CN111294573B - Satellite television signal receiving device and modulation method - Google Patents
Satellite television signal receiving device and modulation method Download PDFInfo
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- CN111294573B CN111294573B CN202010108541.1A CN202010108541A CN111294573B CN 111294573 B CN111294573 B CN 111294573B CN 202010108541 A CN202010108541 A CN 202010108541A CN 111294573 B CN111294573 B CN 111294573B
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- signal
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- receiving antenna
- tuner
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The application discloses a satellite television signal receiving device and a modulation method, wherein a second receiving antenna is added on the basis of original receiving equipment, the same satellite signals are respectively obtained by utilizing a first receiving antenna and a second receiving antenna which are arranged in the same area, then the second satellite signals after attenuation processing are used as noise sources for artificial introduction and are subjected to signal modulation with unprocessed first satellite signals, satellite frequency band signals corresponding to a preset signal-to-noise ratio are obtained, the compatibility requirements of the existing satellite signal-to-noise ratio modulation on equipment hardware and a communication protocol are reduced through the transformation of the receiving equipment, and the technical problem that the existing satellite television signal receiving device is poor in applicability is solved.
Description
Technical Field
The present application relates to the field of satellite television devices, and in particular, to a satellite television signal receiving apparatus and method.
Background
In recent years, satellite digital television technology is rapidly developed, currently, a stationary orbit satellite is generally adopted for satellite communication, the communication distance is long, the transmission delay is large, the coverage range is wide, the influence of ionosphere disturbance and rain, snow, fog and water vapor in air is easily caused in the communication process, and the channel condition in the beam coverage range is complex.
The prior art generally processes signals through a communication protocol carried by a receiving device so as to stabilize the signal-to-noise ratio of satellite signals, but the method has the technical problem of poor applicability.
Disclosure of Invention
The application provides a satellite television signal receiving device and a modulation method, which are used for solving the technical problem that the existing satellite television signal receiving device is poor in applicability.
In view of the above, a first aspect of the present application provides a satellite television signal receiving apparatus, comprising: the system comprises a first receiving antenna, a second receiving antenna, an attenuator, a combiner and a set top box;
the output end of the first receiving antenna is connected with the first input end of the combiner;
the output end of the second receiving antenna is connected with the second input end of the combiner, and the attenuator is connected between the output end of the second receiving antenna and the second input end of the combiner in series;
and the output end of the combiner is connected with the signal input end of the set top box.
Optionally, the attenuator is embodied as an adjustable attenuator.
Optionally, the local oscillation frequency parameter of the second tuner in the second receiving antenna is lower than the local oscillation offset parameter of the first tuner in the first receiving antenna.
Optionally, a frequency difference between the local oscillation offset parameter of the first tuner and the local oscillation frequency parameter of the second tuner is not less than 1 MHz.
Optionally, a frequency difference between the local oscillation offset parameter of the first tuner and the local oscillation frequency parameter of the second tuner is specifically 5 MHz.
A second aspect of the present application provides a satellite television signal modulation method applied to the satellite television signal receiving apparatus according to the first aspect of the present application, including:
respectively acquiring a first satellite signal and a second satellite signal through a first receiving antenna and a second receiving antenna;
performing signal attenuation processing on the second satellite signal according to an attenuation coefficient preset by an attenuator to obtain a third satellite signal;
and performing signal modulation on the first satellite signal by taking the first satellite signal as a main signal and the third satellite signal as a noise signal to obtain a satellite frequency band signal corresponding to a preset signal-to-noise ratio.
Optionally, before the acquiring the first satellite signal and the second satellite signal respectively by the first receiving antenna and the second receiving antenna, the method further includes:
and adjusting the local oscillation frequency parameter of the second tuner so that the local oscillation frequency parameter of the second tuner is lower than the local oscillation offset parameter of the first tuner.
Optionally, the adjusting the local oscillation frequency parameter of the second tuner specifically includes:
and adjusting the local frequency parameter of the second tuner according to the reference satellite signal received by the first receiving antenna and the difference between the narrowest bandwidth threshold of the reference satellite signal and a preset frequency difference threshold.
Optionally, the frequency difference threshold is specifically above 1 MHz.
Optionally, the frequency difference threshold is specifically 5 MHz.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a satellite television signal receiving arrangement, includes: the system comprises a first receiving antenna, a second receiving antenna, an attenuator, a combiner and a set top box; the output end of the first receiving antenna is connected with the first input end of the combiner; the output end of the second receiving antenna is connected with the second input end of the combiner, and the attenuator is connected between the output end of the second receiving antenna and the second input end of the combiner in series; and the output end of the combiner is connected with the signal input end of the set top box.
According to the method, the second receiving antenna is added on the basis of the original receiving equipment, the first receiving antenna and the second receiving antenna which are arranged in the same area are utilized to respectively obtain the same satellite signals, then the second satellite signals after attenuation processing are used as noise sources for artificial introduction, signal modulation is carried out on the second satellite signals and unprocessed first satellite signals, satellite frequency band signals corresponding to preset signal-to-noise ratios are obtained, the compatibility requirements of the existing satellite signal-to-noise ratio modulation on equipment hardware and communication protocols are reduced through modification of the receiving equipment, and the technical problem that the existing satellite television signal receiving device is poor in applicability is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a satellite television signal receiving apparatus provided in the present application;
fig. 2 is a schematic flowchart of a method for modulating satellite television signals according to the present application;
fig. 3 is a frequency spectrum diagram of a satellite television signal modulation method according to the present application;
wherein the reference numbers are as follows:
1. a first receiving antenna; 11. a first tuner; 2. a second receiving antenna; 21. a second tuner; 3. an attenuator; 4. a combiner; 5. a set-top box; 6. a display device.
Detailed Description
The embodiment of the application provides a satellite television signal receiving device and a modulation method, which are used for solving the technical problem that the existing satellite television signal receiving device is poor in applicability.
Signal-to-noise ratio: the ratio of signal power to noise power is often expressed in decibels. A higher signal-to-noise ratio of a device indicates that it generates less noise, and vice versa.
In the prior art, signal processing is usually performed through a communication protocol carried by a receiving device, so that the signal-to-noise ratio of a satellite signal is stabilized in a proper range, and the communication quality of the satellite signal is ensured. However, in practical applications, the inventor finds that there is a compatibility relationship between the communication protocol and the hardware device, the number of old devices in the currently used receiving devices still occupies a majority, and when the communication protocol developed for the new device is applied to the old device, it is difficult to achieve the expected communication quality, which results in a technical problem that the existing satellite signal receiving technology cannot be synchronously applied to the new device and the old device, and the applicability is poor.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a first embodiment of the present application provides a satellite television signal receiving apparatus, including: the system comprises a first receiving antenna 1, a second receiving antenna 2, an attenuator 3, a combiner 4 and a set top box 5;
the output end of the first receiving antenna 1 is connected with the first input end of the combiner 4;
the output end of the second receiving antenna 2 is connected with the second input end of the combiner 4, and the attenuator 3 is connected in series between the output end of the second receiving antenna 2 and the second input end of the combiner 4;
the output end of the combiner 4 is connected with the signal input end of the set-top box 5.
It should be noted that, the conventional satellite television signal receiving device basically includes a receiving antenna and a set-top box 5 device, and the satellite television signal receiving apparatus provided in this embodiment adds a new receiving branch on the basis of the existing receiving device, including the second receiving antenna 2, the attenuator 3 and the combiner 4.
First, the first receiving antenna 1 and the second receiving antenna 2 of this embodiment are disposed in the same signal radiation range, receive the same satellite signal, and are affected by the same environmental factors, and the included noise power ratio is also the same, when the signal is strong, the signal received by the first receiving antenna 1 and the signal received by the second receiving antenna 2 are both strong, and when the signal is weak, the signal received by the first receiving antenna 1 and the signal received by the second receiving antenna 2 are also weakened simultaneously, and then the signal received by the second receiving antenna 2 is subjected to signal attenuation processing through the attenuator 3, so as to obtain an attenuated signal with an attenuated amplitude, so as to be used as a noise signal. And the signal received by the first receiving antenna 1 is taken as a normal signal.
The satellite modulation signals are obtained by performing signal modulation on the satellite signals, the signal-to-noise ratio of the obtained satellite modulation signals can be stabilized within a preset range under the condition that the attenuation coefficient of the attenuator 3 is known, the quality of the signals is stabilized, and then the satellite modulation signals are played through the set top box 5 and the display device 6.
More specifically, the attenuator 3 is embodied as an adjustable attenuator 3, which can be adjusted to obtain a desired signal-to-noise ratio.
More specifically, the local oscillation frequency parameter of the second tuner 21 in the second receiving antenna 2 is lower than the local oscillation offset parameter of the first tuner 11 in the first receiving antenna 1.
It should be noted that, on the basis of the above-mentioned apparatus, the local oscillation frequency offset may be set for the tuner of the second receiving antenna 2, so that the phase of the noise signal peak after offset does not overlap with the phase of the normal signal peak, thereby further reducing the influence of the noise signal on the normal signal and improving the quality of the modulated signal.
Meanwhile, in order to ensure that the flatness of satellite signals received by the two high-frequency tuners is kept consistent in the whole frequency spectrum, the high-frequency tuners of the same brand and the same batch can be selected as much as possible.
More specifically, the frequency difference between the local oscillation offset parameter of the first tuner 11 and the local oscillation frequency parameter of the second tuner 21 is not less than 1 MHz.
More specifically, the frequency difference between the local oscillation offset parameter of the first tuner 11 and the local oscillation frequency parameter of the second tuner 21 is specifically 5 MHz.
According to the embodiment of the application, the second receiving antenna is added on the basis of the original receiving equipment, the first receiving antenna and the second receiving antenna which are arranged in the same area are used for respectively obtaining the same satellite signals, then the second satellite signals after attenuation processing are used as noise sources for artificial introduction, signal modulation is carried out on the second satellite signals and unprocessed first satellite signals, satellite frequency band signals corresponding to the preset signal-to-noise ratio are obtained, the compatibility requirements of the existing satellite signal-to-noise ratio modulation on equipment hardware and communication protocols are lowered, and the technical problem that the existing satellite television signal receiving device is poor in applicability is solved.
The above is a detailed description of an embodiment of a satellite television signal receiving apparatus provided in the present application, and the following is a detailed description of an embodiment of a satellite television signal modulation method provided in the present application.
Referring to fig. 2, a second embodiment of the present application provides a method for modulating a satellite television signal, which is applied to a satellite television signal receiving apparatus according to the first embodiment of the present application, and includes:
and 203, performing signal modulation on the first satellite signal by taking the first satellite signal as a main signal and the third satellite signal as a noise signal to obtain a satellite frequency band signal corresponding to a preset signal-to-noise ratio.
More specifically, before acquiring the first satellite signal and the second satellite signal respectively through the first receiving antenna and the second receiving antenna, the method further includes:
and 200, adjusting the local oscillation frequency parameter of the second tuner to enable the local oscillation frequency parameter of the second tuner to be lower than the local oscillation offset parameter of the first tuner.
More specifically, step 200 specifically includes:
and adjusting the local frequency parameter of the second tuner according to the reference satellite signal received by the first receiving antenna and the difference between the narrowest bandwidth threshold of the reference satellite signal and the preset frequency difference threshold.
In this embodiment, according to the satellite signal received by the first receiving antenna, the satellite signal may be a real-time satellite signal obtained when the second tuner is set, and the local oscillation frequency parameter of the second tuner is set according to a difference between a narrowest bandwidth threshold of the satellite signal and a preset frequency difference threshold, so that the local oscillation frequency parameter adjusted by the second tuner and the local oscillation frequency parameter of the reference satellite signal differ by a frequency difference threshold.
More specifically, the frequency difference threshold value of the present embodiment is specifically 1MHz or more, and specifically preferably 5 MHz.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A satellite television signal receiving apparatus, comprising: the system comprises a first receiving antenna, a second receiving antenna, an attenuator, a combiner and a set top box;
the output end of the first receiving antenna is connected with the first input end of the combiner;
the output end of the second receiving antenna is connected with the second input end of the combiner, and the attenuator is connected in series between the output end of the second receiving antenna and the second input end of the combiner, so that signal attenuation processing is performed on a second satellite signal through the attenuator to obtain a third satellite signal, wherein the second satellite signal is the satellite signal received by the second receiving antenna;
the output end of the combiner is connected with the signal input end of the set-top box, and the set-top box is used for performing signal modulation on a first satellite signal by taking the first satellite signal as a main signal and the third satellite signal as a noise signal to obtain a satellite frequency band signal corresponding to a preset signal-to-noise ratio, wherein the first satellite signal is the satellite signal received by the first receiving antenna.
2. A satellite television signal receiving apparatus according to claim 1, wherein the attenuator is in particular an adjustable attenuator.
3. The satellite television signal receiving device according to claim 1, wherein the local oscillator frequency parameter of the second tuner in the second receiving antenna is lower than the local oscillator offset parameter of the first tuner in the first receiving antenna.
4. The satellite television signal receiving device according to claim 3, wherein the difference between the local oscillation offset parameter of the first tuner and the local oscillation frequency parameter of the second tuner is not less than 1 MHz.
5. The satellite television signal receiving device according to claim 4, wherein a frequency difference between the local oscillation offset parameter of the first tuner and the local oscillation frequency parameter of the second tuner is specifically 5 MHz.
6. A satellite television signal modulation method applied to the satellite television signal receiving apparatus according to any one of claims 1 to 5, comprising:
respectively acquiring a first satellite signal and a second satellite signal through a first receiving antenna and a second receiving antenna;
performing signal attenuation processing on the second satellite signal according to an attenuation coefficient preset by an attenuator to obtain a third satellite signal;
and performing signal modulation on the first satellite signal by taking the first satellite signal as a main signal and the third satellite signal as a noise signal to obtain a satellite frequency band signal corresponding to a preset signal-to-noise ratio.
7. The method of claim 6, wherein the step of obtaining the first satellite signal and the second satellite signal via the first receiving antenna and the second receiving antenna further comprises:
and adjusting the local oscillation frequency parameter of the second tuner so that the local oscillation frequency parameter of the second tuner is lower than the local oscillation offset parameter of the first tuner.
8. The method according to claim 7, wherein the adjusting the local oscillation frequency parameter of the second tuner comprises:
and adjusting the local frequency parameter of the second tuner according to the reference satellite signal received by the first receiving antenna and the difference between the narrowest bandwidth threshold of the reference satellite signal and a preset frequency difference threshold.
9. The method according to claim 8, wherein the frequency difference threshold is greater than 1 MHz.
10. The method according to claim 9, wherein the frequency difference threshold is in particular 5 MHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010108541.1A CN111294573B (en) | 2020-02-21 | 2020-02-21 | Satellite television signal receiving device and modulation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010108541.1A CN111294573B (en) | 2020-02-21 | 2020-02-21 | Satellite television signal receiving device and modulation method |
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| CN111294573A CN111294573A (en) | 2020-06-16 |
| CN111294573B true CN111294573B (en) | 2021-06-18 |
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| CN109560366A (en) * | 2017-09-25 | 2019-04-02 | 周雅莉 | A kind of Variable Polarization Antenna and Variable Polarization Antenna array |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015109055A1 (en) * | 2014-01-15 | 2015-07-23 | Alki Andrew David | Individualized satellite transmission systems and remote viewing systems |
| CN205961329U (en) * | 2016-08-05 | 2017-02-15 | 北京华信泰科技股份有限公司 | Satellite signal processor |
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2020
- 2020-02-21 CN CN202010108541.1A patent/CN111294573B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203747926U (en) * | 2013-12-19 | 2014-07-30 | 深圳创维数字技术股份有限公司 | Multiple satellite signal receiving apparatus and system |
| CN106060678A (en) * | 2016-02-18 | 2016-10-26 | 泰斗微电子科技有限公司 | Direct-broadcast satellite television broadcast receiving system LNB (Low Noise Block) module and satellite television set top box |
| CN106101665A (en) * | 2016-08-05 | 2016-11-09 | 北京华信泰科技股份有限公司 | A kind of satellite-signal processor |
| CN106646528A (en) * | 2016-11-03 | 2017-05-10 | 中国科学院云南天文台 | System and method of eliminating interference on navigation signals by solar radio burst based on auxiliary antenna |
| CN109560366A (en) * | 2017-09-25 | 2019-04-02 | 周雅莉 | A kind of Variable Polarization Antenna and Variable Polarization Antenna array |
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| CN111294573A (en) | 2020-06-16 |
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