CN203590326U - Multichannel terrestrial digital television gap filter - Google Patents
Multichannel terrestrial digital television gap filter Download PDFInfo
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- CN203590326U CN203590326U CN201320624927.3U CN201320624927U CN203590326U CN 203590326 U CN203590326 U CN 203590326U CN 201320624927 U CN201320624927 U CN 201320624927U CN 203590326 U CN203590326 U CN 203590326U
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- multichannel
- frequency
- power amplifier
- filter
- digital television
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Abstract
The utility model discloses a multichannel terrestrial digital television gap filter, and relates to the broadcast transmission technology field. The multichannel terrestrial digital television gap filter comprises a power amplifier pusher, a final-stage power amplifier, an isolator and a broad band filter which are successively connected, and is structurally characterized in that the multichannel terrestrial digital television gap filter also comprises a multichannel reception and frequency conversion module, and an input signal is connected to an input terminal of the power amplifier pusher through the multichannel reception and frequency conversion module; the multichannel reception and frequency conversion module comprises a low noise amplifier, a mixer, a sound surface wave filter, an analog-digital converter, a field programmable gate array algorithm processor, a low pass filter, a quadrature modulation and frequency converter and a power amplifier which are successively connected; and a crystal oscillator is respectively input to the mixer and the quadrature modulation and frequency converter through a voltage-controlled oscillator, and the field programmable gate array algorithm processor is connected with the voltage-controlled oscillator. The multichannel reception and frequency conversion module is used as a frequency selection and promotion portion of the gap filter, covering demand of multiple programs is satisfied, and the multichannel terrestrial digital television gap filter is convenient to use and excellent in signal performance.
Description
Technical field
The utility model relates to broadcast transmission technical field, and particularly multichannel terrestrial DTV is mended some device.
Background technology
In the middle of terrestrial DTV is mended some covering, mend the related number of programs in some area a lot, an independent passage or channel can not meet the needs of actual covering, if all adopt the equipment of individual passage or channel to cover, the number of devices needing so can be a lot, increased undoubtedly the expense of mending point.For a change this situation just must be developed multichannel or the benefit point device of channel, the equipment of a plurality of channels is dissolved in the middle of a channel.
In prior art, common way is to mend point device input placement filter, then through mixer, exporting a road hybrid radio frequency signal, then by low noise amplifier, then pass through final power amplifier.Although above-mentioned way cost compare is cheap, the performance index of equipment are non-constant.The impact that is subject to input signal in the middle of practical application is very large, and the condition of use is also very harsh.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of multichannel terrestrial DTV and mends some device.It adopts multichannel reception, frequency-variable module as frequency-selecting and the pushing portion of mending some device, meets the needs that Polymera covers, and has feature easy to use, signal performance is excellent.
In order to reach foregoing invention object, the technical solution of the utility model realizes as follows:
Multichannel terrestrial DTV is mended some device, and it comprises power amplifier pusher, final power amplifier, isolator and the broadband filter connecting successively.Power-supply system is given respectively each device power supply, and control system is controlled each device respectively.Its design feature is that it also comprises, and multichannel receives, frequency-variable module, the input that input signal process multichannel receives, frequency-variable module is connected to power amplifier pusher.Multichannel receives, frequency-variable module comprises low noise amplifier, frequency mixer, SAW (Surface Acoustic Wave) filter, analog to digital converter, field programmable gate array processor, low pass filter, quadrature modulation and frequency converter and the power amplifier connecting successively.Crystal oscillator is input to respectively frequency mixer and quadrature modulation and frequency converter by voltage controlled oscillator, and field programmable gate array processor is connected with voltage controlled oscillator.
The utility model, owing to having adopted said structure, has been realized frequency-selecting, filtering, sampling, modulation and the frequency conversion function of a plurality of passages in the middle of terrestrial DTV is mended some device.Solved the problem that multichannel terrestrial DTV is mended some device index error, received signal limitation.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Fig. 2 is multichannel reception, frequency-variable module schematic diagram in the utility model;
Fig. 3 is the test design sketch of mending some device in the utility model embodiment;
Fig. 4 is frequency conversion design sketch in the utility model embodiment.
Embodiment
Referring to Fig. 1 and Fig. 2, the utility model Digital Television is mended some device and is comprised multichannel reception, frequency-variable module 11, power amplifier pusher 12, final power amplifier 13, isolator 17 and the broadband filter 14 connecting successively.Power-supply system 15 is given respectively each device power supply, and control system 16 is controlled each device respectively.Input signal is connected to the input of power amplifier pusher 12 through multichannel reception, frequency-variable module 11.Multichannel receives, frequency-variable module 11 comprises low noise amplifier 1, frequency mixer 2, SAW (Surface Acoustic Wave) filter 3, analog to digital converter 4, field programmable gate array processor 5, low pass filter 6, quadrature modulation and frequency converter 7 and the power amplifier 8 connecting successively.Crystal oscillator 10 is input to respectively frequency mixer 2 and quadrature modulation and frequency converter 7 by voltage controlled oscillator 9, and field programmable gate array processor 5 is connected with voltage controlled oscillator 9
The utility model in the preparation, by two-way such scheme multichannel receive, frequency-variable module 11 is arranged in two printed boards, is set to dash receiver and expelling plate.Four such printed boards are coupled together by a public printed board again, form frequency-selecting and the frequency-variable module of four paths, dash receiver is responsible for frequency-selecting, filtering and digital sample, expelling plate be responsible for to the data of digital sample calculate, modulation and frequency conversion.In the utility model, because a plurality of passages have been carried out integrated, the module that therefore adopts this kind of method to make is very small and exquisite, makes this module be placed in an outside transmitter case and become possibility, and the multichannel Digital Television of so very convenient formation is mended a some device.
In the utility model when work,, the radiofrequency signal that first multichannel is mixed enters low noise amplifier 1 carries out signal and amplifies for the first time, the mixing of the signal being exaggerated by frequency mixer 2 by under change to 70MHz.In the position of 70MHz, we are provided with the SAW (Surface Acoustic Wave) filter 3 of a 8MHz, and needed channel is leached.Then carry out digital sample, the data after sampling are processed again by field programmable gate array processor 5.Data after processing are carried out quadrature modulation and frequency conversion again, finally by overpower amplifier 8, amplify.Referring to Fig. 3 and Fig. 4, adopt the effect performance of the utility model Digital Television benefit point device very good.More than the band of whole output signal matches and reached 40dB, and the band of common pattern only matches in 35dB left and right, and the band of whole frequency spectrum is very clean outward in addition, does not almost have what clutter to produce, if adopt common form, the clutter outside band can be very many.We see the shift frequency effect of Fig. 4 in addition, this kind of mode can be carried out shift frequency to any one channel, this is not accomplish in plain edition, plain edition or can not shift frequency, only to all channel while shift frequencies, and do not accomplish the operation to each channel, so to be significantly less than form of the present utility model in the flexibility ratio of common form.
Claims (1)
1. multichannel terrestrial DTV is mended some device, it comprises power amplifier pusher (12), final power amplifier (13), isolator (17) and the broadband filter (14) connecting successively, power-supply system (15) is given respectively each device power supply, and control system (16) is controlled each device respectively; It is characterized in that, it also comprises, and multichannel receives, frequency-variable module (11), and input signal is connected to the input of power amplifier pusher (12) through multichannel reception, frequency-variable module (11); Multichannel receives, frequency-variable module (11) comprises low noise amplifier (1), frequency mixer (2), SAW (Surface Acoustic Wave) filter (3), analog to digital converter (4), field programmable gate array processor (5), low pass filter (6), quadrature modulation and frequency converter (7) and the power amplifier (8) connecting successively, crystal oscillator (10) is input to respectively frequency mixer (2) and quadrature modulation and frequency converter (7) by voltage controlled oscillator (9), and field programmable gate array algorithm and processor (5) are connected with voltage controlled oscillator (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320624927.3U CN203590326U (en) | 2013-10-11 | 2013-10-11 | Multichannel terrestrial digital television gap filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320624927.3U CN203590326U (en) | 2013-10-11 | 2013-10-11 | Multichannel terrestrial digital television gap filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203590326U true CN203590326U (en) | 2014-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320624927.3U Expired - Fee Related CN203590326U (en) | 2013-10-11 | 2013-10-11 | Multichannel terrestrial digital television gap filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203590326U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580955A (en) * | 2013-10-11 | 2015-04-29 | 北京同方吉兆科技有限公司 | Multi-channel terrestrial digital television gap filler |
-
2013
- 2013-10-11 CN CN201320624927.3U patent/CN203590326U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580955A (en) * | 2013-10-11 | 2015-04-29 | 北京同方吉兆科技有限公司 | Multi-channel terrestrial digital television gap filler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20191011 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |