JP3893980B2 - Electronic musical instrument and performance data acquisition program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention uses a network to perform dataoftransferTheElectronic musical instruments that can perform automatic performances based on performance data, andAndThe present invention relates to a performance data acquisition program.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in the fields of electronic musical instruments and computer music, there are services that distribute performance data used for automatic performance and the like over a network. For example, performance data can be received from a server for a fee using the Internet on a personal computer or the like, and the performance data can be taken into an electronic musical instrument connected to the personal computer. The electronic musical instrument performs various performances or various processes based on the captured performance data. In addition, before purchasing performance data, it is also possible to audition with trial performance data in advance.
[0003]
[Problems to be solved by the invention]
By the way, a personal computer and an electronic musical instrument are often connected with a cable of the MIDI standard that is widely used. Also, the performance data of the MIDI standard is widely used. For this reason, it is necessary to send data from the personal computer to the electronic musical instrument as MIDI standard data from the MIDI terminal, and the performance data is also MIDI standard. I send it to a musical instrument.
[0004]
Therefore, the performance data output from the personal computer can be freely extracted as data that can be used for automatic performance or the like as it is. For this reason, there is a possibility that the performance data for trial listening or the performance data for purchase may be illegally used, and there is a problem from the viewpoint of protecting the copyright of the performance data.
[0005]
It is an object of the present invention to prevent performance data distributed from a server from being illegally handled.
[0006]
[Means for Solving the Problems]
  The electronic musical instrument according to claim 1 is a communication unit that transmits / receives various data to / from an external device, and an instruction from the external device by the communication unit.When there wasKey generation means for generating a new key and transmitting the generated key to the external device; and performance data encrypted by the external device performing bit shift or bit replacement using the generated key. The communication means receives the performance data from the external device and decrypts the performance data by performing bit shift or bit replacement using the generated key, and reproduces the performance data decrypted by the decryption means. And reproducing means.
[0007]
  According to the electronic musical instrument of claim 1 configured as described above, an instruction is given from an external device.When there wasA new key is generated and the generated key is sent to the external device. The external musical instrument uses the key to perform bit shift or bit exchange to obtain encrypted performance data, and the electronic musical instrument receives the performance data from the external device through communication means. Since the performance data is decrypted by performing bit shift or bit replacement using the generated key, even if data sent to the electronic musical instrument from an external device (for example, a personal computer) flows out to the outside, the performance data is played as it is. Cannot be used as data. Therefore, the performance data can be safely sent from the personal computer to the electronic musical instrument, and the performance data can be prevented from being illegally handled. In addition, electronic musical instruments can be instructed from external devices.When there wasSince a new key (different key) is generated, even if the key for decryption leaks, even if one data transfer is damaged, it can be transferred safely with other data transfer. Can be minimized.
[0008]
  The performance data acquisition program according to claim 2 is instructed from an external device by communication means.When there wasA process of generating a new key and sending the generated key to the external device; and the performance data encrypted by the external device performing bit shift or bit replacement using the generated key, A process of receiving the performance data from the external device and decoding the performance data by performing bit shift or bit replacement using the generated key, and a process of reproducing the decrypted performance data According to the performance data acquisition program, the same effect as that of the first aspect can be obtained.
[0012]
  The electronic musical instrument according to claim 3 is a MIDI communication means for transmitting / receiving MIDI standard data to / from an external device via a MIDI cable, and bit-shifting or bit-changing MIDI performance data in the external device. And receiving the MIDI standard exclusive data embedded with the encrypted data from the external device by the MIDI communication means, and bit-shifting or bit-shifting the data embedded in the exclusive data. Decoding means for decoding the performance data in the MIDI format by exchanging; and reproducing means for reproducing the performance data decoded by the decoding means;It is provided with.
[0013]
  Claims configured as above3ofElectronic musical instrumentsAccording toFrom external equipmentThe performance data after encryption is embedded in exclusive data that can handle arbitrary data.ConcernedElectronic musicIn a vesselBecause I sendExternal deviceElectronic music (eg personal computer)In a vesselPerformance data can be sent safely,By means of MIDI communication means for transmitting / receiving MIDI standard data to / from external devices via a MIDI cable,Since the encrypted data can be converted to MIDI standard data that can be easily transmitted from the MIDI terminal, the system can be easily configured using the MIDI standard while protecting performance data.
[0014]
  5. The performance data acquisition program according to claim 4, wherein the MIDI format performance data is encrypted by performing bit shift or bit replacement in an external device, and the MIDI standard exclusive data in which the encrypted data is embedded. Is received from the external device by MIDI communication means, and the data embedded in the exclusive data is decoded into performance data in MIDI format by performing bit shift or bit replacement, and the decoded performance data Is executed by a computer, and the performance and effect similar to the third aspect can be obtained by executing this performance data acquisition program.
[0022]
  Note that the key used for new encryption is generated as a random value, such as a random value.TheHowever, this different content includes a case where the content is different at least for a certain period and a certain number of times.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an entire system according to an embodiment of the present invention, and this embodiment is directed to an electronic organ (for example, “Electone (registered trademark)”) as an electronic musical instrument. In the figure, the personal computer is abbreviated as “PC” and the electronic organ is abbreviated as “EL”. The electronic organ 1 is connected to a personal computer 2 as a performance data transfer control device with a MIDI cable. The personal computer 2 is connected to a server 4 (the computer) via a communication network 3 such as the Internet.
[0024]
<Performance data>
The computer of the server 4 has a database, and stores “purchase performance data” and “trial listening performance data” corresponding to each song for a large number of songs. The performance data for purchase and the performance data for trial listening (hereinafter collectively referred to as “performance data”) include “reproduction mode data” and “music data”.
[0025]
The reproduction mode data is data referred to as “registration” or “registration”. As shown in FIG. 2A, for example, data specifying the tone of the first keyboard (lower keyboard) of the electronic organ 1; Data that determines various settings such as the tone and effects of the electronic organ 1, such as data that specifies the effect on the first keyboard, data that specifies the tone of the second keyboard (upper keyboard), and data that specifies the effect on the second keyboard It is. This reproduction mode data is assigned to a registration switch provided on the operation panel when used in the electronic organ 1, and by operating the registration switch, the electronic organ 1 corresponds to the assigned reproduction mode data. It is set to the aspect.
[0026]
Also, for each song, a plurality of reproduction mode data corresponding to the music flow is often used as a set, and in this case, each reproduction mode data is assigned to a plurality of registration switches. Therefore, for example, by operating the registration switch during a keyboard performance (manual performance), it is possible to switch modes such as timbres and effects in the middle of the music according to the music flow. Further, in the automatic performance, the reproduction mode data can be switched in accordance with the instruction data recorded in the performance data, and the tone color and the effect can be automatically switched in accordance with the flow of the automatic performance.
[0027]
The music data is data called “song”, for example, and as shown in FIG. 2 (B), musical sound event data (MIDI event data) corresponding to one musical sound is stored according to the performance timing. is doing. In addition, as described above, data indicating playback mode data set at the time of music playback is also included.
[0028]
Note that there are songs in which both the performance data for purchase and the performance data for trial listening have both reproduction mode data and music data, and there are songs that have only one of them. For example, there is a song that the music data has only in the performance data for trial listening. In this case, only the reproduction mode data (registration) is purchased by the performance data for purchase, and the actual performance of the song is a keyboard performance, etc. Is what you do. In addition, there is a song that has only the playback mode data as performance data for trial listening. In this case, the playback mode is auditioned by setting the playback mode data and playing the keyboard. Furthermore, the playback mode data of the trial performance data may be the same as the playback mode data of the purchase performance data, or may be partially omitted from the playback mode data of the purchase performance data.
[0029]
<Hardware configuration>
The electronic organ 1 and the personal computer 2 are each provided with a basic configuration of a microcomputer including a CPU, an input / output device, a storage device, and the like. For the sake of simplicity, the main parts of both hardware configurations are shown in FIG. Shown in common block diagram. The CPU 10a executes a control program stored in the ROM 10b, the RAM 10c, or the external storage device 10d, and realizes the functions of the electronic organ 1 and the personal computer 2. The timer 10e takes control timing and generates a reproduction clock for automatic performance. A MIDI interface (I / F) 10f exchanges MIDI signals with an external MIDI device 10g. When this block diagram is the electronic organ 1, the MIDI device 10g corresponds to the personal computer 2, and when this block diagram is the personal computer 2, the MIDI device 10g corresponds to the electronic organ 1.
[0030]
In the case of the electronic organ 1, specific examples of each element are as follows. In this embodiment, the external storage device 10d is an FDD (floppy (trademark) disk drive), and purchase performance data purchased upon distribution is stored on a floppy disk as a storage unit. The operation element 10h is a keyboard (lower keyboard, upper keyboard, pedal keyboard), a foot switch, an operation panel switch, or the like, and various operations are detected by the detection circuit 10i. The display unit 10j is a liquid crystal display or the like provided on the operation panel, and is driven through the display circuit 10k.
[0031]
The tone generator circuit 10m generates musical sound signals corresponding to various keyboard operations of the electronic organ 1 according to the set tone color, and outputs them to a sound system 10n such as an amplifier or a speaker to generate musical sounds. When an automatic performance is performed based on the music data, an interrupt process is performed by the timer 10e, the data of various notes in the music data is reproduced, and the note code, touch data, note on / note off, etc. are transmitted to the tone generator circuit 10m. To generate music. The ROM 10b stores a control program (performance data acquisition program on the electronic musical instrument side). Note that the electronic organ 1 alone can be connected to the communication network 3 via the communication interface 10p.
[0032]
In the case of the personal computer 2, specific examples of each element are as follows. The external storage device 10d is an HDD (Hard Disk Drive), FDD, CD-ROM (Compact Disk-Read Only Memory) device, magneto-optical disk (MO) device, digital multipurpose disk (DVD) device, etc., and a control program ( A performance data transfer control program) is downloaded from the server 4 to the external storage device 10d. The operation element 10h is a keyboard, a mouse, or the like, and various operations are detected by the detection circuit 10i. The display unit 10j is a liquid crystal display, a CRT display, or the like, and is driven via the display circuit 10k to display an initial screen and a trial listening screen described later when performance data is purchased. Further, data is exchanged with the server 4 via the communication interface 10p and the communication network 3, and a performance data distribution service used in the electronic organ 1 (MIDI device 10g) is received.
[0033]
<Outline of operation and processing>
FIG. 5 is a diagram conceptually showing the general operation and the flow of data and instructions in the embodiment, and the outline of the operation and processing in the embodiment will be described. The server 4 is a site that provides performance data. When the server 4 is accessed using the browser of the personal computer 2, the server 4 is started up and the site is presented to the personal computer 2, and the performance data is transmitted from the server 4. A transfer control program is downloaded. Simultaneously, HTML file data for screen display is distributed. As a result, the initial screen shown in FIG. Then, while accessing the server 4, the listening operation, purchase operation, and confirmation operation can be executed by operating the controls (screen switches) SW 1, SW 2, SW 3 of this initial screen with a mouse or the like.
[0034]
Therefore, when a desired song is selected on the initial screen and a request for audition is transmitted to the server 4, the HTML file data is sent from the server 4, and the audition screen shown in FIG. 4B is displayed on the personal computer 2. Also, the performance data for trial listening encrypted from the server 4 (first encryption) is sent to the personal computer 2. The personal computer 2 decodes this (first decoding), sends an instruction to the electronic organ 1 to fix the electronic organ 1 as the audition mode, and sends performance data for audition to be sent later to the electronic organ 1. Set to prevent external output.
[0035]
The electronic organ 1 generates a key for re-encryption, and the personal computer 2 newly encrypts performance data for trial listening (second encryption) based on the key. Then, the encrypted data is included in the MIDI standard exclusive data and sent to the electronic organ 1, and the electronic organ 1 extracts the encrypted data from the received exclusive data and decrypts it based on the key (the first data). 2 decoding) to obtain performance data for trial listening. The first encryption method and the second encryption method are different. Each method includes two different data: a data communication standard between the server 4 and the personal computer 2 (data format of data to be transmitted) and a data communication standard between the personal computer 2 and the electronic organ 1. It is suitable for each communication standard. The performance data encrypted by the first encryption is in a data format that can be communicated between the server 4 and the personal computer 2, and the performance data encrypted by the second encryption is the personal computer 2 and the electronic organ 1. It is a data format that can communicate with each other.
[0036]
As described above, the electronic organ 1 can perform an automatic performance or a keyboard performance (that is, a playback mode audition) based on the audition performance data. When the trial listening is finished, when the operation switch SW4 on the trial listening screen of the personal computer 2 is operated, the personal computer 2 sends an instruction to cancel the mode to the electronic organ 1. Thereby, the electronic organ 1 erases the stored performance data for trial listening and cancels the trial listening mode by allowing other data to be output externally.
[0037]
When purchasing the performance data after the above trial listening, the server 4 selects the music (for example, the music that was auditioned) on the initial screen and transmits the purchase request to the server 4. Is encrypted (first encryption) and transmitted to the personal computer 2, and the personal computer 2 decrypts it (first decryption). Then, the personal computer 2 confirms with the electronic organ 1 whether the floppy disk is ready. Corresponding to this, the electronic organ 1 sends a result (status information) to the personal computer 2 after formatting the floppy disk and securing a free space if necessary. When free space is secured on the formatted floppy disk, the personal computer 2 moves to an operation of transmitting purchase performance data.
[0038]
The operation for transmitting the performance data for purchase is the same as that for the performance data for auditioning, instructing the electronic organ 1 to fix the mode, generating a key in the electronic organ 1, and re-encrypting the data in the personal computer 2 (first encryption). 2 encryption) and MIDI processing, and decryption processing in the electronic organ 1. Then, the performance data for purchase decrypted in the electronic organ 1 is written to the storage unit (floppy disk) and protected, and thereafter, the mode fixed state of the electronic organ 1 is released as in the case of the performance data for trial listening. .
[0039]
<Second encryption>
FIG. 6 is a diagram showing the concept of second encryption performed by the personal computer 2. As shown in (I), the performance data for one file (one song) distributed and decoded from the server 4 is in the MIDI format or the like, and predetermined event data for reproducing the song is stored in order. Is. Each (I) circle represents each event data (timing data, MIDI event data, etc.), and each data is stored in the order of processing. The original performance data cannot be reproduced by the normal reading method (the method of reading the bit string in order from the beginning of the file) using the key to receive the data string of one file from the electronic organ 1 in (I). Converting to a data string (re-encrypting) and processing the converted data string into a data format that can be sent to the electronic organ 1 (converting to MIDI) is called second encryption.
[0040]
As the conversion method, the data sequence (bit sequence) of (I) is converted to a new data sequence by shifting the data sequence (bit sequence) forward or backward by the amount represented by the key received from the electronic organ 1 (in the beginning). (The data is shifted to the end, and the last data is shifted to the beginning.) Of the data sequence (I), the data sequence (bit sequence) of the portion represented by the key received from the electronic organ 1 is in the order of replacement represented by the key. There is a method of converting to a new data string by replacing. As shown in (II), the data string (I) whose contents have been destroyed by these conversion methods is a series of broken data that cannot be reproduced by the normal reading method.
[0041]
Then, as shown in (III), the data string of (II) is extracted in order of a predetermined length (for a predetermined number of bits) from the top, and the extracted data and a number indicating the order of extraction are set as message contents. And is sent to the electronic organ 1 after being processed into the exclusive data (representing the system exclusive message data of the MIDI standard). This creation and transmission process is repeated until all data is extracted from the data string (II). In the electronic organ 1, the data received from the personal computer 2 is restored to the original performance data by the reverse procedure (second decoding).
[0042]
The second encrypted data is encrypted as being suitable for a transmission path independent of the transmission path by the communication network 3 between the personal computer 2 and the server 4. That is, each encrypted data is embedded in the MIDI standard exclusive data, and is data suitable for a transmission path by the MIDI cable between the electronic organ 1 and the personal computer 2.
[0043]
<Audition operation>
FIG. 7 is a diagram illustrating a processing procedure of the server 4, the personal computer 2, and the electronic organ 1 when performing the trial listening operation in the embodiment. Note that the following auditioning operation, purchase operation described later, and processing shown in the flowcharts described later correspond to a “performance data transfer control program” in the personal computer 2 and a “performance data acquisition program” in the electronic organ 1.
[0044]
Before the processing of FIG. 7, the personal computer 2 is connected to the server 4 via the communication network 3. The performance data transfer control program is downloaded from the server 4 to the personal computer 2, and an initial screen (FIG. 4A) is displayed.
[0045]
First, since the music list N (FIG. 4A) is displayed on the initial screen, the desired music is selected and the test listening switch SW2 is operated, and the personal computer 2 requests the server 4 for the test listening. (Step A1 in FIG. 7). As a result, the server 4 reads out the performance data for trial listening of the requested music from the database, encrypts the performance data for trial listening in MIDI format under a predetermined condition (first encryption), and sends it to the personal computer 2. Send (step A2). Note that the first encryption is the same as in the prior art, and the data after encryption is in a format that can be transmitted over the line of the communication network 3. The server 4 also transmits an HTML file for displaying a preview screen.
[0046]
Next, the personal computer 2 displays a trial listening screen (FIG. 4B) based on the HTML file (step A3), and the data transmitted from the server 4 is decoded into MIDI performance data for trial listening (first step). 1 decoding) (step A4). Then, an instruction for fixing the mode is sent to the electronic organ 1 (step A5).
[0047]
In response to the instruction from the personal computer 2, the electronic organ 1 performs a mode fixing process, which will be described later, shown in FIG. 8, and sets so that the performance data for trial listening received thereafter cannot be output to the outside (step A6). . Next, a key generation process shown in FIG. 9 is performed to newly generate a key for encrypting trial performance data supplied from the personal computer 2 (second encryption), and the key is stored in the personal computer 2. (Step A7).
[0048]
When the personal computer 2 receives the key, it performs the re-encryption process shown in FIG. 10 and encrypts the performance data for one file (one song) as described above according to the key (second encryption). (Step A8). Then, the MIDI processing shown in FIG. 11 is performed, and the encrypted data is inserted into the exclusive data and sent to the electronic organ 1 (step A9).
[0049]
Next, the electronic organ 1 performs the decryption process shown in FIG. 12, receives all the exclusive data for one file from the personal computer 2, and decrypts it into performance data for trial listening (second decryption) ( Step A10). Then, the process of the trial listening mode shown in FIG. 13 is performed to reproduce the decoded performance data for trial listening (step A11). That is, operations other than output to the outside of the electronic organ 1 are processed as usual.
[0050]
On the other hand, the personal computer 2 detects the operation of the operation switch SW4 at the end of the trial listening screen (FIG. 4B), monitors whether there is an instruction to end the trial listening (step A12), and instructs to end the trial listening. If there is, an instruction to cancel the mode is sent to the electronic organ 1 (step A13). Then, the electronic organ 1 performs the mode release processing shown in FIG. 14 to erase the performance data for trial listening in the memory so that data written to the memory thereafter can be output to the outside (step A14). .
[0051]
Next, specific processing of steps A6 to A11 and A14 will be described based on the flowcharts of FIGS. When the electronic organ 1 receives an instruction for fixing the mode from the personal computer 2 (step A6), the electronic organ 1 starts the mode fixing process of FIG. 8 in response thereto. First, in step S11, data in the temporary storage unit preset in the RAM 10c or the like is erased, external transmission of the data in the temporary storage unit is prohibited in step S12, and data in the temporary storage unit is moved in step S13. Ban. Next, in step S14, the display on the display unit (10j in FIG. 3) is set to the trial listening mode screen so that it cannot be changed to another screen, and in step S15, writing of data in the temporary storage unit is prohibited. The write prohibition of the temporary storage unit is a prohibition of writing by an external operation for editing the performance data for trial listening in the temporary storage unit using the operation element 10h of the electronic organ 1 or the like. In the internal processing of the electronic organ 1 such as writing of performance data for trial listening sent from the personal computer 2, writing is performed as necessary.
[0052]
The state after each setting of the above steps S11 to S15 is the “trial listening mode”, and in this trial listening mode, the received performance data for trial listening cannot be output to the outside. Note that the preview mode screen of the display unit is the same as that shown in FIG. 4B, for example, and it is possible to confirm that the electronic organ 1 is also fixed to the audition mode. In this audition mode, it is preferable that the contents of the performance data for audition cannot be changed or edited.
[0053]
The electronic organ 1 starts the key generation process of FIG. 9 when the mode fixing process is completed, that is, when the mode fixing is completed. First, in step S21, a random number having a specific length is generated. In step S22, it is determined whether or not the generated number is a previously generated number. If it is a previously generated number, the process proceeds to step S21. Returning to step S23, if the number is not previously generated, the generated number is sent to the personal computer 2 as a key for re-encryption. In step S24, the generated key is held for decryption. In addition, what is stored as a previously generated number (key) may be sequentially excluded from the determination criteria when the history is somewhat out of date.
[0054]
When the personal computer 2 receives the key from the electronic organ 1, in response to this, the personal computer 2 performs the re-encryption (second encryption) processing of FIG. 10 corresponding to (I) to (II) of FIG. In step S31, in accordance with the contents of the key, the contents of the performance data for trial listening in the MIDI format that has been decrypted (first decryption) are broken and encrypted (second encryption). Next, the personal computer 2 performs the MIDI conversion processing of FIG. 11 corresponding to (II) to (III) of FIG. 6, and in step S41, a part of the data re-encrypted in step S31 of FIG. In step S42, a part of the data is embedded in the exclusive data. Then, in step S43, the exclusive data is sent to the electronic organ 1, and in step S44, it is determined whether all the re-encrypted data has been sent. If not all the data has been sent, step S41 and subsequent steps are repeated. In step S45, the electronic organ 1 is informed that all data has been sent.
[0055]
When the transmission of data from the personal computer 2 is started, the electronic organ 1 starts the decoding (second decoding) process of FIG. 12, stores the data received in step S51 in the temporary storage unit, and performs step S52. To determine whether the data transmission is completed. If not completed, the process returns to step S51, and if completed, the process proceeds to step S53. That is, after receiving from the personal computer 2 that transmission has been completed, the next decoding is performed. In step S53, the received data is rearranged in the normal order based on the number representing the data order, and in step S54, the embedded data is extracted from all the exclusive data and connected. Then, decryption (second decryption) is performed using the key held in step S55.
[0056]
When the above decoding is completed, the electronic organ 1 starts the process of the trial listening mode in FIG. 13, and reproduces the performance data for trial listening in the temporary storage unit in step S61. In this playback process, playback mode data (registration data) in the performance data for trial listening is assigned to the registration switch, and if music data is included in the performance data for trial listening, automatic performance is performed based on the music data. To do. Next, an operation on the operation panel (of the electronic organ 1) is detected in step S62, and in step S63, it is determined whether or not the instructed operation is an operation that is prohibited in this audition mode. The prohibited operation is an operation to copy or edit the performance data for audition in the temporary storage unit.For example, the operation to cancel the audition mode or the performance data for audition to the external device This is an operation to transmit (output), an operation to move the performance data for trial listening to another storage unit in the electronic organ 1, an operation to make a copy of the performance data for trial listening, or an operation to edit the content of the performance data for trial listening. On the other hand, operations that are not prohibited are operations for performing audition using performance data for audition such as playing a keyboard or changing the playback mode. An operation of a registration switch for changing the reproduction mode and an operation of turning off the power of the electronic organ 1 are performed.
[0057]
If it is prohibited, the operation is ignored and the process returns to step S62. If not prohibited, the operation corresponding to the operation instructed in step S64 is performed, and the process proceeds to step S65. In step S65, it is determined whether or not the power is turned off. If it is not turned off, the process returns to step S62. If it is turned off, data in the temporary storage unit (trial listening performance data) is erased in step S66 and the audition mode is set. The process ends.
[0058]
Next, when there is an instruction to end the trial listening on the personal computer 2 (step A12 in FIG. 7), an instruction to cancel the mode is sent from the personal computer 2 to the electronic organ 1, so that the electronic organ 1 cancels the mode cancellation in FIG. Start processing. First, the data in the temporary storage unit is erased in step S71, external transmission of the data in the temporary storage unit is enabled in step S72, and the movement of the data in the temporary storage unit is enabled in step S73. Next, a normal mode screen is displayed on the display unit in step S74, and writing of data in the temporary storage unit is enabled in step S75, and the process ends. As a result, the trial listening is completed and the performance data for trial listening is erased, and the electronic organ 1 returns to the normal state.
[0059]
Through the above processing, in the audition mode, the playback mode data assigned to the registration switch is read, and the keyboard performance is performed with the playback mode of the electronic organ 1 changed, or the trial mode stored in the temporary storage unit is used. Music data can be played automatically. In addition, the external transfer operation and the content change operation of the data in the temporary storage unit are invalidated, and illegal copying of the trial performance data can be prevented.
[0060]
<Purchase action>
FIG. 15 is a diagram illustrating processing of the server 4, the personal computer 2, and the electronic organ 1 when performing a purchase operation in the embodiment. When the end of the trial listening is instructed in the process of step A12 (FIG. 7) of the personal computer 2, the personal computer 2 returns to the initial screen of FIG. 4 (A). Therefore, a desired song (for example, a song that was auditioned) is selected on the initial screen, and the purchase operator SW1 is operated to request purchase (step B1). As a result, the server 4 performs a billing process (step B2), encrypts the performance data for purchase (first encryption), and transmits it to the personal computer 2 (step B3). The personal computer 2 receives and decodes the transmitted data (step B4).
[0061]
When the decryption is completed, the personal computer 2 and the electronic organ 1 perform the confirmation operation shown in FIG. 16 in steps B5 and B6 to confirm whether the electronic organ 1 has a floppy disk (storage unit) ready. In the confirmation operation process of FIG. 16, in the personal computer 2, in step S81, an instruction to confirm whether a floppy disk is inserted is sent to the electronic organ 1. Thereby, the electronic organ 1 determines whether or not a floppy disk is inserted in step S82, and transmits the determination result to the personal computer 2 as state information in step S83. The personal computer 2 determines whether or not it is inserted in step S84. If it is not inserted, in step S85, a display prompting the user to insert the floppy disk into the electronic organ 1 is performed, and the process returns to step S81.
[0062]
The loop of steps S81 to S85 is repeated until the floppy disk is inserted, and the insertion is periodically confirmed. In this example, the insertion of a floppy disk is checked periodically, but when a screen prompting to insert a floppy disk is displayed and the OK switch on this screen is pressed (clicked) ), The insertion of the floppy disk may be reconfirmed.
[0063]
If a floppy disk is inserted, an instruction to confirm whether the floppy disk is unformatted is sent to the electronic organ 1 in step S86. Thereby, the electronic organ 1 determines the formatting state of the floppy disk in step S87, and formats the floppy disk if it is unformatted in step S88. In step S89, the personal computer 2 is notified of the completion of formatting as status information. Next, in step S801, the personal computer 2 sends an instruction to the electronic organ 1 to confirm whether there is a free area on the floppy disk. At this time, data of a capacity necessary for recording the performance data for purchase is also sent at the same time.
[0064]
Accordingly, the electronic organ 1 determines whether or not there is a free area on the floppy disk in step S802, and transmits the determination result to the personal computer 2 as status information in step S803. In step S804, the personal computer 2 determines whether or not there is a free area. If there is no free area, the personal computer 2 displays a message prompting to create a free area on the floppy disk in step S805 and returns to step S801. If there is free space on the floppy disk, the process proceeds to step B7 in FIG. 15 to return to the purchase operation. The loop of steps S801 to S805 is repeated until an empty area is created, but a screen prompting to create an empty area is displayed, and only when the OK switch on this screen is pressed (clicked). The presence or absence of the area may be reconfirmed.
[0065]
The processing in steps B7 to B12 in FIG. 15 is the same as the processing for the trial performance data in steps A5 to A10 (FIGS. 8 to 12) in FIG. However, until the mode is canceled by recording the performance data for purchase on the floppy disk by these processes, the external transmission of the data in the temporary storage unit is prohibited, the data in the temporary storage unit is Prohibition of movement and prohibition of writing data in the temporary storage unit are set.
[0066]
When decryption is completed at step B12 in the electronic organ 1, the decrypted performance data for purchase is written to the floppy disk (storage unit) at step B13, and the floppy disk (storage unit) is protected at step SB14 for processing. finish. This protection is processing for prohibiting copying (duplication) of performance data for purchase from a floppy disk, and a known technique can be applied.
[0067]
On the other hand, when the personal computer 2 finishes sending all the data re-encrypted by the MIDI conversion process in step B11 to the electronic organ 1, it sends an instruction to cancel the mode to the electronic organ 1 (step B15). In response to this instruction, the organ 1 performs a mode release process (step A16). Note that the mode canceling process in step A16 is the same as that shown in FIG. 14 described above. By this mode canceling process, the performance data for purchase in the temporary storage unit is erased and the electronic organ 1 returns to the normal state.
[0068]
With the above processing, the presence / absence of a floppy disk, the format state, and the presence / absence of a free area can be automatically confirmed, and the distributed performance data can be reliably acquired. Further, when performance data is transmitted from the personal computer 2 to the electronic organ 1, it is not encrypted as performance data unless it is re-encrypted and transmitted by the personal computer 2 and re-decrypted using the key by the electronic organ 1. Data output from the computer 2 via the MIDI cable cannot be used as performance data as it is, and unauthorized use can be prevented.
[0069]
In the purchase operation of the embodiment (FIG. 15), the mode release is instructed when all the data has been sent in the MIDI conversion process (step B11) of the personal computer 2. After completion of the disk protection, the electronic organ 1 may issue a request to cancel the mode to the personal computer 2, and the personal computer 2 may instruct to cancel the mode in response to the request.
[0070]
In the embodiment, the performance data for audition is stored in the server 4, but when the request for audition is met without preparing the performance data for audition, specific information is deleted from the performance data for purchase. May be created as performance data for trial listening and distributed for trial listening.
[0071]
Also, the setting instruction for the trial listening mode may be issued from the server to the electronic organ via the personal computer instead of from the personal computer. In this way, the provider of the performance data for trial listening can reliably protect the performance data.
[0072]
Also, when the personal computer connects to the site, the electronic organ can be set to the audition mode so that the audition mode can be continued without exiting the site or turning off the electronic organ or the personal computer. .
[0073]
Further, it is preferable to confirm that the electronic organ is connected before checking the floppy disk, and to prompt the connection of the electronic organ if not connected. Then, the confirmation operation of the floppy disk may be performed after the connection of the electronic organ is confirmed.
[0074]
Further, in the embodiment, the determination result of the presence / absence of a floppy disk, the format state, and the presence / absence of a free space is sent to the personal computer one by one. Information may be sent to a personal computer at a time.
[0075]
In the embodiment, the case where a floppy disk is targeted as the storage unit has been described. However, when there are a plurality of types of storage units in the electronic organ, it is possible to select which storage unit to record the performance data for purchase. Good. The selection method may be any of a method that the user selects on the personal computer, a method that the user selects on the electronic organ, a method that the personal computer automatically selects, and a method that the electronic organ automatically selects. When the electronic organ is selected, the personal computer is informed of the selected storage unit, and the same confirmation operation and purchase operation are performed using the storage unit as a storage unit for storing performance data for purchase.
[0076]
In addition, the encryption applied when sending performance data from the server to the personal computer and the encryption applied when sending performance data from the personal computer to the electronic organ are data created as a result of encryption, Any encryption method may be used as long as the communication path can be transmitted between the server and the personal computer and between the personal computer and the electronic organ. Note that the method of the embodiment is one of the preferable methods in terms of ease of processing and reliability of protection.
[0077]
Encryption on a personal computer is not limited to encrypting all the data of one file, but is a format that can be output at a MIDI terminal, and the original performance data cannot be reproduced simply by reproducing the output data. Any form can be used. For example, only a part of performance data for one file may be encrypted using a key, embedded in exclusive data, and transmitted, and other data may be transmitted as it is.
[0078]
When the electronic organ is directly connected to the server, the operation of the personal computer may be performed by either the electronic organ or the server. In this case, re-encryption is unnecessary. The server may perform the encryption performed by the personal computer and send the performance data to the electronic organ, or the electronic organ may have an interface that can receive the data encrypted by the encryption performed by the server. The decryption performed by the personal computer may be performed on the electronic organ side. In this case, the server performs the part of the confirmation operation that was performed by the personal computer. That is, the server sends an instruction for confirming the state of the storage unit (for example, a floppy disk) to the electronic organ, and the electronic organ sends the same state information of the storage unit to the server. In addition, the server displays, for example, a prompt for the electronic organ to set the storage unit in a state where performance data can be stored.
[0079]
In the above example, a personal computer has been described as an example of the performance data transfer control device connected to the server. However, as the performance data transfer control device, the first electronic musical instrument is directly connected to the server, and the first electronic musical instrument is further connected. When another electronic musical instrument is connected to the musical instrument, the first electronic musical instrument may be operated by the personal computer 2 and the other electronic musical instrument may be operated by the electronic organ 1. Needless to say. In this case, the first electronic musical instrument may be provided with an interface capable of receiving data encrypted by the encryption performed by the server.
[0080]
In the above embodiment, the electronic organ has been described as an example, but any form of electronic musical instrument may be used. Moreover, although the case where performance data included the reproduction | regeneration aspect data (registration data) for electronic organs was demonstrated, performance data may be a form only of music data, for example. Furthermore, it goes without saying that any form of performance data may be used.
[0081]
【The invention's effect】
  Claim 1Electronic musical instrumentsOr claims2Performance dataGetAccording to the execution of the program, for example, electronic music can be transmitted from a personal computer.In a vesselEven if the data to be sent leaks outside, it cannot be used as performance data as it is.In a vesselThe performance data can be sent safely, and the performance data can be prevented from being handled illegally.
[0084]
  Claim3ofElectronic musical instrumentsOr claims4Performance dataGetAccording to the execution of the program, for example, electronic music can be transmitted from a personal computer.In a vesselPerformance data can be sent safely, and encrypted data can be easily sent from the MIDI terminal as MIDI standard data, so the system can be used to protect performance data while using the MIDI standard. Can be configured easily.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an overall system in an embodiment of the present invention.
FIG. 2 is a diagram showing an example of reproduction mode data and music data in the embodiment of the present invention.
FIG. 3 is a block diagram of an electronic organ and a personal computer according to an embodiment of the present invention.
FIG. 4 is a diagram showing an example of an initial screen and a trial listening screen in the embodiment of the present invention.
FIG. 5 is a diagram conceptually showing a schematic operation and a flow of data and instructions in the embodiment of the present invention.
FIG. 6 is a diagram showing a concept of second encryption in the embodiment of the present invention.
FIG. 7 is a diagram showing a processing procedure of a server, a personal computer, and an electronic organ when performing a trial listening operation in the embodiment of the present invention.
FIG. 8 is a flowchart of a mode fixing process in the embodiment of the present invention.
FIG. 9 is a flowchart of key generation processing according to the embodiment of the present invention.
FIG. 10 is a flowchart of re-encryption processing according to the embodiment of the present invention.
FIG. 11 is a flowchart of MIDI processing according to the embodiment of the present invention.
FIG. 12 is a flowchart of a decoding process in the embodiment of the present invention.
FIG. 13 is a flowchart of processing in a trial listening mode in the embodiment of the present invention.
FIG. 14 is a flowchart of mode release processing according to the embodiment of the present invention.
FIG. 15 is a diagram showing processing of a server, a personal computer, and an electronic organ when performing a purchase operation in the embodiment of the present invention.
FIG. 16 is a diagram showing processing of a confirmation operation in the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electronic organ (electronic musical instrument), 2 ... Personal computer (performance data transfer control apparatus), 3 ... Communication network, 4 ... Server.

Claims (4)

A communication means for transmitting / receiving various data to / from an external device;
When there is an instruction from the external device in the communication unit, a key generation unit that generates a new key and sends the generated key to the external device;
The performance data encrypted by the external device by performing bit shift or bit replacement using the generated key is received from the external device by the communication means, and the performance data is received using the generated key. Decoding means for decoding by performing bit shift or bit substitution;
Reproducing means for reproducing the performance data decoded by the decoding means;
An electronic musical instrument characterized by comprising: When there is an instruction from the external device in the communication means, processing to generate a new key and send the generated key to the external device;
The performance data encrypted by the external device by performing bit shift or bit replacement using the generated key is received from the external device by the communication means, and the performance data is received using the generated key. Decoding by performing bit shift or bit substitution,
Processing to reproduce the decoded performance data;
Performance data acquisition program for running on a computer. MIDI communication means for transmitting / receiving MIDI standard data to / from an external device via a MIDI cable;
In the external device, the performance data in the MIDI format is encrypted by performing bit shift or bit replacement, and the MIDI standard exclusive data in which the encrypted data is embedded is transmitted by the MIDI communication means. Decoding means that receives data from an external device and decodes the data embedded in the exclusive data into performance data in MIDI format by performing bit shift or bit substitution;
Reproducing means for reproducing the performance data decoded by the decoding means;
An electronic musical instrument characterized by comprising: In the external device, the MIDI format performance data is encrypted by performing bit shift or bit replacement, and the MIDI standard exclusive data in which the encrypted data is embedded is transmitted by the MIDI communication means to the external device. Receiving the data embedded in the exclusive data into the performance data in the MIDI format by performing bit shift or bit substitution,
Processing to reproduce the decoded performance data;
Performance data acquisition program for running on a computer.

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