CN102883210B - Obtaining method of digital television progress bar and set top box - Google Patents
Obtaining method of digital television progress bar and set top box Download PDFInfo
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- CN102883210B CN102883210B CN201210370561.1A CN201210370561A CN102883210B CN 102883210 B CN102883210 B CN 102883210B CN 201210370561 A CN201210370561 A CN 201210370561A CN 102883210 B CN102883210 B CN 102883210B
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Abstract
The invention belongs to the field of digital television and provides an obtaining method of digital television progress bar and a set top box. The method comprises: obtaining an automatic gain control circuit AGC register valve and a signal quality register valve; and obtaining the display value of the digital television progress bar according to the AGC register valve and the signal quality register valve. The technical scheme provided by the invention has the advantages of accurately displaying the progress bar.
Description
Technical field
The invention belongs to digital TV field, particularly relate to a kind of acquisition methods and Set Top Box of Digital Television progress bar.
Background technology
For the equipment such as Set Top Box, digital TV integrated machine, when searching for digital television program, need the intensity and the quality that show current demand signal, so that user understands the situation of live signal, gui interface is generally embodied by the dynamic change of the progress bar of signal strength signal intensity and signal quality, and the show value of progress bar has a lot of method to obtain, such as, prior art utilizes master chip in monitoring a period of time to receive the BER(error rate occurred in packet), reflect current signal quality, and then adjustment signal strength signal intensity; Thus the show value of progress bar is obtained according to this signal quality and signal strength signal intensity.
In the technical scheme realizing prior art, find that prior art exists following technical problem:
In actual applications, not there is linear relationship in signal quality and signal strength signal intensity, namely when signal quality is fine, likely signal strength signal intensity is very poor, so the show value of the progress bar adopting the technical scheme of prior art to obtain is inaccurate, the quality of reaction Digital Television current demand signal that cannot be correct and intensity.
Summary of the invention
The object of the embodiment of the present invention is the acquisition methods providing a kind of Digital Television progress bar, is intended to the inaccurate problem of show value solving the progress bar that technical scheme of the prior art obtains.
The embodiment of the present invention is achieved in that a kind of acquisition methods of Digital Television progress bar, and described method comprises:
Obtain automatic gain control circuit AGC register value and signal quality register value;
The show value of Digital Television progress bar is obtained according to this AGC register value and signal quality register value.
On the other hand, provide a kind of Set Top Box, described Set Top Box comprises:
Acquiring unit, for obtaining automatic gain control circuit AGC register value and signal quality register value, and passes to computing unit by described AGC register value and signal quality register value;
Computing unit, for obtaining the show value of Digital Television progress bar according to this AGC register value and signal quality register value.
The embodiment of the present invention compared with prior art, beneficial effect is: technical scheme provided by the invention obtains the show value of progress bar by the value of AGC register and the value of signal quality register, due to relevant between the value of AGC register and the value of signal strength signal intensity, so adopt the value of AGC register can direct reaction signal intensity, so it has the show value advantage accurately of acquisition progress bar.
Accompanying drawing explanation
Fig. 1 is the flow chart of the acquisition methods of the Digital Television progress bar that the embodiment of the present invention provides;
Fig. 2 is signal quality register value, the graph of a relation between signal strength signal intensity register value and input signal that the embodiment of the present invention provides;
Fig. 3 is the detection block diagram of the Set Top Box that the embodiment of the present invention provides; And
Fig. 4 is the structure chart of the Set Top Box that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
First it should be noted that, the signal that the equipment such as Set Top Box receive, because transmitter, propagation distance, atmospheric environment and route of transmission there are differences, the signal strength signal intensity that set-top box front-end is received is different, general amplitude is all lower, at present, most of receiving equipment is all utilize demodulator(to modulate substantially) inner AGC(automatic gain control circuit) adjust voltage, make its stable output carry out the analog signal of demodulation to applicable demodulator.The trickle change AGC of external signal strength can adjust fast and make it stablize, and the automatic adjusting range of AGC accurately can be reflected to AGC register value (i.e. signal strength values), between this, we can obtain the change of AGC by monitoring AGC register value, thus know the change of signal strength signal intensity.
The embodiment of the present invention provides a kind of acquisition methods of Digital Television progress bar, and the method is performed by Set Top Box, and the method as shown in Figure 1, comprising:
S11, acquisition AGC register value and signal quality register value;
S12, obtain the show value of Digital Television progress bar according to this AGC register value and signal quality register value.
Technical scheme provided by the invention obtains the show value of progress bar by the value of AGC register and the value of signal quality register, due to relevant between the value of AGC register and the value of signal quality, so adopt the value of AGC register can direct reaction signal intensity, so it has the show value advantage accurately of acquisition progress bar.
Optionally, the method realizing S11 is specifically as follows: Set Top Box obtains AGC register value and signal quality register value by i2c order.
Optionally, the method realizing S12 is specifically as follows:
A1<=A<=A2，
SNRper=((A1-A)/(A2-A1))*((SNR-Qworst)/(Qbest-Qworst))；
A2<A<A5，
SNRper=((A2-A)/(A2-A5))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β;
A5<=A<=A6 and A5<=A<Aq,
SNRper=((A5-A)/(A5-Aq))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α;
A5<=A<=A6 and Aq<=A<=A6,
SNRper=((Aq-A)/(Aq-A6))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α;
A6<A<A3
SNRper=((A6-A)/(A6-A3))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β;
A3<A<A4
SNRper=((A3-A)/(A3-A4))*((SNR-Qworst)/(Qbest-Qworst));
Wherein, SNRper is progress bar show value, and A represents the actual AGC register value obtained in S11, and SNR represents the actual signal quality register value obtained in S11, and α, β are the constant of setting, and such as α is set as that 70%, β is set as 10%; Certainly can set other value in a practical situation, the specific embodiment of the invention does not limit to the occurrence of above-mentioned α, β yet; Qbest can be the optimum signal quality register value of set-top box recording; Qworst can be the most poor signal quality register value of set-top box recording, and Aq can be Set Top Box input signal strength when obtaining optimum signal.As shown in Figure 2, Fig. 2 is signal quality register value, graph of a relation between signal strength signal intensity register value (i.e. AGC register value) and input signal, and can know that from table 1 A1 can correspond to incoming level is 10(DBM), signal strength signal intensity register value is 55273, in like manner
A2 is incoming level is 5,
A3 is incoming level is-89
A4 is incoming level is-90
A5 is incoming level is-11
A6 is incoming level is-52
Time respectively corresponding register value (concrete value can see table 1), by the curve interval division that the determination signal quality register of these points is corresponding.
It should be noted that, the acquisition methods of above-mentioned parameter can adopt following method, certainly in a practical situation, other mode also can be adopted to obtain the parameter in above-mentioned formula.
First the present invention is by SFU(signaling frequency unit, signaling frequencies unit) instrument simulates two kinds of environment, and obtain AGC and the complete excursion of signal quality register, two kinds of environment are as follows:
The input of SFU: signal strength signal intensity and C/N (carrier-to-noise ratio, simulation actual channel environment).
Export: the input of top box tuner (tuner) that pick.
The first environment: noise-free environment (C/N=0)
In the absence of noise, first the signal strength signal intensity of suitable (factory settings) is inputted, Set Top Box performs lock station action, to pin after signal and broadcast program, then incoming signal level is changed, from maximum input level Amax to minimum incoming level Amin, and record AGC register value and the signal quality register value of corresponding points, simultaneously, observe program pictures, signal quality register value when confirming to occur that picture blocks (i.e. losing lock) and have mosaic, suspense is A0(Amax, losing lock), A1(Amax, mosaic), A2(Amin, losing lock), A3(Amin, mosaic), the monitoring block diagram of Set Top Box as shown in Figure 3, record form is as shown in table 1, can the interval of whole AGC change by the value in table 1, and the AGC changing value corresponding to each constant interval, can be as accurate as the excursion that 0.1DBM is corresponding.
Table 1:
According to change signal incoming level, we can obtain AGC register and the complete constant interval of signal quality register, if drawn according to the AGC register value gathered and signal quality register value described point, the variation tendency of signal strength signal intensity and signal quality can be found as shown in Figure 2, wherein signal strength signal intensity is linear change, and signal quality parabolically changes, when signal strength signal intensity very weak or very strong time, signal quality is all very poor, AGC register value when judging accordingly and obtain optimum signal quality point, be designated as Aq, as the reference value at the second ambient As input signal strength.
The second environment: input signal strength is best, changes C/N(carrier-to-noise ratio).Now, signal strength signal intensity input value is constant, means that AGC is constant, by adjusting the value of C/N, the value of observation signal quality register.The second environmental testing is based upon to carry out on the basis that the first environmental testing obtains Aq, after best incoming level is set, Set Top Box broadcast program, then input C/N is changed, from minimum C/N Qmin to maximum C/N Qmax, the value of record current signal quality register, and read in the interval obtaining signal quality variation, and there is the signal quality register value of mosaic and losing lock, in test process, interval is revised as far as possible little in the process that C/N changes from small to big, at this moment, signal quality variation is more responsive, test completes, determine the register value of Qworst and Qbest of signal quality, now Aq fixes, mean that AGC does not regulate (or having minor variations), signal quality module is only had to regulate.
Excursion between signal strength signal intensity and the signal quality whole district can be determined according to above two kinds of environmental testings, and the AGC changing value corresponding to each unit change length can be learnt, in actual environment, even if the change that signal strength signal intensity is trickle, also can monitor timely, and reflection on a progress bar.
According to Fig. 2, we can determine the variation relation of signal strength signal intensity and signal quality.Signal strength data linearly changes.And signal quality data parabolically changes, when signal strength signal intensity relatively good (within the scope of agc circuit the best adjustment), signal quality register value is all concentrating within the scope of one, change small, and when signal strength signal intensity changes to two ends by unit length, signal quality register value changes greatly.Therefore, segment processing signal quality register value, whole parabola scope is divided into 5 intervals by the input signal strength that two boundary points that the present invention relatively concentrates according to the key point of appearance mosaic corresponding to input signal strength, losing lock and signal quality register value are corresponding, because these 5 interval variation tendencies are inconsistent, for creating optimum experience, take segmented mode process.
Concrete implementation step is as follows:
1. signal strength signal intensity progress bar process
According to the signal strength signal intensity register data of test, signal strength signal intensity register value is along with input signal strength linear change, because signal strength signal intensity progress bar span is 0% ~ 100%, so directly signal strength signal intensity register value to be mapped to the calculating that signal strength signal intensity progress bar gets final product settling signal intensity progress bar.
2. signal quality progress bar process
Determine key point and interval (note: although key point is recorded as input signal strength, when calculating, employing be the signal strength signal intensity register value that input signal strength point is corresponding)---see Fig. 2 and table 1.
6 key points, be followed successively by occur losing lock, mosaic and signal quality register value relatively concentrate two boundary points (in these two boundary point intervals, the change of AGC or the change of channel circumstance, signal quality register value is caused to change less, curve is in milder variation tendency), be designated as A1, A4, A2, A3, A5, A6; 5 intervals are respectively [A1, A2], [A3, A4] between-losing lock to mosaic, [A2, A5], [A6, A3] between the boundary point relatively concentrated to signal quality register value of-mosaic, between the amount boundary point that [A5, A6]-signal quality register value is relatively concentrated, in addition, record optimum signal quality register value and most poor signal quality register value are Qbest and Qworst, and input signal strength Aq during acquisition optimum signal.
The embodiment of the present invention provides a kind of Set Top Box, and this Set Top Box as shown in Figure 4, comprising:
Acquiring unit 41, for obtaining automatic gain control circuit AGC register value and signal quality register value, and passes to computing unit 42 by described AGC register value and signal quality register value;
Computing unit 42, for obtaining the show value of Digital Television progress bar according to this AGC register value and signal quality register value.
Optionally, above-mentioned acquiring unit 41 is specifically for obtaining AGC register value and signal quality register value by i2c order.
Optionally, above-mentioned computing unit 42 specifically for:
Work as A1<=A<=A2,
SNRper=((A1-A)/(A2-A1))*((SNR-Qworst)/(Qbest-Qworst))；
Work as A2<A<A5,
SNRper=((A2-A)/(A2-A5))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β;
As A5<=A<=A6 and A5<=A<Aq,
SNRper=((A5-A)/(A5-Aq))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α;
As A5<=A<=A6 and Aq<=A<=A6,
SNRper=((Aq-A)/(Aq-A6))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α;
Work as A6<A<A3
SNRper=((A6-A)/(A6-A3))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β;
Work as A3<A<A4
SNRper=((A3-A)/(A3-A4))*((SNR-Qworst)/(Qbest-Qworst));
Wherein, SNRper is progress bar show value, and A represents AGC register value, and SNR represents signal quality register value, and α, β are the constant of setting; Qbest is the optimum signal quality register value of record; Qworst for recording most poor signal quality register value, input signal strength when Aq is for obtaining optimum signal.
It should be noted that in above-described embodiment, included unit is carry out dividing according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; 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 realized in the various embodiments described above method is that the hardware that can carry out instruction relevant by program has come, corresponding program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an acquisition methods for Digital Television progress bar, is characterized in that, described method comprises:
Obtain automatic gain control circuit AGC register value and signal quality register value;
The show value of Digital Television progress bar is obtained according to this AGC register value and signal quality register value;
Wherein, also comprise before described acquisition automatic gain control circuit AGC register value and signal quality register value:
Obtain AGC and the complete excursion of signal quality register, and the excursion of signal quality register is divided into 5 intervals by input signal strength A5 and A6 corresponding to two boundary points relatively concentrated according to the key point A2 of the key point A1 of appearance mosaic corresponding to input signal strength and A4, losing lock and A3 and information quality register value;
The described show value according to this AGC register value and signal quality register value acquisition Digital Television progress bar comprises:
Work as A1<=A<=A2,
SNRper＝((A1-A)/(A2-A1))*((SNR-Qworst)/(Qbest-Qworst))；
Work as A2<A<A5,
SNRper＝((A2-A)/(A2-A5))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β；
As A5<=A<=A6 and A5<=A<Aq,
SNRper＝((A5-A)/(A5-Aq))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α；
As A5<=A<=A6 and Aq<=A<=A6,
SNRper＝((Aq-A)/(Aq-A6))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α；
Work as A6<A<A3
SNRper＝((A6-A)/(A6-A3))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β；
Work as A3<A<A4
SNRper＝((A3-A)/(A3-A4))*((SNR-Qworst)/(Qbest-Qworst))；
Wherein, SNRper is progress bar show value, and A represents AGC register value, and SNR represents signal quality register value, and α, β are the constant of setting; Qbest is the optimum signal quality register value of record; Qworst for recording most poor signal quality register value, input signal strength when Aq is for obtaining optimum signal.
2. method according to claim 1, is characterized in that, described acquisition automatic gain control circuit AGC register value and signal quality register value specifically comprise:
AGC register value and signal quality register value is obtained by i2c order.
3. method according to claim 1, it is characterized in that, described A1 corresponds to signal strength signal intensity register value when incoming level is 10, A2 is incoming level signal strength signal intensity register value when being 5, A3 is incoming level signal strength signal intensity register value when being-89, A4 is incoming level signal strength signal intensity register value when being-90, A5 is incoming level signal strength signal intensity register value when being-11, A6 is incoming level signal strength signal intensity register value when being-52.
4. method according to claim 1, is characterized in that, described method also comprises:
Simulate two kinds of environment by signaling frequencies cell S FU instrument, obtain AGC and the complete excursion of signal quality register; Wherein said two kinds of environment are respectively: noise-free environment and input signal strength the best.
5. a Set Top Box, its spy is then, described Set Top Box comprises:
Acquiring unit, for obtaining automatic gain control circuit AGC register value and signal quality register value, and passes to computing unit by described AGC register value and signal quality register value;
Computing unit, for obtaining the show value of Digital Television progress bar according to this AGC register value and signal quality register value;
Wherein, acquisition automatic gain control circuit AGC register value and signal quality register value before, described acquiring unit also for:
Obtain AGC and the complete excursion of signal quality register, and the excursion of signal quality register is divided into 5 intervals by input signal strength A5 and A6 corresponding to two boundary points relatively concentrated according to the key point A2 of the key point A1 of appearance mosaic corresponding to input signal strength and A4, losing lock and A3 and information quality register value;
Described computing unit specifically for:
Work as A1<=A<=A2,
SNRper＝((A1-A)/(A2-A1))*((SNR-Qworst)/(Qbest-Qworst))；
Work as A2<A<A5,
SNRper＝((A2-A)/(A2-A5))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β；
As A5<=A<=A6 and A5<=A<Aq,
SNRper＝((A5-A)/(A5-Aq))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α；
As A5<=A<=A6 and Aq<=A<=A6,
SNRper＝((Aq-A)/(Aq-A6))*((SNR-Qworst)/(Qbest-Qworst))*(1-α)+α；
Work as A6<A<A3
SNRper＝((A6-A)/(A6-A3))*((SNR-Qworst)/(Qbest-Qworst))*(1-β)+β；
Work as A3<A<A4
SNRper＝((A3-A)/(A3-A4))*((SNR-Qworst)/(Qbest-Qworst))；
Wherein, SNRper is progress bar show value, and A represents AGC register value, and SNR represents signal quality register value, and α, β are the constant of setting; Qbest is the optimum signal quality register value of record; Qworst for recording most poor signal quality register value, input signal strength when Aq is for obtaining optimum signal.
6. Set Top Box according to claim 5, is characterized in that, described acquiring unit is specifically for obtaining AGC register value and signal quality register value by i2c order.
7. Set Top Box according to claim 5, it is characterized in that, described A1 corresponds to signal strength signal intensity register value when incoming level is 10, A2 is incoming level signal strength signal intensity register value when being 5, A3 is incoming level signal strength signal intensity register value when being-89, A4 is incoming level signal strength signal intensity register value when being-90, A5 is incoming level signal strength signal intensity register value when being-11, A6 is incoming level signal strength signal intensity register value when being-52.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595996A (en) * | 2004-07-08 | 2005-03-16 | 天津通广三星电子有限公司 | Method for realtime display of signal intensity of analogue television signal receiving system |
| CN101742165A (en) * | 2008-11-25 | 2010-06-16 | 康佳集团股份有限公司 | Method for indicating digital television signal and digital television using same |
| CN102196203A (en) * | 2010-03-03 | 2011-09-21 | 蒋新 | Vehicle-mounted satellite television receiving device and operating method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595996A (en) * | 2004-07-08 | 2005-03-16 | 天津通广三星电子有限公司 | Method for realtime display of signal intensity of analogue television signal receiving system |
| CN101742165A (en) * | 2008-11-25 | 2010-06-16 | 康佳集团股份有限公司 | Method for indicating digital television signal and digital television using same |
| CN102196203A (en) * | 2010-03-03 | 2011-09-21 | 蒋新 | Vehicle-mounted satellite television receiving device and operating method thereof |
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