JP2001282236A - Electronic information processing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embed ancillary information (second information), such as electronic signatures, by electronic watermarks into main information (first information) composed of a plurality of event data, such as MIDI data. SOLUTION: The event data in the first information composed of a plurality of the event data is classified to >=2 groups (for example, groups by channels). The second information indicating the method for changing the information is inputted and the contents of the event data included in one of these groups are changed in accordance with the second information and, on the other hand, the contents of the event data included in another group different from the one group are changed in accordance with the second information by using a changing method different from this changing method. The second information is thus dispersed and arranged in the first information. The information may be changed in accordance with the second information and third information respectively indicating the different changing methods by each of the respective groups. The second information (further, the third information) is extracted from the first information and is decoded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic storage medium for encrypting and storing main information such as tone control information (MIDI data and the like) and auxiliary information, and for encrypting information stored in a storage medium. The present invention relates to an electronic information processing method and apparatus for performing processing for detecting original main information and auxiliary information based on processed main information and auxiliary information, and further relates to a system or a recording medium thereof.

[0002]

2. Description of the Related Art Recently, it has become easy for a user to create music data, video data, waveform data, and the like using a personal computer and make various changes thereto. . Therefore, by using a personal computer, commercially available F
Music data, video data, waveform data, and the like recorded on storage media such as D, CD-ROM, and LD can be freely read and various changes can be made thereto. Since the data recorded on commercially available CD-ROMs and LDs is copyrighted by the seller, the creator, etc., it is originally not permitted to freely modify them from the viewpoint of copyright infringement. Absent. Therefore, at present C
Copyright display data for indicating to whom the literary work of the main data belongs, such as music data, video data or waveform data recorded on a medium such as a D-ROM or LD, and the music data and video data. Or, by recording additional information as additional information in a header section separate from the main data recording section that records main data such as waveform data, the copyright owner is clearly specified, and copyright infringement is prevented beforehand. It is the current situation. In addition to the copyright indication data, information indicating the title of the music data, video data and waveform data, or the data compression technology of the video data and waveform data, etc. There is information indicating a recording format such as whether the data is compressed in the.

[0003]

However, at present, data can be freely rewritten or changed using a personal computer or the like, so that copyright display data and various attached information are intentionally or neglected. There is a problem of being deleted or rewritten. In particular, when such ancillary information is recorded in the header section, there is a problem that deletion or tampering is easily performed. In addition, recently, with the development of network communication, such a problem that music data, video data, waveform data, or the like in which the copyright display data has been deleted or falsified is likely to be widely distributed through a communication network. The present invention adds ancillary information (second information) without changing the data format of main information (first information) composed of a plurality of event data such as music data and the like, and adds these data to these data. It is an object of the present invention to provide an electronic information processing method and apparatus, as well as a system or a recording medium, in which an encryption process is performed so that the main information and the attached information cannot be reproduced and used unless the encryption is decrypted. Aim.

[0004]

According to a first aspect of the present invention, there is provided a method comprising: inputting first information composed of a plurality of event data; and classifying the event data into two or more groups. Inputting second information indicating a method of changing information, and changing the content of event data included in one of the groups based on the second information, and changing the content of the event data differently from the changing method. Distributing and distributing the second information to the first information by changing the content of event data included in another group different from the one group based on the second information using a method And the step of doing. A method according to a second aspect of the present invention includes a step of inputting first information composed of a plurality of event data, a step of classifying the event data into two or more groups, and information representing a method of changing information. Inputting second information and third information, each of which represents a different change method, and converting the contents of the event data included in at least one group among the classified event data into the second information. By changing the content of event data included in another group different from the one group based on the third information, while changing based on the information, the second information is added to the first information. And distributing the third information. According to another aspect, an electronic information processing method according to the present invention includes, in any one of the methods according to the first or second aspect, inputting first information in which second information is distributed and arranged, This first
, And detects the second information distributed and arranged from the above information. From the first information in which the second information is dispersedly arranged according to the first viewpoint, second information indicating an information change method is detected from event data included in one of the groups, and the detection is performed. By detecting the second information from event data included in another group different from the group by another detection method different from the above method, the second information is dispersedly arranged for each group. The second information is detected from the first information by a different detection method for each group. Also, according to the second viewpoint, the second
Is detected from event data included in one of the groups, the second information indicating the information change method is detected from the first information, and the group information of the group is determined based on the second information. A third method for changing event data and representing an information change method different from the second information from event data included in another group different from the group.
And changing the event data of the other group based on the third information, so that the second information and the third information representing different information change methods are distributed to different groups. The second information and the third information are detected from the arranged first information, and the event data of each group is decoded according to the respective information. According to another aspect, a machine-readable storage medium according to the present invention stores a program for causing a computer to execute any of the methods according to the above aspects. According to yet another aspect, an electronic information processing apparatus according to the present invention is an electronic information processing apparatus configured to perform any one of the methods according to the above aspects.

Next, an outline will be given in relation to the embodiment described below. The first information, ie, main information, is, for example,
It may be MIDI music performance information, has a large amount of information as a whole, and is stored in a predetermined main data storage area in a memory. The second information, that is, the attached information, may be, for example, information related to the copyright indication of the music performance information, that is, the first information, stored in the main data storage area, and the music performance information, that is, the first information. It consists of a small amount of information compared to. For example,
According to the embodiment, the first information, ie, the main information, is stored in a predetermined main data storage area, and the second information, ie, the auxiliary information, is stored in the main data storage area, not in the header area.
Can be stored in the data constituting the information.

According to an embodiment, at least two data units are selected from the first information, and a data-related value having a value associated with each value of the at least two data units is obtained. This data-related value is, for example, a difference value of each value of the preceding and succeeding data units. A data segment to be incorporated into one data unit of the first information is selected from a data group constituting the second information. The size of a data segment that can be incorporated in one data unit may be a plurality of bits, or may be only one bit as needed. Based on a predetermined function using the data-related value and the value of the data segment as variables, data to be replaced with the contents of one data unit in the first information is generated. In the data unit corresponding to a predetermined one of the at least two data units. By completely replacing the contents of the corresponding data unit with the generated data, the size of the data segment of the second information that can be incorporated into one data unit can be made relatively large, and the second information It can be efficiently incorporated into the first information. In addition, since the content of the data unit is replaced, the data format of the first information is maintained as it is, and the first information as the main information is maintained.
As the second information, any type and content of data can be incorporated into the first information without requiring a change in the data format of the information. That is, arbitrary second information can be incorporated into the first information by an electronic watermarking technique.

[0007] The predetermined function used for generating data to be replaced may be realized by executing a predetermined operation using the data-related value and the value of the data segment as variables. Alternatively, the predetermined function may be realized by referring to a predetermined table using the data-related value and the value of the data segment as variables. In the arrangement of the data units in the first information, it is detected that the difference between the values of the successive data units is smaller than a predetermined value.
One data unit may be selected as the data unit to be replaced. This means that a data unit to be replaced is selected from a place where the value of the data unit in the first information has little change. This makes it possible to minimize the effects of problems such as data replacement that may occur during playback and that playback data may be disturbed.

[0008] In order to reproduce each information from the data group in which the second information is incorporated in the first information as described above, from the replaced data unit of the first information, The method may further include a step of reproducing the data-related value and the value of the data segment, and a step of reproducing the original content of the replaced data unit based on the reproduced data-related value. The data-related value is a value related to the original contents of the replaced data unit and the contents of another data unit, and the original contents of the replaced data unit are unknown, Since the content of the unit is known, the original content of the replaced data unit that is unknown can be reproduced from the reproduced data-related value and the content of another known data unit. For example, when the data-related value is composed of the difference value as described above, the original data of the replaced data unit is added or subtracted by adding or subtracting the data-related value to the content of another known data unit. Content can be reproduced. The data-related values of the two data units in the first information are not limited to calculations, but may be values obtained according to a predetermined function or table.

To facilitate the reproduction process, an appropriate flag value may be incorporated in the data unit to indicate whether or not the data unit in the first information has been replaced. As a practical matter, the incorporation of such a flag value may cause the reproduced data to be disturbed at the time of reproduction. Values may be disturbed. In the present invention, such a slight disturbance during reproduction is allowed. In other words, the original contents of the unknown replaced data unit may be seen with some disturbance in the value of the lower bits without completely and accurately reproducing it.
Even if it is only possible to reproduce an approximate value, this corresponds to "reproducing the original contents of the replaced data unit". For example, since the velocity data in the MIDI data defines the volume of a musical tone, a slight disturbance in the value of the lower bits does not cause a serious problem of impairing the reproduction performance. Therefore, it is preferable to perform a data replacement process for incorporating the second information on such data that does not cause a serious problem of impairing the reproduction performance.

[0010] As an example, the main information is edited to embed various auxiliary information in the main information and to perform the encryption processing on the main information. Main information is M
It is composed of a plurality of event data such as key-on event data of IDI data, program change data or control change data. As the additional information, character data relating to the author name, song title, image / video title, etc., data relating to a data format such as a compression method of waveform data, and various other data (ciphertext,
Key information, ID, password, news text).
This electronic information processing system uses a key-on event data group in the case of MIDI data as a predetermined data group in a data group constituting main information, and uses velocity data as unit data in the key-on event data group. And a key code data, a difference value between these successive ones is obtained and used.

Since the velocity data and the key code data take values of 0 to 127 in the MIDI message, they are 0 to 63 corresponding to a negative difference value and 64 to 127 corresponding to a positive difference value. Divided. When 4-bit data is considered as the additional information, 3 bits are assigned to key code data, and 1 bit is assigned to velocity data.
.., 56 to 63 are divided into eight regions corresponding to negative difference values, and 64 to 71, 72 to 79,.
, Divided into eight areas corresponding to positive difference values such as 120 to 127, and the velocity data is 0 to 31, 32
It is divided into two regions corresponding to negative difference values such as ~ 63 and 63-95, and 96 ~ 127. When these key code and velocity values are associated with the respective axes of the XY coordinates, when the key code and velocity difference values are both positive, the key code difference value is positive and the velocity difference value is negative. , When the difference between the key code and the velocity is negative, the four cases where the difference between the key code is negative and the difference between the velocities are positive respectively correspond to the four quadrants of the XY coordinate system. .

Accordingly, each quadrant is determined according to the sign of the difference between the key code and the velocity, the range of the key code and the value of the velocity is determined according to the value of the attached information, and the range is determined according to the difference. Is determined, the determined value is used as a new key code and velocity value, so that the value can be converted to a value different from the previous key code and velocity. Since the converted key code and velocity values have no correlation with the original values, even if they are reproduced by automatic performance, they will be scrambled (encrypted) and will not be established as performance sounds. In addition, since multiple bits of data can be embedded in one key-on event data as accessory information, a large amount of data can be transmitted together with the main information without deteriorating the quality of the main information.

The data group constituting the main information edited as described above may be recorded on an electronic storage medium, or may be distributed via a communication network. Main information (first information) and auxiliary information (second information) are appropriately reproduced from a data group read from a storage medium or distributed via a communication network. The method includes: from the replaced data unit of the first information in data group data read from a storage medium or received via a communication network,
Reproducing the data-related value and the value of the data segment; and reproducing the original content of the replaced data unit based on the reproduced data-related value. The reproduced auxiliary information (second information)
You may make it display visually. That is,
Ancillary information (second information) embedded in the main information (first information) includes data relating to a data format such as a compression method of character data and waveform data, and various other data (ciphertext, key information, etc.). , ID, password, news text)
In such cases, they can be displayed on the screen, and when distributing these data via a communication network, they are displayed in a streaming manner according to the data that is distributed from moment to moment. can do.

In an embodiment, in a method for incorporating data of ancillary information into main information constituted by a data group consisting of a group of a plurality of data units, the method may be such that each specific data unit in the data group of the main information includes A step of distributing and incorporating data constituting the additional information, classifying the data of the main information into at least two characteristic groups according to the data characteristics, and incorporating the additional information in each of the groups in a redundant manner.
Thereby, in a plurality of data groups in the main information, the additional information can be incorporated redundantly, that is, redundantly, and the data is changed in some of the data groups of the main information and the additional information is extracted from the data group. Even if it is no longer possible, additional information can be extracted from other data groups. That is, it is sufficient to reproduce the accessory information from at least one of the plurality of property groups into which the accessory information is redundantly incorporated. If the main information is music performance information such as MIDI data, the key code value may be shifted for transposition, etc., so that appropriate measures should be taken. Can be.

As an example, a first step of distributing and incorporating data constituting cryptographic information indicating an encryption method in a specific data unit in a predetermined first data group of main information, A second step of performing encryption processing indicated by the encryption information on data constituting the main information in a predetermined second data group of the main information. According to this, in the first data group of the main information, encryption information necessary for the encryption process (in other words, information necessary for decryption at the time of reproduction) is dispersedly incorporated. Therefore, in the first data group of the main information, the encryption information can be incorporated into the first data group according to an appropriate algorithm without changing the data format by an electronic watermarking method. Then, the full-scale encryption process is performed on the data in the predetermined second data group in the main information in accordance with the encryption process indicated by the encryption information.

Reproducing the encrypted information from the first data group of the main information into which the encrypted information is incorporated, in order to reproduce the main information encrypted according to the above; Decoding the data of the second data group of the main information based on the information and reproducing the main information. A person authorized to decrypt the cryptographic information (that is, a legitimate user) can reproduce the cryptographic information by performing this method. Based on this, the second data group of the main information can be reproduced. The key information can be reproduced by decoding the data. When the main information is music information such as MIDI information, the degree of electronic watermarking of the encrypted information in the first data group in the main information can be made relatively weak, and the decryption of the encrypted information is authorized. Even if the user does not release the electronic watermarking of the encrypted information and reproduces the portion of the first data group of the main information,
Listening to the corresponding music can be done without much seriousness. On the other hand, since the second data group of the main information is fully encrypted, those who are not authorized to decrypt the encrypted information can obtain the encrypted information from the first data group. Therefore, the encrypted state of the second data group cannot be released. Therefore, any person can listen to music in the portion corresponding to the first data group, but can use only authorized music in the portion corresponding to the second data group. You can use them properly.

As an example, the main information may be key-on event data of MIDI data, program change data, control change data, or the like as described above. In the embodiments described later, the encryption information is described in terms of scramble data or scramble decode data, meaning that the main information is encrypted, that is, scrambled. The scramble data is data indicating a method of scrambling (that is, encryption). In other words, this data is data that can be used for decrypting scramble (that is, encryption) at the time of data reproduction. Therefore, the term "scramble decode data" is used in the same meaning. There may be several types of encryption (scramble) of MIDI data.
Encryption method by changing the note number of key-on data, or encryption method by replacing note and velocity of key-on data, or M
There is a method of performing encryption by changing the value of IDI interval data, or a method of performing encryption by changing channel data of key-on data. The encryption information, ie, the scramble data or the scramble decode data, indicates which type of encryption method is to be adopted.

As an example, the method of incorporating the scrambled data as the encryption information into the MIDI data as the main information is as follows. ,
It changes based on the contents of the segment of the scrambled data. Therefore, the least significant bit of the velocity data may or may not be changed according to the segment of the scrambled data to be incorporated in one velocity data. As a result, the contents of the scramble data are recorded in a distributed manner in the MIDI data group. When the main information is MIDI data, it is desirable that the data changed for incorporating the scramble data be velocity data or duration time data. This is because these data are data that does not require much rigor, so that a slight error in the value of the lower bit is not considered. That is, even if such information is slightly changed, in the case of audio data, it is hardly perceived (perceived) in terms of hearing. When the main information is waveform data,
What is necessary is just to change the least significant bit of the waveform data itself. The same applies to image data.

At the time of reproduction, if the main information (eg, MIDI data) of the portion in which the scrambled data is embedded is reproduced, it is assumed that the reproduction is performed without canceling the electronic watermarking by the segments of the scrambled data. Can be reproduced without causing any serious inconvenience. However, although the encrypted part maintains the format as MIDI data, its contents have been scrambled, so even if it is reproduced without decoding, it is no longer a musical performance. The body does not form. Therefore, unless the scrambled data embedded in the main information is reproduced using an authorized device or reproduction software, and the encrypted state is decoded using the scrambled data, the reproduction of the original musical performance can be correctly performed. Nothing is done.

In a case where the data constituting the cryptographic information is dispersedly incorporated in the predetermined first data group of the main information, the predetermined first data group of the main information data is divided according to its data characteristics. At least 2
It is preferable that the encryption information is classified into one characteristic group, and the encryption information is incorporated in each of the at least two characteristic groups in an overlapping manner. As yet another example,
In the first step, the encryption information may be incorporated for each characteristic group according to a unique algorithm for each characteristic group. Thereby, even if the data of a certain characteristic group in the first data group is changed collectively, even if the encryption information (scramble data) incorporated therein is deformed to be unreproducible, The encryption information embedded in the data of the characteristic group is reproduced, and can be used for decoding of the second data group. That is,
When the main information is MIDI data, the contents of the MIDI data may be interchanged or the key code may be shifted for transposition or the like on a channel-by-channel basis. It is no longer possible to detect and reproduce the scrambled data from the main information. Therefore, as described above, the MIDI data (main information) is classified into two characteristic groups according to some classification condition such as each channel or each appearance timing of program change data, and the encryption information is redundantly divided for each characteristic group. We decided to incorporate it. As a result, even if the data is rewritten by replacing the channel information as it is or the data is changed in units of characteristic groups, the encryption information incorporated in any of the characteristic groups in which the data has not been changed is changed. By detecting and reproducing, the encryption in the second data group can be released.

In another embodiment, a first data group constituted by a group of a plurality of data units is provided.
A method of incorporating data of the second information into the information of the first information, wherein the step of selecting one data unit from the first information; and the step of selecting the first data unit from the data group constituting the second information. Selecting a data segment to be incorporated into one data unit of information; and changing the content of the selected data unit of the first information according to a predetermined algorithm including a value of the data segment as a parameter. Wherein the content of the selected data unit is modified according to the algorithm, and the value of the data segment of the second information is potentially embedded in the selected data unit. It is characterized by the following. According to this, the second information, that is, the auxiliary information is incorporated by changing the content of the selected data unit in the data of the first information, that is, the main information. Not only the incorporation but also the partial change of the first information, that is, the main information can be performed.

In still another embodiment, there is provided a method for incorporating data of ancillary information into main information constituted by a data group consisting of a group of a plurality of data units, wherein one data unit is extracted from the main information. Selecting, and a data segment to be incorporated into one data unit of the main information from a data group constituting the additional information, wherein a data amount of the selected data segment is variable And changing the content of the selected data unit of the main information according to a predetermined algorithm including the value of the data segment as a parameter, wherein the algorithm reduces the data amount of the data segment selected in the previous step. According to the content of the selected data unit Change in accordance with the algorithm is applied,
And the value of the data segment of the additional information is potentially incorporated in the selected data unit. According to this, it is possible to variably adjust the data amount of the data segment of the auxiliary information to be incorporated in one data unit of the main information. Therefore, an appropriate data segment size (data amount) can be selected in consideration of the overall data amount, type, and the like of the attached information.

A method according to yet another embodiment is a method for transmitting information, comprising providing, as information to be transmitted, main information constituted by a data group consisting of a plurality of data units; Providing additional information consisting of a plurality of data segments as additional information to be incorporated into the data constituting the main information, and identifying the provided main information according to a predetermined algorithm when transmitting the main information Incorporating each of the data segments of the provided additional information into each of the plurality of data units, and transmitting the main information including the additional information to a network. Thereby, the additional information embedded in the main information as electronic watermarking information can be transmitted to the streaming via the network.

A method according to still another embodiment is a method of receiving information transmitted via a network as described above and reproducing main information and auxiliary information from the information, wherein Detecting the data unit in which the data segment of the additional information is incorporated from the data received via the data unit, and performing decoding in accordance with the predetermined algorithm, thereby converting the additional information from the detected data unit. Separating and reproducing the data segment and the data unit of the main information, respectively. Thereby, when the accessory information embedded in the main information as the electronic watermark information is transmitted to the streaming via the network, it is decoded in real time, and the electronic watermark is decoded, that is, the accessory information is decoded. Playback can be streamed.

A method according to yet another embodiment comprises the step of selectively or partially encrypting music performance information coded in a normal form, wherein a part of the music performance information is encrypted. It is characterized by selectively performing encryption. In a recording medium on which music performance information is recorded according to this method, a predetermined portion of the music performance information is coded in a normal format, and another special portion of the music performance information has a special secret encryption. Therefore, only the part of the music performance information coded in the normal format can be reproduced as it is, and the specially encrypted part is an encrypted part. It can be played back when decoded. This allows anyone to play back the music performance information coded in the normal format, so that the performance of that portion can be used as a preview performance. The user (authorized person) can properly use the entire music performance without any problem by decoding (decoding) the encrypted portion, and there is no inconvenience.

In the above, a rough introductory explanation of the embodiment has been given mainly from the viewpoint of a method. However, the present invention can be constructed and implemented not only as a method invention but also as an apparatus invention. Of course you can. In addition, the present invention can be implemented in the form of a computer program, and can also be implemented in the form of a recording medium storing such a computer program. Furthermore, a recording medium itself that records a data group in which auxiliary information is incorporated in main information in the form of electronic watermark information according to the method or apparatus of the present invention is also included in an embodiment of the present invention. It is.

[0027]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 is a block diagram showing the overall configuration of an electronic musical instrument operating as an electronic information processing system according to one embodiment of the present invention. A microprocessor unit (CPU) 21 controls the operation of the electronic musical instrument as a whole. Various devices are connected to the CPU 21 via the bus 2M.

The CPU 21 controls the overall operation based on various programs and various data in the ROM 22 and the RAM 23 and the musical tone control information (MIDI data) fetched from the external storage device, and stores the additional information in the fetched MIDI data. Is stored in a distributed manner, the MIDI data in which the auxiliary information is stored in a distributed manner is taken in from a floppy disk, and the auxiliary information is detected therefrom. In this embodiment, a floppy disk drive 24, a hard disk drive 25, a CD-
The ROM drive 26 and the like will be described as an example, but other magneto-optical disk (MO) drives, PD drives, and the like may be used. Further, various information such as tone control information may be fetched from a server computer 29 or the like on the communication network 28 via the communication interface 27, or other M information may be fetched via the MIDI interface 2A.
MIDI data or the like may be fetched from the IDI device 2B or the like. The CPU 21 supplies the tone generator circuit 2J with the MIDI data fetched from the external storage device or the MIDI data generated based on the key pressing operation of the keyboard 2C. Note that the tone generation process may be performed using a sound source circuit connected to the outside.

The ROM 22 stores various programs (system programs, operation programs, etc.) and various data of the CPU 21, and has a read-only memory (R
OM). The RAM 23 temporarily stores various data generated when the CPU 21 executes a program, and is a random access memory (RA).
M) predetermined address areas are respectively allocated and used as registers, buffers, flags, tables, and the like.

Further, the operation program may be stored in an external storage device such as the hard disk device 25. Also, without storing the operation programs in the ROM 22, these operation programs are stored in an external storage device such as the hard disk device 25, and are stored in the RAM 2.
3, the CPU 21 may perform the same operation as when the operation program is stored in the ROM 22. By doing so, it is possible to easily add an operation program or upgrade the version. A CD-ROM may be used as one of the removable external storage media. The CD-ROM may store various data such as automatic performance data, chord progression data, musical sound waveform data, and video data, and an arbitrary operation program.
The operation programs and various data stored in the CD-ROM can be read out by the CD-ROM drive 26 and transferred to and stored in the hard disk device 25. This makes it possible to easily perform new installation and version upgrade of the operation program.

The communication interface 27 is connected to the data and address bus 2M, and can be connected to various communication networks 28 such as a LAN (local area network), the Internet, and a telephone line via the communication interface 27. May be exchanged with the server computer 29. Accordingly, when the operation program and various data are not stored in the hard disk device 25, the operation program and various data can be downloaded from the server computer 29. In this case, a command for requesting downloading of an operation program and various data is transmitted from the automatic performance device, which is a musical sound generation device serving as a client, to the server computer 29 via the communication interface 27 and the communication network 28. The server computer 29 transmits predetermined operation programs and data to the automatic performance device via the communication network 28 in response to the command. The automatic performance device receives these operation programs and data via the communication interface 27 and stores these programs and data in the hard disk device 25. Thus, the download of the operation program and various data is completed.

The present invention may be implemented by a commercially available personal computer or the like in which an operation program and various data corresponding to the present invention are installed. In this case, the operation program and various data corresponding to the present invention may be provided to the user in a state where the program is stored in a storage medium such as the CD-ROM 26 or a floppy disk which can be read by a personal computer. The program may be provided to the user in a state of being stored in a storage medium that can be read by the personal computer. When the personal computer or the like is connected to a communication network such as a LAN, the Internet, or a telephone line, the operation program or various data may be provided to the personal computer or the like via the communication network.

The keyboard 2C is provided with a plurality of keys for selecting the pitch of a musical tone to be produced, and has key switches corresponding to the respective keys. It has touch detection means. The keyboard 2C is a basic operator for music performance, and it goes without saying that other keyboard operators may be used. The key press detection circuit 2D includes a key switch circuit provided corresponding to each key of the keyboard 2C for designating the pitch of a musical tone to be generated. The key press detection circuit 2D detects a change from the key release state to the key press state of the keyboard 2C and outputs a key-on event,
A key-off event is output by detecting a change from a key-pressed state to a key-released state, and a note number indicating the pitch of a key for each key-on event and key-off event is output. In addition, the key press detection circuit 2D discriminates a key press operation speed and a press force at the time of key press and outputs velocity data and after touch data.

The panel switch 2E is used for automatic performance start /
It includes a stop switch, a pause (pause) switch, and various switches for selecting, setting, and controlling a tone, a volume, an effect, and the like. The switch detection circuit 2F is provided corresponding to each switch group on the panel switch 2E, and outputs a switch event corresponding to the operation state of each switch group to the CPU 21 via the bus 2M.
The display circuit 2H displays various information such as the control state of the CPU 21 and the contents of the setting data on the display 2G. In this embodiment, copyright indication data, song title,
Composer information, creation date, lyrics, news text, model name (hardware name), text data such as ID, etc. are displayed. The display 2G is composed of a liquid crystal display panel (LCD) or the like, and its display operation is controlled by the display circuit 2H.

The tone generator 2J is capable of simultaneously generating tone signals on a plurality of channels, and transmits tone control information (MIDI data such as note-on, note-off, velocity, pitch data, tone number, etc.) given from the CPU 21. And generates a tone signal based on the tone control information. In the tone generator circuit 2J, a tone signal can be simultaneously generated on a plurality of channels by using one circuit in a time-division manner to form a plurality of tone channels, or one tone channel is constituted by one circuit. It may be of the type as described below. Also, any tone signal generation method in the tone generator circuit 2J may be used. For example, a memory reading method (waveform memory method) for sequentially reading out tone waveform sample value data stored in a waveform memory in accordance with address data that changes in accordance with a pitch of a musical tone to be generated, or a phase angle parameter An FM method for executing a predetermined frequency modulation operation as data to obtain tone waveform sample value data, or an AM method for executing a predetermined amplitude modulation operation using the address data as phase angle parameter data to obtain tone waveform sample value data, or the like. May be appropriately adopted. In addition to these methods, a physical model method of synthesizing a musical tone waveform by an algorithm that simulates the sounding principle of a natural musical instrument, a harmonic synthesis method of synthesizing a musical tone waveform by adding a plurality of harmonics to a fundamental wave, A formant synthesis method for synthesizing a musical tone waveform using a formant waveform having a specific spectral distribution, an analog synthesizer method using VCO, VCF, and VCA may be employed. In addition, the sound source circuit is not limited to the one using dedicated hardware, and the sound source circuit may be formed using a DSP and a microprogram.
And a software program may constitute the tone generator circuit.

The timer 2N generates a tempo clock pulse for counting time intervals and setting a tempo for automatic performance. The frequency of the tempo clock pulse is determined based on a tempo setting switch in the various switches 2E and tempo data as shown in FIG. 3 included in the performance data in advance. The tempo clock pulse from the timer is given to the CPU 21 as an interrupt command, and the CPU 21 executes various processes during the automatic performance by the interrupt process. The effect circuit 2K applies various effects to the tone signal from the tone generator 2J, and outputs the tone signal with the effect to the sound system 2L. The tone signal to which the effect is given by the effect circuit 2K is generated through a sound system 2L including an amplifier and a speaker.

Next, an example of the operation when the electronic information processing system according to the present invention adds electronic information and simultaneously performs an encryption process will be described. FIG. 3 shows the MID when the electronic musical instrument 1 operates as an electronic information processing system.
It is a flowchart figure which shows an example of I data edit processing. First, in this case, the electronic musical instrument 1 stores an electronic signature, ie, copyright display data, which is a part of the header information, in the MIDI data read from the floppy disk drive 24 in a distributed manner, and maintains the MIDI format. The case where the encryption process is performed will be described.

First, in step 31, the contents of the additional information to be distributed and written in the MIDI data string are determined. In the present embodiment, a case will be described in which an electronic signature (copyright display data) is embedded in a MIDI data string in a distributed manner as attached information. For example, "COPYRIGHT @ YMH @ 1996" may be used as copyright indication data.
Are written in the MIDI data string in a distributed manner, these character strings are input using the panel switch 2E. Here, △ means blank. Step 3
Since the electronic signature to be written, that is, the character string of the attached information has been determined in step 1, a 4-bit data string relating to the electronic signature is obtained in step 32. For example, by using the panel switch 2E, "COPYRIGHT {YMH}
When "1996" is input, it is converted into a data string of ASCII character codes. In this case, each character is “C” = “43H”, “O” = “4FH”,
“P” = “50H”, “Y” = “59H”, “R” =
"52H", "I" = "49H", "G" = "47"
H ”,“ H ”=“ 48H ”,“ T ”=“ 54H ”,
"△" = "20H", "Y" = "59H", "M" =
“4DH”, “H” = “48H”, “△” = “20”
H "," 1 "=" 31H "," 9 "=" 39H ",
It is represented by a series of ASCII 4-bit data such as “9” = “39H” and “6” = “36H”. In addition, in the number written like "36H",
The H at the end of the number indicates that the number is in hexadecimal.

Next, in step 33, information to be added as an electronic signature, that is, the ASC obtained in step 32
The data string of the 4-bit configuration of II is stored in the 4-bit register BR.
To be stored. For example, “Y” = “59H”, “M” =
When the characters “4DH” and “H” = “48H” are sequentially stored in the MIDI data string, the 4-bit register BR stores “0101B” and “100” as shown in FIG.
1B "," 0100B "," 1101B "," 0100
B "and" 1000B "are sequentially stored. In addition, in a number described as “1000B”, B at the end of the number indicates that the number is represented in binary. In step 34, the upper three bits stored in the 4-bit register BR are set as the note area number NA, and the least significant bit (LSB) is set as the velocity area number VA. Therefore, the first four bits of “Y” = “59H” of the electronic signature: “0101B”
In the case of, NA = 2, VA = 1, and the last 4 bits: “10
01B ”, NA = 4, VA = 1, and the first four bits of the digital signature“ M ”=“ 4DH ”:“ 0100 ”
B ", NA = 2, VA = 0, last 4 bits:
In the case of “1101B”, NA = 6, VA = 1, and the first four bits of “H” = “48H” of the digital signature: “01”
00B ", NA = 2, VA = 0, the last four bits: In the case of" 1000B ", NA = 4, VA = 0.

Next, at step 35, various MIDs such as key-on event data, program change data and control change data are selected from the MIDI data string (Standard MIDFile: SMF).
The I data is sequentially taken out. That is, since the MIDI data sequence basically includes key-on event data including a key-on status byte, a key code byte, and a velocity byte, and other program change event data and control change event data, in step 35, Such MIDI data is taken out in order.

In step 36, the retrieved MIDI
It is determined whether or not the data is the key-on event data KON. If the data is the key-on event data (YES), the processing of the next step 37 and subsequent steps is performed, and if not (N
In the case of O), the process proceeds to step 3H. Therefore, step 3
If the MIDI data extracted in step 5 is key-on event data, a MIDI data string SMF1 composed of key-on event data as shown in FIG. 1A is obtained. The MIDI data string SMF1 of the key-on event data is composed of a combination of the duration time D and the key-on event data. In step 37, the data of each byte in the key-on event data is stored in the corresponding key code register b and velocity register c, respectively. That is, the value of the key code byte in the key-on status byte of the key-on event data, that is, the key code is stored in the key code register b, and the value of the velocity in the velocity byte is stored in the velocity register c.

In step 38, a difference value between the key code of the previous key-on event data and the velocity is obtained, and the difference value is stored in the key code difference value register dkey and the velocity difference value register dvel, respectively. That is, the key code of the current key-on event data is stored in the key code register b, and the key code of the previous key-on event data is stored in the previous value register b0. From the value of the key code register b to the previous value register b0
Is stored in the key code difference value register dkey. The velocity register c stores the velocity of the current key-on event data, and the previous value register c0 stores the velocity of the previous key-on event data. Therefore, similarly, the difference value obtained by subtracting the value of the previous value register c0 from the value of the velocity register c is stored in the velocity difference value register dvel. In the case of the MIDI data string SMF1 shown in FIG. 1A, the values of the key code difference value register dkey and the velocity difference value register dvel obtained by the calculation in step 38 are as shown in FIG. 1B. In step 39, the current key code value, that is, the value of the key code register b, is stored in the previous value register b0, and the current velocity value, that is, the value of the velocity register c is stored in the previous value register b0, in preparation for the next step 38. Store it in register c0.

In step 3A, it is determined whether or not the value of the key code difference value register dkey is smaller than 8.
If it is smaller, the process proceeds to the next step 3B, and if it is 8 or more, the process proceeds to step 3G. In step 3B, it is determined whether or not the value of the velocity difference value register dvel is smaller than 32. If the value is smaller, the process proceeds to the next step 3C, and if it is 32 or more, the process proceeds to step 3G. That is, if both steps 3A and 3B determine NO, the key-on event data is determined to be data not to be replaced, and the least significant bit of the register c is corrected to “0” in step 3G, ie, The process proceeds to step 3H after setting the velocity value to an even number. Thus, when the velocity value is an even number, it is possible to easily determine at the time of data restoration that the key-on event data is data not to be replaced and has not been corrected.

In step 3C, different replacement operations are performed depending on whether the value of the key code difference value register dkey is positive or 0 or negative. That is, when the value of the key code difference value register dkey is positive or 0, the sum of the value obtained by multiplying the note area number NA by 8, the value of the key code difference value register dkey, and the constant 64 is obtained. Is stored in the first key code register b1. Since the maximum value of the three-bit note area number NA is "7" and the minimum value is "0", under this condition,
The minimum value of the register b1 is “64”. On the other hand, when the value of the key code difference value register dkey is negative,
The value obtained by multiplying the note area number NA by eight is subtracted from the constant 63, the value of the key code difference value register dkey is added, and the result is stored in the first key code register b1. At this time, the key code difference value register dk
Since ey is a negative value, the value of the key code difference value register dkey is subtracted from the constant 63 as a result.
Under this condition, the value of the register b1 does not become larger than “63”.

In step 3D, different replacement operations are performed depending on whether the value of the velocity difference value register dvel is positive or 0 or negative. That is, when the value of the velocity difference value register dvel is positive or 0, the sum of the value obtained by multiplying the velocity area number VA by 32, the value of the velocity difference value register dvel, and the constant 64 is obtained, and the result is referred to as the second. 1 is stored in the velocity register c1. Under this condition, the minimum value of the register c1 is "6
4 ". If the value of the velocity difference register dvel is negative, the velocity area number V
The value obtained by multiplying A by 32 is subtracted, the value of the velocity difference value register dvel is added, and the result is stored in the first velocity register c1. At this time, since the velocity difference value register dvel is a negative value, the value of the velocity difference value register dvel is eventually subtracted from the constant 63. Under this condition, the value of the register c1 does not become larger than “63”.

In step 3E, the value of the first key code register b1 is set as a new key code value, and the value of the first velocity register c1 is set as a new velocity value.
Modify DI data. Then, in step 3F, the first
After correcting the least significant bit of the velocity register c1 to "1", that is, correcting the value of the velocity to an odd number, the process proceeds to step 3H. Thus, when the value of the velocity is an odd number, it can be easily determined at the time of data restoration that the key-on event data has been corrected based on the attached information. In step 3H, it is determined whether or not the processing from step 33 to step 3G has been completed for all attached information. If the processing has been completed (YES), the MIDI data editing processing has been completed. Returns to step 33, and performs a series of processes for the next attached information.

For example, in the case of FIG. 1, the first key-on event data (91, 100, 100) is not corrected because it is the first key-on event data. The second key-on event data (91, 101, 102) is converted into the second key-on event data (91, 81, 99) as shown in FIG. . Similarly, the third key-on event data (91, 103, 102) is also the third key-on event data as shown in FIG.
Is converted to the key-on event data (91, 98, 97). Then, the fourth key-on event data (91, 120, 70) is, as shown in FIG.
The absolute value of the key code difference value register dkey is "17"
And 8 or more, the result is NO in step 3A,
The key-on event data (91, 120, 70) is excluded from the replacement target and passes through step 3G as shown in FIG.
This is the fourth key-on event data as shown in FIG. Similarly, the fifth to eighth key-on event data is converted like the fifth to eighth key-on event data in FIG. 1D. In this case, in the case of the second and third key-on event data, the value of the velocity is converted to an odd number by the process of step 3F. Note that the program change event occurs at a relatively low frequency as compared to a note-on event to which additional information is added, and means that the instrument changes after the program change, so that the position is edited starting from that position. Since it can be said that the MIDI data is a unit having a high possibility, if the extracted MIDI data is a program change event, the MIDI data may be immediately terminated and the MIDI data may be edited from the beginning of the attached information.

FIG. 5 enumerates the possible states of the values of the registers b1 and c1 obtained according to the first embodiment. In FIG. 5, the vertical axis indicates the register b
Assign the possible values of the key code stored in 1,
The abscissa axis is assigned values that can be taken by the velocity data stored in the register c1, and an orthogonal coordinate system having the origin between 63 and 64 of each value is configured. by this,
The key code in the key-on event data is either high (positive value) or low (negative value), and the velocity increases (positive value) or decreases (negative value). Four types of combinations will be assigned to each quadrant of this rectangular coordinate system. Each quadrant is assigned 16 pieces of 4-bit data serving as additional information. That is, as shown in FIG. 5, the key code increases and the velocity increases, the key code increases and the velocity decreases, the key code decreases and the velocity increases, and the key code increases. Each time the velocity decreases and the velocity decreases, it corresponds to each quadrant. Of the 4-bit configuration information assigned to each quadrant, the least significant bit is assigned to the velocity on the horizontal axis, and the upper 3 bits are assigned to the key code on the vertical axis. Accordingly, when the key code becomes higher and the velocity increases, the key code is allocated to the first quadrant of the rectangular coordinates, and the key code axes 64-127 are divided so as to correspond to eight pieces of additional information from 000 to 111. , And the velocity axes 64-127 are divided so as to correspond to two additional information 0 and 1. When the key code becomes higher and the velocity decreases, it is assigned to the second quadrant of the rectangular coordinates, and the key code axes 64 to 127 become 000 to 11
It is divided so as to correspond to eight pieces of attached information up to 1, and the velocity axis 63-0 is divided so as to correspond to two pieces of attached information 0 and 1. When the key code becomes lower and the velocity decreases, it is assigned to the third quadrant of the rectangular coordinates, and the key code axes 63-0 are divided so as to correspond to eight pieces of additional information from 000 to 111, and the velocity is reduced. The axis 63-0 is divided so as to correspond to two pieces of additional information 0 and 1. When the key code becomes lower and the velocity increases, the key code is assigned to the fourth quadrant of the rectangular coordinates, and the key code axes 63-0 are divided so as to correspond to eight pieces of additional information from 000 to 111, and the velocity is increased. The axes 64 to 127 are divided so as to correspond to two additional information of 0 and 1.

In this case, as shown in FIG. 6, there are eight values for the key code corresponding to each piece of attached information and 32 values for the velocity.
As in B, the condition that the value of the key code difference value register dkey must be smaller than 8, and the value of the velocity difference value register dvel must be smaller than 32 is included. Therefore, the key code increases or decreases with a value smaller than 8, and the velocity becomes 3
If the value increases or decreases by a value smaller than 2, the additional information of each quadrant in FIG. 5 is selected, and the original key code and velocity are selected according to the value of the additional information, the key code difference value and the velocity difference value. Is edited. In this case,
For velocity, the least significant bit is processed by steps 3G and 3F to indicate whether it is an edited value, and the edited velocity value is eventually only an odd 16 Becomes

Next, a description will be given of a MIDI data restoring process for detecting, ie, restoring, the electronic information, ie, the digital signature data, given by the MIDI data editing process of FIG. FIG. 4 is a flowchart illustrating an example of a case where the electronic musical instrument 1 operates as a MIDI data restoration device. In this case, the floppy disk drive 25
It is assumed that part of the above-described header information (electronic signature, that is, copyright display data) is dispersedly recorded in the MIDI data read from the. In the following embodiment,
The operation of detecting the copyright display data and displaying it on a monitor or the like will be described. First, in step 41, a MIDI data string from which an electronic signature is to be detected, that is, a MIDI data string to which an electronic signature has been added by the electronic information adding process in FIG. 3 (Standard MIDI Fi
le: SMF), and sequentially retrieves data such as key-on event data, program change data, and control change data.

At step 42, the extracted MIDI
It is determined whether or not the data is key-on event data KON. If the data is key-on event data (YES), the process proceeds to the next step 43, and if not (NO), the process proceeds to step 4C. Therefore, if the MIDI data extracted in step 41 is key-on event data, a key-on event MIDI data string SMF2 as shown in FIG. 1 (F) is created. In step 43, the data of each byte in the key-on event data is stored in the corresponding key code register b and velocity register c, respectively. That is, the key code in the key code byte is stored in the key code register b, and the velocity in the velocity byte is stored in the velocity register c.

At step 44, the velocity register c
Is determined as to whether or not the least significant bit is “1”, that is, whether or not the data is key-on event data with attached information (electronic signature information). If YES, the process proceeds to the next step 45, and if not ( If NO), proceed to Step 4C. Step 45, Step 46, Step 4
In step 9 and step 4A, the restoration key code register b2 and the restoration velocity register c2 are based on the stored values of the key code register b, the previous key code register b0, the velocity register c, and the previous velocity register c0 of the successive key-on event data. , Note area number NA and velocity area number VA, respectively. At this time, when the value of the key code register b is equal to or greater than 64 and when the value is smaller than 64, respective values are obtained using different arithmetic expressions.

In step 45, the inverse calculation of the replacement expression in step 3C (FIG. 3) is performed. That is, when the value of the key code register b is 64 or more, a constant 64 is subtracted from the value of the key code register b, and the modulo of the subtraction value at 8 (the remainder obtained by dividing the subtraction value by 8) is obtained. , Dkey. Then, by adding this dkey to the previous key code register b0, a key code restoration value is obtained and stored in the restoration key code register b2. On the other hand, when the value of the key code register b is smaller than 64, the constant 63 is subtracted from the value of the key code register b, and the modulo at 8 of the subtraction value is obtained, thereby reproducing the dkey. And this dkey
Is added to the previous key code register b0 to obtain a repair value of the key code.
Store in 2.

In step 46, the inverse of the replacement expression in step 3D (FIG. 3) is performed. That is, when the value of the velocity register c is 64 or more, the constant 64 is subtracted from the value of the velocity register c, and the modulo of the subtraction value at 32 (the remainder obtained by dividing the subtraction value by 32) is obtained. To play. Then, by adding this dvel to the previous velocity register c0, a restored value of the velocity data is obtained, and the restored value is stored in the restored velocity register c2. On the other hand, when the value of the velocity register c is smaller than 64, the constant 63 is subtracted from the value of the velocity register c, and the modulo at 32 of the subtracted value is obtained, thereby reproducing dvel. Then, by adding this dvel to the previous velocity register c0, a restored value of the velocity data is obtained, and the restored value is stored in the restored velocity register c2.

In step 47, the MIDI data is restored using the value of the restoration key code register b2 as the key code value and the value of the restoration velocity register c2 as the velocity value. In step 48, the next step 45
In preparation for the processing of step 46, the value of the restored key code, that is, the value of the restored key code register b2, is stored in the previous value register b0, and the value of the restored velocity, that is, the value of the restored velocity register c2, is stored in the previous value register. Store in c0. In step 49, step 3
The NA is reproduced by performing the reverse operation of the substitution formula of C (FIG. 3). That is, when the value of the key code register b is 64 or more, a constant 64 is subtracted from the value of the key code register b, a quotient obtained by dividing the subtracted value by 8 is obtained, and the obtained quotient is set as a note area number NA. On the other hand, key code register b
Is smaller than 64, the value of the key code register b is subtracted from the constant 63, and the quotient obtained by dividing the subtracted value by 8 is obtained as the note area number NA. In step 4A, the NA is reproduced by performing the inverse calculation of the replacement expression in step 3D (FIG. 3). That is, when the value of the velocity register c is 64 or more, the velocity register c
Is subtracted from the value of, a quotient obtained by dividing the subtracted value by 32 is obtained, and the obtained quotient is set as a velocity area number VA.
On the other hand, if the value of the velocity register c is smaller than 64, the value of the velocity register c is subtracted from the constant 63, and the quotient obtained by dividing the subtracted value by 32 is obtained, and the quotient is set as the velocity area number VA.

In step 4B, note area number N
Auxiliary information consisting of a 4-bit data string in which A is the upper three bits and velocity area number VA is the least significant bit is obtained. In step 4C, it is determined whether or not the restoration of all MIDI data has been completed.
The IDI data restoring process is terminated. If not, the process returns to step 41, and the MIDI data restoring process is performed again. When the above-described series of restoration processing is completed, a part of the header information (digital signature, that is, copyright display data) is displayed on the monitor, but the steps are omitted here.

For example, the MIDI data string SMF2 of the key-on event shown in FIG. 1E is the same as the MIDI data string SMF2 of the key-on event shown in FIG.
MIDI data string SM of the key-on event in FIG.
Based on F2, the MIDI data string SMF3 as shown in FIG. 1 (F) is restored, and additional information as shown in FIG. 1 (G) is extracted. First, in the first key-on event data (91, 100, 100) in FIG. 1 (G), since the least significant bit of the velocity is "0", that is, an even number, the value as it is becomes the key-on event data. Next, in the second key-on event data (91, 81, 99), the least significant bit of the velocity is "1", that is, an odd number, and is 64 or more. Therefore, the MIDI data restoration process of FIG.
This is converted to the second key-on event data (91, 101, 103) as shown in FIG. Similarly,
Third key-on event data (91, 98, 97)
Is also converted to the third key-on event data (91, 103, 104) as shown in FIG. And
The fourth key-on event data (91, 120, 7
0) is the key-on event data because the least significant bit of the velocity is "0", that is, an even number. Similarly, the fifth to eighth key-on event data as shown in FIG.
It is converted like the 5th to 8th key-on event data in (F). In this case, for the second and third key-on event data, step 3 in FIG.
Since the velocity value is converted to an odd number by the processing of F, the key-on event data of FIG. 1A before the velocity value of the key-on event data shown in FIG. Is about 1 to 2 larger than the velocity value. However,
Since such an error in the velocity value has little effect on the human ear, it can be said that the error is in a range that can be almost ignored. Also, based on the key-on event data of FIG. 1 (G), digital signature information (copyright display data) as shown in FIG. 1 (H) is reproduced. The electronic signature information thus restored is displayed on a display device (not shown) or the like.

In the above-described first embodiment, a case has been described where 1-bit additional information is assigned to the velocity and 3-bit additional information is assigned to the key code. However, it goes without saying that other combinations of bits may be used. . For example,
Two-bit additional information may be assigned to each of the velocity and the key code, or 4-bit additional information may be assigned to only the velocity. In the above-described first embodiment, a case has been described in which the note direction is divided into eight equal parts and the velocity direction is divided into two equal parts to record additional information having a 4-bit configuration. , The amount of additional information can be increased. For example, if both notes and velocities are divided into 16 equal parts, additional information of an 8-bit configuration can be added to one key-on event, and one byte of an ASCII code can be expressed by one event key-on. .
In this case, the key code difference value register dke
If the values of y and the velocity difference value register dvel are not less than 4, there is a restriction that additional information cannot be assigned to the key-on event. Therefore,
The frequency of occurrence of the key code difference value and the velocity difference value may be acquired in advance, and the number of divisions into which the most attached information can be embedded may be selected according to the frequency. Further, in the above-described first embodiment, the case where the relationship as shown in FIG. 5 is formed by the arithmetic expression has been described.
A table having the relationship shown in FIG. 5 may be created in advance, and a predetermined value may be obtained by converting each value into a table. In this case, the accessory information may not be regularly arranged as shown in FIG. 5, but may be randomly arranged.

In the first embodiment, in the MIDI data read from the floppy disk drive 24, an electronic signature, ie, copyright display data, which is a part of the header information, is converted into key-on event data in a relatively large data unit. The case where encryption processing is performed (electronic watermarking is performed) while the MIDI format is maintained while being distributed and stored therein has been described. In this case, some of the key-on event data whose key code and velocity content are almost rewritten appear, so that the MIDI data can be rewritten without performing predetermined MIDI data restoration processing.
Even when the data reproducing process is performed, the reproduced musical sound is completely unpleasant. In view of this point, in the second embodiment described below, “electronic watermarking” is performed in a different manner from the above. In the second embodiment, scrambled decode data indicating which encryption process among a plurality of encryption processes has been applied is embedded in the first part of the MIDI data, and the encryption process is performed there. Instead, normal MIDI data can be reproduced, and the remaining MIDI data is scrambled in accordance with the scrambled decoded data.
I data cannot be reproduced.

FIG. 7 is a diagram showing the contents of scramble decode data embedded in MIDI data. The scramble decode data is 2-byte data. The upper 4 bits of the first byte indicate the algorithm, the lower 4 bits indicate the number of events to be scrambled, that is, the count number, and the 8 bytes of the second byte. Indicates a value corresponding to the algorithm. Here, the type of algorithm is to change the note number of the key-on data, to change the note and velocity of the key-on data, to change the interval data, to change the channel data of the key-on data, etc. There is. The count number is two ASCII characters, that is, 1 as described above.
This indicates how many scramble processes are to be performed from the top of the key-on event data of the number necessary to create 6-bit data.

In the case of the first embodiment, since four bits of data can be embedded in one key-on event data, the additional information for one ASCII character is included in the two key-on event data. Although embedding was possible, in the second embodiment, the case where only one bit of data can be embedded in one key-on event data will be described. Therefore, the maximum value of the number of events to be corrected is 16. The value differs depending on the corresponding algorithm. For example, in the case of an algorithm that changes the note number of the key-on data, the value is the degree of change, that is, the transpose value (corrected note value), and the interval data is changed. In the case of the algorithm, it is the correction value to be changed, and when the channel data of the key-on data is changed, it is the corrected channel value. Thus, it is assumed that a total of 16 types of algorithms are defined. In addition, as one of the 16 types of algorithms, the first algorithm described above is used.
It goes without saying that the scrambling process according to the embodiment may exist.

FIG. 8 is a flowchart showing a MIDI editing process 2 which is another example of the MIDI editing process when the electronic musical instrument 1 operates as an electronic information processing system. First, in this case, the electronic musical instrument 1 stores the digital data read from the floppy disk drive 24 with the electronic signature, that is, the copyright display data, which is a part of the header information, dispersed therein, and also stores the 16-bit data described above. The scramble decode data is stored. First, in step 81, the contents of scramble to be distributed and written in the MIDI data string are determined. That is, it is assumed that the scramble processing based on which algorithm in FIG. 8 is performed is set in advance by the panel switch 2E. Since the content of the scramble is determined in step 81, a decoded data sequence of the scramble is obtained in step 82. For example, when the fifth algorithm is selected by the panel switch 2E,
Data "0101B" indicating the type of the algorithm
Then, an 8-bit data sequence consisting of the count number "1001B" modified by the algorithm is distributed and recorded in the MIDI data sequence as a scrambled decoded data sequence.

Next, in step 83, one byte of the scrambled decoded data string obtained in step 82 is stored in the byte register BR. And step 84
Then, each bit of the scramble decode data stored in the byte register BR is inverted to create another 8-bit bit string. For example, as shown in FIG.
In the case of “001B”, a bit string “10100110B” as shown in FIG. Next, in step 85, the MIDI data string (Standard M
Various MIDI data such as key-on event data, program change data, and control change data are sequentially extracted from IDIFile (SMF).
That is, since the MIDI data string is basically composed of key-on event data including a key-on status byte, a key code byte, and a velocity byte, and other program change event data and control change event data, in step 85, Such MIDI data is taken out in order.

At step 86, the retrieved MIDI
It is determined whether or not the data is key-on event data KON. If the data is key-on event data (YES), the process proceeds to the next step 87, and if not (NO), the process proceeds to step 8D. Therefore, if the MIDI data extracted in step 85 is key-on event data, a MIDI data string SMF1 composed of key-on event data as shown in FIG. 12A is obtained.
MIDI data string SMF of this key-on event data
Reference numeral 1 denotes a combination of a duration time D and key-on event data. In step 87, the data of each byte in the key-on event data is stored in the corresponding register a, b, c. That is, the channel number in the key-on status byte in the key-on event data is stored in the channel register a, the key code in the next first data byte (key code byte) is stored in the key code register b, and the second data The velocity in the byte (velocity byte) is stored in the velocity register c.

In step 88, one bit is extracted from the head of the bit string created in step 84 and stored in the first bit flag BF1. Next Step 89
In step 87, the values stored in the registers a, b, and c in step 87 are calculated according to a predetermined function, and the bit data obtained based on the calculation result is inverted to form a second bit flag BF
2 is stored. In this embodiment, each register a,
Let modulo 2 of the sum of the values of b and c be a predetermined function.
That is, the function f1 (a, b, c,) = (a + b + c)
mod2. For example, in the case of the key-on event MIDI data sequence SMF1 as shown in FIG. First, when a calculation is performed using a predetermined function f1 (a, b, c) of each key-on event data, the result is as shown in FIG. That is, if the value of (a + b + c) is even, it is "0", and if it is odd, it is "1". Then, these inverted bits are stored in the second bit flag BF2, and FIG.
(C).

In step 8A, it is determined whether the first bit flag BF1 and the second bit flag BF2 obtained in steps 88 and 89 are equal, and if they are equal (YES), the next step 8B and Step 8
Perform the processing of C, and if not equal (NO), step 8
Jump to E. In step 8B, since it is determined that the first bit flag BF1 is equal to the second bit flag BF2, "1" is added to the value of the velocity register c, that is, the least significant bit of the velocity data. Then, in step 8C, M is set based on the value of the register c.
The velocity value constituting the key-on event data in the IDI data string is updated. That is, the velocity value is increased by one. For example, in the case of FIG. 12, three bits of the first bit flag BF1 and the second bit flag BF2
If the fifth, sixth, and seventh are equal,
Since it is determined in step 8A, the velocity values of the third, fifth, sixth, and seventh key-on event data in the MIDI data string are increased by "1". That is, the velocity value “63” of the third key-on event data becomes “64”, the velocity value “78” of the fifth key-on event data becomes “79”, and the velocity value “6” of the sixth key-on event data becomes “79”. 91 becomes “92”, and the velocity value “42” of the seventh key-on event data becomes “43”.

Step 8D is a process which is performed when the determination in step 86 or 8A is NO or when the process in step 8C is completed.
In the case where the processing from Step 8C to Step 8C is one round processing, it is determined whether this one round processing has been performed eight times, that is, eight bits. , Otherwise (NO),
Returning to step 85, the processing of steps 85 to 8C is performed on the next one bit. In step 8E, when the processing from step 83 to step 8D is one round processing, it is determined whether the one round processing has been performed by the number of bytes constituting the scrambled decoded data,
If performed (YES), the process proceeds to the next step 8F; otherwise (NO), the process returns to the step 83, where the next 1-byte value of the scramble decode data is compared with the values in the steps 83 to 8D. Perform processing.

At step 8F, a scrambling process is performed on the latter half of the MIDI data sequence according to the scrambling content selected at step 81. For example, the scramble processing may be performed on the key-on data after the embedding of the above-described scrambled decoded data, or after the embedding of the scrambled decoded data,
The scrambling process may be performed after a predetermined number of key-on data has elapsed. Alternatively, the scramble decoding data may be embedded a plurality of times, and then the scrambling process may be performed. In this case, the retrieved M
When the IDI data is the program change event PCM, the scramble contents may be changed at random, and the embedding process of the scramble decode data and the editing process of the MIDI data string according to the scramble contents may be performed. Program change events occur relatively infrequently compared to note-on events, etc.
After the program change, it means that the instrument changes, so change the scramble content starting from that position, embed the scramble decode data, and perform scramble processing, so that certain instruments can be played without scrambling Can be performed, and the performance can be scrambled after a predetermined time has elapsed.

Next, a description will be given of a process of restoring the scrambled decoded data given by the MIDI editing process 2 in FIG. Note that the scrambling process can be canceled by performing the reverse process according to the algorithm.
Here, the description is omitted. FIG. 9 shows that the electronic musical instrument 1 has M
M as an example when operating as an IDI data restoration device
It is a flowchart figure which shows IDI data restoration processing 2. In this case, the digital signature read out from the floppy disk drive 24, the electronic signature as a part of the header information, that is, the copyright display data is dispersedly recorded in the velocity byte portion, and the scramble decode data is recorded. Shall be In the following embodiment, an operation from detection of this scrambled decoded data to restoration of MIDI data based on the detected data will be described.

First, in step 91, null data is stored in the decode data storage register DECODE. That is, the contents of the decode data storage register DECODE are reset. In step 92, the MIDI data string from which the scramble decode data is to be detected, that is, the MIDI data string to which the scramble decode data is added by the MIDI data editing of FIG. 8 is extracted. Then, in the next step 93, the values of the byte register BR and the bit counter BCN are reset.

Next, at step 94, data such as key-on event data, program change data and control change data are sequentially extracted from the MIDI data string (Standard MIDI File: SMF). In step 95, it is determined whether or not the extracted MIDI data is key-on event data KON. If it is key-on event data (YES), the flow proceeds to the next step 96; Therefore, if the MIDI data extracted in step 94 is key-on event data,
A key-on event MIDI data string SMF2 as shown in FIG. 12 (G) is created. FIG.
The key-on event data string SM shown in FIG.
It is the same as F2.

In step 96, the data of each byte in the key-on event data is stored in the corresponding register a, b, c. That is, the channel number in the key-on status byte in the key-on event data is stored in the channel register a, the key code in the next first data byte (key code byte) is stored in the key code register b, and the second data The velocity in the byte (velocity byte) is stored in the velocity register c. In step 97, the value of the byte register BR is doubled, that is, shifted, and the inverted value of the function f1 (a, b, c,) = (a + b + c) mod2 is added to the least significant bit. In step 98, the value of the bit counter BCN is incremented by one. Step 99
Then, it is determined whether or not the value of the bit counter BCN has become "8". If YES, the process proceeds to the next step 9A, and if NO, the process jumps to the step 9C.

For example, in the case of the MIDI data string SMF2 of the key-on event as shown in FIG. First, when a predetermined function f1 (a, b, c) of each key-on event data is calculated,
As shown in FIG. That is, (a + b + c)
Is "0" if the value is even and "1" if the value is odd. Then, these inverted bits are as shown in FIG.
Since the value sequentially shifts the byte register BR, one byte of scrambled decoded data is finally formed as shown in FIG. The data of FIG. 12 (J) thus obtained is the same as that of FIG. 12 (F). That is, the scrambled decoded data distributed and written in the velocity byte of the MIDI data, that is, the data as shown in FIG.
This is faithfully reproduced as in (J).

At step 9A, the value stored in the byte register BR is additionally stored in the decode data storage register DECODE. In step 9B, the values of the byte register BR and the bit counter BCN are reset. Step 9C
This is a process performed when NO is determined in step 95 or when the process of step 9B is completed. Whether the process of steps 94 to 9B is completed for 2 bytes corresponding to the scramble decode data is determined. Is determined, and the result of the determination is completed for two bytes (YE
In the case of S), the process proceeds to the next step 9D, and if not completed (NO), the process returns to the step 94 to repeatedly execute a series of processes. In step 9D, a process of restoring the scrambled MIDI data is performed based on the contents of the scramble decoded data.

In the above-described embodiment, a case has been described in which key-on event data is sequentially extracted from the MIDI data string, and scrambled decoded data is sequentially stored for the key-on event data.
Only one type of scramble processing can be performed on the IDI data string. Therefore, a third embodiment in which different scrambling processes can be performed for each channel unit will be described. FIG. 10 is a flowchart showing a MIDI data editing process 3 as an example when the electronic musical instrument 1 operates as a MIDI data editing device. First, in this case, the electronic musical instrument 1 distributively records, together with the above-described scrambled decode data, an electronic signature which is a part of header information, that is, copyright display data, in the MIDI data read from the floppy disk drive 24. .

First, in step 101, the contents of the electronic signature (copyright display data) to be distributed and written in the MIDI data string are determined, and the contents of the scramble decode data corresponding to each channel are determined. For example, "COPYRIG"
When characters such as "HT @ YMH @ 1996" are distributed and written in the MIDI data string, these character strings are determined using the panel switch 2E. Here, △ means a blank. Since the contents of the electronic signature to be written, that is, the character string and the contents of the scrambled decoded data are determined, this time, in step 32, a data string related to the electronic signature and the scrambled decoded data is obtained. For example, by using the panel switch 2E, "COPYRIGH
When "T @ YMH @ 1996" is input, it is converted to a data string of ASCII character codes. In this case, “C” = “43H”, “O” = “4FH”, “P”
= “50H”, “Y” = “59H”, “R” = “52”
H ”,“ I ”=“ 49H ”,“ G ”=“ 47H ”,
“H” = “48H”, “T” = “54H”, “△” =
"20H", "Y" = "59H", "M" = "4D
H ”,“ H ”=“ 48H ”,“ △ ”=“ 20H ”,
"1" = "31H", "9" = "39H", "9" =
A series of ASCs consisting of "39H", "6" = "36H"
The data string of II will be obtained.

The data sequence of these character codes is
Needless to say, it can be embedded in the MIDI data by the same method as the scramble decode data described in the embodiment. Therefore, in the following processing, these ASCII data strings are converted into MIDs in the same manner as the method of embedding the scrambled decoded data strings.
It is assumed that the data is dispersedly recorded in the I data string. That is, in the next step 103, the same processing as steps 83 to 8F in FIG. At this time, the arithmetic processing according to the predetermined function of step 89 is performed differently for each channel. For example, in step 89, the function f1 (a, b,
c,) = (a + b + c) mod2 is stored in the second bit flag BF2, which is used as the first function processing.
Then, in addition to the first function processing, the following second and third functions are performed.
From among the fourth and fourth function processes, an appropriate one is properly used for each channel. The second function processing is f2
(A, b, c) = (a + c) mod2, the third function processing is f3 (a, b, c) = (b + c) mod2, and the fourth function processing is f4 (a, b, c) = (C) mod2.

In step 103, the first to fourth function processes are selectively switched for each MIDI channel, and the same processes as steps 83 to 8F in FIG. 8 are performed. The digital signature data and the scramble decode data converted according to the selected function processing are added. As described above, when an edit process such as changing data of a certain channel at a time by changing the contents of the function process for each channel, for example, a change of channel information or a shift of a key code is performed. However, the electronic signature data and the scrambled decoded data can be restored from the data of another channel using a function not related to the data of the specific channel changed by the editing.

Next, the MIDI data editing process 3 shown in FIG.
MIDI that restores MIDI data edited by
The data restoration process 3 will be described with reference to FIG. FIG. 11 is a flowchart illustrating a MIDI data restoration process 3 which is an example of a case where the electronic musical instrument 1 operates as a MIDI data restoration device. In this case, a predetermined function processing (any of the above-described first to fourth function processing) is performed for each channel of the MIDI data read from the floppy disk drive 24, so that the header information is included in the velocity byte portion. It is assumed that the electronic signature (copyright display data) and the scrambled decode data, which are parts, are dispersedly recorded. Therefore, in the following embodiment, distributedly displayed copyright display data is detected by a predetermined function process for each channel, and the detected copyright display data is displayed on a monitor or the like.
A case where an operation of restoring IDI data is performed will be described.

First, in step 111, a MIDI data string from which an electronic signature is to be detected, that is, a MIDI data string shown in FIG.
In a data editing process 3, a MIDI data string to which digital signature data and scramble decoding data are added is extracted for each channel according to a predetermined function process. Then, in the next step 112, the channel counter is reset, and in step 113, the function counter is reset. The channel counter and the function counter are used for performing each function processing on each channel in the subsequent processing. For example, if the MIDI channel is 1
In the case of 6 channels, the channel counter is set to 0
To 15 are cyclically counted. The function counter indicates that the function processing is 4 as described above.
In the case of the type, the processing is performed so as to cyclically count from 0 to 3. When the function counter is “0”, the first function processing f1 (a, b, c,) = (a + b + c) mod
2 and “1”, the second function processing f2 (a, b,
c) = (a + c) mod2, and in the case of “2”, the third function processing f3 (a, b, c) = (b + c) mod2,
In the case of "3", the fourth function processing f4 (a, b, c) =
(C) means mod2.

In step 114, for the channel corresponding to the value of the channel counter, the digital signature data and the scrambled decoded data are processed in the same manner as in steps 91 to 9C in FIG. 9 using the function processing corresponding to the value of the function counter. Perform detection processing. Step 11
At 5, it is determined whether or not the detected digital signature data sequence has a significant portion. The significant part here is AS
"COPYRI" composed of CII character data
GHT "is part of the signature data. Therefore, in step 115, "COPY" is included in the character string composed of ASCII character data sequentially added to the decode data storage register DECODE by the processing of FIG.
RIGHT ”is determined. If it is determined in step 115 that there is no significant part in the decoded data storage register DECODE (NO), the process proceeds to the next step 116, where the function counter is incremented by one. Then, in the next step 117, it is determined whether or not the processing of steps 114 and 115, that is, the extraction processing of the signature data and the scrambled decoded data, has been performed for all the function processings.
In the case of S), proceed to the next step 118, otherwise (NO), return to step 114, and perform the processing of steps 114 and 115 for the next function processing. Conversely, if the result of determination in step 115 is that there is a significant portion in the decoded data storage register DECODE, processing proceeds to step 119, where MIDI data is restored based on the contents of the scrambled decoded data. That is, the determination in step 115 is YES
Since it can be determined that the detected scrambled decoded data is also significant, the original MIDI data is restored based on the scrambled decoded data. Needless to say, the detected digital signature data may be displayed on a monitor.

The determination of YES in step 117 means that the extraction processing of the electronic signature data and the scrambled decoded data for all the MIDI channels using all the function processing results in a significant data string. Since the part did not exist, step 11
In step 8, characters such as "failure in detecting digital signature data and scrambled decoded data" are displayed on the monitor. In step 11A, the channel counter is incremented by one. And the next step 1
In 1B, it is determined whether or not the processing of steps 114 and 115, that is, the processing of extracting the digital signature data and the scrambled decoded data has been performed for all the channels. If the processing has been performed (YES), the processing is terminated. If not (NO), the process returns to step 113, and the next MIDI channel is returned to step 113.
To 115 are performed.

In the above-described embodiment, the case where signature data and scramble decode data are dispersedly recorded in the velocity portion of MIDI data has been described. However, this is merely an example, and other author names and titles of songs are used. Needless to say, character data relating to the title of an image / video, data relating to the data format, and other various data may be distributedly recorded. In addition, distributed recording may be performed on duration time (waiting time) data other than the velocity portion, or distributed recording may be performed on both of them. In the case of performing the distributed recording on both, the location of the distributed recording may be appropriately switched according to the strictness, that is, the degree of the content of the data being changed by the distributed recording. In other words, if the recording is distributed to the duration time data in an area where the duration time data is short, the rate of change (strictness) due to the recording becomes large, which is not preferable. Therefore, even if the recording is performed in a distributed manner, the influence is small. Similarly, even in the case of recording in the velocity portion, if the area where the velocity value is small is dispersedly recorded in the velocity portion, the rate of change (strictness) due to the recording becomes large, so it is not preferable. Then, even if the recording is dispersed, the influence is small. Therefore, various data may be dispersedly recorded at a velocity greater than the predetermined value by appropriately considering these.

Further, in the above-described embodiment, the case where the recording is distributed to the MIDI data has been described. However, other waveform data, sequence data, digital recording audio data, image data, moving image data, registration (for an electronic musical instrument) may be used. (Setting recording) data and the like may be dispersedly recorded. In the case of distributive recording on waveform data, the waveform data (wave_dat) is used as a predetermined function process.
a) modulo 2 of itself, that is, f1 (wave
_Data) = wave_data mod2. Further, using the value of the waveform data and its point data, the modulo 2 of the sum of the two data, that is, f2
(Wave_data, sample_point) =
(Wave_data + sample_point)
It may be mod2. In the embodiment of FIG. 10 and FIG. 11, the case of detecting the signature data by changing the type of function processing for each (logical) channel has been described.
The type of function processing may be changed for each detection timing of program change data. In this case,
The process of determining whether a significant portion exists in the detected data string also needs to be performed at each program change data detection timing.

In the above-described embodiment, the case where the detected digital signature data is displayed on the monitor has been described. However, if the digital signature data does not exist or the digital signature data cannot be completely recovered on the detecting side ( In each logical channel, when a channel in which digital signature data can be detected and a channel in which digital signature data cannot be detected are mixed),
The reproduction of the data may be stopped. If the electronic musical instrument or computer on the detecting side is connected to a network, the host computer sends a message indicating that illegally edited data exists on the network, and the host computer can detect it. You may be able to. In the above embodiment, the electronic musical instrument has the MID
Although the case of operating as an I data editing device or a MIDI data restoration device has been described, hardware for performing the same processing may be separately configured, or may be configured by software, a DSP, a microprogram, or the like. Good. In addition, such a MIDI data editing device or a MIDI data restoration device is built in a floppy (registered trademark) disk drive or a communication interface in advance, and electronic signature data is forcibly added at a data input / output stage. Or may be detected.

In the above-described embodiment, the case where digital signature data and scrambled decode data are added has been described. However, data to which digital signature data and scrambled decode data have been added is supplied on a floppy disk, a compact disk, or the like. Alternatively, a data format that is supplied electronically through a network may be adopted. In step 8B of FIG. 8, the case where the velocity data value is incremented by 1 has been described. However, the decrement processing may be performed, or these processing may be alternately performed at an appropriate timing (for example, every predetermined number of data). It may be. In the above embodiment, the case where the bit inversion processing is performed after the predetermined function processing has been described, but this need not be performed. In addition to the bit inversion processing, the upper bits and lower bits are exchanged,
To perform logical operation processing such as AND, OR, XOR,
It goes without saying that various processes may be added. Further, an appropriate encryption process may be performed. For example, the results of the first to fourth function processes described above may be combined as appropriate, or the result of the previous function process may be combined with the next function process for calculation. Note that it goes without saying that other methods may be used as long as each of these processes can be performed at a high speed to some extent and can be returned to the original state by the inverse conversion after the conversion.

In the above-described embodiment, a case has been described in which digital signature data and scrambled decode data are newly added at each detection timing of program change data. However, the present invention is not limited to this. And so on) at each data detection timing. Further, in the case of performing distributed recording on waveform data, a process of adding new signature data may be performed for each predetermined number of samples or for each predetermined zero cross. This is because the zero crossing (timing at which the sign of the waveform value changes) is considered as a reference point in waveform editing. Further, in the above-described embodiment, a case has been described where auxiliary information such as digital signature data and a title is recorded.
MID when recording data and waveform data together
A part of the waveform data may be recorded in the I data, or a part of the MIDI data may be recorded together with the waveform data.

In the above-described embodiment, a case has been described in which signature data is dispersedly recorded in the velocity portion of MIDI data. However, this is merely an example, and other author names, song titles (song titles), Text information on the title of the image / video, information on its data format, and various other electronic information (commentary, song information, author year, lyrics, news, hardware ID (model name, OS used), etc. It is needless to say that the various types of information described above may be dispersedly recorded. In this case, the electronic signature in each of the processes shown in FIGS. 8 to 11 may be replaced with such various types of electronic information. The electronic information processed in this manner may be displayed on a monitor screen. At this time, the attached information may be detected as a series of integrated file information, or may be recognized as a flow of electronic information detected from MIDI data during an automatic performance, and displayed on a screen in real time. Is also good. In this case, if the attached information is image information, an image is drawn in real time by MIDI data, and if it is text information, real-time information display such as news distribution can be performed. Become. In addition, since the technology for adding information is simple, electronic information can be embedded on demand or the like, so that real-time drawing such as TV broadcasting can be performed. Also,
It can also be used to distribute IDs and passwords for the Internet and e-mail.

In the first embodiment, that is, in the MIDI data editing process 1 shown in FIG. 3, in step 38, the previous value register b0 storing the key code of the previous key-on event data and the current key-on event data are stored. Of the key code register b storing the key code of
The difference between the previous value register c0 storing the velocity of the previous key-on event data and the velocity register c storing the velocity of the current key-on event data is stored in the key and stored in the velocity difference value register dvel. Stored. In that connection,
New key code value b1 and velocity value c converted by the processing from step 3A to step 3G
1 will always have a close relationship with the key code and velocity in the previous key-on event. Also in the MIDI data restoration process 1 of FIG. 4, the value of the restoration key code register b2 is determined based on the previous value register b0 and the key code register b, and the value of the restoration velocity register c2 is determined based on the previous value register c0 and the velocity register c. Finding the value.

Therefore, if the event data (key code or velocity value) of the MIDI data is modified after the MIDI data editing processing shown in FIG. It happens that everything is different from the data. This is excellent in that if the data is tampered, all subsequent data can be invalidated, but if an error occurs in the event data in the middle and the key code or velocity changes, the There is a problem that data cannot be effectively restored.

Therefore, the MIDI data editing process 1 shown in FIG.
And the MIDI data restoration process 1 of FIG.
By making changes as in the I data editing process 4 and the MIDI data restoring process 4 in FIG. 14, even if the event data changes due to being rewritten in the middle, the subsequent data can be effectively restored. I did it. In the MIDI data editing process 4 of FIG. 13, the same components as those of the MIDI data editing process 1 of FIG. MID of FIG.
The I data editing process 4 is the MIDI data editing process 1 in FIG.
3 in that the processing of step 39 in FIG. 3 is omitted,
The point is that the previous value registers b0 and c0 in step 38 are changed to the leading value registers bH and cH as in step 138. In step 138, the leading value register bH storing the key code of the leading key-on event data
And a key code register b storing the key code of the current key-on event data, storing the difference in a key code difference value register dkey, and storing a velocity of the first key-on event data in a head value register. The difference between cH and the velocity register c storing the velocity of the current key-on event data is obtained, and the difference is stored in the velocity difference value register dvel. Then, the key code difference value register dke
new key code b1 and velocity c1 based on the stored value of y and the stored value of velocity difference value register dvel
Is calculated.

In the MIDI data restoring process 4 of FIG. 14, the same components as those of the MIDI data restoring process 1 of FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted. FIG.
The MIDI data restoration process 4 of FIG. 4 differs from the MIDI data restoration process 1 of FIG. 4 in that the process of step 48 of FIG. 4 is omitted, and the previous value registers b0 and c0 of step 45 and step 46 are replaced with those of steps 145 and 146. This is the point that the start value registers bH and cH are changed as described above. That is, in step 145, the head value register bH
The value of the repair key code register b2 is calculated based on the values of the key code register b and the key code register b. In step 146, the value of the repair velocity register c2 is calculated based on the values of the head value register cH and the velocity register c. FIG.
And the MIDI data is edited based on the value of the first event data by making the change as shown in FIG.
Since the event data will be restored, even if the event data in the middle is rewritten or changed due to the occurrence of an error etc., it will not be impossible to restore the subsequent data, and the event data after the error has occurred It can be completely repaired. In the above description, the MI is determined based on the value of the first event data.
Although the case of editing the DI data has been described, an arbitrary value may be written in the header in advance, and the MIDI data may be edited or restored based on the value. Further, the value of the event data serving as the reference may be taken from an arbitrary event (for example, the first event in one bar).

The MIDI data editing process 1 of FIG. 3 and FIG.
In the MIDI data editing process 3 of 3, the contents of the key code and velocity of the key-on data are rewritten from the beginning of the MIDI data. The resulting musical sounds are completely irrelevant, and it is not possible to listen to only a part of them. Therefore, as a modification of FIG.
As in the data editing process 5, steps 3B and 3
Step 3J for determining editing conditions is inserted between C and C.
MIDI data is scrambled when specific editing conditions are met. Note that, similarly to FIG. 15, in the case of FIG. 13, step 3J may be inserted between step 3B and step 3C.

For example, as the editing conditions in step 3J,
It is set so as to determine whether or not a predetermined time (for example, a time such as 30 seconds) has elapsed from the start of playing the MIDI data. As a result, the scramble processing is not performed on the first part of the MIDI data, and
The DI data is reproduced by normal MIDI data reproduction processing. On the other hand, the MIDI
Even if the data is to be reproduced by the normal MIDI data reproduction process, only the melody tone is reproduced because the scramble processing is performed on the portion. As a result, the first part of the MIDI data can be MIDI data that can be reproduced by normal MIDI data reproduction processing, and the remaining part can be MIDI data that cannot be reproduced. The editing conditions can be set arbitrarily from the outside, and it goes without saying that various conditions other than the time may be appropriately combined and applied. For example, it goes without saying that conditions such as a case where the sound is not sounded for a predetermined time or more, a case where a predetermined number of bar line data are generated, may be applied alone, or these conditions may be variously combined.

[0095]

According to the present invention, desired additional information can be added without changing the data format of main information composed of a plurality of event data such as music data, and consequently these data can be added. An encryption process is performed, and there is an effect that the main information and the attached information cannot be reproduced and used unless the encryption is decrypted. Further, the operation and effects as described above are achieved.

[Brief description of the drawings]

FIG. 1 shows an MI of an electronic information processing system according to the invention.
FIG. 7 is a diagram showing a specific example of how data is converted according to DI data editing processing 1 and MIDI data restoration processing 1.

FIG. 2 is a block diagram showing an overall configuration of an electronic musical instrument that operates as an electronic information processing system according to the present invention.

FIG. 3 is a flowchart illustrating an example of MIDI data editing processing 1 when the electronic musical instrument of FIG. 2 operates as an electronic information processing system.

4 is a flowchart illustrating an example of a MIDI data restoration process 1 when the electronic musical instrument of FIG. 2 operates as an electronic information processing system.

FIG. 5 is a concept showing the relationship between auxiliary information, key code, and velocity when a rectangular coordinate system is configured such that a key code is assigned to a vertical axis, a velocity is assigned to a horizontal axis, and an intermediate point between values is an origin. FIG.

FIG. 6 is a diagram showing a detailed relationship between the accessory information of FIG. 5 and key codes and velocities.

FIG. 7 is a diagram showing an example of the content of scramble decode data embedded in MIDI data.

FIG. 8 is a flowchart showing another example of the MIDI data editing process 2 when the electronic musical instrument operates as an electronic information processing system.

FIG. 9 is a flowchart showing another example of the MIDI data restoration process 2 when the electronic musical instrument operates as an electronic information processing system.

FIG. 10 shows another example of the MIDI data editing process 3 when the electronic musical instrument operates as an electronic information processing system.
It is a flowchart figure which shows.

FIG. 11 shows another example of the MIDI data restoration process 3 when the electronic musical instrument operates as an electronic information processing system.
It is a flowchart figure which shows.

FIG. 12 shows an M of the electronic information processing system according to the present invention.
IDI data editing processing 2 and MIDI data restoration processing 2
Is a diagram showing a specific example of how data is converted according to the following.

FIG. 13 shows another example of the MIDI data editing process 4 when the electronic musical instrument operates as an electronic information processing system.
It is a flowchart figure which shows.

FIG. 14 shows another example of the MIDI data restoration process 4 when the electronic musical instrument operates as an electronic information processing system.
It is a flowchart figure which shows.

FIG. 15 shows another example of MIDI data editing processing 5 when the electronic musical instrument operates as an electronic information processing system.
It is a flowchart figure which shows.

[Explanation of symbols]

21 CPU, 22 ROM, 23 RAM, 24 floppy disk drive, 25 hard disk drive, 26 CD-ROM drive, 27 communication interface, 28 communication network, 29 server computer, 2A MIDI interface, 2B ...
Other MIDI devices, 2C: keyboard, 2D: key press detection circuit,
2E: panel switch, 2F: switch detection circuit, 2G
... Display, 2H ... Display circuit, 2J ... Sound source circuit, 2
K: effect circuit, 2L: sound system, 2M: data and address bus, 2N: timer, 2R: ribbon controller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference)

Claims (9)

[Claims] 1. A first system comprising a plurality of event data.
Inputting the information of the event data; classifying the event data into two or more groups; inputting the second information representing a method of changing the information; and contents of the event data included in one of the groups. Is changed based on the second information, and the content of the event data included in another group different from the one group is changed based on the second information by using a changing method different from this changing method. By changing the first
And disposing the second information in a distributed manner. 2. A first system comprising a plurality of event data.
Inputting the information, and classifying the event data into two or more groups; and information indicating a method of changing the information, wherein the second information and the third information each indicating a different change method. Inputting, changing the content of the event data included in at least one group of the classified event data based on the second information, and changing the content of the event data included in another group different from the one group Changing the content of the event data based on the third information, thereby distributing and arranging the second information and the third information in the first information. 3. A first system comprising a plurality of event data.
Inputting the information of the event data; classifying the event data into two or more groups; detecting second information representing an information change method from the event data included in one of the groups; By detecting the second information from the event data included in another group different from the group by another detection method different from the method, the second information is distributed and arranged for each group. Detecting the second information from the first information by a different detection method for each group. 4. A first system comprising a plurality of event data.
Entering the event data into two or more groups; detecting second information representing an information change method from the event data included in one of the groups; Change the event data of the group based on the information,
Detecting third information indicating an information change method different from the second information from event data included in another group different from the group, and detecting event data of the other group based on the third information; Is changed, the second information and the third information indicating different information changing methods are changed.
Information is distributed in different groups
Detecting the second information and the third information from the information and decoding the event data of each group according to the information. 5. A machine-readable storage medium storing a program for causing a computer to execute the method according to claim 1. 6. A first system comprising a plurality of event data.
Means for inputting information of the following; means for classifying the event data into two or more groups; means for inputting second information indicating a method of changing information; contents of event data included in one of the groups Is changed based on the second information, and the content of the event data included in another group different from the one group is changed based on the second information by using a changing method different from this changing method. By changing the first
Means for distributing and arranging said second information in said information. 7. A first system comprising a plurality of event data.
Means for inputting the following information; means for classifying the event data into two or more groups; and information representing a method of changing information, wherein the second information and the third information each representing a different change method. Means for inputting, the content of the event data included in at least one group of the classified event data is changed based on the second information, and the content of the event data is included in another group different from the one group An electronic information processing apparatus including means for distributing the second information and the third information in the first information by changing the content of the event data based on the third information . 8. A first system comprising a plurality of event data.
Means for inputting information of the following; means for classifying the event data into two or more groups; detecting second information indicating an information change method from event data included in one of the groups; By detecting the second information from the event data included in another group different from the group by another detection method different from the method, the second information is distributed and arranged for each group. Means for detecting the second information from the first information by a different detection method for each group. 9. A first system comprising a plurality of event data.
Means for inputting information of the following; means for classifying the event data into two or more groups; detecting second information indicating an information change method from the event data included in one of the groups; Change the event data of the group based on the information,
Detecting third information indicating an information change method different from the second information from event data included in another group different from the group, and detecting event data of the other group based on the third information; Is changed, the second information and the third information indicating different information changing methods are changed.
Information is distributed in different groups
Means for detecting the second information and the third information from the information and decoding the event data of each group according to the information.