CN104580955A - Multi-channel terrestrial digital television gap filler - Google Patents
Multi-channel terrestrial digital television gap filler Download PDFInfo
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- CN104580955A CN104580955A CN201310471713.1A CN201310471713A CN104580955A CN 104580955 A CN104580955 A CN 104580955A CN 201310471713 A CN201310471713 A CN 201310471713A CN 104580955 A CN104580955 A CN 104580955A
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- frequency
- power amplifier
- channel
- gap filler
- digital television
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- 239000000945 filler Substances 0.000 title abstract 6
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 238000010897 surface acoustic wave method Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
A multi-channel terrestrial digital television gap filler relates to the technical field of broadcast transmission. The multi-channel terrestrial digital television gap filler comprises a power amplifier pusher, a final-stage power amplifier, an isolator and a broadband filter which are successively connected, and is structurally characterized in that the multi-channel terrestrial digital television gap filler also comprises a multi-channel reception and frequency conversion module, and an input signal is input to an input terminal of the power amplifier pusher through the multi-channel reception and frequency conversion module; the multi-channel 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 connected 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 to the voltage-controlled oscillator. The multi-channel reception and frequency conversion module is used as a frequency selection and promotion portion of the gap filler, the demand of covering multiple programs is satisfied, and the multi-channel terrestrial digital television gap filler is convenient to use and excellent in signal performance.
Description
Technical field
The present invention relates to technical field of broadcast transmission, particularly multichannel terrestrial DTV mends some device.
Background technology
Mend in the middle of Vertex cover at terrestrial DTV, mend the number of programs of point involved by 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 so needed can be a lot, add the expense of mending point undoubtedly.For a change this situation just must develop the benefit point device of multichannel or channel, the equipment of multiple channel is dissolved in the middle of a channel.
In prior art, common way places filter at benefit point device input, then exports a road hybrid radio frequency signal through mixer, then by low noise amplifier, then through final power amplifier.Although above-mentioned way cost compare is cheap, the performance index non-constant of equipment.The impact being 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 object of this invention is to provide a kind of multichannel terrestrial DTV and mend 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, has easy to use, that signal performance is excellent feature.
In order to reach foregoing invention object, technical scheme of the present invention realizes as follows:
A kind of multichannel terrestrial DTV mends some device, and it comprises the power amplifier pusher, final power amplifier, isolator and the broadband filter that connect successively.Power-supply system powers to respectively each device, and control system controls each device respectively.Its design feature is, it also comprises, and multichannel receives, frequency-variable module, and input signal receives through multichannel, frequency-variable module is connected to the input of power amplifier pusher.Multichannel receives, frequency-variable module comprise connect successively low noise amplifier, frequency mixer, SAW (Surface Acoustic Wave) filter, analog to digital converter, field programmable gate array algorithm and processor, low pass filter, quadrature modulation and frequency converter and power amplifier.Crystal oscillator is input to frequency mixer and quadrature modulation and frequency converter respectively by voltage controlled oscillator, and field programmable gate array algorithm and processor are connected with voltage controlled oscillator.
The present invention, owing to have employed said structure, achieves the frequency-selecting of multiple passage in the middle of terrestrial DTV benefit point device, filtering, sampling, modulation and frequency conversion function.Solve the problem that multichannel terrestrial DTV is mended some device index error, limited to by Received signal strength.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is multichannel reception, frequency-variable module schematic diagram in the present invention;
Fig. 3 is the test design sketch mending some device in the embodiment of the present invention;
Fig. 4 is frequency conversion design sketch in the embodiment of the present invention.
Embodiment
Referring to Fig. 1 and Fig. 2, Digital Television of the present invention mend some device comprise connect successively multichannel reception, frequency-variable module 11, power amplifier pusher 12, final power amplifier 13, isolator 17 and broadband filter 14.Power-supply system 15 powers to respectively each device, and control system 16 controls each device respectively.Input signal receives through multichannel, frequency-variable module 11 is connected to the input of power amplifier pusher 12.Multichannel receives, frequency-variable module 11 comprise connect successively low noise amplifier 1, frequency mixer 2, SAW (Surface Acoustic Wave) filter 3, analog to digital converter 4, field programmable gate array algorithm and processor 5, low pass filter 6, quadrature modulation and frequency converter 7 and power amplifier 8.Crystal oscillator 10 is input to frequency mixer 2 and quadrature modulation and frequency converter 7 respectively by voltage controlled oscillator 9, and field programmable gate array algorithm and processor 5 are connected with voltage controlled oscillator 9
The present invention in the preparation, by two-way such scheme multichannel receives, frequency-variable module 11 is arranged in two pieces of printed boards, be set to dash receiver and expelling plate.Four pieces of such printed boards coupled together by a public printed board, form frequency-selecting and the frequency-variable module of four paths, namely dash receiver is responsible for frequency-selecting, filtering and digital sample, and expelling plate is responsible for calculating the data of digital sample, modulating and frequency conversion again.In the present invention, because carried out by multiple passage integrated, the module therefore adopting this kind of method to make is very small and exquisite, and to make this module to be placed in an outside transmitter case become possibility, and the multichannel Digital Television of so very convenient formation mends a some device.
When the present invention works, the radiofrequency signal of first multichannel mixing enters low noise amplifier 1 and carries out signal and amplify for the first time, the signal be exaggerated by the mixing of 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, are leached by required channel.Then carry out digital sample, the data after sampling are processed again by field programmable gate array algorithm and processor 5.Data after process carry out quadrature modulation and frequency conversion again, eventually pass power amplifier 8 and amplify.Referring to Fig. 3 and Fig. 4, adopt the effect performance of Digital Television of the present invention benefit point device very good.The band of whole output signal matches and reaches more than 40dB, and the band of common form matches only at about 35dB, and the band of whole frequency spectrum is outer very clean in addition, and almost do not 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 carry out shift frequency to any one channel, this not accomplished in plain edition, plain edition or can not shift frequency, only to all channels shift frequency simultaneously, and do not accomplish the operation to each channel, so the flexibility ratio of common form to be significantly less than form of the present invention.
Claims (1)
1. a multichannel terrestrial DTV mends some device, it comprises the power amplifier pusher (12), final power amplifier (13), isolator (17) and the broadband filter (14) that connect successively, power-supply system (15) powers to respectively each device, and control system (16) controls each device respectively; It is characterized in that, it also comprises, and multichannel receives, frequency-variable module (11), and input signal receives through multichannel, frequency-variable module (11) is connected to the input of power amplifier pusher (12); Multichannel receives, frequency-variable module (11) comprise connect successively low noise amplifier (1), frequency mixer (2), SAW (Surface Acoustic Wave) filter (3), analog to digital converter (4), field programmable gate array algorithm and processor (5), low pass filter (6), quadrature modulation and frequency converter (7) and power amplifier (8), crystal oscillator (10) is input to frequency mixer (2) and quadrature modulation and frequency converter (7) respectively 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 |
|---|---|---|---|
| CN201310471713.1A CN104580955A (en) | 2013-10-11 | 2013-10-11 | Multi-channel terrestrial digital television gap filler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310471713.1A CN104580955A (en) | 2013-10-11 | 2013-10-11 | Multi-channel terrestrial digital television gap filler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104580955A true CN104580955A (en) | 2015-04-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310471713.1A Pending CN104580955A (en) | 2013-10-11 | 2013-10-11 | Multi-channel terrestrial digital television gap filler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104580955A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201274529Y (en) * | 2008-09-11 | 2009-07-15 | 福建三元达通讯股份有限公司 | Frequency selecting and converting forwarding device for digital television |
| CN101742133A (en) * | 2009-12-05 | 2010-06-16 | 桂林市思奇通信设备有限公司 | Digital television single frequency network radio frequency adapter and broadband network system thereof |
| US20110170632A1 (en) * | 2010-01-08 | 2011-07-14 | Broadcom Corporation | Digital Up-Converter and N-Channel Modulator With Flexible Association of QAM Generation Resources to Narrowcast and Broadcast Frequencies |
| CN102420573A (en) * | 2011-12-02 | 2012-04-18 | 熊猫电子集团有限公司 | Method for setting cluster communication power amplification and power amplifier |
| CN203590326U (en) * | 2013-10-11 | 2014-05-07 | 北京同方吉兆科技有限公司 | Multichannel terrestrial digital television gap filter |
-
2013
- 2013-10-11 CN CN201310471713.1A patent/CN104580955A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201274529Y (en) * | 2008-09-11 | 2009-07-15 | 福建三元达通讯股份有限公司 | Frequency selecting and converting forwarding device for digital television |
| CN101742133A (en) * | 2009-12-05 | 2010-06-16 | 桂林市思奇通信设备有限公司 | Digital television single frequency network radio frequency adapter and broadband network system thereof |
| US20110170632A1 (en) * | 2010-01-08 | 2011-07-14 | Broadcom Corporation | Digital Up-Converter and N-Channel Modulator With Flexible Association of QAM Generation Resources to Narrowcast and Broadcast Frequencies |
| CN102420573A (en) * | 2011-12-02 | 2012-04-18 | 熊猫电子集团有限公司 | Method for setting cluster communication power amplification and power amplifier |
| CN203590326U (en) * | 2013-10-11 | 2014-05-07 | 北京同方吉兆科技有限公司 | Multichannel terrestrial digital television gap filter |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |
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| WD01 | Invention patent application deemed withdrawn after publication |