CN102820897B - Network receiver and adjusting method thereof - Google Patents
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Abstract
The invention discloses a network receiver and an adjusting method thereof. The network receiver comprises a first delay unit, a second delay unit, a processing unit and an adjusting circuit, wherein the first delay unit receives a first signal from a first signal transmission line and delays the first signal to generate a first delayed signal; the second delay unit receives a second signal from a second signal transmission line and delays the second signal to generate a second delayed signal; and by means of the adjusting circuit, the first delay unit and the second delay unit are provided with a plurality of delay combinations, the processing circuit generates a plurality of first data according to the plurality of delay combinations, and the adjusting circuit adjusts delay of at least one of the first delay unit and the second delay unit according to the plurality of first data.
Description
Technical field
The present invention relates to a kind of network receiver, particularly relate to one meet the network receiver of high resolution multimedia interface (High Definition Multimedia Interface, HDMI) 1.4 editions specifications and adjust the method for this 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, allow up-to-date high resolution multimedia interface can transmit/receiving high definition multimedia interface EtherChannel (HDMI Ethernet Channel simultaneously, HEC) network data and audio frequency return channel (AudioReturn Channel, ARC) voice 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 voice 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 voice data is then transmitted by common-mode signal (common mode signal).Therefore, in theory, to obtain HEC network data, as long as the signal subtraction of two bars transmission lines just can be eliminated the ARC voiceband data signal of common mode at receiving terminal, and the difference mode signal for transmission HEC network data can not be interfered with.But, please refer to the common-mode signal shown in Fig. 1, when two bars transmission line (TX+, TX-) quality of transmission HEC network data and ARC voice data are not good, such as when the retardation of two bars transmission lines to signal is variant (phase place of two signals that signal transmssion line transmits is not mated), received common-mode signal then can be caused to have the situation of phase difference, the phenomenon of this common-mode signal phase difference 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 to provide a kind of network receiver and a kind of method adjusting 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.
According to one embodiment of the invention, a kind of network receiver includes one first delay cell, one second delay cell, one first processing unit and a Circuit tuning.This first delay cell is coupled to one first signal transmssion line, and in order to receive from one first signal of this first signal transmssion line, and postpones this first signal to produce the first signal after a delay; This second delay cell is coupled to a secondary signal transmission line, and in order to receive from a secondary signal of this secondary signal transmission line, and postpones this secondary signal to produce secondary signal after a delay; This first processing unit is coupled to this first delay cell and this second delay cell, and in order to process to produce one first data to a difference of secondary signal after the first signal after this delay and this delay; This Circuit tuning is coupled to this first processing unit, and in order to adjust the retardation of at least one in this first, second delay cell.Wherein, this Circuit tuning makes this first delay cell and this second delay cell have more organize retardation and combine, this first processing unit produces many first data respectively according to the combination of this many groups retardation, and this Circuit tuning is according to the retardation of at least one in this first, second delay cell of these many first data point reuse.
According to another embodiment of the present invention, it discloses a kind of method of adjustment of network receiver, wherein this network receiver includes one first delay cell and one second delay cell, this first delay cell is coupled to one first signal transmssion line, and this second delay cell is coupled to a secondary signal transmission line, the method includes: use the combination of many group retardations to postpone multiple first signals from this first signal transmssion line to produce the first signal after multiple delay respectively, and the multiple secondary signals postponed from this secondary signal transmission line are to produce secondary signal after multiple delay, process to produce many first data to the difference after the first signal after the plurality of delay and the plurality of delay between secondary signal respectively, and according to these many first data, to adjust the retardation of at least one in this first, second delay cell.
According to another embodiment of the present invention, a kind of network receiver includes one first processing unit, one second processing unit and a Circuit tuning, wherein this first processing unit includes a subtracter, one first variable capacitance, one first low pass filter and one first analog-digital converter, and this second processing unit includes an adder, one second variable capacitance, one second low pass filter and one second analog-digital converter.This subtracter, in order to receive from one first signal of one first signal transmssion line, and from a secondary signal of a secondary signal transmission line, and calculates a difference of this first signal and this secondary signal; This first variable capacitance is coupled to this subtracter, and in order to postpone this difference to produce difference after a delay; This first low pass filter is in order to carry out filtering operation to produce difference after a filtering to difference after this delay; This first analog-digital converter is coupled to this first low pass filter, and in order to carry out Analog-digital Converter operation to difference after this filtering, to produce one first data; This adder is in order to receive this first signal and this secondary signal, and a summation of secondary signal after the first signal and this delay after calculating this delay; This second variable capacitance is coupled to this adder, and in order to postpone this summation to produce summation after a delay; This second low pass filter is in order to carry out filtering operation to produce summation after a filtering to summation after this delay; This second analog-digital converter is coupled to this second low pass filter, and in order to carry out Analog-digital Converter operation to summation after this filtering, to produce one second data; This Circuit tuning is coupled to this first processing unit and this second processing unit, and in order to according to these the first data, to adjust the capacitance of at least one in this first, second variable capacitance.Wherein, this Circuit tuning adjusts this first variable capacitance and this second variable capacitance to be had and morely organizes capacitance and combine, this first processing unit produces many first data respectively according to the combination of this many groups capacitance, and this Circuit tuning is according to the capacitance of at least one in this first, second variable capacitance of these many first data point reuse.
According to another embodiment of the present invention, it discloses a kind of method in order to adjust a network receiver, wherein this network receiver is coupled to one first signal transmssion line and a secondary signal transmission line, the method includes: receive one first signal from this first signal transmssion line, and from a secondary signal of this secondary signal transmission line; Calculate a difference of this first signal and this secondary signal; There is provided one first variable capacitance, to postpone this difference to produce difference after a delay; Filtering operation is carried out to produce difference after a filtering to difference after this delay; Analog-digital Converter operation is carried out to difference after this filtering, to produce one first data; Calculate a summation of secondary signal after the first signal after this delay and this delay; There is provided one second variable capacitance, to postpone this summation to produce summation after a delay; Filtering operation is carried out to produce summation after a filtering to summation after this delay; Analog-digital Converter operation is carried out to summation after this filtering, to produce one second data; More than this first variable capacitance and this second variable capacitance, organize capacitance combination, repeat above-mentioned steps to produce many first data and many second data; And according to these many first data, to adjust the capacitance of at least one in this first, second variable capacitance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the phase place of signal transmssion line common-mode signal when not mating.
Fig. 2 is the schematic diagram of the network receiver according to one embodiment of the invention.
Fig. 3 is the flow chart of a kind of method in order to adjust a network receiver according to the present invention one first embodiment.
Fig. 4 A and Fig. 4 B is the flow chart of a kind of method in order to adjust a network receiver according to the present invention one second embodiment.
Primary clustering symbol description
200 network receiver 202,204 signal transmssion lines
206,208 delay cell 210,220 processing units
212 subtracter 214,224 variable capacitances
216,226 low pass filter 218,228 analog-digital converters
222 adder 230 Circuit tunings
232 snr computation unit 234 worst error comparators
236 control unit 300 ~ 306,400 ~ 422 steps
R1 ~ R4 resistance Rx+, Rx-Signal reception node
Tx+, Tx-signal output part
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 resistance R1, R2, two delay cells 206, 208, two processing units 210, 220, one Circuit tuning 230, two signal output part Tx+, Tx-and two Signal reception node R x+, Rx-, wherein processing unit 210 includes a subtracter 212, one variable capacitance 214, one low pass filter 216 and an analog-digital converter 218, processing unit 220 includes an adder 222, one variable capacitance 224, one low pass filter 226 and an analog-digital converter 228, Circuit tuning 230 includes a signal to noise ratio (Signal to NoiseRatio, SNR) computing unit 232, one worst error comparator 234 and a control unit 236.In addition, Signal reception node R x+, Rx-are coupled to signal transmssion line 202,204 via resistance R1, R2 respectively, and wherein the equiva lent impedance of signal transmssion line 202,204 represents with R3, R4 respectively.
In the present embodiment, network receiver 200 meets HDMI1.4 version specification, can reception/transmission HEC network data and ARC voice data, wherein HEC network data uses difference mode signal transmission on signal transmssion line 202,204, and ARC voice data uses common-mode signal transmission on signal transmssion line 202,204.
After network receiver 200 is connected with the first signal transmssion line 202 and secondary signal transmission line 204, for the multiple retardation combination of delay cell 206,208, and combine for the multiple capacitance of variable capacitance 214,224, processing unit 210 can produce many HEC network data D corresponding respectively to this multiple retardation combination and this multiple capacitance combination
hEC, and according to these many HEC network data D
hECsignal to noise ratio and worst error with determine delay cell 206,208 one optimal delay amount combination, and determine variable capacitance 214,224 one optimal capacitance value combination.
First, control unit 236 exports control signal V
c1to adjust the retardation of delay cell 206,208, delay cell 206,208 is made to have the combination of the first retardation.Then, delay cell 206 via node R+the receive one first signal V1 from signal transmssion line 202, and postpones the first signal V1 to produce the first signal V1 ' after a delay; Delay cell 208 is via node R-the receive secondary signal V2 from signal transmssion line 204, and delay control binary signal V2 is to produce secondary signal V2 ' after a delay.First signal V1 ' and the difference after postponing between secondary signal V2 ' after subtracter 212 computing relay in processing unit 210; Then, variable capacitance 214 postpones this difference to produce difference after a delay, and after this delay, difference is low-pass filtered after device 216 carries out low-pass filtering treatment, carries out Analog-digital Converter operation, produce a HEC network data D via analog-digital converter 218
hEC.Simultaneously, after adder 222 in processing unit 220 adds total delay, the first signal V1 ' produces a summation with the rear secondary signal V2 ' of delay, variable capacitance 224 postpones this summation to produce summation after a delay, after this delay, summation is input to low pass filter 226 and carries out low-pass filtering treatment, carry out Analog-digital Converter operation via analog-digital converter 228 again, produce an ARC voice data D
aRC.
Circuit tuning 230 is according to HEC network data D
hECcarry out FEEDBACK CONTROL, snr computation unit 232 receives HEC network data D
hEC, and calculate HEC network data D
hECa signal to noise ratio; Worst error comparator 234 receives HEC network data D
hEC, and calculate HEC network data D
hECand the difference between a desirable HEC network data, to determine HEC network data D
hECone worst error value of middle data, wherein this worst error value is HEC network data D
hECin worst error value in multiple data error value.Then, Circuit tuning 230 by this correspond to this first retardation combination signal to noise ratio and worst error value be stored in a storage element (not shown), this storage element can in be built in control unit 236.
Lifting the operation that an example illustrates above-mentioned worst error comparator 234, should be noted that following example only illustrates as example, is not restriction of the present invention.Suppose that desirable HEC network data is a succession of data for " 0 ", and the HEC network data D that processing unit 210 exports
hECfor " 0.2 ", " 0.4 ", " 0.3 " and " 0.2 ", then now HEC network data D
hECin the error amount of each data be respectively " 0.2 ", " 0.4 ", " 0.3 " and " 0.2 ".Worst error comparator 234 then can select a wherein maximum error amount (being also " 0.4 ") to be used as worst error value.
In the present embodiment, the signal to noise ratio that snr computation unit 232 produces can reflect HEC network data D
hECin the error/noise trend of long-time (long term), worst error comparator 234 is then to reflect HEC network data D
hECerror/noise within the short time (short term).
Then, control unit 236 adjusts the retardation of delay cell 206,208 again, to make delay cell 206,208, there is the combination of the second retardation, and the signal to noise ratio and worst error value that correspond to the combination of this second retardation is produced via aforementioned operation, be stored in this storage element again, by that analogy, can produce by snr computation unit 232 and worst error comparator 234 many HEC network data D combined corresponding to multiple retardation
hECsignal to noise ratio and worst error value, and to be stored.
Finally, control unit 236 is according to many HEC network data D corresponding to the combination of multiple retardation
hECsignal to noise ratio and worst error value, determine an optimal delay amount combination of delay cell 206,208, and delay cell 206,208 be adjusted to the combination of this optimal delay amount, setting during to carry out transfer of data/reception as network receiver 200 is follow-up.
In addition, control unit 236 also produces control signal V
c2remove the capacitance adjusting variable capacitance 214,224, make variable capacitance 214,224 have the combination of the first capacitance.As previously mentioned, delay cell 206 via node R+the receive one first signal V1 from signal transmssion line 202, and postpones the first signal V1 to produce the first signal V1 ' after a delay; Delay cell 208 is via node R-the receive secondary signal V2 from signal transmssion line 204, and delay control binary signal V2 is to produce secondary signal V2 ' after a delay.Then, after postponing, the first signal V1 ' and the rear secondary signal V2 ' of delay, via the processing unit 210,220 comprising variable capacitance 214 and 224, produces a HEC network data D
hECand ARC voice data D
aRC.Snr computation unit 232 receives HEC network data D
hEC, and calculate HEC network data D
hECa signal to noise ratio; And worst error comparator 234 receives HEC network data D
hEC, and calculate HEC network data D
hECwith HEC network data D
hECbetween difference between an ideal value, determine a worst error value.Then, this signal to noise ratio corresponding to the combination of this first capacitance and worst error value are stored in a storage element (not shown) by Circuit tuning 230.
Similarly, control unit 236 adjusts the capacitance of variable capacitance 214,224 again, variable capacitance 214,224 is made to have the combination of another kind of capacitance, produce by snr computation unit 232 and worst error comparator 234 signal to noise ratio and worst error value that combine corresponding to this kind of capacitance again, and be stored in this storage element.By that analogy, snr computation unit 232 and worst error comparator 234 can produce many HEC network data D combined corresponding to multiple capacitance
hECsignal to noise ratio and worst error value.
Finally, control unit 236 is according to many HEC network data D corresponding to the combination of multiple capacitance
hECsignal to noise ratio and worst error value, to determine an optimal capacitance value combination of variable capacitance 214,224, and control unit 236 adjusts variable capacitance 214,224 to this optimal capacitance value combines, using as the setting of subsequent network receiver 200 when carrying out transfer of data/reception.
It is noted that in the embodiment shown in Figure 2, control unit 236 is simultaneously according to many HEC network data D corresponding to the combination of multiple retardation
hECsignal to noise ratio and worst error value, with determine delay cell 206,208 optimal delay amount combination.But in another embodiment of the invention, control unit 236 can only according to many HEC network data D corresponding to the combination of multiple retardation
hECsignal to noise ratio and worst error value one of them decide optimal delay amount and combine, also namely snr computation unit 232 and worst error comparator 234 one of them can remove from adjustment unit 230, and do not have influence on operation of the present invention.In like manner, control unit 236 also can only according to many HEC network data D corresponding to the combination of multiple capacitance
hECsignal to noise ratio and worst error value one of them decide optimal capacitance value and combine.
In addition, in another embodiment of the invention, variable capacitance 214,224 can remove respectively from processing unit 210,220, also namely low pass filter 216 directly processes the difference that subtracter 212 exports, low pass filter 226 directly processes the summation that adder 222 exports, and control unit 236 only needs to produce control signal V
c1.In addition, in another embodiment of the present invention, variable capacitance 214,224 also can be replaced by a fixed capacity respectively, and namely control unit 236 does not need to produce control signal V
c2.Change in these designs all should be under the jurisdiction of category of the present invention.
In addition, in another embodiment of the present invention, delay cell 206,208 can remove from network receiver 200, namely the subtracter 212 in processing unit 210 receives and calculates a difference of the first signal V1 and secondary signal V2, adder 222 in processing unit 220 receives and calculates a summation of the first signal V1 and secondary signal V2, and control unit 236 does not need to produce control signal V
c1.Change in these designs all should be under the jurisdiction of category of the present invention.
In the above-described embodiments, network receiver 200 meets HDMI1.4 version specification, but this is only an example explanation and is not as restriction of the present invention.In other embodiments of the 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. 3, Fig. 3 is the flow chart of the method for adjustment of the network receiver of foundation the present invention one first embodiment.With reference to figure 2,3, flow process is described below:
Step 300 a: network receiver is provided, wherein this network receiver includes one first delay cell and one second delay cell, this first delay cell is coupled to one first signal transmssion line, and this second delay cell is coupled to a secondary signal transmission line.
Step 302: use the combination of many group retardations to postpone multiple first signals from this first signal transmssion line to produce the first signal after multiple delay respectively, and the multiple secondary signals postponed from this secondary signal transmission line are to produce secondary signal after multiple delay.
Step 304: process to produce many first data to the difference after the first signal after the plurality of delay and the plurality of delay between secondary signal respectively.
Step 306: according to these many first data, to adjust the retardation of at least one in this first, second delay cell.
Please refer to Fig. 4 A, 4B, Fig. 4 A, 4B are the flow chart of the method for adjustment of a kind of network receiver of foundation the present invention one second embodiment.With reference to figure 2,4, flow process is described below:
Step 400: provide a network receiver, wherein this network receiver is coupled to one first signal transmssion line and a secondary signal transmission line.
Step 402: receive one first signal from this first signal transmssion line, and from a secondary signal of this secondary signal transmission line.
Step 404: the difference calculating this first signal and this secondary signal.
Step 406: provide one first variable capacitance, to postpone this difference to produce difference after a delay.
Step 408: filtering operation is carried out to produce difference after a filtering to difference after this delay.
Step 410: carry out Analog-digital Converter operation to difference after this filtering, to produce one first data.
Step 412: the summation calculating this first signal and this secondary signal.
Step 414: provide one second variable capacitance, to postpone this summation to produce summation after a delay.
Step 416: filtering operation is carried out to produce summation after a filtering to summation after this delay.
Step 418: carry out Analog-digital Converter operation to summation after this filtering, to produce one second data.
Step 420: the many groups capacitance for this first variable capacitance and this second variable capacitance combines, repeats step 402 ~ 418 to produce many first data and many second data.
Step 422: according to these many first data, to adjust the capacitance of at least one in this first, second variable capacitance.
Brief summary the present invention, at network receiver of the present invention and in order to adjust in network receiver method, two delay cells are provided and/or are two variable capacitances, and according to the HEC network data that receives to adjust two delay units delay amounts of network receiver and/or to be the capacitance of two variable capacitances, as as described in the content of Fig. 2, Circuit tuning 230 combines according to according to different retardation many first data produced, obtain the noise when worst error value corresponding to the combination of different retardation, again according to these many noises when worst error value, determine the retardation of delay cell 206 and 208.Preferably, coordinate the adjustment to variable capacitance 214,224, to make optimal setting to variable capacitance 214,224 and delay cell 206,208, to eliminate phase difference between the first signal V1 and secondary signal V2 to improve the quality of HEC network data.Because network receiver of the present invention only changes the part of receiving terminal, do not need to have influence on the waveform that signal output part Tx+, Tx-export.
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 the covering scope of the present invention.
Claims (20)
1. a network receiver, includes:
One first delay cell, for being coupled to one first signal transmssion line, in order to receive one first signal from described first signal transmssion line, and postpones described first signal to produce the first signal after a delay;
One second delay cell, for being coupled to a secondary signal transmission line, in order to receive the secondary signal from described secondary signal transmission line, and postpones described secondary signal to produce secondary signal after a delay;
One first processing unit, is coupled to described first delay cell and described second delay cell, in order to process to produce one first data to a difference of secondary signal after the first signal after described delay and described delay; And
One Circuit tuning, is coupled to described first processing unit, in order to adjust the retardation of at least one in first, second delay cell described;
Wherein, described Circuit tuning makes described first delay cell and described second delay cell have more organize retardation and combine, described first processing unit produces many first data respectively according to the combination of described many group retardations, described Circuit tuning is according to the retardation of at least one in first, second delay cell described in described many first data point reuse
Described Circuit tuning includes:
One snr computation unit, is coupled to described first processing unit, in order to respectively according to described many first data to calculate multiple signal to noise ratios of described many first data; And
One control unit, is coupled to described snr computation unit, in order at least according to described multiple signal to noise ratio to adjust the retardation of at least one in first, second delay cell described,
Wherein, described first processing unit includes:
One subtracter, is coupled to described first delay cell and described second delay cell, obtains described difference according to secondary signal after the first signal after described delay and described delay;
One first variable capacitance, is coupled to described subtracter, in order to postpone described difference to produce difference after a delay;
One first low pass filter, in order to carry out filtering operation to produce difference after a filtering to difference after described delay; And
One first analog-digital converter, is coupled to described first low pass filter, in order to carry out Analog-digital Converter operation to difference after described filtering, to produce described first data.
2. network receiver according to claim 1, wherein, described network receiver meets a high resolution multimedia interface specification, and described first data are high resolution multimedia interface EtherChannel data.
3. network receiver according to claim 1, wherein, described Circuit tuning also includes:
One worst error comparator, be coupled to described first processing unit, in order to calculate the difference between described many first data and many ideal first data respectively, to determine multiple worst error value, wherein each worst error value is the worst error value in corresponding the first data in multiple data error value;
Wherein said control unit according to described multiple signal to noise ratio and described multiple worst error value, to adjust the retardation of at least one in first, second delay cell described.
4. network receiver according to claim 1, wherein, described Circuit tuning includes:
One worst error comparator, be coupled to described first processing unit, in order to calculate the difference between described many first data and many ideal first data respectively, to determine multiple worst error value, wherein each worst error value is the worst error value in corresponding the first data in multiple data error value; And
One control unit, is coupled to described worst error comparator, in order at least according to described multiple worst error value to adjust the retardation of at least one in first, second delay cell described.
5. network receiver according to claim 1, wherein, described Circuit tuning, according to described many first data, determines an optimal delay amount combination of first, second delay cell described.
6. network receiver according to claim 1, wherein, described network receiver separately includes:
One second processing unit, is coupled to described first delay cell and described second delay cell, in order to process to produce one second data to a summation of secondary signal after the first signal after described delay and described delay;
Wherein, described second data are that audio frequency returns channel (ARC) voice data.
7. network receiver according to claim 6, wherein said second processing unit includes:
One adder, is coupled to described first delay cell and described second delay cell, obtains described summation according to secondary signal after the first signal after described delay and described delay;
One second variable capacitance, is coupled to described adder, in order to postpone described summation to produce summation after a delay;
One second low pass filter, in order to carry out filtering operation to produce summation after a filtering to summation after described delay; And
One second analog-digital converter, is coupled to described second low pass filter, in order to carry out Analog-digital Converter operation to summation after described filtering, to produce described second data.
8. network receiver according to claim 7, wherein said Circuit tuning, according to described many first data, adjusts the capacitance of at least one in first, second variable capacitance described.
9. network receiver according to claim 8, described first variable capacitance of wherein said Circuit tuning adjustment and described second variable capacitance have manyly organize capacitance and combine, and described first processing unit is according to the combination of described many group retardations and organize capacitance more and combine to produce described many first data respectively; And described Circuit tuning is according to described many first data, to determine an optimal delay amount combination of first, second delay cell described, and determine an optimal capacitance value combination of first, second variable capacitance described.
10. the method for adjustment of a network receiver, described network receiver includes one first delay cell and one second delay cell, described first delay cell is coupled to one first signal transmssion line, and described second delay cell is coupled to a secondary signal transmission line, and described method includes:
Use the combination of many group retardations to postpone multiple first signals from described first signal transmssion line to produce the first signal after multiple delay respectively, and the multiple secondary signals postponed from described secondary signal transmission line are to produce secondary signal after multiple delay;
Process to produce many first data to the difference after the first signal after described multiple delay and described multiple delay between secondary signal respectively; And
According to described many first data, to adjust the retardation of at least one in first, second delay cell described,
Wherein, in adjustment first, second delay cell described, at least the step of the retardation of one includes:
Respectively according to described many first data to calculate multiple signal to noise ratios of described many first data; And
According to described multiple signal to noise ratio to adjust the retardation of at least one in first, second delay cell described,
Wherein, the step producing each the first data in described many first data includes:
Calculate the described difference of secondary signal after the first signal after described delay and described delay;
There is provided one first variable capacitance, in order to postpone described difference to produce difference after a delay;
Filtering operation is carried out to produce difference after a filtering to difference after described delay; And
Analog-digital Converter operation is carried out to difference after described filtering, to produce described first data.
11. methods according to claim 10, wherein, described network receiver meets a high resolution multimedia interface specification, and described first data are high resolution multimedia interface EtherChannel data.
12. methods according to claim 10, wherein, in adjustment first, second delay cell described, at least the step of the retardation of one separately includes:
Calculate the difference between described many first data and many ideal first data respectively, to determine multiple worst error value, wherein each worst error value is the worst error value in corresponding the first data in multiple data error value; And
According to described multiple signal to noise ratio and described multiple worst error value, to adjust the retardation of at least one in first, second delay cell described.
13. methods according to claim 10, wherein, in adjustment first, second delay cell described, at least the step of the retardation of one includes:
Calculate the difference between described many first data and many ideal first data respectively, to determine multiple worst error value, wherein each worst error value is the worst error value in corresponding the first data in multiple data error value; And
At least according to described multiple worst error value to adjust the retardation of at least one in first, second delay cell described.
14. methods according to claim 10, separately include:
According to described many first data, to determine an optimal delay amount combination of first, second delay cell described.
15. methods according to claim 10, wherein, described method separately includes:
Process to produce one second data to a summation of secondary signal after the first signal after described delay and described delay, wherein, described second data are that audio frequency returns channel (ARC) voice data.
16. methods according to claim 15, wherein, the step described summation of secondary signal after the first signal after described delay and described delay being processed to produce to described second data includes:
Calculate the described summation of secondary signal after the first signal after described delay and described delay;
There is provided one second variable capacitance, in order to postpone described summation to produce summation after a delay;
Filtering operation is carried out to produce summation after a filtering to summation after described delay; And
Analog-digital Converter operation is carried out to summation after described filtering, to produce described second data.
17. methods according to claim 16, separately include:
According to described many first data, to adjust the capacitance of at least one in first, second variable capacitance described.
18. methods according to claim 17, separately include:
What use described first delay cell and described second delay cell respectively described organizes retardation and combines, and many groups capacitance of described first variable capacitance and described second variable capacitance combines, to produce described many first data corresponding respectively to the combination of described many group retardations and the combination of described many group capacitances; And
According to described many first data, to determine an optimal delay amount combination of first, second delay cell described, and determine an optimal capacitance value combination of first, second variable capacitance described.
19. 1 kinds of network receivers, are coupled to one first signal transmssion line and a secondary signal transmission line, include:
One first processing unit, includes:
One subtracter, in order to receive from one first signal of described first signal transmssion line, and from a secondary signal of described secondary signal transmission line, and calculates a difference of described first signal and described secondary signal;
One first variable capacitance, is coupled to described subtracter, in order to postpone described difference to produce difference after a delay;
One first low pass filter, in order to carry out filtering operation to produce difference after a filtering to difference after described delay; And
One first analog-digital converter, is coupled to described first low pass filter, in order to carry out Analog-digital Converter operation to difference after described filtering, to produce one first data; And
One second processing unit, includes:
One adder, in order to receive described first signal and described secondary signal, and calculates a summation of described first signal and described secondary signal;
One second variable capacitance, is coupled to described adder, in order to postpone described summation to produce summation after a delay;
One second low pass filter, in order to carry out filtering operation to produce summation after a filtering to summation after described delay; And
One second analog-digital converter, is coupled to described second low pass filter, in order to carry out Analog-digital Converter operation to summation after described filtering, to produce one second data; And
One Circuit tuning, is coupled to described first processing unit and described second processing unit, in order to according to described first data, to adjust the capacitance of at least one in first, second variable capacitance described;
Wherein, organizing capacitance described Circuit tuning described first variable capacitance of adjustment and described second variable capacitance have to combine more, described first processing unit produces many first data respectively according to the combination of described many group capacitances, described Circuit tuning is according to the capacitance of at least one in first, second variable capacitance described in described many first data point reuse
Described Circuit tuning includes:
One snr computation unit, is coupled to described first processing unit, in order to respectively according to described many first data to calculate multiple signal to noise ratios of described many first data; And
One control unit, is coupled to described snr computation unit, in order at least according to described multiple signal to noise ratio to adjust the capacitance of at least one in first, second variable capacitance described.
The method of adjustment of 20. 1 kinds of network receivers, wherein said network receiver is coupled to one first signal transmssion line and a secondary signal transmission line, and described method includes:
(1) receive from one first signal of described first signal transmssion line, and from a secondary signal of described secondary signal transmission line;
(2) difference of described first signal and described secondary signal is calculated;
(3) one first variable capacitance is provided, to postpone described difference to produce difference after a delay;
(4) filtering operation is carried out to produce difference after a filtering to difference after described delay;
(5) Analog-digital Converter operation is carried out to difference after described filtering, to produce one first data;
(6) summation of described first signal and described secondary signal is calculated;
(7) one second variable capacitance is provided, to postpone described summation to produce summation after a delay;
(8) filtering operation is carried out to produce summation after a filtering to summation after described delay;
(9) Analog-digital Converter operation is carried out to summation after described filtering, to produce one second data;
(10) more than described first variable capacitance and described second variable capacitance, organize capacitance combination, repeat step (1) ~ (9) to produce many first data and many second data; And
(11) according to described many first data, to adjust the capacitance of at least one in first, second variable capacitance described,
Wherein, in adjustment first, second variable capacitance described, at least the step of the capacitance of one includes:
Respectively according to described many first data to calculate multiple signal to noise ratios of described many first data; And
According to described multiple signal to noise ratio to adjust the capacitance of at least one in first, second variable capacitance described.
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| CN101814934A (en) * | 2009-02-20 | 2010-08-25 | 瑞昱半导体股份有限公司 | Communication device with echo cancellation function and method thereof |
| US7817805B1 (en) * | 2005-01-12 | 2010-10-19 | Motion Computing, Inc. | System and method for steering the directional response of a microphone to a moving acoustic source |
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| CN101814934A (en) * | 2009-02-20 | 2010-08-25 | 瑞昱半导体股份有限公司 | Communication device with echo cancellation function and method thereof |
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