CN104092965A - System and method for improving indoor coverage rate of terrestrial digital television signals - Google Patents
System and method for improving indoor coverage rate of terrestrial digital television signals Download PDFInfo
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- CN104092965A CN104092965A CN201410299717.0A CN201410299717A CN104092965A CN 104092965 A CN104092965 A CN 104092965A CN 201410299717 A CN201410299717 A CN 201410299717A CN 104092965 A CN104092965 A CN 104092965A
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- low noise
- noise amplifier
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- television signal
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Abstract
The invention relates to a system and method for improving the indoor coverage rate of terrestrial digital television signals. The system comprises a receiving antenna, a low pass filter, multiple stages of low noise amplifiers and a transmitting antenna. The receiving antenna, the low pass filter, the multiple stages of low noise amplifiers and the transmitting antenna are connected in sequence. The receiving antenna is arranged outdoors and used for receiving the outdoor terrestrial digital television signals. The low pass filter is used for filtering out interference signals in the received terrestrial digital television signals. The multiple stages of low noise amplifiers are used for amplifying the terrestrial digital television signals. The low noise amplifier of the last stage is a bypass mode low noise amplifier and used for avoiding saturation. The transmitting antenna is arranged indoors and used for transmitting the received terrestrial digital television signals indoors. The multiple stages of low noise amplifiers are adopted to amplify the outdoor signals, the signals are transmitted indoors, and therefore effective coverage of the terrestrial digital television indoor signals is achieved.
Description
Technical field
The present invention relates to digital television information transmission technique field, particularly relate to a kind of system and method that improves the indoor coverage rate of ground digital television signal.
Background technology
At present, TV has become the requisite household electrical appliance of numerous families, and people are also more and more higher to the requirement of TV signal.Most family all stays in the room of armored concrete, TV generally from window away from, and the glass of a lot of windows is at present all with signal buffer action.Therefore,, when ground digital signal penetrates window and enters depths, room, signal attenuation meeting is very large, that is to say the non-constant of indoor coverage situation of terrestrial DTV, causes the indoor reception of terrestrial DTV very difficult.
Prior art adopts the low power some technology of mending of directly putting, and as shown in Figure 1, the signal that reception antenna 1 receives first carries out filtering processing, amplifies afterwards, by transmitting antenna 4, is launched, and transmitting power is generally 1W-10W left and right, is not suitable for domestic. applications, and has following shortcoming:
1, straight discharge technique, for adapting to transmitting power, must add band-pass filter, increases design cost.
2, because transmitting power requires to be generally greater than 1W, so the bandwidth of band pass filter is not too large.Therefore the frequency range that each repeater is supported is narrow, generally each one of physical channel needs is directly put equipment.
3, transmitting power requires to be generally greater than 1W, is not suitable for domestic. applications.
4, directly putting equipment is anti-stop signal self-excitation, and transmitting antenna needs the isolation processing of larger distance in reception antenna.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of system and method that improves the indoor coverage rate of ground digital television signal, the problem improving for solving the indoor coverage rate of terrestrial DTV.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of system that improves the indoor coverage rate of ground digital television signal, comprises the reception antenna, low pass filter, multi-stage low noise amplifier and the transmitting antenna that connect successively;
Described reception antenna, it is arranged on outdoor, for the ground digital television signal outside receiving chamber, and is transferred to described low pass filter;
Described low pass filter, the interference signal of the ground digital television signal that it receives for filtering, and the ground digital television signal after filtering interference signals is transferred to described multi-stage low noise amplifier;
Described multi-stage low noise amplifier, it is for amplifying ground digital television signal, and the ground digital television signal after amplifying is transferred to described transmitting antenna; Its afterbody low noise amplifier adopts the low noise amplifier with bypass mode, for avoiding the saturated of afterbody low noise amplifier;
Described transmitting antenna, will be arranged on indoor, for the ground digital television signal receiving in indoor transmitting.
On the basis of technique scheme, the present invention can also do following improvement.
Further, between described multi-stage low noise amplifier and described transmitting antenna, be provided with DC power supply coupling module, for realizing direct-current coupling between the signal output part of multi-stage low noise amplifier and transmitting antenna.
Further, described reception antenna is plate type antenna.
Further, described transmitting antenna is sucker antenna.
Further, described low pass filter comprises the first electric capacity, the second electric capacity and inductance, one end of one end of described the first electric capacity and described the second electric capacity is electrically connected to, and the signal input part that the other end of described the first electric capacity is described low pass filter, the signal output part that the other end of described the second electric capacity is described low pass filter; One end of described inductance is connected between described the first electric capacity and described the second electric capacity, other end ground connection.
Further, described multi-stage low noise amplifier has three grades of low noise amplifiers.
Further, also comprise a switch, it connects afterbody low noise amplifier, for controlling afterbody low noise amplifier, selects bypass mode or amplification mode.
Technical scheme of the present invention also comprises a kind of method that improves the indoor coverage rate of ground digital television signal, comprising:
Step 1, is arranged on reception antenna outdoor, starts the ground digital television signal outside receiving chamber;
Step 2, the interference signal in the ground digital television signal that the filtering of employing low pass filter receives;
Step 3, adopts multi-stage low noise amplifier to amplify the ground digital television signal after filtering interference signals, and according to the intensity of ground digital television signal, afterbody low noise amplifier is set and adopts bypass mode or amplification mode;
Step 4, by being arranged on the ground digital television signal of indoor transmission antennas transmit after multi-stage low noise amplifier amplifies.
Further, also comprise: carry out the signal output part of multi-thread low noise amplifier and the direct-current coupling between transmitting antenna.
Further, a switch of selecting bypass mode or amplification mode for controlling afterbody low noise amplifier is set, bypass mode or the amplification mode of afterbody low noise amplifier is manually set by this switch.
The invention has the beneficial effects as follows: technical solution of the present invention is the method that adopts multi-stage low noise amplifier, amplifies outdoor signal, and in indoor transmitting, achieves effective covering of terrestrial DTV indoor signal.For preventing the saturated of rear class low noise amplifier, the low pass filter that meets the demands that adopted inductance, electric capacity simple designs.And the present invention can be according to the difference of outdoor signal intensity, whether select bypass afterbody low noise amplifier, meet the application of more occasions.In addition, the filter that the present invention adopts, amplifier etc. are all very small and exquisite, and for simplifying the wiring of window, have adopted the powering mode of direct-current coupling.
Accompanying drawing explanation
Fig. 1 is the structural representation of the system of indoor reception ground digital television signal in prior art;
Fig. 2 is the structural representation of the system of a kind of indoor coverage rate that improves ground digital television signal of the present invention;
Fig. 3 is the structural representation of low pass filter in the embodiment of the present invention;
Fig. 4 is the schematic flow sheet of the method for a kind of indoor coverage rate that improves ground digital television signal of the present invention.
In accompanying drawing, the list of parts of each label representative is as follows:
1, reception antenna, 2, low pass filter, 3, multi-stage low noise amplifier, 4, transmitting antenna, 5, DC power supply coupling module, 6, switch.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 2, the present embodiment has provided a kind of system that improves the indoor coverage rate of ground digital television signal, comprises successively the reception antenna 1 connecting, low pass filter 2, multi-stage low noise amplifier 3 and a transmitting antenna 4;
Described reception antenna 1, it is arranged on outdoor, for the ground digital television signal outside receiving chamber, and is transferred to described low pass filter;
Described low pass filter 2, the interference signal of the ground digital television signal that it receives for filtering, and the ground digital television signal after filtering interference signals is transferred to described multi-stage low noise amplifier;
Described multi-stage low noise amplifier 3, it is for amplifying ground digital television signal, and the ground digital television signal after amplifying is transferred to described transmitting antenna; Its afterbody low noise amplifier adopts the low noise amplifier with bypass mode, for avoiding the saturated of afterbody low noise amplifier;
Described transmitting antenna 4, will be arranged on indoor, for the ground digital television signal receiving in indoor transmitting.
In addition, between described multi-stage low noise amplifier and described transmitting antenna, be provided with DC power supply coupling module 5, for realizing direct-current coupling between the signal output part of multi-stage low noise amplifier and transmitting antenna.Direct-current coupling technology is mature technology, can, according to actual conditions, configure suitable DC power supply coupling module.In addition, this system also comprises a switch 6, and it connects afterbody low noise amplifier, for controlling afterbody low noise amplifier, selects bypass mode or amplification mode.
In order to adapt to domestic. applications, can adopt plate type antenna as reception antenna, be arranged on outside window.Plate type antenna can tiltedly stand on windowsill, neither affects the attractive in appearance of the original window of family, has realized again the reliable reception of signal.In addition, can adopt sucker antenna that a length is greater than about 10cm as transmitting antenna, standing-wave ratio is preferably less than 2dB.For realizing the isolation of transmitting antenna and reception antenna, when place the position of transmitting antenna, preferably partition wall and establishing, can realize simple antenna isolation like this.The transmit signal strength of transmitting antenna, between-5 to-25dBm, can meet the indoor covering of ground digital television signal well, has greatly improved the stability of the indoor reception of terrestrial DTV.
At present, airborne signal comprises the multiple unlimited signals such as signal of simulated audio signal, anolog TV signals, Digital Television, and larger simulated audio signal, the anolog TV signals of power generally all concentrate on VHF frequency range, the indoor covering of these signals for terrestrial DTV, be interference signal, therefore need carry out filtering by low pass filter.
Low pass filter is except filtering interference signals, can also prevent the saturated of low noise amplifier, as shown in Figure 3, the low pass filter of the present embodiment structure comprises the first capacitor C 1, the second capacitor C 2 and inductance L, one end of one end of described the first capacitor C 1 and described the second capacitor C 2 is electrically connected to, and the signal input part that the other end of described the first capacitor C 1 is described low pass filter, the signal output part that the other end of described the second capacitor C 2 is described low pass filter; One end of described inductance L is connected between described the first capacitor C 1 and described the second capacitor C 2, other end ground connection.The present embodiment has adopted the elements such as inductance, electric capacity to realize low-pass filtering, has both reduced cost, again filtering useless signal in space.Low pass filter is as shown in Figure 3 the preferred low pass filter of the present embodiment, also can adopt low pass filter conventional in all the other prior arts.
Preferably adopt low noise amplifier more than three grades, first order low noise amplifier can be selected MAX2640 chip, and it is a low noise amplifier cheaply, supply power voltage be+2.7V extremely+5.5V, power consumption only has 3.5mA.MAX2640 operating frequency range 300MHz is to 1500MHz, and typical gain is 15.1dB.For increasing indoor coverage, front two-stage adopts the mode of 2 MAX2640 amplifiers cascade.Afterbody low noise amplifier is selected RF2884, and its typical gain amplifier is 15dB, and when signal is larger, for preventing amplifier saturation, RF2884 can adopt bypass mode.The outdoor signal intensity of general antenna reception be-50 to-70dBm, and after three grades of amplifications, signal is about degree-5 to-25dBm, the transmission of very applicable indoor signal.But in some letter stronger region of signal, for example, be greater than-50dBm, be easy to cause the saturated of third level low noise amplifier.For this reason, adopted can bypass low noise amplifier, when signal is stronger, directly by the bypass of third level low noise amplifier.
The system of the indoor coverage rate of the raising ground digital television signal described in the present embodiment needs direct current supply, for the installation of simplifying the wiring of window and realizing equipment, place and simplify, the powering mode that its power supply can adopt delivery outlet and antenna to carry out direct-current coupling, device interior is realized the way of decoupling zero, realizes the simplification of supply lines.
As shown in Figure 4, the step that adopts said system to improve the indoor coverage rate of ground digital television signal comprises:
Step 1, is arranged on reception antenna outdoor, starts the ground digital television signal outside receiving chamber;
Step 2, the interference signal in the ground digital television signal that the filtering of employing low pass filter receives;
Step 3, adopts multi-stage low noise amplifier to amplify the ground digital television signal after filtering interference signals, and according to the intensity of ground digital television signal, afterbody low noise amplifier is set and adopts bypass mode or amplification mode;
Step 4, by being arranged on the ground digital television signal of indoor transmission antennas transmit after multi-stage low noise amplifier amplifies.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a system that improves the indoor coverage rate of ground digital television signal, is characterized in that, comprises the reception antenna, low pass filter, multi-stage low noise amplifier and the transmitting antenna that connect successively;
Described reception antenna, it is arranged on outdoor, for the ground digital television signal outside receiving chamber, and is transferred to described low pass filter;
Described low pass filter, the interference signal of the ground digital television signal that it receives for filtering, and the ground digital television signal after filtering interference signals is transferred to described multi-stage low noise amplifier;
Described multi-stage low noise amplifier, it is for amplifying ground digital television signal, and the ground digital television signal after amplifying is transferred to described transmitting antenna; The afterbody low noise amplifier of this multi-stage low noise amplifier adopts the low noise amplifier with bypass mode, for avoiding the saturated of afterbody low noise amplifier;
Described transmitting antenna, will be arranged on indoor, for the ground digital television signal receiving in indoor transmitting.
2. system according to claim 1, is characterized in that, between described multi-stage low noise amplifier and described transmitting antenna, is provided with DC power supply coupling module, for realizing direct-current coupling between the signal output part of multi-stage low noise amplifier and transmitting antenna.
3. system according to claim 1, is characterized in that, described reception antenna is plate type antenna.
4. system according to claim 1, is characterized in that, described transmitting antenna is sucker antenna.
5. system according to claim 1, it is characterized in that, described low pass filter comprises the first electric capacity, the second electric capacity and inductance, one end of one end of described the first electric capacity and described the second electric capacity is electrically connected to, and the signal input part that the other end of described the first electric capacity is described low pass filter, the signal output part that the other end of described the second electric capacity is described low pass filter; One end of described inductance is connected between described the first electric capacity and described the second electric capacity, other end ground connection.
6. system according to claim 1, is characterized in that, described multi-stage low noise amplifier has three grades of low noise amplifiers.
7. according to arbitrary described system in claim 1 to 6, it is characterized in that, also comprise a switch, it connects afterbody low noise amplifier, for controlling afterbody low noise amplifier, selects bypass mode or amplification mode.
8. a method that improves the indoor coverage rate of ground digital television signal, is characterized in that, comprising:
Step 1, is arranged on reception antenna outdoor, starts the ground digital television signal outside receiving chamber;
Step 2, the interference signal in the ground digital television signal that the filtering of employing low pass filter receives;
Step 3, adopts multi-stage low noise amplifier to amplify the ground digital television signal after filtering interference signals, and according to the intensity of ground digital television signal, afterbody low noise amplifier is set and adopts bypass mode or amplification mode;
Step 4, by being arranged on the ground digital television signal of indoor transmission antennas transmit after multi-stage low noise amplifier amplifies.
9. method according to claim 8, is characterized in that, also comprises: carry out the signal output part of multi-thread low noise amplifier and the direct-current coupling between transmitting antenna.
10. method according to claim 8 or claim 9, it is characterized in that, a switch of selecting bypass mode or amplification mode for controlling afterbody low noise amplifier is set, bypass mode or the amplification mode of afterbody low noise amplifier is manually set by this switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299717.0A CN104092965A (en) | 2014-06-26 | 2014-06-26 | System and method for improving indoor coverage rate of terrestrial digital television signals |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299717.0A CN104092965A (en) | 2014-06-26 | 2014-06-26 | System and method for improving indoor coverage rate of terrestrial digital television signals |
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| CN104092965A true CN104092965A (en) | 2014-10-08 |
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| CN201410299717.0A Pending CN104092965A (en) | 2014-06-26 | 2014-06-26 | System and method for improving indoor coverage rate of terrestrial digital television signals |
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Cited By (4)
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| CN104410802A (en) * | 2014-12-11 | 2015-03-11 | 成都新光微波工程有限责任公司 | Digital television emission system |
| CN104469203A (en) * | 2014-12-11 | 2015-03-25 | 成都新光微波工程有限责任公司 | Digital television emission managing system |
| CN106941370A (en) * | 2017-05-17 | 2017-07-11 | 江苏亨鑫科技有限公司 | Indoor millimeter-wave signal enhancing method and system |
| CN107371070A (en) * | 2017-07-21 | 2017-11-21 | 广州珠江移动多媒体信息有限公司 | A kind of method that digital television signal mends point optimization covering |
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| CN104469203A (en) * | 2014-12-11 | 2015-03-25 | 成都新光微波工程有限责任公司 | Digital television emission managing system |
| CN106941370A (en) * | 2017-05-17 | 2017-07-11 | 江苏亨鑫科技有限公司 | Indoor millimeter-wave signal enhancing method and system |
| CN107371070A (en) * | 2017-07-21 | 2017-11-21 | 广州珠江移动多媒体信息有限公司 | A kind of method that digital television signal mends point optimization covering |
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