CN101197852A - High-isolation multi-plexer circuit apparatus used for coaxial cable multimedia circuit - Google Patents
High-isolation multi-plexer circuit apparatus used for coaxial cable multimedia circuit Download PDFInfo
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- CN101197852A CN101197852A CNA2006101618810A CN200610161881A CN101197852A CN 101197852 A CN101197852 A CN 101197852A CN A2006101618810 A CNA2006101618810 A CN A2006101618810A CN 200610161881 A CN200610161881 A CN 200610161881A CN 101197852 A CN101197852 A CN 101197852A
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Abstract
The present invention relates to a high-isolation multiplexer circuit device for coaxial cable multimedia network, which is arranged between an input end and an output end, and comprises a first adaptation unit and a second adaptation unit. The first adaptation unit is provided with a first high-pass filter close to the input end, as well as a first low-pass filter serially connected with the high-pass filter. The second adaptation unit is in parallel connection with the first adaptation unit, and is provided with a second low-pass filter close to the input end, as well as a second high-pass filter serially connected with the second low-pass filter. By means of the mutual coordination of the first high-pass filter and the second low-pass filter, the present invention ensures that signals passing the first adaptation unit and the second adaptation unit can be effectively separated, can increase isolation, effectively improves signal transmission quality, and provides the operation stability of equipment used in collocation.
Description
Technical field
The present invention relates to a kind of duplexer circuit device, particularly relate to a kind of multiplexer circuit apparatus that is used on the coaxial cable multimedia networking and has high-isolation.
Background technology
For many years, the Ethernet cable is that (numeral is a numerical digit to numeral herein always, below all be called numeral) the main wiring solution of family, utilize it can transmit audio frequency, video and numerical data at home between each room, even connect whole dwelling house audio system to all facilities such as family's automation and safety systems.
Yet Ethernet is not optimal selection, because the Ethernet cable is installed in the dwelling house of having built, needs through walls burrowing to destroy the hardware structure, and this measure is more difficult more than building new house sometimes, and cost is higher.In addition, the cable installation requirement qualified installation person of Ethernet, general water power wiring workman can't be competent at.
Therefore, just have the dealer to begin to support and create the new mode of digital home's infrastructure, they mainly are to utilize the circuit main line that all exists in each family almost, and just new-type building still is electric wire and the coaxial wire that old building all has.Difference according to used circuit main line, this new-type digital home's connection technology mainly is to be divided into family's electric line network (hereinafter to be referred as HomePlug AV) and coaxial cable multimedia networking (hereinafter to be referred as MoCA) two kinds of technology, be respectively that two kinds of different technical organizations are formulated and promoted by power line networking alliance (HomePlug Powerline Alliance) of family and multimedia over Coax Alliance (Multimediaover Coax Alliance).
Briefly, HomePlug AV be for can utilize common cable, the power line of Utilities Electric Co. for example, and power line may be the most general cable in the general family, as long as use this power line just can in general family, provide digital frequency range, do not need additionally to install the Ethernet cable.And the technology of MoCA, basically with to set up a HomePlug networking identical, but wire rod but is to use coaxial cable, mainly is to be used for the video of a plurality of high image quality is sent to another room from a room.The MoCA networking will be installed at present in the family only to be needed simply MoCA multiplexer (or claiming adapter) to be connected with coaxial cable, just can provide telephone service and computer on a coaxial cable (is computer, below all be called computer) data networking, it also provides enough frequency ranges simultaneously, carry out the needs of far-end control to satisfy data to video (be data, below all be called data) stream.
See also shown in Figure 1, be the multiplexer 1 circuit arrangement schematic diagram that is used for the coaxial cable multimedia networking at present, general multiplexer 1 has an input 11, one first high pass filter 12, one first low pass filter 13, one second high pass filter 14, one second low pass filter 15, and two outputs 16.Wherein this input 11 is 75 Ω with the impedance of this two output 16, and these first high pass filter, 12 these first low pass filters 13 of series connection, these second high pass filter, 14 these second low pass filters 15 of series connection.
Please cooperate consult shown in Figure 2, for the frequency noise that measures this multiplexer 1 gained than waveform schematic diagram.By among the figure as can be known, noise level decibel (dB) wavy line presents the aspect of dipping and heaving in the scope of frequency 0-3.0 * 109 hertz (GHz), at 1125MHz-1525MHz, and requirement can have preferable signal isolation in these two frequency ranges of 975MHz-1025MHz with the specification major requirement of MoCA.
The wave band of 975MHz-1525MHz among the detailed survey figure, this noise scope from-35dB to-105dB, therefore can judge two outputs 16 of this multiplexer 1, its isolation (Isolation) is not good, mainly be because signal is after input 11 enters this multiplexer 1, just be divided into two and enter this first high pass filter 12 and this second high pass filter 14 simultaneously, first, two high pass filters 12, under 14 the interaction, the signal overlapping phenomenon is serious, thereby influence provides the signal definition of telephone service and computer data networking on same coaxial cable, not only frequency range can't effectively utilize, even the data flow that influences videl signal and carry out far-end control.
This shows that the above-mentioned existing multiplexer circuit apparatus that is used for the coaxial cable multimedia networking obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking of new structure, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that the above-mentioned existing multiplexer circuit apparatus that is used for the coaxial cable multimedia networking exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of novel high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking, can improve the general existing multiplexer circuit apparatus that is used for the coaxial cable multimedia networking, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
The objective of the invention is to, overcome the defective that the existing multiplexer circuit apparatus that is used for the coaxial cable multimedia networking exists, and provide a kind of high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking of new structure, technical problem to be solved is to make it that a kind of coaxial cable multimedia networking that is used for is provided, and has filtering compensation and can effectively block the high-isolation multiplexer circuit apparatus of noise.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.A kind of high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking according to the present invention's proposition, be to be arranged between an input and the output, this high-isolation multiplexer circuit apparatus comprises one first adaptation unit, reach second adaptation unit in parallel with this first adaptation unit, this first adaptation unit has one first high pass filter, and first low pass filter of connecting with this first high pass filter, this second adaptation unit has one second low pass filter, and second high pass filter of connecting with this second low pass filter, wherein: this first high pass filter is relative to this second high pass filter this input than this first low pass filter with this second low pass filter.
The object of the invention to solve the technical problems can also be applied to the following technical measures to achieve further.The aforesaid high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking, the resistance value of wherein said input and this output is between 70～80 ohm.
The present invention compared with prior art has tangible advantage and beneficial effect.As known from the above, in order to achieve the above object, the invention provides a kind of high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking, be to be arranged between an input and the output, this high-isolation multiplexer circuit apparatus comprises one first adaptation unit, and one second adaptation unit.This first adaptation unit has one first high pass filter, and first low pass filter of connecting with this first high pass filter.This second adaptation unit is in parallel with this first adaptation unit, and has one second low pass filter, and second high pass filter of connecting with this second low pass filter, wherein, this first high pass filter is relative to this second high pass filter this input than this first low pass filter with this second low pass filter.
By technique scheme, the high-isolation multiplexer circuit apparatus that the present invention is used for the coaxial cable multimedia networking has following advantage and beneficial effect at least: effect of the present invention is, this first, second adaptation unit is near the place of signal input end, be to cooperate with this first high pass filter and this second low pass filter, and the signal by this first, second adaptation unit can effectively be separated, and can increase isolation, effectively improve the quality of signal transmission, the operation stability of collocation use equipment is provided.
In sum, the invention relates to a kind of high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking, is to be arranged between an input and the output, and comprises one first adaptation unit, and one second adaptation unit.This first adaptation unit has first high pass filter near this input, and first low pass filter of connecting with this first high pass filter.This second adaptation unit is in parallel with this first adaptation unit, and has second low pass filter near this input, and second high pass filter of connecting with this second low pass filter.The present invention works in coordination by this first high pass filter and this second low pass filter, and the signal by this first, second adaptation unit can effectively be separated, and can increase isolation, and effectively improve the quality of signal transmission, the operation stability of collocation use equipment is provided.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on product structure or function, obvious improvement is arranged technically, and produced handy and practical effect, and the more existing multiplexer circuit apparatus that is used for the coaxial cable multimedia networking has the outstanding effect of enhancement, thereby being suitable for practicality more, and having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 one is used for the multiplexer circuit apparatus schematic diagram at coaxial cable multimedia networking at present.
Fig. 2 measures the frequency noise of this multiplexer gained than waveform schematic diagram among Fig. 1.
Fig. 3 is the circuit diagram of preferred embodiment that an explanation the present invention is used for the high-isolation multiplexer circuit apparatus at coaxial cable multimedia networking.
Fig. 4 measures the frequency noise of this preferred embodiment gained than waveform schematic diagram among Fig. 3.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of high-isolation multiplexer circuit apparatus, structure, feature and the effect thereof that are used for the coaxial cable multimedia networking that foundation the present invention is proposed are elaborated.
See also shown in Figure 3, be used for the preferred embodiment of the high-isolation multiplexer circuit apparatus 5 at coaxial cable multimedia networking for the present invention, this high-isolation multiplexer circuit apparatus 5, be to be arranged between an input 3 and the output 4, and include one first adaptation unit 51, and second adaptation unit 52 in parallel with this first adaptation unit 51.
At first, be noted that before this preferred embodiment is elaborated this section only introduce connection relationship and the effect between foregoing circuit, repeat after holding as for the action between circuit element.
This first adaptation unit 51 electrically connects with this input 3 and this output 4 respectively, and has one first high pass filter 511, and first low pass filter 512 of connecting with this first high pass filter 511.
This second adaptation unit 52, in parallel with this first adaptation unit 51, electrically connect with this input 3 and this output 4 respectively too, and have one second low pass filter 521, and second high pass filter 522 of connecting with this second low pass filter 521.Wherein, the resistance value of this input 3 and output 4 is between 70～80 ohm, and this preferred embodiment is to be that example explains with 75 Ω.This first high pass filter 511 is relative to this input 3 with this second low pass filter 521, and this first low pass filter 512 and this second high pass filter 522 are then relatively near this output 4.
By the place of this first, second adaptation unit 51,52 near signal input end 3, be to work in coordination with first high pass filter 511 and this second low pass filter 521, and the signal by this first, second adaptation unit 51,52 can effectively be separated, and can increase isolation, effectively improve the quality of signal transmission, provide collocation to use the operation stability of electric equipment.
Please cooperate consult shown in Figure 4, for the frequency noise that measures this preferred embodiment gained than waveform schematic diagram.As seen from the figure, the wavy line of noise scope decibel (dB) is the wave form varies of isolation in the frequency range of 0-3.0 * 109 hertz (GHz) of this preferred embodiment.At 1125MHz-1525MHz, and requirement can have preferable signal isolation in these two frequency ranges of 975MHz-1025MHz with the main demand of specification of coaxial cable multimedia networking (MoCA).
According to above-mentioned explanation, this high-isolation multiplexer circuit apparatus 5 is effectively intercepted the frequency noise of data flow and the mutual interference of voice flow phase.So, please cooperate the frequency band of looking back among Fig. 2 and detailed survey Fig. 4 from 975MHz to 1525MHz hereinafter, this noise scope dB value is between-the 50dB from-35dB, therefore can judge that the present invention is used for the high-isolation multiplexer circuit apparatus 5 at coaxial cable multimedia networking, its isolation effect is better than general multiplexer 1 really.
This start because of in signal after input 3 enters this high-isolation multiplexer circuit apparatus 5, just be divided into two and enter this first high pass filter 511 and this second low pass filter 521 simultaneously, at first high pass filter 511, under the interaction of second low pass filter 521, the signal major part of higher frequency band can derive in this first adaptation unit 51, and can in this second adaptation unit 52, derive than the signal major part of low-frequency range, this is first years old, second adaptation unit 51, signal overlapping phenomenon between 52 significantly reduces, the noise fluctuation range has only 15dB, therefore can be reduced in the signal noise that telephone service and computer data networking are provided on the same coaxial cable, frequency range is effectively used, and does not influence videl signal and carry out the definition of the data flow of far-end control.
Conclude above-mentioned, the present invention is used for the high-isolation multiplexer circuit apparatus 5 at coaxial cable multimedia networking, technical characterictic by aforementioned announcement, this is first years old, second adaptation unit 51,52 places near signal input end, be to work in coordination with this first high pass filter 511 and this second low pass filter 521, and make by this first, second adaptation unit 51,52 signal can effectively separate, and can increase isolation, not only be not easy to influence the signal definition between the different outputs 4, but also can effectively block the situation that noise disturbs, effectively improve the quality of signal transmission, provide the operation stability of collocation use equipment, so can reach purpose of the present invention and effect really.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (2)
1. high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking, be to be arranged between an input and the output, this high-isolation multiplexer circuit apparatus comprises one first adaptation unit, reach second adaptation unit in parallel with this first adaptation unit, this first adaptation unit has one first high pass filter, and first low pass filter of connecting with this first high pass filter, this second adaptation unit has one second low pass filter, and second high pass filter of connecting with this second low pass filter, it is characterized in that:
This first high pass filter is relative to this second high pass filter this input than this first low pass filter with this second low pass filter.
2. the high-isolation multiplexer circuit apparatus that is used for the coaxial cable multimedia networking as claimed in claim 1, the resistance value that it is characterized in that wherein said input and this output is between 70～80 ohm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101618810A CN101197852A (en) | 2006-12-05 | 2006-12-05 | High-isolation multi-plexer circuit apparatus used for coaxial cable multimedia circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101618810A CN101197852A (en) | 2006-12-05 | 2006-12-05 | High-isolation multi-plexer circuit apparatus used for coaxial cable multimedia circuit |
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| CN101197852A true CN101197852A (en) | 2008-06-11 |
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| CNA2006101618810A Pending CN101197852A (en) | 2006-12-05 | 2006-12-05 | High-isolation multi-plexer circuit apparatus used for coaxial cable multimedia circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651771B (en) * | 2008-08-12 | 2012-04-18 | 永硕联合国际股份有限公司 | Electronic device supporting Multimedia over Coax Alliance standards |
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2006
- 2006-12-05 CN CNA2006101618810A patent/CN101197852A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651771B (en) * | 2008-08-12 | 2012-04-18 | 永硕联合国际股份有限公司 | Electronic device supporting Multimedia over Coax Alliance standards |
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Open date: 20080611 |