CN1081306A - Satellite immediate frequency cable television network - Google Patents
Satellite immediate frequency cable television network Download PDFInfo
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- CN1081306A CN1081306A CN 92106620 CN92106620A CN1081306A CN 1081306 A CN1081306 A CN 1081306A CN 92106620 CN92106620 CN 92106620 CN 92106620 A CN92106620 A CN 92106620A CN 1081306 A CN1081306 A CN 1081306A
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Abstract
The present invention relates to a kind of satellite immediate frequency cable television network, with the distinctive points of existing cable TV be, transmit in the multiple-user network of TV programme at this coaxial cable, use on all four frequency band range of first intermediate-freuqncy signal and the mode of frequency regulation exported with satellite television receiving system first frequency converter (LNB) to carry out the transmission of signal.It is by intermediate frequency processor 1, intermediate frequency distribution network 2 and if demodulator 3 are formed, its advantage is, compatible fully with satellite television, both can directly transmit the satellite full frequency channel TV program, can utilize mode of frequency regulation that sound, vision signal are transmitted in satellite first Mid Frequency again and manage program and on-the-spot broadcasting program by oneself, the graphics/audio quality of transmission both can reach the broadcast level television standard, can make the user select the interior TV programme of satellite Mid Frequency arbitrarily again.
Description
The present invention relates to a kind of satellite immediate frequency cable television network, belong to microwave television signal wire transmission field.
At present, domestic and international traditional cable TV signal (CATV, MATV, SMATV) transmission technology, the frequency range of employing mostly is various countries' radio and television standard bands-45～860MHZ, adopts the amplitude modulation mode.Rule is, earlier satellite first intermediate-freuqncy signal of receiving is carried out down-conversion and power amplification, and demodulate baseband signal and sound, vision signal, and then this sound, vision signal (or video reproduction, the sound of live transmission, vision signal) be modulated into the radiofrequency signal that frequency is 45～860MHZ, be transferred to each user by common antenna and cable distribution network.Its weak point is: (1) program delivery quality is low, the actual picture signal of receiving of user, and its technical parameter does not reach technical standard more than 60%; (2) frequency range and the modulation system with satellite television can't be compatible, transmits satellite television programming and also can only be reduced to the radio and television frequency range, changes frequency modulation and be made as amplitude-modulation system; (3), frequency congestion low because of frequency range causes interference many, and as the ghost image interference of terrain and its features, electric spark disturbs, communication and radar chaff, and Harmonic Interference etc. when serious, almost can't be watched; (4) user can't choose at random each channel program of satellite; (5) can not satisfy the hope that numerous people is watched the high-quality satellite television.
The object of the present invention is to provide a kind of satellite immediate frequency cable television network (being called for short SINTV), carry out effective transmission of signal with on all four frequency band range of first intermediate-freuqncy signal and mode of frequency regulation with satellite television receiving system first frequency converter (LNB) output, can transmit and manage program and on-the-spot broadcasting program by oneself, also can be directly compatible with satellite television, under shared satellite earth antenna and tuner (LNB) situation, but the large tracts of land multi-user transmits the satellite full frequency channel TV program.
Technical solution of the present invention is, this satellite immediate frequency cable television network, its special character is, transmit in the multi-user networking of TV programme at coaxial cable, carry out the transmission of signal with on all four frequency band range of first intermediate-freuqncy signal and mode of frequency regulation with satellite television receiving system first frequency converter (LNB) output, it has intermediate frequency processor 1, will carry out multi-user's distribution from the intermediate-freuqncy signal of intermediate frequency processor 1 and carry out frequency conversion with the intermediate frequency distribution network 2 of transmission with to the intermediate-freuqncy signal from intermediate frequency distribution network 2, amplification also demodulates sound, the if demodulator 3 of vision signal.
The intermediate frequency processor 1 of this scheme has the sound of input, the baseband signal generator that vision signal synthesizes baseband signal, utilizes this baseband signal in a certain intermediate frequency channel-up intermediate frequency modulator frequently.
The output of this scheme intermediate frequency modulator has inserted a blender that the intermediate-freuqncy signal of exporting behind its frequency modulation is directly synthesized the output of one road signal together from the intermediate-freuqncy signal of satellite receiving system first frequency converter (LNB).
The intermediate frequency processor 1 of this scheme has the chopper that certain channel signals on the satellite is filtered, with the signal transformation of frequency domain channel on the satellite one or several to the empty channel of another satellite frequency shifter and the signal of chopper, frequency shifter output synthesized the blender of one road signal output.
Between the input of the output of this scheme chopper and blender, between another input of the output of frequency shifter and blender, line amplifier and attenuator have been sealed in respectively.
The intermediate frequency processor 1 of this scheme has from the attenuator of the signal weakening of a satellite receiving system first frequency converter (LNB) and will be from the signal of this attenuator and the blender that directly synthesizes the output of one road signal from the intermediate-freuqncy signal of another satellite receiving system first frequency converter (LNB).
The intermediate frequency processor 1 of this scheme is a line amplifier, and it will amplify and be transferred to intermediate frequency distribution network 2 from the intermediate-freuqncy signal of satellite receiving system first frequency converter (LNB).
In the intermediate frequency processor 1 of this scheme, inserted one again at the output of described modulator and output that two-way is synthesized No. one signal mixer through satellite first medium-frequency TV signal of cutting frequently, shift frequency is handled respectively two input signals have been synthesized the blender of one road signal output.
The baseband signal generator of this scheme intermediate frequency processor 1, intermediate frequency modulator respectively is three, three baseband signal generators compose in series three road signals with three intermediate frequency modulator respectively and export side by side, have inserted the blender that its input signal is synthesized the output of one road signal at the output of three road signals.
In this scheme intermediate frequency processor 1 the blender output of synthetic one road signal output of two-way satellite medium-frequency TV signal (wherein a tunnel through the attenuator balance that decays) is joined with inputs that three road signals by three baseband signal generators and three corresponding serial connection combinations of intermediate frequency modulator synthesized the blender that one road signal exports.
The intermediate frequency distribution network 2 of this scheme, having can be with broadband, low-loss transmits the coaxial cable of intermediate-freuqncy signal, one tunnel intermediate-freuqncy signal can be carried out multichannel distributes, make coaxial cable be the multistage power splitter of radiation profiles, being serially connected in can be to the frequency equalizer that the active linear amplifier of amplitude compensation is carried out in transmission and the power attenuation in the assigning process and serial connection can be carried out frequency characteristic compensation on coaxial cable on the coaxial cable.
The components and parts that may use in the intermediate frequency processor 1 are, the baseband signal generator, and it synthesizes baseband signal with the audio-video signal of input; Intermediate frequency modulator is carried out frequency modulation with baseband signal on the frequency domain channel in a certain; Blender can synthesize multichannel intermediate frequency input signal the output of one tunnel intermediate-freuqncy signal; Frequency shifter, the signal transformation of frequency domain channel in one or several can be become another one or several in the signal of frequency domain channels so that one tunnel output.Chopper can filter the signal of frequency domain channel in a certain; Attenuator makes certain road intermediate-freuqncy signal do suitably decay, so that adjust the balance of each road intermediate-freuqncy signal amplitude.Line amplifier is used for the raising of line signal level, to remedy the decay of signal in the cable transmission process.Select wherein part of devices according to different effects, or all adopt.Its combination can also be combined as other form except above-mentioned version about intermediate frequency processor.The simplest mode is that intermediate frequency processor 1 is a line amplifier, directly makes from the signal of satellite receiving system first frequency converter (LNB) through amplifying, and enters intermediate frequency distribution network 2 then.
The device that intermediate frequency distribution network 2 must be used is coaxial cable and power splitter.Line amplifier, the place of frequency equalizer and amplitude inequality big in power loss according to actual conditions is serially connected in the coaxial cable.Amplifier and frequency equalizer can use simultaneously, also can use respectively.The equipment of intermediate frequency distribution network is transmission frequency (frequency as 950～1450MHZ) in the first intermediate frequency frequency range that satellite receiving system first frequency converter (LNB) sends effectively.Line amplifier is mainly used in the raising of line signal level, to remedy the decay of signal in the cable transmission process, makes the signal level that arrives each user both reach requirement, and the carrier wave of transmission signals, noise ratio (c/n) are seriously degenerated.Equalizer, the difference that is used to proofread and correct height channel signals transmission attenuation.Because after each channel signals is spread out of by intermediate frequency processor 1, transmission by long distance, the amplitude difference of high channel signals and low channel signal is increasing, reach capacity after causing the few low channel signal amplitude of decay to be amplified, and the many high channel signal amplitudes of attenuation amplify after still below demodulator sensitivity, cause signal not transmit effectively.Equalizer is exactly the signal boost with high channel, and the Signal Compression of low channel is opposite fully with the frequency characteristic of cable transmission decay.Power splitter is that the intermediate-freuqncy signal that one road coaxial cable transmits is divided into multiple signals more than 2 tunnel equably.The requirement that the intermediate frequency distribution network is laid, generally be, guarantee each channel level reach-60～-30dbm, carrier-to-noise ratio is greater than the frequency discrimination threshold value (as greater than 8db) of if demodulator 3.
If demodulator 3 is to be assigned to user's intermediate-freuqncy signal through intermediate frequency distribution network 2, amplifies, frequency conversion, amplification again, demodulation, processing and output audio and vision signal (A/V), watches for user's television set.If demodulator 3 can be with general satellite receiver, as the Japanese TSR-C of Toshiba
4Receiver also can be developed special-purpose model.Some technical indicator of special-purpose model can suitably be relaxed reaching under the prerequisite of watching effect, so that reduce cost.
Because the present invention transmits in the multi-user networking of TV programme at coaxial cable, adopted on all four frequency band range of first intermediate-freuqncy signal and the mode of frequency regulation exported with satellite television receiving system first frequency converter (LNB) to carry out the transmission of signal, and it only has intermediate frequency processor 1, intermediate frequency distribution network 2, if demodulator 3 constitutes, so have simple in structure, compatible fully with satellite television, both can directly transmit the satellite full frequency channel TV program, can utilize the mode of frequency regulation identical to transmit again and manage program and on-the-spot broadcasting program by oneself with satellite frequency modulation, the image that transmits, audio quality can reach the broadcast level television standard, and can make the user select satellite television programming arbitrarily.
Accompanying drawing and drawing explanation:
Fig. 1-fundamental diagram of the present invention;
First kind of conceptual scheme of Fig. 2-intermediate frequency processor 1 of the present invention;
Second kind of conceptual scheme of Fig. 3-intermediate frequency processor 1 of the present invention;
The third conceptual scheme of Fig. 4-intermediate frequency processor 1 of the present invention;
The 4th kind of conceptual scheme of Fig. 5-intermediate frequency processor 1 of the present invention;
The 5th kind of conceptual scheme of Fig. 6-intermediate frequency processor 1 of the present invention;
The 6th kind of conceptual scheme of Fig. 7-intermediate frequency processor 1 of the present invention;
The 7th kind of conceptual scheme of Fig. 8-intermediate frequency processor 1 of the present invention;
The 8th kind of conceptual scheme of Fig. 9-intermediate frequency processor 1 of the present invention;
The 9th kind of conceptual scheme of Figure 10-intermediate frequency processor 1 of the present invention;
A kind of artwork of Figure 11-intermediate frequency distribution network 2 of the present invention;
Figure 12-parallel network switch is selected schematic diagram.
Wherein: 1-intermediate frequency processor, 2-intermediate frequency distribution network, 3-if demodulator (SR
1, SR
2SR
16), 4, the 5-satellite earth antenna, 6,7-low noise amplification frequency converter, 8,9-player, the 31-video camera, 10, the 17-power splitter, 11,27, the 29-intermediate frequency modulator, the 12-chopper, the 13-frequency shifter, 14, the 30-blender, the 15-attenuator, 16,26,28-baseband signal generator, 18-television set (TV
1, TV
2TV
16), 21,32,33, the 35-line amplifier, 22, the 23-intermediate frequency processor, 24,25-intermediate frequency distribution network, the 34-frequency equalizer.
The invention will be further described below in conjunction with accompanying drawing.With reference to figure 2～Figure 12.
Fig. 2, baseband signal generator 16 synthesizes sound, the vision signal of input one roadbed band signal and delivers to intermediate frequency modulator 11, and this baseband signal of intermediate frequency modulator 11 usefulness is carried out frequency modulation on the frequency domain channel in a certain, exports with the intermediate-freuqncy signal of a channel then,
Fig. 3 is will deliver to blender 14 inputs simultaneously by the intermediate-freuqncy signal of intermediate frequency modulator 11 together from (LNB) intermediate-freuqncy signal of satellite receiving system first frequency converter on the basis of Fig. 2, and by one tunnel output.
Fig. 4, it is with the multichannel medium-frequency TV signal from first satellite receiving system first frequency converter (LNB), filter a certain signal that does not transmit channel earlier with chopper 12 and be input to blender 14 again, intermediate-freuqncy signal (as 7,9 channels) from second satellite receiving system first frequency converter (LNB), upconvert on the empty channel of first satellite and be input to blender 14 after (as 21,23 channels), two paths of signals is combined into the output of one road signal by blender 14.
Fig. 5, it is to a kind of improvement of Fig. 4 and perfect.Intermediate-freuqncy signal from first satellite, the signal that filters certain channel earlier is amplified into blender 14 through line amplifier 21 again, intermediate-freuqncy signal from second satellite is passed through the frequency shifter frequency conversion, again through attenuator 15 decay, make the signal amplitude identical (or basically identical) on this road signal amplitude and another road, enter blender 14 then, at last by blender 14 outputs.
Fig. 6, it is with the intermediate-freuqncy signal of two-way from satellite receiving system first frequency converter (LNB), by 14 synthetic one tunnel outputs of a blender.Wherein one road signal is through attenuator 15 decay, makes the two paths of signals amplitude unanimity that enters before the blender 14.
Fig. 7, it is with the intermediate-freuqncy signal output after line amplifier 21 amplifies from one tunnel satellite receiving system, first frequency converter (LNB).
Fig. 8, it at first mixes output from the intermediate-freuqncy signal of satellite receiving system first frequency converter (LNB) through blender 14 with two-way, and (first via has been passed through filtering and processing and amplifying, the second the tunnel has passed through shift frequency and attenuation processing), and then will be from the output signal of blender 14, with audio-video signal process baseband signal generator 16, it is that the signal of a certain channel is mixed into one tunnel output in the satellite intermediate frequency frequency range that intermediate frequency modulator 11 is handled frequency modulation together.
Fig. 9, it be with three road sounds, vision signal respectively through baseband signal generator 16,26,28, intermediate frequency modulator 11,27,29 is handled, frequency modulation is the radiofrequency signal of three channels in satellite first Mid Frequency, then by blender 30 with its synthetic one tunnel output.
Figure 10, it is to synthesize one road signal (wherein the amplitude of input signal has been adjusted in 15 decay of one tunnel process attenuator) output earlier from the intermediate-freuqncy signal of two satellite receiving system first frequency converters (LNB), this output signal and three road sounds, vision signal are respectively through baseband signal generator 16,26,28, and intermediate frequency modulator 11,27,29 frequency modulation are that the radiofrequency signal of three channels in satellite first Mid Frequency is combined into the output of one road signal through blender 30.
The intermediate frequency processor 1 of Fig. 2～shown in Figure 9 and intermediate frequency distribution network 2, if demodulator 3 shown in Figure 11 can form 2,3,4,5,6,7,8,9 totally eight kinds of satellite immediate frequency cable television network schemes.
The laying mode of intermediate frequency distribution network 2 also can have various laying modes except that shown in Figure 11, decide according to actual conditions.In Figure 10, very concentrated if live in 16 families, the line amplifier in first transmission line then, frequency equalizer, the line amplifier in the 16 transmission line can omit.
Below scheme 5 is done more detailed explanation.With reference to figure 5, Figure 11.This is two satellite television programmings of a reception, and only with an example that distributes the networking.Two satellites can be same band satellite (C+C or Ku+Ku wave bands), also can be different-waveband satellites (C+Ku), and reason is though that the wave band difference of two satellites, first intermediate frequency is identical.The signal that the antenna of two satellites of reception is received through after the amplification frequency converter amplification frequency conversion, is exported the first intermediate-freuqncy signal IF respectively
1, IF
2If IF
1The physical program that comprises is CH3,5,7,9,11,13,17,21 totally eight channels, supposes that again CH9 does not transmit.IF
2In comprise CH7,11 two channels.Principle is: chopper 12 is band stop filters of a standard C H9 channel, 9 channel signals can be filtered, keep CH3,5,7,11,13,17,21 7 channels, the signal of these seven channels is amplified into an input of blender 14 through line amplifier 35.IF
2In CH7,11 two channel signals on frequency shifter 13, move 12 channels, become two new channels of CH19, CH23, the signal of these two channels is done suitably decay through attenuator 15 to be made and other signal CH3,5,7,11,13, the 21 amplitude basically identicals of seven channels on the way, enter another input of blender 14, two paths of signals is sent in intermediate frequency distribution network 2 and the if demodulator 3 by the coaxial cable of 75 Ω through blender 14 synthetic one road signals again.The transmission course of back is identical with scheme 1, outlines here.
When number of satellite is a lot, when number of programs is also a lot, can adopt the use in parallel of two or more satellite immediate frequency cable television networks.Several immediate frequency cables 11 that at this moment only need will enter the user are received the input of K switch, as shown in figure 12.The user selects the different programs of different IF net by K switch.The polarization switch of U.S. STS company is exactly the coaxial type multidiameter option switch of a kind of 950～1450MHZ.
The antenna of using among the embodiment 4,5 is the one-time formed aluminium sheet parabolic antenna of 2.2 meters precisions of φ.If demodulator is the TSR-C of Toshiba
4Product.Line amplifier, power divider, channel chopper, frequency shifter, frequency equalizer etc. all are 950～1450MHZ dedicated devices.Transmission cable is SYKV-75-5,75-7,75-9 coaxial cable.
Claims (11)
1, a kind of satellite immediate frequency cable television network, it is characterized in that transmitting in the multi-user networking of TV programme at coaxial cable, carry out the transmission of signal with on all four frequency band range of first intermediate-freuqncy signal and mode of frequency regulation with satellite television receiving system first frequency converter (LNB) output, it has intermediate frequency processor 1, will carry out the multi-user from the intermediate-freuqncy signal of intermediate frequency processor 1 and distribute with the intermediate frequency distribution network 2 of transmission with to carry out frequency conversion, amplify and demodulate the if demodulator 3 of sound, vision signal from the intermediate-freuqncy signal of intermediate frequency distribution network 2.
2, by the described satellite immediate frequency cable of claim 1 television network, it is characterized in that, described intermediate frequency processor 1 has the sound of input, the baseband signal generator that vision signal synthesizes baseband signal, utilizes this baseband signal in a certain intermediate frequency channel-up intermediate frequency modulator frequently.
3, by the described satellite immediate frequency cable of claim 2 television network, it is characterized in that, inserted an intermediate-freuqncy signal of exporting after with its frequency modulation with the blender that directly synthesizes the output of one road signal from the intermediate-freuqncy signal of satellite receiving system first frequency converter (LNB) at the output of described intermediate frequency modulator.
4, by the described satellite immediate frequency cable of claim 1 television network, it is characterized in that, described intermediate frequency processor 1 has the chopper that certain channel signals on the satellite is filtered, with the signal transformation of frequency domain channel on the satellite one or several frequency shifter to the empty channel of another satellite, with with chopper, the signal of frequency shifter output synthesizes the blender of one road signal output.
5,, it is characterized in that between the output of described chopper and an input that mixes, between another input of the output of frequency shifter and blender, having sealed in line amplifier and attenuator respectively by the described satellite immediate frequency cable of claim 4 television network.
6, by the described satellite immediate frequency cable of claim 1 television network, it is characterized in that, described intermediate frequency processor 1 has from the attenuator of the signal weakening of satellite receiving system first frequency converter (LNB) and will be from the signal of this attenuator and the blender that directly synthesizes the output of one road signal from the intermediate-freuqncy signal of another satellite receiving system first frequency converter (LNB).
7, by the described satellite immediate frequency cable of claim 1 television network, it is characterized in that described intermediate frequency processor 1 is line amplifier, it will amplify and be transferred to intermediate frequency distribution network 2 from the intermediate-freuqncy signal of satellite receiving system first frequency converter (LNB).
8, by claim 2 and 5 described satellite immediate frequency cable television networks, it is characterized in that, inserted one again at the output of the output of described intermediate frequency processor 1 internal intermediate frequency modulator and blender its input signal synthesized the blender of one road signal output.
9, by the described satellite immediate frequency cable of claim 2 television network, it is characterized in that, described baseband signal generator, intermediate frequency modulator is three, three baseband signal generators compose in series three road signals with three intermediate frequency modulator respectively and export side by side, and by synthetic one road signal output of set blender.
10,, it is characterized in that two-way satellite medium-frequency TV signal is synthesized the blender output of one road signal output to join with inputs that three road signals by three baseband signal generators and three corresponding serial connection combinations of intermediate frequency modulator synthesized the blender of one road signal output by claim 6 and 9 described satellite immediate frequency cable television networks.
11, by claim 2,3,4,5,6,7,8,9,10 described satellite immediate frequency cable television networks, it is characterized in that, described intermediate frequency distribution network 2, has the coaxial cable that can transmit intermediate-freuqncy signal with broadband, end loss, one tunnel intermediate-freuqncy signal can be carried out multichannel distributes, make coaxial cable be the multistage power splitter of radiation profiles, be serially connected on the coaxial cable and can carry out the active line amplifier of amplitude compensation and on coaxial cable, be connected in series the frequency equalizer that can carry out frequency characteristic compensation transmission and the power attenuation in the assigning process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92106620 CN1030814C (en) | 1992-07-16 | 1992-07-16 | Satellite intermediate-frequency cable television network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92106620 CN1030814C (en) | 1992-07-16 | 1992-07-16 | Satellite intermediate-frequency cable television network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1081306A true CN1081306A (en) | 1994-01-26 |
| CN1030814C CN1030814C (en) | 1996-01-24 |
Family
ID=4942276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92106620 Expired - Fee Related CN1030814C (en) | 1992-07-16 | 1992-07-16 | Satellite intermediate-frequency cable television network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1030814C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8449749B2 (en) | 2008-03-07 | 2013-05-28 | Lg Electronics Inc. | In-water discharging apparatus |
| CN105204397A (en) * | 2015-09-15 | 2015-12-30 | 成都创新达微波电子有限公司 | Large-scale switch matrix |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8712318B2 (en) * | 2007-05-29 | 2014-04-29 | The Directv Group, Inc. | Integrated multi-sat LNB and frequency translation module |
-
1992
- 1992-07-16 CN CN 92106620 patent/CN1030814C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8449749B2 (en) | 2008-03-07 | 2013-05-28 | Lg Electronics Inc. | In-water discharging apparatus |
| US8544825B2 (en) | 2008-03-07 | 2013-10-01 | Lg Electronics Inc. | Humidifier |
| US8813517B2 (en) | 2008-03-07 | 2014-08-26 | Lg Electronics Inc. | Air conditioner and air conditioning system |
| CN105204397A (en) * | 2015-09-15 | 2015-12-30 | 成都创新达微波电子有限公司 | Large-scale switch matrix |
| 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 |
| CN106101665B (en) * | 2016-08-05 | 2022-04-19 | 北京华信泰科技股份有限公司 | Satellite signal processor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1030814C (en) | 1996-01-24 |
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