JP2009267814A - Receiving system and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiving system and a vehicle for reducing a mounting space to the vehicle by reducing the number of antennas and the number of antenna elements. <P>SOLUTION: The receiving system includes a plurality of antennas 11, 12, 13, 14 for receiving a high frequency signal of a plurality of bands, a plurality of splitters 20, 30, 40, 50 for splitting signals from the plurality of antennas by band, a digital signal converting unit 121 for converting outputs from the splitters to respective digital signals, and a multiplexing processing unit 140 for multiplexing the digital signals from the digital signal converting unit, and the vehicle 4 includes such a receiving system. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a receiving system and a vehicle, and more particularly to a receiving system and a vehicle having a plurality of antennas for receiving high frequency signals in a plurality of bands.

  A plurality of broadcast media signals (for example, AM, FM, and digital TV) are received using a plurality of antennas, each of which is subjected to frequency conversion, and passed through a BPF (Band Pass Filter). It is known that only a signal is extracted, converted into a digital signal by an AD converter, multiplexed in a multiplexing processing unit, and the multiplexed signal is transmitted to a second processing unit that demodulates the signal through a cable. (For example, Patent Document 1).

International Publication WO 2007/058341 (FIG. 2)

  However, when the number of media to be received increases, the number of antennas increases, and there is a problem that it is difficult to secure a mounting space in the vehicle. In particular, when space diversity reception is used to improve reception characteristics, a larger number of antennas is required, and it is difficult to secure a space for mounting all antennas.

  In addition, when an antenna is used as an antenna element on the windshield surface of a vehicle, a connection point (feeding point) between the receiving circuit and each antenna element is required, but the connection between the receiving circuit and each connection point is required. Since a special terminal or the like is used, there is a problem that when the number of antenna elements increases, the number of feeding points increases, which increases the cost of the entire system.

  Accordingly, an object of the present invention is to provide a receiving system and a vehicle that can solve the above-mentioned problems.

  Another object of the present invention is to provide a receiving system and a vehicle that can reduce the mounting space on the vehicle by reducing the number of antennas (or the number of antenna elements).

  Another object of the present invention is to provide a receiving system and a vehicle that can reduce the number of antennas (or the number of antenna elements), thereby reducing the number of feeding points and reducing the cost.

  Furthermore, an object of the present invention is to provide a receiving system and a vehicle that can reduce the number of antennas (or the number of antenna elements) and minimize wiring for transmitting high-frequency signals.

  The receiving system according to the present invention includes a plurality of antennas capable of receiving high-frequency signals in a plurality of bands, a plurality of distributors for dividing the signals from the plurality of antennas for each band, and outputs from the distributors as digital signals, respectively. A digital signal conversion unit for converting the digital signal into a digital signal conversion unit; and a multiplexing processing unit for multiplexing the digital signal from the digital signal conversion unit.

  Further, the vehicle according to the present invention includes a plurality of antennas that receive high-frequency signals in a plurality of bands arranged on the windshield, a plurality of distributors that divide the signals from the plurality of antennas into each band, and a distributor A digital signal conversion unit for converting the output from the digital signal, a multiplexing processing unit for multiplexing the digital signal from the digital signal conversion unit, and a cable for transmitting the signal output from the multiplexing processing unit, And a demodulator for demodulating a signal received via a cable.

  According to the present invention, high frequency signals in a plurality of bands are received by a common antenna, so that the number of antennas (or the number of antenna elements) can be reduced, and the mounting space in the vehicle can be reduced. .

  Further, according to the present invention, high frequency signals in a plurality of bands are received by a common antenna, so that the number of antennas (or the number of antenna elements) can be reduced, the number of feeding points can be reduced, and the cost can be reduced. It has become possible.

  Furthermore, according to the present invention, since the high frequency signal is digitized and multiplexed and then transmitted to the demodulator, the wiring for transmitting the high frequency signal can be minimized, and the influence of pulse noise and high frequency noise can be reduced. It became possible to do.

  Hereinafter, a receiving system and a vehicle according to the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, but extends to the invention described in the claims and equivalents thereof.

  1a and 1b are block diagrams showing a schematic configuration of a receiving system according to the present invention. FIG. 1 a mainly shows the first processing unit 1, and FIG. 1 b mainly shows the second processing unit 3 corresponding to the first processing unit 1.

  The receiving system includes an antenna unit 10 composed of a plurality of antenna elements, a first processing unit 1 disposed in the vicinity of the antenna unit 10, and a second processing connected to the first processing unit 1 and the serial data transmission cable 2. It is composed of part 3 etc. and supports broadcast waves of AM broadcast band (522-1629 kHz), FM broadcast band (76-90 MHz), and digital TV (DTV) broadcast band (470-770 MHz) used in Japan. Is configured to do.

  The antenna unit 10 includes a first antenna element 11, a second antenna element 12, a third antenna element 13, a fourth antenna element 14, a first feeding point 15 to the first antenna element 11, and a second antenna element 12 to the second antenna element 12. The second feeding point 16, the third feeding point 17 to the third antenna element 13, the first feeding point 18 to the fourth antenna element 14, and the like.

  FIG. 2 is a diagram illustrating an example of an arrangement example of the antenna unit 10 or the like observed from the outside of the vehicle, and FIG. 3 illustrates an example of an arrangement example of the antenna unit 10 or the like observed from the inside of the vehicle. FIG.

  As shown in FIGS. 2 and 3, the first antenna element 11 to the fourth antenna element 14 are formed by evaporating a conductor on the rear glass 5 of the vehicle 4 from the inside of the vehicle 4. Note that a metal may be printed on the rear glass 5 of the vehicle 4 from the inside of the vehicle 4 and baked.

  In addition, spring-type contacts 19 are used to connect the feeding points 15 to 18 of the first antenna element 11 to the fourth antenna element 14 and the first processing unit 1. Further, the first processing unit 1 is attached to the vehicle 4 by a grounding / attachment fitting 6. Further, the first processing unit 1 is connected to a second processing unit 3 disposed at a predetermined position of the vehicle 4 by a serial data transmission cable 2.

  The lengths of the first antenna element 11 to the fourth antenna element 14 are all set to the same length (Acm), and the length A of each element corresponds to broadcast waves in the AM broadcast band, FM broadcast band, and DTV broadcast band. Is set to

  When the length A of the antenna element is set to a quarter wavelength or an odd multiple thereof with respect to the frequency near the center of the corresponding broadcast band, the broadcast wave can be satisfactorily received by resonance. For example, if the predetermined frequency of the DTV broadcast band is 600 MHz, the wavelength λ0 in free space is 50 cm, and the wavelength λr on the rear glass surface is λr = λ0 × εr / 2 (where εr≈4: relative dielectric constant of glass ) To 25 cm. Therefore, since 7 × λr / 4≈44 cm, it is possible to satisfactorily receive the DTV broadcast band by setting the length A of the antenna element to 44 cm.

  The antenna element set to 44 cm can also resonate with an 85.7 MHz broadcast wave corresponding to 1/7 of 600 MHz, so that an FM broadcast band centered on 85.7 MHz is also excellent. Can be received.

  Furthermore, in the AM broadcast band, an antenna element having a sufficient length with respect to the wavelength converted on the glass surface cannot be formed, so that it can be designed as an antenna having only the capacitive reactance of the antenna element.

  Therefore, for example, an antenna element set to 44 cm can satisfactorily receive broadcast waves in the DTV broadcast band, FM broadcast band, and AM broadcast band. The value of the length A of the antenna element described above is an example, and an optimum value can be selected according to various conditions. In addition, in FIG. 1a, FIG. 2 and FIG. 3, a linear antenna element is shown. However, the element shape is not limited to a linear shape, but may be bent or formed in a meander shape depending on the mounting convenience. You may let them.

  As shown in FIG. 1a, the first processing unit 1 includes a first distributor 20, a second distributor 30, a third distributor 40, a fourth distributor 50, a first high frequency amplifier 61 to a twelfth high frequency amplifier. 72, a first frequency converter 81, a fourth frequency converter 84, a ninth frequency converter 89, a twelfth frequency converter 92, a first BPF 101 to a 12BPF 112, a first AD converter 121 to a twelfth AD converter 132, and a multiplexer 70. And a serial data transmission unit 71 and the like.

  The first distributor 20, the second distributor 30, the third distributor 40, and the fourth distributor 50 convert the broadcast wave signals received by the antenna elements 11 to 14 into DTV signals, FM signals, and AM. It functions to divide it into signals for use.

  FIG. 4 is a diagram illustrating a specific configuration example of the first distributor 20, and FIG. 5 is a diagram illustrating an example of a frequency band that the circuits 21 to 23 of the first distributor 20 pass.

  The first distributor 20 includes an AM circuit 21 that functions as an LPF (Low Pass Filter) for dividing an AM signal (522 to 1629 kHz), and a BPF for dividing an FM signal (76 to 90 MHz). An FM circuit 22 that functions as a (Band Pass Filter), a DTV circuit 23 that functions as an HPF (High Pass Filter) for dividing a DTV signal (470 to 770 MHz), and the like.

  In addition, since the structure of the 2nd divider | distributor 30, the 3rd divider | distributor 40, and the 4th divider | distributor 50 is also the same as that of the 1st divider | distributor 20 shown in FIG. 4, the description is abbreviate | omitted.

  In the case of an AM signal, for example, the signal from the AM circuit 51 of the fourth distributor 50 is amplified by the third high-frequency amplifier 63 and the third BPF 103 having an AM pass bandwidth (522 to 1629 kHz) The high frequency signal passes through and is directly converted into a digital signal by the third AD converter 123. The same applies to the signals from the AM circuits 21, 31 and 41 of the first distributor 20 to the third distributor 30.

  In the case of an FM signal, for example, the signal from the FM circuit 52 of the fourth distributor 50 is amplified by the second high-frequency amplifier 62 and the second BPF 102 having an FM passband width (76 to 90 MHz) is supplied. The high frequency signal passes through and is directly converted into a digital signal by the second AD converter 122. The same applies to the signals from the FM circuits 22, 32, and 42 of the first distributor 20 to the third distributor 30.

  In the case of the DTV signal, for example, the signal from the DTV circuit 53 of the fourth distributor 50 is amplified by the first high frequency amplification unit 61 and is frequency-converted by the first frequency conversion unit 81 to become an intermediate frequency. For example, when the intermediate frequency is 50 MHz, the first BPF 101 having the passband width is converted into a digital signal by the first AD converter 121. The same applies to the signals from the DTV circuits 23, 33 and 43 of the first distributor 20 to the third distributor 30.

  The multiplexing unit 140 multiplexes the 12 digital signals output from the first AD converter 121 to the 12th AD converter 132 into a predetermined format and outputs the multiplexed signal to the serial data transmission unit 141. The multiplexed data multiplexed by the multiplexing unit 140 is parallel data in units of bits. The serial data sending unit 141 converts the multiplexed data from the multiplexing unit 140 into serial data and sends it to the cable 2.

  As shown in FIG. 1B, the second processing unit 3 includes a serial data receiving unit 150, a demultiplexing unit 151, an AM demodulation processing unit 152, an FM demodulation processing unit 153, a DTV demodulation processing unit 154, and the like. .

  The serial data receiving unit 150 receives serial data via the cable 2, converts it into parallel data, and outputs the parallel data to the demultiplexing unit 151. The demultiplexing unit 151 uses the same format as that of the multiplexing unit 140 to separate the signals into the original signal system and demodulate the AM system demodulated signals (third AD converter 123, sixth AD converter 126, seventh AD The FM demodulated signals (corresponding to digital signals from the converter 127 and the tenth AD converter 130) to the AM demodulation processing unit 152 (from the second AD converter 122, the fifth AD converter 125, the eighth AD converter 128, and the eleventh AD converter 131) DTV system demodulated signals (corresponding to digital signals from the first AD converter 121, the fourth AD converter 124, the ninth AD converter 129, and the twelfth AD converter 132) to the FM demodulation processing unit 153. The data is output to the demodulation processing unit 154.

  In the AM demodulation processing unit 152, the antenna elements are arranged too close to the AM wavelength and are inappropriate for performing the spatial diversity processing. Output as a demodulated signal.

  The FM demodulation processing unit 153 synthesizes two of the four demodulated signals for FM, performs spatial diversity processing by maximum ratio combining using the two synthesized signals, and performs optimal FM use Is output as an FM demodulated signal.

  The DTV demodulation processing unit 154 performs space diversity processing by maximum ratio combining using the four DTV demodulated signals, forms an optimum DTV signal, and outputs it as a DTV demodulated signal.

  The demodulated signal of each band processed in this way is output from a speaker mounted on the vehicle 4 as an audio signal and / or video signal of a desired channel in a desired band through further processing or the like. Or played on a display mounted on the vehicle 4.

  As described above, in the receiving system shown in FIGS. 1a and 1b, each of the four antenna elements 11 to 14 having the same length has a plurality of bands, that is, high frequencies of a DTV broadcast band, an FM broadcast band, and an AM broadcast band. Since the signal can be received, the antenna unit can be configured with a small space. For example, if four channels are required for DTV to perform spatial diversity processing, two channels for FM to perform spatial diversity processing, and one system for AM, at least seven signals are used in the past. Although the antenna element is necessary, the receiving system shown in FIGS. 1a and 1b is configured to use only four antenna elements 11 to 14 by using the antenna elements in a plurality of bands.

  In the receiving system shown in FIGS. 1a and 1b, a first processing unit 1 that converts a high-frequency signal into a digital signal and multiplexes the digital signal to generate serial data is disposed in the vicinity of the antenna unit 10. Serial data is transmitted by the cable 2 to the second processing unit 3 arranged at a predetermined position of the vehicle 4. Therefore, there is no need to route a plurality of high-frequency signals through the vehicle 4 with a plurality of cables, saving the amount of cables and space for arranging the cables, attenuation of high-frequency signals by transmitting the cables, and prevention of generation of high-frequency noise. There is also an advantage of being able to do it.

  Furthermore, in the receiving system shown in FIG. 1a and FIG. 1b, since the connection part of each antenna element 11-14 and the 1st process part 1 can be concentrated, a mounting area | region can also be reduced.

  Furthermore, in the receiving system shown in FIG. 1a and FIG. 1b, the first processing unit 1 disposed in the vicinity of the rear glass 5 of the vehicle 4 can complete the high frequency processing, so that the influence of noise received from the vehicle 4 and the surroundings can be reduced. Can be reduced.

  Further, in the past, the antenna sharing the band required a three-dimensional and large loading coil or the like, but in the receiving system shown in FIGS. 1a and 1b, four antennas formed on the rear glass 5 of the vehicle 4 are used. Using elements 11 to 14, it is possible to share in a plurality of bands.

  FIG. 6 is a diagram illustrating an example in which the configuration of the first processing unit 1 is formed on a circuit board.

  As shown in FIG. 3, the first processing unit 1 in the receiving system shown in FIGS. 1a and 1b is arranged in a housing arranged in the vicinity of the antenna element, but the first processing unit shown in FIG. 1 may be formed on a circuit board (circuit board 1 ′), and the circuit board 1 ′ itself may be attached to the rear glass 5 of the vehicle 4 as shown in FIG. Moreover, you may arrange | position the antenna part 10 and the 1st process part 1 not on the rear glass 5 of the vehicle 4, but on another windshield (front glass or side glass).

  7a and 7b are block diagrams showing a schematic configuration of another receiving system according to the present invention. FIG. 7 a mainly shows the first processing unit 200, and FIG. 7 b mainly shows the second processing unit 3 corresponding to the first processing unit 200.

  7a and 7b includes an antenna unit 10 including a plurality of antenna elements, a first processing unit 200 disposed in the vicinity of the antenna unit 10, a first processing unit 200, and a serial data transmission cable 2. The AM broadcast band (522 to 1629 kHz), the FM broadcast band (76 to 90 MHz), and the digital TV (DTV) broadcast band (470 to 770 MHz).

  The difference from the receiving system shown in FIGS. 1a and 1b is that in the receiving system shown in FIGS. 7a and 7b, the AM synthesizer 160 synthesizes the AM signal from each distributor and then converts it into a digital signal. The first and second FM synthesizers 161 and 162 synthesize two FM signals and then convert them into digital signals. Accordingly, the first processing unit 200 includes a first high frequency amplification unit 61 to a seventh high frequency amplification unit 67, a first frequency conversion unit 81, a second frequency conversion unit 82, a sixth frequency conversion unit 86, and a seventh frequency. A conversion unit 87, a first BPF 101 to a seventh BPF 107, and a first AD converter 121 to a seventh AD converter 127 are configured. In FIG. 7a and FIG. 7b, the same number is attached | subjected to the same structure as FIG. 1a and FIG. 1b, and description is abbreviate | omitted.

  In the receiving system shown in FIGS. 7 a and 7 b, AM signal outputs from the AM circuits 21, 31, 41 and 51 of the first distributor 20 to the fourth distributor 50 are input to the AM combiner 160. The combined output is input to the fourth high frequency amplifier 64. The four signal systems for AM are not suitable for performing spatial diversity processing because the antenna elements are arranged too close to each other in the AM wavelength. I decided to use it.

  FIG. 8 is a diagram illustrating a schematic configuration of the AM synthesis unit 160.

  As shown in FIG. 8, the AM synthesis unit 160 is configured to synthesize an unbalanced signal with unbalance using an in-phase wound transformer.

  7a and 7b, the FM signal outputs from the FM circuits 32 and 52 of the second distributor 30 and the fourth distributor 50 are input to the first FM synthesizer 161 to be combined output. Is input to the third high-frequency amplifier 63. Also, FM signal outputs from the FM circuits 21 and 41 of the first distributor 20 and the third distributor 40 are input to the second FM combiner 162, and the combined output is sent to the fifth high-frequency amplifier 65. It is configured to be entered.

  The output of the first FM synthesizer 161 is amplified by the third high-frequency amplifier 63, passes through the third BPF 103, becomes an intermediate frequency signal, and is converted into a digital signal by the third AD converter 123. Similarly, the output of the second FM synthesizer 162 is amplified by the fifth high frequency amplifier 65, passes through the fifth BPF 105, and the high frequency signal is directly converted into a digital signal by the fifth AD converter 125. The digital signal is multiplexed by the multiplexing unit 140, converted into a serial signal by the serial data sending unit 141, transmitted to the second processing unit 3, demodulated by the FM demodulation processing unit 153, and demodulated. An optimum FM signal is formed by performing spatial diversity processing by maximum ratio combining using the signal.

  FIG. 9 is a diagram illustrating a schematic configuration of the first FM synthesis unit 161.

  The first FM synthesizing unit 161 shown in FIG. 9A is configured to synthesize an unbalanced signal with unbalance using an in-phase wound transformer.

  Further, the first FM synthesizing unit 161 shown in FIG. 9B is configured to synthesize a balanced signal and output it as an unbalanced signal using an in-phase wound transformer. If the configuration shown in FIG. 9B is used as the first FM synthesizing unit and the second FM synthesizing unit, when receiving broadcast waves in the FM broadcast band, the first antenna element 11, the second antenna element 12, It becomes possible to operate the 3 antenna element 13 and the 4th antenna element 14 as a dipole antenna. Therefore, when the configuration shown in FIG. 9B is used as the first FM synthesizing unit and the second FM synthesizing unit, it is not an operation in which the vehicle 4 is a virtual ground, and it is easy to obtain a stable reception characteristic in principle. There is.

  Thus, in the receiving system shown in FIGS. 7a and 7b, similarly to the receiving system shown in FIGS. 1a and 1b, each of the four antenna elements 11 to 14 having the same length has a plurality of bands, that is, a DTV. Since it is configured to receive high-frequency signals in the broadcast band, FM broadcast band, and AM broadcast band, the antenna unit can be configured in a small space.

  In the receiving system shown in FIGS. 7a and 7b, a first processing unit 1 that converts a high-frequency signal into a digital signal and multiplexes the digital signal to generate serial data is disposed near the antenna unit 10. Serial data is transmitted by the cable 2 to the second processing unit 3 arranged at a predetermined position of the vehicle 4. Therefore, there is no need to route a plurality of high-frequency signals through the vehicle 4 with a plurality of cables, saving the amount of cables and space for arranging the cables, attenuation of high-frequency signals by transmitting the cables, and prevention of generation of high-frequency noise. There are advantages such as being able to do it.

  By the way, the configuration of the first processing unit 200 in the reception system shown in FIGS. 7a and 7b is also formed on a predetermined circuit board and pasted on the rear glass 5 of the vehicle 4 as shown in FIG. You may do it.

  10a and 10b are block diagrams showing a schematic configuration of still another receiving system according to the present invention. FIG. 10 a mainly shows the first processing unit 210, and FIG. 10 b mainly shows the second processing unit 3 corresponding to the first processing unit 210.

  The receiving system shown in FIGS. 10 a and 10 b includes an antenna unit 10 ′ composed of a plurality of antenna elements and a plurality of reactances, a first processing unit 210 and a first processing unit 210 arranged in the vicinity of the antenna unit 10. The AM broadcasting band (522 to 1629 kHz), FM broadcasting band (76 to 90 MHz), and digital TV (DTV) which are composed of the second processing unit 3 and the like connected by the serial data transmission cable 2 and are used in Japan. It is configured to support broadcast waves in the broadcast band (470 to 770 MHz).

  FIG. 11 is a diagram illustrating a state where the antenna unit 10 ′ and the first processing unit 210 of the reception system illustrated in FIG. 10A are attached to the rear window 5 from the inside of the vehicle body 4.

  As shown in FIG. 11, the first reactance L <b> 1 to the third reactance L <b> 3 are disposed on the rear glass 5 surface of the vehicle 4.

  The difference from the receiving system shown in FIGS. 7a and 7b is that in the receiving system shown in FIGS. 10a and 10b, the ends of the fourth antenna element 14 and the second antenna element 12 are connected by the first reactance L1. The first distributor, the end of the second antenna element 12 and the first antenna element 11 are connected by the second reactance L2, and the end of the first antenna element 11 and the third antenna element 13 are connected by the third reactance L3. In the 20th to third distributors 40, the AM circuits 21, 31 and 41 shown in FIG. 7a are deleted, and the AM combiner 160 shown in FIG. 7a is deleted. 10A and 10B, the same components as those in FIGS. 7A and 7B are denoted by the same reference numerals, and description thereof is omitted.

  As described above, since it is difficult to form an antenna element having a sufficient length with respect to the wavelength of the AM band on the rear glass 5 of the vehicle 4, the antenna element is equivalently equivalent to a combination of signals of a plurality of systems. It may be advantageous to make the length longer for good reception. Therefore, in the receiving system shown in FIG. 10, the antenna elements are connected to each other by the first reactance L1 to the third reactance L3, and the broadcast wave in the AM band is equivalent to four lines as indicated by a dotted line 170 shown in the figure. The antenna element of the length which connected the antenna element of this is made to exist. Therefore, the AM signal is output only from the AM circuit 51 of the fifth distributor 50, and the AM combiner 160 shown in FIG. 7 is not necessary.

  Here, the first reactance L1 to the third reactance L3 have a small amount of inductive reactance at 1629 kHz, which is the highest frequency in the AM band, and operate as if the antenna elements are connected, and 76 MHz, which is the lowest frequency in the FM band. Then, a value is selected that has a large inductive reactance and operates as if each antenna element is divided. For example, when a reactance of 1 μH is selected as the first reactance L1 to the third reactance L3, the inductive reactance at 1629 kHz is about j10Ω and the inductive reactance at 76 MHz is about j480Ω, which satisfies the above condition.

  Since other operations in the receiving system shown in FIGS. 10a and 10b are the same as those in the receiving system shown in FIGS. 7a and 7b, each of the four antenna elements 11 to 14 having the same length has a plurality of bands, That is, it is configured to receive high-frequency signals in the DTV broadcast band, FM broadcast band, and AM broadcast band, and the antenna unit 10 'can be configured with a small space.

  In the receiving system shown in FIGS. 10a and 10b, a first processing unit 1 that converts a high-frequency signal into a digital signal and multiplexes the digital signal to generate serial data is disposed near the antenna unit 10 ′. The serial data is transmitted by the cable 2 to the second processing unit 3 arranged at a predetermined position of the vehicle 4. Therefore, there is no need to route a plurality of high-frequency signals through the vehicle 4 with a plurality of cables, saving the amount of cables and space for arranging the cables, attenuation of high-frequency signals by transmitting the cables, and prevention of generation of high-frequency noise. There are advantages such as being able to do it.

  12a and 12b are block diagrams showing a schematic configuration of still another receiving system according to the present invention. FIG. 12 a mainly shows the first processing unit 220, and FIG. 12 b mainly shows the second processing unit 3 corresponding to the first processing unit 220.

  12a and 12b includes an antenna unit 10 including a plurality of antenna elements, a first processing unit 220 disposed in the vicinity of the antenna unit 10, a first processing unit 220, and a serial data transmission cable 2. The AM broadcast band (522 to 1629 kHz), the FM broadcast band (76 to 90 MHz), and the digital TV (DTV) broadcast band (470 to 770 MHz).

  7A and 7B is different from the reception system shown in FIGS. 12A and 12B in the first switch 181 and the first FM synthesizer 161 that control the input of the AM signal to the AM synthesizer 160 in the reception system shown in FIGS. 12A and 12B. A second switch 191 that controls the input of the FM signal to the FM and a third switch 192 that controls the input of the FM signal to the second FM synthesizer 162 are provided, and the AM level detector 180 controls the first switch. The second and third switches are controlled by the FM level detector 190. 12A and 12B, the same components as those in FIGS. 7A and 7B are denoted by the same reference numerals, and description thereof is omitted.

  The first switch 181, the second switch 191 and the second switch 192 are normally ON. That is, at the normal time, similarly to the reception system shown in FIG. 7, the AM synthesizer 160 synthesizes four AM signals and outputs them to the fourth high-frequency amplifier 64. The first FM synthesizer 161 The two FM signals are combined and output to the third high-frequency amplifier 63, and the second FM combiner 162 combines the two FM signals and output to the fifth high-frequency amplifier 65. is doing.

  The AM level detector 180 monitors the output of the fourth AD converter 124. When the vehicle 4 is close to a broadcasting station or the like and the reception level is high, the AM level detector 180 controls the first switch 181 to control a predetermined number of the four systems. Control is performed so that only these lines are synthesized. That is, the AM level detector 180 controls the synthesis of a plurality of signals and the cancellation of the synthesis in the AM synthesis unit 160.

  The FM level detector 190 monitors the outputs of the third AD converter 123 and the fifth AD converter 125. When the vehicle 4 is close to a broadcasting station or the like and the reception level is high, the second switch 191 and / or the third switch 192 is used. Is controlled to stop the synthesis of the two systems. That is, the FM level detector 190 controls the synthesis of a plurality of signals and the cancellation of the synthesis in the first FM synthesis unit 161 and the second FM synthesis unit 162.

  As described above, the reception system shown in FIGS. 12a and 12b is configured to perform optimum reception for the AM band and the FM band by using the AM level detector 180 and the FM level detector 190.

  Since the other operations in the receiving system shown in FIGS. 12a and 12b are the same as those in the receiving system shown in FIG. 7, each of the four antenna elements 11 to 14 having the same length has a plurality of bands, that is, a DTV. It is configured to receive high frequency signals in the broadcast band, FM broadcast band, and AM broadcast band, and the antenna unit can be configured with a small space.

  12a and 12b, in the vicinity of the antenna unit 10, the first processing unit 1 that converts a high-frequency signal into a digital signal and multiplexes the digital signal to generate serial data is disposed. Serial data is transmitted by the cable 2 to the second processing unit 3 arranged at a predetermined position of the vehicle 4. Therefore, there is no need to route a plurality of high-frequency signals through the vehicle 4 with a plurality of cables, saving the amount of cables and space for arranging the cables, attenuation of high-frequency signals by transmitting the cables, and prevention of generation of high-frequency noise. There are advantages such as being able to do it.

It is a block diagram which shows schematic structure of the 1st process part 1 of the receiving system which concerns on this invention. It is a block diagram which shows schematic structure of the 2nd process part 3 of the receiving system which concerns on this invention. It is a figure which shows an example at the time of observing the example of arrangement | positioning of the antenna part 10 grade | etc., From the exterior of a vehicle. It is a figure which shows an example at the time of observing the example of arrangement | positioning of antenna part 10 grade | etc., From the inside of a vehicle. 3 is a diagram illustrating a specific configuration example of a first distributor 20. FIG. It is the figure which showed the example of the frequency band which each circuit 21-23 of the 1st divider | distributor 20 passes. It is a figure which shows the example which formed the structure of the 1st process part 1 on the circuit board. It is a block diagram which shows schematic structure of the 1st process part 200 of the other receiving system which concerns on this invention. It is a block diagram which shows schematic structure of the 2nd process part 3 of the other receiving system which concerns on this invention. 2 is a diagram illustrating a schematic configuration of an AM combining unit 160. FIG. It is a figure which shows schematic structure of the 1st FM synthetic | combination part 161. FIG. It is a block diagram which shows schematic structure of the 1st process part 210 of the further another receiving system which concerns on this invention. It is a block diagram which shows schematic structure of the 2nd process part 3 of the further another receiving system which concerns on this invention. It is a figure which shows the state which affixed the antenna part 10 'and the 1st process part 1 of the receiving system shown in FIG. It is a block diagram which shows schematic structure of the 1st process part 220 of the further another receiving system which concerns on this invention. It is a block diagram which shows schematic structure of the 2nd process part 3 of the further another receiving system which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,200,210,220 1st process part 2 Cable 3 2nd process part 4 Vehicle 5 Rear glass 10, 10 'Antenna part 11, 12, 13, 14 Film element 20, 30, 40, 50 Distributor 61-72 High frequency Amplifier 81-92 Frequency converter 101-112 BPF
121-132 AD converter 140 Multiplexer 141 Serial data transmitter 150 Serial data receiver 151 Demultiplexer 152 AM demodulation processor 153 FM demodulation processor 154 DTV demodulation processor 160 AM combiner 161, 162 FM combiner 180 AM Level detection unit 181 First switch 190 FM level detection unit 191 Second switch 192 Third switch

Claims (8)

Equipped with multiple antennas that can receive high frequency signals in multiple bands,
A plurality of distributors for dividing the signals from the plurality of antennas for each band;
A digital signal converter for converting the output from the distributor into a digital signal, and
A multiplexing processing unit that multiplexes digital signals from the digital signal conversion unit;
A receiving system comprising:   The receiving system according to claim 1, further comprising a combining unit configured to combine a plurality of signals in the same band divided by the plurality of distributors.   The receiving system according to claim 2, wherein the combining unit includes a balanced-unbalanced converter.   The receiving system according to claim 2, further comprising a control unit that controls synthesis of a plurality of signals by the synthesis unit and cancellation of the synthesis.   The receiving system according to any one of claims 1 to 4, further comprising a connection unit that operates so that the plurality of antennas are equivalently connected in a part of a frequency band.   The receiving system according to any one of claims 1 to 5, wherein the plurality of antennas are arranged on a windshield of an automobile. A cable for transmitting a signal output from the multiplexing processing unit;
The receiving system according to claim 1, further comprising a demodulator for demodulating a signal received via the cable. It has multiple antennas that receive high-frequency signals in multiple bands arranged on the windshield,
A plurality of distributors for dividing the signals from the plurality of antennas for each band;
A digital signal converter for converting the output from the distributor into a digital signal, and
A multiplexing processing unit that multiplexes digital signals from the digital signal conversion unit;
A cable for transmitting a signal output from the multiplexing processing unit;
A demodulator for demodulating a signal received via the cable;
The vehicle characterized by having.

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