CN102186002A - Method and system for television noise reduction and television - Google Patents
Method and system for television noise reduction and television Download PDFInfo
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- CN102186002A CN102186002A CN 201110057260 CN201110057260A CN102186002A CN 102186002 A CN102186002 A CN 102186002A CN 201110057260 CN201110057260 CN 201110057260 CN 201110057260 A CN201110057260 A CN 201110057260A CN 102186002 A CN102186002 A CN 102186002A
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Abstract
The invention provides a method and a system for television noise reduction,and a television, applicable to the field of TV technology. The method comprises the following steps: obtaining Single to Noise Ratio (SNR) of television signals, determining if the obtained SNR changes; and dynamically adjusting intensity of a noise reduction circuit accordingly when the SNR changes. By dynamically adjusting the intensity of a noise reduction circuit when the SNR of television signals changes, the method realizes automatic detection of SNR, automatic switch of the intensity of the noise reduction circuit, and improves user's experience.
Description
Technical field
The invention belongs to TV technology, relate in particular to a kind of method, system and television set of TV noise reduction.
Background technology
Along with the end of financial crisis, the improving constantly of world's people's living standard, the continuing to increase of overseas European market order, television set is sold for more and more countries as the indispensable household electrical appliances of life.TV reception is still come with antenna now in a lot of foreign countries and area, the signal less stable that will become like this, and sometimes TV programme is very clear, and sometimes TV programme is very fuzzy, a lot of noises occur.
In order to overcome the above problems, all integrated Dolby circuit in the television set master chip, the principle of Dolby circuit is the noise that the definition of sacrifice TV programme reduces TV programme, control the switch and the intensity of Dolby circuit by the register among the corresponding main MCU, the TV software designers can increase the project of a noise reduction in menu then, this project provides pass, basic, normal, high 4 kinds of selections to select for the user, selects the intensity of corresponding Dolby circuit.More weak such as signal of TV program, when noise is big especially, just need be set to height by noise reduction, otherwise more intense when signal of TV program, when image does not have noise, just should be set to the pass by noise reduction, by regulating decrease of noise functions, just can allow the user see satisfied TV programme.
Yet also there is following problem in existing TV noise reduction technology:
1. a lot of users do not understand the effect of decrease of noise functions, so they can not regulate, have so just caused the setting of decrease of noise functions and TV programme inconsistent, such as a lot of noises are arranged during current television signal, but decrease of noise functions is closed again.
2. the fraction user knows the effect of decrease of noise functions, but as long as variation has taken place in the vision signal of TV programme, the user just need go out the decrease of noise functions in the actions menu, and decrease of noise functions is switched in frequent the going of also being unwilling of the hell to pay of Xianing, and user like this in the menu.
Therefore the method for prior art TV noise reduction needs user's manual adjustment, influences the effect of watching of TV programme, even can cause user's complaint.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method of TV noise reduction, and the TV noise-reduction method that is intended to solve prior art needs user's manual adjustment, influences the effect problem of watching of TV programme.
The embodiment of the invention is achieved in that a kind of method of TV noise reduction, and described method comprises the steps:
Obtain the signal to noise ratio of TV signal;
Judge whether the described signal to noise ratio of obtaining changes;
When described signal to noise ratio changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes.
The embodiment of the invention also provides a kind of system of TV noise reduction, and described system comprises:
The signal to noise ratio acquiring unit is used to obtain the signal to noise ratio of TV signal;
Judging unit is used to judge whether the signal to noise ratio that described signal to noise ratio acquiring unit obtains changes;
Adjustment unit is used for when the described signal to noise ratio of described judgment unit judges changes, and dynamically adjusts the intensity of Dolby circuit according to the signal to noise ratio that changes.
The embodiment of the invention also provides a kind of television set, and described television set comprises the system of above-mentioned TV noise reduction.
In embodiments of the present invention, by when the signal to noise ratio of judging TV signal changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes, realized automatic detection signal-to-noise ratio, the intensity of automatic switchover Dolby circuit gives the user with favorable user experience, has improved the market competitiveness.
Description of drawings
Fig. 1 is the flow chart of realization of the method for the TV noise reduction that provides of the embodiment of the invention one;
Fig. 2 is the flow chart of the realization of the signal to noise ratio of obtaining TV signal that provides of the embodiment of the invention two;
Fig. 3 is whether the signal to noise ratio obtained of judgement that the embodiment of the invention three provides is at the flow chart of the realization that has taken place to change;
Fig. 4 is the flow chart of the realization of the realization example that provides of the embodiment of the invention four;
Fig. 5 is the structure chart of the system of the TV noise reduction that provides of the embodiment of the invention five;
Fig. 6 is the structure chart of the system of the TV noise reduction that provides of the embodiment of the invention six.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The signal to noise ratio of the embodiment of the invention by obtaining according to judgement, and when the signal to noise ratio of TV signal changes, dynamically adjust the intensity of Dolby circuit, having realized automatic detection signal-to-noise ratio, the intensity of automatic switchover Dolby circuit gives the user with favorable user experience.
The embodiment of the invention is achieved in that a kind of method of TV noise reduction, and described method comprises the steps:
Obtain the signal to noise ratio of TV signal;
Judge whether the described signal to noise ratio of obtaining changes;
When described signal to noise ratio changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes.
The embodiment of the invention also provides a kind of system of TV noise reduction, and described system comprises:
The signal to noise ratio acquiring unit is used to obtain the signal to noise ratio of TV signal;
Judging unit is used to judge whether the signal to noise ratio that described signal to noise ratio acquiring unit obtains changes;
Adjustment unit is used for when the described signal to noise ratio of described judgment unit judges changes, and dynamically adjusts the intensity of Dolby circuit according to the signal to noise ratio that changes.
The embodiment of the invention also provides a kind of television set, and described television set comprises the system of above-mentioned TV noise reduction.
In embodiments of the present invention, by when the signal to noise ratio of judging TV signal changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes, realized automatic detection signal-to-noise ratio, the intensity of automatic switchover Dolby circuit gives the user with favorable user experience, has improved the market competitiveness.
Below in conjunction with specific embodiment realization of the present invention is described in detail:
Embodiment one
Fig. 1 shows the flow chart of realization of the method for the TV noise reduction that the embodiment of the invention one provides, and details are as follows:
In step S101, obtain the signal to noise ratio of TV signal.
In embodiments of the present invention, detecting signal to noise ratio circuit is as the custom circuit of television set, be built among the main IC in the TV, therefore, can obtain the signal to noise ratio of current received television signal by the signal to noise ratio circuit that main IC chip is obtained in monitoring, when radiofrequency signal enters into master chip by tuner, at first radiofrequency signal is by the signal to noise ratio circuit in the main IC chip, the signal to noise ratio circuit feeds back to the value of the signal to noise ratio of acquisition the read-only register of main IC, thereby obtain the signal to noise ratio scope of current television signal, the unit that obtains signal to noise ratio is decibel dB.
In step S102, judge whether the signal to noise ratio of obtaining changes, when described signal to noise ratio changes, execution in step S103.
In embodiments of the present invention, specifically can realizing in the following manner of step S102:
A, judge whether the value of the current signal to noise ratio of obtaining equates with the value of the preceding signal to noise ratio of once obtaining.
If the value of the current signal to noise ratio of obtaining of B and the value of the preceding signal to noise ratio of once obtaining are unequal, judge that then the signal to noise ratio of TV signal changes, otherwise do not change.
In step S103, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes.
In embodiments of the present invention, whether the signal to noise ratio of obtaining TV signal by judgement changes, when the signal to noise ratio of TV signal changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes, realized automatic detection signal-to-noise ratio, the intensity of automatic switchover Dolby circuit gives the user with favorable user experience, has improved the market competitiveness.
Embodiment two
Fig. 2 shows the flow chart of realization that the embodiment of the invention is obtained the signal to noise ratio of TV signal, and details are as follows:
In step S201, calculate the local variance of each picture element in the TV signal that receives.
In step S202, with the maximum of local variance as signal variance, with the minimum value of local variance as noise variance.
In step S203, calculate the signal to noise ratio of received signal, wherein: the signal to noise ratio=signal variance of received signal/noise variance.
In embodiments of the present invention, for convenience, usually converting to the value of the signal to noise ratio that calculates with decibel (dB) accordingly is the value of unit.
In embodiments of the present invention, by with the maximum of local variance as signal variance, the minimum value of local variance as noise variance, and then is obtained the signal to noise ratio of received signal, method is simple, convenient.
Embodiment three
In embodiments of the present invention, because TV signal generally has certain stabilization time, so judge accurately in order to make whether signal to noise ratio changes, can adopt repeatedly judgment mode and determine whether signal to noise ratio changes, specifically can adopt the method for digital filtering to realize, its specific implementation process is as follows, sees also Fig. 3:
In step S301, whether the value of judging the current signal to noise ratio of obtaining equates with the value of the preceding signal to noise ratio of once obtaining, when the value of judging the current signal to noise ratio of obtaining equates with the value of the preceding signal to noise ratio of once obtaining, execution in step S301, when the value of the value of judging the current signal to noise ratio of obtaining and the preceding signal to noise ratio of once obtaining is unequal, execution in step S302.
In step S302, judge whether the value of the above-mentioned current signal to noise ratio of obtaining equates with the value of the signal to noise ratio of obtaining for N time afterwards, wherein N 〉=2.
In step S303, if the value of the described current signal to noise ratio of obtaining equate with the value of the signal to noise ratio of obtaining for N time afterwards, judge that then the signal to noise ratio of TV signal changes, if unequal, the TV signal instability of Jie Shouing then, execution in step S301.
In embodiments of the present invention, the N value can be provided with different values according to the situation of user's practical application, at this not in order to restriction the present invention.
In embodiments of the present invention, the time that general TV signal is stable is about 2s, in actual implementation process, the time of judging 100 times continuously is for being approximately 2s, therefore, the N value can get 100, promptly according to judging that 100 times result judges whether signal to noise ratio changes continuously.
In embodiments of the present invention, whether change, can improve the accuracy of judgement, thereby avoid influencing user's viewing effect because of erroneous judgement causes follow-up adjustment mistake by the signal to noise ratio of repeatedly judging received signal.
Embodiment four
In embodiments of the present invention, specifically may further comprise the steps of step S103:
C, according to the default signal to noise ratio and the intensity corresponding relation of Dolby circuit, search the intensity of Dolby circuit of the signal to noise ratio correspondence of variation.
In embodiments of the present invention, the default signal to noise ratio and the intensity corresponding relation of Dolby circuit are many-one, promptly can the value of a plurality of signal to noise ratios is corresponding with the intensity of a Dolby circuit, and also can an interval of signal to noise ratio is corresponding with the intensity of a Dolby circuit.
The intensity of D, adjustment Dolby circuit is the intensity of the described Dolby circuit of searching.
For the ease of understanding, with a concrete realization example embodiment of the invention is described below, wherein, an interval of signal to noise ratio is corresponding with the intensity of a Dolby circuit, be provided with three intervals altogether, respectively with Dolby circuit strong, neutralization is low corresponding, but is not limited to this realization example, sees also Fig. 4:
In step S401,, search the intensity of Dolby circuit of the signal to noise ratio correspondence of variation according to the default signal to noise ratio and the intensity corresponding relation of Dolby circuit.
In step S402, when the value of the signal to noise ratio that changes is positioned at first interval, promptly when the snr value of variation during less than 35dB, execution in step S403, otherwise execution in step S404.
In step S403, the intensity of Dolby circuit is adjusted into by force.
In step S404, when the value of the signal to noise ratio that changes is positioned at second interval, promptly when the snr value that changes greater than 35dB, during less than 50dB, execution in step S405, otherwise execution in step S406.
In step S405, during the intensity of Dolby circuit is adjusted into.
In step S406, when the value of the signal to noise ratio that changes is positioned at the 3rd interval, promptly when the snr value that changes greater than 50dB, during less than 65dB, execution in step S407, otherwise execution in step S408.
In step S407, be adjusted into the intensity of Dolby circuit low.
In step S408, close Dolby circuit.
The embodiment of the invention is by according to the default signal to noise ratio and the intensity corresponding relation of Dolby circuit, searches the intensity of Dolby circuit of the signal to noise ratio correspondence of variation, and adjusts the intensity of Dolby circuit according to lookup result, improved the accuracy of judgement.
Embodiment five
Fig. 5 shows the structure chart of the system of the TV noise reduction that the embodiment of the invention five provides, for convenience of explanation, only show the part relevant with the embodiment of the invention, this device can be software unit, hardware cell or the soft or hard combining unit that is built in the television set.
In embodiments of the present invention, the system of TV noise reduction specifically comprises:
Signal to noise ratio acquiring unit 51 obtains the signal to noise ratio of TV signal.
Judging unit 52 judges whether the signal to noise ratio that signal to noise ratio acquiring unit 51 obtains changes.
In embodiments of the present invention, judging unit 52 specifically can be realized in the following manner:
A, judge whether the value of the current signal to noise ratio of obtaining equates with the value of the preceding signal to noise ratio of once obtaining.
If the value of the current signal to noise ratio of obtaining of B and the value of the preceding signal to noise ratio of once obtaining are unequal, judge that then variation has taken place the signal to noise ratio of TV signal, otherwise do not change.
When adjustment unit 53 judges that when judging unit 52 variation has taken place signal to noise ratio, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes.
In embodiments of the present invention, whether the signal to noise ratio of the TV signal of obtaining by judgment unit judges signal to noise ratio acquiring unit changes, when the signal to noise ratio of TV signal changes, adjustment unit is dynamically adjusted the intensity of Dolby circuit according to the signal to noise ratio that changes, realized automatic detection signal-to-noise ratio, the intensity of automatic switchover Dolby circuit gives the user with favorable user experience, has improved the market competitiveness.
Embodiment six
Fig. 6 shows the structure chart of the system of the TV noise reduction that the embodiment of the invention six provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
In embodiments of the present invention, signal to noise ratio acquiring unit 61 can comprise:
The maximum of the local variance that variance determination module 612 calculates computing module 611 is as signal variance, with the minimum value of local variance as noise variance;
In embodiments of the present invention, for convenience, usually converting to the value of the signal to noise ratio that calculates with decibel (dB) accordingly is the value of unit.
Embodiment seven
In embodiments of the present invention, judging unit 62 specifically can comprise:
When second judge module 622 judges that when first judge module 621 value of the value of the current signal to noise ratio of obtaining and the preceding signal to noise ratio of once obtaining is unequal, judge whether the value of the current signal to noise ratio of obtaining equates with the value of the signal to noise ratio of obtaining for N time afterwards, if equate, judge that then signal to noise ratio changes, wherein N 〉=2.
Embodiment eight
In embodiments of the present invention, adjustment unit 63 specifically can comprise:
Adjust intensity that Executive Module 632 adjusts Dolby circuits and be described intensity of searching the Dolby circuit that module 631 searches.
Summary, whether the embodiment of the invention changes by the signal to noise ratio of the TV signal that judgement is obtained, when the signal to noise ratio of TV signal changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes, realized automatic detection signal-to-noise ratio, the intensity of automatic switchover Dolby circuit gives the user with favorable user experience, has improved the market competitiveness.
In addition, whether change, can improve the accuracy of judgement, thereby avoid influencing user's viewing effect because of erroneous judgement causes follow-up adjustment mistake by the signal to noise ratio of repeatedly judging received signal.
It should be noted that among the said system embodiment that each included unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize function corresponding; In addition, the concrete title of each functional unit also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step that realizes in the various embodiments described above method is to instruct relevant hardware to finish by program, corresponding program can be stored in the computer read/write memory medium, described storage medium is as ROM/RAM, disk or CD etc.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the method for a TV noise reduction is characterized in that, described method comprises the steps:
Obtain the signal to noise ratio of TV signal;
Judge whether the described signal to noise ratio of obtaining changes;
When described signal to noise ratio changes, dynamically adjust the intensity of Dolby circuit according to the signal to noise ratio that changes.
2. the method for claim 1 is characterized in that, the described step of obtaining the signal to noise ratio of TV signal is specially:
Calculate the local variance of each picture element in the TV signal that receives;
With the maximum of described local variance as signal variance, with the minimum value of described local variance as noise variance;
Calculate the signal to noise ratio of received signal, wherein:
Signal to noise ratio=the signal variance of received signal/noise variance.
3. the method for claim 1 is characterized in that, the described step of judging whether the described signal to noise ratio of obtaining changes is specially:
Whether the value of judging the current signal to noise ratio of obtaining equates with the value of the preceding signal to noise ratio of once obtaining;
When the value of the value of judging the current signal to noise ratio of obtaining and the preceding signal to noise ratio of once obtaining is unequal, judge whether the value of the described current signal to noise ratio of obtaining equates with the value of the signal to noise ratio of obtaining for N time afterwards, if equate, judge that then signal to noise ratio changes, wherein N 〉=2.
4. the method for claim 1 is characterized in that, described when judging that described signal to noise ratio changes, the step of dynamically adjusting the intensity of Dolby circuit according to the signal to noise ratio that changes is specially:
According to the default signal to noise ratio and the intensity corresponding relation of Dolby circuit, search the intensity of Dolby circuit of the signal to noise ratio correspondence of described variation;
The intensity of adjusting Dolby circuit is the intensity of the described Dolby circuit of searching.
5. the system of a TV noise reduction is characterized in that, described system comprises:
The signal to noise ratio acquiring unit is used to obtain the signal to noise ratio of TV signal;
Judging unit is used to judge whether the signal to noise ratio that described signal to noise ratio acquiring unit obtains changes;
Adjustment unit is used for when the described signal to noise ratio of described judgment unit judges changes, and dynamically adjusts the intensity of Dolby circuit according to the signal to noise ratio that changes.
6. the system as claimed in claim 1 is characterized in that, described signal to noise ratio acquiring unit specifically comprises:
The variance computing module is used for calculating the local variance of each picture element of the TV signal of reception;
Variance determination module, the maximum that is used for local variance that computing module is calculated be as signal variance, with the minimum value of local variance as noise variance;
The snr computation module is used to calculate the signal to noise ratio of received signal, wherein: the signal to noise ratio=signal variance of received signal/noise variance.
7. the system as claimed in claim 1 is characterized in that, described judging unit specifically comprises:
First judge module is used to judge whether the value of the current signal to noise ratio of obtaining equates with the value of the preceding signal to noise ratio of once obtaining;
Second judge module, be used for when first judge module judges that the value of the value of the current signal to noise ratio of obtaining and the preceding signal to noise ratio of once obtaining is unequal, judge whether the value of the described current signal to noise ratio of obtaining equates with the value of the signal to noise ratio of obtaining for N time afterwards, if equate, judge that then signal to noise ratio changes, wherein N 〉=2.
8. the system as claimed in claim 1 is characterized in that, describedly specifically comprises when described adjustment unit:
Search module, be used for, search the intensity of Dolby circuit of the signal to noise ratio correspondence of described variation according to the default signal to noise ratio and the intensity corresponding relation of Dolby circuit;
Adjust Executive Module, the intensity that is used to adjust Dolby circuit is described intensity of searching the Dolby circuit of module searches.
9. a television set is characterized in that, described television set comprises the system of the described TV noise reduction of the arbitrary claim of claim 5 to 8.
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| CN 201110057260 CN102186002A (en) | 2011-03-10 | 2011-03-10 | Method and system for television noise reduction and television |
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| CN 201110057260 CN102186002A (en) | 2011-03-10 | 2011-03-10 | Method and system for television noise reduction and television |
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| CN103916732A (en) * | 2012-12-31 | 2014-07-09 | 广州励丰文化科技股份有限公司 | Control method for active integrated loudspeaker box provided with multi-digital signal processor system |
| CN106961509A (en) * | 2017-04-25 | 2017-07-18 | 广东欧珀移动通信有限公司 | Session parameter processing method, device and electronic equipment |
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Cited By (3)
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| CN103916732A (en) * | 2012-12-31 | 2014-07-09 | 广州励丰文化科技股份有限公司 | Control method for active integrated loudspeaker box provided with multi-digital signal processor system |
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Application publication date: 20110914 |