CN103916203B - Time sequence reply device and method - Google Patents
Time sequence reply device and method Download PDFInfo
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- CN103916203B CN103916203B CN201310005112.1A CN201310005112A CN103916203B CN 103916203 B CN103916203 B CN 103916203B CN 201310005112 A CN201310005112 A CN 201310005112A CN 103916203 B CN103916203 B CN 103916203B
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Abstract
The present invention discloses a kind of time sequence reply device, is used for compensating a sampling frequency deviation of an input signal.This time sequence reply device comprises: a sequential error corrector, is used for producing an output signal according to a correction signal and this input signal；One gain controller, is used for adjusting at least one of a signal edge low frequency aberration composition of this output signal and a signal edge high frequency error composition, and signal after output according to this one adjustment；One sequential error detector, is used for producing an error signal according to signal after this adjustment；And a correction signal generator, couple this time order error detector and this time order error corrector, be used for producing this correction signal according to this error signal, and export this correction signal to this time order error corrector to compensate the sampling frequency deviation of this input signal.
Description
Technical field
The present invention is about a kind of time sequence reply device and a kind of time sequence reply method, especially a kind of through gain tune
Whole to reply the time sequence reply device of sequential and sequential answering method.
Background technology
In a communication system, when transmission end is not mated with the sampling rate of receiving terminal, receiving terminal can occur sampling frequency
Rate skew (Sampling Frequency Offset, SFO).This sampling frequency deviation such as not compensated, can cause and take
The error of sampling point, and this error can the most constantly accumulate, and then system effectiveness is caused serious impact, because of
This, general communication system all can be provided with time sequence reply device with the problem compensating sampling frequency deviation.Time sequence reply fills
The design put can be divided into design and the non-data aided (Non-Data Aided) of data auxiliary (Data-Aided)
Design (or the blindest cover formula (Blind) design).Data-aided design is to utilize known pilot signal (Pilot
Or training sequence (Training Sequence) makes the timing synchronization of transmission end and receiving terminal, this kind Signal)
The speed synchronized is set up in design, but can consume extra transmitting bandwidth；The design of non-data aided then without
Pilot signal or training sequence get final product the sequential of synchronous driving end and receiving terminal, thus without consuming extra transmitting pin
Width, but relatively may require that the longer time reaches synchronization.Stricter system is required generally for lock in time
(such as one Wireless LAN communication system) can utilize data-aided design to set up synchronization；And for synchronizing
The looser system (such as one wireless broadcast communication system) of time requirement can utilize the design of non-data aided to build
Vertical synchronization.
Although time sequence reply technology develops, but still there is its weak point.Due to popularizing of mobile device,
Being frequently present of relative motion between transmission end and receiving terminal, this relative motion can cause the change in transmission path and distance,
The frequency making the signal that receiving terminal received produces drift, and this phenomenon is referred to as Doppler effect (Doppler
Effect), and when the speed of this relative motion is faster, Doppler effect can be further obvious, the most known sequential
Answering technology cannot keep stable sample point, and can cause in bit error rate or the packet error of communication system
Rise.
Summary of the invention
In view of above-mentioned, a purpose of the present invention is to provide a kind of time sequence reply device and a kind of time sequence reply method,
With the problem solving prior art.
Another object of the present invention is to provide a kind of time sequence reply device and a kind of time sequence reply method, with through increasing
Benefit adjusts and carries out time sequence reply.
Present invention is disclosed a kind of time sequence reply device, be used for compensating a sampling frequency deviation of an input signal, bag
Contain: a sequential error corrector, be used for exporting letter according to a correction signal use and this input signal to produce one
Number, this output signal comprises a signal edge low frequency aberration composition and a signal edge high frequency error composition；One gain
Controller, couples this time order error corrector, is used for adjusting this signal edge low frequency aberration composition and this signal edge
Signal after at least one of high frequency error composition, and output according to this one adjustment；One sequential error detector, coupling
Connect this gain controller, be used for producing an error signal according to signal after this adjustment；And a correction signal generator,
It is coupled to this time order error corrector and this time order error detector, produces this correction signal according to this error signal,
And export this correction signal to this time order error corrector to compensate this sampling frequency deviation.
The present invention separately discloses a kind of time sequence reply method, is used for compensating a sampling frequency deviation of an input signal,
Being suitable for performing by a sequential return mechanism, this time sequence reply method comprises: according to a correction signal and this is defeated
Entering signal and produce an output signal, wherein this output signal comprises a signal edge low frequency aberration composition and a signal limit
Edge high frequency error composition；Adjust this signal edge low frequency aberration composition and this signal edge high frequency error composition at least
One of them, and signal after output according to this one adjustment；An error signal is produced according to signal after this adjustment；And depend on
Producing this correction signal according to this error signal, wherein this correction signal is used for compensating this sampling frequency deviation.
Feature for the present invention, implementation and effect, hereby coordinate accompanying drawing to make preferred embodiment and describe in detail as follows.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the time sequence reply device of the present invention.
Fig. 2 is the schematic diagram of an embodiment of the gain controller of Fig. 1.
Fig. 3 is the schematic diagram of an embodiment of the gain controller of Fig. 1.
Fig. 4 is the schematic diagram of an embodiment of the gain control circuit of Fig. 2 and Fig. 3.
Fig. 5 a to Fig. 5 c is the waveform diagram of each signal of Fig. 2 to Fig. 4.
Fig. 6 is the schematic diagram of an embodiment of the time sequence reply method of the present invention.
Main element symbol description
100 time sequence reply devices
110 time order error correctors
120 gain controllers
130 time order error detectors
140 correction signal generators
200 time sequence reply devices
210 band edge filter circuits
220 gain control circuits
222 first adjust circuit
224 second adjust circuit
226 add circuits
300 time sequence reply devices
410 first front end shift frequency unit
420 first filter units
430 first adjustment units
440 first rear end shift frequency unit
450 second front end shift frequency unit
460 second filter units
470 second adjustment units
480 second rear end shift frequency unit
S610 foundation one correction signal and an input signal are to produce an output signal
S620 adjusts a signal edge low frequency aberration composition and the signal edge high frequency error one-tenth of this output signal
Signal after at least one divided, and output according to this one adjustment
S630 produces an error signal according to signal after this adjustment
S640 produces this correction signal according to this error signal
Detailed description of the invention
The technical terms of this specification with reference to the idiom of the art, adds as part term is had by this specification
With explanation or definition, the explanation of this part term is the explanation with this specification or definition is as the criterion.It addition, implementing
For may on the premise of, the object described by this specification or the relativeness between event, connotation can comprise directly or
Indirectly relation, so-called " indirectly " refers to the existence still having intermedium or physical space between object, or between self-explanatory characters' part
Still there is the existence of intermediate event or time interval.Furthermore, herein below is about time sequence reply (Timing
Recovery) device and method, the technology commonly seen for this field or principle, if the technology being not related to the present invention is special
Levy, memorandum will be given.Additionally, the step of element or the shape of signal, size, ratio and flow process is suitable in Tu Shi
Sequences etc. are only signal, are to understand the present invention for the art tool usually intellectual to be used, the non-reality to the present invention
The scope of executing is any limitation as.
It addition, each embodiment of following description content is respectively provided with one or more technical characteristic, so this is not intended to
Use present inventor and must implement all technical characteristics in any embodiment simultaneously, or be only capable of being performed separately difference
In embodiment one or all technical characteristic.In other words, on the premise of being embodied as possibility, the art
Tool usually intellectual, optionally can implement depending on design specification or implementation demand according to the disclosure of the present invention
All or part of technical characteristic in any embodiment, or optionally implement in multiple embodiment part or all of
The combination of technical characteristic, thereby increase the elasticity when present invention implements.
The disclosure of the present invention comprises a kind of time sequence reply device and a kind of time sequence reply method, and this time sequence reply fills
Put and method can be applicable to a communication system, for example, can be applicable to meet advanced television system committee
One demodulator (Demodulator) of (Advanced Television Systems Committee, ATSC) specification,
So this not limitation of the present invention, be intended for the present invention illustrate and the art personage understand the present invention it
With, in other words, the art personage can announcement under this invention apply the present invention in other system or device,
Such as it is applied to DVB-T broadcast (Digital Video Broadcasting, a DVB) system.Additionally, in reality
On the premise of executing as possibility, the art tool usually intellectual can select according to the disclosure of the present invention
Element or the step of equivalence realize the present invention, that is the enforcement of the present invention is not limited to disclosed in the present specification
Embodiment.Further, since the part or all of element that comprised of the time sequence reply device of the present invention arbitrary individually and
Element known to Yan Kewei, is not therefore affecting fully disclosing and on the premise of exploitativeness, originally of this device invention
Description will give memorandum for the details realizing the Individual elements of this device invention.Furthermore, the sequential of the present invention is returned
Compound recipe method can perform by the time sequence reply device of the present invention, also may hold through other time sequence reply device
OK, similarly, do not affecting fully the disclosing and on the premise of exploitativeness of the method invention, following description for
The details of the hardware unit performing the method invention will give memorandum.
Referring to Fig. 1, it is the schematic diagram of an embodiment of time sequence reply device of the present invention.As it is shown in figure 1,
The time sequence reply device 100 of the present embodiment comprises: a sequential error corrector (Timing Error Corrector)
110, be used for according to a correction signal and an input signal to produce an output signal, this input signal can be but
It is not limited to by a homophase (In-Phase) fundamental frequency signal and an orthorhombic phase (Quadrature-Phase) fundamental frequency signal institute
The input signal produced, additionally, in the present embodiment, this time order error corrector 110 comprises an interpolating circuit
(Interpolating Circuit), is used for optionally using the multiple of this input signal to take according to above-mentioned correction signal
Sample value carries out interpolation, thereby produces this output signal；One gain controller 120, couples aforementioned time order error school
Positive device 110, is used for adjusting a signal edge low frequency aberration composition and a signal edge high frequency error of this output signal
Signal after at least one of composition, and output according to this one adjustment, in the present embodiment, this gain controller 120
It is a numerical digit automatic gain controller (Digital Auto Gain Controller, DAGC), this signal of its adjustable
Edge low frequency aberration composition and/or the power level of this signal edge high frequency error composition so that this low frequency and/or height
Frequently the power level of error percentage is equal to one of them in multiple preset power level, thereby makes this two error percentage
Power level identical or there is fixed proportion, signal after output comprises the adjustment of this two error percentage the most again；One
Time order error detector 130, couples this gain controller 120, is used for producing one by mistake according to signal after above-mentioned adjustment
Difference signal, in the present embodiment, time order error detector 130 uses Gardner's algorithm (Gardner Algorithm),
Be utilize this algorithm to calculate this adjustment after signal to produce this error signal, the Error Calculation of Gardner's algorithm can
Use following formula subrepresentation:
Wherein n represents the n-th time point, enRepresentative errors, rnWith
And
Represent reception signal and the r of different time pointsnWith rn-2It is separated by signal period T and rnWith rn-1
It is separated by 1/2nd signal period T/2, owing to Gardner's algorithm has been widely used in the art and is
Known to the personage of this area, therefore further theoretical derivation does not repeats them here；And a correction signal generator
140, couple this time order error detector 130 and this time order error corrector 110, be used for according to this error signal
Produce aforementioned corrected signal, and export this correction signal to this time order error corrector 110 to compensate this input signal
Sampling frequency deviation, in the present embodiment, this correction signal generator 140 is a wave filter, and it can be pre-according to one
If this error signal of rule treatments is to produce this correction signal, this preset rules can be to be received in a period of time
Error signal impose average calculating operation, weighted mean operation or other is known and do not affect the fortune of enforcement of the present invention
Calculate.
Note that above-mentioned time order error corrector 110, gain controller 120, time order error detector 130 and
The enforcement explanation of correction signal generator 140 or example are used to allow the art personage understand the present invention, rather than
Being used for limiting the present invention, in other words, the art tool usually intellectual announcement under this invention can use it
Its technology or different set are to realize upper Katyuan part, and for example, this time order error corrector 110 can comprise a phase
Position produces and selection circuit is to replace aforementioned interpolating circuit, and this phase place produces and selection circuit can produce multiple sampling phase
Position, and it is sampled producing aforementioned to this input signal according to the suitable sampling phase of aforementioned corrected signal behavior
Output signal；This gain controller 120 can use more preset power level to promote resolution (Resolution)
Or use less preset power level with cost-effective；This time order error detector 130 can utilize other to be applicable to this
Invention algorithm, such as through Mueller&Muller Detector, Early-Late Time Error Detector,
Zero Crossing Detector etc. produces this error signal；And this correction signal generator 140 is except can be a filter
Outside ripple device, it also can be the computing circuit of other equivalence.Separately note that due to time order error corrector 110, gain
Must be for practising for any one of controller 120, time order error detector 130 and correction signal generator 140 is independent
Knowing technology, therefore this specification is not illustrated by with regard to Individual elements, but focuses on the portion of the technical characteristic of the present invention
Point.Note that the output signal after correcting via time order error corrector 110 is except for performing follow-up sequential again
Outside error correcting routine, can act also as the input of late-class circuit (such as eqalizing cricuit, data processor etc.), but
Due to late-class circuit the technical characteristic processing the non-pass present invention and be the known techniques of the art, therefore at not shadow
On the premise of ringing fully announcement and the exploitativeness of the present invention, the explanation about late-class circuit is omitted at this.
From the above, the present embodiment use gain controller 120 adjust aforementioned signal edge low frequency aberration composition and
Signal edge high frequency error composition, causes time order error to detect to avoid the power level of this two error percentage to change
Error signal variation produced by device 130, or rather, is adjusted by this two error percentage, and time order error is examined
Surveying error signal produced by device 130 can be less sensitive to the change of transmission channel or transmission environment, and can be relatively
Keep stable, and then it is stable to make follow-up timing corrections and system effectiveness be maintained.
Refer to Fig. 2, the schematic diagram of an embodiment of the gain controller 120 of its Fig. 1.In the present embodiment, increase
Benefit controller 120 comprises: a band edge filter circuit (Band-Edge Filtering Circuit) 210 and
Gain control circuit 220.Band edge filter circuit 210 takes according to the output signal of time order error corrector 110
Go out aforementioned signal edge low frequency aberration composition and signal edge high frequency error composition, to produce a filtering signal, and will
The filtering signal comprising this two error percentage is supplied to gain control circuit 220 to be adjusted, and thereby helps follow-up
Time order error detector 130 carry out error-detecting.Note that this two error percentage aforementioned may be by transmission channel
Or other factors affects and has different capacity level (Power Level), and then affect time order error detector 130
The correctness of detection, therefore leach this two error percentage by band edge filter circuit 210, other letter can be reduced
The interference of number composition, and help time sequence reply device 200 to detect error more accurately.It addition, gain control circuit
220 comprise: one first adjusts circuit 222, couples band edge filter circuit 210, are used for adjusting frequency band limit
Signal edge low frequency aberration composition in the filtered signal of edge filter circuit 210, and export a low frequency adjustment according to this
Rear signal；One second adjusts circuit 224, couples band edge filter circuit 210, believes after being used for adjusting this filtering
Signal edge high frequency error composition in number, and export signal after a high frequency adjusts according to this；And an add circuit
226, couple above-mentioned first and adjust circuit 224 and the second adjustment circuit 226, be used for adding up after this low frequency adjusts and believe
Number and high frequency adjust after signal to produce signal after this adjustment.Owing to gain control circuit 220 adjusts this low frequency respectively
Error percentage and this high frequency error composition, make the power level of this two error percentage identical or have fixed proportion, because of
This is conducive to time order error detector 130 to detect error more accurately.
Referring to Fig. 3, it is the schematic diagram of another embodiment of gain controller 120 of Fig. 1.Fig. 3 and Fig. 2
The embodiment that main difference is that Fig. 3 not there is band edge wave filter 210, but utilize gain control circuit
The output signal of 220 direct basis sequential mistake correctors 110 adjusts this signal edge low frequency and high frequency error becomes
Point, in other words, gain control circuit 220 itself can find out signal edge low frequency and the high frequency of this output signal
Error percentage also adjusts according to this, and or rather, the first adjustment circuit 222 of Fig. 3 is now used to adjust sequential
Signal edge low frequency aberration composition in the output signal of error corrector 110, and export according to this one low frequency adjust after
Signal, second adjusts circuit 224 is then used for adjusting the signal edge high frequency error composition in this output signal, and
Export signal after a high frequency adjusts according to this.
Refer to Fig. 4, and please referring collectively to Fig. 5 a to 5c.Fig. 4 is the gain control circuit 220 of Fig. 2 and Fig. 3
The schematic diagram of an embodiment, Fig. 5 a to 5c is then the schematic diagram of each signal waveform of Fig. 2 to Fig. 4.Such as Fig. 4
Shown in, the first adjustment circuit 222 of gain control circuit 220 comprises: one first front end shift frequency unit 410, coupling
Connect aforementioned bands edge filter circuit 210 or this time order error corrector 110, be used for according to band edge filtered electrical
The filtered signal on road 210 or the output signal of this time order error corrector 110 produce signal after one first shift frequency,
In the present embodiment, this first front end shift frequency unit 410 is by low for the signal edge in filtered signal or output signal
Frequently the mid frequency of error percentage moves to the position that frequency is zero, to produce signal after this first shift frequency；One first filter
Ripple unit 420, couples this first front end shift frequency unit 410, is used for producing one the according to signal after this first shift frequency
One filtered signal, this first filter unit 420 retains aforementioned signal edge low frequency aberration composition, but filters aforementioned
Signal component beyond signal edge high frequency error composition or this low frequency aberration composition；One first adjustment unit 430,
Couple this first filter unit 420, be used for according to signal after this first filtered signal generation one first adjustment, this
In embodiment, this first adjustment unit 430 is the power level of this first filtered signal to be adjusted to one first pre-
If power level, with produce this first adjust after signal；And one first rear end shift frequency unit 440, couple this
One adjustment unit 430, is used for producing signal after aforementioned lower frequency adjusts, the present embodiment according to signal after this first adjustment
In, this first rear end shift frequency unit 440 be by this first adjust after the mid frequency of signal to move to original signal edge low
Frequently the position of the mid frequency of error percentage, to produce signal after this low frequency adjusts.
Please continue to refer to Fig. 4, the second adjustment circuit 224 of gain control circuit 220 comprises: one second front end is moved
Frequently unit 450, couple band edge filter circuit 210 or this time order error corrector 110, are used for according to frequency band
The filtered signal of edge filter circuit 210 or the output signal of time order error corrector 110 produce one second shift frequency
Rear signal, in the present embodiment, this second front end shift frequency unit 450 is by the letter in filtered signal or output signal
The mid frequency of number edge high frequency error composition moves to the position that frequency is zero, to produce signal after this second shift frequency；
One second filter unit 460, couples this second front end shift frequency unit 450, is used for according to signal after this second shift frequency
Producing one second filtered signal, this second filter unit 460 retains aforementioned signal edge high frequency error composition, but
Filter the signal component beyond aforementioned signal edge low frequency aberration composition or this high frequency error composition；One second adjusts list
Unit 470, couples this second filter unit 460, after being used for producing one second adjustment according to this second filtered signal
Signal, in the present embodiment, this second adjustment unit 470 be the power level of this second filtered signal is adjusted to
One second preset power level, with produce this second adjust after signal, this second preset power level is equal to aforementioned the
One preset power level, or become fixed proportion with this first preset power level；And one second rear end shift frequency list
Unit 480, couples this second adjustment unit 470, is used for producing aforementioned high frequency according to signal after this second adjustment and adjusts
Rear signal, in the present embodiment, this second rear end shift frequency unit 480 is by the mid frequency of signal after this second adjustment
Move to the position of the mid frequency of original signal edge high frequency error composition, to produce signal after this high frequency adjusts.
Note that after signal adjusts with low frequency after the adjustment of this high frequency, the power level of signal can phase according to the disclosure above
With or become fixed proportion.
In addition to each embodiment of aforementioned time sequence reply device, the present invention also discloses a kind of time sequence reply method, is used for
Compensating a sampling frequency deviation of an input signal, the method can pass through the time sequence reply device of the present invention and performs,
Also may perform through other device that can perform this method.As shown in Figure 6, the time sequence reply method of the present invention
An embodiment comprise the steps of
Step S610: foundation one correction signal and an input signal are to produce an output signal, and this step can be by one
Interpolating circuit performs, and or rather, this step can optionally use this input to believe according to above-mentioned correction signal
Number multiple sampling values carry out interpolation, thereby produce this output signal；
Step S620: the signal edge low frequency aberration composition and the signal edge high frequency that adjust this output signal miss
Signal after at least one of difference composition, and output according to this one adjustment.Furthermore, this step adjustable should
Signal edge low frequency aberration composition and/or the power level of this signal edge high frequency error composition so that this low frequency and/
Or the power level of high frequency error composition is equal to one of them in multiple preset power level, thereby makes this two error
The power level of composition is identical or has fixed proportion, believes after the adjustment that output comprises this two error percentage the most again
Number；
Step S630: produce an error signal according to signal after this adjustment.This step can use Gardner's algorithm,
After thereby calculating this adjustment, signal is to produce this error signal, due to Gardner's algorithm brief introduction it has been observed that and
This algorithm is the known theory of the art, and therefore further instruction gives memorandum at this；
Step S640: producing this correction signal according to this error signal, thereby step S610 can be believed according to this correction
Number optionally use this input signal to compensate this sampling frequency deviation.This step can be performed by a wave filter,
Processing this error signal to produce this correction signal according to a preset rules, this preset rules can be by a period of time
Interior received error signal imposes average calculating operation, weighted mean operation or other is known and do not affect the reality of the present invention
The computing executed.
Please continue to refer to Fig. 6, and please also refer to the explanation of Fig. 2, similarly, an enforcement state of step S620
Sample comprises: take out the signal edge low frequency aberration composition in this output signal and this signal edge high frequency error composition with
Produce filtered signal (step S622.This step is not shown)；This signal limit is adjusted according to this filtered signal
Edge low frequency aberration composition, and export signal (step S624 after a low frequency adjusts according to this.This step is not shown)；Depend on
Adjust this signal edge high frequency error composition according to this filtered signal, and export signal (step after a high frequency adjusts according to this
Rapid S626.This step is not shown)；And add up after this low frequency and high frequency adjust signal to produce signal after this adjustment
(step S628.This step is not shown).It addition, refer to the explanation of Fig. 6 and Fig. 3, step S620 another
One implements aspect comprises: adjust this signal edge low frequency aberration composition according to this output signal, and output one is low according to this
Whole rear signal (step S625 of frequency modulation.This step is not shown)；This signal edge is adjusted high according to this filtered signal
Frequently error percentage, and export signal (step S627 after a high frequency adjusts according to this.This step is not shown)；And add
This low frequency total and high frequency adjust after signal to produce signal (step S628 after this adjustment.This step is not shown).Again
Person, please also refer to explanation and the signal waveforms of Fig. 5 a to 5c of Fig. 4, similarly, abovementioned steps S624
Or S625 can comprise: according to signal after this filtered signal or this output signal generation one first shift frequency；According to being somebody's turn to do
After first shift frequency, signal produces one first filtered signal, and this first filtered signal comprises this signal edge low frequency by mistake
Difference composition；According to signal after this first filtered signal generation one first adjustment；And believe according to after this first adjustment
Number produce this low frequency adjust after signal.Furthermore, please continue to refer to Fig. 4 and Fig. 5 a, 5b, similarly, step S626
Or S627 can comprise: according to signal after this filtered signal or this output signal generation one second shift frequency；According to being somebody's turn to do
After second shift frequency, signal produces one second filtered signal, and this second filtered signal comprises this signal edge high frequency by mistake
Difference composition；According to signal after this second filtered signal generation one second adjustment；And believe according to after this second adjustment
Number produce this high frequency adjust after signal.
Note that and fill owing to the art tool usually intellectual see the related content of Fig. 1 to Fig. 5 c
Divide the time sequence reply method understanding Fig. 6, for exempting from superfluous literary composition, repeat and unnecessary explanation gives memorandum at this.
Separately note that aforementioned time sequence reply device and sequential answering method can be a kind of non-data aideds
(Non-Data-Aided) device and a kind of method of non-data aided, or rather, assembly of the invention
And method is without entering through pilot signal (Pilot Signal) or training sequence (Training Sequence)
Row time order error detects, but the present invention is not precluded from utilizing pilot signal or training sequence sequence to carry out time order error inspection
Survey.
In sum, the present invention is through adjusting the signal edge low frequency aberration composition in signal and signal edge height respectively
Frequently error percentage so that the power level of this two error percentage is equal or has a fixed proportion, thereby avoids because of merit
The variation of rate level and cause the easily and then variation of error signal produced by time order error detector, in other words, adopt
The most less sensitive to the change of transmission channel or transmission environment by the system of the present invention, thus can keep stable.
Although embodiments of the invention are as it has been described above, but those embodiments are not for limiting the present invention, this technology
The technical characteristic of the present invention can be imposed by field tool usually intellectual according to the content expressed or imply of the present invention
Change, all this kind change all may belong to the patent protection category sought by the present invention, in other words, the present invention's
Scope of patent protection must be defined by tbe claims and be as the criterion.
Claims (18)
1. a time sequence reply device, is used for compensating a sampling frequency deviation of an input signal, comprises:
One sequential error corrector, is used for foundation one correction signal and this input signal to produce an output signal；
One gain controller, is used for adjusting signal edge low frequency aberration composition and a signal edge of this output signal
Signal after at least one of high frequency error composition, and output according to this one adjustment；
One sequential error detector, produces an error signal according to signal after this adjustment；And
One correction signal generator, is coupled to this time order error detector and this time order error corrector, for foundation
This error signal produces this correction signal, and exports this correction signal to this time order error corrector to compensate this sampling
Frequency shift (FS)；
Wherein, this gain controller makes this signal edge low frequency aberration composition and this signal edge high frequency error composition
Power level ratio is fixed.
2. time sequence reply device as claimed in claim 1, it is characterised in that this gain controller adjusts respectively
The power of this signal edge low frequency aberration composition and this signal edge high frequency error composition is to one first predetermined power electricity
Put down and one second preset power level.
3. time sequence reply device as claimed in claim 1, it is characterised in that this gain controller comprises an increasing
Benefit control circuit, this gain control circuit comprises:
One first adjusts circuit, is used for adjusting this signal edge low frequency aberration composition, and exports a low frequency adjustment according to this
Rear signal；
One second adjusts circuit, is used for adjusting this signal edge high frequency error composition, and exports a high frequency adjustment according to this
Rear signal；And
One add circuit, is used for adding up after this low frequency and high frequency adjust signal to produce signal after this adjustment.
4. time sequence reply device as claimed in claim 3, it is characterised in that comprise further:
One band edge filter circuit, takes out this signal edge low frequency aberration composition and this letter with from this output signal
Number edge high frequency error composition.
5. time sequence reply device as claimed in claim 4, it is characterised in that this first adjustment circuit comprises:
One first front end shift frequency unit, believes after being used for producing one first shift frequency according to this signal edge low frequency aberration composition
Number；
One first filter unit, is used for producing one first filtered signal according to signal after this first shift frequency, and this is first years old
Filtered signal comprises this signal edge low frequency aberration composition；
One first adjustment unit, is used for according to signal after this first filtered signal generation one first adjustment；And
One first rear end shift frequency unit, is used for producing signal after this low frequency adjusts according to signal after this first adjustment,
And this second adjustment circuit comprises:
One second front end shift frequency unit, believes after being used for producing one second shift frequency according to this signal edge high frequency error composition
Number；
One second filter unit, is used for producing one second filtered signal according to signal after this second shift frequency, and this is second years old
Filtered signal comprises this signal edge high frequency error composition；
One second adjustment unit, is used for according to signal after this second filtered signal generation one second adjustment；And
One second rear end shift frequency unit, is used for producing signal after this high frequency adjusts according to signal after this second adjustment.
6. time sequence reply device as claimed in claim 3, it is characterised in that this first adjustment circuit comprises:
One first front end shift frequency unit, is used for according to signal after this output signal generation one first shift frequency；
One first filter unit, is used for producing one first filtered signal according to signal after this first shift frequency, and this is first years old
Filtered signal comprises this signal edge low frequency aberration composition；
One first adjustment unit, is used for according to signal after this first filtered signal generation one first adjustment；And
One first rear end shift frequency unit, is used for producing signal after this low frequency adjusts according to signal after this first adjustment,
And this second adjustment circuit comprises:
One second front end shift frequency unit, is used for according to signal after this output signal generation one second shift frequency；
One second filter unit, is used for producing one second filtered signal according to signal after this second shift frequency, and this is second years old
Filtered signal comprises this signal edge high frequency error composition；
One second adjustment unit, is used for according to signal after this second filtered signal generation one second adjustment；And
One second rear end shift frequency unit, is used for producing signal after this high frequency adjusts according to signal after this second adjustment.
7. time sequence reply device as claimed in claim 1, it is characterised in that this time order error corrector comprises
One interpolating circuit, be used for according to this correction signal to this input signal to carry out interpolation, thereby produce this output signal.
8. time sequence reply device as claimed in claim 1, it is characterised in that this time order error detector uses
Gardner's algorithm is to produce this error signal according to signal after this adjustment.
9. time sequence reply device as claimed in claim 1, it is characterised in that this correction signal generator calculates
The meansigma methods of this error signal in a period of time, to produce this correction signal.
10. a time sequence reply method, is used for compensating a sampling frequency deviation of an input signal, is suitable for by one
Time sequence reply device performs, and this time sequence reply method comprises:
Foundation one correction signal and this input signal are to produce an output signal；
Adjust a signal edge low frequency aberration composition of this output signal and a signal edge high frequency error composition extremely
Few one of them, to export signal after an adjustment；
An error signal is produced according to signal after this adjustment；And
Producing this correction signal according to this error signal, wherein this correction signal is used for compensating this sampling frequency deviation；
The step wherein adjusting this signal edge low frequency aberration composition and this signal edge high frequency error composition comprises: make
The power level ratio of this signal edge low frequency aberration composition and this signal edge high frequency error composition is fixed.
11. time sequence reply methods as claimed in claim 10, it is characterised in that adjust this signal edge low frequency by mistake
The step of difference composition and this signal edge high frequency error composition comprises: adjust this signal edge low frequency aberration composition respectively
And the power of this signal edge high frequency error composition is to one first preset power level and one second preset power level.
12. time sequence reply methods as claimed in claim 10, it is characterised in that adjust this signal edge low frequency by mistake
The step of difference composition and this signal edge high frequency error composition comprises:
Adjust this signal edge low frequency aberration composition, and export signal after a low frequency adjusts according to this；
Adjust this signal edge high frequency error composition, and export signal after a high frequency adjusts according to this；And
Add up after this low frequency and high frequency adjust signal to produce signal after this adjustment.
13. time sequence reply methods as claimed in claim 12, it is characterised in that comprise further:
This signal edge low frequency aberration composition and this signal edge high frequency error composition is taken out from this output signal.
14. time sequence reply methods as claimed in claim 13, it is characterised in that adjust this signal edge low frequency by mistake
The step of difference composition comprises:
Shift frequency is carried out with signal after generation one first shift frequency according to this signal edge low frequency aberration composition；
It is filtered producing one first filtered signal according to signal after this first shift frequency, this first filtered signal
Comprise this signal edge low frequency aberration composition；
It is adjusted producing signal after one first adjustment according to this first filtered signal；And
According to this first adjust after signal carry out shift frequency with produce this low frequency adjust after signal,
And the step adjusting this signal edge high frequency error composition comprises:
Shift frequency is carried out with signal after generation one second shift frequency according to this signal edge high frequency error composition；
It is filtered producing one second filtered signal according to signal after this second shift frequency, this second filtered signal
Comprise this signal edge high frequency error composition；
It is adjusted producing signal after one second adjustment according to this second filtered signal；And
Shift frequency is carried out to produce signal after this high frequency adjusts according to signal after this second adjustment.
15. time sequence reply methods as claimed in claim 12, it is characterised in that adjust this signal edge low frequency by mistake
The step of difference composition comprises:
Shift frequency is carried out with signal after generation one first shift frequency according to this output signal；
It is filtered producing one first filtered signal according to signal after this first shift frequency, this first filtered signal
Comprise this signal edge low frequency aberration composition；
It is adjusted producing signal after one first adjustment according to this first filtered signal；And
According to this first adjust after signal carry out shift frequency with produce this low frequency adjust after signal,
And the step adjusting this signal edge high frequency error composition comprises:
Shift frequency is carried out with signal after generation one second shift frequency according to this output signal；
It is filtered producing one second filtered signal according to signal after this second shift frequency, this second filtered signal
Comprise this signal edge high frequency error composition；
It is adjusted producing signal after one second adjustment according to this second filtered signal；And
Shift frequency is carried out to produce signal after this high frequency adjusts according to signal after this second adjustment.
16. time sequence reply methods as claimed in claim 10, it is characterised in that according to this correction signal and should
Input signal comprises with the step producing this output signal: according to this correction signal to this input signal to insert
Mend, thereby produce this output signal.
17. time sequence reply methods as claimed in claim 10, it is characterised in that produce according to signal after this adjustment
The step of this error signal comprises: use Gardner's algorithm to produce this error signal according to signal after this adjustment.
18. time sequence reply methods as claimed in claim 10, it is characterised in that producing according to this error signal should
The step of correction signal comprises: calculate the meansigma methods of a period of time this error signal interior, to produce this correction signal.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090263A (en) * | 2006-08-09 | 2007-12-19 | 晨星半导体股份有限公司 | Frequency switching method |
| CN101320982A (en) * | 2007-06-06 | 2008-12-10 | 智原科技股份有限公司 | Time sequence reply parameter generation circuit and signal receiving circuit |
| CN101616112A (en) * | 2008-06-23 | 2009-12-30 | 晨星软件研发(深圳)有限公司 | Frequency offset estimation unit and method of estimation thereof |
| CN101615917A (en) * | 2008-06-23 | 2009-12-30 | 晨星软件研发(深圳)有限公司 | Frequency adjusting device and method of adjustment thereof |
| CN103368891A (en) * | 2012-04-05 | 2013-10-23 | 晨星软件研发(深圳)有限公司 | Signal processing device and method |
-
2013
- 2013-01-07 CN CN201310005112.1A patent/CN103916203B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090263A (en) * | 2006-08-09 | 2007-12-19 | 晨星半导体股份有限公司 | Frequency switching method |
| CN101320982A (en) * | 2007-06-06 | 2008-12-10 | 智原科技股份有限公司 | Time sequence reply parameter generation circuit and signal receiving circuit |
| CN101616112A (en) * | 2008-06-23 | 2009-12-30 | 晨星软件研发(深圳)有限公司 | Frequency offset estimation unit and method of estimation thereof |
| CN101615917A (en) * | 2008-06-23 | 2009-12-30 | 晨星软件研发(深圳)有限公司 | Frequency adjusting device and method of adjustment thereof |
| CN103368891A (en) * | 2012-04-05 | 2013-10-23 | 晨星软件研发(深圳)有限公司 | Signal processing device and method |
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