JP2007018618A - Onboard acoustic image system, onboard acoustic image device, and method and program for controlling onboard acoustic imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operability when a medium to be played is selected. <P>SOLUTION: The onboard acoustic image system 1 is provided with a plurality of media players 3 for playing media, and plays identical or different media in the front and rear sides of a cabin. An audio microcomputer 11 limits media to be selected by the other according to a predetermined medium when playing of the predetermined medium of one of the front and rear side is selected, and turns off the playing operation of the other medium when this limit is lifted to enable media selection targeting all the media in one of the front and rear sides. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-vehicle audiovisual system, an in-vehicle audiovisual apparatus, a control method thereof, and a control program that are mounted on a vehicle.

Conventionally, it has a plurality of media playback devices installed in the passenger compartment, and media is selected on each of the front side and the rear side of the passenger compartment, and the same or different media on the front and rear sides. There is known a system that can reproduce the video (for example, see Patent Document 1). In such a system, there are cases where there are restrictions on the combinations of media that can be selected on the front side and the rear side. Specifically, a combination in which noise is generated when media selected on the front side and the rear side are simultaneously played back, or a DVD / CD in which, for example, the media playback device plays back one of a CD and a DVD, for example. In the case of a playback apparatus, a combination of simultaneously selecting a CD and a DVD on the front side and the rear side is possible.
JP 2003-89330 A

  However, if there are restrictions on the combinations of media that can be selected on the front side and the rear side, when selecting media on either the front side or the rear side, the selectable media is selected on the other side. There are cases where a desired medium cannot be selected because of restrictions depending on the medium. In this case, there has been a problem that a desired medium cannot be selected unless the medium selected on the other side is changed, and the operability when selecting a medium to be reproduced is poor.

  The present invention has been made in view of the above-described circumstances, and includes an in-vehicle audio / video system, an in-vehicle audio / video apparatus, and an in-vehicle audio / video apparatus that can improve operability when selecting a medium to be reproduced. It is an object to provide a control method and a control program for an on-vehicle audiovisual apparatus.

In order to achieve the above object, the present invention has a plurality of media playback devices for playing back media, and an on-vehicle audiovisual system for playing the same media or different media on the front side and the rear side of the passenger compartment. In the above, when the reproduction of a predetermined medium is selected on one of the front side or the rear side, a selection limiting unit that limits a medium that can be selected on the other side according to the predetermined medium, and the selection limiting unit Control means for releasing the restriction and enabling media selection for all media on one of the front side and the rear side, and turning off the media playback operation on the other side. Features.
In the present invention, the media playback device is an optical disc playback device that plays back an optical disc such as a DVD or CD, a TV receiver that receives TV, a radio receiver that receives radio, and digital music stored in a hard disk drive. It includes a hard disk player that plays back data and video data, a semiconductor memory playback device that plays back digital music data and video data stored in a semiconductor memory such as an MD, a memory card, and a memory stick.

Further, the present invention is the above invention, wherein the selection restricting unit is configured to detect a medium that interferes with the reproduction when the reproduction is performed simultaneously with the predetermined medium selected on the front side or the rear side. The reproduction is prohibited from being selected on the other side.
In the present invention, the trouble in reproduction includes, for example, a case where noise may occur in the reproduced sound due to circuit resonance or the like when simultaneous reproduction is performed.

Further, the present invention is the above invention, wherein the plurality of media playback devices include at least one multi-media playback device capable of exclusively playing back different types of media, and the selection restricting means includes the front side or the When playback of any of the media that can be played back by the multi-media playback device is selected on the rear side, among the media that can be played back by the multi-media playback device, The media playback is prohibited from being selected on the other side.
In the present invention, the multi-media playback device includes, for example, a DVD / CD playback device that exclusively plays back either a DVD or a CD, a TV tuner and a radio tuner, and exclusively a TV or radio. TV receivers to be reproduced are included.

  In the present invention, in the above invention, when media selection is possible for all media on the front side or the rear side, the media already selected on the other side is changed to a specific media. It is characterized by comprising media changing means.

  In order to achieve the above object, the present invention reproduces the same media or different media on the front side and the rear side of the passenger compartment based on playback signals from a plurality of media playback devices that play back media. In the in-vehicle audiovisual apparatus, when playback of a predetermined medium is selected on one of the front side or the rear side, a selection limiting unit that limits media that can be selected on the other side according to the predetermined medium; Control means for releasing the restriction by the selection restricting means to enable media selection for all media on one of the front side and the rear side and for turning off the media playback operation on the other side It is characterized by comprising.

  In order to achieve the above object, the present invention reproduces the same media or different media on the front side and the rear side of the passenger compartment based on playback signals from a plurality of media playback devices that play back media. In the control method of the in-vehicle audiovisual device, when playback of a predetermined medium is selected on one of the front side or the rear side, the media that can be selected on the other side are limited according to the predetermined medium, When the restriction is released and media selection is possible for all media on the front side or the rear side, the media playback operation on the other side is turned off. .

In order to achieve the above object, the present invention reproduces the same media or different media on the front side and the rear side of the passenger compartment based on playback signals from a plurality of media playback devices that play back media. In the control program for the in-vehicle audiovisual apparatus, when the reproduction of the predetermined medium is selected on one of the front side or the rear side, the on-vehicle audiovisual apparatus is selected on the other side according to the predetermined medium. A selection restriction means for restricting selectable media, and the restriction of the selection restriction means is canceled to enable media selection for all media on the front side or the rear side, and on the other side It is made to function as a control means which turns off the reproduction | regeneration operation | movement of the media of this.
The control program can be sold or provided by recording it on a recording medium such as a magnetic disk, an optical disk, or a magneto-optical disk, or by transmitting it through an electric communication line. .

  According to the present invention, when playback of a predetermined medium is selected on one of the front side and the rear side, the media that can be selected on the other side are restricted according to the predetermined medium, and this restriction is released. When media selection for all media on the front side or the rear side is possible, the media playback operation on the other side is turned off, so there is no restriction when selecting media. Operability can be improved. Further, even when a combination of media whose selection is to be restricted is selected, the media playback operation on the other side is turned off, so that there is no possibility that the media playback on one side will be hindered.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of an in-vehicle audio video system 1 (hereinafter simply referred to as “acoustic video system 1”) according to the present embodiment. The audio-visual system 1 has a two-zone function for playing the same media or different media in a main zone on the front seat (front) side and a sub-zone on the rear seat (rear) side of the passenger compartment. The DVD, TV, and VTR are used as media, and the same media or different media are selected in the subzone and the main zone so that each video and audio can be viewed.

  The configuration of the audio video system 1 will be described in detail. As shown in FIG. 1, the audio video system 1 includes an in-vehicle audio video device 2 that reproduces media in each of a main zone and a sub zone (hereinafter simply referred to as “acoustic video device 2”). And a plurality of media playback devices 3 wired to the audio / video device 2 and a rear monitor 4 disposed on the rear seat side of the passenger compartment and connected to the audio / video device 2 by wiring. The audio / video device 2 further includes a front monitor 10, an audio microcomputer 11, a video signal output unit 12A, an audio signal output unit 12B, a video signal switching unit 13, and an audio signal switching unit 14. The electronic volume circuit 15 and the amplifier 16 are provided.

  The front monitor 10 is a monitor device that is attached to a front portion of a passenger compartment, for example, an instrument panel, and displays various information such as an operation menu. A touch panel 10A is disposed on the monitor portion of the front monitor 10, and a plurality of button operators are disposed around the monitor portion, so that the front monitor 10 also functions as the operation unit 10B of the audio video apparatus 2, Operations on the front monitor 10 are output to the audio microcomputer 11.

The audio microcomputer 11 executes control of each part of the audio video apparatus 2 and various arithmetic processes, and incorporates a memory 11A such as a ROM and operates based on a control program stored in the memory 11A.
The video signal output unit 12 </ b> A outputs the video signal output from each of the plurality of media playback devices 3 to the video signal switching unit 13, and the audio signal output unit 12 </ b> B is provided for the plurality of media playback devices 3. The audio signal output from each is output to the audio signal switching unit 14.

  Here, in the present embodiment, as the media playback device 3, a TV receiver 3A, a DVD / CD playback device 3B, a memory stick playback device (M. STICK) 3C for playing back digital music data stored on a memory stick, HDD audio playback device (M.CATCHER) 3D for playing back digital music data stored in a hard disk drive, MD playback device 3E for playing back digital music data stored in an MD (mini disk), and recording on a cassette tape, etc. An analog reproduction device 3F for reproducing the reproduced sound is provided. Of these media playback devices 3, the TV receiver 3A and the DVD / CD playback device 3B are used as devices for playing back video, and video signals are received from the TV receiver 3A and the DVD / CD playback device 3B, respectively. Is output to the video system signal output unit 12A, and the audio signal is output to the audio system signal output unit 12B.

In the present embodiment, the TV receiver 3A has a VTR playback function and an AM / FM radio reception function in addition to the TV reception function, and a plurality of media such as a TV, an AM / FM radio, and a VTR are provided. It is configured as a multi-media playback device that plays exclusively.
Furthermore, the DVD / CD playback device 3B is also configured as a multi-media playback device that exclusively plays back any one of a plurality of different media such as a DVD and a CD.

The video signal switching unit 13 described above outputs video signals output to the front monitor 10 and rear monitor 4 between video signals such as TV video signals, VTR video signals, and DVD video signals based on control signals of the audio microcomputer 11. It is to switch.
Specifically, the video signal switching unit 13 includes a front-side video switching circuit 20A and a rear-side video switching circuit 20B, and a front-side video selection circuit 21A and a rear-side video selection circuit 21B.
The front-side video switching circuit 20A and the rear-side video switching circuit 20B are each supplied with a TV video signal, a VTR video signal, and a DVD video signal from the video signal output unit 12A and based on a control signal output from the audio microcomputer 11. Thus, one of the video signals is output to a subsequent circuit.

The front-side video selection circuit 21A is provided at the subsequent stage of the front-side video switching circuit 20A, and images the situation outside the vehicle (for example, the rear or side of the vehicle) together with the video signal from the front-side video switching circuit 20A. A CCD video signal is supplied from the CCD camera, and one of the video signals is selected and output to the front monitor 10 based on the control signal of the audio microcomputer 11.
On the other hand, the rear-side video selection circuit 21B is provided at the subsequent stage of the rear-side video switching circuit 20B, and a NAVI video input from a car navigation device (not shown) is supplied together with the video signal from the rear-side video switching circuit 20B. On the basis of the control signal of the audio microcomputer 11, any video signal is selected and output to the rear monitor 4.

  That is, the video displayed on the front monitor 10 is determined as one of TV video, VTR video, DVD video, and CCD video according to the switching / selection state of the front video switching circuit 20A and the front video selection circuit 21A. The video displayed on the rear monitor 4 is one of TV video, VTR video, DVD video, and NAVI video depending on the switching / selection state of the rear video switching circuit 20B and the rear video selection circuit 21B. It is determined.

  When the audio video apparatus 2 is in a power-off state, the video signal output unit 12A and the audio signal output unit 12B are stopped, and TV video, VTR video, and DVD video to the front monitor 10 and the rear monitor 4 are stopped. However, the CCD video input and the NAVI video input can be continued. Therefore, even when the power of the audio video apparatus 2 is cut off, the CCD video can be displayed on the front monitor 10 or the NAVI video can be displayed on the rear monitor 4.

  The audio signal switching unit 14 described above selects one of the TV audio signal, VTR audio signal, and DVD audio signal output from the audio signal output unit 12B based on the control signal from the audio microcomputer 11. This is output to the electronic volume circuit 15, and includes first and second switching circuits 14A and 14B. The first switching circuit 14A receives a TV audio signal and a VTR audio signal, and outputs either one of the audio signals to the second switching circuit 14B based on a control signal from the audio microcomputer 11. The switching circuit 14B receives the audio signal from the first switching circuit 14A and the DVD audio signal, and outputs one of the audio signals to the electronic volume circuit 15 based on the control signal from the audio microcomputer 11. is there.

  The electronic volume circuit 15 adjusts the gain of the audio signal output from the audio signal switching unit 14, and further converts it to an analog audio signal and outputs it to the amplifier 16 when a digital audio signal is input The amplifier 16 amplifies the analog audio signal input from the electronic volume circuit 15 with the amplification factor instructed by the audio microcomputer 11 and outputs the amplified signal to the rear monitor 4.

The rear monitor 4 incorporates a speaker (not shown), and the audio signal output from the amplifier 16 is emitted from the speaker of the rear monitor 4 toward the rear seat. In addition, a connector 4A is provided around the monitor portion of the rear monitor 4, and headphones can be connected to the connector 4A to enjoy sound. Furthermore, by outputting an instruction signal for making the amplification factor substantially zero from the audio microcomputer 11 to the amplifier 16, it is possible to turn off (mute) the audio output on the rear seat side.
In FIG. 1, the audio output circuit to the front side is not shown, but the audio signal supplied from each of the audio video reproduction devices 3 </ b> A to 3 </ b> F is supplied to the audio video device 2 based on the audio microcomputer 11. A front-side audio signal switching unit for switching and selecting and outputting, an electronic volume circuit to which an audio signal is supplied from the audio signal switching unit, and an amplifier to which an audio signal is supplied from the electronic volume circuit are incorporated. The audio signal output from the amplifier is output to a speaker disposed on the front side of the passenger compartment, and the audio is output to the front side.

  In the audio / video system 1 configured as described above, the media selection menu 50 displayed on the front monitor 10 is operated to reproduce in each of the main zone (front side) and the sub-zone (rear side). The media is to be selected.

  FIG. 2 is a diagram schematically showing the media selection menu 50. As shown in this figure, the media selection menu 50 is divided into upper and lower screens, and a plurality of media selection buttons 51 for selecting in the main zone (front side) are displayed in the upper area 50A. In the side area 51B, a plurality of media selection buttons 52 for selecting in the subzone (rear side) are displayed. The media selection menu 50 is provided with a “2-ZONE” button 53 for instructing the validity / invalidity of the two-zone function. When the 2-zone function is activated by touching the “2-ZONE” button 53, the “2-ZONE” button 53 is lit to notify that the 2-zone function is activated. Further, the sub zone media selection button 52 becomes operable as the two zone function is activated.

  The media selection button 51 in the main zone includes an FM / AM selection button 51A, a DVD / CD selection button 51B, an MD selection button 51C, M.M. CATCHER selection button 51D, M.M. A STICK selection button 51E, a TV selection button 51F, and an ANALOG selection button 51G are provided. When any one of the media selection buttons 51 is touched, the media playback device 3 that plays back the media corresponding to the media selection button 51 A playback instruction is sent from the audio microcomputer 11 and the media is played back in the main zone. At this time, when the DVD / CD selection button 51B or the TV selection button 51F is touched, a DVD video, a TV video, or a VTR video is displayed on the front monitor 10.

  On the other hand, as the media selection button 52 of the subzone, a TV / VTR selection button 52A and a DVD selection button 52B are provided, and the “2-ZONE” button 53 is touched to enable the 2-zone function, By touching any one of the media selection buttons 52A and 52B, the audio microcomputer 11 controls the video signal switching unit 13 and the audio signal switching unit 14 according to the media selection buttons 52A and 52B, and the TV receiver 3A. Alternatively, a playback instruction is sent to the DVD / CD playback device 3B, whereby the selected media is played back in the subzone.

Here, as shown in FIG. 3, in this embodiment, a combination of media that cannot be selected at the same time in the main zone and the subzone is stored in the memory 11A of the audio microcomputer 11 in advance. The microcomputer 11 is prohibited from selecting such a combination of media.
More specifically, in the present embodiment, the TV receiver 3A exclusively performs TV reception, radio reception and VTR playback, and the DVD / CD playback device 3B exclusively plays back DVD and CD. Therefore, the audio microcomputer 11 prohibits a combination of simultaneously selecting two of TV reception, radio reception, and VTR playback in the main zone and the sub zone, and a combination of simultaneously selecting DVD and CD.

  Therefore, when the 2-zone function is enabled, when the user selects any one of the TV, FM / AM radio, or VTR media of the TV receiver 3A in the main zone, the audio microcomputer 11 On the (rear side), the operation of the media selection button 52 corresponding to the media is disabled in order to prohibit the selection of media other than the media selected in the main zone among TV and VTR media. At this time, if FM / AM radio is selected in the main zone, selection of TV and VTR is prohibited in the subzone.

Similarly, when the user selects the CD of the DVD / CD playback device 3 as the medium in the main zone, the audio microcomputer 11 prohibits the DVD from being selected as the medium in the subzone (rear side). The operation of the DVD selection button 52B is invalidated.
Furthermore, even when the media in the main zone is selected again when the two-zone function is enabled and the media has already been selected in each of the main zone and the sub-zone, the audio microcomputer 11 The media that can be selected in the main zone are limited according to the media selected in the subzone.

In the present embodiment, the operation unit 10B of the front monitor 10 is provided with a power-off button. When the power-off button is operated, the audio microcomputer 11 of the audio visual device 2 It is configured to shift to a power-off state that turns off the output of each media playback device 3 to the subzone.
Further, when the media selection menu 50 is displayed on the front monitor 10 in this power-off state, the audio microcomputer 11 prohibits a specific combination of media from being selected in the main zone and the subzone. Without processing, regardless of the media selected in the subzone, any media can be selected for all media in the main zone. As a result, the source that can be selected in the main zone is not limited by the media selected in the sub-zone, so that the usability of the audio video apparatus 2 can be improved.

By the way, when all media can be selected in the main zone, the combination of media selected in the sub-zone and the main zone becomes a combination of media that should be prohibited, and the audio / video device 2 shifts to the power-on state. , There is a risk that media playback may be hindered.
Therefore, in the present embodiment, when the media can be selected for all media in the main zone, the audio microcomputer 11 turns off the 2-zone function, thereby reproducing the media in the sub-zone. Is turned off so that the playback operation of the media selected in the sub-zone is not started even when the audio-visual device 2 is powered on.

  Specifically, as shown in FIG. 4, the audio microcomputer 11 outputs the output of each media playback device 3 when the power button is operated to instruct the power-off of the audio visual device 2 (step S1: YES). Is turned off, and the audio visual apparatus 2 is turned off (POWER OFF) (step S2). Next, the audio microcomputer 11 turns off the two-zone function (2ZONE OFF) (step S3), turns off the playback operation of the media selected in the sub-zone, and the audio / video device 2 enters the power-on state. Sometimes, the playback operation of the media selected in the subzone is not started.

  Thereafter, when the user operates the operation unit 10B of the front monitor 10 to select the medium in the main zone, the audio microcomputer 11 displays the media selection menu 50 on the front monitor 10 (step S4). At this time, the audio microcomputer 11 can select all media in the main zone regardless of the media selected in the sub-zone without executing processing for prohibiting selection of media combinations that cause inconvenience. (Step S5).

  Next, the audio microcomputer 11 changes the medium selected in the sub-zone to a specific medium in order to prevent the two-zone function from being turned on by the user while the prohibited medium combination is set ( Step S6). Specifically, in the present embodiment, among the DVDs, TVs, and VTRs that are media selectable in the subzone, the prohibited combination is the smallest (preferably not the prohibited combination). .

  As described above, according to the present embodiment, the TV, FM / AM and VTR, or DVD / CD that can be played back by the TV receiver 3A in either the main zone (front side) or the sub zone (rear side). When one of the DVD and CD media that can be played back by the playback device 3B is selected, the audio microcomputer 11 prohibits media other than the media selected on the one hand from being selected on the other hand. Therefore, it is possible to prevent inconvenience in media reproduction due to the combination of media selected in the main zone and the sub zone.

  In particular, according to the present embodiment, when the audio video apparatus 2 is in the power-off state, the audio microcomputer 11 enables media selection for all media in the main zone, and the two-zone function. Since the media playback operation in the subzone is set to the off state by turning off the media, the media that can be selected in the main zone are not limited by the media selected in the subzone. Further, since the media playback operation in the subzone is turned off, the combination of media selected in the main zone and the subzone should be prohibited when the audio / video device 2 is powered on. Even in this case, the media playback operation is not started in the subzone, and the media playback in the main zone is not hindered.

  Further, according to the present embodiment, when media selection for all media is enabled in the main zone, the audio microcomputer 11 selects a media already selected in the sub-zone as a specific media (this implementation). In this embodiment, since the configuration is changed to DVD), the two-zone function is prevented from being turned on by the user while the combination of the prohibited media is maintained.

  Further, according to the present embodiment, the main functions of the present invention can be realized only by changing the control program executed by the audio microcomputer 11.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention.
For example, in the above-described embodiment, when the audio video apparatus 2 is in the power-off state, the 2-zone function is turned off, and the playback operation of the media selected in the sub-zone is turned off. Not only this but after the power-off state, until the time when the media selection menu 50 is displayed, for example, when the state of selecting the media in the main zone is entered, the 2-zone function is turned off. Also good.

  In the above-described embodiment, a combination in which different media among media that can be played back by the various media playback devices such as the TV receiver 3A and the DVD / CD playback device 3B are simultaneously selected in the main zone and the subzone is prohibited. However, the present invention is not limited to this. For simultaneous playback in the main zone and sub-zone, simultaneous selection of media combinations that cause noise in the playback video or playback sound due to circuit resonance or the like may be prohibited. good.

  In the above-described embodiment, media selection is possible for all media in the main zone (front side), but not limited to this, media selection for all media is possible in the sub-zone (rear side). Anyway.

It is a figure which shows the functional structure of the vehicle-mounted audio visual system which concerns on embodiment of this invention. It is a figure which shows a media selection menu. It is a figure which shows the combination of the media which should prohibit selection. It is a flowchart which shows operation | movement of the vehicle-mounted audio visual apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 In-vehicle audiovisual system 2 In-vehicle audiovisual apparatus 3 Media playback device 3A TV receiver (multi-media playback device)
3B DVD / CD playback device (multi-media playback device)
10 Front monitor 10A Touch panel 11 Audio microcomputer 51, 52 Media selection button

Claims (7)

In an in-vehicle audiovisual system that has a plurality of media playback devices for playing back media and plays back the same media or different media on the front side and rear side of the passenger compartment,
Selection limiting means for limiting media that can be selected on the other side according to the predetermined medium when playback of the predetermined medium is selected on one of the front side or the rear side;
Control means for releasing the restriction by the selection restriction means to enable media selection for all media on one of the front side and the rear side, and for turning off the media playback operation on the other side; An on-vehicle audiovisual system comprising: The selection restriction means that, when playback is performed simultaneously with a predetermined medium selected on one of the front side and the rear side, playback of the media that interferes with the playback is selected on the other side. The on-vehicle audiovisual system according to claim 1, which is prohibited. The plurality of media playback devices include at least one multi-media playback device capable of exclusively playing back different types of media,
The selection restricting unit is configured to select a media that can be played back by the multi-media playback device when playback of any media that can be played back by the multi-media playback device is selected on the front side or the rear side. 3. The in-vehicle audiovisual system according to claim 1, wherein playback of media other than the media selected on the one side is prohibited from being selected on the other side. Media change means for changing media already selected on the other side to a specific medium when media selection for all media on one of the front side and the rear side is made possible; The on-vehicle audiovisual system according to any one of claims 1 to 3. In the in-vehicle audio / video apparatus that plays the same media or different media on the front side and the rear side of the passenger compartment based on playback signals from a plurality of media playback devices that play back media,
Selection limiting means for limiting media that can be selected on the other side according to the predetermined medium when playback of the predetermined medium is selected on one of the front side or the rear side;
Control means for releasing the restriction by the selection restriction means to enable media selection for all media on one of the front side and the rear side, and for turning off the media playback operation on the other side; An on-vehicle audiovisual apparatus comprising: In a control method for an in-vehicle audio / video apparatus that plays the same media or different media on the front side and the rear side of the passenger compartment based on playback signals from a plurality of media playback devices that play back media,
When playback of a predetermined medium is selected on one of the front side or the rear side, media that can be selected on the other side are limited according to the predetermined medium,
When the restriction is released and media selection is possible for all media on the front side or the rear side, the media playback operation on the other side is turned off. A method for controlling an on-vehicle audiovisual apparatus. In a control program for an on-vehicle audiovisual device that plays the same media or different media on the front side and the rear side of the passenger compartment based on playback signals from a plurality of media playback devices that play back media,
The in-vehicle audiovisual apparatus is
Selection restriction means for restricting media selectable on the other side according to the predetermined medium when reproduction of the predetermined medium is selected on one of the front side or the rear side, and
Control means for releasing the restriction of the selection restriction means to enable media selection for all media on one of the front side and the rear side, and turning off the media playback operation on the other side Control program to make it function.

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