to still another embodiment of the invention: the 3rd telecommunication installation is coupled to a local digital telecommunications network, and the local digital telecommunications network is coupled to the input and the output of connection device again through conversion equipment.Increase this digital network and make it possible to provide major network unsupported digital protocol of possibility and digital telecommunication service.Conversion equipment provides the conversion of two needs between the network.Thereby obtained a hybrid telecommunication system, this system on the one hand based on having because the present invention and can carry out the major network of the senior infrastructure of two-way signaling business, on the other hand based on the local network of the various telecommunications service of wishing in the user side support.
Further specify the present invention below with reference to an embodiment and relevant accompanying drawing.In the accompanying drawings:
Fig. 1 shows the schematic diagram of telecommunication system according to an embodiment of the invention;
Fig. 2 shows the schematic diagram according to first embodiment of connection device of the present invention that uses in the telecommunication system of Fig. 1; With
Fig. 3 shows the schematic diagram according to second embodiment of connection device of the present invention that can use in the telecommunication system of Fig. 1.
Should be pointed out that accompanying drawing is pure schematic, and do not draw in proportion.Some sizes have been exaggerated in the accompanying drawings especially.For the sake of clarity, identical parts have used identical reference number in each figure.
The telecommunication system of Fig. 1 comprises an existing cable television network 1 that is mainly used in radio and TV programme transmission and issue.What be coupled to this net is first telecommunication installation of radio receiver 11 and television receiver 12 forms.For this purpose, what be positioned at user side is a shared connection 2 in center that is used for net 1, branches out a special combination that is used for radio and TV from shared connection 2 and is connected 3.It generally is signal in the discrete frequency bands of 5MHz-862MHz scope that this network is designed for issue usually, and therefore, radio and television receiver are applicable to first telecommunication signal in the frequency range that receives in these limits.For example, the frequency that has taken the 87.5-108MHz scope is used to issue radio programming, and the 115-862MHz range assignment is used for TV programme.
Therefore, the following zone of 87.5MHz remains freely, and is used to make the business of returning to occur in wherein more and more, that is, from the user to the signal service that is positioned at the higher part of network.Ask under the condition this, telecommunication installation also is arranged on user side, for example conversion equipment 21 as shown in FIG., decoder 34, computer 31, digital telephone mobile phone and/or analog telephone sets 33, they can send second telecommunication signal, i.e. inverse signal in the second frequency scope.Therefore, return the paths that many interactive telecommunication services by net 1 have been opened in professional selection, but also brought the danger that to send into network from the noise that is commonly referred to ingress noise and other interference of user.In addition, if the inverse signal and first telecommunication signal all are input to receiving equipment, the inverse signal that produces at user side may be disturbed first telecommunication signal of receiving equipment so.
For fear of this situation,, reception first telecommunication installation 11,12 and emission telecommunication installation 21,31,32,33,34 are connected through connection device 40 according to the present invention as more detailed demonstration the among Fig. 2.Connection device 40 comprises 41, one of shared connections that is connected to net 1 input to emission second telecommunication installation 21 of the output 42 that receives first telecommunication installation 11,12 and an optional existence.According to the present invention, jockey 40 comprises that isolation signals path 44 and 45, two paths that branch is clipped to output 42 and input 43 are coupled to shared connection through spacer assemblys 460.Spacer assembly 460 comprises a high pass filter 461, make the only conducting on first signal path 44 of first signal of communication by high pass filter 461, high pass filter 461 and one impel the second communication signal to combine by the low pass filter 462 in secondary signal path 45.In this case, two filters are integrated into a single component that is called the diplex filter greater than-60dB, although this itself is not a substantial portion of the present invention.
Because two signals are strictly followed the signal path of itself at least basically, thereby have effectively prevented two interference between signals.This means especially, can not appear at the output 42 of the connection device of the receiving equipment 11,12 that has been coupled through the inverse signal of secondary signal path 45 its transmission of continuation from input 43.Therefore, the output that can in rational limit, improve second telecommunication installation, and not having the danger that radio and TV programme are disturbed, radio and TV programme are strictly to be provided to radio and television receiver through first signal path 44 at least basically.Therefore, can freely optimize the output of emission telecommunication installation,, and need not the signal quality that receives the telecommunication installation reception is made concessions so that obtain high-quality output signal.
The analog signal service downlinks is only used first signal path 44, only pass through two signal paths 44 in such linkage unit 40 in secondary signal path 45 with digital signal service uplink in the network, 45 isolation provides and has arranged rectifier unit 47 to suppress the choice of any business on the rightabout in first signal path 44 in first signal path.Its advantage is that the possible noise that is called ingress noise that produces at user side no longer includes the chance that arrives net 1 through this signal path 44.In the present embodiment as rectifier unit be an operational amplifier that has greater than the decay of-70dB, it has been found in practice that it is enough to suppress the overwhelming majority of ingress noise in the net 1.The return path that comprises filter 460 45 on the other hand has and only is not more than-decay of 1dB, still can carry out along this side thereby return business.Operational amplifier 47 is had an additional advantage as rectifier unit, that is, the gain compensation of its about 6dB the output 42 of equipment is divided into the decay of about 5.6dB that the dispenser 48 of three branches causes.Like this, the user had can arrange three and connected 42,42 ', 42 " and, to receive downstream signal business from net 1.During these connect at least one connects 42 and " insulate for direct current, wherein combine a capacitor 49 in signal path.This connect the other output 42,42 normally be specifically designed to and be coupled to unit 40 ' miscellaneous equipment, for example, the equipment that first telecommunication installation 11,12 is such, the so equipment of senior (height) voltage-sensitive of electric insulation.Therefore, connecting 42 " provides the possible overvoltage of this miscellaneous equipment and the protection of imperfect earth.Owing in secondary signal path 45, combine a capacitor 49 equally, thereby this protection also is applied to the input 43 of equipment.
Be coupled to the input 43 and the output 42 of the protection like this of unit 40 " be second telecommunication installation 21; second telecommunication installation 21 comprises the conversion equipment of the modulator-demodulator unit form that abbreviates modulator-demodulator as in the present embodiment, and this conversion equipment is specially adapted for the cable television network as the net 1 of present embodiment.Modulator-demodulator can convert the digital signal from the equipment that is connected thereto to and be suitable for the signal that transmits and carry out opposite conversion in net 1.For the received signal business that occurs in the first frequency scope from net 1, modulator-demodulator 21 has an output 42 that is coupled to unit 40 for this purpose " input 211; and the business of returning in the second frequency scope is provided to output 212, and is conducted through its special-purpose signal path 45 through the input 43 of linkage unit 40.Modulator-demodulator can provide the specific modulation frequency of the spacer assembly 460 that is suitable in the linkage unit 40 for two routes.At opposite side, modulator-demodulator 21 has one and is used for the computer 31 shown in the picture present embodiment, the combined digital I/O 213 that is connected of digital the 3rd telecommunication installation of phone 32,33 and decoder 34 and so on.
In the present embodiment, the connection of these the 3rd telecommunication installations 31....34 takes place through gateway unit 50.On the one hand, gateway unit has and has or do not have necessary relevant interface 51...54, and is adjusted to the connection of the particular type of the 3rd telecommunication installation, has a common port 55 of communicating by letter with modulator-demodulator 21 on the other hand.Like this, in the present embodiment, gateway unit 50 has a network with the network interface combination commonly used of the telecommunications network 30 (LAN) of another computer 31 and is connected 51, one connects 52 with the DECT that is used to be connected based on the DECT combination of interfaces of the digital mobile phone 32 of the cordless telephone of DECT agreement, a connection 53 that has the built-in A/D converter interface that is used for habitual analog telephone equipment 33, with one be used for, for example, the standard RS232 interface that remote measurement is used, a decoder 34 in this case wherein has been coupled.Here, decoder 34 carries out digital communication through the RS232 and the net 1 of gateway units 50, is used to encrypt the exchange with confirmation, and on the other hand, send from the analog program data of net 1 and be directly connected to the output 42 of connection device for this purpose in mode commonly used.
If desired, will internally convert a kind of shared protocol to from the signal of all these equipment, and for this purpose, select Internet Protocol (TCP/IP) in the present embodiment, itself has supported the integrated of multiple telecommunications service this agreement.Intercommunication mutually between gateway unit and the modulator-demodulator 21 occurs on the basis of this agreement.Therefore, the 3rd telecommunication installation 31..34 needn't be transformed, so that be used in combination with modulator-demodulator 21 and net 1, and vice-versa, needn't, or few consideration, the user is with the type of the equipment 31..34 of employing in net 1.Each will handle necessary for this purpose a plurality of conversions or adjusting connection device 40, modulator-demodulator 21 and gateway unit 50.In addition, also support to allow data to transmit in the computer network 30 and the Internet Protocol (TCP/IP) of telephone service, thereby also can carry out telephone service through the input that computer network 30 rather than process are specifically designed to the gateway unit 50 of this purpose.
Schematically show second embodiment among Fig. 3 according to connection device of the present invention.This embodiment haply with Fig. 1 and Fig. 2 in identical.Connection device has one and is used for the shared connection 41 that telecommunications connects, and here also is a CATV net, also have in addition one isolate input 43 and a plurality of separately output that transmits and receives telecommunication installation 42,42 of being used to be coupled ', 42 ".The spacer assembly of diplex filter 460 forms make shared connection 43 respectively with input 41 and output 42,42 ', 42 " between signal path isolate mutually.Identical with first embodiment, in this embodiment, this diplex filter provide a first frequency scope that only is used for 47-862MHz signal connect 43 with output 42,42 ', 42 " between first signal path, and connect 43 with input 41 between the secondary signal path in; in the present embodiment; because the result of filter 460 only can transmit the signal in the second frequency scope of about 5-30MHz.Here, isolation amount arrival-6dB still, in practice, can select higher or lower as required mutually.Low pass filter 46 with about 50MHz limiting frequency provides the additional inhibition to the high frequency component signal in the signal path that leads to input 41 in the present embodiment.
Arrive the output 42,42 ', 42 of equipment " first signal path in operational amplifier 47 provide return professional effective inhibition along this signal path spuious.Oneself the stable dc power supply 471 that is provided for that advanced signal handles for operational amplifier 47.Can prevent to a great extent ingress noise is introduced the network that is coupled to connection 43 by amplifier 47.Even in order when power supply 471 breaks down, also to guarantee through equipment 40 from CATV net issue radio and TV programme, be parallel to operational amplifier a bypass circuit 472 is set, and provide one or more relays that often close, when supply unit 471 stopped electric energy being provided, often closing relay provided an open circuit to be connected between input 43 and main output 42.For this purpose, the supply voltage of operational amplifier 461 also is used as the control voltage of this circuit 472.
For fear of described ingress noise with perturbation scheme disturb from other output 42,42 ', 42 " signal of obtaining, in the present embodiment, each output 42,42 ', 42 " between signal path in attenuating device is set.Here attenuating device comprises directional coupler 62,62 ', 62 ", each directional coupler has one does not have or only be-main path of the very little decay of 1dB and wherein in the present embodiment signal be subjected to approximately-branch road of the remarkable much bigger decay of the decay of 10dB.Equipment comprise be used for each output 42,42 ', 42 " attenuator 62,62 ', 62 ", wherein output 42,42 ', 42 " are coupled to its branch road.Attenuator is arranged in the main signal that ends at a terminator terminating junctor 64 continuously, and terminator terminating junctor 64 is suitable for having 75 ohm the signal path of impedance to prevent to reflect.
Operational amplifier 47 has the amplification quantity of about 17dB.This means that one is provided to and connects 43 input signal, suppose by 460 decay of diplex filter approximately-1dB, have the amplification quantity of 16dB during the output of arrival amplifier 47.First directional coupler 61 " provide-attenuation of 10dB, and additional attenuation device 62 provides-additional attenuation of 6dB, therefore, can " take out signal with actual incoming level from first output 42.Decay in the main path of-1dB under each situation, all will cause subsequently output 42 ' the signal of available 5dB level, and finally at the available signal with respect to the 4dB of incoming level of last output 42.For example, the output of these two back can be used for radio, being connected of TV and video equipment, and, if desired, connect the set-top box of relevant telecommunications service, or the like.If wish, can be by " inserting an attenuator and further regulate output level at first output 42.
Although therefore can each output 42,42 ', 42 " can use signal supplied, attenuating device 62,62 ', 62 " guaranteed adjacent output 42,42 ', 42 " between have at least-Signal Spacing of 20dB.Therefore, possible ingress noise and from output 42,42 ', 42 " in any one other interference will in the signal path of another output, be subjected to-decay of 20dB, thereby almost completely be suppressed.In the present embodiment, not only the input 41 of equipment and output 42,42 ', 42 " between caused effective Signal Spacing, and output 42,42 ', 42 " have produced effective Signal Spacing each other.
For example, first output 42 " can be used in combination with input 41, be used at network or by providing a cable modem 21 to connect personal computer.In order to shield this electronics sensitive equipment, giving the connection 41,42 that is used for this purpose " provides the electricity of a pair of capacitor 49 forms to isolate.Therefore, from be connected to other output 42,42 ' in any one the high voltage of television equipment will can not arrive PC equipment so easily.
In a word, the invention provides a kind of general available solution, what be used for all types of telecommunication apparatus and telecommunications network 1 sharedly is connected 2 connection, wherein can realize the high-quality that receives and transmit, maximum possible degree ground stops the phase mutual interference, and the ingress noise from user-to-network is suppressed to minimum degree.
Although only further illustrate the present invention above, should know the example that the present invention is not limited to provide with reference to seldom several embodiment.But opposite, be familiar with those of ordinary skill in the art and can carry out multiple improvement within the scope of the invention and propose various embodiment.Therefore, can be according to the plurality of devices expansion or the restrictive gateway unit that will connect.In addition, the present invention further specifies according to cable television network, therefore be particularly useful for this purpose, but also can be applied to the network of other type, wherein, as result of the present invention, always can between user's uplink and downlink signal service, obtain effective isolation, thereby both can the phase mutual interference.
Claims (18)
1. connection device, being used for that second telecommunication installation of first telecommunication installation that can receive first telecommunication signal in the first frequency scope, second telecommunication signal interior with launching the second frequency scope is coupled to a single telecommunications together is connected, comprise the output that is used for first telecommunication installation, the input that is used for second telecommunication installation, with be used for the shared connection that telecommunications is connected, it is characterized in that, connection device is included in the isolation signals path of input and output, signal path is coupled to the shared connection that telecommunications connects through spacer assembly, with it is characterized in that, it is almost exclusively by first signal path between output and shared the connection at least that spacer assembly can guide first telecommunication signal, and to guide second telecommunication signal be almost exclusively by the secondary signal path between shared connection and the input at least.
2. connection device according to claim 1 is characterized in that, spacer assembly comprises can guide the frequency filtering apparatus of two telecommunication signals by their signal paths separately.
3. connection device according to claim 2, it is characterized in that, the frequency filtering apparatus comprises having the low pass filter that is higher than one threshold value lower in described first and second frequency ranges, and has the high pass filter that is lower than one threshold value higher in described first and second frequency ranges.
4. one or more described connection devices in requiring according to aforesaid right, the signal path that it is characterized in that first telecommunication installation comprise and can suppress the rectifier unit that signal transmits in the opposite direction with the first telecommunication signal side.
5. connection device according to claim 4 is characterized in that rectifier unit comprises an operational amplifier.
6. one or more described connection devices in requiring according to aforesaid right is characterized in that equipment comprises a plurality of outputs, and wherein at least one is given for second telecommunication installation.
7. connection device according to claim 6 is characterized in that, provides attenuating device in the signal path between one first output and one second output.
8. connection device according to claim 7 is characterized in that attenuating device comprises at least one directional coupler.
9. according to the described connection device of claim 6,7 or 8, it is characterized in that, is that the output that is used for second telecommunication installation insulate for direct current at least.
10. telecommunication system, comprise first telecommunication installation that can receive first telecommunication signal in the first frequency scope, can launch second telecommunication installation of second telecommunication signal in the second frequency scope, with a telecommunications network, it is characterized in that one or more described connection devices were coupled to described net during first and second telecommunication installations required by aforesaid right.
11. telecommunication system according to claim 10, it is characterized in that, telecommunications network comprises a cable television network that is given for issue radio and/or TV programme, and it is characterized in that first telecommunication installation comprises a radio receiver and/or a television receiver.
12. according to claim 10 or 11 described telecommunication systems, it is characterized in that, second telecommunication installation comprises the input being coupled to connection device and the conversion equipment of an output, and it is characterized in that digital the 3rd telecommunication installation is coupled to described conversion equipment.
13. telecommunication system according to claim 12 is characterized in that, the 3rd telecommunication installation is coupled to conversion equipment through a gateway unit, and it is characterized in that gateway unit comprises that one is suitable for the interface of the 3rd telecommunication installation type.
14. telecommunication system according to claim 13, it is characterized in that, gateway unit be applicable to from network or computer independently, being connected of the 3rd telecommunication installation that the device that is used for the analog or digital phone and the group that is used for the device by a standard RS232 serial port communications are taken out.
15., it is characterized in that gateway unit can utilize and allow the integrated telecom agreement of different telecommunications service to communicate by letter with conversion equipment according to claim 13 or 14 described telecommunication systems.
16. according to claim 12,13,14 or 15 described telecommunication systems is characterized in that the 3rd telecommunication installation is coupled to another digital telecom network, this another digital telecom network is coupled to the input and output side of connection device through described conversion equipment.
17. telecommunication system according to claim 16 is characterized in that, another digital telecom network is supported the integrated of several telecommunications service.
18. telecommunication system according to claim 17 is characterized in that, described another digital telecom network is supported data service and telephone service.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1010769 | 1998-12-09 | ||
| NL1010769A NL1010769C2 (en) | 1998-12-09 | 1998-12-09 | Telecommunication system and connection device for use therein. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1330835A true CN1330835A (en) | 2002-01-09 |
Family
ID=19768287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99814324 Pending CN1330835A (en) | 1998-12-09 | 1999-12-09 | Telecommunication system and connection device for use in it |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2002532978A (en) |
| CN (1) | CN1330835A (en) |
| AU (1) | AU1896700A (en) |
| GB (1) | GB2363301B (en) |
| NL (1) | NL1010769C2 (en) |
| WO (1) | WO2000035199A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1027547C2 (en) * | 2004-11-19 | 2006-05-22 | Tratec Telecom B V | Communication system. |
| US9698463B2 (en) | 2014-08-29 | 2017-07-04 | John Mezzalingua Associates, LLC | Adjustable power divider and directional coupler |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU692600B2 (en) * | 1994-09-12 | 1998-06-11 | Scientific-Atlanta, Inc. | Cable television apparatus employing two-way communication |
| US5729824A (en) * | 1994-12-09 | 1998-03-17 | Raychem Corporation | Distributed digital loop carriers system using coaxial cable |
| US5805591A (en) * | 1996-02-28 | 1998-09-08 | Ericsson Raynet | Subscriber network interface |
| US6094211A (en) * | 1996-08-15 | 2000-07-25 | Com21, Inc. | TV and data cable system ingress noise blocker |
-
1998
- 1998-12-09 NL NL1010769A patent/NL1010769C2/en not_active IP Right Cessation
-
1999
- 1999-12-09 GB GB0115210A patent/GB2363301B/en not_active Expired - Fee Related
- 1999-12-09 CN CN 99814324 patent/CN1330835A/en active Pending
- 1999-12-09 WO PCT/NL1999/000756 patent/WO2000035199A1/en active Application Filing
- 1999-12-09 AU AU18967/00A patent/AU1896700A/en not_active Abandoned
- 1999-12-09 JP JP2000587536A patent/JP2002532978A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB0115210D0 (en) | 2001-08-15 |
| WO2000035199A1 (en) | 2000-06-15 |
| GB2363301A (en) | 2001-12-12 |
| NL1010769C2 (en) | 2000-06-13 |
| GB2363301B (en) | 2004-02-11 |
| AU1896700A (en) | 2000-06-26 |
| JP2002532978A (en) | 2002-10-02 |
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