JP2011025850A - In-vehicle broadcasting receiving system, and automobile equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle broadcasting receiving system whose transmission line can be easily allocated, which increases the degree of freedom in allocating the transmission line by such a way as to allocate other transmission lines for other equipment within a pillar. <P>SOLUTION: The in-vehicle broadcasting receiving system is composed of: a plurality of antennas 2, 2, ... allocated on the roof of a vehicle, and a tuner 3 connected with the plurality of antennas, and extracting and outputting broadcasting signals corresponding to a desired channel from the signals that the plurality of antennas have received; and a display device 6 that indicates images related to the broadcasting signals that the tuner 3 has outputted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle broadcast receiving system that is mounted on a vehicle and includes a plurality of antennas for receiving broadcasts, particularly digital television broadcasts, and an automobile including the system.

  2. Description of the Related Art Conventionally, vehicle-mounted televisions that receive radio waves related to television broadcasting by mounting an antenna and a tuner on a vehicle and display a television program on a display device disposed in the vehicle have become widespread. In an in-vehicle broadcast receiving system, a vehicle is often equipped with a plurality of antennas in order to receive a stable radio wave. This is a so-called diversity reception technology that increases the reception sensitivity of radio waves by combining signals received by multiple antennas, or by selecting the best received signal among multiple received signals. Technology. In particular, when the vehicle is running, the reception status of the antenna always changes due to the influence of buildings and the like. Therefore, by using a diversity reception system that attaches multiple antennas to various parts of the car body, even if the reception status of one antenna deteriorates, other antennas can be received well because their mounting positions are different. it can. In the in-vehicle broadcast receiving system based on the diversity system, signals can be received better as the number of antennas increases, and it is preferable to mount each of the four antennas at the four corners of the vehicle roof. For example, Patent Document 1 proposes an in-vehicle broadcast receiving system in which four antennas are mounted on a vehicle, and an antenna having superior reception sensitivity is selected from the four antennas and connected to a receiving circuit.

  FIG. 5 is a block diagram showing a configuration of a conventional in-vehicle broadcast receiving system for receiving digital broadcasting, and FIG. 6 is a schematic diagram thereof. In the figure, reference numeral 1 denotes a vehicle. On the left and right upper sides of the windshield and rear glass of the vehicle 1, four antennas 2, 2. . . Are arranged respectively. Further, a tuner 3 for receiving digital broadcasts is disposed at the front of the vehicle 1 on the back side of the instrument panel, for example. Each antenna 2 is connected to a tuner 3 via an amplifier 4 for amplifying the received signal and a transmission line 5 for transmitting the received signal. Since the antenna 2 is located near the top of the windshield and the rear glass, the four transmission lines 5 are often arranged up to the tuner 3 through pillars.

JP 2007-281611 A

  However, the vehicle is equipped with various electronic devices to improve driving safety and convenience, and a power cable for connecting to a power supply source such as a battery to operate the electronic device. In addition, a transmission line such as a communication cable for transmitting and receiving data to and from a control device such as an ECU (Electronic Control Unit) must be provided in the vehicle. In recent years, the number of electronic devices provided on the ceiling of the vehicle and in the vicinity thereof has increased, and the number of transmission lines has also increased. However, it is possible to secure a large transmission line space in the vehicle pillar. is not. In addition, a plurality of transmission lines may interfere with each other and become inappropriate if they are arranged in the same pillar. Furthermore, if a large number of transmission lines are arranged in one pillar and are used continuously, the transmission lines may be damaged due to vehicle vibrations or the like, and in the worst case, the transmission lines may be disconnected.

  For this reason, as described above, in the conventional in-vehicle broadcast receiving system, it is proposed in Patent Document 1 to arrange four transmission lines connecting four antennas and the tuner 3 in the pillar of the vehicle. Actually, it is not easy to arrange four transmission lines in the left or right front and rear two pillars together. In particular, when arranging together with other cables in the pillar, the total number of cables increases, and all the cables cannot be accommodated in the pillar, which may make the arrangement difficult.

  The present invention has been made in view of such circumstances, and is connected to a plurality of antennas arranged on the roof of a vehicle to receive broadcasts, and transmits broadcast signals received by the plurality of antennas to a display device in the vehicle. By arranging the tuner in the in-vehicle broadcast receiving system including the tuner to be mounted on the roof, a plurality of transmission lines connecting the plurality of antennas and the tuner are arranged in the roof of the vehicle, and the tuner and the display device are connected. In-vehicle broadcast receiving system capable of facilitating the arrangement of the transmission line for the transmission, and increasing the degree of freedom relating to the arrangement of the transmission line, such as arranging the transmission line of other equipment in the pillar, and the like The object is to provide an automobile equipped with a system.

  The in-vehicle broadcast receiving system of the present invention is arranged on the roof of a vehicle, and is connected to a plurality of antennas for receiving broadcasts and the plurality of antennas, and corresponds to a desired channel from signals received by the plurality of antennas. A tuner that extracts and outputs a broadcast signal to be output; and a display device that is disposed in a vehicle and displays an image related to the broadcast signal output by the tuner.

  In the present invention, since the tuner is arranged on the roof of the vehicle together with the plurality of antennas, a plurality of transmission lines connecting the tuner and the plurality of antennas are also arranged in the roof of the vehicle. Therefore, it is not necessary to arrange transmission lines for each of the four antennas in the pillar, and the transmission lines can be easily arranged.

  In the in-vehicle broadcast receiving system according to the present invention, the tuner is configured to transmit the broadcast signal to the display device via a single transmission line.

  In the present invention, the tuner is connected to the display device by a single transmission line. Therefore, in the broadcast receiving system, it is only necessary to arrange the one transmission line in the pillar. Compared to the case where the transmission lines for each of the four antennas are arranged in the pillar, the transmission line in the vehicle pillar is not necessary. The arrangement can be facilitated, and the degree of freedom related to the arrangement of the transmission line can be increased, for example, the transmission line of another device can be arranged in the pillar.

  The in-vehicle broadcast receiving system of the present invention further includes a power supply line that supplies power from the display device to the tuner, and the tuner superimposes the broadcast signal on the power supply line. It is comprised so that it may transmit to.

  In the present invention, the tuner superimposes the broadcast signal including the video signal and / or the audio signal on the power supply line and transmits it to the display device. Therefore, the signal between the tuner and the display device in the pillar of the vehicle. It is not necessary to arrange a transmission line for transmitting and receiving, and the degree of freedom related to the arrangement of the transmission line can be further increased, for example, by arranging a transmission line of another device in the pillar.

  In the in-vehicle broadcast receiving system according to the present invention, the tuner is configured to wirelessly transmit the broadcast signal to the display device.

  In this invention, since the tuner is wirelessly connected to the display device, it is not necessary to arrange a transmission line for connecting the tuner and the display device in the pillar of the vehicle. The degree of freedom related to the arrangement of the transmission line can be further increased, for example, by arranging the transmission line of another device.

  The in-vehicle broadcast receiving system according to the present invention is characterized in that a control signal is further transmitted and received between the display device and the tuner.

  In the present invention, the display device transmits a control signal such as a channel selection signal to the tuner, and the tuner sets a reception channel according to the channel selection signal, and then returns a response signal to the display device. Thereby, between a display apparatus and a tuner, a control signal can be superimposed on a broadcast signal, and it can transmit / receive by the said one transmission line or radio | wireless.

  The automobile of the present invention includes the above-described in-vehicle broadcast receiving system.

  In the present invention, since the in-vehicle broadcast receiving system of the present invention is provided, the degree of freedom in the layout design of the transmission line even if the number of cables accommodated in the pillar is generally a large number of advanced models. Can also increase.

  ADVANTAGE OF THE INVENTION According to this invention, arrangement | positioning of the transmission line in the pillar of a vehicle can be made easy, and the freedom degree regarding arrangement | positioning of a transmission line, such as arranging the transmission line of another apparatus in a pillar, is raised. Can do.

It is a block diagram which shows the structure of the vehicle-mounted digital broadcast receiving system which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the structure of the vehicle carrying the vehicle-mounted digital broadcast receiving system which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the vehicle-mounted digital broadcast receiving system which concerns on Embodiment 2. FIG. It is a schematic diagram which shows the structure of the vehicle carrying the vehicle-mounted digital broadcast receiving system which concerns on Embodiment 2. FIG. It is a block diagram which shows the structure of the conventional in-vehicle digital broadcast receiving system. It is a schematic diagram which shows the structure of the vehicle carrying the conventional vehicle-mounted digital broadcast receiving system.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of an in-vehicle digital broadcast receiving system according to Embodiment 1 of the present invention, and FIG. 2 shows the configuration of a vehicle equipped with the in-vehicle digital broadcast receiving system according to Embodiment 1 of the present invention. It is a schematic diagram shown. In the figure, reference numeral 1 denotes a vehicle. On the left and right upper sides of the windshield and rear glass of the vehicle 1, four antennas 2, 2. . . Are arranged respectively. A tuner 3 is arranged on the roof of the vehicle 1. Further, as shown in FIG. 2, the display device 6 is a front seat display device, which is arranged on an instrument panel or the like, and is mainly viewed by a passenger in a front seat of a driver seat or a passenger seat. However, the present invention is not limited to this. The display device 6 is arranged as a rear seat display device that is suspended from a ceiling portion of a vehicle interior via a support, is disposed on a seat back portion of a front seat, a back surface of a headrest, or the like. It may be visually recognized. Note that both the front seat display device and the rear seat display device may be arranged so that all the passengers in the vehicle can visually recognize. The four antennas 2, 2. . . And the arrangement position of the display apparatus 6 is substantially the same as the arrangement position in the conventional in-vehicle digital broadcast receiving system.

  The in-vehicle digital broadcast receiving system according to the first embodiment includes the four antennas 2, 2. . . Are respectively connected to the tuner 3 via an amplifier 4 (not shown in FIG. 2) for amplifying the received signal and a transmission line 5 for transmitting the received signal. The antenna 2 is for receiving radio waves related to digital terrestrial television broadcasting having a frequency of 470 MHz to 770 MHz, for example. Four antennas 2,2. . . Receive the same radio wave, but the received signals received by the antennas 2 have different signal strengths due to the positional relationship between the radio wave destination and the vehicle 1 and the influence of buildings around the vehicle 1. Four antennas 2,2. . . Receives broadcast waves of digital television broadcasts and converts them into broadcast signals that are electrical signals. A signal received by each antenna 2 is amplified by an amplifier 4 and applied to a tuner 3 located on the roof via a transmission line 5.

  The tuner 3 includes four antennas 2, 2. . . The broadcast signal is received and the signals received by the plurality of antennas are combined, or the signal having the best reception state is selected from the plurality of received signals. The tuner 3 extracts a broadcast signal corresponding to a predetermined channel selection channel from the synthesized or selected received signal, and outputs it to the display device 6 via the transmission line 7. Since the video signal and the audio signal are superimposed on the broadcast signal, the broadcast signal on which the video signal and the audio signal are superimposed is transmitted from the tuner 3 to the display device 6 through the transmission line 7.

  The display device 6 includes a signal processing unit, a display unit, an audio unit, and a control unit. The signal processing unit demodulates and decodes the broadcast signal from the tuner 3, converts it into an analog video signal and audio signal, and outputs them to the display unit and the audio unit, respectively. The display unit is composed of a liquid crystal display or the like, and displays a video corresponding to the video signal from the signal processing unit. The audio unit includes an amplifier and a speaker. In the audio unit, the audio signal from the signal processing unit is amplified by an amplifier and output from the speaker. The control unit includes an operation unit and a control unit. The operation unit includes a remote controller, a touch panel, and the like, and receives various operations from the user. The control unit centrally controls each part of the digital broadcast receiving system according to various operations received by the operation unit, and various processes such as a reception channel setting process, a display control process, a switching process, and a brightness adjustment process. Execute.

  When a reception channel setting operation is performed by the user via the operation unit, the control unit outputs a control signal corresponding to the operation to the tuner 3 via the transmission line 7. That is, the video signal, the audio signal, and the control signal between the tuner 3 and the display device 6 are transmitted by being superimposed on the transmission line 7 (Note that although it is necessary to connect the power supply line, the tuner 3 and the display device 6 are connected. The video signal, the audio signal, and the control signal may be transmitted while being superimposed on the power supply line. As a result, the four antennas 2, 2. . . A plurality of transmission lines 5 for connecting the tuner 3 and the tuner 3 are arranged in the roof of the vehicle, and one transmission line 7 for connecting the tuner 3 and the display device 6 is arranged in the pillar of the vehicle 1. Only four antennas 2, 2. . . As compared with the case where each transmission line 5 is arranged in the pillar, the arrangement of the transmission line in the pillar of the vehicle 1 can be facilitated, and the transmission lines of other devices are arranged in the pillar. The degree of freedom related to the arrangement of the transmission line can be increased. In particular, as the model becomes more sophisticated, the number of cables accommodated in the pillar generally increases and the arrangement becomes difficult. However, the first embodiment can solve such a problem, and the arrangement design can be improved. The degree of freedom increases.

  In the present embodiment, the arrangement positions of the antenna 2, the tuner 3, the transmission lines 5, 7 and the display device 6 in the vehicle 1 are not limited to those shown in FIG. In addition, the in-vehicle digital broadcast receiving system receives radio waves related to terrestrial digital television broadcasts, but is not limited to this, and is not limited to satellite digital television broadcasts, terrestrial digital audio broadcasts (digital radio), mobile phones / A similar configuration can be applied to a system that receives a one-segment partial reception service (one-segment) for mobile terminals or other digital broadcasts such as digital data broadcasts.

(Embodiment 2)
Hereinafter, a vehicle-mounted digital broadcast receiving system according to Embodiment 2 of the present invention will be described in detail with reference to the drawings. The on-vehicle digital broadcast receiving system according to the first embodiment described above is configured to superimpose and transmit the video signal, audio signal, and control signal between the tuner 3 and the display device 6 via the transmission line 7. In contrast, the in-vehicle digital broadcast receiving system according to the second embodiment is configured to transmit a video signal, an audio signal, and a control signal between the tuner 3 and the display device 6 via a wireless LAN device.

  FIG. 3 is a block diagram showing the configuration of the in-vehicle digital broadcast receiving system according to Embodiment 2 of the present invention. FIG. 4 is a schematic diagram showing a configuration of a vehicle equipped with an in-vehicle digital broadcast receiving system according to Embodiment 2 of the present invention. In the figure, reference numeral 1 denotes a vehicle. On the left and right upper sides of the windshield and rear glass of the vehicle 1, four antennas 2, 2. . . Are arranged respectively. A tuner 3 is arranged on the roof of the vehicle 1. Similarly to the first embodiment, the display device 6 may be a front seat display device or a rear seat display device, or may be arranged as both a front seat display device and a rear seat display device. The arrangement positions of the four antennas and the display device 6 in the vehicle 1 are substantially the same as the arrangement positions in the conventional in-vehicle digital broadcast receiving system.

  The in-vehicle digital broadcast receiving system according to the present embodiment includes the four antennas 2, 2. . . Are respectively connected to the tuner 3 via an amplifier 4 (not shown in FIG. 4) for amplifying the received signal and a transmission line 5 for transmitting the received signal. Four antennas 2,2. . . Receives broadcast waves of digital television broadcasts and converts them into broadcast signals that are electrical signals. A signal received by each antenna 2 is amplified by an amplifier 4 and applied to a tuner 3 located on the roof via a transmission line 5.

  The tuner 3 includes four antennas 2, 2. . . The broadcast signal is received and the signals received by the plurality of antennas are combined, or the signal having the best reception state is selected from the plurality of received signals. The tuner 3 extracts a broadcast signal corresponding to a predetermined channel selection channel from the synthesized or selected received signal, and sends the broadcast signal to the wireless LAN device 8A via the wiring. The wireless LAN device 8A is disposed on the roof in the vicinity of the tuner 3, and inputs and outputs signals to and from the tuner 3 through wiring. When the wireless LAN device 8A receives the signal from the tuner 3, the wireless LAN device 8A wirelessly transmits the signal to the wireless LAN device 8B. Since the video signal and the audio signal are superimposed on the broadcast signal, the broadcast signal on which the video signal and the audio signal are superimposed is transmitted from the tuner 3 to the display device 6 between the wireless LAN devices 8A and 8B. .

  The wireless LAN device 8B is provided close to the display device 6 in an instrument panel or the like, and inputs / outputs signals to / from the display device 6 through wiring. Signals are transmitted and received between the wireless LAN devices 8A and 8B by wireless LAN standards such as IEEE802.11b, IEEE802.11g, IEEE802.11a, or near field communication such as Bluetooth (registered trademark). When receiving the broadcast signal transmitted from the tuner 3 via the wireless LAN device 8A, the wireless LAN device 8B outputs the broadcast signal to the display device 6 through wiring.

  Similar to the first embodiment, the display device 6 includes a signal processing unit, a display unit, an audio unit, and a control unit. The signal processing unit demodulates and decodes the broadcast signal from the tuner 3, converts it into an analog video signal and audio signal, and outputs them to the display unit and the audio unit, respectively. The display unit is composed of a liquid crystal display or the like, and displays a video corresponding to the video signal from the signal processing unit. The audio unit includes an amplifier and a speaker. In the audio unit, the audio signal from the signal processing unit is amplified by an amplifier and output from the speaker. The control unit includes an operation unit and a control unit. The operation unit includes a remote controller, a touch panel, and the like, and receives various operations from the user. The control unit centrally controls each part of the digital broadcast receiving system according to various operations received by the operation unit, and various processes such as a reception channel setting process, a display control process, a switching process, and a brightness adjustment process. Execute.

  When a reception channel setting operation is performed by the user via the operation unit, the control unit outputs a control signal corresponding to the operation to the tuner 3 via the wireless LAN devices 8A and 8B. That is, video signals, audio signals, and control signals between the tuner 3 and the display device 6 are transmitted between the wireless LAN devices 8A and 8B. As a result, the four antennas 2, 2. . . A plurality of transmission lines 5 connecting the tuner 3 and the tuner 3 are arranged in the roof of the vehicle, and signal input / output between the tuner 3 and the display device 6 is performed by the wireless LAN devices 8A and 8B. There is no need to place a transmission line in the pillar, and four antennas 2, 2. . . As compared with the case where each transmission line 5 is arranged in the pillar, the arrangement of the transmission line in the pillar of the vehicle 1 can be facilitated, and the transmission lines of other devices are arranged in the pillar. The degree of freedom related to the arrangement of the transmission line can be increased. In particular, as the model becomes more advanced, the number of cables accommodated in the pillar generally increases and the arrangement becomes difficult. However, the second embodiment can solve such a problem, and the arrangement design can be improved. The degree of freedom increases.

  In the second embodiment, the arrangement positions of the antenna 2, the tuner 3, the transmission line 5, the wireless LAN devices 8A and 8B, the display device 6 and the like in the vehicle 1 are not limited to those shown in FIG. In addition, the in-vehicle digital broadcast receiving system receives radio waves related to terrestrial digital television broadcasts, but is not limited to this, and is not limited to satellite digital television broadcasts, terrestrial digital audio broadcasts (digital radio), mobile phones / A similar configuration can be applied to a system that receives a one-segment partial reception service (one-segment) for mobile terminals or other digital broadcasts such as digital data broadcasts.

  In the present invention, as described above, the tuner 3 is arranged on the roof. However, the inside of the roof may reach a high temperature. It is desirable to take measures such as using heat.

  As mentioned above, although embodiment of this invention was explained in full detail based on drawing, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

1 vehicle 2 antenna 3 tuner 5, 7 transmission line 6 display device 8A, 8B wireless LAN device

Claims (6)

A plurality of antennas arranged on the roof of a vehicle, receiving a broadcast, and a tuner connected to the plurality of antennas and extracting a broadcast signal corresponding to a desired channel from the signals received by the plurality of antennas and outputting the same When,
A vehicle-mounted broadcast receiving system, comprising: a display device that is disposed in a vehicle and displays an image related to a broadcast signal output from the tuner.   The in-vehicle broadcast receiving system according to claim 1, wherein the tuner is configured to transmit the broadcast signal to the display device via a single transmission line. A power supply line for supplying power from the display device to the tuner;
The in-vehicle broadcast receiving system according to claim 1, wherein the tuner is configured to transmit the broadcast signal to the display device while being superimposed on the power supply line.   The in-vehicle broadcast receiving system according to claim 1, wherein the tuner is configured to wirelessly transmit the broadcast signal to the display device.   The in-vehicle broadcast receiving system according to any one of claims 1 to 3, wherein a control signal is further transmitted and received between the display device and the tuner.   An automobile comprising the in-vehicle broadcast receiving system according to any one of claims 1 to 5.

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