JP2008085464A - On-vehicle video/acoustic system, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve convenience for a user by evading the condition that an on-vehicle video / acoustic system becomes a non-video-image / silent state when the reception state of digital terrestrial broadcasting is deteriorated. <P>SOLUTION: When the state where the reception level of the digital terrestrial broadcasting is lower than a reference value continues for prescribed time or longer (S20:YES) and an operation for instructing the change of a selected video / sound source is not input within fixed time (S40:NO), the video / sound source of a switching destination is selected by a prescribed procedure and the digital terrestrial broadcasting is switched to other video / sound source (S60). In this case, the video / sound source selected before the digital terrestrial broadcasting is selected as the switching destination or the video / sound source of the switching destination is selected along the priority of selection candidates specified by a user beforehand. When the reception state of the digital terrestrial broadcasting is restored (S70:YES), video / sound output by the digital terrestrial broadcasting is restored (S80). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle video / audio system that is mounted on a vehicle and capable of receiving digital terrestrial broadcasting.

  In Japan, digital television broadcasting (hereinafter referred to as terrestrial digital broadcasting) began in December 2003 in the three major metropolitan areas of the Kanto, Chukyo, and Kinki regions, and broadcasting began in other regions as well. Has been. Accordingly, in-vehicle video / audio systems compatible with digital terrestrial broadcasting are being put into practical use.

  A receiving device compatible with digital terrestrial broadcasting can provide high-quality video and audio by a technique (error correction) for detecting and correcting errors that occur in the signal transmission process. However, when the radio wave from the broadcasting radio wave transmitting station becomes weak and falls below a certain reception level (reception electric field strength), error correction cannot be completed and video and audio cannot be output suddenly. Such a phenomenon is called a cliff effect. On the other hand, in the case of conventional analog television broadcasting (hereinafter referred to as terrestrial analog broadcasting), the quality of video and audio gradually decreases as the received electric field strength decreases. The cliff effect does not occur.

  When a terrestrial digital broadcast is received by a vehicle, the received electric field strength changes every moment as the vehicle moves. At this time, if the vehicle enters an area where the intensity of the broadcast radio wave is weak, there is a drawback that it is impossible to output video and audio by terrestrial digital broadcasting suddenly. In such a case, the in-vehicle video / audio system becomes silent or unsound, or only a display or voice announcement such as “cannot receive TV broadcast” is made, which impairs convenience for the user.

To solve such problems, when the reception status of terrestrial digital broadcasting deteriorates, even when terrestrial digital broadcasting cannot be received by switching from video / audio output by terrestrial digital broadcasting to output by terrestrial analog broadcasting. A technique has been devised to continue the output of television broadcasting (see, for example, Patent Document 1).
JP 2001-309254 A

  However, since the terrestrial analog broadcast ends in July 2011, the technique described in Patent Document 1 cannot be used after the terrestrial analog broadcast ends. That is, even when the reception state of terrestrial digital broadcasting deteriorates, switching to output by terrestrial analog broadcasting cannot be performed. Therefore, when the reception state of the terrestrial digital broadcast is deteriorated, the video and audio cannot be output, and the problem that the in-vehicle video / sound system is in the no-video / silent state is still not improved.

  The present invention has been made to solve such a problem, and by avoiding a situation in which the in-vehicle video / audio system becomes a no-video / no-sound state when the reception state of terrestrial digital broadcasting deteriorates, It aims at providing the technique for improving the convenience with respect to a user.

  The in-vehicle video / audio system according to claim 1, which has been made to achieve the above problem, is a video output by the output unit when the reception state of the reception unit deteriorates during the output of video / audio by terrestrial digital broadcasting. As audio, the video / audio source selected before digital terrestrial broadcasting is selected is selected. Here, the video / audio source refers to a source for outputting both video and audio, such as a DVD, CD, radio, navigation screen, and the like, and a source for outputting either video or audio. .

  According to the in-vehicle video / audio system configured in this way, when the reception status of terrestrial digital broadcasting deteriorates, the video / audio to be output can be switched to the video / music source before terrestrial digital broadcasting is selected. Thus, it is possible to avoid a situation in which the in-vehicle video / audio system is in a no-video / no-sound state. In addition, since the video / audio source to be switched is the one that the user watched before viewing the terrestrial digital broadcast, the video / audio source that reflects the user's preferences can be selected. Thereby, the convenience with respect to the user of a vehicle-mounted video / audio system can be improved.

  On the other hand, the in-vehicle video / audio system according to claim 2 includes setting means for setting a selection candidate and its priority order from various video / audio sources based on an instruction from a user. When the reception status of the receiving means deteriorates during audio output, the video / audio that is output by the output means has the highest priority and the video / audio that can be output from the selection candidates set by the setting means -Select an audio source.

  According to the in-vehicle video / audio system configured in this way, when the reception state of terrestrial digital broadcasting deteriorates, by switching the video / audio to be output to the video / audio source according to the priority order designated by the user, It is possible to avoid a situation in which the in-vehicle video / audio system is in a no-video / no-sound state. Further, since the priority order can be set for the selection candidate video / audio source, for example, the storage medium is not inserted into a video / audio source (DVD, CD, etc.) that requires insertion of the storage medium when outputting the video / audio. For selection candidates that cannot be used for reasons such as the above, it is possible to skip this video / audio source and select the next priority video / audio source. Accordingly, reliability can be further improved by not selecting an unusable video / audio source while reflecting user preferences.

  By the way, for a video / audio source that requires insertion of a storage medium storing video / audio data when outputting video / audio, such as a DVD or a CD, the storage medium storing the data is not inserted. For example, video / audio cannot be output even if the above selection candidates are set. Therefore, when setting the selection candidates and the priority order thereof from the respective video / audio sources based on an instruction from the user, there is a possibility that the video / audio sources that require insertion of the storage medium may not be used in some cases. It is desirable to consider that there is.

  Therefore, it may be configured like the in-vehicle video / audio system according to claim 3. In other words, when a video / audio source that requires insertion of a predetermined storage medium that stores video / audio data is output as a selection candidate when outputting video / audio, the priority order is higher than the specified video / audio source. It continues to accept designation of selection candidates that are lower. When a video / audio source that does not require insertion of a predetermined storage medium is specified as a selection candidate when outputting video / audio, a selection candidate having a lower priority than the specified video / audio source is specified. Will not accept.

  In this way, when a video / audio source that requires insertion of a storage medium is designated as a selection candidate, the user designates a selection candidate in the next priority order in case the storage medium is not inserted. be able to. On the other hand, for video / audio sources that do not require the insertion of a storage medium such as a radio, it is considered that it can always be used regardless of whether or not the storage medium is inserted. There is no need to specify. Therefore, when such a video / audio source is designated as a selection candidate, unnecessary reception for the user can be saved by not performing subsequent reception.

  Further, as described in claim 4, when the reception state of the receiving means deteriorates during the output of the video / audio by terrestrial digital broadcasting, it depends on the video / audio source selected before the terrestrial digital broadcast is selected. If video / audio output is possible, select this video / audio source, and if it is not possible to output video / audio using the video / audio source selected before digital terrestrial broadcasting is selected, setting means A video / audio source having a high priority and capable of outputting video / audio may be selected from the selection candidates set by the above.

  Furthermore, as in the in-vehicle video / audio system according to claim 5, when the reception status of the terrestrial digital broadcast is recovered, the video / audio output may be restored to the terrestrial digital broadcast again. By doing in this way, the convenience with respect to a user can further be improved.

  In order to realize the selection means in the in-vehicle video / audio system as described above by a computer system, it is only necessary to provide a program operating on the computer system as described in claim 6. Such a program is recorded on a computer-readable storage medium such as a magnetic disk, a CD-ROM, a hard disk, a ROM, or a RAM, and loaded into the computer as necessary, so that the above-mentioned selection means can be used. Functions can be realized.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Description of configuration of in-vehicle AV integrated navigation device 1]
FIG. 1 is a block diagram illustrating a schematic configuration of an in-vehicle AV integrated navigation device 1 according to the embodiment. As shown in FIG. 1, the in-vehicle AV integrated navigation apparatus 1 of the embodiment includes a position detector 21, an operation switch group 22, a terrestrial digital broadcast receiver 23a, a CD drive 23b, a DVD drive 23c, and a digital audio player. 23d, an audio unit 23 composed of various video / audio sources such as an AM / FM tuner 23e, an external storage device (HDD: hard disk drive) 24, a display device 25, an audio amplifier 26, a speaker 27, and the components described above. And a navigation ECU 29 for overall control.

  The position detector 21 receives a radio wave transmitted from an artificial satellite for GPS (Global Positioning System) via a GPS antenna, detects the position of the vehicle, and the magnitude of the rotational motion applied to the vehicle. And a distance sensor for detecting the distance traveled by the vehicle. Each of these sensors has an error of a different nature, and is configured to be used while complementing each other. Depending on the accuracy, a part of the sensors described above may be used, or a steering rotation sensor, a wheel sensor of each rolling wheel, or the like may be used.

The operation switch group 22 includes a touch panel that is configured integrally with the display device 25 and installed on the display surface, and a mechanical key switch provided around the display device 25.
The terrestrial digital broadcast receiver 23a detects a digital terrestrial broadcast television signal received via an antenna (not shown), outputs the obtained video / audio signal to the navigation ECU 29, and also outputs the bit of the video / audio signal. Information relating to the reception status of the terrestrial digital broadcast such as an error rate is output to the navigation ECU 29.

  The CD drive 23b is a device for reading various data stored in the CD 28a when the CD 28a which is a portable storage medium is inserted. As the CD 28a to be read by the CD drive 23b, there is a so-called music CD in which a music signal is stored.

  The DVD drive 23c is a device for reading various data stored in the DVD 28b by inserting the DVD 28b as a portable storage medium. The DVD 28b to be read by the DVD drive 23c stores video / audio / subtitles (for example, DVD-Video), and stores various data such as map information (for example, DVD-ROM). Etc.

  The digital audio player 23d reads and reproduces various types of audio files such as MP3, WMA, ATRAC, and OGG stored in the memory card 28c by inserting the memory card 28c, which is a portable storage medium. It is a device for. In addition, a portable digital audio player having a built-in storage medium such as a hard disk or a flash memory may be connected to output sound reproduced by the portable digital audio player on the vehicle side. .

  The AM / FM tuner 23e detects AM broadcast and FM broadcast radio signals received via an antenna (not shown), and outputs the obtained audio signals to the navigation ECU 29.

  The external storage device (HDD) 24 is for storing various types of information, and reads / writes data from / to a built-in hard disk based on control from the navigation ECU 29. The external storage device 24 includes so-called map matching data for improving position detection accuracy, navigation data including map data and route guidance data, a CD drive 23b, a DVD drive 23c, and a digital audio player 23d. Content data such as video and music dubbed from the above, a program for operating the in-vehicle AV integrated navigation device 1 and the like are stored.

  Note that navigation data such as map data may be read from the DVD drive 23c instead of being stored in the external storage device 24. The external storage device 24 generally uses a hard disk drive based on the amount of data to be stored, but may use a large-capacity flash memory or the like.

  The display device 25 is a color display device having a display surface such as a liquid crystal display. The display device 25 displays various images on the display surface according to the input of the video signal from the navigation ECU 29. For example, as a navigation screen, a mark indicating the current location identified from the current position of the vehicle detected by the position detector 21 and the map data input from the external storage device 24, a guidance route to the destination, a name, a landmark, Additional data such as landmark symbols are displayed in an overlapping manner. The display device 25 also includes digital TV images from the terrestrial digital broadcast receiver 23a, content data stored in the CD drive 23b, DVD drive 23c, digital audio player 23d, AM / FM tuner 23e, external storage device 24, and the like. Various images can be displayed such as the playback status of the touch panel and the touch panel type operation switch.

  The audio amplifier 26 is for amplifying an audio signal, and the amplified audio is output from the speaker 27. The speaker 27 is composed of a plurality (for example, four or five) and is arranged at various locations in the vehicle. Then, a guide voice as a result of processing executed by the navigation ECU 29 based on voice data of various guides stored in the external storage device 24, a CD drive 23b, a DVD drive 23c, a digital audio player 23d, an external storage device 24, etc. The sound reproduced based on the sound signal of the music or the like input from can be output. Also, sound based on broadcast signals received via the terrestrial digital broadcast receiver 23a and the AM / FM tuner 23e can be output.

  The navigation ECU 29 is configured around a known microcomputer including a CPU, ROM, RAM, encoder, decoder, I / O, a bus line connecting these components, and the like, and controls the above-described components. The navigation ECU 29 executes various processes related to navigation and video / audio output (audio visual) according to a program read from the ROM, the external input device 24, or the like.

  For example, the navigation-related processing includes map display processing and route guidance processing. In the map display process, the current position of the vehicle is calculated as a set of coordinates and traveling directions based on each detection signal from the position detector 21, and a map or the like near the current position read from the external storage device 24 is displayed on the display device 25. It is a process to display. The route guidance process is a destination that is the optimum route from the current position to the destination based on the point data stored in the external storage device 24 and the destination set according to the operation of the operation switch group 22. This is a process of calculating a route and performing travel guidance for the calculated destination route.

  On the other hand, the audio-visual processing includes various videos such as terrestrial digital broadcast receiver 23a, CD drive 23b, DVD drive 23c, digital audio player 23d, AM / FM tuner 23e, and content data stored in external storage device 24. There is a process of outputting, from the display device 25 and the speaker 27, the video / audio based on the video / audio signal from the video / audio source selected by the user among the audio sources.

  For example, when terrestrial digital broadcasting is selected, a television image and sound received via the terrestrial digital broadcast receiver 23a are output. At this time, it is also possible to select a viewing mode in which a navigation screen is displayed on the display device 25 and only the sound of digital terrestrial broadcasting is output.

  When a source for only audio output, such as music data stored in the CD drive 23b, the digital audio player 23d, the AM / FM tuner 23e, and the external storage device 24, is being selected, Displays operations for channel selection, playback / stop, recording, volume control, and other operations.

  In the present embodiment, the navigation ECU 29 executes the following process as a process in the process related to the audio visual described above. That is, when the terrestrial digital broadcast reception state of the terrestrial digital broadcast receiver 23a is deteriorated while the terrestrial digital broadcast is selected as the video / audio output, the output video / audio source is appropriately switched (output switching process). A detailed description of the “output switching process” will be described later.

  The schematic configuration of the in-vehicle AV integrated navigation device 1 has been described above. The correspondence between the configuration of the in-vehicle AV integrated navigation device 1 in the present embodiment and the configuration described in the claims is as follows. . The terrestrial digital broadcast receiver 23a of the in-vehicle AV integrated navigation device 1 in the present embodiment corresponds to the receiving means in the claims. The display device 25, the audio amplifier 26, and the speaker 27 correspond to output means. The navigation ECU 29 corresponds to selection means and setting means.

  Hereinafter, the “output switching process” executed by the navigation ECU 29 of the in-vehicle AV integrated navigation device 1 will be described with reference to the flowcharts of FIGS. 2 and 4 and the explanatory diagram of FIG. 3.

[Description of output switching process]
FIG. 2 is a flowchart showing a procedure of “output switching process” executed by the navigation ECU 29 of the in-vehicle AV integrated navigation device 1. This “output switching process” is started after the in-vehicle AV integrated navigation device 1 is activated.

  When the “output switching process” is started, the navigation ECU 29 determines whether or not terrestrial digital broadcasting is selected for at least one of video output and audio output (step 10; hereinafter, steps are simply indicated by the symbol S). ). Here, while it is determined that terrestrial digital broadcasting is not selected (S10: NO), this process is repeated. If it is determined that the terrestrial digital broadcast is selected (S10: YES), the reception level of the currently selected channel is determined based on the information indicating the reception status of the terrestrial digital broadcast input from the terrestrial digital broadcast receiver 23a. It is determined whether or not the state of lower than the reference value has continued for a predetermined time or longer (S20). In order to determine whether the reception level is higher or lower than the reference value, for example, it is determined based on the bit error occurrence rate of the video / audio signal whether the error rate is equal to or lower than the reference value.

  In the case of negative determination in S20 (S20: NO), that is, even if the reception state is good and the reception level is higher than the reference value or the reception level is temporarily low, it is predetermined. If it has not continued for more than the time, the output of the terrestrial digital broadcast is continued as it is (S30), and the process returns to S10.

  On the other hand, if it is determined in S20 that the state where the reception level is lower than the reference value has continued for a predetermined time or longer (S20: YES), that is, if the reception state of terrestrial digital broadcasting has deteriorated, the selected video / audio source It is determined whether or not an operation from the user instructing the change is input within a predetermined time (S40). Here, when it is determined that an operation from the user instructing to change the currently selected video / audio source has been input within a predetermined time (S40: YES), the output of the video / audio is directed to the instructed video / audio source. Switching (S50), the process returns to S10.

  On the other hand, if it is determined in S40 that the user's operation for instructing the change of the selected video / audio source has not been input within a certain period of time (S40: NO), the video / audio source to be switched to is determined in a predetermined procedure. The video / audio output is switched from the terrestrial digital broadcasting to the selected video / audio source (S60: video / audio output selection processing). At this time, for example, a message such as “Because it is out of the reception range of digital terrestrial broadcasting, it is switched to OO (video / audio source name)” is displayed on the display device 25.

  In the present embodiment, as the “video / audio output selection process” of S60, the first embodiment in which the video / audio source selected before digital terrestrial broadcasting is selected as the switching source, and the user in advance In the second embodiment, the switching destination video / audio source is selected according to the priority order of the selection candidates specified by.

  Among these, in the first embodiment, the switching destination video / audio source is selected in the following procedure. First, a video / audio source previously output when digital terrestrial broadcasting is selected by a user is registered in a memory or the like in advance. When the reception state of the terrestrial digital broadcast is deteriorated while the digital terrestrial broadcast is selected as the video / audio output, the video / audio source registered in advance is selected.

  On the other hand, in the second embodiment, the switching destination video / audio source is selected in the following procedure. First, according to the instruction received from the user via the operation screen (see FIG. 3) displayed on the display device 25, the selection candidate of the video / audio source to be switched when the reception state of the terrestrial digital broadcast deteriorates, Set the priority order in advance. When the reception state deteriorates while outputting the terrestrial digital broadcast, the video / audio source to be switched to is selected according to the priority order of selection candidates set in advance. The detailed description of the second embodiment will be described later.

  After switching from terrestrial digital broadcasting to another video / audio source in S60, it is determined whether or not the reception state of the terrestrial digital broadcasting has been recovered (S70). Specifically, based on the information indicating the reception state input from the terrestrial digital broadcast receiver 23a, the reception is performed depending on whether or not the state in which the reception level has been higher than the reference value for a previously selected channel has continued for a predetermined time or more. Determine whether the state has recovered. Here, while it is determined that the reception state has not recovered (S70: NO), this process is repeated. If it is determined that the reception state has been recovered (S70: YES), that is, if the state where the reception level is higher than the reference value continues for a predetermined time or longer, the video / audio output by terrestrial digital broadcasting is restored (S80). The process returns to S10. At this time, for example, a message is displayed on the display device 25 such as “Return to the terrestrial digital broadcast reception range and switch to terrestrial digital broadcast”.

[Description of Video / Audio Output Selection Processing (Second Embodiment)]
Here, before detailed description of “video / audio output selection processing (second embodiment)” of S60 in the “output switching processing” described above, the switching destination when the reception state of the terrestrial digital broadcast deteriorates and A procedure for setting video / audio source selection candidates and their priority order will be described.

FIG. 3 is an explanatory diagram schematically showing an example of the transition of the screen display on the display device 25 when setting the selection candidate of the video / audio source as the switching destination.
The selection candidates and the priority order are set in advance in preparation for deterioration of the reception state of digital terrestrial broadcasting. At the time of setting, a selection candidate setting screen 50 as shown in FIG. This selection candidate setting screen 50 is a list 51 of video / audio sources mounted on the in-vehicle AV integrated navigation device 1, a list 52 of selection candidates designated by the user, and “cancel” to terminate the setting. The button includes a “return” button and a “decision” button for confirming the setting and ending. These are configured to be directly operable by pressing a touch panel formed on the screen of the display device 25.

  As shown in FIG. 3A, the name of each video / audio source is displayed as an item in the video / audio source list 51, and the user directly presses the name of the desired video / audio source. Selection candidates can be specified. Also, items that cannot be displayed on the screen at a time are displayed by pressing the “▲” and “▼” buttons provided at the right end of the video / audio source list 51 and sending the list up and down. be able to. On the other hand, in the selection candidate list 52, the video / audio sources specified by the user from the video / audio source list 51 are displayed from the top in the specified order together with the numbers in the selection order. Here, numbers are assigned in ascending order from the previously selected video / audio source, and this is the priority order of selection candidates. When no selection candidate is designated, nothing is displayed in the selection candidate list 52 and is darkened as shown in FIG.

  Here, when the user presses the items “DVD drive” and “CD drive” in the video / audio source list 51 in order from the state shown in FIG. 3A, the state transitions to the state shown in FIG. . As shown in FIG. 3B, the item “DVD drive” is displayed as the first priority in the selection candidate list 52, and the item “CD drive” is displayed as the second priority. In the video / audio source list 51, the selected items “DVD drive” and “CD drive” are darkened, and the items cannot be operated.

  Note that the CD drive 23b and the DVD drive 23c corresponding to the items of “DVD drive” and “CD drive” selected at this time are both video / audio that requires a storage medium such as the CD 28a, DVD 28b, etc. for video / audio output. It is an audio source. As described above, when a source that requires insertion of a storage medium for video / audio output is selected from the video / audio source list 51, the selection operation from the user is further accepted.

  Next, in the state shown in FIG. 3B, when the item “FM radio” is pressed from the video / audio source list 51, the state transitions to the state shown in FIG. As shown in FIG. 3C, the item “FM radio” is displayed in the selection candidate list 52 as the third highest priority order. On the other hand, the AM / FM tuner 23e corresponding to the selected “FM radio” item is an audio source that does not require insertion of a storage medium for audio output. When a source that does not require insertion of such a storage medium is selected from the video / audio source list 51, as shown in FIG. 3C, all items in the video / audio source list 51 are darkened, The item becomes inoperable. The selection operation of the lower priority video / audio source is not accepted.

  On the other hand, when individually canceling an item once designated as a selection candidate, the item to be deselected in the selection candidate list 52 is pressed. For example, in the state shown in FIG. 3C, when the item “DVD drive” is pressed from the selection candidate list 52 as an item to be deselected, the state transitions to the state shown in FIG. As shown in FIG. 3D, the item “DVD drive” is deleted from the selection candidate list 52, and the ranks of “CD drive” and “FM radio” specified under “DVD drive” are repeated. Go up.

  According to the series of procedures as described above, the selection candidate and the priority order thereof are designated by the user, and when the “decision” button is finally pressed by the user, the setting in the selection candidate list 52 at that time is set. The contents are stored in a memory or the like as a selection candidate list.

  FIG. 4 is a flowchart showing a procedure of “video / audio output selection processing (second embodiment)” executed by the navigation ECU 29. This process is the second embodiment of the process executed in S60 of the “output switching process” (see FIG. 2).

  When starting the “video / audio output selection process (second embodiment)”, the navigation ECU 29 refers to a selection candidate list registered in advance and determines the next selection candidate from the highest priority (S601). . Then, it is determined whether there is a corresponding selection candidate in the list (S602). Here, when it is determined that there is no corresponding selection candidate (S602: NO), a message for notifying the user that the reception state of the terrestrial digital broadcast is bad is displayed on the display device 25 or the speaker. 27 is output by voice (S603), and the process is terminated.

  On the other hand, if it is determined in S602 that there is a corresponding selection candidate (S602: YES), it is determined whether the video / audio source of the selection candidate is usable (S604). Here, if the selection candidate is a video / audio source that requires insertion of a storage medium for video / audio output, it is determined whether or not the storage medium is inserted.

  If it is determined that the video / audio source of the selection candidate is unusable (S604: NO), that is, the selection candidate is a video / audio source that requires insertion of a storage medium, and the storage medium is If not inserted, the process returns to S601. Thereafter, the selection candidate is skipped, and the above-described processing of S601 to S604 is repeated for the next priority selection candidate. On the other hand, if it is determined in S604 that the selection candidate video / audio source is usable (S604: YES), the audio output is switched from terrestrial digital broadcasting to the selection candidate video / audio source (S605).

  Next, it is determined whether the terrestrial digital broadcast screen is selected as the conventional video output or the navigation screen is selected (S606). Here, when it is determined that the navigation screen is selected as the previous video output (S606: navigation screen), the video output continues the navigation screen as it is (S607), and the processing is terminated. In other words, if terrestrial digital broadcasting is selected for audio output only and a navigation screen is selected for video output, only the audio output is switched according to the video / audio source of the selection candidate, and the display of the navigation screen is continued as it is. . As a result, it is possible to execute switching between video and audio sources without impairing convenience for a user who uses navigation.

  On the other hand, if it is determined in S606 that the terrestrial digital broadcast screen is selected as the previous video output (S606: terrestrial digital), it is determined whether there is video output from the video / audio source of the selection candidate (S606: Terrestrial digital). S608). Here, if it is determined that there is video output from the video / audio source of the selection candidate (S608: YES), that is, the video / audio source of the selection candidate is a source capable of reproducing video content such as the DVD drive 23c. If it is, the video output is switched to the video / audio source of the selection candidate (S609), and the process ends.

  On the other hand, if it is determined that there is no video output from the video / audio source of the selection candidate (S608: NO), that is, the video / audio source of the selection candidate is a source of only audio content such as AM / FM tuner 23e. If there is, the video output is switched to the operation screen corresponding to the audio source of the selection candidate (S610), and the process ends.

[effect]
According to the in-vehicle AV integrated navigation device 1 of the above embodiment, the following effects can be obtained.

  According to the first embodiment of the “video / audio output selection process”, when the reception state of the terrestrial digital broadcast deteriorates, the video / audio that was selected before the digital terrestrial broadcast was selected as the video / audio to be output. By switching to the source, it is possible to avoid a situation in which the in-vehicle AV integrated navigation device 1 is in a no-video / no-sound state. In addition, since the video / audio source to be switched is the one that the user has watched before viewing the terrestrial digital broadcast, the user's preference can be reflected. Thereby, the convenience with respect to a user can be improved.

  On the other hand, according to the second embodiment of the “video / audio output selection process”, when the reception state of terrestrial digital broadcasting deteriorates, the video / audio to be output is selected according to the priority order of selection candidates previously designated by the user. Switch to the audio source. As described above, the selection candidates to be switched to and the priority order thereof can be set, so that the video / audio source (CD drive 23b, DVD drive 23c, digital audio player 23d, etc.) that requires a storage medium when outputting video / audio is used. On the other hand, selection candidates that cannot be used due to reasons such as no storage medium being inserted can be skipped and the next priority video / audio source can be selected. Accordingly, reliability can be further improved by not selecting an unusable video / audio source while reflecting user preferences.

  On the selection candidate setting screen 50 (see FIG. 3), when a video / audio source that requires a storage medium for video / audio output is designated as a selection candidate from the video / audio source list 51, this designation is made. A selection candidate having a lower priority than the selected selection candidate is continuously received. When a video / audio source (AM / FM tuner 23e, etc.) that does not require a storage medium for video / audio output is designated as a selection candidate, the video / audio source list 51 is made inoperable. Selection candidates that have a lower priority than the designated video / audio source are not accepted. For video / audio sources that do not require the insertion of a storage medium, such as the AM / FM tuner 23e, it is considered that it can always be used regardless of whether or not the storage medium is inserted. There is no need to specify candidates. Therefore, when such a video / audio source is designated as a selection candidate, unnecessary reception for the user can be saved by not performing subsequent reception.

[Another embodiment]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in various modes as long as they belong to the technical scope of the present invention.

  For example, instead of switching the video / audio output from digital terrestrial broadcasting to another video / audio source in the “video / audio output selection process” of S60 in the above-mentioned “output switching process” (see FIG. 2), terrestrial digital You may make it switch to the other channel of broadcast. The channel to be switched to may have a good reception state, or a plurality of channels with a good reception state may be simultaneously displayed on the display device 25, and the user may select from these.

  Alternatively, the above-described “video / audio output selection process” may be configured such that the first embodiment and the second embodiment are used together. Specifically, when the reception state of the terrestrial digital broadcast deteriorates, if the video / audio source selected before the terrestrial digital broadcast is selected can be output, the video / audio source is switched. On the other hand, if the video / audio source selected before the digital terrestrial broadcast is not selected due to the storage medium not being inserted or the like, the priority is higher from the selection candidates specified in advance by the user and the video / audio source is selected. Select a video / audio source that can output audio, and switch to this video / audio source.

  Note that the present invention can be realized not as an AV-integrated navigation device as in the above-described embodiment but also as an in-vehicle AV system. In this case, there is no navigation data stored in the position detector 21 or the external storage device 24 in the in-vehicle AV integrated navigation device 1 of the above embodiment.

1 is a block diagram showing a schematic configuration of an in-vehicle AV integrated navigation device 1 of an embodiment. 4 is a flowchart showing a procedure of “output switching processing” executed by the navigation ECU 29 of the in-vehicle AV integrated navigation device 1. It is explanatory drawing which shows typically an example of the procedure for setting the selection candidate of the video / audio source of a switching destination. 7 is a flowchart showing a procedure of “video / audio output selection processing (second embodiment)” executed by the navigation ECU 29 of the in-vehicle AV integrated navigation device 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... In-vehicle AV integrated navigation device 1, 21 ... Position detector, 22 ... Operation switch group, 23 ... Audio unit, 23a ... Terrestrial digital broadcast receiver, 23b ... CD drive, 23c ... DVD drive, 23d ... Digital audio Player, 23e ... AM / FM tuner, 24 ... External storage device (HDD), 25 ... Display device, 26 ... Audio amplifier, 27 ... Speaker, 28a ... CD, 28b ... DVD, 28c ... Memory card, 29 ... Navigation ECU.

Claims (6)

Receiving means for receiving terrestrial digital broadcasting;
Output means for selectively outputting video / audio by terrestrial digital broadcasting received by the receiving means, and video / audio by other various video / audio sources;
The video / audio output by the output means comprises selection means for selecting from the terrestrial digital broadcasting and the various video / audio sources,
The selection means selects the video / audio output by the output means before the terrestrial digital broadcast is selected when the reception state of the reception means deteriorates during the output of the video / audio by the terrestrial digital broadcast. An on-vehicle video / audio system characterized by selecting the video / audio source that has been provided. Receiving means for receiving terrestrial digital broadcasting;
Output means for selectively outputting video / audio by terrestrial digital broadcasting received by the receiving means, and video / audio by other various video / audio sources;
Selection means for selecting the video / audio output by the output means from the terrestrial digital broadcasting and the various video / audio sources;
Setting means for setting selection candidates by the selection means and their priority order from the various video / audio sources based on instructions from the user;
When the reception means of the receiving means deteriorates during the output of the video / audio by the terrestrial digital broadcasting, the selection means is selected from the selection candidates set by the setting means as the video / audio output by the output means, An in-vehicle video / audio system characterized by selecting the video / audio source having a high priority and capable of outputting video / audio. The in-vehicle video / audio system according to claim 2,
When the video / audio source that requires insertion of a predetermined storage medium storing video / audio data is output as a selection candidate when the video / audio is output, the setting means If the video / audio source that does not require the insertion of the predetermined storage medium is designated as a selection candidate when the selection candidate having a lower priority is continuously received and the video / audio is output, the designated candidate is designated. An in-vehicle video / audio system characterized by not accepting selection candidates that have lower priority than video / audio sources. In the in-vehicle video / audio system according to claim 2 or 3,
When the reception state of the receiving unit deteriorates during the output of the video / audio by the terrestrial digital broadcast, the selection unit selects the video / audio by the video / audio source selected before the terrestrial digital broadcast is selected. When audio output is possible, select this video / audio source, and when the video / audio output by the video / audio source selected before the digital terrestrial broadcasting is selected is impossible, the setting An in-vehicle video / audio system, wherein the video / audio source having a high priority and capable of outputting video / audio is selected from the selection candidates set by the means. The in-vehicle video / audio system according to any one of claims 1 to 4,
The selection means recovers the reception state of the reception means after selecting another video / audio source when the reception state by the reception means deteriorates during the output of the video / audio by the terrestrial digital broadcasting In this case, the on-vehicle video / audio system is characterized in that the terrestrial digital broadcasting is selected again.   A program for controlling a computer used in the in-vehicle video / audio system according to claim 1, wherein the computer functions as the selection unit in the in-vehicle video / audio system. Program for.

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