CN102821070B - Network receiver and control method thereof - Google Patents
Network receiver and control method thereof Download PDFInfo
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- CN102821070B CN102821070B CN201110154521.9A CN201110154521A CN102821070B CN 102821070 B CN102821070 B CN 102821070B CN 201110154521 A CN201110154521 A CN 201110154521A CN 102821070 B CN102821070 B CN 102821070B
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Abstract
The invention discloses a kind of network receiver and control method thereof, this network receiver includes first, second variable resistor, first, second processing unit and a Circuit tuning.This first, second variable resistor is used for being connected to first, second signal transmssion line by first, second node respectively; This first processing unit receives respectively from first, second signal of this first, second node, and processes to produce one first data to a difference of this first signal and this secondary signal; This second processing unit receives this first signal and this secondary signal, and processes to produce one second data to a summation of this first signal and this secondary signal; This Circuit tuning according to these first data and this second data, to adjust the resistance value of at least one in this first, second variable resistor.
Description
Technical field
The present invention relates to a kind of network receiver, particularly relate to one and meet high resolution multimedia interface (High Definition Multimedia Interface, HDMI) 1.4 editions network receivers of specification and the control methods of network receiver.
Background technology
Up-to-date HDMI1.4 version specification increases high resolution multimedia interface Ethernet back coupling channel (HDMI Ethernet and Audio return Channel newly, HEAC) function, make HDMI can transmit/receiving high definition multimedia interface EtherChannel (HDMI EthernetChannel simultaneously, HEC) network data and information Return Channel (Audio Return Channel, ARC) information data, to simplify network layout complicated in family, and provide single high frequency range and high-quality circuit to transmit complete image, source of sound, Ethernet transmits and realizes network multimedia integrates application.
In the HDMI device possessing HEAC function, the transmission of HEC network data and ARC information data is all undertaken by identical two bars transmission lines, wherein HEC network data is transmitted by difference mode signal (differential mode signal), and ARC information data is then transmitted by common-mode signal (common mode signal).Ideally, the impedance of signal transmssion line as defined in HDMI specification, should be all 50 Ω, as long as therefore the signal subtraction of two bars transmission lines just can be eliminated common-mode signal at receiving terminal, obtains the difference mode signal of HEC network data.But, please refer to the common-mode signal shown in Fig. 1, if two bars transmission line (TX+, TX-) quality being used for transmitting HEC network data and ARC information data are not good, both impedances are variant, or during the impedance mismatch of the impedance of signal transmssion line and receiver, received common-mode signal will be caused to have the situation that amplitude is not identical, and the different phenomenon of this common-mode signal amplitude can cause the generation of difference mode signal, thus has influence on the quality of HEC network data.
Summary of the invention
Therefore, an object of the present invention is the control method providing a kind of network receiver and network receiver, and it can be avoided quality transmission lines not good and have influence on the quality of HEC network data, to solve the above problems.
A kind of network receiver, includes one first variable resistor, is connected to one first signal transmssion line via a first node, and wherein this first signal transmssion line is used for transmission one first signal; One the second adjustable resistance, is connected to a secondary signal transmission line via a Section Point, and wherein this secondary signal transmission line is used for transmission one secondary signal; One first processing unit, is coupled to this first node and this Section Point, obtains a difference according to this first signal and this secondary signal, and processes to produce one first data to this difference; One second processing unit, is coupled to this first node and this Section Point, obtains a summation according to this first signal and this secondary signal, and processes to produce one second data to this summation; And a Circuit tuning, be coupled to this first processing unit and this second processing unit, according to the resistance value of at least one in these first data and this first, second variable resistor of this second data point reuse.
A kind of control method of network receiver, this network receiver includes one first variable resistor and a second adjustable resistance, this first variable resistor is connected to one first signal transmssion line by a first node, and this second adjustable resistance is connected to a secondary signal transmission line by a Section Point, the method includes reception from one first signal of this first node and the secondary signal from this Section Point; Obtain a difference according to this first signal and this secondary signal, and process to produce one first data to this difference; Obtain a summation according to this first signal and this secondary signal, and process to produce one second data to this summation; And according to these first data and this second data, adjust the resistance value of at least one in this first, second variable resistor.
Wherein, these first data and this second data are respectively HEC network data and ARC network data.
Accompanying drawing explanation
The schematic diagram of common-mode signal when Fig. 1 is the impedance mismatch of signal transmssion line.
Fig. 2 is the schematic diagram of the network receiver according to one embodiment of the invention.
Fig. 3 is the schematic diagram of the Circuit tuning according to one embodiment of the invention.
Fig. 4 is the control method of a kind of network receiver according to one embodiment of the invention.
Primary clustering symbol description
200 network receiver 202,204 signal transmssion lines
210,220 processing unit 212 subtracters
222,342 adder 214,224 low pass filters
216,226 analog-digital converter 230 Circuit tunings
240 gain adjusting unit 310 polarity sign unit
320,330 multiplier 340 accumulators
344 delay cell 350 adjustment units
R1, R2 variable resistor R3, R4 impedance
Rx+, Rx-Signal reception node Tx+, Tx-signal output part
400 ~ 408 steps
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the network receiver 200 according to one embodiment of the invention.As shown in Figure 2, network receiver 200 includes two variable resistor R1, R2, two processing unit 210,220, Circuit tuning 230, gain adjusting unit 240, two signal output parts Tx+, Tx-and two Signal reception node R x+, Rx-, wherein processing unit 210 includes subtracter 212, low pass filter 214 and an analog-digital converter 216, and processing unit 220 includes subtracter 222, low pass filter 224 and an analog-digital converter 226.In addition, variable resistor R1, R2 are coupled to signal transmssion line 202,204 respectively by by Signal reception node R x+, Rx-, and wherein the impedance of signal transmssion line 202,204 is respectively R3, R4.
In the present embodiment, network receiver 200 meets HDMI 1.4 editions specifications, there is the ability of reception/transmission HEC network data and ARC information data, wherein, HEC network data uses difference mode signal to transmit on signal transmssion line 202,204, and ARC information data uses common-mode signal to transmit on signal transmssion line 202,204.
As shown in Figure 2, subtracter 212 receives the first signal V1 and secondary signal V2 from receiving node Rx+ and Rx-respectively, first signal V1 and secondary signal V2 is subtracted each other generation one difference, this difference is input to low pass filter 214 and carries out low-pass filtering treatment, after carrying out Analog-digital Converter operation via analog-digital converter 216 again, produce HEC network data D
hEC.Simultaneously, adder 222 in processing unit 220 also receives the first signal V1 and secondary signal V2 from receiving node Rx+ and Rx-respectively, and the first signal V1 is added generation one summation with secondary signal V2, this summation is input to low pass filter 224 and carries out low-pass filtering treatment, operated to carry out Analog-digital Converter by analog-digital converter 226 again, produce ARC information data D
aRC.
As described in prior art, the resistance value of impedance R3, R4 of signal transmssion line 202,204 may not be 50 Ω as HDMI specification defined, therefore, and the HEC network data D that processing unit 210 exports
hECmay be subject to signal transmssion line 202,204 is used for the interference of the common-mode signal transmitting ARC information data, and error to some extent.In the present embodiment, Circuit tuning 230 is according to HEC network data D
hECand ARC information data D
aRC, adjustment variable resistor R1, R2 at least one of them resistance value, can mate with impedance R3, R4 respectively to make the resistance value of variable resistor R1, R2.For example, if impedance R3, R4 of signal transmssion line 202,204 are respectively 50 Ω and 45 Ω, then the resistance value of variable resistor R1, R2 can be adjusted to 50 Ω and 45 Ω or other combination by Circuit tuning 230 respectively, to meet the relation of (R1/R3)=(R2/R4).
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the Circuit tuning 230 according to one embodiment of the invention.As shown in Figure 3, Circuit tuning 230 realizes with a correlator, and Circuit tuning 230 includes a polarity sign unit 310, two multiplier 320,330, accumulators 340 and an adjustment unit 350, wherein accumulator 340 includes adder 342 and a delay cell 344.
In the operation of the Circuit tuning 230 shown in Fig. 3, first, ARC information data D
aRC(also namely D is worked as after processing through polarity sign unit 310
aRCduring for logical one, export " 1 "; And work as D
aRCduring for logical zero, export "-1 "), via multiplier 320 and HEC network data D
hECbe multiplied, be multiplied by a yield value V via multiplier 320 more afterwards
gafter input in accumulator 340 to produce a cumulative data D
acc.Finally, adjustment unit 350 is again according to cumulative data D
accto produce two control signal V
c1, V
c2, to adjust the resistance value of at least one in variable resistor R1, R2 respectively.
Specifically, if the impedance of variable resistor R1, R2 is mated with impedance R3, R4 of signal transmssion line 202,204, then HEC network data D
hECwith ARC information data D
aRCshould not relevance be had, therefore, cumulative data D
accshould be in fact 0.Otherwise, if the impedance of variable resistor R1, R2 is not mated with impedance R3, R4 of signal transmssion line 202,204, HEC network data D
hECaRC information data D can be subject to
aRCimpact, there is relevance between the two, cumulative data D
accto not be 0, now adjustment unit 350 can according to cumulative data D
accadjust the resistance value of at least one in variable resistor R1, R2, mate with impedance R3, R4 of signal transmssion line 202,204 to make the impedance of variable resistor R1, R2.
In addition, according to transmission line theory, impedance R3, R4 of signal transmssion line 202,204 can change to some extent because the frequency of transmission information data is thereon different, and therefore, gain adjusting unit 240 can according to ARC information data D
aRCfrequency change degree decide the yield value V shown in Fig. 3
g, to use optimal speed to adjust the impedance of variable resistor R1, R2.Specifically, when information data changes greatly, time frequency variation is fireballing, gain adjusting unit 240 can export larger yield value V
g, can the current frequency of fast reaction to make the impedance of variable resistor R1, R2 regulate the speed; Otherwise when information data change is little, time frequency variation is slow-footed, gain adjusting unit 240 can export less yield value V
g, with choosing of the resistance value of stable variable resistor R1, R2.
As mentioned above, network receiver 200 of the present invention can adjust the resistance value of variable resistor R1, R2, to mate with impedance R3, R4 of signal transmssion line 202,204, thus, and HEC network data D
hECjust the interference of common-mode signal can not be subject to.In addition, for signal output part Tx+, Tx-of network receiver 200, due to the relation of impedance matching, also can guarantee that signal output part Tx+, Tx-are sent to the amplitude symmetry of the signal on signal transmssion line 202,204, to meet the specification of HDMI.
In another embodiment, multiplier 330 can remove and not have influence on the operation of network receiver 200 from Circuit tuning 230, and the gain adjusting unit 240 now shown in Fig. 2 is also removable, and the change in these designs should be under the jurisdiction of category of the present invention.
In addition, in the above-described embodiments, network receiver 200 meets HDMI 1.4 editions specifications, and is used for reception/transmission HEC network data and ARC information data, but this is only an example and illustrates and not as restriction of the present invention.In other embodiment of the present invention, network receiver can be used for receiving any one first data and one second data with other specification, and wherein these first data use difference mode signal to transmit, and these second data use common-mode signal to transmit.
Please refer to Fig. 4, Fig. 4 is the control method of a kind of network receiver according to one embodiment of the invention.With reference to figure 2, Fig. 4, flow process is described below:
Step 400: one first variable resistor and a second adjustable resistance are provided, this first variable resistor is connected to one first signal transmssion line by a first node, and this second adjustable resistance is used for being connected to a secondary signal transmission line by a Section Point;
Step 402: receive from one first signal of this first node and the secondary signal from this Section Point;
Step 404: obtain a difference according to this first signal and this secondary signal, and process to produce one first data to this difference;
Step 406: obtain a summation according to this first signal and this secondary signal, and process to produce one second data to this summation.
Step 408: according to the resistance value of at least one in these first data and this first, second variable resistor of this second data point reuse.
Wherein, this first signal transmssion line and this secondary signal transmission line are used for transmission/reception HEC network data and ARC information data.
Brief summary the present invention, in network receiver of the present invention and its control method, two variable resistors are provided to be coupled to two bars transmission lines respectively, and according to the network data that receives and information data to adjust two variable-resistance impedances of network receiver, with make these two variable-resistance impedances can with the impedance matching of two bars transmission lines, and the quality of network data received by improving.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a network receiver, includes:
One first variable resistor, is coupled to one first signal transmssion line via a first node, and wherein said first signal transmssion line is used for transmission one first signal;
One the second adjustable resistance, is coupled to a secondary signal transmission line via a Section Point, and wherein said secondary signal transmission line is used for transmission one secondary signal;
One first processing unit, is coupled to described first node and described Section Point, obtains a difference according to described first signal and described secondary signal, and processes to produce one first data to described difference;
One second processing unit, is coupled to described first node and described Section Point, obtains a summation according to described first signal and described secondary signal, and processes to produce one second data to described summation; And
One Circuit tuning, is coupled to described first processing unit and described second processing unit, according to the resistance value of at least one in first, second variable resistor described in described first data and described second data point reuse,
Wherein, described network receiver meets a high resolution multimedia interface specification, and described first data are high resolution multimedia interface EtherChannel data, and described second data are that an information returns channel data.
2. network receiver according to claim 1, wherein, described Circuit tuning includes:
One multiplier, is used for carrying out multiply operation to described first data and described second data, to produce one the 3rd data;
One accumulator, is coupled to described multiplier, described 3rd data that cumulative described multiplier produces, to produce an accumulated value; And
One adjustment unit, is coupled to described accumulator, is used for according to described accumulated value to adjust in first, second variable resistor described at least one.
3. network receiver according to claim 1, wherein, described Circuit tuning includes:
One first multiplier, is used for carrying out multiply operation to these the first data and this second data, to produce one the 3rd data;
One second multiplier, is coupled to described first multiplier, is used for described 3rd data to be multiplied by a yield value, to produce one the 4th data;
One accumulator, is coupled to described second multiplier, is used for described 4th data that cumulative described second multiplier produces, to produce an accumulated value;
One adjustment unit, is coupled to described accumulator, is used for according to described accumulated value to adjust the resistance value of at least one in first, second variable resistor described.
4. network receiver according to claim 3, separately includes:
One gain adjusting unit, is coupled to described second processing unit and described second multiplier, is used for receiving described second data, and according to described second data to determine described yield value.
5. network receiver according to claim 4, wherein, described gain adjusting unit according to the frequency variation speed of described second data to determine described yield value.
6. the control method of a network receiver, described network receiver includes one first variable resistor and a second adjustable resistance, described first variable resistor is connected to one first signal transmssion line by a first node, and described the second adjustable resistance is connected to a secondary signal transmission line by a Section Point, described method includes:
Receive from one first signal of described first node and the secondary signal from described Section Point;
Obtain a difference according to described first signal and described secondary signal, and process to produce one first data to described difference;
Obtain a summation according to described first signal and described secondary signal, and process to produce one second data to described summation; And
According to described first data and described second data, adjust the resistance value of at least one in first, second variable resistor described,
Wherein, described network receiver meets a high resolution multimedia interface specification, and described first data are high resolution multimedia interface EtherChannel data, and described second data are that an information returns channel data.
7. method according to claim 6, wherein, the step adjusting at least resistance value of one in described first variable resistor and described the second adjustable resistance includes:
Multiply operation is carried out to described first data and described second data, to produce one the 3rd data;
Cumulative described 3rd data, to produce an accumulated value; And
According to described accumulated value to adjust in first, second variable resistor described at least one.
8. method according to claim 6, wherein, the step adjusting at least resistance value of one in described first variable resistor and described the second adjustable resistance includes:
Multiply operation is carried out to described first data and described second data, to produce one the 3rd data;
Described 3rd data are multiplied by a yield value, to produce one the 4th data;
Cumulative described 4th data, to produce an accumulated value;
According to described accumulated value to adjust the resistance value of at least one in first, second variable resistor described.
9. method according to claim 8, also includes:
According to described second data to determine described yield value.
10. method according to claim 9, wherein, according to described second data to determine that the step of described yield value includes:
According to the frequency variation speed of described second data to determine described yield value.
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| CN201110154521.9A CN102821070B (en) | 2011-06-09 | 2011-06-09 | Network receiver and control method thereof |
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|---|---|---|---|
| CN201110154521.9A CN102821070B (en) | 2011-06-09 | 2011-06-09 | Network receiver and control method thereof |
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| CN102821070B true CN102821070B (en) | 2015-08-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625875A (en) * | 2002-02-01 | 2005-06-08 | 英特尔公司 | Termination pair for a differential line with matched impedance |
| CN101807892A (en) * | 2009-02-13 | 2010-08-18 | 瑞昱半导体股份有限公司 | Line driver with function of automatically adjusting output impedance |
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| CN100461632C (en) * | 2005-06-02 | 2009-02-11 | 华为技术有限公司 | Negative feedback circuit, as well as method and device for implementing impedance match of transmission line in chip by using the circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625875A (en) * | 2002-02-01 | 2005-06-08 | 英特尔公司 | Termination pair for a differential line with matched impedance |
| CN101807892A (en) * | 2009-02-13 | 2010-08-18 | 瑞昱半导体股份有限公司 | Line driver with function of automatically adjusting output impedance |
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