JP4201510B2 - Digital memory player - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital memory player that can read data from a recording medium and reproduce music contents.
[0002]
[Prior art]
Conventionally, a digital memory player using a multimedia card (hereinafter referred to as MMC) as a recording medium is known.
As shown in FIG. 5, the MMC capable of reproducing music content by the digital memory player includes a music content file (51) including encrypted music data for each music content, and the music content file (51 The license file (61) necessary for decrypting the encrypted data (1) is recorded as a pair. Hereinafter, the paired music content file (51) and license file (61) are collectively referred to as a content / license file (71). Each music content file (51) includes file information such as a song name.
[0003]
In the memory of the digital memory player, as shown in FIG. 6, a list composed of the file number and the song name for each content / license file is created. When playing music content, a desired music content is selected from the list. I can do it.
That is, according to the user's operation, the music names included in the list are sequentially displayed on the liquid crystal display unit of the digital memory player, and when the user selects the music name of the desired music content, the selected music content is selected. Based on the file number of the name, the corresponding content / license file (music content file and license file) is read from the MMC. Then, the read music content file data is decrypted using the read license file data, thereby reproducing the music content.
[0004]
The contents / license file that is no longer needed from the MMC can be deleted by specifying an unnecessary song name from among the song names displayed on the liquid crystal display unit of the digital memory player, or by using a personal computer ( (Hereinafter referred to as PC), and there is a method of designating an unnecessary music name from the music names displayed on the PC screen.
In the erasing method using the display on the liquid crystal display unit of the digital memory player, the music titles included in the list shown in FIG. 6 are sequentially displayed on the liquid crystal display unit of the digital memory player in accordance with a user operation. When the user selects the name of the music content to be deleted, the corresponding content / license file is deleted from the MMC based on the file number of the selected music name.
[0005]
On the other hand, in the erasing method using the display on the screen of the PC connected to the digital memory player, all the music content files and license files recorded on the MMC are listed on the PC screen by executing the browsing software. When the user selects a file to be deleted and performs an erasing operation, the selected file is deleted from the MMC.
[0006]
By the way, when deleting a file using a PC connected to a digital memory player, as shown in FIG. 7, the license file (61) of the content / license file (71) stored in the MMC is left and the music content is stored. Only the file (51) may be deleted. In such a case, the music content file (51) does not exist in the remaining content / license file (71), so the music content cannot be played back. .
[0007]
Also, for some reason, the music / content file (51) and / or the license file (61) recorded in the MMC as shown in FIG. There may be. If a part of the music data of the music content file (51) is damaged, the music content cannot be reproduced normally. When a part of the data of the license file (61) is damaged, the music data cannot be reproduced because the music data of the music content file (51) cannot be decrypted.
[0008]
In addition, as a music content distribution method, it is possible to download a music content file with encrypted data and to copy music content files between MMCs between users, and to purchase a license file by a predetermined method. ing. In the music content distribution method, as shown in FIG. 9, although the music content file (51) downloaded or copied is recorded in the MMC, the license file (61) to be paired with the music content file (51) is shown. ) May not have been purchased. In such a case, since the license file (61) does not exist, the music data of the music content file (51) cannot be decrypted and the music content cannot be reproduced.
[0009]
Since the content / license file (hereinafter referred to as invalid content / license file) (71) that cannot reproduce the music content as described above consumes the recording capacity of the MMC in a wasteful manner, It is desirable to delete the content / license file (71) from the MMC.
[0010]
[Problems to be solved by the invention]
However, in the file erasing method using the display on the liquid crystal display unit of the digital memory player, the names of music contents to be erased are displayed based on the list shown in FIG. Although the first purpose is to display the music title of the target music content and it does not include an invalid content / license file, it is possible to select a normal content / license file. Unable to select invalid content / license file. Therefore, the invalid content / license file cannot be erased by the file erasing method using the display on the liquid crystal display unit of the digital memory player.
[0011]
On the other hand, in the file erasing method using a PC connected to the digital memory player, all files stored in the MMC are displayed on the screen regardless of whether the content / license file is normal or invalid. The content / license file can be erased, but it is necessary to connect the digital memory player to the PC every time it is erased.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to enable invalid contents / license files to be deleted by a simple operation and to effectively use the recording capacity of the MMC.
[0012]
[Means for solving the problems]
A digital memory player according to the present invention includes:
Depending on the file search command, one of the music content file and the license file in a pair is missing or at least one of the plurality of content / license files recorded on the recording medium. A file search means for searching for a content / license file whose data in one file is damaged;
List creation means for creating a list including file information of each content / license file for one or a plurality of retrieved content / license files;
A list display means for displaying the created list;
File erasing means for erasing selected one or more contents / license files from the recording medium in response to a user operation to select one or more contents / license files from the list displayed on the list display means
And has.
[0013]
In the above-described digital memory player of the present invention, when an invalid content / license file recorded on a recording medium is to be deleted, the user operates the operating device to issue a file search command. In response to this, the file search means searches for an invalid content / license file recorded on the recording medium. When an invalid content / license file is found in this way, the list creation means creates a list including file information of the invalid content / license file. The created list is displayed by list display means. Therefore, when the user selects an invalid content / license file to be deleted from the displayed list, the file erasing unit deletes the selected invalid content / license file from the recording medium.
[0014]
In a specific configuration,
A file recording means for receiving the music content file in response to the download of the music content file from the external device and recording it on a recording medium;
A data amount recognizing means for receiving information on the data amount of the music content file from an external device upon downloading the music content file, and recognizing the data amount of the music content file based on the information;
Data amount comparison means for comparing the recognized data amount with the free space of the recording medium;
Recording command means for instructing the file recording means to receive and record a music content file downloaded from an external device when it is determined that the recognized amount of data is less than the free capacity of the recording medium;
Search command means for instructing the file search means to execute search when it is determined that the recognized amount of data is larger than a free space of a recording medium;
Comparison command means for instructing the data amount comparison means to perform a comparison operation after one or more contents / license files are erased by the file erasure means
And has.
[0015]
In this specific configuration, when a user performs an operation for downloading music content file data from an external device such as a personal computer to a digital memory player, first, the data amount recognition means first sets the data amount of the music content file. Is received from an external device, and the data amount of the music content file is recognized based on the information. Subsequently, the data amount comparison means compares the recognized data amount with the free capacity of the recording medium at that time. When it is determined that the recognized data amount is equal to or less than the free capacity of the recording medium, the recording command unit is instructed to receive and record the music content file downloaded from the external device.
[0016]
On the other hand, when it is determined that the recognized amount of data is larger than the free capacity of the recording medium, the search by the file search means is executed in response to the file search command from the search command means. When an invalid content / license file is found in this way, the list creation means creates a list including file information of the invalid content / license file. The created list is displayed by list display means. Therefore, when the user selects an invalid content / license file to be deleted from the displayed list, the file erasing unit deletes the selected invalid content / license file from the recording medium. As a result, the free capacity of the recording medium increases.
[0017]
Thereafter, the comparison command means instructs the data amount comparison means to compare, and accordingly, the data amount of the music content file to be downloaded and the free space of the recording medium are compared again, When the amount of data becomes equal to or less than the free space due to the increase of the free space, the music content file is received and recorded according to the download.
[0018]
Therefore, even when the free space of the recording medium is insufficient when downloading the music content file, the free space of the recording medium is increased by deleting the invalid content / license file recorded on the recording medium. A new music content file can be recorded on the medium.
[0019]
In another specific configuration, the list created by the list creation means includes information regarding the presence / absence of a music content file and information regarding the presence / absence of a license file for each content / license file.
[0020]
According to the specific configuration, based on the display of the list, the user can determine the reason for the invalid content / license file because the data of at least one of the music content file and the license file is damaged. Or one of the music content file and the license file is missing.
Therefore, when deleting the invalid content / license file, the user deletes or leaves the invalid content / license file in consideration of the conditions for eliminating the reason for invalidation, such as purchase of a license file. You can decide whether to leave.
[0021]
【The invention's effect】
According to the digital memory player of the present invention, the user can erase invalid contents / license files with a simple operation without connecting to a PC, thereby increasing the free space of the recording medium, Effective use of the recording capacity of the recording medium can be achieved.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, the digital memory player (1) according to the present invention records data in the MMC (8) by mounting the MMC (8) serving as a recording medium, or from the MMC (8). Data can be read out. The digital memory player (1) is connected to the PC (3) via the USB cable (31) or connected to the mobile phone (2) via the RS-232C cable (21). Data can be downloaded from (3) or the mobile phone (2).
[0023]
The digital memory player (1) includes a control circuit (10) for executing a predetermined control operation, an interface (11) to which the MMC (8) is connected, and a digital audio signal output from the control circuit (10). A digital signal processor (hereinafter referred to as DSP) (12) for processing the signal, a D / A converter (13) for converting a digital audio signal obtained from the DSP (12) into an analog audio signal, and a D / A converter ( An amplifier (14) that amplifies the analog audio signal obtained from 13) and supplies it to the headphones (4), a real-time time clock (15) for the clock function, and various setting values even after the power switch is turned off EEPROM (16) for storing data, rechargeable battery (17) for supplying power to each circuit, liquid crystal display unit (19) for displaying various information, and various instructions by the user Enter to enter And it includes a device (18).
[0024]
The control circuit (10) is an MMC control block (10a) with a copyright protection function that controls reading of the content / license file recorded in the MMC (8) and writing of the content / license file to the MMC (8). Data transmission / reception to / from the PC (3) via the USB cable (31) or data transmission / reception to / from the mobile phone (2) via the RS-232C cable (21) Transmission / reception block (10b), an encryption / decryption block (10c) for encrypting or decrypting music data of a music content file, and a system control block (10d) for controlling the entire system. Yes.
[0025]
The MMC (8) includes, for each of a plurality of music contents, a pair of a music content file in which data is encrypted and a license file necessary for decrypting the data of the music content file. A license file is recorded.
When the MMC (8) is loaded into the digital memory player (1) in order to reproduce desired music contents from the MMC (8), the contents / license files that can reproduce the music contents are targeted as shown in FIG. A list including a file number and a song name for each content / license file is created.
[0026]
When the user operates the input device (18) to input an instruction for playing music content, the music name of each music content is sequentially displayed on the liquid crystal display unit (19) based on the list of FIG. The
Therefore, when the song name of the music content to be played is displayed and the user selects the song name by operating the input device (18), the selected song name is changed according to the selection operation. The content / license file with the corresponding file number is read from the MMC (8) and the read music file data is decrypted using the read license file data. The The digital audio signal thus obtained is supplied to the DSP (12), subjected to data processing necessary for reproduction, converted to an analog audio signal through a D / A converter (13), and an amplifier (14). To be supplied. The analog audio signal amplified by the amplifier (14) is output as music content from the headphones (4).
[0027]
The music content file can be downloaded from a music distribution site on the Internet to the digital memory player (1) via the PC (3) or the mobile phone (2).
For example, in downloading using the PC (3), a music content file is downloaded from the PC (3) to the digital memory player (1) via the USB cable (31), and the music data of the music content file is stored in the digital memory. It is recorded in the MMC (8) attached to the player (1).
[0028]
FIG. 2 shows a control procedure in which the digital memory player of the present invention receives the music content file and records it in the MMC in response to downloading of the music content file from the PC. The control procedure can be canceled at any step by the user operating the input device.
[0029]
When the user operates the PC to download a new music content file to the digital memory player, information on the data amount of the music content file from the PC to the digital memory player is transferred before the music content file is transferred. Is sent.
In response to this, in step S1, the digital memory player first receives information on the amount of data transmitted from the PC, and based on this information, the amount of music content file data to be downloaded. Recognize Next, in step S2, the recognized data amount is compared with the free space of the MMC to determine whether or not the recognized data amount is smaller than the free space of the MMC.
[0030]
If it is determined in step S2 that the recognized amount of data is smaller than the free space (yes), the process proceeds to step S18 to receive the music content file downloaded from the PC, and the music content file Is recorded in the MMC and the procedure is terminated.
[0031]
On the other hand, if it is determined in step S2 that the amount of data is larger (no) than the size of the free space, the process proceeds to step S3, where an invalid content / license file recorded in the MMC is stored. Command execution of search processing. As a result, in step S4, an invalid content / license file search process recorded in the MMC is executed.
[0032]
In the search process, first, a content / license file (71) in which data of at least one of the paired music content file (51) and license file (61) is damaged is searched as shown in FIG. To do. Next, as shown in FIG. 9, the content / license file (71) in which the license file (61) is missing is retrieved from the paired music content file (51) and license file (61). Finally, as shown in FIG. 7, the content / license file (71) in which the music content file (51) is missing is retrieved from the paired music content file (51) and license file (71).
Then, the total number of invalid contents / license files found by the search is set to cnt.
[0033]
Next, in step S5 of FIG. 2, it is determined whether or not the total number of invalid contents / license files cnt is 0. If it is determined that the total number of files cnt is 0 (yes), step S6 is performed. Migrate to
In step S6, a content / license file in which both the music content file and the license file that are paired normally are extracted from the content / license file recorded in the MMC, as shown in FIG. A play list including a file number and a file name is created for each content / license file.
[0034]
Thereafter, the process proceeds to step S7 in FIG. 2, and the music titles in the list are sequentially displayed on the liquid crystal display unit in accordance with the display operation of the user by the input device. Therefore, when the user selects the song name by operating the input device while the song name of the music content to be erased is displayed, the process proceeds to step S8, and the selected song name is erased from the list. At the same time, the content / license file of the selected music title is deleted from the MMC.
Subsequently, in step S9, the data amount of the music content file to be downloaded is compared with the free space of the MMC at that time to determine whether the data amount is smaller than the free space. If it is determined that the amount of data is larger than the free space (No), the process returns to step S7 to repeat the display of the song name and the deletion of the file. As a result, when it is determined in step S9 that the data amount is smaller than the free space (yes), the process proceeds to step S18 to receive the music content file downloaded from the PC, and the music content file Is recorded in the MMC and the procedure is terminated.
[0035]
On the other hand, if it is determined in step S5 that the total number of files cnt is not 0 (no), the process proceeds to step S10 to create a file information list for invalid content / license files.
As shown in FIG. 3, the list includes file number, song name information, information on the presence / absence of a music content file, and information on the presence / absence of a license file for each invalid content / license file in the searched order. ing.
[0036]
Next, in step S11 of FIG. 2, the file number n (initial value: 1) is compared with the total number of files cnt to determine whether the file number n is equal to or less than the total number of files cnt. If it is determined that the file number n is equal to or less than the total number of files cnt (yes), the process proceeds to step S12, and the file information of the invalid content / license file to which the file number n is attached is displayed on the liquid crystal display unit. indicate.
[0037]
4A, 4B, and 4C show display examples of file information on the liquid crystal display unit.
In the example of FIG. 4A, the file number n, the song name “AAA”, the information C that the music content file exists, and the information L that the license file exists are displayed. By this display, the user has recorded a pair of music content file and license file in the MMC, but the content / license file is invalid because the data of at least one of the files is damaged. I can recognize that.
In the example of FIG. 4B, the file number n, the song name “Ddd”, the information C that the music content file exists, and the information that the license file does not exist (blank) are displayed. By this display, the user can recognize that the content / license file is invalid because the license file is missing in the pair of music content file and license file.
Further, in the example of FIG. 4C, the file number n, the song name “BBb”, the information that the music content file does not exist (blank), and the information L that the license file exists are displayed. By this display, the user can recognize that the content / license file is invalid because the music content file is missing from the pair of music content file and license file.
[0038]
After displaying the file information of the file number n as described above, the process proceeds to step S13 in FIG. 2, and whether or not the user has operated the input device to instruct deletion of the invalid content / license file of the file number n. Judging.
If it is determined NO, the process proceeds to step S14, 1 is added to the file number n, and the process returns to step S11 to repeat the comparison of the file number n and the total number of files cnt. As a result, if it is determined in step S11 that the file number n is larger than the total number of files cnt (No), the process proceeds to step S6, where a reproduction list is created and the file is erased.
[0039]
If it is determined in step S13 that the user has issued an instruction to delete the invalid content / license file (yes), the process proceeds to step S15 to execute a process of deleting the invalid content / license file.
Thereafter, in step S16, a command is issued to compare the data amount of the content file to be downloaded and the free space of the MMC. Thereby, in step S17, the data amount is compared with the free space to determine whether the data amount is smaller than the free space. If it is determined that the amount of data is greater than or equal to the free space (No), the process proceeds to step S14, 1 is added to the file number n, and the process returns to step S11 to return the file number n and the file. The comparison of the total number cnt is repeated.
If it is determined in step S17 that the amount of data is smaller than the free space (yes), the process proceeds to step S18 to receive the music content file downloaded from the PC, and the music content file is transferred to the MMC. To complete the procedure.
[0040]
According to the above control procedure, when the free space of the MMC is smaller than the data amount of the content / license file to be recorded in the MMC, first, any invalid content / license file recorded in the MMC Next, any content / license can be deleted from normal content / license files in which both the music content file and the license file that are paired are recorded.
Therefore, the user need not connect the digital memory player to the PC when deleting the invalid content / license file, and the deletion operation is simple.
[0041]
Further, when deleting invalid contents / license files, the music title of invalid contents / license files, information regarding the presence / absence of music content files, and information regarding the presence / absence of license files are displayed on the liquid crystal display. When erasing invalid contents / license files, the user erases or leaves invalid contents / license files in consideration of conditions for eliminating the reason for invalidity, such as purchase of a license file. Can be determined.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a digital memory player according to the present invention.
FIG. 2 is a flowchart showing a control procedure of the digital memory player.
FIG. 3 is a diagram showing a list created in a file search process of the control procedure.
FIG. 4 is a diagram illustrating a display example of file information included in the list.
FIG. 5 is a diagram illustrating a configuration of a content / license file capable of playing music content.
FIG. 6 is a diagram showing a list of music names included in the content / license file.
FIG. 7 is a diagram illustrating a configuration of an invalid content / license file in which a music content file is missing.
FIG. 8 is a diagram illustrating a configuration of an invalid content / license file in which data of at least one of a music content file and a license file is damaged.
FIG. 9 is a diagram illustrating a configuration of an invalid content / license file in which a license file is missing.
[Explanation of symbols]
(1) Digital memory player
(10) Control circuit
(2) Mobile phone
(3) PC
(8) MMC

Claims (3)

A pair of a music content file in which data is encrypted and a license file necessary for decrypting the encrypted data of the music content file are recorded as a content / license file for each of a plurality of music contents. In a digital memory player that reads out one content / license file from a recording medium, decrypts the data of the music content file using the license file, and reproduces the music content,
Depending on the file search command, one of the music content file and the license file in a pair is missing or at least one of the plurality of content / license files recorded on the recording medium. A file search means for searching for a content / license file whose data in one file is damaged;
List creation means for creating a list including file information of each content / license file for one or a plurality of retrieved content / license files;
A list display means for displaying the created list;
File erasing means for erasing selected one or more contents / license files from the recording medium in response to a user's operation of selecting one or more contents / license files from the list displayed on the list display means; A digital memory player characterized by comprising: A pair of a music content file in which data is encrypted and a license file necessary for decrypting the encrypted data of the music content file are recorded as a content / license file for each of a plurality of music contents. In a digital memory player that reads out one content / license file from a recording medium, decrypts the data of the music content file using the license file, and reproduces the music content,
Depending on the file search command, one of the music content file and the license file in a pair is missing or at least one of the plurality of content / license files recorded on the recording medium. A file search means for searching for a content / license file whose data in one file is damaged;
List creation means for creating a list including file information of each content / license file for one or a plurality of retrieved content / license files;
A list display means for displaying the created list;
File erasing means for erasing selected one or more contents / license files from the recording medium in response to a user operation to select one or more contents / license files from the list displayed on the list display means
The list created by the list creation means includes information regarding the presence / absence of a music content file for each content / license file and information regarding the presence / absence of a license file. Memory player. Furthermore,
A file recording means for receiving the music content file in response to the download of the music content file from the external device and recording it on a recording medium;
A data amount recognizing means for receiving information on the data amount of the music content file from an external device upon downloading the music content file, and recognizing the data amount of the music content file based on the information;
Data amount comparison means for comparing the recognized data amount with the free space of the recording medium;
Recording command means for instructing the file recording means to receive and record a music content file downloaded from an external device when it is determined that the recognized amount of data is less than the free capacity of the recording medium;
Search command means for instructing the file search means to execute search when it is determined that the recognized data amount is larger than the free space of the recording medium;
3. The digital memory player according to claim 1 , further comprising a comparison command unit that commands a comparison operation by the data amount comparison unit after one or a plurality of content / license files are erased by the file deletion unit.

Images