CN103560809B - Communication device and noise cancellation method - Google Patents
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Abstract
The present invention discloses a kind of communication device and noise cancellation method.This communication device includes level determination block, receives estimating signal, determines multiple voltage level and correspond to multiple voltage strengths of multiple voltage level, to produce the first digital signal according to estimating signal; Digital/analog converter, receives described first digital signal, according to described multiple voltage level and described multiple voltage strength, described first digital signal is converted to the analog signal of an impulse form; Analog/digital converter, receives one first difference signal that a Received signal strength and described impulse form analog signal subtract each other generation, and simulates to digital translation to described first difference signal, to produce one second digital signal; And rear end cancellation module, analog signal according to described impulse form calculates and to respond identical one with the input nonlinearities of described analog/digital converter and export disturbance response, produces described estimating signal according to described output disturbance response and described second digital signal.
Description
The divisional application that the application is the applying date is on September 01st, 2010, application number is 201010274208.4, denomination of invention is the patent application of " communication device and noise cancellation method ".
Technical field
The present invention relates to a kind of communication device, particularly a kind of communication device eliminating echo and cross-talk.
Background technology
Fig. 1 illustrates the schematic diagram of general communication device.Communication device 10 includes transmission medium 11, hybrid circuit (HybridCircuit) 12, local transtation mission circuit Tx and local reception circuit Rx.By transmission medium 11, communication device 10 and remote communication device can carry out Signal transmissions and reception.General local transtation mission circuit Tx includes digital/analog converter (not shown), after signal is carried out numeral to analog-converted by it, produces signal transmission STX, and is exported by mixing type circuit 12 and transmission medium 11.And local reception circuit Rx includes analog/digital converter (not shown), the Received signal strength SRX inputted by transmission medium 11 and mixing type circuit 12 carries out simulating to digital translation process by it.
Because the transmitting-receiving of communication device 10 signal is often carried out simultaneously, so when the local reception circuit Rx of communication device 10 receives remote communication device signal SRX, the echo (Echo) that can be subject to being returned by the bounce-back of remote communication device after the local transtation mission circuit Tx of communication device 10 sends signal is disturbed, also the local transtation mission circuit near-end crosstalk of coming that be coupled disturbs (Near-EndCrossTalk near being subject to, NEXT), the communication quality of communication system is caused to reduce.
Moreover, the signal SRX that the local reception circuit Rx of communication device 10 receives can make signal power diminish because of transmission range, and local reception circuit Rx also can receive the echo signal more much larger than signal SRX power simultaneously, and in order to can simultaneously complete reception deal carefully with this two kinds of signals, the dynamic range (Dynamicrange) of the analog/digital converter of local reception circuit Rx just must design very large.So, communication device design complexities will be caused to improve, cause the problem that production cost improves.
Summary of the invention
An object of the present invention is to provide a kind of communication device, and it can improve the design complexities of analog/digital converter in communication device.
An object of the present invention is to provide a kind of communication device, and it can eliminate the input nonlinearities response of analog/digital converter in communication device and the error exporting disturbance response.
One embodiment of the invention provide a kind of communication device, include level determination block, digital/analog converter and analog/digital converter.This level determination block receives estimating signal, determines multiple voltage level and correspond to multiple voltage strengths of multiple voltage level, to produce the first digital signal according to estimating signal.Digital/analog converter receives the first digital signal, according to multiple voltage level and multiple voltage strength, the first digital signal is converted to the analog signal of pulse (pulse) form.And the analog signal that analog/digital converter receives a Received signal strength and impulse form subtracts each other the first difference signal of generation, and simulate to digital translation to the first difference signal, to produce the second digital signal.Wherein, the pulse period of the analog signal of this impulse form is less than a sampling period of this analog/digital converter.
One embodiment of the invention provide a kind of communication device, include level determination block, digital/analog converter, analog/digital converter and rear end cancellation module.Level determination block receives estimating signal, determines multiple voltage level and correspond to multiple voltage strengths of multiple voltage level, to produce the first digital signal according to estimating signal.Digital/analog converter receives the first digital signal, according to multiple voltage level and multiple voltage strength, this first digital signal is converted to the analog signal of impulse form.The analog signal that analog/digital converter receives a Received signal strength and impulse form subtracts each other the first difference signal of generation, and simulates to digital translation to the first difference signal, to produce the second digital signal.And rear end cancellation module calculates according to the analog signal of impulse form and responds identical output disturbance response with the input nonlinearities of analog/digital converter, according to exporting disturbance response and the second digital signal produces this estimating signal.
One embodiment of the invention provide a kind of method of reseptance eliminating echo and cross-talk, include the following step: first, according to estimating signal, determine multiple voltage strengths of multiple voltage level and corresponding the plurality of voltage level.According to multiple voltage level and estimating signal, produce digital signal.Then, according to multiple voltage level and multiple voltage strength, digital signal is converted to the analog signal of impulse form.Afterwards, difference signal between the analog signal of Received signal strength and impulse form is converted to the second digital signal, and calculate according to the analog signal of impulse form and respond identical output disturbance response with the input nonlinearities of analog/digital converter, according to exporting disturbance response and the second digital signal produces this estimating signal.
The communication device of the embodiment of the present invention and method utilize digital/analog converter to produce the analog signal of impulse form, the output disturbance response of analog/digital converter can be allowed to respond identical with the input nonlinearities of analog front circuit, and back-end circuit can try to achieve the complete channel information of original received signal in the digital domain, with the error that the input nonlinearities of the output disturbance response and analog front circuit of eliminating analog/digital converter responds, and accurately eliminate the composition of echo and cross-talk.Meanwhile, the object that analog/digital converter reduces dynamic range can be reached, improve its design complexities.
Accompanying drawing explanation
Fig. 1 illustrates the schematic diagram of known communication device.
Fig. 2 illustrates the schematic diagram of the communication device of one embodiment of the invention.
Fig. 3 A illustrates that one of the communication device of one embodiment of the invention runs oscillogram.
Fig. 3 B illustrates that one of the communication device of one embodiment of the invention runs oscillogram.
Fig. 3 C illustrates that one of the communication device of one embodiment of the invention runs oscillogram.
Fig. 4 illustrates that one of known communication device runs oscillogram.
Fig. 5 illustrates the schematic diagram of the rear end cancellation module of the communication device of one embodiment of the invention.
Fig. 6 illustrates the schematic diagram of the communication device of another embodiment of the present invention.
Fig. 7 A illustrates the schematic diagram of the communication device of another embodiment of the present invention.
Fig. 7 B illustrates the schematic diagram of the communication device of another embodiment of the present invention.
Fig. 8 A illustrates the schematic diagram of the communication device of another embodiment of the present invention.
Fig. 8 B illustrates the schematic diagram of the communication device of another embodiment of the present invention.
[main element symbol description]
10,100 communication device 11 transmission mediums
12 hybrid circuit Tx transtation mission circuits
Rx receiving circuit 110,161 calculator
120 digital/analog converter 130 level determination block
140,141,142 analog front circuit 150 analog/digital converters
160 rear end cancellation module 162 receive signal processing circuits
Unit estimated by 163 error limitation devices 164
170 respond module
Embodiment
Each embodiment of communication device of the present invention is described in detail below with reference to accompanying drawing.
Fig. 2 illustrates the schematic diagram of the communication device of one embodiment of the invention.This communication device 100 is applicable to the receiving circuit Rx of Fig. 1.Communication device 100 includes calculator 110, digital/analog converter 120, level determination block 130, analog front circuit (AnalogFront-End) 140, analog/digital converter (AnalogtoDigitalConvertor, ADC) 150 and rear end cancellation module 160.
Communication device 100 receives a Received signal strength SRX.One embodiment, Received signal strength SRX can include the signal that remote communication device transmits, and the noise contribution of the echo that signal is carried secretly (Echo) and cross-talk (Near-EndCrossTalk, NEXT).
Calculator 110 in order to Received signal strength SRX to be deducted the analog signal A1 of impulse form, to produce the first difference signal SDF1.One embodiment, calculator 110 can be subtracter.
The first difference signal SDF1 that analog front circuit 140 exports in order to process calculator 110.One embodiment, analog front circuit 140 can combine in order to carry out the process of signal convergent-divergent and filtering process one of them or its to the first difference signal SDF1.
Digital/analog converter 120 couples calculator 110, receive the first digital signal D1, according to the voltage strength of multiple voltage level L1 ~ Ln and corresponding the plurality of voltage level L1 ~ Ln, this first digital signal D1 is converted to the analog signal A1 of pulse (pulse) form.
Level determination block 130 couples digital/analog converter 120, in order to receive estimating signal Se, and determine the plurality of voltage level L1 ~ Ln according to estimating signal Se and determine multiple voltage strengths of corresponding multiple voltage level L1 ~ Ln, to produce the first digital signal D1.Wherein, numerical value n can be odd number, as 3,5,7,11,13,15...; Or n can be the secondary number formulary of 2, as 2,4,8,16....
Analog/digital converter 150 couples analog front circuit 140, analog signal A1 in order to receive a Received signal strength SRX and this impulse form subtracts each other the first difference signal SDF1 of generation, and simulate to digital translation to the first difference signal SDF1, to produce the second digital signal D2.
Rear end cancellation module 160 is in order to the echo in estimation and elimination Received signal strength SRX and cross-talk noise composition, and it produces above-mentioned estimating signal Se according to desired signal (DesiredSignal) Sd and the second digital signal D2.One embodiment, estimating signal Se is the estimated value of echo and cross-talk noise composition.
Operational mode and the principle of embodiment of the present invention communication device 100 is described in detail below with reference to Fig. 2, Fig. 3 A ~ Fig. 3 C and Fig. 4.
Operationally, communication device 100 receives a Received signal strength SRX.Level determination block 130 can determine number and the associated voltage intensity of voltage level L1 ~ Ln according to estimating signal Se, and produces the first digital signal D1.
Then, the first digital signal D1 is converted to the analog signal A1 of impulse form according to voltage level L1 ~ Ln and associated voltage intensity by digital/analog converter 120.And the analog signal A1 that analog front circuit 140 receives a Received signal strength SRX and impulse form subtract each other after the first difference signal SDF1, and after treated (as convergent-divergent and/or filtering), be supplied to analog/digital converter 150.Because Received signal strength SRX has deducted echo and the cross-talk ingredient noise of estimating signal Se estimation, so the amplitude range of Received signal strength SRX can be contracted in the receivable dynamic range of analog/digital converter 150.Therefore, when Received signal strength SRX is by analog/digital converter 150, analog/digital converter 150 can normal process Received signal strength SRX, and signal can not be cut down because exceeding the dynamic range of analog/digital converter 150.
Then, rear end cancellation module 160 receives the second digital signal D2 that analog/digital converter 150 produces, echo and the cross-talk of Received signal strength SRX existence in the current channel of output disturbance response (Outputinterferenceresponse)-namely of analog/digital converter 150 is estimated, to produce new estimating signal Se according to the second digital signal D2.Afterwards, level determination block 130 is determined multiple voltage level L1 ~ Ln according to new estimating signal Se and is determined multiple voltage strengths of corresponding multiple voltage level L1 ~ Ln, produces the first new digital signal D1.And digital/analog converter 120 produces the analog signal A1 of impulse form again according to new digital signal D1.And process the difference signal SDF1 of its Received signal strength SRX received and analog signal A1 via analog front circuit 140 after, analog/digital converter 150 produces new digital signal D2 according to difference signal SDF1.
Mode according to this, the communication device 100 of the embodiment of the present invention can according to the state of Received signal strength SRX in channel, the voltage level of setting signal and the echo suitably eliminated in Received signal strength SRX and cross-talk composition, solves the problem of known technology; And suitably can reduce the amplitude of Received signal strength SRX, to reduce the dynamic range of analog/digital converter 150 signal transacting, reduce design complexities and production cost.
It is noted that, the communication device 100 of the embodiment of the present invention operationally, the N rank highest order (MostSignificantBit (comprising echo and cross-talk noise composition) in the output disturbance response (Outputinterferenceresponse) of its analog/digital converter 150, MSB) run with coordinating of level determination block 130 by rear end cancellation module 160, and N rank highest order noise is converted to the analog signal A1 of impulse form by digital signal D1 by digital/analog converter 120.So, the noise of N rank highest order (MSB) part can be made to eliminate in the simulation process before analog/digital converter 150, and all the other lowest order (LeastSignificantBit, LSB) noises (comprising echo and cross-talk composition) then can be eliminated in the digital processing after analog/digital converter 150 in the output disturbance response of analog/digital converter 150.Such as, all the other lowest order (LeastSignificantBit, LSB) noise sections can be eliminated in rear end cancellation module 160.
As shown in Fig. 3 A ~ Fig. 3 C, these accompanying drawings illustrate the oscillogram of the coherent signal embodiment that communication device 100 runs.Wherein, horizontal axis plots time T, vertical axis represents voltage V, and V1 is the waveform of Received signal strength SRX, and V2 is the waveform of analog signal (N rank highest order (MSB) noise) A1 of impulse form.One embodiment, the analog signal A1 of impulse form can be return-to-zero pulse (return-zeropulse) form signal.
In general, input nonlinearities response (inputinterferenceresponse) of analog front circuit 140 is different from the output disturbance response (outputinterferenceresponse) of analog/digital converter 150.But the communication device 100 of the embodiment of the present invention adopts digital/analog converter 120 to export the waveform of impulse form, the input nonlinearities that mode communication device 100 can be sampled to the analog front circuit 140 identical with the output disturbance response of analog/digital converter 150 at numeric field (digitaldomain) according to this responds.
And the principle that the input disturbance why communication device 100 of the embodiment of the present invention can be sampled to the analog front circuit 140 identical with the output disturbance response of analog/digital converter 150 in the digital domain responds is as follows:
When digital/analog converter 120 exports the waveform V2 of impulse form (as Fig. 3 B), the signal form that can be sampled to due to digital processing can be Z territory (Z-domain) (being such as the superset (superset) of frequency domain (frequencydomain)) form, and in digital processing, can be the formal layout in Z territory by the waveform transformation of impulse form, therefore the signal of impulse form can be processed by digital circuit.
In addition, when sampled signal, the signal only needing to allow the output disturbance response of analog/digital converter 150 sample is identical with the waveform that the input nonlinearities of analog front circuit 140 responds, and do not need to be sampled to each time point, so the pulse that digital/analog converter 120 need only be exported, after the translation operation responded through analog front circuit 140, as spatial convolution operation (convolution), do not have influence on the next sample time (sampletime) of analog/digital converter 150.Mode according to this, back-end circuit (as rear end cancellation module 160) just can utilize the signal V2 of impulse form to restore the signal waveform V1 of Received signal strength SRX in channel, as shown in Figure 3 C.So, back-end circuit can try to achieve the complete channel information of original received signal SRX in the digital domain, can allow the rear end cancellation module 160 accurately echo of estimated channel and cross-talk, with produce accurately estimating signal Se to eliminate the composition of echo and cross-talk, also can reach the object that analog/digital converter 150 reduces dynamic range, improve its complexity.
The conditional of the sampling of analog/digital converter 150 is as follows:
(G(Pu,AFE）<1T）...（1）
Wherein, G representation space convolution algorithm (convolution); The pulse of the impulse form analog signal A1 of Pu representative digit/analog converter 120; AFE represents that the input nonlinearities before analog/digital converter 150 responds or the input nonlinearities of analog front circuit 140 responds; 1T represents time sampling period (1Timesamplingduration) of analog/digital converter 150.
The signal produced due to known digital/analog converter is that zeroth order keeps (zero-orderhold) form, as shown in the waveform V3 in Fig. 4, therefore cannot be sampled in numeric field (digitaldomain), so known communication device N rank highest order (MSB) noise that front-end circuit institute cuts down cannot being reduced.Therefore, rear end cancellation module 160 just cannot know the information of complete channel Received signal strength SRX, correct estimating signal Se so that cannot accurately estimate.
Moreover, the pulse length of the impulse form analog signal A1 that embodiment of the present invention communication device 100 produces will have enough length, the sampling frequency of analog/digital converter 150 must be coordinated, make analog/digital converter 150 can catch the peak position (i.e. undeformed point) of pulse, such as, some X, Y in Fig. 3 A.And on the other hand, the time span of pulse also can not be oversize, must meet above-mentioned conditional (1) simultaneously, the pulse foot that sampling is gone out correctly reverts back the waveform of Received signal strength SRX for back-end circuit reference.For example, as in Fig. 3 A, the pulse period of this impulse form analog signal A1 is 1t, and it is less than sampling period (samplingperiod) 4t of analog/digital converter 150.
One embodiment, speed that digital/analog converter 120 is outputed signal improves, and then makes it output signal to become impulse form.Another embodiment, digital/analog converter 120 can the conducting (ON) when time t1, after time t1 ~ t2 before between cut-off (OFF), until time t2 just conducting (ON), then, after time t2 ~ t3 before between cut-off (OFF), until time t3 just conducting (ON).Mode according to this, constantly repeats the analog signal A1 that can produce impulse form.
Certainly, the control mode of digital/analog converter 120 can be utilized software, firmware or hardware to implement by the circuit of digital/analog converter 120 inside; Or in another embodiment, can utilize and pin (PIN) is set by external input signal to control conducting (ON) or cut-off (OFF); Or in another embodiment, digital/analog converter 120 also can come the conducting of control figure/analog converter 120 output signal or the behavior of cut-off at outer setting control unit (not shown); And the existing or future various control method that develops or control circuit are all applicable to the control of digital/analog converter 120 of the present invention at present.
In addition, the communication device of the embodiment of the present invention can system boot often perform one section of Preset Time or by designer's official hour time, calibrate (calibration) according to the sampling frequency of above-mentioned conditional (1) to the burst length of this digital/analog converter 120 and this analog/digital converter 150, and/or according to whether sampling is calibrated to the sampling frequency of principle to the pulse of digital/analog converter 120 and analog/digital converter 150 of the peak (undeformed point) of the pulse of digital/analog converter 120.
The digital/analog converter of embodiment of the present invention communication device can be current digital/analog converter (CurrentDAC) or is linear digital/analog converter (LineDAC), certainly, the digital/analog converter of embodiment of the present invention communication device is also applicable to the existing or future various digital/analog converter that develops or chromacoder at present.
In addition, rear end of the present invention cancellation module 160 can be implemented by the various existing or future cancellation module with estimation echo and/or cross-talk developed at present.One embodiment, as shown in Figure 5, rear end cancellation module 160 includes calculator 161, receive signal processing circuit 162, error limitation device (ErrorSlicer) 163 and estimation unit 164.Wherein, calculator 161 can be subtracter, and receive signal processing circuit 162 can be equalizer, and if communication device 100 applies to the local reception circuit Rx of Fig. 1, then desired signal Sd can be provided by the local transtation mission circuit Tx of Fig. 1.Notably, those of ordinary skill in the art should understand the operational mode of rear end cancellation module 160 according to diagram, at this, it is no longer repeated.
Notably, if the frequency that analog/digital converter 150 occurs cannot be sampled to the peak position (undeformed point) of pulse, or cannot the regulation of eligible formula (1) time, can at calculator 110 and rear end cancellation module 160(Residualcanceller) between add respond module 170, to simulate the signal response between calculator 110 and rear end cancellation module 160, to compensate the signal A1 size deducted in simulation process, as shown in Figure 6.Wherein, respond module 170 is sef-adapting filter (AdaptiveFilter), is applicable to adaptive algorithm.And adaptive algorithm can be lowest mean square (LeastMeanSquare, LMS) algorithm, recursion least square (RecursiveLeastSquare, RLS) algorithm, the combination of least square (LeastSquare, LS) algorithm one of them or its.
Moreover, in communication device 100, before calculator 110 need only be arranged on analog/digital converter 150, before being not limited to be arranged on analog front circuit 140.Therefore, the setting of calculator 110 can be designed to example as shown in Figure 7 A, 7 B.Notably, according to the configuration mode in Fig. 7 A, rear end cancellation module 160 can calculate according to the analog signal A1 of above-mentioned impulse form and respond identical output disturbance response with the input nonlinearities of analog/digital converter 150, and produces estimating signal Se according to this output disturbance response and the second digital signal D2.
In addition, general analog front circuit 140 can include multiple device, and calculator 110 can be arranged between the devices.As shown in Fig. 8 A, Fig. 8 B, calculator 110 is arranged between the first analog front circuit 141 and the second analog front circuit 142.
In sum, the communication device of the embodiment of the present invention utilizes digital/analog converter to produce the analog signal of impulse form, the output disturbance response of analog/digital converter can be allowed to respond identical with the input nonlinearities of analog front circuit, and back-end circuit can try to achieve the complete channel information of original received signal in the digital domain, with the error that the input nonlinearities of the output disturbance response and analog front circuit of eliminating analog/digital converter responds, and accurately eliminate the composition of echo and cross-talk.Meanwhile, the object that analog/digital converter reduces dynamic range can be reached, improve its design complexities.
Though the present invention is described with embodiment above, therefore do not limit scope of the present invention, only otherwise depart from main idea of the present invention, the sector personage can carry out various distortion or change.
Claims (13)
1. a communication device, includes:
One level determination block, receives an estimating signal, determines multiple voltage level and correspond to multiple voltage strengths of described multiple voltage level, to produce one first digital signal according to described estimating signal;
One digital/analog converter, receives described first digital signal, according to described multiple voltage level and described multiple voltage strength, described first digital signal is converted to the analog signal of an impulse form;
One analog/digital converter, the analog signal receiving a Received signal strength and described impulse form subtracts each other one first difference signal of generation, and simulates to digital translation to described first difference signal, to produce one second digital signal; And
One rear end cancellation module, the analog signal according to described impulse form calculates and to respond identical one with the input nonlinearities of described analog/digital converter and export disturbance response, produces described estimating signal according to described output disturbance response and described second digital signal.
2. communication device according to claim 1, wherein, described input nonlinearities response is the input nonlinearities response of an analog front circuit, and described analog front circuit couples described analog/digital converter.
3. communication device according to claim 1, wherein, the pulse period of the analog signal of described impulse form is less than a sampling period of described analog/digital converter.
4. communication device according to claim 3, wherein, described communication device is when starting shooting and/or perform one section of Preset Time, pulse period according to the analog signal of described impulse form is less than the principle of a sampling period of described analog/digital converter, calibrates the burst length of described digital/analog converter and the sampling frequency of described analog/digital converter.
5. communication device according to claim 1, wherein, the peak swing of described analog/digital converter to each time point of pulse of described analog signal samples.
6. communication device according to claim 5, described communication device is when starting shooting and/or perform one section of Preset Time, sample the principle of the peak swing of each time point of pulse of described analog signal according to described analog/digital converter, the burst length of described digital/analog converter and the sampling frequency of described analog/digital converter are calibrated.
7. communication device according to claim 1, also comprises one first analog front circuit, and described first analog front circuit is in order to amplify and/or filtering process described first difference signal.
8. communication device according to claim 1, also comprises a respond module, and described respond module produces a response signal according to described first digital signal, and compensates described second digital signal with described response signal.
9. communication device according to claim 1, wherein, the numerical value of the number of described multiple voltage level be odd number or be 2 secondary number formulary.
10. eliminate a method of reseptance for echo and cross-talk, include:
According to an estimating signal, determine multiple voltage strengths of multiple voltage level and the described multiple voltage level of correspondence, to produce one first digital signal;
According to described multiple voltage level and described multiple voltage strength, described first digital signal is converted to the analog signal of an impulse form;
A difference signal between the analog signal of one Received signal strength and described impulse form is converted to one second digital signal; And
Analog signal according to described impulse form calculates and to respond identical one with the input nonlinearities of an analog/digital converter and export disturbance response, produces described estimating signal according to described output disturbance response and described second digital signal.
11. methods according to claim 10, wherein, described input nonlinearities response is the input nonlinearities response of an analog front circuit, and described analog front circuit couples described analog/digital converter.
12. methods according to claim 10, wherein, the pulse period of the analog signal of described impulse form is less than a sampling period of described analog/digital converter.
13. methods according to claim 10, the peak swing of wherein said analog/digital converter to each time point of pulse of described analog signal samples.
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| TW200408213A (en) * | 2002-11-07 | 2004-05-16 | Realtek Semiconductor Corp | Initialization method for network system |
| TW200638712A (en) * | 2005-04-18 | 2006-11-01 | Realtek Semiconductor Corp | Multi-carrier communiation system and communication method thereof |
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| CN101567710A (en) * | 2008-04-23 | 2009-10-28 | 瑞昱半导体股份有限公司 | Receiving device capable of eliminating echo and intrusion tone and correlative receiving method thereof |
| 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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| JPH10210132A (en) * | 1997-01-24 | 1998-08-07 | Kyocera Corp | High quality loudspeaking information communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200408213A (en) * | 2002-11-07 | 2004-05-16 | Realtek Semiconductor Corp | Initialization method for network system |
| TW200638712A (en) * | 2005-04-18 | 2006-11-01 | Realtek Semiconductor Corp | Multi-carrier communiation system and communication method thereof |
| CN101030990A (en) * | 2006-03-02 | 2007-09-05 | 三洋电机株式会社 | Echo prevention circuit, filter coefficient setting method, and program |
| CN101567710A (en) * | 2008-04-23 | 2009-10-28 | 瑞昱半导体股份有限公司 | Receiving device capable of eliminating echo and intrusion tone and correlative receiving method thereof |
| 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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| CN102387271B (en) | 2014-03-05 |
| CN103560809A (en) | 2014-02-05 |
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