CN101931794A - Band switching circuit and relative satellite television system thereof - Google Patents
Band switching circuit and relative satellite television system thereof Download PDFInfo
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- CN101931794A CN101931794A CN2009101486266A CN200910148626A CN101931794A CN 101931794 A CN101931794 A CN 101931794A CN 2009101486266 A CN2009101486266 A CN 2009101486266A CN 200910148626 A CN200910148626 A CN 200910148626A CN 101931794 A CN101931794 A CN 101931794A
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Abstract
The invention relates to a band switching circuit and a relative satellite television system thereof, particularly, the band switching circuit comprises a band-pass filter, a band rejection filter, a first power divider, a local oscillator, a mixer, a switching circuit, a high-pass filter, a second power divider and a low-pass filter. The band-pass filter and the band rejection filter respectively filter an input signal with reduced frequency to generate a first filtered signal and a second filtered signal; the first power divider is coupled with the band rejection filter; the mixer is coupled with the first power divider and the local oscillator; the switching circuit is coupled with the first power divider and the mixer; the high-pass filter is coupled with the switching circuit; the second power divider is coupled with the band-pass filter and the high-pass filter; and the low-pass filer is coupled with the second power divider. The invention can simplify a circuit, reduce the overall size of a product, save the cost, lessen the transmission loss of signals, improve the signal quality of products, also can be produced on a production line in quantity so as to improve the yield of the product.
Description
Technical field
The present invention relates to about band switching circuit and relative satellite television system thereof, relate in particular to a kind of band switching circuit and relative satellite television system thereof that promotes signal quality and manufacturing yield of products.
Background technology
Satellite communication system has the characteristic of broadband and large coverage, is widely used in fields such as detection, military affairs, communication network, data and mobile communication.For the terrestrial user of satellite communication system, must possess antenna, satellite frequency demultiplier (Low-noise Block Down-converter, LNB) and demodulator, could receiving satellite signal.Satellite-signal is an intermediate-freuqncy signal through the satellite frequency demultiplier frequency reducing after being received by antenna, produces play signal by the demodulator demodulation at last, exports user's set to, as TV.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram of a reduced frequency satellite-signal 100 on frequency spectrum, and Fig. 2 then is that reduced frequency satellite-signal 100 shown in Figure 1 is handled schematic diagram later through a band switching circuit 200.As shown in Figure 1, reduced frequency input signal 100 comprises the one first data-signal DS1 that is positioned at one first frequency range FB1, one the 3rd data-signal DS3 that is positioned at the one second data-signal FB2 of one second frequency range FB2 and is positioned at one the 3rd frequency range FB3, wherein the 3rd frequency range FB3 is higher than the second frequency range FB2, and the second frequency range FB2 is higher than the first frequency range FB1.
Because present receiver (for example narrow frequency receiver 240) can only receive the data-signal of the second frequency range FB2 and the 3rd frequency range FB3, and can't receive the first data-signal DS1 that is positioned at the first frequency range FB1, therefore must add a band switching circuit 200, the then whole data-signal of sectional selective reception at the input of narrow frequency receiver 240.As shown in Figure 2, control by a selection signal SEL1, band switching circuit 200 can select to export first output signal 210 or second output signal 220 is given narrow frequency receiver 240, wherein first output signal 210 comprises second data-signal DS2 that is positioned at the second frequency range FB2 and the 3rd data-signal DS3 that is positioned at the 3rd frequency range FB3, and second output signal 220 then comprises second data-signal DS2 that is positioned at the second frequency range FB2 and the first data-signal DS1 that is positioned at the 3rd frequency range FB3 (through after the raising frequency).
Please refer to Fig. 3, Fig. 3 is the structural representation of known B band switching circuit 300.As shown in Figure 3, B band switching circuit 300 includes one first power divider 310, one first high pass filter HPF1, one second power divider 320, a band pass filter BPF1, a low pass filter LPF1, a mixer 330, a local oscillator 340, one second high pass filter HPF2, one the 3rd power divider 350, switching circuit 360, a microcontroller 370 and one second a low pass filter LPF2.Can learn by Fig. 3, B band switching circuit 300 receives reduced frequency satellite-signal 100 shown in Figure 1, and after the processing through inner each assembly, can select to export the narrow frequency receiver (figure does not show) that first output signal 210 or second output signal 220 are given the rear end by commutation circuit 360.
B band switching circuit 300 shown in Figure 3 is existing products on the market at present, but the circuit structure of realizing is comparatively complicated.Therefore, how to promote signal quality, simplify circuit and save cost, promptly become one of the important topic in the design field.
Summary of the invention
Therefore, one of purpose of the present invention is to propose a kind of band switching circuit and relative satellite television system thereof, to address the above problem.
The present invention discloses a kind of band switching circuit, in order to receive a reduced frequency input signal, this reduced frequency input signal comprises one first data-signal that is positioned at one first frequency range, one the 3rd data-signal that is positioned at one second data-signal of one second frequency range and is positioned at one the 3rd frequency range, and the 3rd frequency range greater than this second frequency range and this second frequency range greater than this first frequency range.This band switching circuit comprises a band pass filter, a band stop filter, one first power divider, a local oscillator, a frequency mixer, a switching circuit, a high pass filter, one second power divider and a low pass filter.This band pass filter is carried out a bandpass filtering and is moved on this reduced frequency input signal, filters the back signal to produce one first, and wherein this first filtration back signal comprises this second data-signal that is positioned at this second frequency range.This band stop filter is carried out a bandreject filtering and is moved on this reduced frequency input signal, filter the back signal to produce one second, wherein this second filtration back signal comprises this first data-signal that is positioned at this first frequency range and the 3rd data-signal that is positioned at the 3rd frequency range.This first power divider is coupled to this band stop filter, is used for producing one first separation signal and one second separation signal according to this second filtration back signal.This local oscillator provides a local oscillated signal.This frequency mixer is coupled to this first power divider and this local oscillator, is used for adjusting according to this local oscillated signal the frequency of this second separation signal, to produce raising frequency second separation signal.This commutation circuit is coupled to this first power divider and this frequency mixer, is used for to select one raising frequency second separation signal from this first separation signal and this according to a selection signal, and exports an output signal.This high pass filter is coupled to this commutation circuit, is used for carrying out a high-pass filtering and moves on this output signal, filters the back signal to produce one the 3rd.This second power divider is coupled to this band pass filter and this high pass filter, is used for merging this first filtration back signal and the 3rd and filters the back signal, to produce a combined signal.This low pass filter coupled is used for carrying out a low-pass filtering and moves on this combined signal in this second power divider, filters the back signal to produce one the 4th.
The present invention also discloses a kind of band switching circuit, in order to receive a reduced frequency input signal, this reduced frequency input signal comprises one first data-signal that is positioned at one first frequency range, one the 3rd data-signal that is positioned at one second data-signal of one second frequency range and is positioned at one the 3rd frequency range, and the 3rd frequency range greater than this second frequency range and this second frequency range greater than this first frequency range.This band switching circuit comprises a band pass filter, a band stop filter, one first power divider, a local oscillator, a frequency mixer, switching circuit, a high pass filter and one second power divider.This band pass filter is carried out a bandpass filtering and is moved on this reduced frequency input signal, filters the back signal to produce one first, and wherein this first filtration back signal comprises this second data-signal that is positioned at this second frequency range.This band stop filter is carried out a bandreject filtering and is moved on this reduced frequency input signal, filter the back signal to produce one second, wherein this second filtration back signal comprises this first data-signal that is positioned at this first frequency range and the 3rd data-signal that is positioned at the 3rd frequency range.This first power divider is coupled to this band stop filter, is used for producing one first separation signal and one second separation signal according to this second filtration back signal.This local oscillator provides a local oscillated signal.This frequency mixer is coupled to this first power divider and this local oscillator, is used for adjusting according to this local oscillated signal the frequency of this second separation signal, to produce raising frequency second separation signal.This commutation circuit is coupled to this first power divider and this frequency mixer, is used for to select one raising frequency second separation signal from this first separation signal and this according to a selection signal, and exports an output signal.This high pass filter is coupled to this commutation circuit, is used for carrying out a high-pass filtering and moves on this output signal, filters the back signal to produce one the 3rd.This second power divider is coupled to this band pass filter and this high pass filter, is used for merging this first filtration back signal and the 3rd and filters the back signal, to produce a combined signal.Wherein this band switching circuit is a B band switching circuit.
The present invention also discloses a kind of satellite TV system.This satellite TV system comprises a lnb, a band switching circuit and a satellite Integrated Receive Decoder.This lnb receives a satellite-signal, and carry out frequency reducing and amplify to produce a reduced frequency satellite-signal, this reduced frequency satellite-signal comprises one first data-signal that is positioned at one first frequency range, one the 3rd data-signal that is positioned at one second data-signal of one second frequency range and is positioned at one the 3rd frequency range, and the 3rd frequency range greater than this second frequency range and this second frequency range greater than this first frequency range.This band switching circuit is coupled to this lnb, in order to receive this reduced frequency satellite-signal.This band switching circuit includes a band pass filter, a band stop filter, one first power divider, a local oscillator, a frequency mixer, a switching circuit, a high pass filter, one second power divider and a low pass filter.This band pass filter is carried out a bandpass filtering and is moved on this reduced frequency input signal, filters the back signal to produce one first, and wherein this first filtration back signal comprises this second data-signal that is positioned at this second frequency range.This band stop filter is carried out a bandreject filtering and is moved on this reduced frequency input signal, filter the back signal to produce one second, wherein this second filtration back signal comprises this first data-signal that is positioned at this first frequency range and the 3rd data-signal that is positioned at the 3rd frequency range.This first power divider is coupled to this band stop filter, is used for producing one first separation signal and one second separation signal according to this second filtration back signal.This local oscillator provides a local oscillated signal.This frequency mixer is coupled to this first power divider and this local oscillator, is used for adjusting according to this local oscillated signal the frequency of this second separation signal, to produce raising frequency second separation signal.This commutation circuit is coupled to this first power divider and this frequency mixer, is used for to select one raising frequency second separation signal from this first separation signal and this according to a selection signal, and exports an output signal.This high pass filter is coupled to this commutation circuit, is used for carrying out a high-pass filtering and moves on this output signal, filters the back signal to produce one the 3rd.This second power divider is coupled to this band pass filter and this high pass filter, is used for merging this first filtration back signal and the 3rd and filters the back signal, to produce a combined signal.This low pass filter coupled is used for carrying out a low-pass filtering and moves on this combined signal in this second power divider, filters the back signal to produce one the 4th.This satellite Integrated Receive Decoder is coupled to this band switching circuit, in order to receive the 4th filtration back signal and to decode.
Band switching circuit involved in the present invention can be simplified circuit (for example reducing the number of power divider, filter), and then dwindles the overall dimensions of product and save cost.And because the component count of band switching circuit is less, can reduce the transmission consume of signal, with so that promote the signal quality of product.In addition, can be on same integrated circuit, and direct this integrated circuit of volume production on production line with components such as power divider, frequency mixer, local oscillator, commutation circuit and microcontrollers, and then improve the fine ratio of product of product.
Description of drawings
Fig. 1 is the schematic diagram of a reduced frequency satellite-signal on frequency spectrum.
Fig. 2 is that reduced frequency satellite-signal shown in Figure 1 is handled schematic diagram later through a band switching circuit.
Fig. 3 is the structural representation of known B band switching circuit.
Fig. 4 is the structural representation of an embodiment of band switching circuit of the present invention.
Fig. 5 is the schematic diagram of each signal on frequency spectrum shown in Figure 4.
Fig. 6 is the schematic diagram of first embodiment of satellite TV system of the present invention.
Fig. 7 is the schematic diagram of second embodiment of satellite TV system of the present invention.
The primary clustering symbol description:
100 reduced frequency satellite-signal SS2, second separation signal
The DS1 first data-signal SS22 is raising frequency second separation signal
The DS2 second data-signal LOS1 local oscillated signal
DS3 the 3rd data-signal fo frequency of oscillation
The FB1 first frequency range S
OUTOutput signal
The FB2 second frequency range SEL1, SEL11 select signal
FB3 the 3rd frequency range V1 power supply
240 narrow frequency receiver FS3 the 3rd filter the back signal
300B band switching circuit CS1 combined signal
200,400,620 band switching circuit FS4 the 4th filter the back signal
BPF1, BPF11 band pass filter 210 first output signals
BSF11 band stop filter 220 second output signals
HPF1, HPF2, HPF11 high pass filter 600,700 satellite TV systems
LPF1, LPF2, LPF11 low pass filter 610 lnbs
310,320,350,410,450 power dividers, 630 satellite Integrated Receive Decoders
330,430 frequency mixers, 640 cables
340,440 local oscillators, 720 variable connector devices
360,460 commutation circuit 720A input ports
370,470 microcontroller 720B output ports
FS1 first filters back signal IM1, IM2 signal of video signal
FS2 second filters back signal CS2 and merges back reduced frequency satellite-signal
SS1 first separation signal
Embodiment
Please refer to Fig. 4, Fig. 4 is the structural representation of an embodiment of band switching circuit 400 of the present invention.As shown in Figure 4, band switching circuit 400 includes (but being not limited to) band pass filter BPF11, a band stop filter (band-stopfilter) BSF11, one first power divider 410, a frequency mixer 430, a local oscillator 440, a switching circuit 460, a microcontroller 470, a high pass filter HPF11, one second power divider 450 and a low pass filter LPF11.Band switching circuit 400 is used for receiving a reduced frequency input signal, reduced frequency satellite-signal 100 as shown in Figure 1.In the present embodiment, the first frequency range FB1 drops on 250～750MHz, and the second frequency range FB2 drops on 950～1450MHz, and the 3rd frequency range FB3 drops on 1650～2150MHz, but the present invention is not limited thereto.Note that band switching circuit 400 can be applicable in the satellite TV system, but the present invention is not limited thereto, also can be applicable in other products.
Please in the lump with reference to figure 5, Fig. 5 is the schematic diagram of each signal on frequency spectrum shown in Figure 4.At first, utilizing band pass filter BPF11 and band stop filter BSF11 to carry out a filtering respectively moves on reduced frequency satellite-signal 100, filter back signal FS1 and one second filtration back signal FS2 to produce one first respectively, wherein the first filtration back signal FS1 comprises the second data-signal DS2 that is positioned at the second frequency range FB2, and second filters back signal FS2 then comprises first data-signal DS1 that is positioned at the first frequency range FB1 and the 3rd data-signal DS3 that is positioned at the 3rd frequency range FB3.First power divider 410 is coupled to band stop filter BSF11, filter back signal FS2 according to second and produce one first separation signal SS1 and one second separation signal SS2, wherein the signal component of the first separation signal SS1 and the second separation signal SS2 and the distributing position on frequency spectrum are all identical with the second filtration back signal FS2, and only both power all comes for a short time than second power that filters back signal FS2.
Then, local oscillator 440 provides a local oscillated signal LOS1 to frequency mixer 430, and 430 in frequency mixer is adjusted the frequency of the second separation signal SS2 according to local oscillated signal LOS1, to produce raising frequency second a separation signal SS22.In present embodiment, the frequency of oscillation fo of local oscillated signal LOS1 is to be example with 2400MHz, but this is not a restrictive condition of the present invention.Therefore, after frequency mixer 430 carries out smear with local oscillated signal LOS1 and the second separation signal SS2, can be by original frequency (for example with the second separation signal SS2, the centre frequency of the second separation signal SS2 is fs) be promoted to frequency (fo+fs), and locate to produce the mirror signal of the second separation signal SS2 in frequency (fo-fs), shown in the second separation signal SS22 of raising frequency of Fig. 5.In other words, frequency mixer 430 herein is originally to be positioned at the first data-signal DS1 raising frequency to the, the three frequency range FB3 of the first frequency range FB1.Then, commutation circuit 460 is coupled to first power divider 410 and frequency mixer 430, is used for selecting signal SEL11 to come from the first separation signal SS1 and having selected one of them the raising frequency second separation signal SS22 according to one, and exports an output signal S
OUT
In addition, microcontroller 470 is coupled to commutation circuit 460 and local oscillator 440, is used to provide to select signal SEL11 how to carry out the signal switching with control commutation circuit 460, and provides a power supply V1 to local oscillator 440.The raising frequency second separation signal SS22 is used as output signal S when commutation circuit 460 selects to export
OUTThe time, this moment, microcontroller must provide power supply V1 to make it can normal operation to local oscillator 440 simultaneously; Be used as output signal S and select the output first separation signal SS1 when commutation circuit 460
OUTThe time, this moment, microcontroller 470 can cut out the power consumption that power supply V1 saves local oscillator 440.And high pass filter HPF11 is coupled to commutation circuit 460, is used for carrying out a high-pass filtering and moves in output signal S
OUTOn (that is the first separation signal SS1 or the raising frequency second separation signal SS22), filter back signal FS3 to produce one the 3rd.That is to say that the signal that high pass filter HPF11 only allows to be higher than the 3rd frequency range FB3 passes through, filter shown in the signal FS3 of back as the 3rd of Fig. 5.
Afterwards, second power divider 450 is coupled to band pass filter BPF11 and high pass filter HPF11, is used for merging first and filters back signal FS1 and the 3rd filtration back signal FS3, to produce a combined signal CS1.At last, low pass filter LPF11 is coupled to second power divider 450, is used for carrying out a low-pass filtering and moves on combined signal CS1, filters back signal FS4 to produce one the 4th.Because low pass filter LPF11 only allows to comprise the first frequency range FB1, the second frequency range FB2 and the following signal of the 3rd frequency range FB3 passes through, the target signal filter that is higher than the 3rd frequency range FB3 that mixer 430 can be produced filters shown in the signal FS4 of back as the 4th of Fig. 5.That is to say, the 4th filters the 3rd data-signal DS3 (that is first output signal 210) that back signal FS4 comprises the second data-signal DS2 that is positioned at the second frequency range FB2 and is positioned at the 3rd frequency range FB3, the first data-signal DS1 (that is second output signal 220) that perhaps comprises the second data-signal DS2 that is positioned at the second frequency range FB2 and be positioned at the 3rd frequency range FB3.
In brief, band switching circuit 400 is to receive reduced frequency satellite-signal 100 shown in Figure 1, and after the processing through inner each assembly, can select to export the narrow frequency receiver (figure does not show) that first output signal 210 or second output signal 220 are given the rear end by commutation circuit 460.
Please note, in present embodiment, low pass filter LPF11 is arranged among the band switching circuit 400, if having possessed, the narrow frequency receiver of rear end only allows to comprise low pass filter or the band pass filter that the signal below the first frequency range FB1, the second frequency range FB2 and the 3rd frequency range FB3 passes through, then low pass filter LPF11 is inessential assembly (optionalelement), also can omit or is replaced by other assemblies that can reach identical purpose.Then band switching circuit 400 can be a B band switching circuit (B-band converter), but this is not a restrictive condition of the present invention.Notice again that please in other embodiment, select signal SEL11 also can be provided (for example the user does selection by remote controller) by the user, then microcontroller 470 also is inessential assembly.
It should be noted that owing to the occupied area of the assemblies such as first power divider 410, frequency mixer 430, local oscillator 440, commutation circuit 460 and microcontroller 470 in the present embodiment is little, therefore can be practiced in easily on the same integrated circuit.Thus, the fine ratio of product of directly this integrated circuit of volume production on production line, and then raising product.
The disclosed band switching circuit 400 of present embodiment possesses following advantage: the purpose that circuit is simplified, cost is lower, can promote the signal quality of product and reach product modular (chipization).Band switching circuit 400 uses four filters and two power dividers.Thus, can reach the size and the cost-effective purpose of dwindling product.And because the component count of band switching circuit 400 is less, can reduce the transmission consume of signal, and and then promote the signal quality of product.In addition, band switching circuit 400 can be with components such as first power divider 410, frequency mixer 430, local oscillator 440, commutation circuit 460 and microcontrollers 470 on same integrated circuit, and direct this integrated circuit of volume production on production line, and then improve the fine ratio of product of product.
Generally speaking, a B band switching circuit and a lnb (low-noise block down-converter, LNB) and a satellite Integrated Receive Decoder (Integrated Receiver-Decoder, IRD) collocation is used.Wherein, the output signal of lnb includes: drop on the Ka Lo-band signal (also being referred to as B wave band (BBand) signal) of 250～750MHz, the Ka Hi-band signal (also being referred to as A band (A band) signal) that drops on the Ku band signal of 950～1450MHz and drop on 1650～2150MHz.The incoming frequency scope of satellite Integrated Receive Decoder then only comprises 950～2150MHz, therefore must be first Ka Lo-band signal be carried out raising frequency (by 250～750MHz raising frequency to 1650～2150MHz) afterwards, can receive Ka Lo-band signal by the B band switching circuit.
Please refer to Fig. 6, Fig. 6 is the schematic diagram of first embodiment of satellite TV system 600 of the present invention.As shown in Figure 6, satellite TV system 600 includes a lnb 610, a band switching circuit 620 and a satellite Integrated Receive Decoder 630.Lnb 610 receives a satellite-signal, and carries out frequency reducing and amplify to produce a reduced frequency satellite-signal, reduced frequency satellite-signal 100 as shown in Figure 1.Band switching circuit 620 is coupled to lnb 610 by a cable 640, in order to receiving this reduced frequency satellite-signal, and band switching circuit 620 can be realized by band switching circuit shown in Figure 4 400 (the perhaps alternate embodiment of band switching circuit 400).And satellite Integrated Receive Decoder 630 is coupled to band switching circuit 620, the signal of being exported in order to receiving wave range change-over circuit 620 (for example the 4th filtering back signal FS4) is also decoded, and satellite Integrated Receive Decoder 630 herein is aforementioned mentioned narrow frequency receiver.
Please refer to Fig. 7, Fig. 7 is the schematic diagram of second embodiment of satellite TV system 700 of the present invention.The structure of the satellite TV system 700 of Fig. 7 and the satellite TV system 600 of Fig. 6 are similar, and both differences are that satellite TV system 700 also comprises a variable connector device (multi-switch) 720 and is coupled between lnb 610 and the band switching circuit 620.Variable connector device 720 has a plurality of input port 720A and a plurality of output port 720B, wherein a plurality of input port 720A are used for receiving this reduced frequency satellite-signal and a plurality of signal of video signal (for example IM1, IM2) and merge to produce one and merge back reduced frequency satellite-signal (for example CS2), and one of them of a plurality of output port 720B then will merge back reduced frequency satellite-signal CS2 and distribute to band switching circuit 620.In other words, this merging back reduced frequency satellite-signal CS2 can be distributed to several users simultaneously by variable connector device 720 uses for it.
Above-described embodiment only is used for technical characterictic of the present invention is described, is not to be used for limiting to category of the present invention.As from the foregoing, the invention provides a kind of band switching circuit and relative satellite television system thereof.Band switching circuit can be simplified circuit (for example reducing the number of power divider, filter), and then dwindles the overall dimensions of product and save cost.And because the component count of band switching circuit is less, can reduce the transmission consume of signal, with so that promote the signal quality of product.In addition, can be on same integrated circuit, and direct this integrated circuit of volume production on production line with components such as power divider, frequency mixer, local oscillator, commutation circuit and microcontrollers, and then improve the fine ratio of product of product.
The above only is preferred embodiment of the present invention, and all equivalent variations and modifications of being done according to the present patent application claim all should belong within the scope that the present invention contains.
Claims (20)
1. band switching circuit, in order to receive a reduced frequency input signal, described reduced frequency input signal comprises one first data-signal that is positioned at one first frequency range, one the 3rd data-signal that is positioned at one second data-signal of one second frequency range and is positioned at one the 3rd frequency range, and described the 3rd frequency range is higher than described second frequency range and described second frequency range is higher than described first frequency range, and described band switching circuit comprises:
One band pass filter is used for carrying out a bandpass filtering and moves on described reduced frequency input signal, filters the back signal to produce one first, and wherein said first filters the back signal comprises described second data-signal that is positioned at described second frequency range;
One band stop filter, being used for carrying out a bandreject filtering moves on described reduced frequency input signal, filter the back signal to produce one second, wherein said second filters the back signal comprises described first data-signal that is positioned at described first frequency range and described the 3rd data-signal that is positioned at described the 3rd frequency range;
One first power divider is coupled to described band stop filter, is used for filtering the back signal according to described second and produces one first separation signal and one second separation signal;
One local oscillator is used to provide a local oscillated signal;
One frequency mixer is coupled to described first power divider and described local oscillator, is used for adjusting according to described local oscillated signal the frequency of described second separation signal, to produce raising frequency second separation signal;
One switches circuit, is coupled to described first power divider and described frequency mixer, is used for to select one from described first separation signal and described second separation signal of raising frequency according to a selection signal, and exports an output signal;
One high pass filter is coupled to described commutation circuit, is used for carrying out a high-pass filtering and moves on described output signal, filters the back signal to produce one the 3rd;
One second power divider is coupled to described band pass filter and described high pass filter, is used for merging described first and filters back signal and described the 3rd filtration back signal, to produce a combined signal; And
One low pass filter is coupled to described second power divider, is used for carrying out a low-pass filtering and moves on described combined signal, filters the back signal to produce one the 4th.
2. band switching circuit as claimed in claim 1, wherein said first frequency range drops on 250～750MHz, and described second frequency range drops on 950～1450MHz, and described the 3rd frequency range drops on 1650～2150MHz.
3. band switching circuit as claimed in claim 1, the wherein said the 4th filters the back signal comprises described second data-signal that is positioned at described second frequency range and described the 3rd data-signal that is positioned at described the 3rd frequency range.
4. band switching circuit as claimed in claim 1, the wherein said the 4th filters the back signal comprises described second data-signal that is positioned at described second frequency range and described first data-signal that is positioned at described the 3rd frequency range.
5. band switching circuit as claimed in claim 1 also comprises a microcontroller, is coupled to described commutation circuit and described local oscillator, is used to provide described selection signal and gives described commutation circuit, and provide a power supply to described local oscillator.
6. band switching circuit as claimed in claim 5, wherein said first power divider, described local oscillator, described frequency mixer, described commutation circuit and described microcontroller are arranged on the same integrated circuit.
7. band switching circuit as claimed in claim 1, described band switching circuit are applied in the satellite TV system, and wherein said reduced frequency input signal is a reduced frequency satellite-signal.
8. band switching circuit, in order to receive a reduced frequency input signal, described reduced frequency input signal comprises one first data-signal that is positioned at one first frequency range, one the 3rd data-signal that is positioned at one second data-signal of one second frequency range and is positioned at one the 3rd frequency range, and described the 3rd frequency range is higher than described second frequency range and described second frequency range is higher than described first frequency range, and described band switching circuit comprises:
One band pass filter is used for carrying out a bandpass filtering and moves on described reduced frequency input signal, filters the back signal to produce one first, and wherein said first filters the back signal comprises described second data-signal that is positioned at described second frequency range;
One band stop filter, being used for carrying out a bandreject filtering moves on described reduced frequency input signal, filter the back signal to produce one second, wherein said second filters the back signal comprises described first data-signal that is positioned at described first frequency range and described the 3rd data-signal that is positioned at described the 3rd frequency range;
One first power divider is coupled to described band stop filter, is used for filtering the back signal according to described second and produces one first separation signal and one second separation signal;
One local oscillator is used to provide a local oscillated signal;
One frequency mixer is coupled to described first power divider and described local oscillator, is used for adjusting according to described local oscillated signal the frequency of described second separation signal, to produce raising frequency second separation signal;
One switches circuit, is coupled to described first power divider and described frequency mixer, is used for to select one from described first separation signal and described second separation signal of raising frequency according to a selection signal, and exports an output signal;
One high pass filter is coupled to described commutation circuit, is used for carrying out a high-pass filtering and moves on described output signal, filters the back signal to produce one the 3rd; And
One second power divider is coupled to described band pass filter and described high pass filter, is used for merging described first and filters back signal and described the 3rd filtration back signal, to produce a combined signal.
9. band switching circuit as claimed in claim 8, wherein said first frequency range drops on 250～750MHz, and described second frequency range drops on 950～1450MHz, and described the 3rd frequency range drops on 1650～2150MHz.
10. band switching circuit as claimed in claim 8 also comprises a microcontroller, is coupled to described commutation circuit and described local oscillator, is used to provide described selection signal and gives described commutation circuit, and provide a power supply to described local oscillator.
11. band switching circuit as claimed in claim 10, wherein said first power divider, described local oscillator, described frequency mixer, described commutation circuit and described microcontroller are arranged on the same integrated circuit.
12. band switching circuit as claimed in claim 8, described band switching circuit are applied in the satellite TV system, wherein said reduced frequency input signal is a reduced frequency satellite-signal.
13. band switching circuit as claimed in claim 12, described band switching circuit are a B band switching circuit.
14. a satellite TV system comprises:
One lnb, in order to receive a satellite-signal, and carry out frequency reducing and amplify to produce a reduced frequency satellite-signal, described reduced frequency satellite-signal comprises one first data-signal that is positioned at one first frequency range, one the 3rd data-signal that is positioned at one second data-signal of one second frequency range and is positioned at one the 3rd frequency range, and described the 3rd frequency range is higher than described second frequency range and described second frequency range is higher than described first frequency range;
One band switching circuit is coupled to described lnb, and in order to receive described reduced frequency satellite-signal, described band switching circuit comprises:
One band pass filter is used for carrying out a bandpass filtering and moves on described reduced frequency satellite-signal, filters the back signal to produce one first, and wherein said first filters the back signal comprises described second data-signal that is positioned at described second frequency range;
One band stop filter, being used for carrying out a bandreject filtering moves on described reduced frequency satellite-signal, filter the back signal to produce one second, wherein said second filters the back signal comprises described first data-signal that is positioned at described first frequency range and described the 3rd data-signal that is positioned at described the 3rd frequency range;
One first power divider is coupled to described band stop filter, is used for filtering the back signal according to described second and produces one first separation signal and one second separation signal;
One local oscillator is used to provide a local oscillated signal;
One frequency mixer is coupled to described first power divider and described local oscillator, is used for adjusting according to described local oscillated signal the frequency of described second separation signal, to produce raising frequency second separation signal;
One switches circuit, is coupled to described first power divider and described frequency mixer, is used for to select one from described first separation signal and described second separation signal of raising frequency according to a selection signal, and exports an output signal;
One high pass filter is coupled to described commutation circuit, is used for carrying out a high-pass filtering and moves on described output signal, filters the back signal to produce one the 3rd;
One second power divider is coupled to described band pass filter and described high pass filter, is used for merging described first and filters back signal and described the 3rd filtration back signal, to produce a combined signal; And
One low pass filter is coupled to described second power divider, is used for carrying out a low-pass filtering and moves on described combined signal, filters the back signal to produce one the 4th; And
One satellite Integrated Receive Decoder is coupled to described band switching circuit, in order to receive described the 4th filtration back signal and to decode.
15. satellite TV system as claimed in claim 14 also comprises:
One variable connector device, be coupled between described lnb and the described band switching circuit, have a plurality of input ports and a plurality of output port, described a plurality of input port is used for receiving described reduced frequency satellite-signal and a plurality of signal of video signal and merges to produce one and merges back reduced frequency satellite-signal, and one of them distributes to described band switching circuit with described merging back reduced frequency satellite-signal described a plurality of output ports.
16. satellite TV system as claimed in claim 14, wherein said first frequency range drops on 250～750MHz, and described second frequency range drops on 950～1450MHz, and described the 3rd frequency range drops on 1650～2150MHz.
17. satellite TV system as claimed in claim 14, the wherein said the 4th filters the back signal comprises described second data-signal that is positioned at described second frequency range and described the 3rd data-signal that is positioned at described the 3rd frequency range.
18. satellite TV system as claimed in claim 14, the wherein said the 4th filters the back signal comprises described second data-signal that is positioned at described second frequency range and described first data-signal that is positioned at described the 3rd frequency range.
19. satellite TV system as claimed in claim 14 also comprises a microcontroller, is coupled to described commutation circuit and described local oscillator, is used to provide described selection signal and gives described commutation circuit, and provide a power supply to described local oscillator.
20. satellite TV system as claimed in claim 19, wherein said first power divider, described local oscillator, described frequency mixer, described commutation circuit and described microcontroller are arranged on the same integrated circuit.
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| CN2009101486266A CN101931794B (en) | 2009-06-25 | 2009-06-25 | Band switching circuit and relative satellite television system thereof |
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| CN2009101486266A CN101931794B (en) | 2009-06-25 | 2009-06-25 | Band switching circuit and relative satellite television system thereof |
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| CN101931794B CN101931794B (en) | 2012-05-23 |
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| CN103384323A (en) * | 2012-05-04 | 2013-11-06 | 永辰科技股份有限公司 | Signal stack transmission system |
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| TW472439B (en) * | 1995-10-23 | 2002-01-11 | Thomson Consumer Electronics | Apparatus for controlling the conversion gain of a down converter |
| JP3627349B2 (en) * | 1996-02-26 | 2005-03-09 | 松下電器産業株式会社 | High frequency receiver for digital communication |
| WO2002052724A1 (en) * | 2000-12-22 | 2002-07-04 | Ube Industries, Ltd. | Multiplexer |
| CN100396092C (en) * | 2005-02-24 | 2008-06-18 | 启碁科技股份有限公司 | Wireless signal transmission apparatus capable of transmitting multi-channel data |
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