JP2005197891A - System and method for av reproducing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide "an AV reproducing system and an AV reproducing method" capable of improving convenience of a user by enabling checking contents recorded in this medium, even in an AV reproducing apparatus such as a PC which has not authenticated with a removable medium. <P>SOLUTION: In the AV reproducing system provided with the removable medium and the AV reproducing apparatus having an AV output means, when the removable medium is connected to the AV reproducing apparatus, an instruction of requesting a file of music etc. is transmitted from the reproducing apparatus (S12). If the reproducing apparatus has not authenticated with the removable medium, an editing prevention function for preventing copying and movement is given to the requested file of music etc. from the removable medium in response to this instruction (S26). In this reproducing apparatus, the contents of the transmitted file of music etc. is displayed via an AV output means (S13). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for reproducing music (Audio) / video (Video) data, and in particular, an information recording medium (hereinafter, “removable medium”) such as a removable hard disk drive (HDD) or a memory stick (registered trademark). AV reproduction adapted to use the data in consideration of the protection of the copyright embodied in the AV data between the AV (music / video) reproduction apparatus such as a personal computer and the like. The present invention relates to a system and an AV playback method.

  In recent years, digitalization of broadcasting services has progressed, and new services such as interactive services and storage-type services have begun, and AV devices have become networked due to network broadbandization and the like, and personal computers (hereinafter referred to as “PC” for convenience). Is also an AV device. Considering the next-generation data platform in such a current situation, conditions such as high-speed access, handling various information, and being able to handle AV devices and PCs in common are required. HDD is a typical information recording medium that satisfies such conditions, but it has a problem of lack of mobility. Therefore, recently, a removable HDD (removable HDD) has been proposed as a portable recording medium. This removable HDD is designed to be compatible with a wide range of applications such as AV equipment and PCs by standardizing the connector shape and file system and making it portable.

  Such a removable HDD is mounted on, for example, an in-vehicle AV controller (head unit). For example, by connecting the HDD removed from the head unit to a PC and using dedicated PC software, the PC can be changed to the HDD. Editing operations such as copying music files or copying music files recorded on the HDD to the PC can be performed. Further, not only music file data but also video data is being studied for similar usage.

  Music data or video data is recorded in a digital format on such a removable HDD, but digital music data or video data can be recorded and reproduced without deteriorating sound quality or image quality. Problems may arise from a point of view. For this reason, there is a demand for AV playback technology that does not infringe copyrights. As an example, dedicated PC software as described above is used.

As a technology related to the above-described conventional technology, for example, when recording data on an information recording medium, the recording device can be specified by recording a digital signature and a public key certificate. When reading data, the signature and public key certificate are checked for validity, the data recorder is specified, and the public key certificate etc. is confirmed to have not been tampered with, and the data is reproduced ( For example, see Patent Document 1).
JP 2002-236622 A

  As described above, in a conventional AV playback system using removable media (HDD or the like), editing work such as copying music files or the like between the HDD and the PC by using dedicated PC software, for example. Can be done. In this case, authentication is performed between the HDD and the PC when the HDD is connected to the PC. For example, a unique ID code and password are input to the user, compared with a pre-registered ID code and password, and authentication is performed when they match. If an HDD that has been authenticated once is connected to another PC (that is, a PC that has not been authenticated with the HDD) and used, re-authentication is required.

  However, in the conventional technology using dedicated PC software or the like, from the viewpoint of copyright protection, all data such as music files recorded on the HDD has been erased at the time of re-authentication. If re-authentication is not performed, communication connection with the HDD cannot be established, so the music file recorded on the HDD can be listened to, and the contents of the music file (for example, song name, artist name, etc.) There was an inconvenience that it could not even be confirmed.

  As described above, in the conventional AV playback system using a removable medium, the contents of the HDD can be confirmed only by one PC authenticated with the medium, which is inconvenient for the user.

  The present invention was created in view of the problems in the prior art, and enables an AV playback apparatus such as a PC that has not been authenticated with a removable medium to confirm the contents recorded in the medium. An object of the present invention is to provide an AV playback system and an AV playback method that can be convenient for the user.

  The present invention also provides an AV playback that can play back AV data recorded on the media in consideration of copyright protection even in an AV playback device such as a PC that is not authenticated with the removable media. It is an object to provide a system and an AV playback method.

  In order to solve the above-described problems of the prior art, according to one aspect of the present invention, a removable medium having a recording medium on which a music or video file is recorded, and an AV output means for outputting or displaying the music signal or video signal as audio When the removable media is connected to the AV playback device, the AV playback device transmits an instruction to request a music or video file and responds to the instruction. Then, when the AV playback device does not authenticate with the removable medium from the removable medium, the requested music or video file is provided with an edit prevention function that disables copying or moving. And the content of the music or video file transmitted is displayed on the AV playback device via the AV output means. AV reproduction system, characterized in Rukoto is provided.

  According to the AV playback system according to this aspect, when the AV playback device accesses the removable media to request a file such as music, the AV playback device authenticates with the removable media. If not done, the removable media is sent to the AV playback device with an edit prevention function that makes it impossible to copy or move the requested file such as music. As a result, even in an AV playback device such as a PC that is not authenticated with the removable media, the content of the file such as the music (for example, song name, artist name, etc.) is confirmed via the AV output means. can do. As a result, it is possible to satisfy the request for “confirming the contents recorded on the media” for the convenience of the user.

Further, in the AV playback device of the AV playback system, music data or video data included in the music or video file transmitted from the removable medium is transmitted at the bit rate lower than the original bit rate. Audio output or display may be performed via output means. In this case, the AV data recorded on the medium can be reproduced in consideration of copyright protection.

  According to another aspect of the present invention, in the AV playback system comprising a removable medium that records a music or video file and an AV playback device that outputs or displays the music signal or video signal as audio, the removable medium is provided. To the AV playback device, requesting a music or video file from the AV playback device to the removable media, and the AV playback device from the removable media to the AV playback device If the requested music or video file is not authenticated, it is sent with an edit prevention function that disables copying or moving to the requested music or video file, and the transmitted music or video file content is transmitted. An AV playback method is provided that displays on the AV playback device.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically shows the configuration of a music playback system as an embodiment of an AV playback system according to the present invention.

  The music playback system 30 according to the present embodiment includes a music playback device 10 such as a PC or an in-vehicle player, and a removable medium 20 (HDD in this embodiment). The music playback device 10 and the HDD 20 are: They are connected by a USB cable 3 via dedicated USB (Universal Serial Bus) terminals 1 and 2 provided for each.

  The music playback device 10 includes a main control unit 11 configured by a microcomputer or the like, an operation unit 12 having various operation keys for inputting operation instructions by a user, an LCD panel, an organic EL panel, and the like. A display unit 13, a communication control unit 14, a music data storage unit 15 for storing music data, a music data processing unit 16, an amplifier 17, and a speaker 18. Display of the display unit 13 is controlled by the main control unit 11, and information related to the contents of the music file recorded on the removable medium (HDD 20) is displayed on the display screen as information related to the present invention (for example, music Name, artist name, album name, etc.).

  Further, the communication control unit 14 basically has a function as an interface for controlling data exchange (in this case, music data) between the main control unit 11 and the removable medium (HDD 20). Yes. In other words, music data sent from the HDD 20 via the USB cable 3 is input via the communication control unit 14 and temporarily stored in the music data storage unit 15 based on control from the main control unit 11. On the other hand, the music data stored in the music data storage unit 15 is read out by the main control unit 11 as necessary and supplied to the music data processing unit 16 or via the communication control unit 14 as a USB cable. 3 is sent out. Further, as a function related to the present invention, an ID code and a password unique to the user or the music playback device 10 are stored in the communication control unit 14, and this ID code and password are used when accessing the HDD 20. And log in.

  The music data processing unit 16 basically decompresses (decodes) digital music data read from the music data storage unit 15 via the main control unit 11, and further performs digital / analog conversion. To generate an analog audio signal. Further, the music data processing unit 16 has a function of converting the music data read from the music data storage unit 15 to a bit rate lower than the original bit rate and outputting it based on the control from the main control unit 11. ing. The audio signal output from the music data processing unit 16 is amplified through the amplifier 17 and then output as sound through the speaker 18.

  On the other hand, the removable medium 20 includes a recording medium 21 (in this case, a hard disk) and a data read / write control unit 22 for controlling reading and writing of data with respect to the recording medium 21. In this embodiment, the removable medium (HDD 20) is mounted on an in-vehicle AV controller (head unit).

  The recording medium 21 of the removable medium 20 stores music file data compressed (encoded) using a predetermined audio signal compression technique as data related to the present invention. In this embodiment, since the HDD is used as the removable medium 20, it is compressed to music data with a sampling rate of 44.1 kHz and a bit rate of 128 kbps / 160 kbps / 192 kbps by, for example, MP3 (MPEG1 Audio Layer 3). Stored. Further, when a memory stick is used as another form of the removable medium 20, for example, compression is performed to music data with a sampling rate of 44.1 kHz and a bit rate of 105 kbps / 132 kbps by ATRAC3 (Adaptive TRansform Acoustic Coding 3). Stored. The music file stored in the recording medium 21 is added with information indicating the contents of the music file (music name, artist name, album name, etc.) as additional information other than music data (actual data).

  In addition, in the data read / write control unit 22, an ID code and a password of a user who is permitted to log in or the music playback device 10 are registered in advance. In the present embodiment, the data read / write control unit 22 requests an ID code and a password from the accessing external device (music playback device 10), and basically, the transmitted ID code and password are stored in advance. Login is permitted when it matches the registered ID code and password, and even if it does not match, login is permitted with conditions as will be described later.

  In the music playback system 30 according to the present embodiment configured as described above, the music playback device 10 corresponds to an “AV playback device”, and the display unit 13 and the speaker 18 correspond to “AV output means”.

  FIG. 2 shows various aspects related to transmission / reception and use of music files performed between the music playback device 10 (in this case, PC) and the removable medium 20 (in this case, HDD) in the music playback system 30 described above. is there.

  In FIG. 2, (a) illustrates the case where the authenticated HDD 20 is connected to the authenticated PC 10, and for example, the HDD 20 mounted on the head unit is connected to the PC (music playback device 10) on hand for authentication. After the music file is appropriately copied from the PC, the authenticated HDD 20 is removed from the vehicle and connected to the original PC (authenticated music playback device 10) again.

  On the other hand, FIG. 2B illustrates the case where the authenticated HDD 20 is connected to an unauthenticated PC 10. For example, the HDD 20 mounted on the head unit is connected to an in-vehicle player (music playback device 10). It is assumed that after authenticating and copying a music file from the player as appropriate, the authenticated HDD 20 is removed from the vehicle and connected to a PC in the room (that is, the music playback device 10 that has not been authenticated). ing.

  FIG. 3 shows an example of “reproduction at a low bit rate” in FIG. In the illustrated example, the PC 10 that has been authenticated is reproduced and output at the bit rate of a music file recorded on the HDD 20 (for example, the bit rate equivalent to a CD), and the PC 10 that has not been authenticated is recorded on the HDD 20. The music file is reproduced and output at a bit rate of about 1/2 (for example, a bit rate similar to that of AM radio). Reproduction output with a lower bit rate (that is, with degraded sound quality) is in consideration of copyright protection. However, under the Copyright Act, reproduction and output must always be performed with a lower bit rate. It is understood that there is no. That is, as illustrated in FIG. 2B, the contents (music name, artist name, album name, etc.) other than the music data of the music file recorded in the HDD 20 are confirmed, or the recorded music is only listened to. It is understood that there is no possibility of infringing the copyright if the usage mode is (editing of music files is prohibited).

  Hereinafter, in the music playback system 30 according to the present embodiment, processing related to transmission / reception and use of music files performed between the music playback device 10 (PC, in-vehicle player, etc.) and the removable media 20 (HDD) is shown in the processing flow. An example will be described with reference to FIG.

  First, as a precondition, the HDD 20 (removable medium) mounted on the head unit is connected to the in-vehicle player (music playback device 10) via the head unit for authentication, and a music file is appropriately copied from the player. Then, it is assumed that the authenticated HDD 20 is removed from the vehicle and newly connected to the music playback device 10. In this case, the music playback device 10 to be connected is the case of the original music playback device (in-vehicle player in this precondition) that has been authenticated as illustrated in FIG. 2), there are two possible cases in the case of another music playback apparatus (PC 10 in the illustrated example) that has not yet been authenticated.

  First, in the first step S21 (on the media side), when connected to the music playback device 10 via the USB cable 3, the data read / write control unit 22 uses an ID code and a password (referred to as “ID code etc.”). Request.

  In the next step S11 (reproduction device side), the communication control unit 14 transmits its own ID code stored in advance in response to a request from the medium 20 side.

  In the next step S22 (media side), in the data read / write control unit 22, the ID code or the like sent from the playback device 10 side matches the ID code or the like registered in advance (YES) ( NO). If the determination result is YES, that is, if the other player connected to the authenticated medium (HDD 20) is the original player (in-vehicle player) that has been authenticated, the process proceeds to step S23 and login is performed. to approve.

  On the other hand, if the determination result is NO, that is, if the other-side playback device connected to the authenticated medium (HDD 20) is another playback device that has not yet been authenticated (for example, a PC in the room), the step Proceeding to S24, login is permitted under certain conditions. For example, it is notified that only the confirmation of the content of the music file recorded on the medium (HDD 20) and the reproduction of the music data are permitted. If the ID code or the like registered in advance does not match, conventionally, re-authentication is performed with the playback device side, and all the music files recorded on the HDD are erased during this re-authentication. However, in the present invention, it remains in the HDD without being erased.

  In the next step S12 (playback apparatus side), the music file recorded on the medium (HDD 20) by the main control unit 11 through the communication control unit 14 based on the input operation by the user through the operation unit 12 Send an instruction to request.

  In the next step S25 or S26 (media side), in response to a request from the playback device 10, the data read / write control unit 22 authenticates the playback device on the other side based on the determination result made in step S22. If it is, the music file is read from the recording medium 21 and transmitted as it is (step S25). If the other player is not authenticated, the music file is copied to the music file read from the recording medium 21. And an editing prevention function for disabling movement (step S26). Then, the processing flow on the medium 20 side is “end”.

  In the next step S13 (playback apparatus side), the main control unit 11 receives the music file (data) transmitted from the medium 20 side via the communication control unit 14, and the data is stored in the music data storage unit 15. Once stored, the contents of the music file (music name, artist name, album name, etc.) are displayed on the screen of the display unit 13. Further, the music data of the music file is read from the music data storage unit 15 and supplied to the music data processing unit 16, and the signal processing (decompression processing, digital / analog conversion, conversion to a low bit rate, etc.) is performed as appropriate in the processing unit 16. ) And further amplified through the amplifier 17, and then reproduced and output from the speaker 18 at the original bit rate (or a low bit rate as illustrated in FIG. 3). Then, the processing flow on the playback device 10 side is “end”.

  As described above, according to the music playback system 30 according to the present embodiment, when there is an access from the music playback apparatus 10 to request a music file to the removable medium (HDD 20), the music playback apparatus The requested music file is distributed to the music playback apparatus 10 regardless of whether the music playback apparatus 10 is authenticated with the HDD 20 or not. However, if the music playback device 10 has not authenticated with the HDD 20, the music playback device 10 is provided with an edit prevention function that disables copying or moving to the requested music file. It will be delivered. In this way, even in a music playback device 10 such as a PC that has not been authenticated with the HDD 20, the contents of the music file (for example, a song name, an artist name, etc.) are confirmed through the screen of the display unit 13. be able to. As a result, the convenience of the user can be achieved and the user's request to “confirm the contents recorded in the HDD 20” can be satisfied.

  Regardless of whether or not the music playback device 10 that has accessed the removable media (HDD 20) is an authenticated music playback device with the HDD 20, the music file is distributed to the music playback device 10. Therefore, even in a music playback device 10 such as a PC that is not authenticated with the HDD 20, the music data contained in the music file is transmitted at the original bit rate via the speaker 18. Alternatively, reproduction and output can be performed at a low bit rate in consideration of copyright protection.

  In the above-described embodiment, a music file (data) has been described as an example of information to be played back on the music playback device 10 side such as a PC. Of course, the data may be video data. As an example of the case where the information to be reproduced is video data, for example, it is recorded on a DVD unit with a copy control function or a protect function, carried by itself, and seen when connected to a PC (video playback device). The case where it is made like this can be considered.

  In the above-described embodiment, the HDD 20 has been described as an example of a removable medium connected to the music playback device 10, but the removable medium is not limited to this, and for example, a memory stick or the like may be used. Of course.

1 is a block diagram schematically showing the configuration of a music playback system as an embodiment of an AV playback system according to the present invention. It is a figure which shows the various aspects regarding transmission / reception and utilization of a music file performed between a music reproduction apparatus and a removable medium in the system of FIG. FIG. 3 is a diagram illustrating an example of “reproduction at a low bit rate” in FIG. It is a flowchart which shows an example of the process which concerns on transmission / reception and utilization of the music file performed between a music reproduction apparatus and a removable medium in the system of FIG.

Explanation of symbols

3 ... USB cable,
10 ... music playback device (AV playback device),
11 ... main control unit,
13: Display unit (AV output means),
14 ... communication control unit,
15 ... music data storage unit,
16 ... music data processing unit,
18 ... Speaker (AV output means),
20 ... Removable media,
21. Recording medium,
22: Data read / write control unit,
30 ... Music playback system (AV playback system).

Claims (6)

A removable medium having a recording medium for recording music or video files;
An AV playback device including AV output means for outputting or displaying a music signal or a video signal as audio, and
When the removable media is connected to the AV playback device, the AV playback device transmits an instruction to request a music or video file,
In response to the instruction, when the AV playback device does not authenticate with the removable medium from the removable medium, the editing prevention that disables copying or moving to the requested music or video file Send with function,
In the AV playback device, the content of the music or video file transmitted is displayed via the AV output means.   The requested music or video file is transmitted as it is from the removable media to the AV playback device when the AV playback device authenticates with the removable media. The AV playback system according to claim 1.   2. The AV playback apparatus according to claim 1, wherein music data or video data included in the music or video file transmitted from the removable medium is output or displayed through the AV output means. 2. The AV playback system according to 2.   In the AV playback device, music data or video data included in the music or video file transmitted from the removable medium is output as audio through the AV output means at a bit rate lower than the original bit rate. The AV playback system according to claim 1, wherein the AV playback system is displayed. In an AV playback system comprising a removable medium in which a music or video file is recorded and an AV playback device for outputting or displaying a music signal or video signal as audio,
Connecting the removable media to the AV playback device, requesting a music or video file from the AV playback device to the removable media,
Editing that disables copying or moving to the requested music or video file when the AV playback device does not authenticate with the removable media from the removable media to the AV playback device Send with prevention function,
An AV playback method, wherein the content of the music or video file transmitted is displayed on the AV playback device.   In the AV playback apparatus, the music data or video data included in the music or video file transmitted from the removable medium is output or displayed at the original bit rate or at a bit rate lower than the original bit rate. The AV playback method according to claim 5, wherein

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