Satellite signal collinear transmission method, satellite signal collinear receiving method and outdoor unit device

Abstract

The invention discloses a satellite signal collinear transmission method, a satellite signal collinear receiving method and an outdoor unit device, relates to the field of satellite televisions, and is used for multiple users to share one satellite antenna and one cable to receive satellite signals. The method comprises the following steps: acquiring at least one path of satellite signal received by a tuner LNB; respectively converting different program frequency points of the obtained satellite signal into zero intermediate frequency digital signals; modulating each zero intermediate frequency digital signal into a radio frequency signal of a corresponding frequency point; all radio frequency signals are mixed and transmitted in the same cable after power amplification. Satellite signals are uniformly received through the same satellite antenna, and radio frequency signals of different program frequency points are transmitted through the same cable, so that the cost and complexity of hardware equipment, wiring and installation are reduced.

Description

Technical Field

[0001] The present invention relates to the field of satellite television, and in particular to a method for collinear transmission of satellite signals, a receiving method, and an outdoor unit device ODU (OUT DOOR UNIT). Background Art

[0002] Existing satellite television signals (or satellite signals) of horizontal polarization and vertical polarization are received separately. The frequency points of the two polarizations coincide with each other and cannot be received by multiple set-top boxes simultaneously. When a traditional satellite antenna receives satellite signals, only one set-top box STB (Set Top Box) can receive signals corresponding to one satellite antenna. When there are multiple users at the same location (such as in the same building), each user needs a satellite antenna and a cable (coaxial cable or optical fiber) from the satellite antenna to indoors. Summary of the Invention

[0003] The object of the present invention is to provide a method for collinear transmission of satellite signals, a receiving method, and an outdoor unit device, in order to solve all or part of the above problems, and to enable multiple users to share one satellite antenna and one cable to receive satellite signals.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A method for collinear transmission of satellite signals includes:

[0006] Obtaining satellite signals received by at least one low-noise block (LNB);

[0007] Converting different program frequency points of the obtained satellite signals into zero-intermediate-frequency digital signals respectively;

[0008] Modulating each of the zero-intermediate-frequency digital signals into a radio frequency signal of a corresponding frequency point respectively;

[0009] Mixing and power-amplifying all the radio frequency signals and then transmitting them in the same cable.

[0010] The present invention also provides a method for collinear reception of satellite signals, which includes:

[0011] Receiving satellite signals by using a satellite antenna;

[0012] Transmitting the satellite signals by using the above-mentioned method for collinear transmission of satellite signals;

[0013] Multiple users are respectively connected to the cable for transmitting satellite signals;

[0014] Each user respectively obtains a radio frequency signal from the cable and then decodes and outputs it.

[0015] The present invention also provides a satellite outdoor unit device, which includes at least one RF input terminal and one RF output terminal, and further includes a power supply circuit, a frequency point selection switch circuit, a down-conversion circuit, a modulation circuit, a signal mixing circuit, an amplification circuit and a control circuit; the power supply circuit supplies power to the entire satellite outdoor unit device;

[0016] The satellite signals input from the RF input terminal are transmitted to the down-conversion circuit, and the down-conversion circuit, under the control of the control circuit, converts different program frequency points of the satellite signals into zero-IF digital signals respectively and transmits them to the modulation circuit; the modulation circuit, under the control of the control circuit, modulates each of the zero-IF digital signals into RF signals of corresponding frequency points; the signal mixing circuit mixes all the RF signals and then transmits them to the amplification circuit for power amplification, and then outputs them from the RF output terminal; the frequency point selection switch circuit selects one RF signal from the RF signals output from the RF output terminal for decoding.

[0017] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0018] This application converts the same-frequency signals of different polarizations of satellite signals into RF signals of different program frequency points for coaxial transmission. The satellite signals are received uniformly through the same satellite antenna, and then the RF signals of different program frequency points are transmitted through the same cable. Different users can access this cable to watch satellite TV programs simultaneously, and the channel switching of each user does not affect each other, reducing the costs and complexities of hardware equipment, wiring and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described by way of examples with reference to the accompanying drawings, where:

[0020] Figure 1 is a flowchart of the satellite signal coaxial transmission method provided by an embodiment of the present application.

[0021] Figure 2 is a structural diagram of the satellite outdoor unit device provided by an embodiment of the present application.

[0022] Figure 3 is a schematic diagram of the power supply circuit in an embodiment of the present application. Among them, sub-figure (a) is a circuit diagram of DC48V - DC3.3V, and sub-figure (b) is a circuit diagram of DC48V - DC5V.

[0023] Figure 4 is a schematic diagram of the power distribution circuit in an embodiment of the present application.

[0024] Figure 5 is a schematic diagram of the down-conversion circuit in an embodiment of the present application.

[0025] Figure 6 It is the schematic diagram of the modulation circuit in the embodiment of the present application.

[0026] Figure 7 It is the schematic diagram of the signal mixing circuit and the amplification circuit in the embodiment of the present application.

[0027] Figure 8 It is the schematic diagram of the control circuit in the embodiment of the present application.

[0028] Figure 9 It is the schematic diagram of the frequency point selection switch circuit in the embodiment of the present application. Specific embodiments

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0030] Any feature disclosed in this specification (including any additional claims, abstract) can be replaced by other equivalent or similar-purpose alternative features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only an example in a series of equivalent or similar features.

[0031] Regarding the problem that each current set-top box requires an independent satellite antenna to receive satellite signals and an independent cable to transmit satellite signals, resulting in high hardware costs, installation costs, and complex wiring when there are multiple users in the same location, the embodiment of the present application provides a satellite signal coaxial transmission method, a receiving method, and an outdoor unit device, aiming to enable multiple users to share the same satellite antenna and the same cable to receive and transmit satellite signals, and different users only need to access the same cable to achieve non-interfering viewing.

[0032] As Figure 1 shown, the satellite signal coaxial transmission method provided by the embodiment of the present application includes the following processes:

[0033] Obtain satellite signals received by at least one low-noise block downconverter (LNB);

[0034] Convert different program frequency points of the obtained satellite signals into zero-intermediate-frequency digital signals respectively;

[0035] Modulate each zero-intermediate-frequency digital signal into a radio frequency signal of the corresponding frequency point respectively;

[0036] Mix and power-amplify all radio frequency signals and then transmit them in the same cable.

[0037] As an alternative embodiment, the number of supported LNBs is 4, that is, the number of acquired satellite signals is at most 4. A larger or smaller number of satellite signals can also be supported. However, considering the hardware cost and the signal quality after power splitting, 4 satellite signals is a more appropriate number.

[0038] In some alternative embodiments, the operation of converting different program frequency points of the acquired satellite signals into zero-IF digital signals respectively includes the following process:

[0039] Regardless of the number of LNBs accessed, each satellite signal is amplified respectively and then multi-way power distribution is performed. This process can be completed by a power distribution circuit with a predetermined ratio.

[0040] For each signal after power distribution of each satellite signal, it is tuned into a zero-IF digital signal of a different program frequency point respectively. This tuning process can be completed by a down-conversion circuit.

[0041] Through the above operations, the same-frequency signals of different polarizations of the satellite signal are converted into zero-IF digital signals of different frequencies (frequency points). Then, each zero-IF digital signal is up-converted to the corresponding signal frequency point respectively and adjusted into a radio frequency signal, so that they can be transmitted in the same cable without mutual influence.

[0042] As an alternative embodiment, when performing multi-way power distribution on each satellite signal, each satellite signal is divided into at most 8 paths, that is, the power distribution of each satellite signal does not exceed 8 paths. In this way, in the preferred embodiment of the present application, 4 satellite signals received by 4 LNBs are obtained, and each satellite signal is subjected to 8-way power distribution, then the coaxial transmission of radio frequency signals of 32 program frequency points is finally realized, corresponding to 32 channels. And according to the actual situation, more program frequency points can be expanded in the same way.

[0043] In some feasible embodiments, in the process of adjusting each zero-IF digital signal into a radio frequency signal of the corresponding program frequency point respectively, the frequency range of the radio frequency signal is 950 MHz - 2150 MHz, realizing wide-frequency coverage.

[0044] The satellite signal coaxial reception method provided by the embodiment of the present application includes the following process:

[0045] First, a (same) satellite antenna is used to receive satellite signals;

[0046] Then, the satellite signal coaxial transmission method of the above embodiment is used to transmit the received satellite signals;

[0047] Multiple users access the cable for transmitting satellite signals respectively;

[0048] After each user obtains the radio frequency signal from the cable and decodes it, the viewing is completed.

[0049] Through the above method, multiple users can respectively receive radio frequency signals of multiple program frequencies through the same cable (such as coaxial cable or optical fiber, and when using optical fiber, optical - electrical converters are required at both ends of the cable), and the viewing and program switching do not affect each other.

[0050] As an alternative implementation, during the process of each user obtaining the radio frequency signal from the cable and decoding it, especially after obtaining the radio frequency signal from the cable, the program frequency can be switched through frequency - shift keying or digital devices. After switching to the corresponding radio frequency signal, the corresponding program is decoded and output. The program is switched by using frequency - shift keying or digital devices to search for radio frequency signals of different frequencies.

[0051] As Figure 2 As shown, the satellite outdoor unit device provided by the embodiment of the present application includes at least one radio frequency input end and one radio frequency output end, and also includes a power supply circuit, a frequency - point selection switch circuit, a down - conversion circuit, a modulation circuit, a signal mixing circuit, an amplification circuit, and a control circuit; the power supply circuit supplies power to the entire satellite outdoor unit device.

[0052] The satellite signal input from the radio frequency input end is transmitted to the down - conversion circuit. The down - conversion circuit, under the control of the control circuit (controlling different tuning frequencies), respectively converts different program frequencies of the satellite signal into zero - intermediate - frequency digital signals and transmits them to the modulation circuit. The modulation circuit, under the control of the control circuit (controlling different modulation frequencies), respectively modulates each zero - intermediate - frequency digital signal into a radio frequency signal of the corresponding frequency. The signal mixing circuit mixes all the radio frequency signals and transmits them to the amplification circuit for power amplification, and then outputs them from the radio frequency output end. The frequency - point selection switch circuit selects one radio frequency signal from the radio frequency signals output from the radio frequency output end for decoding.

[0053] As an alternative implementation, the above - mentioned satellite outdoor unit device can be designed with 1 - 4 radio frequency input ends to receive satellite signals received by 1 - 4 satellite LNBs.

[0054] Optionally, the above - mentioned power supply circuit is composed of a DC - DC chip and its peripheral circuits. The DC - DC chip realizes the conversion from DC24 / 48V to DC5V and DC3.3V for different circuits to use electricity.

[0055] In some feasible implementation manners, as Figure 3 shown, the DC - DC chip adopts TPS54560DDAR, and with the corresponding peripheral circuits, the power management chip TPS7A8400RGRR outputs a DC voltage of 3.3V or 5V. As Figure 3Sub - figure (a) is an embodiment of the DC48V - to - DC3.3V circuit, and sub - figure (b) is an embodiment of the DC48V - to - DC5V circuit.

[0056] As an alternative implementation, a power distribution circuit is connected between the RF input terminal and the down - conversion circuit. The satellite signals input from the RF input terminal are transmitted to the power distribution circuit for multi - path power distribution; each path of the signals after power distribution of all satellite signals is respectively transmitted to the down - conversion circuit to be converted into zero - intermediate - frequency digital signals of different program frequencies.

[0057] In addition, optionally, a power amplifier circuit is also connected between the RF input terminal and the power distribution circuit to amplify the satellite signals before power distribution.

[0058] In some feasible embodiments, it is assumed that at least one path of satellite signals is subjected to 8 - path power distribution. As Figure 4 shown, after being received and processed by the satellite receiver STI8036B, the satellite signals are transmitted to the RF connector RFT3. The satellite signals input from the RF connector RFT3 are amplified by the amplifier ERA - 51SM and then subjected to power distribution through three - stage two - way splitters (a total of 2 0 +2 1 +2 2 = 7 two - way splitters GP2S1 +, a total of 2 3 = 8 paths) of power distribution. In some specific embodiments, assuming that each path of satellite signals passes through the Figure 4 shown circuit, when there are 4 RF input terminals and each RF input terminal is connected to the satellite signals received by a satellite path LNB, a total of 4×8 = 32 paths of power - distributed signals are obtained. These 32 paths of power - distributed signals will correspond to 32 program frequencies. In some other specific embodiments, assuming that two paths of satellite signals are subjected to 4 - path (2 - stage, a total of 3 two - way splitters) power distribution, one path of satellite signals is subjected to 8 - path (3 - stage, a total of 7 power two - way splitters) power distribution, and another path of satellite signals is subjected to 16 - path (4 - stage, a total of 15 two - way splitters) power distribution, 32 paths of power - distributed signals are also obtained. Other power distribution designs for 4 paths of satellite signals can also be made, which will not be elaborated here one by one.

[0059] As Figure 5The following is a schematic diagram of the down-conversion circuit adopted in some alternative embodiments of the present application. The down-conversion circuit consists of a tuner M88TS6011 and its peripheral circuits. Each path of the power distribution signal is input from pin 1 of the tuner. Pins 6 and 7 of the tuner are respectively connected to the control circuit, and frequency selection control is performed under the action of the control circuit, with different frequency points selected by each tuner. Pins 14, 15, and 16 of the tuner are connected to DC3.3V. Pin 3 of the tuner is the IIC address selection pin. Pins 4 and 5 of the tuner are connected to a 27MHz crystal oscillator. Pin 8 of the tuner is connected to the control circuit and operates under control (such as enabling or disabling, etc.). Finally, the converted (down-converted) zero-intermediate-frequency digital signals are output from pins 9, 10, 11, and 12 of the tuner. Among them, pins 9 and 10 respectively output the positive and negative poles of the quadrature component (Q branch) of the zero-intermediate-frequency digital signal, and pins 11 and 12 respectively output the negative and positive poles of the in-phase component (I branch) of the zero-intermediate-frequency digital signal. Each path of the zero-intermediate-frequency digital signal is respectively transmitted to the modulation circuit for modulation (up-conversion).

[0060] As an alternative implementation, as Figure 6 shown, the modulation circuit consists of a modulator TRF372017IRGZR and its peripheral circuits. Each path of the zero-intermediate-frequency digital signal after down-conversion by the tuner is respectively connected to a path of the modulation circuit. Specifically, the zero-intermediate-frequency I / Q digital signals output from pins 9, 10, 11, and 12 of the tuner are respectively connected to pins 9, 10, 27, and 28 of the modulator after passing through a 100nF capacitor. Among them, the in-phase component is connected to pins 9 and 10, and the quadrature component is connected to pins 27 and 28. The radio frequency signal after up-conversion is output from pin 18 of the modulator.

[0061] The modulator is also under the action of the control circuit and modulates the zero-intermediate-frequency digital signal at different program frequency points. Specifically, pins 45, 46, and 47 of the modulator are connected to the control circuit for frequency selection control. In addition, pins 3, 7, 30, 32, 35, and 41 of the modulator are respectively connected to DC3.3V. Pins 20 and 21 of the modulator are respectively connected to DC5V. Pin 43 of the modulator is connected to the X1 (40MH) crystal oscillator. Pins 4, 6, 8, 11, 12, 13, 15, 16, 17, 19, 22, 23, 24, 25, 26, 29, 31, 37, 39, 42, and 44 of the modulator are respectively grounded.

[0062] In some preferred implementation manners, the frequency range of the radio frequency signal modulated by the modulation circuit of the satellite outdoor unit device is 950MHz - 2150MHz. Taking the number of the above-mentioned 32 paths of power distribution signals as an example, after passing through the above modulation circuit, the operating frequency points of the 32 paths of radio frequency signals are all different, and the frequency range of the 32 paths of radio frequency signals is 950MHz - 2150MHz. Finally, they are input to the signal mixing circuit for mixed output.

[0063] In the embodiments of the present application, the processes of signal mixing and power distribution are opposite. As Figure 7 shown, in an alternative embodiment, the signal mixing circuit is formed by cascading multiple two-way power dividers. Obviously, the signal mixing circuit can similarly be replaced by a multi-input single-output mixing circuit formed by multi-way power dividers.

[0064] In some feasible embodiments, a power amplifier circuit is further connected to the output terminal (i.e., the RF output terminal) of the signal mixing circuit to amplify and output the mixed RF signal. Refer to Figure 7 , the signal mixing circuit is formed by successively connecting 5 two-way power dividers GP2S1+ ( Figure 7 only the last two stages are shown in 0 ), and the total number of two-way power dividers is 2 1 +2 2 +2 3 +2 4 = 31. An amplifier ERA-51SM is connected to pin 2 of the last two-way power divider, and the amplified RF signal is finally output through the RF connector RFT4.

[0065] The RF connector RFT4 realizes the mixed output of multi-frequency RF signals. Connecting a coaxial cable or an optical fiber (which needs to be used in cooperation with an optical-electric converter) to the RF connector RFT4 realizes the collinear transmission of satellite signals. Taking the coaxial cable as an example, different users can be respectively connected to the collinear transmission coaxial cable to respectively watch 32 programs, and the program switching does not affect each other.

[0066] The control circuit respectively controls the tuning frequency of the down-conversion circuit and the modulation frequency of the modulation circuit. The control circuit can be a single-chip microcomputer, an ARM, or an MCU. As Figure 8 shown, in some alternative embodiments, the main body of the control circuit is a single-chip microcomputer STM32F429IGT6, and the control circuit is formed by cooperating with relevant peripheral circuits.

[0067] The user can select RF signals of different program frequencies from the accessed mixed RF signals through a frequency point selection switch circuit (usually configured in the set-top box) for decoding and viewing. As an alternative embodiment, as Figure 9 shown, the frequency point selection switch circuit includes a decoder M88CS8002 / M88CS8052 and peripheral circuits. For each user, one RF signal can be selected from the 32 mixed RF signals for decoding through the corresponding frequency point selection switch circuit. When the user changes the channel, the frequency point selection switch circuit selects the next RF signal from the 32 mixed RF signals for decoding, and so on; when the user specifies to watch a certain program, the frequency point selection switch circuit selects the RF signal of the corresponding program frequency from the 32 mixed RF signals for decoding.

[0068] The present invention is not limited to the specific embodiments described above. The present invention extends to any new feature or any new combination disclosed in this specification, as well as to any new method or process step or any new combination disclosed.

Claims

1. A method for collinear transmission of satellite signals, characterized in that, Comprising: Obtaining satellite signals received by at least one low-noise block downconverter (LNB); Separately converting different program frequency points of the obtained satellite signals into zero-intermediate-frequency digital signals; Separately modulating each of the zero-intermediate-frequency digital signals into radio frequency signals of corresponding frequency points; Mixing and power-amplifying all the radio frequency signals and transmitting them in the same cable.

2. The satellite signal collinear transmission method according to claim 1, wherein Separately converting different program frequency points of the obtained satellite signals into zero-intermediate-frequency digital signals, including: Amplifying each path of the satellite signals respectively and performing multi-way power distribution; Tuning each path of the signals after power distribution of all satellite signals into zero-intermediate-frequency digital signals of different program frequency points.

3. The satellite signal collinear transmission method according to claim 2, characterized in that, Separately performing multi-way power distribution on each path of the satellite signals, including: Separately performing power distribution of no more than 8 paths on each path of the satellite signals.

4. The satellite signal collinear transmission method according to any one of claims 1-3, characterized in that, The obtaining of satellite signals received by at least one low-noise block downconverter (LNB) includes: Obtaining satellite signals received by at least one and at most four low-noise block downconverters (LNBs).

5. A satellite signal collinear reception method, characterized in that, Comprising: Receiving satellite signals by using a satellite antenna; Transmitting the satellite signals by using the satellite signal co-linear transmission method as described in any one of claims 1-4; Multiple users respectively accessing the cable for transmitting satellite signals; Each user respectively obtaining radio frequency signals from the cable and then decoding and outputting them.

6. The satellite signal collinear reception method according to claim 5, wherein Each user respectively obtaining radio frequency signals from the cable and then decoding and outputting them, including: Each user respectively obtaining radio frequency signals from the cable, performing program frequency point switching through frequency shift keying or digital equipment, and then decoding and outputting them.

7. A satellite outdoor unit device, characterized in that, Including at least one radio frequency input end and one radio frequency output end, and further including a power supply circuit, a frequency point selection switch circuit, a down-conversion circuit, a modulation circuit, a signal mixing circuit, an amplification circuit, and a control circuit; the power supply circuit supplies power to the entire satellite outdoor unit device; The satellite signals input from the radio frequency input end are transmitted to the down-conversion circuit, and the down-conversion circuit, under the control of the control circuit, separately converts different program frequency points of the satellite signals into zero-intermediate-frequency digital signals and transmits them to the modulation circuit; The modulation circuit, under the control of the control circuit, separately modulates each of the zero-intermediate-frequency digital signals into radio frequency signals of corresponding frequency points; The signal mixing circuit mixes all the radio frequency signals and then transmits them to the amplification circuit for power amplification, and then outputs them from the radio frequency output end; the frequency point selection switch circuit selects one radio frequency signal from the radio frequency signals output from the radio frequency output end for decoding.

8. The satellite outdoor unit device according to claim 7, characterized in that, Between the radio frequency input end and the down-conversion circuit, a power distribution circuit is connected; the satellite signals input from the radio frequency input end are transmitted to the power distribution circuit for multi-way power distribution; each path of the signals after power distribution of all satellite signals is respectively transmitted to the down-conversion circuit to be converted into zero-intermediate-frequency digital signals of different program frequency points.

9. The satellite outdoor unit device according to claim 8, characterized in that, The frequency range of the radio frequency signals modulated by the modulation circuit is between 950 MHz and 2150 MHz.

10. The satellite outdoor unit device according to any one of claims 7-9, characterized in that, The number of the radio frequency input ends is from 1 to 4.

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