TWI482493B - Low noise block converter and outdoor unit - Google Patents

Description

Low noise frequency reducer and outdoor receiving device

The present invention relates to a low noise downconverter, and more particularly to a low noise downconverter that facilitates the installation of an outdoor receiving device.

The technology of using satellite systems to broadcast television programs has been a technique commonly used by communication operators. Figure 1 shows the architecture of the satellite broadcasting system. The terrestrial broadcast station 102 transmits an uplink frequency band of a radio frequency (RF) signal 104 carrying program information to the satellite 106. The satellite 106 has a plurality of transponders for relaying satellite communications. The radio frequency signals can be amplified and converted into a downlink frequency, and then amplified by power to the ground, and transmitted through the ground to about 10.7 GHz. The downlink frequency band of -12.75 Hz transmits the transposed program information back to the terbolic antenna 110. In order to fully utilize the bandwidth, the satellite signal 108 may be a polarized satellite signal, ie H (Horizontal) or V (Vertical). The waveguide 112 at the focus of the dish antenna 110 collects the satellite signal 108, and then reduces the signal to a medium frequency of about 950 MHz to 2150 MHz by a low noise block converter (LNB) 114 (Intermediate Frequency; IF) ) Frequency band. The signal dropped to the intermediate frequency band can be transmitted to each user's Integrated Receiver and Decoder (IRD) 118a-118n via a coaxial cable 116, and the decoded signal can be played through the display 120a-120n. . The receive decoder 118 accepts the channel selection signal input by the user, thereby causing the low noise downconverter 114 and the receive decoder 118 to receive the signal of the selected channel.

It is conventional to install the dish antenna by the installer to adjust the orientation and angle of the antenna to the direction of the satellite. For example, in Taiwan, to receive a geosynchronous satellite operating along the equator, the antenna should be oriented generally toward the south. Then, according to the elevation angle and direction of different satellites relative to the receiving ground, the adjustment is made. In order to accurately adjust the antenna horizontal elevation angle and azimuth angle, the installation antenna will connect the low noise down-converter together. The installer needs to analyze the received signal with the spectrum analyzer and dB instrument to determine whether the received signal is from the desired satellite. . If the antenna is adjusted without a spectrum analyzer, if the user adjusts itself, the user needs to connect the antenna to the display device, and then adjust the antenna according to the viewing status displayed on the display. In the configuration of a single cable and multiple receiver decoders, each household of the same building will share an antenna and a low noise downconverter. The antenna installation of this configuration will be less suitable for the method of adjusting the antenna. Figure 2A shows the results observed at the output of the low noise downconverter after the dish antenna is connected to the low noise downconverter in this configuration. Because of this configuration, multiple users share frequency band resources in a Frequency Division Multiplex (FDM) mode. Therefore, the low noise down-converter must wait until the indication from the user end is received before determining the receiving frequency band. . Therefore, during the installation of the dish antenna and the low noise downconverter, it is not possible to adjust the horizontal elevation angle and azimuth of the antenna by directly observing the viewing condition of the display. In this case, the installer needs to input a command to the low noise downconverter by a specific instrument to enable the low noise downconverter to receive signals of certain frequency bands, as shown in FIG. 2B. Therefore, if there is a receiving device that conveniently adjusts the horizontal elevation angle and azimuth of the antenna, the problem of the current viewer or installer is inevitably reduced.

One embodiment of the low noise downconverter of the present invention includes a receiving component group, a frequency reducing component group, a memory storage medium, and a processor. The receiving component group is configured to receive a set of satellite signals. The memory storage medium is used to store a plurality of preset data. The processor reads the plurality of preset data of the memory storage medium, and adjusts the oscillation frequency according to the preset data when operating in an installation mode. The down-converting component group processes the satellite signals and generates a complex down-converted signal based on a set of oscillation frequencies.

An embodiment of the outdoor receiving device of the present invention includes an antenna, a waveguide, and a low noise downconverter. The waveguide is placed at the focus of the antenna to collect the complex satellite signals. The low noise down converter includes a receiving component group, a frequency reducing component group, a memory storage medium, and a processor. The receiving component group is configured to receive satellite signals from the waveguide. The memory storage medium is used to store a plurality of preset data. The processor reads the plurality of preset data of the memory storage medium, and adjusts the oscillation frequency according to the preset data when operating in an installation mode. The frequency reducing component group down-converts the satellite signal into a complex down-converting signal according to a set of oscillation frequencies.

3 shows a schematic diagram of the architecture of the low noise downconverter 30 to which the present invention is applied, including a receiving component group 302, a frequency down component group 304, a memory storage medium 308, a processor 306, and the like. The receiving component group 302 is configured to receive a set of satellite signals, and the satellite signals may be a pair of electromagnetic wave signals whose oscillation directions are perpendicular to each other, and are recorded as V and H. The down-converting component group 304 processes the satellite signals described above and generates a complex down-converted signal. The memory storage medium 308 stores a plurality of preset materials. The processor 306 reads the plurality of preset data carried by the memory storage medium 308. Where When the processor 306 is operating in an installation mode, the oscillation frequency of the frequency reduction component group 304 can be adjusted according to the data stored in the memory storage medium 308 to receive the satellite signal specified by the stored data.

In some embodiments of the present invention, the plurality of preset data is a preset channel and a preset oscillation frequency comparison table. When the oscillation frequency of the frequency reducing component group 304 is adjusted to the preset oscillation frequency, the frequency reduction is performed. The signal has information on the above preset channels. For example, Table 1 is an example of a preset channel and a preset oscillation frequency. When the low noise down-converter operates in the installation mode, the down-converting component group will have a preset channel of 75, or a channel with a daily satellite signal frequency in the range of 11.2125-11.75 GHz, with an oscillation frequency of 9.75 GHz. frequency. Therefore, when the low noise down-converter enters the installation mode, the processor 308 causes the down-converting component group to have the channel numbered as 9.75 GHz or the satellite signal frequency in the range of 11.2125-11.75 GHz according to the content of Table 1. Frequency to an IF band.

However, the item of the predetermined data is not limited to the relationship between the preset channel and the preset oscillation frequency, and other information that can be received by the low noise down buffer to receive the specific frequency band can be pre-stored in the memory storage medium 308 by the predetermined data mode. Such as polarization information, frequency slot information, satellite name, transponder number or other information that can be used to limit the target frequency band of the low noise downconverter. Since different transponders on each satellite are responsible for processing signals in different frequency bands or different content, it is also possible to specify the number of transponders on a particular satellite. In order for the low noise downconverter to receive signals of a specific frequency band. In a preferred embodiment of the invention, the low noise down converter 30 is connected to the installation mode after being connected to a power source. Therefore, when the installer wants to install an antenna connected to a low noise downconverter, the low noise downconverter automatically receives signals of certain frequency bands after the antenna and the low noise downconverter device are connected to the power supply. The installer can adjust the horizontal elevation angle and azimuth of the antenna according to the signal strength of the low noise downconverter, and finally take the antenna horizontal elevation angle and azimuth angle with the maximum signal strength. After the installation is complete, the low noise down converter 30 can operate in a user viewing mode after receiving an instruction from any of the receiving decoders. In other references, the user viewing mode, also known as the falling mode, means that the low noise downconverter enters another mode of operation upon receiving an instruction from any of the receiving decoders. The oscillation frequency of the down-converting component group in the user viewing mode is adjusted according to the user demand signal.

In a single cable, multi-user viewing configuration, the low noise down converter 30 may further include a multiplexer 310, and the frequency down component group may include multiple frequency downers for simultaneously processing multiple frequency bands. The down-converted signal enables a cable 312 to transmit the multiplexed signal to the receiver 314 of each user. In other embodiments of the present invention, the low noise down converter 30 can also enter the above installation mode according to a user input signal for adjusting the horizontal elevation angle and the azimuth of the antenna.

In some embodiments of the invention, the set of receiving elements 302 includes a Low Noise Amplifier (LNA). The downconverting component set 304 includes a local oscillator, a mixer, and a filter. The oscillation frequency of the local oscillator is an adjustable parameter, so the preset oscillation frequency can be returned according to the processor 306. To change the frequency band to be received. The filter removes the image signal generated after the mixing or the signal outside the band to be received.

In other embodiments of the invention, the low noise downconverter is coupled to an outdoor receiving device, i.e., the low noise downconverter is coupled to and interacts with the dish, the waveguide, and the like.

4 is a flow chart showing a method of applying an embodiment of the present invention to process satellite signals. Initially, a set of satellite signals is received, as in step S401. Step S402, extracting a plurality of preset data. When operating in an installation mode, an oscillation frequency is adjusted according to the plurality of preset data; when operating in a user viewing mode, the oscillation frequency is adjusted according to a user demand signal, as by step S403. The satellite signals are down-converted according to the oscillation frequency to generate a set of down-converted signals, as by step S404. In a preferred embodiment of the present invention, the preset data may be a preset channel, a frequency slot information, and a preset oscillation frequency comparison table. When the oscillation frequency is adjusted to the preset oscillation frequency, the down-converted signal has information of the preset channel. The preset data may be a polarization information, and the receiving satellite signal in step S401 includes receiving the satellite signal according to the polarization information. In other embodiments of the present invention, the preset data may include a frequency converter number and a preset oscillation frequency comparison table. When the oscillation frequency is adjusted to the preset oscillation frequency, the frequency reduction signal has a corresponding frequency conversion. Information after the frequency of the device.

The technical content and technical features of the present invention are disclosed above, but those skilled in the art can still make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should not be limited to those disclosed in the embodiments, but should include various alternatives without departing from the invention. Modifications and modifications are covered by the scope of the following patent application.

102‧‧‧ terrestrial broadcasting station

104, 108‧‧‧ RF signals

106‧‧‧ Satellite

110‧‧‧ dish antenna

112‧‧‧guide tube

114‧‧‧Low noise amplifier

116‧‧‧Coaxial cable

118‧‧‧Receiver decoder

120‧‧‧ display

30‧‧‧Low noise downconverter

302‧‧‧Receive component group

304‧‧‧Down Frequency Component Group

306‧‧‧ Processor

308‧‧‧Memory storage media

310‧‧‧Multiplexer

312‧‧‧ coaxial cable

314a-314n‧‧‧ Receive decoder

Figure 1 shows the architecture of the satellite broadcasting system; Figure 2a and Figure 2b show the results of the low noise amplifier output after the dish antenna is connected to the low noise downconverter; Figure 3 shows the low noise downconverter to which the present invention is applied. Schematic diagram of the architecture; and Figure 4 shows a flow chart of a method for processing an embodiment of a satellite signal using the present invention.

30. . . Low noise down converter

302. . . Receiving component group

304. . . Frequency reduction component group

306. . . processor

308. . . Memory storage medium

310. . . Multiplexer

312. . . Coaxial cable

314a-314n. . . Receive decoder

Claims (13)

A low noise down-converter is applicable to a satellite communication system, comprising: a receiving component group for receiving a set of satellite signals; and a frequency reducing component group for processing the satellite signals and generating according to a set of oscillation frequencies a plurality of frequency-reduction signals; a memory storage medium for storing a plurality of preset data; and a processor for reading the plurality of preset data of the memory storage medium, and operating in an installation mode, according to the preset data And adjusting the oscillating frequency; wherein the plurality of preset data includes a preset channel and a preset oscillating frequency comparison table, and the oscillating frequency of the frequency reducing component group is adjusted to the preset oscillating frequency, wherein the down-converted signal has the preset channel The above-mentioned plurality of preset data includes a frequency converter number and a preset oscillation frequency comparison table, and when the oscillation frequency of the frequency reduction component group is adjusted to the predetermined oscillation frequency, the frequency reduction signal has a corresponding frequency conversion Information after the frequency of the device. The low noise down converter according to claim 1, wherein the plurality of preset data includes a polarization information, and the receiving component group receives the satellite signal according to the polarization information. The low noise down converter according to claim 1, wherein the comparison table further includes a frequency slot information, and the frequency reducing component group processes the satellite signal according to the frequency slot information. The low noise down converter according to claim 1, wherein the processor is required by a user when operating in a user viewing mode. The signal is adjusted to adjust the oscillation frequency of the above-mentioned frequency reducing component group. The low noise down converter according to claim 4, further comprising a multiplexer for multiplexing the down frequency signal to enable the cable to transmit the multiplexed signal to the receiver of the plurality of users . The low noise down converter of claim 1, wherein the installation mode is entered after the low noise down converter is connected to a power source. The low noise down converter of claim 1, wherein the installation mode is entered according to a user input signal. The low noise down converter of claim 1, wherein the user viewing mode is entered after the low noise downconverter receives an instruction from a receiving decoder. An outdoor receiving device includes: an antenna; a waveguide, located at a focus of the antenna, for collecting a plurality of satellite signals; and a low noise amplifier comprising: a receiving component group for receiving the above-mentioned waveguide a satellite signal group; a frequency reducing component group for processing the satellite signal, and generating a plurality of frequency down signals according to a set of oscillation frequencies; a memory storage medium for storing the plurality of preset data; and a processor for reading the memory Storing a plurality of preset data of the medium, and adjusting the oscillation frequency according to the preset data when operating in an installation mode; The above-mentioned plurality of preset data includes a preset channel and a preset oscillation frequency comparison table, and when the oscillation frequency of the frequency reduction component group is adjusted to the preset oscillation frequency, the down-converted signal has information of the preset channel; The plurality of preset data includes a frequency converter number and a preset oscillation frequency comparison table, and when the oscillation frequency of the frequency reducing component group is adjusted to the preset oscillation frequency, the frequency reduction signal has a frequency conversion corresponding to the frequency converter number Post information. The outdoor receiving device according to claim 9, wherein when the processor is operated in a user viewing mode, the processor adjusts an oscillation frequency of the frequency reducing component group according to a user demand signal. The outdoor receiving device according to claim 9, wherein the low noise downconverter enters the above installation mode after being connected to a power source. The outdoor receiving device of claim 9, wherein the installation mode is entered according to a user input signal. The outdoor receiving device according to claim 9, wherein the user viewing mode is entered after the low noise down converter receives any command from.