CN100490499C - Spke noise suppressor and its method - Google Patents
Spke noise suppressor and its method Download PDFInfo
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- CN100490499C CN100490499C CNB200610009600XA CN200610009600A CN100490499C CN 100490499 C CN100490499 C CN 100490499C CN B200610009600X A CNB200610009600X A CN B200610009600XA CN 200610009600 A CN200610009600 A CN 200610009600A CN 100490499 C CN100490499 C CN 100490499C
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Abstract
The burst noise suppressor includes adjustable gain amplification unit (AGAU), burst detection unit, burst suppression unit, and automatic gain control unit. Based on peak flat ratio, the automatic gain control unit decides gain value. AGAU magnifies received signal by using the gain value. The gain value is so decided that in ideal case when received signal is not influenced by burst noise, the amplitude range is smaller than prearranged range. The burst detection unit decides whether the magnified received signal is larger than maximum value of the prearranged range; if yes, outputting signal of guarding burst. If receiving the signal of guarding burst, the burst suppression unit restrains burst noise, and then outputs an output signal.
Description
Technical field
The invention relates to a kind of checkout gear of impulsive noise, and particularly relevant for a kind of impulse noise detection devices and methods therefor that is applied to DTV receiver.
Background technology
Digital television system compare down the program channel that can transmit more high image quality with traditional simulated television system, and its anti-multipath interference capability is good owing to be the mode that adopts the digitalization compressed signal, therefore can reduce ghost image, promotes picture quality.Digital television system has all size, for example is the DVB (Digital Video Broadcast) of Europe rule, the ATSC (Advanced TelevisionSystems Committee) of U.S. rule and the ISDB (Integrated Services DigitalBroadcasting) of sundial etc.
Being transformed into transition period of digital television system in the simulated television system, is to be provided with set-top box in the general family, and built-in DTV receiver is with the signal of receiving digital television program.But the source that many impulsive noises are arranged in the home environment influences the signal of digital television program, and then influences the quality of picture.
The source of impulsive noise for example is electrical appliances such as the refrigerator, television set, microwave oven in the family.Therefore the interference that reduces impulsive noise is the target that the manufacturer of DTV receiver endeavours.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of impulse noise suppressor and method thereof that is applied to DTV receiver is being provided.
According to purpose of the present invention, a kind of impulse noise suppressor is proposed.Impulse noise suppressor comprises that adjustable gain amplifying unit, pulse detecting unit, pulse suppress unit and automatic gain control unit.Automatic gain control unit determines yield value according to peak-to-average ratio.The adjustable gain amplifying unit amplifies received signal with yield value.The decision of yield value is to make not to be subjected to impulse noise effect ideally in received signal that its amplitude range is less than preset range.Whether pulse detecting unit determines this amplification received signal greater than the maximum of preset range, if then export the pulse alarm signal.Pulse suppresses the unit if receive then suppressor pulse noise of this pulse alarm signal, exports an output signal then.
According to another object of the present invention, a kind of impulse noise suppression method is proposed, be used for DTV receiver.The method at first according to the characteristic of predetermined received signal, is estimated its peak-to-average ratio, and is determined yield value in view of the above.Receive a received signal then.Then, with this yield value received signal is amplified, the decision system of this yield value makes and is not subjected to impulse noise effect ideally in received signal that the amplitude range of the received signal of amplification is less than preset range.Then, decision is amplified received signal whether greater than the maximum of preset range, if then export the pulse alarm signal.Then, if receive then suppressor pulse noise of pulse alarm signal, export an output signal then.
According to another object of the present invention, a kind of impulse noise suppressor is also proposed, comprise: automatic gain control unit, according to peak-to-average ratio decision yield value, the adjustable gain amplifying unit, amplify received signal with this yield value, the decision of this yield value is to make not to be subjected to impulse noise effect ideally in this received signal that the amplitude range of the received signal of this amplification is less than preset range; Analog digital converting unit, in order to the received signal that digitlization should be amplified, to produce digital signal, wherein this preset range is less than the maximum dynamically input range of this analog digital converting unit; Pulse detecting unit is coupled to this analog digital converting unit, and whether to determine this digital signal greater than the maximum number signal, if then export the pulse alarm signal, wherein this maximum number signal gets for the maximum institute digitlization of this preset range; And pulse inhibition unit, receive this amplification received signal, if receive then suppressor pulse noise of this pulse alarm signal, export an output signal then.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 illustrates the calcspar according to a kind of DTV receiver of a preferred embodiment of the present invention.
Fig. 2 illustrates the calcspar of impulse noise suppressor.
Fig. 3 A illustrates the input range schematic diagram into analog-digital converter 204.
Fig. 3 B illustrates the schematic diagram into the digital signal D after the analog digital conversion.
Fig. 4 is the flow chart of the method for impulse noise suppressor.
[main element label declaration]
100: DTV receiver
110: impulse noise suppressor
120: the demodulate/decode device
202: the adjustable gain amplifying unit
204: analog digital converting unit
206: pulse detecting unit
208: pulse suppresses the unit
210: automatic gain control unit
Embodiment
Please refer to Fig. 1, it illustrates the calcspar according to a kind of DTV receiver of a preferred embodiment of the present invention.DTV receiver 100 is the signal I that receives the specification of DVB-T for example, will go out to TV after it decoding.Standard with the DVB-T of Europe rule, it is to adopt OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is with the signal of emission Digital Television, (Peak-to-Average Power Ratio is can estimate in advance according to the characteristic of received signal PAPR) to the peak-to-average ratio of this signal.Present embodiment promptly is to utilize peak-to-average ratio and the gain amplifier that determines signal I, and whether the signal I that is beneficial to detect reception is subjected to the influence of impulsive noise.
Fig. 2 illustrates the calcspar of impulse noise suppressor.Impulse noise suppressor 110 comprises automatic gain control unit 210 (Automatic Gain Controller, AGC), adjustable gain amplifying unit 202 (Variable Gain Amplifier, VGA), analog digital converting unit 204 (Analog-to-Digital Converter, ADC), pulse detecting unit 206 and pulse suppress unit 208.Automatic gain control unit 210 is yield values of adjusting adjustable gain amplifying unit 202 according to the peak-to-average ratio of estimating according to predetermined received signal in advance (PAPR).Variable gain amplifier 202 produces amplification input signal Ia according to this yield value, wherein the decision of yield value is to make the maximum magnitude of the amplification input signal Ia be not subjected to impulse noise effect ideally less than preset range, and this preset range is less than the maximum dynamically input range of analog-digital converter 204.Analog-digital converter 204 transfers amplification input signal Ia to digital signal D.
Digital signal D is inputed to pulse detecting unit 206 and pulse simultaneously and is suppressed unit 208.Whether pulse detecting unit 206 is greater than the maximum number signal after the maximum institute digitlization of this preset range in order to the digital signal D that imported of decision analog-digital converter 204, influenced by impulsive noise if then represent input signal I system, and output pulse alarm signal W.Pulse suppresses unit 208 receiving digital signals D, if also receive pulse alarm signal W simultaneously, and then suppressor pulse noise, and output video digital signal Di, otherwise digital signal D is also exported as video signal Di.
Present embodiment is a yield value of adjusting adjustable gain amplifying unit 202 by peak-to-average ratio (PAPR), make the scope of the amplification input signal Ia be not subjected to impulse noise effect ideally less than preset range, and the decision of preset range is to make its maximum dynamically input range less than analog-digital converter 204.Ask for an interview Fig. 3 A, it illustrates the input range schematic diagram into analog-digital converter 204.The maximum dynamically input range of analog-digital converter 204 is between-the X between+X; Control by automatic gain control unit 210 can be so that the signal Ia that adjustable gain amplifying unit 202 is exported be subjected under the impulse noise effect, less than this between+Y to the preset range the between-Y.
Ask for an interview Fig. 3 B, it illustrates the schematic diagram into the digital signal D of process digital-to-analogue conversion.Digital signal D is that design has 0 to N position, and (Most significant Bit MSB) is sign bit (sign bit) S to its highest significant position, the expression plus or minus.By suitable adjustment, make analog digital converting unit 204 to convert the maximum number signal to the maximum of the preset range the between-Y between+Y, it is 0 to (i-1) individual position that the individual position of its i to the (N-1) is all 1, the 0.(N-i-1) the altogether individual position that just indicates among Fig. 3 B is 1, and the i of back position is 0.
The digital signal D that received signal I changed into that is not subjected to impulse noise effect is less than or equal to the maximum number signal, otherwise when received signal I was coupled with impulsive noise, the digital signal D that is drawn just might be greater than the maximum number signal.That is to say, when the individual position of the i to the of digital signal D (N-1) is all 1,, represent that then digital signal D is greater than the maximum number signal if the 0th arbitrary position to be arranged in (i-1) individual position be 1.
Therefore, so whether the pulse detecting unit 206 check dight signal D of present embodiment if then expression need carry out the inhibition processing of impulsive noise, send pulse alarm signal W to pulse suppress unit 208 greater than the maximum number signal.
After pulse alarm signal W is received in pulse inhibition unit 208, promptly adopt pulse and suppress, as digital signal D being reduced to minimum (blanking), for example its position is 0 entirely, or transfers to saturation value, just this maximum number signal.
Fig. 4 is the flow chart of the method for impulse noise suppressor.At first, in step 401,, estimate its peak-to-average ratio, and determine yield value in view of the above according to the characteristic of predetermined received signal.In step 403, received signal I amplifies received signal I with this yield value, amplifies received signal Ia to produce.In step 405, will amplify received signal Ia and transfer digital signal D to.Then, in step 407, whether D is greater than the maximum number signal for the decision digital signal, if then enter step 409 with output pulse alarm signal, suppressor pulse noise in step 411 then.If digital signal D then enters step 413 with direct generation output signal, just video signal Di less than the maximum number signal.
Disclosed DTV receiver of the above embodiment of the present invention and impulse noise suppressor thereof and method can detect the influence of impulsive noise and effectively with it elimination, therefore the quality that can promote picture and sound effectively.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (12)
1. impulse noise suppressor comprises:
Automatic gain control unit, according to peak-to-average ratio decision yield value,
The adjustable gain amplifying unit amplifies received signal with this yield value, and the decision of this yield value is to make not to be subjected to impulse noise effect ideally in this received signal that the amplitude range of the received signal of this amplification is less than preset range;
Analog digital converting unit is coupled to the received signal of this adjustable gain amplifying unit with this amplification of digitlization, and to produce digital signal, wherein this preset range is less than the maximum dynamically input range of this analog digital converting unit;
Pulse detecting unit is coupled to this analog digital converting unit, and whether to determine this digital signal greater than the maximum number signal, if then export the pulse alarm signal, wherein this maximum number signal gets for the maximum institute digitlization of this preset range; And
Pulse suppresses the unit, is coupled to this analog digital converting unit, receives this digital signal, if receive then suppressor pulse noise of this pulse alarm signal, exports an output signal then.
2. inhibitor according to claim 1, wherein this received signal is the signal that meets the Digital Television Terrestrial Broadcasting specification.
3. inhibitor according to claim 1, wherein this received signal is modulated by orthogonal frequency division multiplexi.
4. inhibitor according to claim 1 wherein when this pulse inhibition unit receives this pulse alarm signal, makes this output signal blank.
5. inhibitor according to claim 1, wherein when this pulse suppresses unit and receives this pulse alarm signal, with the maximum of this preset range as this output signal.
6. inhibitor according to claim 1, wherein when this pulse suppresses unit and does not receive this pulse alarm signal, with this digital signal as this output signal.
7. an impulse noise suppression method is used for DTV receiver, and this method comprises
According to the characteristic of predetermined received signal, estimate peak-to-average ratio, and determine yield value in view of the above;
Receive a received signal;
With this yield value this received signal is amplified, the decision of this yield value is to make not to be subjected to impulse noise effect ideally in this received signal that the amplitude range of the received signal of this amplification is less than preset range;
The received signal that digitlization should be amplified, whether to determine this digital signal greater than the maximum number signal, if then export the pulse alarm signal, wherein this maximum number signal gets for the maximum institute digitlization of this preset range; And
If receive then suppressor pulse noise of this pulse alarm signal, export an output signal then.
8. method according to claim 7, wherein this received signal is the signal that meets the Digital Television Terrestrial Broadcasting specification.
9. method according to claim 7, wherein this received signal is modulated by orthogonal frequency division multiplexi.
10. method according to claim 7 wherein in the step of this output signal of output, if receive this pulse alarm signal, makes this output signal blank.
11. method according to claim 7, wherein in the step of this output signal of output, if receive this pulse alarm signal, with the maximum of this preset range as this output signal.
12. method according to claim 7, wherein in the step of this output signal of output, if do not receive this pulse alarm signal, with this digital signal as this output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610009600XA CN100490499C (en) | 2006-02-24 | 2006-02-24 | Spke noise suppressor and its method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610009600XA CN100490499C (en) | 2006-02-24 | 2006-02-24 | Spke noise suppressor and its method |
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| Publication Number | Publication Date |
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| CN101026687A CN101026687A (en) | 2007-08-29 |
| CN100490499C true CN100490499C (en) | 2009-05-20 |
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| CNB200610009600XA Expired - Fee Related CN100490499C (en) | 2006-02-24 | 2006-02-24 | Spke noise suppressor and its method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101179283B (en) * | 2007-09-28 | 2011-01-12 | 杭州国芯科技股份有限公司 | Method of detecting and suppressing pulse noise |
| CN110912570B (en) * | 2019-11-18 | 2021-07-06 | 展讯通信（上海）有限公司 | Gear shifting device and method of low noise amplifier, terminal and network element equipment |
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