JP6654879B2 - Satellite broadcast receiver - Google Patents

Description

  The present invention relates to a satellite broadcast receiving apparatus that performs frequency conversion on a satellite broadcast signal obtained via a predetermined receiving antenna apparatus and transmits the signal to a receiver.

  In general, a satellite broadcast receiving system mainly includes a satellite broadcast receiving device 1, a satellite broadcast receiving antenna device 2, a connection cable 3, and a receiver 4, as shown in FIG. The satellite broadcast receiving antenna device 2 is a device that receives a satellite broadcast wave and outputs a signal of the broadcast frequency as a satellite broadcast signal. For example, a parabolic antenna or the like is known. In the satellite broadcast receiving antenna device 2, a probe signal line 2a is usually provided integrally with a power supply unit for receiving and supplying a satellite broadcast wave, and the probe signal line 2a is connected to the broadcast frequency of the satellite broadcast wave via the probe signal line 2a. A corresponding satellite broadcast signal is output from the satellite broadcast receiving antenna device 2 to the satellite broadcast receiving device 1.

  The satellite broadcast receiving apparatus 1 converts a broadcast frequency of an input satellite broadcast signal into an intermediate frequency (IF), and converts the converted signal (IF signal) via a connection cable 3 composed of a coaxial cable or the like. , And output to a receiver 4 such as a television receiver arranged in the house. Then, the receiver 4 can view the satellite broadcast.

  By the way, current satellite broadcasting uses radio waves in the 12 GHz band. If the satellite broadcasting signal in the 12 GHz band is directly transmitted to the receiver 4 via the connection cable 3, the attenuation in the connection cable 3 is large. Therefore, the satellite broadcast receiving apparatus 1 converts the broadcast frequency of the satellite broadcast signal into an intermediate frequency (IF) and transmits the intermediate frequency (IF) to the receiver 4 using the connection cable 3. For this reason, such a satellite broadcast receiving device 1 is also called a converter.

  In addition, current satellite broadcasting uses circularly polarized waves, and at present, BS digital broadcasting in the direction of 110 degrees east longitude (hereinafter abbreviated as “BS”) and broadband CS digital broadcasting in the same direction (hereinafter abbreviated as “CS”). ), And all use right-handed circularly polarized waves.

  Since right-handed and left-handed circularly polarized waves can be used in common, using left-handed circularly polarized waves enables transmission of satellite broadcast waves of another channel even at the same frequency as right-handed circularly polarized waves, making effective use of frequency. Becomes possible. For example, the satellite broadcast receiving apparatus 1 converts the simultaneously received right-handed and left-handed circularly-polarized satellite broadcast waves into respective IF signals, mixes the respective IF signals, and passes through the connection cable 3 formed of a coaxial cable. It is possible to output (for example, see Patent Document 1).

  Therefore, the frequency of the left-handed IF of BS / CS is newly defined in ARIB standard STD-B63 (for example, see Non-Patent Document 1). According to the ARIB standard STD-B63, it is desirable that the connection cable 3 be either a coaxial cable of a uniaxial coaxial distribution system or an optical cable of an optical distribution system composed of a single mode optical fiber.

  According to ARIB standard STD-B63, the right-handed band of the satellite broadcasting (BS / CS) in the 12 GHz band uses 11.71023 GHz to 12.74825 GHz as the broadcasting frequency, and the frequency of the BS / CS right-handed IF 1032.23 MHz to 2070.25 MHz is used. The local oscillation frequency for converting the frequency to the right-handed IF is set to 10.678 GHz.

  On the other hand, the left-handed band of satellite broadcasting (BS / CS) in the 12 GHz band uses 11.72941 GHz to 12.72825 GHz as a broadcasting frequency, and 2244.41 MHz to 3223.25 MHz as the frequency of the BS / CS left-handed IF. I do. The local oscillation frequency for frequency conversion to the left-handed IF is 9.505 GHz as a specified value.

  In addition, digital terrestrial television broadcasting (terrestrial TV) is generally transmitted in-house using the same connection cable 3 as that for satellite broadcasting. The frequency of the terrestrial TV is 470 MHz to 710 MHz. Further, there is a viewing mode in which a cable television signal and a satellite broadcast IF signal are mixed and transmitted through the same connection cable 3. The frequency of the cable television is 10 MHz to 770 MHz. FIG. 8 shows the frequency relationship between the terrestrial TV, the cable television, the right-handed IF of satellite broadcasting (BS / CS) in the 12 GHz band, and the left-handed IF.

  Therefore, in the satellite broadcast receiving system based on the conventional technique, for example, the satellite broadcast receiving antenna device 2 and the satellite broadcast receiving device 1 can be configured as shown in FIG. The receiving antenna device 2 for satellite broadcasting receives the satellite broadcasting wave of the satellite broadcasting (BS / CS) in the 12 GHz band by the frequency extracting unit 21 to extract the broadcasting frequencies of the right-handed circularly polarized wave and the left-handed circularly polarized wave, and Then, the satellite broadcast signal in which the broadcast frequencies of the right-handed circularly polarized wave and the left-handed circularly polarized wave are separated by the polarization separation unit 22 is output to the satellite broadcast receiving apparatus 1.

  The satellite broadcast receiving device 1 illustrated in FIG. 9 includes a first frequency converter 11, a second frequency converter 12, a first local oscillator 13, a second local oscillator 14, a multiplexer 15, and a mixer 16.

  The first frequency conversion unit 11 converts a right-handed circularly polarized satellite broadcast signal into a right-handed IF signal of a 12 GHz band satellite broadcast (BS / CS) using the local oscillation frequency 10.678 GHz from the first local oscillator 13. The signal is converted and output to the multiplexer 15.

  The second frequency conversion unit 12 converts a right-handed circularly polarized satellite broadcast signal into a 12-GHz band satellite broadcast (BS / CS) left-handed IF signal using the local oscillation frequency 9.505 GHz from the second local oscillator 14. And outputs it to the multiplexer 15.

  The multiplexer 15 outputs to the mixer 16 a signal obtained by combining a right-handed IF signal and a left-handed IF signal in satellite broadcasting (BS / CS) in the 12 GHz band.

  The mixer 16 combines the terrestrial TV or cable television signal input from the dedicated input terminal with the right-handed IF signal and left-handed IF signal in the 12 GHz band satellite broadcasting (BS / CS). The signal is mixed with the signal and transmitted to the receiver 4 via the single connection cable 3. In general, filters and amplifiers are mounted on the first and second frequency converters 11 and 12, but illustration thereof is omitted.

  As described above, the satellite broadcast receiving apparatus 1 shown in FIG. 9 uses a single connection cable 3 such as a coaxial cable or the like to use a terrestrial TV, a cable television, a 12 GHz-band satellite broadcast (BS / CS) right-handed IF, and Each signal of the left-handed IF can be transmitted to the receiver 4.

  By the way, a 21 GHz band (21.4 GHz to 22.0 GHz) broadcasting frequency band is currently assigned for satellite broadcasting. If this 21 GHz band satellite broadcast wave is used, a new broadcast such as a so-called 8K Super Hi-Vision or stereoscopic television can be realized. It is also assumed that the 21 GHz band satellite broadcasting wave can be effectively used by sharing the right-handed circularly polarized wave and the left-handed circularly polarized wave.

  For this reason, a satellite broadcasting receiving antenna device that can simultaneously receive satellite broadcasting (BS / CS) in the 12 GHz band and satellite broadcasting in the 21 GHz band is also disclosed (for example, see Patent Document 2).

  When the connection cable 3 is constituted by a coaxial cable, if the loss due to the increase in the cable length cannot be ignored, the connection cable 3 is constituted by an optical fiber, and the satellite broadcast signal of the satellite broadcast is converted by an electric / optical converter. There is disclosed a technique of converting the signal into an optical signal, transmitting the signal to an indoor receiver 4 via a connection cable 3 formed of an optical fiber, and converting the signal into an IF signal on the indoor side where the receiver 4 is arranged (for example, see, for example, Japanese Patent Application Laid-Open No. H11-157572). Patent Document 3).

JP-A-2002-305460 JP 2013-219533 A JP-A-63-33018

“Receiver for Advanced Broadband Satellite Digital Broadcasting, Radio Industry Association Standard ARIB STD-B63 1.3 Edition”, [online], revised on September 30, 2015, ARIB, pp. 11-12, [November 17, 2015 Search], Internet <URL: http://www.arib.or.jp/english/html/overview/doc/2-STD-B63v1_3.pdf> Joji Maeda, “Keywords to Know: Optical Fiber Radio (RoF)”, [online], Journal of the Institute of Image Information and Television Engineers, Vol. 61, No. 1, pp. 43-45 (2007), [November 17, 2015 Date search], Internet <URL: https://www.ite.or.jp/data/a_j_keyword/data/FILE-20111231153519.pdf>

  As described above, a 21 GHz band (21.4 GHz to 22.0 GHz) broadcasting frequency band is currently assigned for satellite broadcasting. If this 21 GHz band satellite broadcast wave is used, a new broadcast such as a so-called 8K Super Hi-Vision or stereoscopic television can be realized. It is also assumed that the 21 GHz band satellite broadcasting wave can be effectively used by sharing the right-handed circularly polarized wave and the left-handed circularly polarized wave.

  However, with the same idea as in the example based on the conventional technique as shown in FIG. 9, when trying to configure the satellite broadcast receiver 1 capable of receiving a 21 GHz band satellite broadcast wave, the 21 GHz A local oscillator for generating a new local oscillation frequency for satellite broadcasting of the band will be separately provided. For this reason, there is a problem that the manufacturing cost of the satellite broadcast receiving apparatus 1 increases and the burden of quality control increases. In particular, if an attempt is made to enable simultaneous reception of satellite broadcasts (BS / CS) of the 12 GHz band and satellite broadcasts of the 21 GHz band, the satellite broadcast receiving apparatus 1 has a 12-GHz band right-hand and left-hand rotation. In addition to the local oscillator, a 21 GHz band local oscillator for clockwise or counterclockwise rotation is required. As a result, there arises a problem that the satellite broadcast receiving apparatus 1 is increased in size, the manufacturing cost is increased due to the increase in the circuit scale, and the burden of quality control is increased.

  The frequency bandwidth required for the IF of the 21 GHz band is about 600 MHz for right-handed circular polarization and about 600 MHz for left-handed circular polarization, so that the total is about 1200 MHz.

  At present, up to 3223.25 MHz is defined as the frequency of the 12 GHz band satellite broadcasting IF, so if the 21 GHz band satellite broadcasting IF signal is arranged at a frequency higher than 3224 MHz, Need to be extended to about 4500 MHz.

  For example, in addition to the terrestrial TV, cable television, right-handed IF of 12 GHz band satellite broadcasting (BS / CS) and its left-handed IF signal, the right-handed IF or left-handed IF signal of the 21 GHz-band satellite broadcasting are also satellites. If an attempt is made to enable transmission from the broadcast receiving apparatus 1 to the receiver 4, it is necessary to newly prepare a broadband connection cable 3.

  However, the input part of a general receiver is an F-type coaxial connector having an impedance of 75 ohms. If an attempt is made to configure a connection cable for impedance matching with a coaxial cable, the loss of the coaxial cable increases as the frequency increases. Therefore, it is difficult to make the input frequency of the connection cable correspond to 10 MHz to 4500 MHz. Therefore, it is assumed that an optical cable made of an optical fiber is used as the connection cable. However, there is a problem that a connection cable composed of a coaxial cable provided in existing equipment cannot be used.

  Even if an attempt is made to avoid the above-described problem and to configure a satellite broadcast receiving system by applying the technique of Patent Document 3, a satellite broadcast signal of a high frequency such as 12 GHz band or 21 GHz band is It is necessary to convert the signal into a signal, and an expensive laser is required. Also, as shown in Non-Patent Document 2, it is necessary to newly install a modulator or the like to correspond to an optical fiber that can transmit only up to several GHz. Furthermore, if it is configured to be able to transmit a plurality of types of signals from the satellite broadcast receiving apparatus 1 to the receiver 4, the same number of frequency converters as the number of distributions is required, resulting in high cost.

  Therefore, it is possible to reduce the manufacturing cost of the satellite broadcast receiver 1 and the burden of quality control thereof, and to use a cable having the same specification as a connection cable (a coaxial cable or an optical cable) of an existing facility. A highly practical device configuration that enables the use of connection cables provided in equipment is desired.

  In view of the above problems, an object of the present invention is to provide a satellite broadcast receiving apparatus that performs frequency conversion on a satellite broadcast signal obtained via a predetermined receiving antenna apparatus and transmits the signal to a receiver in a highly practical manner. To provide.

A satellite broadcast receiving apparatus according to one aspect of the present invention is a satellite broadcast receiving apparatus that performs frequency conversion on a satellite broadcast signal obtained via a predetermined receiving antenna apparatus and outputs the signal, wherein a signal having a first local oscillation frequency is provided. , A second local oscillator for outputting a signal of a second local oscillation frequency, and a satellite of a first polarization in a predetermined band obtained via a predetermined receiving antenna device. First pre-frequency conversion means for performing frequency conversion on a broadcast signal using one of the first local oscillation frequency signal and the second local oscillation frequency signal; and the first pre-frequency The frequency-converted signal obtained from the conversion means is subjected to frequency conversion using the other of the signal of the first local oscillation frequency and the signal of the second local oscillation frequency, and a first intermediate frequency signal to generate a And 1 of the subsequent stage frequency conversion means, and a second front stage frequency conversion means for performing frequency conversion to the second polarization satellite signal within the predetermined band using the signal of the second local oscillator frequency, wherein the A second post-frequency conversion means for performing frequency conversion on the frequency-converted signal obtained from the second pre-frequency conversion means using the signal of the second local oscillation frequency to generate a second intermediate frequency signal; A multiplexer for multiplexing the first intermediate frequency signal and the second intermediate frequency signal to generate an intermediate frequency signal for output , wherein the predetermined band is for broadcasting in the 12 GHz band. It is a predetermined broadcasting frequency band of 21 GHz band higher than the frequency band, and the band of the intermediate frequency signal for output of the broadcasting frequency band of 12 GHz band has a specified value standardized for each polarization, The first station The oscillation frequency has a specified value of 10.678 GHz, the second local oscillation frequency has a specified value of 9.505 GHz, and the first local oscillation frequency is 1.173 GHz higher than the second local oscillation frequency. Thereby, for each polarization, the band of the output intermediate frequency signal of the predetermined band is located within the band of the output intermediate frequency signal of the 12 GHz band broadcast frequency band. I do.

Furthermore, a satellite broadcast receiving apparatus according to another aspect of the present invention is a satellite broadcast receiving apparatus that performs frequency conversion on a satellite broadcast signal obtained via a predetermined receiving antenna apparatus and outputs the signal, wherein the first local oscillation frequency A first local oscillator for outputting a signal of a second local oscillation frequency, a second local oscillator for outputting a signal of a second local oscillation frequency, and a first local oscillator in a first band obtained through a predetermined receiving antenna device. First frequency conversion means for performing frequency conversion on a satellite broadcast signal of a wave using the signal of the first local oscillation frequency to generate an intermediate frequency signal of the first polarization; A second frequency conversion means for performing frequency conversion on a second polarization satellite broadcast signal using the signal of the second local oscillation frequency to generate an intermediate frequency signal of the second polarization; Polarized intermediate frequency signal and the second polarized wave A first multiplexer for multiplexing the intermediate frequency signal to generate an intermediate frequency signal for the first output, and a third polarization in a second band obtained through the predetermined receiving antenna device. First pre-stage frequency conversion means for performing frequency conversion on a satellite broadcast signal using one of the first local oscillation frequency signal and the second local oscillation frequency signal, and the first pre-stage The frequency-converted signal obtained from the frequency conversion means is subjected to frequency conversion using the other of the signal of the first local oscillation frequency and the signal of the second local oscillation frequency, and the third polarization is obtained. A first post-frequency conversion means for generating an intermediate frequency signal, and a second frequency conversion means for performing frequency conversion on a fourth polarization satellite broadcast signal in the second band using the signal of the second local oscillation frequency. And a second stage frequency conversion means. Performs frequency conversion using the signal of the second local oscillation frequency on the signal after the frequency conversion obtained from the frequency conversion means, and a second subsequent stage frequency conversion means for generating an intermediate frequency signal of said fourth polarization A second multiplexer that multiplexes the intermediate frequency signal of the third polarization and the intermediate frequency signal of the fourth polarization to generate an intermediate frequency signal for a second output , The second band is a predetermined broadcast frequency band of 21 GHz higher than the first band, which is a broadcast frequency band of 12 GHz, and an intermediate frequency for output of the broadcast frequency band of the first band. The signal band has a specified value standardized for each polarization, the first local oscillation frequency is 10.678 GHz as a specified value, and the second local oscillation frequency is 9.505 GHz as a specified value. First local oscillation frequency Is increased by 1.173 GHz from the second local oscillation frequency so that, for each polarization, the band of the second output intermediate frequency signal of the second band becomes the first output of the first band. In the band of the intermediate frequency signal for use .

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing cost of a satellite broadcast receiver can be reduced, and the burden of quality control can be reduced, and the thing of the same specification as the connection cable (coaxial cable or optical cable) of the existing equipment can be used. From this point, the system cost can be reduced and the burden of quality control can be reduced. In addition, preferably, a connection cable provided in existing equipment can be used, so that a satellite broadcast receiving device having a highly practical device configuration can be provided.

FIG. 1 is a block diagram illustrating a schematic configuration of a satellite broadcast receiving device according to a first embodiment of the present invention and a satellite broadcast receiving antenna device according to the first embodiment. FIG. 6 is a block diagram illustrating a schematic configuration of a satellite broadcast receiving device according to a second embodiment of the present invention and a satellite broadcast receiving antenna device according to the second embodiment. FIG. 10 is a block diagram illustrating a schematic configuration of a satellite broadcast receiving device according to a third embodiment of the present invention and a satellite broadcast receiving antenna device according to the third embodiment. FIG. 14 is a block diagram illustrating a schematic configuration of a satellite broadcast receiving device according to a fourth embodiment of the present invention and a satellite broadcast receiving antenna device according to the fourth embodiment. (A), (b) is a figure which shows the input-output relationship of the frequency conversion in the satellite broadcast receiver of 4th Embodiment by this invention, respectively. It is a figure showing the frequency relation of the output signal in the satellite broadcasting receiver of a 4th embodiment by the present invention. It is a block diagram showing a schematic structure of a conventional satellite broadcast receiving system. It is a figure which shows the frequency relationship of the terrestrial TV, the cable television, the right-handed IF of 12 GHz-band satellite broadcasting (BS / CS), and the left-handed IF in the conventional satellite broadcast receiving system. It is a block diagram which shows the schematic structure of the receiving antenna apparatus for satellite broadcasting in a satellite broadcasting receiving system based on a conventional technique, and a satellite broadcasting receiving apparatus.

  Hereinafter, a satellite broadcast receiving apparatus 1 according to each embodiment of the present invention will be described with reference to the drawings. It should be noted that the satellite broadcast receiving system including the satellite broadcast receiving apparatus 1 of each embodiment according to the present invention can be configured almost in the same manner as the satellite broadcast receiving system shown in FIG. Is attached.

  That is, also in the satellite broadcast receiving system according to the present invention, referring to FIG. 7, mainly the satellite broadcast receiving device 1, the satellite broadcast receiving antenna device 2, the connection cable 3, and the reception cable according to the present invention are described. Machine 4. The satellite broadcast receiving antenna device 2 may be any device that receives a satellite broadcast wave including the 21 GHz band and outputs a signal of the broadcast frequency as a satellite broadcast signal. For example, a 12 GHz band disclosed in Patent Document 2 It is also possible to use a satellite broadcast receiving antenna device which enables simultaneous reception of satellite broadcasting (BS / CS) and satellite broadcasting in the 21 GHz band. In the satellite broadcast receiving antenna device 2, a probe signal line 2a is usually provided integrally with a power supply unit for receiving and supplying a satellite broadcast wave, and the probe signal line 2a is connected to the broadcast frequency of the satellite broadcast wave via the probe signal line 2a. A corresponding satellite broadcast signal is output from the satellite broadcast receiving antenna device 2 to the satellite broadcast receiving device 1.

  The satellite broadcast receiving apparatus 1 of each embodiment according to the present invention converts the broadcast frequency of the input satellite broadcast signal into an intermediate frequency (IF), and converts the converted signal (IF signal) with a coaxial cable or the like. The signal is output to a receiver 4 such as a television receiver arranged in the house via a connection cable 3 having the same specification as that for satellite broadcasting in the 12 GHz band. Then, the receiver 4 makes the satellite broadcast viewable. Hereinafter, the satellite broadcast receiver 1 of each embodiment will be described in detail.

  At this time, a 21 GHz band (21.4 GHz to 22.0 GHz) broadcasting frequency band is assigned for satellite broadcasting, but only right-handed circular polarization or only left-handed circular polarization is used. It is not specified whether or not the right-handed and left-handed circularly polarized waves are shared, and furthermore, the assignment of the intermediate frequency and the local oscillation frequency of these right-handed and left-handed circularly polarized waves is not specified. For this reason, in the satellite broadcast receiving apparatus 1 of each embodiment according to the present invention, a preferred example regarding the assignment of the intermediate frequency and the local oscillation frequency in each polarization use mode is presented.

[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a satellite broadcast receiving apparatus 1 according to a first embodiment of the present invention and a satellite broadcast receiving antenna apparatus 2 according to the first embodiment. The satellite broadcast receiving antenna device 2 receives the 21 GHz band satellite broadcast wave by the frequency extracting unit 21 and extracts either the right-handed or left-handed circularly polarized broadcasting frequency 21.4 to 22.0 GHz. Then, the polarization separation section 22 separates the extracted broadcast frequency polarization (either right-handed or left-handed circularly polarized) into a satellite broadcast signal and outputs the satellite broadcast signal to the satellite broadcast receiver 1.

  The satellite broadcast receiving apparatus 1 according to the present embodiment has a 1217 band with respect to a broadcast frequency (21.4 GHz to 22.0 GHz) of a 21 GHz band satellite broadcast signal obtained from one of right-handed and left-handed circularly polarized waves. A first local oscillator 13, a second local oscillator 14, a first pre-stage frequency converter 17a, and a first post-stage frequency converter. 17b, and a mixer 16.

  The first front-stage frequency conversion unit 17a uses the local oscillation frequency 9.505 GHz from the second local oscillator 14 to convert either the right-handed or left-handed circularly polarized satellite broadcast signal (21.4 GHz to 22.0 GHz). The signal is converted into a first-stage IF signal (11.895 GHz to 12.495 GHz) and output to the first second-stage frequency converter 17b.

  The first post-stage frequency conversion unit 17b converts the pre-stage IF signal (11.895 GHz to 12.495 GHz) into the post-stage IF signal (1217-1817 MHz) using the local oscillation frequency 10.678 GHz from the first local oscillator 13. Output to the mixer 16.

  The mixer 16 mixes a terrestrial TV or cable TV signal input from a dedicated input terminal with a post-stage IF signal in the 21 GHz band satellite broadcast, and uses a single connection cable 3 to connect the receiver to the receiver. Transmit to 4 In general, a filter or an amplifier is mounted on the first front-stage frequency converter 17a and the first rear-stage frequency converter 17b, but these are not shown.

  Here, the mixer 16 does not necessarily need to be provided, and is configured to transmit the post-stage IF signal (1217-1817 MHz) output from the first post-stage frequency conversion unit 17b to the receiver 4 via the single connection cable 3. It may be.

  Further, the local oscillation frequencies from the first and second local oscillators 13 and 14 used in the first pre-stage frequency converter 17a and the first post-stage frequency converter 17b may be exchanged. (1217-1817 MHz).

  By the way, if the 21 GHz band (21.4 GHz to 22.0 GHz) satellite broadcast frequency obtained from either the right-handed or left-handed circularly polarized wave is one step from the intermediate frequency of 1217 to 1817 MHz. Therefore, a local oscillator for generating a signal having a local oscillation frequency dedicated to satellite broadcasting in the 21 GHz band must be provided. As a result, the manufacturing cost of the satellite broadcasting receiving apparatus configured as described above is reduced. And the burden of quality control will also increase.

  On the other hand, according to the satellite broadcast receiving apparatus 1 of the present embodiment, two-stage frequency conversion is performed when receiving a 21 GHz band satellite broadcast, and both the first and second local oscillators 13 and 14 are shown in FIG. The same specifications as those used for generating the right-handed IF signal and the left-handed IF signal in 12 GHz band satellite broadcasting (BS / CS) can be used. The cost can be reduced and the burden of quality control can be reduced.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, when receiving the 21 GHz band satellite broadcast, the same specification as the connection cable (coaxial cable or optical cable) of the existing equipment for the 12 GHz band satellite broadcast (BS / CS) is used. Can be used, the system cost can be reduced from this point, and the burden of quality control can be reduced.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, the connection cable 3 provided in the existing equipment for the satellite broadcast (BS / CS) of the 12 GHz band can be used for receiving the satellite broadcast of the 21 GHz band. Become.

  Therefore, according to the satellite broadcast receiving device 1 of the present embodiment, the device configuration has high practicality.

[Second embodiment]
FIG. 2 is a block diagram showing a schematic configuration of a satellite broadcast receiving apparatus 1 according to a second embodiment of the present invention and a satellite broadcast receiving antenna apparatus 2 according to the second embodiment. The satellite broadcast receiving antenna device 2 receives the 21 GHz band satellite broadcast wave by the frequency extracting unit 21 and extracts either the right-handed or left-handed circularly polarized broadcasting frequency 21.4 to 22.0 GHz. Then, the polarization separation section 22 separates the extracted broadcast frequency polarization (either right-handed or left-handed circularly polarized) into a satellite broadcast signal and outputs the satellite broadcast signal to the satellite broadcast receiver 1.

  The satellite broadcast receiving apparatus 1 according to the present embodiment has a frequency of 2390 with respect to the broadcast frequency (21.4 GHz to 22.0 GHz) of a 21 GHz band satellite broadcast signal obtained from one of the right-handed and left-handed circularly polarized waves. A second local oscillator 14, a second pre-stage frequency converter 18a, a second post-stage frequency converter 18b, and a mixer 16 Is provided.

  The second front-stage frequency conversion unit 18a uses the local oscillation frequency 9.505 GHz from the second local oscillator 14 to convert either the right-handed or left-handed circularly polarized satellite broadcast signal (21.4 GHz to 22.0 GHz). The signal is converted into a first-stage IF signal (11.895 GHz to 12.495 GHz) and output to the second second-stage frequency converter 18b.

  The second post-stage frequency conversion unit 18b converts the pre-stage IF signal (11.895 GHz to 12.495 GHz) into the post-stage IF signal (2390 to 2990 MHz) using the local oscillation frequency 9.505 GHz from the second local oscillator 14. Output to the mixer 16.

  The mixer 16 mixes a terrestrial TV or cable TV signal input from a dedicated input terminal with a post-stage IF signal in the 21 GHz band satellite broadcast, and uses a single connection cable 3 to connect the receiver to the receiver. Transmit to 4 In general, a filter and an amplifier are mounted on the second front-stage frequency converter 18a and the second rear-stage frequency converter 18b, but they are not shown.

  Here, the mixer 16 does not necessarily need to be provided, and is configured to transmit the second-stage IF signal (2390 to 2990 MHz) output from the second first-stage frequency converter 17b to the receiver 4 via the single connection cable 3. It may be.

  By the way, as described above, if the broadcast frequency of the satellite broadcast in the 21 GHz band (21.4 GHz to 22.0 GHz) obtained from one of the right-handed and left-handed circularly polarized waves is 2390 to 2990 MHz, as shown in FIG. If one-stage frequency conversion is performed up to the intermediate frequency, a local oscillator for generating a signal having a local oscillation frequency dedicated to satellite broadcasting in the 21 GHz band must be provided. The manufacturing cost of the device increases, and the burden of quality control increases.

  On the other hand, according to the satellite broadcast receiving apparatus 1 of the present embodiment, two-stage frequency conversion is performed when receiving a 21 GHz band satellite broadcast, and the second local oscillator 14 is configured to control the 12 GHz band satellite broadcast (BS) shown in FIG. The same specifications as those used for generating the left-handed IF signal in CS) can be used, and from the viewpoint of diversion, the manufacturing cost of the satellite broadcast receiver 1 is reduced and the burden of quality control is reduced. Can be done.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, when receiving the 21 GHz band satellite broadcast, the same specification as the connection cable (coaxial cable or optical cable) of the existing equipment for the 12 GHz band satellite broadcast (BS / CS) is used. Can be used, the system cost can be reduced from this point, and the burden of quality control can be reduced.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, the connection cable 3 provided in the existing equipment for the satellite broadcast (BS / CS) of the 12 GHz band can be used for receiving the satellite broadcast of the 21 GHz band. Become.

  Therefore, according to the satellite broadcast receiving device 1 of the present embodiment, the device configuration has high practicality.

[Third embodiment]
FIG. 3 is a block diagram showing a schematic configuration of a satellite broadcast receiving device 1 according to a third embodiment of the present invention and a satellite broadcast receiving antenna device 2 according to the third embodiment. The satellite broadcast receiving antenna device 2 receives the 21 GHz band satellite broadcast wave by the frequency extracting unit 21 to extract both the right-handed and left-handed circularly polarized broadcasting frequencies 21.4 to 22.0 GHz, The satellite broadcast signal obtained by separating each polarization (right-handed and left-handed circularly polarized waves) of the extracted broadcast frequency by the wave separator 22 is output to the satellite broadcast receiver 1.

  The satellite broadcast receiving apparatus 1 according to the present embodiment is configured such that the right-handed and right-handed and left-handed circularly polarized waves are used for the broadcast frequency (21.4 GHz to 22.0 GHz) of the satellite broadcast signal in the 21 GHz band. A device that functions as a converter that performs two-stage frequency conversion from 1217 to 1817 MHz and 2390 to 2990 MHz as the respective intermediate frequencies of left-handed circularly polarized waves, and multiplexes and outputs signals of the respective polarized waves after the frequency conversion. Yes, the first local oscillator 13, the second local oscillator 14, the first pre-stage frequency converter 17a, the first post-stage frequency converter 17b, the second pre-stage frequency converter 18a, the second post-stage frequency converter 18b, and the multiplexer 19 is provided.

  The first front-stage frequency conversion unit 17a uses the local oscillation frequency 9.505 GHz from the second local oscillator 14 to convert a right-handed circularly polarized satellite broadcast signal (21.4 GHz to 22.0 GHz) into a front-stage IF signal (11. 895 GHz to 12.495 GHz) and outputs it to the first post-stage frequency conversion unit 17b.

  The first post-stage frequency conversion unit 17b converts the pre-stage IF signal (11.895 GHz to 12.495 GHz) into the post-stage IF signal (1217-1817 MHz) using the local oscillation frequency 10.678 GHz from the first local oscillator 13. Output to the multiplexer 19.

  The second front-stage frequency converter 18a converts the left-hand circularly polarized satellite broadcast signal (21.4 GHz to 22.0 GHz) using the local oscillation frequency 9.505 GHz from the second local oscillator 14 into a front-stage IF signal (11.895 GHz). 〜12.495 GHz) and outputs it to the second post-stage frequency converter 18b.

  The second post-stage frequency conversion unit 18b converts the pre-stage IF signal (11.895 GHz to 12.495 GHz) into the post-stage IF signal (2390 to 2990 MHz) using the local oscillation frequency 9.505 GHz from the second local oscillator 14. Output to the multiplexer 19.

  The multiplexer 19 includes a post-stage IF signal obtained from the first post-stage frequency conversion unit 17b (ie, a 21 GHz band satellite broadcast right-handed IF signal) and a post-stage IF signal obtained from the second post-stage frequency conversion unit 18b (ie, 21 GHz). A signal multiplexed with the band-broadcast satellite broadcasting left-handed IF signal is generated and transmitted to the receiver 4 via the single connection cable 3.

  However, the mixer 16 may be provided after the multiplexer 19. The mixer 16 mixes a terrestrial TV or cable television signal input from a dedicated input terminal (not shown) with an output signal of the multiplexer 19 in the 21 GHz band satellite broadcast, and forms a single signal. The connection cable 3 can be configured to transmit the signal to the receiver 4.

  Further, the local oscillation frequencies from the first and second local oscillators 13 and 14 used for right-handed and left-handed circularly polarized waves, respectively, may be exchanged. Can be generated as described above for the IF signal of each polarization.

  In general, a filter or an amplifier is mounted on the first pre-stage frequency converter 17a, the first post-stage frequency converter 17b, the second pre-stage frequency converter 18a, and the second post-stage frequency converter 18b. Its illustration is omitted.

  By the way, as described above, if the broadcast frequency (21.4 GHz to 22.0 GHz) of the 21 GHz band satellite broadcast signal obtained from both the right-handed and left-handed circularly polarized waves is 1217 to 1817 MHz, and If one-stage frequency conversion is performed to an intermediate frequency of 2390 to 2990 MHz, a local oscillator for generating a signal of a local oscillation frequency dedicated to satellite broadcasting in the 21 GHz band must be provided. As a result, such a configuration is required. The manufacturing cost of such a satellite broadcast receiver increases, and the burden of quality control increases.

  On the other hand, according to the satellite broadcast receiving apparatus 1 of the present embodiment, two-stage frequency conversion is performed when receiving a 21 GHz band satellite broadcast, and the first local oscillator 13 and the second local oscillator 14 are set to 12 GHz shown in FIG. The same specifications as those used for the generation of the right-handed and left-handed IF signals in the satellite broadcasting (BS / CS) of the band can be used, and the manufacturing cost of the satellite broadcasting receiver 1 can be reduced from the viewpoint of applicability. In addition, the burden of quality control can be reduced.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, when receiving the 21 GHz band satellite broadcast, the same specification as the connection cable (coaxial cable or optical cable) of the existing equipment for the 12 GHz band satellite broadcast (BS / CS) is used. Can be used, the system cost can be reduced from this point, and the burden of quality control can be reduced.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, the connection cable 3 provided in the existing equipment for the satellite broadcast (BS / CS) of the 12 GHz band can be used for receiving the satellite broadcast of the 21 GHz band. Become.

  Therefore, according to the satellite broadcast receiving device 1 of the present embodiment, the device configuration has high practicality.

[Fourth embodiment]
FIG. 4 is a block diagram showing a schematic configuration of a satellite broadcast receiving device 1 according to a fourth embodiment of the present invention and a satellite broadcast receiving antenna device 2 according to the fourth embodiment. The receiving antenna device 2 for satellite broadcasting receives the 12 GHz band and 21 GHz band satellite broadcasting waves at the same time by the frequency separating unit 21 a to separate the bands, and performs right-handed and left-handed circularly polarized waves in the respective bands of the 12 GHz band and the 21 GHz band. , And the polarization separators 22 and 23 separate the respective polarized waves (right-handed and left-handed circularly polarized waves) of the extracted broadcast frequency in each of the 12 GHz band and the 21 GHz band. The received satellite broadcast signal is output to the satellite broadcast receiver 1.

  As such a satellite broadcast receiving antenna device 2, for example, satellite broadcast reception that enables simultaneous reception of a 12 GHz band satellite broadcast (BS / CS) and a 21 GHz band satellite broadcast disclosed in Patent Document 2 An antenna device can also be used. However, the frequency separation method may have a configuration other than the structure in which the frequency separation is performed by stacking as disclosed in Patent Document 2. As for the method of polarization separation, there are a method using a hybrid circuit and a method using a phase difference plate. Since the configuration of the satellite broadcast receiving antenna apparatus 2 is not directly related to the gist of the present invention, it is not necessary to limit the method of frequency separation and polarization separation to a specific technique.

  The satellite broadcast receiving apparatus 1 of the present embodiment combines the configuration based on the conventional technique shown in FIG. 9 with the configuration of the third embodiment shown in FIG. 3 to provide a satellite broadcast (BS / CS) in the 12 GHz band and a 21 GHz band. Satellite broadcasting signals of each polarization (right-handed and left-handed circularly polarized waves) in each band of the satellite broadcasting of the above-mentioned satellite broadcasting are simultaneously received, and the satellite broadcasting of the 12-GHz band (BS / CS) and the intermediate frequencies of the satellite broadcasting of the 21-GHz band are transmitted. A first frequency converter 11, a second frequency converter 12, a first local oscillator 13, a second local oscillator 14, a multiplexer 15, a mixer A frequency converter 16, a first pre-stage frequency converter 17 a, a first post-stage frequency converter 17 b, a second pre-stage frequency converter 18 a, a second post-stage frequency converter 18 b, and a multiplexer 19.

  The first frequency converter 11, the second frequency converter 12, the first local oscillator 13, the second local oscillator 14, the multiplexer 15, and the mixer 16, as described with reference to FIG. Using the local oscillation frequency 10.678 GHz from the local oscillator 13 and the local oscillation frequency 9.505 GHz from the second local oscillator 14, the 12 GHz band right-handed and left-handed circularly polarized satellite broadcast signals are clockwise and left-handed, respectively. The signal is converted into a circularly polarized IF signal, and a combined signal is generated. The signal is mixed with a terrestrial TV or cable TV signal input from an input terminal provided exclusively for the receiver 4 as an “output 1”. Transmit to. In addition, the mixer 16 does not necessarily need to be provided.

  As described with reference to FIG. 3, the first pre-stage frequency conversion unit 17a, the first post-stage frequency conversion unit 17b, the second pre-stage frequency conversion unit 18a, the second post-stage frequency conversion unit 18b, and the multiplexer 19 are Using a local oscillation frequency of 10.678 GHz from the first local oscillator 13 and a local oscillation frequency of 9.505 GHz from the second local oscillator, through two-stage frequency conversion, right-handed and left-handed circularly polarized waves in the 21 GHz band Is converted into right-handed and left-handed circularly polarized IF signals to generate a combined signal, and is transmitted to the receiver 4 as "output 2".

  It is to be noted that a filter or an amplifier is generally mounted on each frequency converter, but is not shown.

  In the present embodiment, as shown in FIG. 4, a single first local oscillator 13 and a single second local oscillator 14, which are configured in common, provide 12 GHz band satellite broadcasting (BS / CS) and 21 GHz An IF signal based on each intermediate frequency of the satellite broadcasting of the band can be generated. This can reduce the manufacturing cost of the satellite broadcast receiving device 1 and the burden of quality control of the satellite broadcast receiving device 1 from the viewpoint of commonality, and further reduce the size of the satellite broadcast receiving device 1 and increase the circuit scale. It is possible to obtain the effect of avoidance, reduction of the manufacturing cost associated with this, and reduction of the burden of quality control.

  However, the first local oscillator 13 and the second local oscillator 14 may be separately provided for the IF signals based on the intermediate frequencies of the satellite broadcasting (BS / CS) in the 12 GHz band and the satellite broadcasting in the 21 GHz band, respectively. The same effects as in the third embodiment can be obtained. That is, from the viewpoint of diversion of the first local oscillator 13 and the second local oscillator 14, it is possible to reduce the manufacturing cost of the satellite broadcast receiver 1 and the burden of quality control thereof.

  FIG. 5A shows the right-handed and left-handed circularly polarized broadcast frequencies in the 12-GHz band satellite broadcasting in the satellite broadcast receiving apparatus 1 of the present embodiment, and conversion into IF signals from the right-handed and left-handed circularly polarized waves, respectively. 2 shows the input / output relationship of the frequency conversion in which the local oscillation frequency used for the conversion and the frequency of each IF signal obtained as “output 1” are summarized.

  FIG. 5B shows the satellite broadcast receiving apparatus 1 of the present embodiment for converting each of the right-handed and left-handed circularly polarized broadcasting frequencies and the right-handed and left-handed circularly polarized IF signals in the 21 GHz band satellite broadcasting. , The local oscillation frequency of the preceding stage in the two-stage frequency conversion, the output frequency of the preceding stage after the frequency conversion, the local oscillation frequency of the subsequent stage in the two-stage frequency conversion, and the respective IF signals obtained as “output 2” 2 shows the input / output relationship of the frequency conversion summarized for the frequencies of FIG.

  FIG. 6 shows a frequency relationship of an output signal in the satellite broadcast receiving device 1 of the present embodiment. It can be seen that the output frequencies after the frequency conversion of the 21 GHz band satellite broadcasting (21 GHz band right rotation IF, 21 GHz band left rotation IF) are included in the frequency band of the 12 GHz band satellite broadcasting IF. The input / output relationship of the frequency conversion and the frequency relationship of the output signal shown in FIGS. 5B and 6 have the same relationship in the above-described first to third embodiments.

  By the way, also in the present embodiment, the local oscillation frequencies from the first and second local oscillators 13 and 14 used for right-handed and left-handed circularly polarized waves may be exchanged. Can generate a signal multiplexed as described above with respect to the IF signal of each polarization of the 21 GHz band satellite broadcast.

  According to the satellite broadcast receiving apparatus 1 of the present embodiment, when receiving a 21 GHz band satellite broadcast, the connection cable (coaxial cable or optical cable) of the existing equipment for the 12 GHz band satellite broadcast (BS / CS) has the same specifications. Can be used, the system cost can be reduced from this point, and the burden of quality control can be reduced.

  Further, according to the satellite broadcast receiving apparatus 1 of the present embodiment, the connection cable 3 provided in the existing equipment for the satellite broadcast (BS / CS) of the 12 GHz band can be used for receiving the satellite broadcast of the 21 GHz band. Become.

  Therefore, according to the satellite broadcast receiving apparatus 1 of the present embodiment, even if it is configured to simultaneously receive the 12 GHz band satellite broadcast and the 21 GHz band satellite broadcast, the satellite broadcast receiving apparatus 1 is configured using only the existing (for 12 GHz band satellite broadcast) local oscillator. However, since it is not necessary to add a local oscillator having a new local oscillation frequency, it is possible to reduce the cost and the circuit size, and furthermore, it is necessary to transmit IF signals related to 21 GHz band satellite broadcasting in the frequency band of the existing satellite broadcasting IF. Since the signal can be transmitted to the receiver 4, a highly practical device configuration is obtained.

  By the way, in the satellite broadcast receiving apparatus 1 of the present embodiment, the frequency band of the 21 GHz band satellite broadcast IF of “output 2” overlaps with the existing 12 GHz band satellite broadcast IF of “output 1”. If any of the following methods is used as the connection cable 3, the signal can be transmitted to the receiver 4.

(1) The 21 GHz band satellite broadcasting IF signal is transmitted by a connection cable (coaxial cable or optical cable) of the same specification provided separately from the connection cable 3 used in the existing broadcasting (terrestrial TV, 12 GHz band satellite broadcasting, etc.). . In this case, one connecting cable (coaxial cable or optical cable) is added, but the existing connecting cable 3 can also be used.
(2) Instead of using the connection cable 3 used in the existing broadcasting (terrestrial TV, 12 GHz band satellite broadcasting, etc.), the existing broadcasting (terrestrial TV, 12 GHz band, 12 GHz band, etc.) is And 21 GHz band satellite broadcast IF signals. In this case, when the existing connection cable 3 is an optical cable composed of a coaxial cable or a single-core optical fiber, it is replaced with a single optical cable composed of a multi-core optical fiber. And IF signals of cable television, 12 GHz band satellite broadcasting, and 21 GHz band satellite broadcasting can be transmitted. When the existing connection cable 3 is composed of one optical cable composed of multi-core optical fibers, the existing connection cable 3 can be used.
(3) Use a laser beam with a wavelength of 1550 nm (based on ARIB STD-B63) for existing broadcasting (such as terrestrial TV and 12 GHz band satellite broadcasting), and use a wavelength other than 1550 nm for a 21 GHz band satellite broadcasting IF signal. If the existing connection cable 3 is formed of an optical cable, it can be used without being added. If the existing connection cable 3 is formed of a coaxial cable, it can be replaced with one optical cable. With this optical cable, it is possible to transmit IF signals for terrestrial TV, cable television, 12 GHz band satellite broadcasting, and 21 GHz band satellite broadcasting, regardless of whether they are single-core or multi-core optical fibers.
(4) A selector capable of selecting “output 1” or “output 2” is provided in the satellite broadcast receiving apparatus 1 of the present embodiment, and this is used for existing broadcasting (such as terrestrial TV and 12 GHz band satellite broadcasting). The bidirectional communication control is performed using the connection cable 3 (coaxial cable or optical cable), and the output is selected. Such a selector is provided, for example, in FIG. 4 so that the output of the mixer 16 and the multiplexer 19 can be selected, or can be a frequency conversion block for 12 GHz band satellite broadcasting and 21 GHz band satellite broadcasting, or an entire functional unit. Can be provided to be selectable.

  As described above, the present invention has been described with the example of the specific embodiment. However, the present invention is not limited to the above-described example, and can be variously modified without departing from the technical idea thereof. For example, in the above-described example, the satellite broadcast receiving antenna device 2 and the satellite broadcast receiving device 1 are connected by the probe signal line 2a of the satellite broadcast receiving antenna device, and in effect, the satellite broadcast receiving antenna device 2 and the satellite broadcast receiving antenna device 2 are connected. Although the description has been made on the assumption that the receiving device 1 is integrated with the receiving device 1, the satellite broadcasting receiving device 1 is configured as an independent device with respect to the satellite broadcasting receiving antenna device 2, and the satellite broadcasting receiving antenna device 2 The satellite broadcasting receiver 1 and the satellite broadcasting receiver 1 may be connected by a dedicated line.

  ADVANTAGE OF THE INVENTION According to this invention, since it can be set as the satellite broadcast receiver of a highly practical apparatus structure, it is useful for the use of the converter which performs frequency conversion at the time of receiving 21-GHz-band satellite broadcast.

  More specifically, the frequency in satellite broadcasting can be effectively used, and can be applied to new broadcasting applications such as 8K Super Hi-Vision and 3D television. Since the converter can be configured without adding a local oscillator having a new local oscillation frequency and without expanding the intermediate frequency used for transmission, simultaneous reception of 12 GHz band satellite broadcasting and 21 GHz band satellite broadcasting can be achieved. Useful for applications.

DESCRIPTION OF SYMBOLS 1 Satellite broadcasting receiving apparatus 2 Satellite broadcasting receiving antenna apparatus 2a Probe signal line of satellite broadcasting receiving antenna apparatus 3 Connection cable (coaxial cable or optical cable)
Reference Signs List 4 receiver 11 first frequency converter 12 second frequency converter 13 first local oscillator 14 second local oscillator 15 multiplexer 16 mixer 17a first pre-stage frequency converter 17b first post-stage frequency converter 18a second pre-stage Frequency conversion unit 18b Second post-stage frequency conversion unit 19 Multiplexer 21 Frequency extraction unit 21a Frequency separation unit 22, 23 Polarization separation unit

Claims (2)

A satellite broadcast receiving apparatus that performs frequency conversion on a satellite broadcast signal obtained via a predetermined receiving antenna apparatus and outputs the result.
A first local oscillator for outputting a signal of a first local oscillation frequency;
A second local oscillator that outputs a signal of a second local oscillation frequency;
One of the signal of the first local oscillation frequency and the signal of the second local oscillation frequency is used for a first polarization satellite broadcast signal within a predetermined band obtained through a predetermined reception antenna device. First frequency conversion means for performing frequency conversion by
The frequency-converted signal obtained from the first pre-stage frequency conversion means is subjected to frequency conversion using the other of the signal of the first local oscillation frequency and the signal of the second local oscillation frequency, a first post-stage frequency conversion means for generating a first intermediate frequency signal,
Second pre-frequency conversion means for performing frequency conversion on a second polarization satellite broadcast signal within the predetermined band using the signal of the second local oscillation frequency;
A second post-stage frequency conversion for generating a second intermediate frequency signal by subjecting the frequency-converted signal obtained from the second pre-stage frequency conversion means to frequency conversion using the signal of the second local oscillation frequency; Means,
A multiplexer for multiplexing the first intermediate frequency signal and the second intermediate frequency signal to generate an intermediate frequency signal for output ;
The predetermined band is a predetermined broadcast frequency band of 21 GHz higher than the broadcast frequency band of 12 GHz,
The band of the intermediate frequency signal for output of the broadcast frequency band of the 12 GHz band has a specified value standardized for each polarization,
The first local oscillation frequency has a specified value of 10.678 GHz, the second local oscillation frequency has a specified value of 9.505 GHz, and the first local oscillation frequency is set at 1.50 GHz higher than the second local oscillation frequency. By increasing the frequency by 173 GHz, for each polarization, the band of the output intermediate frequency signal in the predetermined band is positioned within the band of the output intermediate frequency signal in the 12 GHz band broadcast frequency band. satellite broadcasting receiver you characterized in that the. A satellite broadcast receiving apparatus that performs frequency conversion on a satellite broadcast signal obtained via a predetermined receiving antenna apparatus and outputs the result.
A first local oscillator for outputting a signal of a first local oscillation frequency;
A second local oscillator that outputs a signal of a second local oscillation frequency;
A frequency conversion is performed on a first polarization satellite broadcast signal in a first band obtained through a predetermined receiving antenna device using the signal of the first local oscillation frequency, and an intermediate frequency of the first polarization is obtained. First frequency conversion means for generating a signal;
A second frequency conversion for performing a frequency conversion on the second polarization satellite broadcast signal in the first band using the signal of the second local oscillation frequency to generate an intermediate frequency signal of the second polarization; Means,
A first multiplexer that multiplexes the intermediate frequency signal of the first polarization and the intermediate frequency signal of the second polarization to generate an intermediate frequency signal for a first output;
One of a signal of the first local oscillation frequency and a signal of the second local oscillation frequency with respect to a satellite broadcast signal of a third polarization in a second band obtained through the predetermined receiving antenna device A first pre-stage frequency conversion means for performing frequency conversion using
The frequency-converted signal obtained from the first pre-stage frequency conversion means is subjected to frequency conversion using the other of the signal of the first local oscillation frequency and the signal of the second local oscillation frequency, a first post-stage frequency conversion means for generating an intermediate frequency signal of the third polarization,
Second pre-frequency conversion means for performing frequency conversion on a fourth polarization satellite broadcast signal in the second band using the signal of the second local oscillation frequency;
A second frequency conversion section that performs frequency conversion on the frequency-converted signal obtained from the second pre-stage frequency conversion section using the signal of the second local oscillation frequency to generate an intermediate frequency signal of the fourth polarization . Post-frequency conversion means,
A second multiplexer that multiplexes the intermediate frequency signal of the third polarization and the intermediate frequency signal of the fourth polarization to generate an intermediate frequency signal for a second output ;
The second band is a predetermined broadcast frequency band of 21 GHz higher than the first band, which is a broadcast frequency band of 12 GHz,
The band of the intermediate frequency signal for output of the broadcast frequency band of the first band has a specified value standardized for each polarization,
The first local oscillation frequency has a specified value of 10.678 GHz, the second local oscillation frequency has a specified value of 9.505 GHz, and the first local oscillation frequency is set at 1.50 GHz higher than the second local oscillation frequency. By increasing the frequency by 173 GHz, the band of the intermediate frequency signal for the second output of the second band is located within the band of the intermediate frequency signal for the first output of the first band for each polarization. satellite broadcasting receiver characterized in that as.