CN1233917A - Multiple and super high frequency TV transmission system - Google Patents
Multiple and super high frequency TV transmission system Download PDFInfo
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- CN1233917A CN1233917A CN 98112454 CN98112454A CN1233917A CN 1233917 A CN1233917 A CN 1233917A CN 98112454 CN98112454 CN 98112454 CN 98112454 A CN98112454 A CN 98112454A CN 1233917 A CN1233917 A CN 1233917A
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Abstract
The multichannel television transmission system with multchannel UHF adjacent frequency fore-end, coder, data modulation amplifier, multichannel adjacent frequency transmission unit of UHF high isolation and high linear, multichannel UHF televison high-frequency-amplification relay station and user receive controller. With the invention multichannel adjacent frequency television radio can be realized transmission on the UHF television frequency band 470-560 MHz, 606-798 MHz and charges management. The advantages are: low system cost, convenient construction, low user's fee, easy to e installed. It is especially suitable for mountain areas and countryside.
Description
The invention belongs to a kind of multiple wireless TV transmission system.Existing multi-channel television transmission system has the cable TV neighbour to keep pouring in communication system and multichannel microwave television transmission system (MMDS) etc., wherein the cable TV neighbour keeps pouring in that communication system transmission way is many, laser propagation effect good, but cost is also quite high, and difficulty of construction is big and be not suitable for resembling the multi-channel television covering problem that disperses the residential area the rural area with solving.MMDS multichannel microwave television transmission system then adopts multi-path adjacent frequency TV signal up-conversion to be modulated to 2.5～2.7GHZ microwave frequency band theaomni-directional transmission, the recipient is down-converted to the frequency range that television set can receive, can realize disperseing the multi-channel television covering problem in residential area like this, but owing to system frequency height, palpus adopt upper and lower converter technique, cost is still higher.Above-mentioned in addition two type systematics adopt the addressable mode of video scrambling mostly on toll administration, user terminal descrambling cost is higher, and promote difficulty in the rural area bigger.
The object of the present invention is to provide a kind of wireless multi-path television transmission system of low cost, guaranteeing under the prerequisite of transmission quality not second to cable television system and MMDS system, can also realize the addressable charge management, provide practical, economical and practical means for solving the paid multi-channel television covering problem in the diffusing residential area of rural five equilibrium.
Technical scheme of the present invention is: operating frequency adopts 470～566MHZ or 606～798MHZ superfrequency, multi-channel tv programs is carried out being launched every degree, high linear multi-path adjacent frequency radiating portion by the superfrequency height after the lower sideband modulation through neighbour's frequency front end, with a data channel each user is carried out encode management simultaneously, carry out paid service.The multiple and super high frequency TV is directly put relay station can enlarge signal cover.
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is the block diagram of system of the present invention.
Fig. 2 is 6 road super high frequency TV transmission system block diagrams.
Fig. 3 is a broadband type scheme block diagram.
Fig. 4 is high-power many merits synthetic schemes block diagram.
Fig. 5 is audio frequency, video independence power amplifier scheme block diagram.
Fig. 6 is that 6 road uhf televisions are directly put the relay station composition frame chart.
Fig. 7 receives the controller principle block diagram for the user.
As Fig. 1, multiple and super high frequency TV transmission system of the present invention is directly put relay station 5 and user by multiple and super high frequency adjacent front end 1, encoder 2, data-modulated amplifier 3, superfrequency high-isolation, high linear multi-path adjacent frequency radiating portion 4, multiple and super high frequency TV frequently and is received controller 6 and form.The audio frequency of each program source (A) signal and video (V) signal carry out the lower sideband modulation through the adjacent front end 1 frequently of multiple and super high frequency, and its reference carrier frequency is a channel in 470～566MHZ or the 606～798MHZ super high band.The lower sideband modulation is exactly that the sub-fraction of the whole and upper sideband of composite video signal lower sideband is modulated, because existing TV can only normally be watched the TV signal of upper sideband modulation (promptly sending the sub-fraction of the whole and lower sideband of composite video signal upper sideband), thereby reached the purpose that general television set is encrypted.It is data channel that the data that encoder 2 produces also are modulated at one of them channel through data-modulated amplifier 3, and amplified through power amplifier, formed the multi-path adjacent frequency ultrahigh-frequency signal like this, go out every height, high linear multi-path adjacent frequency radiating portion 4 amplifying emission through the superfrequency height again, at user's receiving terminal, the user receives controller 6 and under data channel control the lower sideband modulated television signal is reduced to the upper sideband modulated television signal, and user's television set is normally watched.The multiple and super high frequency TV is directly put relay station 5 and the multichannel electricity ultrahigh-frequency signal of receiving can be amplified and forward, and expands the coverage area.
Fig. 2 is 6 road super high frequency TV transmission system block diagrams.Comprise the adjacent front end frequently of 6 tunnel superfrequencies, encoder, the data-modulated amplifier, the superfrequency high-isolation, high linear 6 road neighbours take place frequently and penetrate part, 6 road uhf televisions directly put relay station and the user receives controller, the adjacent front end frequently of multi-channel television is with the audio signal A of 6 tunnel program source, vision signal V carries out the modulation of A/V carrier wave lower sideband respectively, the adjacent front end frequently of each superfrequency is exported one road uhf television signal, and (frequency range is 470～566MHZ or 606～798MHZ), take a UHF television channel, comprising pix carrier and sound carrier, connect intermediate frequency processor behind each adjacent frequency front end, alliteration surface wave filter and two phase-locked loop, improve the output signal frequency stability, had high anti-monkey chatter, the mirror image interference performance.Encoder is subscriber-coded to each, produce a series of user codes and subscriber control information sign indicating number, it is on the data channel that the data-modulated amplifier is modulated to a UHF channel with station address and subscriber control information sign indicating number, and amplified, with the TV signal channel 1 of 6 tunnel superfrequency lower sidebands modulation to channel 6 be input to the superfrequency high-isolation simultaneously, linear 6 road neighbours of height take place frequently and penetrate part.Superfrequency high-isolation, high linear 6 road neighbours take place frequently to penetrate partly three embodiments: broadband type scheme, high-power multiplex's synthetic schemes and audio frequency, video independence power amplifier scheme.
Fig. 3 is a broadband type scheme block diagram.Comprise cavity body filter, isolator, adjacent frequency domain channel blender, broadband cavity body filter and UHF power amplifier.6 road lower sidebands modulation UHF TV signal is respectively through each self-corresponding cavity body filter filtering, inputing to adjacent frequency domain channel blender with data channel after isolator is isolated mixes, the broadband rf signal of output is sent into the UHF power amplifier again and is amplified after the cavity body filter filtering of broadband, go out through omni-directional antenna transmission.This programme is suitable for level terrain and covers employing among a small circle.
Fig. 4 is high-power many merits synthetic schemes block diagram.Comprise one-level cavity body filter, UHF power amplifier, secondary chamber fluid filter, prime isolator, adjacent multiplex's synthesizer and final stage isolator frequently.6 road lower sidebands modulation UHF TV signal is amplified through each self-corresponding one-level cavity body filter filtering, UHF power amplifier successively, the filtering of secondary chamber fluid filter, the prime isolator is isolated the back and is obtained arrowband, high-power single channel UHF signal, multiplex's synthesizer is synthetic frequently through the neighbour with data channel for 6 road arrowbands high-power single channel UHF signal, and the high-power broadband signal of output is gone out by omni-directional antenna transmission after the final stage isolator is isolated.The every channel of this programme adopts a power amplifier link separately, and single channel power is bigger, and coverage rate is wider.
Fig. 5 is audio frequency, video independence power amplifier scheme block diagram.Comprise pix carrier power amplifier, sound carrier power amplifier, radio frequency duplexer and multiplex's synthesizer.Sound carrier A and image carrier V in every road lower sideband modulation UHF TV signal carry out the radio-frequency power amplification by being equipped with pix carrier power amplifier certainly and sound carrier power amplifier respectively, the power of image carrier V after the amplification is greater than the power of sound carrier A, make audio signal enough little to the interference of picture intelligence, synthetic through radio frequency duplexer again, form 6 tunnel high-power, high linear, high UHF TV signal every height.This 6 road UHF TV signal and data channel one surpass and enter multiplex's synthesizer, are gone out by omni-directional antenna transmission again.This programme transmission range is far away, and antijamming capability is strong, is applicable to large-scale covering.
Can not the overlay area for centraltransmitter, adopt and build the repeater mode and solve.
Fig. 6 is that 6 road uhf televisions are directly put the relay station composition frame chart.Comprise receiving paraboloid, prime cavity body filter, UHF power amplifier, final stage cavity body filter and corner antenna.The UHF multiple and super high frequency lower sideband modulated television signal that receiving paraboloid receives is with the outer filtering that suppresses by the prime cavity body filter, the UHF power amplifier amplifies, back level cavity body filter filtering is isolated, and is gone out by dihedral transmitting antenna directional transmissions, and area coverage obtains enlarging.Reception antenna adopts parabolic antenna, and than big corner antenna, the two adopted different polarization modes before and after transmitting antenna adopted, during installation in the horizontal direction with vertical direction stagger respectively 6 meters, more than 12 meters.
The user receives the controller composition frame chart as shown in Figure 7, it is by receiver, decode controller and V/A demodulation corrector are formed, TV signal that antenna is received and data channel signal are after receiver receives processing, decode controller is according to the instruction of data channel, makes V/A demodulation corrector work or stops.In V/A demodulation corrector when work,, lower sideband modulation UHF TV signal is inverted for upper sideband modulation UHF TV signal, and user's television set can normally be watched, otherwise user's television set is received is the signal of lower sideband modulation and can not show normal image.
Multiple and super high frequency TV transmission system of the present invention system, cheap, easy construction, unique user television reception machine controller cost is low, toll administration is convenient, installs simple and easyly, is good means that solve vast mountain area, the diffusing residential area multi-channel television paid service of rural area five equilibrium.
Claims (6)
1, multiple and super high frequency TV transmission system, comprise the adjacent front end 1 frequently of multiple and super high frequency, encoder 2, data-modulated amplifier 3, superfrequency high-isolation, high linear multi-path adjacent frequency radiating portion 4, the multiple and super high frequency TV directly puts relay station 5 and the user receives controller 6, it is characterized in that described superfrequency adopts 470～566MHZ, 606～798MHZ uhf television frequency range, and the adjacent front end frequently of multiple and super high frequency adopts a modulator that composite video signal is carried out the lower sideband modulation.
2, according to the multiple and super high frequency TV transmission system of claim 1, it is characterized in that described superfrequency high-isolation, high linear multi-path adjacent frequency radiating portion have three kinds of embodiments, be the broadband type scheme, high-power many merits synthetic schemes and audio frequency, video independence power amplifier scheme.
3,, it is characterized in that described broadband type scheme comprises cavity body filter, isolator, adjacent frequency domain channel blender, broadband cavity body filter and UHF power amplifier according to the multiple and super high frequency TV transmission system of claim 1 or 2.
4,, it is characterized in that described high-power many merits synthetic schemes comprises one-level cavity body filter, UHF power amplifier, secondary chamber fluid filter, prime isolator, adjacent multiplex's synthesizer and final stage isolator frequently according to the multiple and super high frequency TV transmission system of claim 1 or 2.
5,, it is characterized in that described audio frequency, video independence power amplifier scheme comprise pix carrier power amplifier, sound carrier power amplifier, radio frequency duplexer and multiplex's synthesizer according to the multiple and super high frequency TV transmission system of claim 1 or 2.
6, according to the multiple and super high frequency TV transmission system of claim 1, described user receives controller and comprises receiver, decode controller and V/A demodulation corrector, it is characterized in that the work or the halted state of described V/A demodulation corrector controlled by decode controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112454 CN1233917A (en) | 1998-04-30 | 1998-04-30 | Multiple and super high frequency TV transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112454 CN1233917A (en) | 1998-04-30 | 1998-04-30 | Multiple and super high frequency TV transmission system |
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| Publication Number | Publication Date |
|---|---|
| CN1233917A true CN1233917A (en) | 1999-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98112454 Pending CN1233917A (en) | 1998-04-30 | 1998-04-30 | Multiple and super high frequency TV transmission system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR1003965B (en) * | 2001-09-14 | 2002-08-06 | Χασαν Χιλμη Χατζημιλιαζημ | Trasnitter for receiving and emitting a wide spectrum fo television channels |
| CN100449945C (en) * | 2001-11-19 | 2009-01-07 | 因芬尼昂技术股份公司 | Linear PCM/PWM modulator |
| CN101147397B (en) * | 2004-09-17 | 2011-06-15 | 塔特公司 | Syetem and method for generating NTSC television broadcasting signal |
-
1998
- 1998-04-30 CN CN 98112454 patent/CN1233917A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR1003965B (en) * | 2001-09-14 | 2002-08-06 | Χασαν Χιλμη Χατζημιλιαζημ | Trasnitter for receiving and emitting a wide spectrum fo television channels |
| CN100449945C (en) * | 2001-11-19 | 2009-01-07 | 因芬尼昂技术股份公司 | Linear PCM/PWM modulator |
| CN101147397B (en) * | 2004-09-17 | 2011-06-15 | 塔特公司 | Syetem and method for generating NTSC television broadcasting signal |
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