CN1956522A - Method for setting gain parameter - Google Patents
Method for setting gain parameter Download PDFInfo
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- CN1956522A CN1956522A CN 200510104400 CN200510104400A CN1956522A CN 1956522 A CN1956522 A CN 1956522A CN 200510104400 CN200510104400 CN 200510104400 CN 200510104400 A CN200510104400 A CN 200510104400A CN 1956522 A CN1956522 A CN 1956522A
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Abstract
This invention relates to a method for setting gain parameters and provides a method for realizing setting gain control parameter automatically according to a tested standard signal, which realizes a control flow in the main chip of a TV, namely, comparing the normal S/N ratio interval with that of channel signal after regulating the AGC parameter to judge if the initial change of grade of S/N ratio appears and set the initial value of the AGC parameter automatically based on the S/N ratio of the regulated standard TV signals.
Description
Technical field
The present invention relates to a kind of signal to noise ratio, realize the method for automatic setting gain control parameter (AGC parameter) according to standard signal.
Background technology
Television set has become the essential product in the daily life at present, and TV reception is that the user carries out amusement and recreation and understands the dynamic indispensable approach of news.
As existing all types of CRT television sets, because there is bigger difference in the TV signal that television set hardware device and viewer location can receive.For improving the rating quality, watch program picture clearly to satisfy the user, need configure the automatic gaining controling parameter (AGC parameter) of television set usually in advance, to solve the rating problem of bringing because of unlike signal intensity.
Producing in the technological process of television set at present, be by the signal to noise ratio of operator according to detected standard signal, one by one, manually regulate the AGC parameter, and determine the scope of adjusting AGC parameter according to self working experience.Not only need to detect repeatedly and compare, and the progress of adjusting AGC parameter is slow, production efficiency is lower.Still there is certain error in AGC parameter after the adjusting, and the difficulty thereby the picture quality that easily causes the user to receive does not pass a test has influence on the rating quality.
Summary of the invention
The establishing method of gain parameter of the present invention, its purpose are to address the above problem and provide a kind of with defective and can realize the method for automatic setting gain control parameter according to detected standard signal.This method is to realize a kind of control flow in the television set master chip, and promptly the normal signal to noise ratio of standard signal is interval compares with the signal to noise ratio of regulating the channel signal that obtains after the AGC parameter, to judge whether to occur the initial change of signal to noise ratio grade.
For achieving the above object, the establishing method of described gain parameter is the signal to noise ratio according to the standard television signal after the demodulation, the initial value of automatic setting AGC parameter.
Its realization flow is:
Step 1 is carried out demodulation to the standard television signal of input, obtains the TV signal after the demodulation, the signal to noise ratio of the signal that settles the standard, and be set at Xa;
Step 2, the initial value of setting the AGC parameter is Z0, and with (0, the 3F) interval of AGC parameter value for a change, the interval of setting normal signal to noise ratio thus be (Ya, Yb);
Step 3, in AGC parameter setting process, (0,3F) value one by one in the interval changing the value of AGC parameter, and detects the signal to noise ratio Xb of the channel signal in the AGC parameter change procedure above-mentioned;
Step 4, judge that detected signal to noise ratio Xb compares with Ya, Yb respectively, be consistent with Ya, Yb respectively as if Xb, i.e. Xb-Ya=0 and Xb-Yb=0, then repeat the rapid AGC parameter value of previous step and the signal to noise ratio Xb of definite channel signal, and compare with Ya, Yb respectively once more;
If at least one value does not conform among Xb and Ya or the Yb, then stop the AGC parameter above-mentioned (0,3F) interval interior value, and note AGC parameter value Z at this moment;
Step 5 writes corresponding address with the AGC parameter value Z that obtains and preserves, and the setting of gain parameter finishes, and jumps out above-mentioned setting process.
Gain parameter establishing method as above-mentioned scheme content, the signal to noise ratio Xb of channel signal change initial, be Xb with Ya or Yb at least one value when not conforming to, promptly stop the AGC parameter above-mentioned (0,3F) interval interior value, the AGC parameter that obtains thus is comparatively accurate, thereby can overcome the human factor that operating personnel judge, view reception effect the best.
Use for improving the production efficiency of above-mentioned gain parameter establishing method, will (0,3F) interval is divided equally, promptly be divided into (0,1F) and (20,3F) interval.
The AGC parameter above-mentioned (0,1F) and (20,3F) during interval value, select the interval value of going ahead of the rest at random, and judge in view of the above whether signal to noise ratio Xb does not conform to Ya or Yb; After value in interval is taken out, signal to noise ratio Xb still with Ya, when Yb conforms to, the AGC parameter is carried out value again and is judged in another interval.
The signal to noise ratio Xb of above-mentioned detected channel signal is stored in the read-only register, is modified in judging comparison procedure preventing.
Content to sum up, the advantage of the establishing method of described gain parameter is:
1, described establishing method is cured in the television set master chip, realizes a kind of flow process of automatic control usually, alternative operator's manual adjustments has overcome human factor, has also effectively enhanced productivity.
2, the signal to noise ratio Xb of channel signal change initial, the value that promptly stops the AGC parameter changes, thereby the AGC parameter setting is accurate, can directly restore the image of best in quality according to the signal of different user television set.
3, do not increasing under the condition of cost, improving the control flow of television set master chip, easily promoting the use of.
Description of drawings
Fig. 1 is the flow chart of described gain parameter establishing method.
Embodiment
Embodiment 1, as shown in Figure 1, the establishing method of gain parameter of the present invention, its realization flow is:
Step 1 is carried out demodulation to the standard television signal of input, obtains the TV signal after the demodulation, the signal to noise ratio of the signal that settles the standard, and be set at Xa;
Step 2, the initial value of setting the AGC parameter is Z0, and with (0, the 3F) interval of AGC parameter value for a change, the interval of setting normal signal to noise ratio thus be (Ya, Yb);
Step 3, in AGC parameter setting process, (0,3F) interval is divided equally and is formed (0 with above-mentioned, 1F) and (20,3F) interval, the AGC parameter is earlier (0,1F) value one by one in the interval changing the value of AGC parameter, and detects the signal to noise ratio Xb of the channel signal in the AGC parameter change procedure;
Step 4, the signal to noise ratio Xb of above-mentioned detected channel signal is stored in the read-only register;
Judge that detected signal to noise ratio Xb compares with Ya, Yb respectively, if Xb is consistent with Ya, Yb respectively, be Xb-Ya=0 and Xb-Yb=0, then repeat the rapid AGC parameter value of previous step and the signal to noise ratio Xb of definite channel signal, and compare with Ya, Yb respectively once more;
If the AGC parameter (0, after 1F) all values finish in the interval, signal to noise ratio Xb still with Ya, when Yb conforms to, then the AGC parameter is again in that (20,3F) value one by one in the interval judges thereupon whether signal to noise ratio Xb does not conform to Ya or Yb.
If at least one value does not conform among Xb and Ya or the Yb, then stop the value of AGC parameter, and note AGC parameter value Z at this moment;
Step 5 writes corresponding address with the AGC parameter value Z that obtains and preserves, and the setting of gain parameter finishes, and jumps out above-mentioned setting process.
Claims (3)
1, a kind of establishing method of gain parameter is characterized in that: the realization flow of described establishing method is,
Step 1 is carried out demodulation to the standard television signal of input, obtains the TV signal after the demodulation, the signal to noise ratio of the signal that settles the standard, and be set at Xa;
Step 2, the initial value of setting the AGC parameter is Z0, and with (0, the 3F) interval of AGC parameter value for a change, the interval of setting normal signal to noise ratio thus be (Ya, Yb);
Step 3, in AGC parameter setting process, (0,3F) value one by one in the interval changing the value of AGC parameter, and detects the signal to noise ratio Xb of the channel signal in the AGC parameter change procedure above-mentioned;
Step 4, judge that detected signal to noise ratio Xb compares with Ya, Yb respectively, be consistent with Ya, Yb respectively as if Xb, i.e. Xb-Ya=0 and Xb-Yb=0, then repeat the rapid AGC parameter value of previous step and the signal to noise ratio Xb of definite channel signal, and compare with Ya, Yb respectively once more;
If at least one value does not conform among Xb and Ya or the Yb, then stop the AGC parameter above-mentioned (0,3F) interval interior value, and note AGC parameter value Z at this moment;
Step 5 writes corresponding address with the AGC parameter value Z that obtains and preserves, and the setting of gain parameter finishes, and jumps out above-mentioned setting process.
2, the establishing method of gain parameter according to claim 1 is characterized in that: will (0,3F) interval is divided equally, promptly be divided into (0,1F) and (20,3F) interval;
The AGC parameter above-mentioned (0,1F) and (20,3F) during interval value, select the interval value of going ahead of the rest at random, and judge in view of the above whether signal to noise ratio Xb does not conform to Ya or Yb; After value in interval is all taken out, signal to noise ratio Xb still with Ya, when Yb conforms to, the AGC parameter is carried out value again and is judged in another interval.
3, the establishing method of gain parameter according to claim 1 and 2 is characterized in that: the signal to noise ratio Xb of described detected channel signal is stored in the read-only register.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510104400 CN1956522A (en) | 2005-10-28 | 2005-10-28 | Method for setting gain parameter |
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| CN 200510104400 CN1956522A (en) | 2005-10-28 | 2005-10-28 | Method for setting gain parameter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8212941B2 (en) | 2008-04-30 | 2012-07-03 | Mediatek Inc. | Digitized analog TV signal processing system |
| CN109788355A (en) * | 2018-12-18 | 2019-05-21 | 深圳市纽格力科技有限公司 | Set-top box and method based on live signal adjustment parameter |
-
2005
- 2005-10-28 CN CN 200510104400 patent/CN1956522A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8212941B2 (en) | 2008-04-30 | 2012-07-03 | Mediatek Inc. | Digitized analog TV signal processing system |
| CN109788355A (en) * | 2018-12-18 | 2019-05-21 | 深圳市纽格力科技有限公司 | Set-top box and method based on live signal adjustment parameter |
| CN109788355B (en) * | 2018-12-18 | 2021-03-30 | 深圳市纽格力科技有限公司 | Set top box and method for adjusting parameters based on real-time signals |
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