CN101873446B - Digital receiver and related method thereof - Google Patents
Digital receiver and related method thereof Download PDFInfo
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- CN101873446B CN101873446B CN2009101347564A CN200910134756A CN101873446B CN 101873446 B CN101873446 B CN 101873446B CN 2009101347564 A CN2009101347564 A CN 2009101347564A CN 200910134756 A CN200910134756 A CN 200910134756A CN 101873446 B CN101873446 B CN 101873446B
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Abstract
The invention relates to a digital receiver and a related method thereof. The digital receiver comprises an analog front end circuit, an automatic gain controller, a compensation circuit and a demodulator, wherein the analog front end circuit is used for receiving an input signal, adjusting an average amplitude of the input signal and converting the adjusted input signal according to a control signal to generate a digital signal; the automatic gain controller is used for generating the control signal according to the digital signal and feeding back the control signal to the analog front end circuit; the compensation circuit is used for detecting the average amplitude of the digital signal to generate a detection result, and determining whether to compensate the average amplitude of the digital signal according to the detection result so as to generate a compensated digital signal; and the demodulator is used for demodulating the compensated digital signal to generate an output signal.
Description
Technical field
The present invention relates to digit receiver and its correlation technique; Relate in particular to an a kind of DTV receiver and correlation technique thereof that includes an automatic gain controller, wherein this method is used a detection and compensation mechanism with at this automatic gain controller of demodulation precompensation.
Background technology
At digit receiver (for example: DTV receiver); Automatic gain controller (AutomaticGain Controller; AGC) within input amplitude to a suitable scope that is commonly used to automation ground adjustment digit receiver, in case back-end circuit (such as: demodulator) can normally work.
Yet; Automatic gain controller only has the frequency range (about 1 hertz) that is rather narrow and follows the tracks of the speed of input signal very slow; Therefore; If the amplitude variations of input signal is too fast, then automatic gain controller can can't in time react, and amplitude variations will cause rear end (back-end) circuit to have problems improperly.Therefore, how to overcome above-mentioned problem and become an important topic in this field.
Summary of the invention
One of the object of the invention is to provide a kind of digit receiver and correlation technique thereof that automatic gain is repaid controller that compensate, to solve aforesaid problem.
According to one embodiment of the invention, it provides a kind of digit receiver.This digit receiver includes an analog front circuit, an automatic gain controller, a compensating circuit and a demodulator.This analog front circuit receives a mean amplitude of tide of an input signal and this input signal of foundation one control signal adjustment to produce a digital signal.This automatic gain controller then is coupled to this analog front circuit, in order to produce this control signal to feed back to this analog front circuit according to this digital signal.This compensating circuit is coupled to this analog front circuit, and producing a testing result, and this mean amplitude of tide that whether compensates this digital signal according to this testing result decision is to produce a compensated digital signal in order to the mean amplitude of tide that detects this digital signal.This demodulator is coupled to this compensating circuit, exports signal in order to this compensated digital signal of demodulation to produce one.
According to another embodiment of the present invention, it provides a kind of in order to compensate the method for an automatic gain controller.This method includes following steps: receive an input signal; Adjust a mean amplitude of tide of this input signal and change this adjusted input signal to produce a digital signal according to a control signal of this automatic gain controller, wherein this control signal is based on the signal that this digital signal produces; A mean amplitude of tide that detects this digital signal is to produce a testing result; And this mean amplitude of tide that whether compensates this digital signal according to the decision of this testing result wherein only shows that in this testing result this mean amplitude of tide of this digital signal just can produce this compensating control signal when changing in time to produce a compensated digital signal.
Description of drawings
Fig. 1 is the sketch map of an embodiment of digit receiver of the present invention.
Fig. 2 is for handling the waveform sketch map of the signal that exports back-end circuit to without compensating circuit shown in Figure 1.
Fig. 3 is for handling the waveform sketch map of the signal that exports back-end circuit to through compensating circuit shown in Figure 1.
Fig. 4 is the flow chart of an embodiment of the digital receive method of the automatic gain controller of compensating digits receiver of the present invention.
[main element symbol description]
100 digit receivers
110 analog front circuits
112 analog/digital converters
120 automatic gain controllers
130 compensating circuits
140 demodulators
150 compensators
160 detectors
170 gain controllers
Embodiment
In the middle of specification and appending claims, used some vocabulary to censure specific element.Those skilled in the art should understand, and hardware manufacturer may be called same element with different nouns.This specification and appending claims are not used as distinguishing the mode of element with the difference of title, but the criterion that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of specification and the appending claims in the whole text, so should be construed to " comprise but be not limited to ".In addition, " couple " speech and comprise any indirect means that are electrically connected that directly reach at this.Therefore, be coupled to one second device, then represent this first device can directly be electrically connected in this second device, or be electrically connected to this second device through other devices or the intersegmental ground connection of connection hand if describe one first device in the literary composition.
Please with reference to Fig. 1, Fig. 1 is the sketch map according to an embodiment of digit receiver 100 of the present invention.In this embodiment, digit receiver 100 can be a DTV receiver, but this should not be regarded as the restriction of the scope of the invention.Digit receiver 100 includes (but being not limited to) analog front circuit 110, an automatic gain controller 120, a compensating circuit 130 and a demodulator 140.Analog front circuit 110 receives an input signal SIN, according in the suitable scope of the mean amplitude of tide to of control signal SC adjustment input signal SIN and change this adjusted input signal to produce a digital signal S1.Automatic gain controller 120 is coupled to analog front circuit 110, in order to produce control signal SC to feed back to analog front circuit 110 according to digital signal S1.Compensating circuit 130 is coupled to analog front circuit 110, produces a compensated digital signal S2 in order to a detection and compensation mechanism to be provided with the mean amplitude of tide of compensated digital signal S1.Demodulator 140 is coupled to compensating circuit 130 and produces an output signal SOUT with demodulation compensated digital signal S2.
In this embodiment, compensating circuit 130 includes a compensator 150, a detector 160 and a gain controller 170.The mean amplitude of tide that detector 160 detects digital signal S1 is to produce a testing result DR.170 of gain controllers are coupled to compensator 150 and detector 160, give compensator 150 in order to produce a compensating control signal Sd according to testing result DR.Compensator 150 receiving digital signals S1 and the mean amplitude of tide that comes compensated digital signal S1 according to compensating control signal Sd are to produce compensated digital signal S2.At last, compensated digital signal S2 is input to demodulator 140 and exports signal SOUT by demodulator 140 demodulation to produce.Note that compensating circuit 130 is that mode with digital circuit realizes at this, but scope of the present invention is not limited to this.
Usually, the mean amplitude of tide S 1 of digital signal S1 can be by feedback to adjust to the mean amplitude of tide of input signal SIN within one proper range through automatic gain controller 120.For instance, if do not pass through the adjustment of automatic gain controller 120, then the digital signal S1 that exported of analog front circuit 110 may violent variation between the signal of weak the last one; Yet; Automatic gain controller 120 only has the frequency range (about 1 hertz) and the speed of tracking signal that are rather narrow very slow; If the mean amplitude of tide of input signal SIN changes fast greatly; Automatic gain controller 120 can become and can't in time react, and amplitude variations tends to cause back-end circuit (for example: demodulator 140) have problems improperly.So; The present invention added compensating circuit 130 before demodulator 140; Because the compensating circuit 130 that is added is designed to bigger frequency range and can comes tracking signal with very fast speed, so compensating circuit 130 can continue to detect the mean amplitude of tide of digital signal S1 and in time digital signal S1 is compensated.
Please with reference to Fig. 2 and Fig. 3.Fig. 2 is for handling the waveform sketch map of the signal that exports demodulator 140 to without compensating circuit shown in Figure 1 130, Fig. 3 then is the waveform sketch map that after compensating circuit shown in Figure 1 130 is handled, exports the signal of demodulator 140 to.For instance; If being the mean amplitude of tide of a stabilization signal and digital signal S1, input signal SIN maintains 80; This situation can represent with the curve C among Fig. 21, on the other hand, if input signal SIN has the cyclic variation signal of 100 hertz of frequencies and automatic gain controller 120 can't in time react; Then the mean amplitude of tide of digital signal S1 also can have the cyclic variation of 100 hertz of frequencies, and this situation can be represented with the curve C among Fig. 22.This periodic amplitude variations may throw into question in back-end circuit.
As shown in Figure 3, curve C 3 representative is in order to the compensating control signal Sd of the mean amplitude of tide of compensated digital signal S1, wherein compensating control signal Sd with 100 hertz frequency and periodically compensated digital signal S1 produce compensated digital signal S2.In addition, curve C 2 ' exports the mean amplitude of tide of the compensated digital signal S2 that passes through compensation deals of demodulator 140 in order to representative.With Fig. 2 by comparison, the amplitude variations degree of curve C 2 ' after compensation is much smaller than curve C 2, therefore, the treatment effeciency of back-end circuit and accuracy also can thereby improve.
Please note; The foregoing description is only as narration example of the present invention, and unrestricted scope of the present invention, and those skilled in the art should understand; Under the situation of spirit of the present invention, the various variations that compensating circuit 130 is made still belong within the scope of the present invention.
Please with reference to Fig. 4, Fig. 4 is the flow chart of an embodiment of the digital receive method that compensates automatic gain controller according to the present invention.If can reach identical result substantially, the sequence of steps that does not need necessarily to abide by in the flow process shown in Figure 4 is carried out, and step shown in Figure 4 not necessarily will carry out continuously, that is other steps also can be inserted wherein.Digital receive method of the present invention includes (but being not limited to) following steps:
Step 402: beginning.
Step 404: receive an input signal, then execution in step 406.
Step 406: adjust a mean amplitude of tide of this input signal, and convert adjusted input signal into a digital signal according to a control signal of automatic gain controller.
Step 410: produce this control signal according to this digital signal, then get back to step 406.
Step 420: a mean amplitude of tide that detects this digital signal is followed execution in step 422 to produce a testing result.
Step 422: the mean amplitude of tide that determines whether compensating this digital signal according to this testing result is to produce a compensated digital signal.If this testing result shows the mean amplitude of tide of this digital signal along with the time changes, then execution in step 430; Otherwise, execution in step 440.
Step 430: produce a compensating control signal according to this testing result, then execution in step 432.
Step 432: the mean amplitude of tide that compensates this digital signal according to this compensating control signal is followed execution in step 450 to produce this compensated digital signal.
Step 440: the mean amplitude of tide of this digital signal of uncompensation, then execution in step 450.
Step 450: this compensated digital signal of demodulation is to produce an output signal.
Please consult Fig. 1 and Fig. 4 simultaneously.Following summary of the invention has detailed the running that cooperates of each element among each step shown in Figure 4 and Fig. 1.In step 404～406, analog front circuit 110 receiving inputted signal SIN, the mean amplitude of tide of adjustment input signal SIN and this adjusted input signal of conversion are to produce digital signal S1.In step 410, automatic gain controller 120 produces control signal SC according to digital signal S1.130 of compensating circuits are carried out following step 420～440.Detector 160 detects the mean amplitude of tide of digital signal to produce testing result DR (step 420); When if the mean amplitude of tide of testing result DR display digit signal S1 changed along with the time; Then gain controller 170 can produce compensating control signal Sd (step 430), then compensator 150 just come compensated digital signal S1 according to compensating control signal Sd mean amplitude of tide (step 432) to produce compensated digital signal S2; On the other hand, if the mean amplitude of tide of digital signal S1 is stable, then close the function (step 440) of compensator 150.At last, the compensated digital signal S2 (step 450) that exported of demodulator 140 demodulation compensating circuits 130 is to produce output signal SOUT.
Each above-mentioned embodiment is all only as the usefulness of example explanation of the present invention, and should not be regarded as the restrictive condition of scope of the present invention.In sum, the mechanism that the invention provides the compensation of a kind of applying detection compensates the method and apparatus of automatic gain controller.Use the disclosed method of the present invention; The mean amplitude of tide of compensating circuit 130 sustainable detection digital signal S1 also compensates digital signal S1 in time; Even if the mean amplitude of tide of input signal S1 changes extremely violent and automatic gain controller 120 can't in time react; Yet this mechanism still can overcome the aforementioned problem that runs into, so the treatment effeciency of back-end circuit and accuracy also can thereby be improved.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claims of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. digit receiver includes:
One analog front circuit in order to receive an input signal, is adjusted a mean amplitude of tide of this input signal and is changed this adjusted input signal to produce a digital signal according to a control signal;
One automatic gain controller is coupled to this analog front circuit, in order to produce this control signal to feed back to this analog front circuit according to this digital signal;
One compensating circuit is coupled to this analog front circuit, and producing a testing result, and this mean amplitude of tide that whether compensates this digital signal according to this testing result decision is to produce a compensated digital signal in order to the mean amplitude of tide that detects this digital signal; And
One demodulator is coupled to this compensating circuit, exports signal in order to this compensated digital signal of demodulation to produce one.
2. digit receiver as claimed in claim 1, wherein this compensating circuit includes:
One compensator, in order to this mean amplitude of tide of receiving this digital signal and compensating this digital signal according to a compensating control signal to produce this compensated digital signal;
One detector, in order to this mean amplitude of tide of detecting this digital signal to produce this testing result; And
One gain controller is coupled to this compensator and this detector, gives this compensator in order to produce this compensating control signal according to this testing result.
3. digit receiver as claimed in claim 2, wherein this gain controller only shows that in this testing result this mean amplitude of tide of this digital signal just can produce this compensating control signal and give this compensator when changing along with the time.
4. digit receiver as claimed in claim 1, wherein this compensating circuit is realized the frequency range that comes widely with the frequency range that has than this automatic gain controller with the mode of digital circuit.
5. digit receiver as claimed in claim 1, wherein this digit receiver is a DTV receiver.
6. one kind in order to compensate the digital receive method of an automatic gain controller in the digit receiver, includes:
Receive an input signal; Adjust a mean amplitude of tide of this input signal and change this adjusted input signal to produce a digital signal according to a control signal of this automatic gain controller, wherein this control signal is based on the signal that this digital signal produces;
A mean amplitude of tide that detects this digital signal is to produce a testing result;
This mean amplitude of tide that whether compensates this digital signal according to the decision of this testing result is to produce a compensated digital signal; And
This compensated digital signal of demodulation is to produce an output signal.
7. method as claimed in claim 6, this mean amplitude of tide that wherein whether compensates this digital signal according to this testing result decision includes with the step that produces this compensated digital signal:
Produce a compensating control signal according to this testing result; And
According to this mean amplitude of tide of this digital signal of this compensating control signal compensation to produce this compensated digital signal.
8. method as claimed in claim 7 wherein only shows that in this testing result this mean amplitude of tide of this digital signal just can produce this compensating control signal when changing along with the time.
9. method as claimed in claim 7, the step that wherein compensates this mean amplitude of tide of this digital signal realizes so that its running speed is come soon than this automatic gain controller with digital form.
10. method as claimed in claim 7, it is applied to a DTV receiver.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101347564A CN101873446B (en) | 2009-04-22 | 2009-04-22 | Digital receiver and related method thereof |
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| CN2009101347564A CN101873446B (en) | 2009-04-22 | 2009-04-22 | Digital receiver and related method thereof |
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| CN101873446A CN101873446A (en) | 2010-10-27 |
| CN101873446B true CN101873446B (en) | 2012-05-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450770A (en) * | 2002-04-10 | 2003-10-22 | 松下电器产业株式会社 | Nonlinear distortion compensator |
| CN1523768A (en) * | 2003-02-19 | 2004-08-25 | 联发科技股份有限公司 | Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus |
| CN1691660A (en) * | 2004-04-21 | 2005-11-02 | 富士通株式会社 | Quadrature modulation system |
| CN1736101A (en) * | 2002-09-18 | 2006-02-15 | 多特卡斯特公司 | Adaptive expanded information capacity for television communications systems |
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2009
- 2009-04-22 CN CN2009101347564A patent/CN101873446B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450770A (en) * | 2002-04-10 | 2003-10-22 | 松下电器产业株式会社 | Nonlinear distortion compensator |
| CN1736101A (en) * | 2002-09-18 | 2006-02-15 | 多特卡斯特公司 | Adaptive expanded information capacity for television communications systems |
| CN1523768A (en) * | 2003-02-19 | 2004-08-25 | 联发科技股份有限公司 | Method for eliminating mirror image interference in low-intermediate frequency receiver and relevant apparatus |
| CN1691660A (en) * | 2004-04-21 | 2005-11-02 | 富士通株式会社 | Quadrature modulation system |
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| CN101873446A (en) | 2010-10-27 |
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