CN101908897A - Broadcasting receiver and adjusting method thereof - Google Patents
Broadcasting receiver and adjusting method thereof Download PDFInfo
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- CN101908897A CN101908897A CN2009101470130A CN200910147013A CN101908897A CN 101908897 A CN101908897 A CN 101908897A CN 2009101470130 A CN2009101470130 A CN 2009101470130A CN 200910147013 A CN200910147013 A CN 200910147013A CN 101908897 A CN101908897 A CN 101908897A
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Abstract
The invention relates to a broadcasting receiver which comprises a tuned circuit and a demodulation circuit, wherein the demodulation circuit is used for tuning a radio frequency signal and outputting an intermediate frequency signal; and the demodulation circuit is used for demodulating the intermediate frequency signal transmitted from the demodulation circuit and outputting a command signal according to the quality of the intermediate frequency signal so as to change the value of a take-over point in the demodulation circuit. The invention also discloses a method for adjusting the broadcasting receiver.
Description
Technical field
The invention relates to a kind of radio receiver, and specifically, relate to a kind of radio receiver that dynamically is applicable to the varying input signal quality.
Background technology
For generally having the radio receiver of tuner, usually in tuner, can be preset with a take-over point (take-over point, TOP) value, it is set in radio frequency automatic gain control (RF automatic gaincontrol, RF AGC) state replaces intermediate frequency automatic gain control (IF automatic gain control, IFAGC) state part, and TOP value is relevant with the change in gain or the performance of tuner.For example, if the TOP value is too big, then the output signal of tuner can diminish influenced because of the intermediate frequency amplitude gain; On the contrary, if the TOP value is too little, then the output signal of tuner can become big and saturated because of the intermediate frequency amplitude gain.
On the other hand, the TOP value is predeterminable replaces radio frequency automatic gain state of a control part in intermediate frequency automatic gain state of a control; At this moment, the output signal of tuner also may and then influence follow-up signal processing because of the TOP value becomes big or diminishes influencedly.For this reason, how according to the input signal of tuner and suitably set the TOP value and just seem extremely important.
Summary of the invention
An object of the present invention is is providing a kind of radio receiver, uses and improves the wherein quality of transmission signals.
An object of the present invention is to use the performance of improving radio receiver in that a kind of method of adjusting radio receiver is provided.
A technology sample attitude of the present invention is about a kind of radio receiver, and it comprises tuning circuit and demodulator circuit.Tuning circuit is exported intermediate-freuqncy signal in order to the tuned radio frequency signal.The intermediate-freuqncy signal that demodulator circuit transmits in order to the demodulation tuning circuit, and according to the quality output instruction signal of intermediate-freuqncy signal, to change the value of take-over point in the tuning circuit.
Another technology sample attitude of the present invention is about a kind of radio receiver, and it comprises tuning circuit, demodulator circuit and host circuit.Tuning circuit is exported intermediate-freuqncy signal in order to the tuned radio frequency signal.The intermediate-freuqncy signal that demodulator circuit transmits in order to the demodulation tuning circuit, and according to the quality of intermediate-freuqncy signal output alert signal.Host circuit is in order to according to the alert signal output instruction signal, to change the value of take-over point in the tuning circuit.
Another technology sample attitude of the present invention is about a kind of method of adjusting radio receiver, and wherein radio receiver comprises tuning circuit and demodulator circuit, and tuning circuit produces intermediate-freuqncy signal in order to the tuned radio frequency signal, and demodulator circuit is in order to the demodulation intermediate-freuqncy signal.The method comprises: check the quality of intermediate-freuqncy signal, and produce command signal according to the quality of intermediate-freuqncy signal; Change the value of the take-over point in the tuning circuit according to command signal.
According to technology contents of the present invention, the method for application of aforementioned radio receiver and adjustment radio receiver not only can promote the wherein quality of transmission signals, also can improve the performance of radio receiver and the ability of dynamic process signal thereof.
Description of drawings
Fig. 1 is the block schematic diagram that illustrates a kind of radio receiver according to the embodiment of the invention.
Fig. 2 is the block schematic diagram that illustrates radio receiver according to another embodiment of the present invention.
Fig. 3 illustrates when the level of radiofrequency signal does not change according to the embodiment of the invention, between rf gain and intermediate-frequency gain and the schematic diagram that concerns between rf gain and intermediate-freuqncy signal quality.
Fig. 4 is the flow chart that illustrates a kind of TOP of obtaining value according to the embodiment of the invention.
Fig. 5 illustrates the schematic diagram that concerns between a kind of weight and the signal quality according to the embodiment of the invention.
Fig. 6 illustrates a kind of flow chart of adjusting radio receiver according to the embodiment of the invention.
The main element symbol description:
100,200: radio receiver
110,210: tuning circuit
120,220: demodulator circuit
122,222: supervisory circuit
230: host circuit
402～416,602～606: step
Embodiment
Fig. 1 is the block schematic diagram that illustrates a kind of radio receiver according to the embodiment of the invention.Radio receiver 100 comprises tuning circuit 110 and demodulator circuit 120, and wherein tuning circuit 110 also comprises radio frequency amplifier (not illustrating) in practical application, and radio frequency amplifier couples intermediate frequency amplifier (not illustrating) subsequently.In tuning circuit 110, (it is set in automatic gain control, and (automatic gain control, AGC) state stops and another automatic gain state of a control replacement adapter part for take-over point, value TOP) to be preset with take-over point.For example, the TOP value is set in radio frequency automatic gain control (RF AGC) state replacement intermediate frequency automatic gain control (IF AGC) state part.Tuning circuit 110 is in order to the tuned radio frequency signal, and exports intermediate-freuqncy signal accordingly according to the TOP value.The intermediate-freuqncy signal that demodulator circuit 120 is transmitted in order to demodulation tuning circuit 110, and according to the quality output instruction signal of intermediate-freuqncy signal, to change above-mentioned default TOP value.
Particularly, if tuning circuit 110 is according to default TOP value output intermediate-freuqncy signal, and the quality of this intermediate-freuqncy signal, for example: bit error rate (bit error rate, BER), packet error probability (packet errorrate, PER), modulation error rate (modulation error rate, MER) or signal to noise ratio (signal-to-noiseratio, SNR), be not as the good of expection or can't reach certain particular requirement, just demodulator circuit 120 can output instruction signal and change default TOP value.In addition, demodulator circuit 120 can also comprise supervisory circuit 122, in order to the monitoring intermediate-freuqncy signal quality, and accordingly the move instruction signal to tuning circuit 110.
In one embodiment, be preset with two TOP values in the tuning circuit 110, and when command signal that tuning circuit 110 receiving demodulation circuits 120 are transmitted, wherein the TOP value can change and switches to another TOP value; Also promptly, the TOP value alternately changes between two predetermined TOP values.In another embodiment, be preset with a plurality of TOP values in the tuning circuit 110, and when command signal that tuning circuit 110 receiving demodulation circuits 120 are transmitted, wherein default TOP value (round-robin fashion) in a looping fashion changes switching, wherein " circulation " be meant a kind of configuration mode of all unit in the group being selected with quite and rational order, normally in a tabulation, from top to bottom select, after having selected, restart circulation by above tabulating again then.In another embodiment, demodulator circuit 120 is set default TOP value in the tuning circuit 110 according to the radio frequency amplifier under the different gains value, and this default TOP value is set when tuning circuit 110 receives the command signal that demodulator circuit 120 transmitted.
Fig. 2 is the block schematic diagram that illustrates radio receiver according to another embodiment of the present invention.Radio receiver 200 comprises tuning circuit 210, demodulator circuit 220 and host circuit (host) 230, and wherein tuning circuit 210 also comprises radio frequency amplifier (not illustrating) in practical application, and radio frequency amplifier couples intermediate frequency amplifier (not illustrating) subsequently.Tuning circuit 210 is in order to the tuned radio frequency signal, and exports intermediate-freuqncy signal accordingly according to the TOP value.The intermediate-freuqncy signal that demodulator circuit 220 is transmitted in order to demodulation tuning circuit 210, and export an alert signal according to the quality of intermediate-freuqncy signal.In addition, demodulator circuit 220 can also comprise supervisory circuit 222, in order to the quality of monitoring intermediate-freuqncy signal, and produces alert signal accordingly.The alert signal that host circuit 230 is transmitted in order to receiving demodulation circuit 220, and according to the alert signal output instruction signal, to change above-mentioned default TOP value, wherein host circuit 230 can be elements such as chip, processor.
Similarly, if tuning circuit 210 is according to default TOP value output intermediate-freuqncy signal, and the quality of this intermediate-freuqncy signal, for example: bit error rate (bit error rate, BER), packet error probability (packet errorrate, PER), modulation error rate (modulation error rate, MER) or signal to noise ratio (signal-to-noiseratio, SNR), be not as the good of expection or can't reach a certain particular requirement, demodulator circuit 220 just can be exported alert signal and remove to notify host circuit 230, make host circuit 230 notified and the move instruction signal to tuning circuit 210.In addition, default TOP value also can alternately change between two predetermined TOP values, change switching in a looping fashion between a plurality of TOP values, or be set at another TOP value according to the radio frequency amplifier under the different gains value as mentioned above.
Above-mentioned TOP value can be set by different way.What follows be wherein a kind of in order to set the execution mode of TOP value in the tuning circuit.Fig. 3 illustrates when the level of radiofrequency signal does not change according to the embodiment of the invention, between rf gain and intermediate-frequency gain and the schematic diagram that concerns between rf gain and intermediate-freuqncy signal quality.With Fig. 3, more specifically, when rf gain increased, intermediate-frequency gain can be successively decreased thereupon.In a-quadrant and B zone as shown in Figure 3, rf gain is too little, to such an extent as to the quality of intermediate-freuqncy signal is affected and can't reaches certain requirement.In C zone as shown in Figure 3, the quality of intermediate-freuqncy signal maintains good state.In the D shown in the 3rd figure zone and E zone, intermediate-freuqncy signal is big and saturated because of the rf gain change, and the quality of intermediate-freuqncy signal variation once again.As from the foregoing, the TOP value can be set in as shown in Figure 3 the C zone.
Yet owing to the quality of intermediate-freuqncy signal may change in the C zone to some extent, and the best in quality of intermediate-freuqncy signal may be dropped near among the B or D zone in C zone the therefore following execution mode that just provides another kind of in order to TOP value in the setting tuning circuit.
In another embodiment, the TOP value can utilize the yield value after the weighting of accumulation intermediate frequency amplifier to set, wherein the yield value of intermediate frequency amplifier corresponds to the yield value of radio frequency amplifier respectively, and the yield value of intermediate frequency amplifier is weighted according to the quality of intermediate-freuqncy signal.Particularly, a plurality of gain value settings of radio frequency amplifier in a preset range, with the yield value of the corresponding intermediate frequency amplifier of yield value of radio frequency amplifier then be to obtain by this.In addition, when the quality of intermediate frequency signal surpassed predetermined critical, the yield value of intermediate frequency amplifier was accumulated along with weight (weights), and the TOP value in the tuner is set according to accumulation results.Followingly will do explanation as an example with an embodiment.
Fig. 4 is the flow chart that illustrates a kind of TOP of obtaining value according to the embodiment of the invention.At first, close radio frequency automatic gain control (RF AGC), start intermediate frequency automatic gain control (IF AGC), and rf gain is set at minimum value (step 402).Then, this program is waited for one period scheduled time (step 404), makes corresponding intermediate-frequency gain stably to be acquired according to rf gain.Afterwards, judge whether intermediate-frequency gain stablizes (step 406).If the unsettled words of intermediate-frequency gain, then this flow process is returned step 404.On the contrary, if intermediate-frequency gain is stable, judge then whether the quality of intermediate-freuqncy signal surpasses predetermined critical THD (step 408).Moreover, if the quality of intermediate-freuqncy signal surpasses predetermined critical THD, then specify and correspond to the weight of intermediate-freuqncy signal quality (as: being directly proportional), and write down corresponding intermediate-frequency gain and weight (step 410) thereof with the intermediate-freuqncy signal quality.In one embodiment, above-mentioned weight can be set the function as the intermediate-freuqncy signal quality.Fig. 5 illustrates the schematic diagram that concerns between a kind of weight and the signal quality according to the embodiment of the invention.As shown in Figure 5, when the quality of intermediate frequency signal surpassed predetermined critical THD, if the quality of intermediate-freuqncy signal better, then weight was bigger.After step 410, increase rf gain (step 412).On the other hand, if the quality of intermediate-freuqncy signal is no more than predetermined critical THD, then directly increase rf gain (step 412).
Then, judge whether the rf gain that is increased surpasses the maximum (step 414) of rf gain.If the rf gain that is increased is no more than the maximum radio frequency gain, then this flow process is returned step 404, to obtain another corresponding intermediate-frequency gain according to rf gain.On the contrary, if the rf gain that is increased surpasses the maximum radio frequency gain, then can utilize above-mentioned intermediate-frequency gain value that writes down of accumulation and additional weight thereof to obtain TOP value (step 416).For instance, the TOP value can be obtained by following equation calculating:
Wherein, the index of γ relative intermediate-frequency gain that writes down of representative and weight thereof.
Fig. 6 illustrates a kind of flow chart of adjusting radio receiver according to the embodiment of the invention.At first, check the quality (step 602) of intermediate-freuqncy signal, for example: bit error rate (bit error rate, BER), packet error probability (packet error rate, PER), modulation error rate (modulation error rate, MER) or signal to noise ratio (signal-to-noise ratio, the combination of parameter or above-mentioned parameter such as SNR).Then, according to the result who checks the default TOP value in the tuning circuit of radio receiver is changed (step 604).For instance, the TOP value can alternately change between two predetermined TOP values in tuning circuit, or changes switching in a looping fashion between a plurality of TOP values.In step 604, can produce command signal according to the result who checks by demodulator circuit 120 earlier as shown in Figure 1, again command signal is passed back tuning circuit 110, to change the TOP value; Perhaps as shown in Figure 2, produce alert signal according to the result who checks by demodulator circuit 220 earlier, produce command signal according to alert signal by demodulator circuit 220 host circuit 230 subsequently again, make the TOP value to change switching according to command signal.
In another embodiment, in the quality (step 602) of checking intermediate-freuqncy signal afterwards, obtain suitable TOP value (step 606) according to the radio frequency amplifier under the different radio frequency yield value earlier.For example, at first, in preset range, set a plurality of yield values of radio frequency amplifier; Then, obtain yield value with the corresponding intermediate frequency amplifier of yield value of radio frequency amplifier; Then, when the quality of intermediate frequency signal surpasses predetermined critical, along with the yield value of weight accumulation intermediate frequency amplifier, to obtain suitable TOP value.Afterwards, again with the default TOP value in the tuning circuit of radio receiver, change switches to above-mentioned suitable TOP value (step 604).
By the embodiment of the invention described above as can be known, application of aforementioned radio receiver and adjust the method for radio receiver not only can promote the wherein quality of transmission signals, also can improve the performance of radio receiver and the ability of dynamic process signal thereof.
Though the present invention discloses as above with execution mode; yet it is not in order to limiting the present invention, anyly has the knack of this skill person, 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 the accompanying Claim person of defining.
Claims (20)
1. radio receiver comprises:
Tuning circuit is exported intermediate-freuqncy signal in order to the tuned radio frequency signal; And
Demodulator circuit, this intermediate-freuqncy signal that transmits in order to this tuning circuit of demodulation, and according to the quality output instruction signal of this intermediate-freuqncy signal, to change the value of the take-over point in this tuning circuit.
2. radio receiver as claimed in claim 1, wherein the value of this take-over point alternately changes between the value of two predetermined take-over point in this tuning circuit.
3. radio receiver as claimed in claim 1, wherein the value of this take-over point changes between the value of a plurality of take-over point in a looping fashion in this tuning circuit.
4. radio receiver as claimed in claim 1, wherein this demodulator circuit is exported this command signal according to bit error rate, packet error probability, modulation error rate or the signal to noise ratio of this intermediate-freuqncy signal.
5. radio receiver as claimed in claim 1, wherein this tuning circuit comprises radio frequency amplifier, and this radio frequency amplifier couples an intermediate frequency amplifier subsequently, and this demodulator circuit is set the value of this take-over point according to this radio frequency amplifier under the different gains value.
6. radio receiver as claimed in claim 5, wherein the value of this take-over point is accumulated the yield value of this intermediate frequency amplifier along with weight and is set, the yield value of this intermediate frequency amplifier corresponds to the yield value of this radio frequency amplifier respectively, and the correlation of attributes of those weights and this intermediate-freuqncy signal.
7. radio receiver comprises:
Tuning circuit is exported intermediate-freuqncy signal in order to the tuned radio frequency signal;
Demodulator circuit, this intermediate-freuqncy signal that transmits in order to this tuning circuit of demodulation, and according to the quality output alert signal of this intermediate-freuqncy signal; And
Host circuit is in order to according to this alert signal output instruction signal, to change the value of the take-over point in this tuning circuit.
8. radio receiver as claimed in claim 7, wherein the value of this take-over point alternately changes between the value of two predetermined take-over point in this tuning circuit.
9. radio receiver as claimed in claim 7, wherein the value of this take-over point changes between the value of a plurality of take-over point in a looping fashion in this tuning circuit.
10. radio receiver as claimed in claim 7, wherein this demodulator circuit is exported this alert signal according to bit error rate, packet error probability, modulation error rate or the signal to noise ratio of this intermediate-freuqncy signal.
11. radio receiver as claimed in claim 7, wherein this tuning circuit comprises radio frequency amplifier, and this radio frequency amplifier couples intermediate frequency amplifier subsequently, and this demodulator circuit is set the value of this take-over point according to this radio frequency amplifier under the different gains value.
12. radio receiver as claimed in claim 11, wherein the value of this take-over point is accumulated the yield value of this intermediate frequency amplifier along with weight and is set, the yield value of this intermediate frequency amplifier corresponds to the yield value of this radio frequency amplifier respectively, and the correlation of attributes of those weights and this intermediate-freuqncy signal.
13. a method of adjusting radio receiver, wherein this radio receiver comprises tuning circuit and demodulator circuit, and this tuning circuit produces intermediate-freuqncy signal in order to the tuned radio frequency signal, and this demodulator circuit is in order to this intermediate-freuqncy signal of demodulation, and this method comprises:
Check the quality of this intermediate-freuqncy signal, and produce command signal according to the quality of this intermediate-freuqncy signal;
Change the value of the take-over point in this tuning circuit according to this command signal.
14. method as claimed in claim 13, wherein the value of this take-over point alternately changes between the value of two predetermined take-over point in this tuning circuit.
15. method as claimed in claim 13, wherein the value of this take-over point changes between the value of a plurality of take-over point in a looping fashion in this tuning circuit.
16. method as claimed in claim 13, wherein this tuning circuit comprises radio frequency amplifier, and this radio frequency amplifier couples intermediate frequency amplifier subsequently, and the value of this take-over point is set according to this radio frequency amplifier under the different gains value.
17. method as claimed in claim 16, the step of wherein setting the value of this take-over point also comprises:
In preset range, set a plurality of yield values of this radio frequency amplifier;
Obtain a plurality of yield values with corresponding this intermediate frequency amplifier of those yield values of this radio frequency amplifier;
When the quality of this intermediate-freuqncy signal surpasses predetermined critical, accumulate those yield values of this intermediate frequency amplifier along with weight; And
Set the value of this take-over point according to accumulation results.
18. method as claimed in claim 13 checks that wherein the step of this intermediate-freuqncy signal quality also comprises:
Check bit error rate, packet error probability, modulation error rate or the signal to noise ratio of this intermediate-freuqncy signal.
19. method as claimed in claim 13, wherein this command signal is produced by the quality of this demodulator circuit according to this intermediate-freuqncy signal.
20. method as claimed in claim 13, wherein this command signal is produced by the quality of this demodulator circuit main frame subsequently according to this intermediate-freuqncy signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101470130A CN101908897A (en) | 2009-06-04 | 2009-06-04 | Broadcasting receiver and adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101470130A CN101908897A (en) | 2009-06-04 | 2009-06-04 | Broadcasting receiver and adjusting method thereof |
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| CN101908897A true CN101908897A (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101470130A Pending CN101908897A (en) | 2009-06-04 | 2009-06-04 | Broadcasting receiver and adjusting method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778039A (en) * | 2003-04-17 | 2006-05-24 | 皇家飞利浦电子股份有限公司 | Front-end sensitivity booster |
| CN101090285A (en) * | 2006-06-14 | 2007-12-19 | 联发科技股份有限公司 | Radio frequency signal receiver with adequate automatic gain control |
| CN101123419A (en) * | 2007-08-08 | 2008-02-13 | 中国科学院电子学研究所 | Automatic control method for RF amplifier gain based on varying electrical bridge principle |
| CN101132209A (en) * | 2007-10-15 | 2008-02-27 | 威盛电子股份有限公司 | Apparatus and method for automatic gain control |
| CN101394496A (en) * | 2007-09-17 | 2009-03-25 | 奇景光电股份有限公司 | Front-end for digital video receiver and method for automatic gain control thefeof |
-
2009
- 2009-06-04 CN CN2009101470130A patent/CN101908897A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778039A (en) * | 2003-04-17 | 2006-05-24 | 皇家飞利浦电子股份有限公司 | Front-end sensitivity booster |
| CN101090285A (en) * | 2006-06-14 | 2007-12-19 | 联发科技股份有限公司 | Radio frequency signal receiver with adequate automatic gain control |
| CN101123419A (en) * | 2007-08-08 | 2008-02-13 | 中国科学院电子学研究所 | Automatic control method for RF amplifier gain based on varying electrical bridge principle |
| CN101394496A (en) * | 2007-09-17 | 2009-03-25 | 奇景光电股份有限公司 | Front-end for digital video receiver and method for automatic gain control thefeof |
| CN101132209A (en) * | 2007-10-15 | 2008-02-27 | 威盛电子股份有限公司 | Apparatus and method for automatic gain control |
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Application publication date: 20101208 |