JP2004157350A - Performance information processing method, performance information processor, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the load in a small-sized electronic device by solving the problems that the sound source built in the small-sized electronic device is sometimes little in the number of sound productions (the number of channels), and extraordinary loading is liable to act on the device in reproducing such contents which exceed the number of sound productions if an SMF (Standard MIDI File) is subjected to a DVA (Dynamic Voice Allocation). <P>SOLUTION: The performance information processing method has a process (SP100) of setting the number of sound productions for setting the maximum number of sound productions of the electronic device for reproducing the performance information constituted by a plurality of events, a process (ST130) of detecting truncate events for detecting the truncate events to be truncated from the events in compliance with the prescribed rule when the number of the events relating to the musical tones produced at the same time exceeds the maximum number of sound productions, and conversion processes (SP135 and SP140) of converting the performance information according the the truncate events in such a manner that the number of the musical tones produced at the same time attains the maximum number of sound productions or below. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a performance information processing method, a performance information processing apparatus, and a program suitable for use in a small electronic device.
[0002]
[Prior art]
A small electronic device such as a mobile phone or a portable information tool has a simple sound source built therein, and generates musical tones such as ringtones and sound effects.
On the other hand, a standard MIDI format (SMF) is known as a standard format for obtaining compatibility of performance data between different sequencers and sequence software and mutually using data. Note that content (for example, performance information) is generally produced using a dedicated authoring tool (editing tool), and a certain limit can be imposed on the content. Further, Patent Document 1 discloses a method in which when a new note-on is input, the same or similar sound is detected and processed from note events being sounded.
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. 11-237879
[0004]
[Problems to be solved by the invention]
However, a sound source built in a small electronic device may have a small maximum number of pronunciations (the number of channels), and a content that exceeds the number of pronunciations when DVA (dynamic Voice Allocation) is performed on the SMF inside the small electronic device. When reproducing is performed, a very large load is applied, and problems such as delay in sound reproduction, so-called fuzziness, and interruption of reproduction are likely to occur. Here, the DVA refers to a function of dynamically securing in advance the sounding priority of each part and the number of sounds to be emitted by the main part in advance so as to prevent sound interruption when the maximum number of sounds of the sound source is exceeded. Further, in a mobile phone, there is also a restriction that a processing load that can be spent for tone synthesis is limited to about 10% of the CPU power. Further, even if the number of sounds is reduced in the method of Patent Document 1, the number of simultaneous sounds of the sound source may be exceeded.
The present invention has been made in view of the above circumstances, and has as its object to provide a performance information processing method, a performance information processing apparatus, and a program that can reduce the load on a small electronic device.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by having the following configuration. The contents in parentheses are examples.
The performance information processing method according to claim 1, wherein performance information (SMF file) having a plurality of events reproduced by a sound source built in an electronic device (mobile phone, portable information terminal) is converted. If the number of simultaneously pronounced events exceeds a predetermined maximum number of pronunciations, a truncation event detection step of detecting a truncation event to be truncated from the event according to a predetermined priority rule, and Converting the performance information according to the truncation event so that the number is less than or equal to a number.
Further, the performance information processing method according to the second aspect is characterized in that the method further comprises a maximum number of sounds setting step for setting the maximum number of sounds.
Further, the performance information processing method according to claim 3 includes a priority rule selecting step of selecting the priority rule from a plurality of different priority methods.
In the performance information processing method according to the fourth aspect, the truncated event detecting step may include, when the number of events related to the simultaneously-produced musical tones exceeds the maximum number of sounds, sets the oldest event as a truncated event. The converting step is a step of correcting the performance information (DURATION in the SMF file) so as to shorten the last part of the sounding period related to the truncation event.
Further, in the performance information processing method according to the fifth aspect, a note-off event corresponding to the truncated event is newly inserted when the number of events related to the simultaneously generated musical sounds exceeds the maximum number of sounds. In addition, the last part is shortened by deleting the original note-off event.
In the performance information processing method according to claim 6, in the truncation event detecting step, when there is substantially no time difference between note-on and note-off, both of these events are detected as the truncated event. Wherein the converting step is a step of deleting the truncation event.
According to a seventh aspect of the present invention, there is provided a performance information processing apparatus for executing the performance information processing method according to any one of the first to sixth aspects.
Further, the performance information processing apparatus according to the present invention is configured to execute the performance information processing method according to the first aspect before outputting the performance information to an electronic device that emits sound. It is characterized by.
According to a ninth aspect of the present invention, there is provided a program for executing the performance information processing method according to any one of the first to sixth aspects.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
1. Configuration of the embodiment
A configuration of a performance information processing apparatus according to an embodiment of the present invention will be described with reference to FIG.
Reference numeral 10 denotes a liquid crystal display panel on which a screen for setting conditions such as the maximum number of sounds is displayed. Reference numeral 20 denotes an I / O control unit, which includes a pointing device, a USB interface, a MIDI interface, and a dedicated cable for a mobile phone. Here, the USB interface is used for an interface with a portable information terminal and an interface with a musical sound device. Reference numeral 30 denotes an FDD unit which reads / writes a flexible disk for exchanging SMF files. Reference numeral 40 denotes an HDD unit for storing performance information before and after processing. Reference numeral 50 denotes a CPU, which controls each unit. A ROM 60 stores programs and parameters. A RAM 70 is used as a work area and a buffer. Reference numeral 90 denotes a bus line, which connects each unit. The performance information processing apparatus 100 of the present embodiment is configured by the above components.
[0007]
2. Operation of the embodiment
(1) Structure of SMF file
In the SMF file, occurrence time information is added to information such as sound generation start (note-on event) and sound generation stop (note-off event) in the MIDI information. FIG. 2C shows data notation in each event of the SMF. The beginning is DURATION data, which indicates the time from the start time of the previous event to the start time of the next event. In the next set of data, status, note number, and velocity data are set. Here, the status is “9n” for a note-on message and “8n” for a note-off message, where n is a channel number. The note number represents a pitch, and the velocity represents a volume.
[0008]
(2) When the sound of five channels is produced simultaneously and the sound is silenced after a predetermined time
The long side (horizontal direction) of the rectangle in FIG. 2B represents the length of the sound. Therefore, FIG. 2B shows the contents of the input data in the case where the sounds of the five channels are generated simultaneously and the sounds are simultaneously silenced after a predetermined time. In this case, the SMF data includes five types of combinations of DURATION “0” data and note-on event data from the 0th channel to the 4th channel. Arbitrary DURATION data corresponding to these sounding times is provided, followed by note-off event data of channel 0, and further, for other channels, data of DURATION "0" and note-off event data. Four types of combinations are provided. In this case, if the maximum number of pronunciations of the electronic device using the SMF file is four, note-on of channel 4 cannot be performed, and note-on of channel 0 must be immediately turned off. As a result, the sounds of the first to fourth channels are generated without the sound of the zeroth channel being generated. In such a case, it is desirable to delete the note-on event data and note-off event data of channel 0 in advance in order to reduce the operating time of the CPU in the electronic device. Thus, in the present embodiment, such event deletion (truncation processing) is performed.
[0009]
For the sound generation state shown in FIG. 2B, specifically, an SMF file as shown in FIG. 3A is formed. The first data is DURATION "0" data. The second data is the note-on event data of channel 0, which represents note number “60” and velocity “7F”. The third data is DURATION "0" data. The fourth data is the note-on event data of the first channel, and represents note number “50” and velocity “7F”. The same applies to the fifth to tenth data, except that the eleventh data is a DURATION “10” data, the twelfth data is a note number “60”, a velocity “7F”, and a note-off event of channel 0. Data. Further, the thirteenth DURATION data, note-off data of the first channel, and the like follow.
[0010]
Hereinafter, details of the above-described truncation processing will be described.
First, when a predetermined operation is performed in the performance information processing apparatus 100, the data of the unprocessed SMF file stored in the HDD unit 40 is read, and a predetermined process is performed in a work area of the RAM 70. Then, the SMF file is stored again in the HDD unit 40 after the processing.
When the routine of FIG. 5 is started, in step SP100, the screen shown in FIG. 4 is displayed on the liquid crystal display panel 10, and the priority mode is confirmed, the maximum number of sounds “4” is checked, and (maximum number of sounds +1) A minute buffer is reserved. Although details will be described later, when a note-on event occurs, the event is written to the buffer, and when a note-off event occurs, the corresponding note-on event is deleted from the buffer. As a result, the buffer stores data representing the tone being generated at each timing. As for the confirmation of the priority mode, selection of the last arrival priority method, the first arrival priority method, and the drum priority method is performed by setting the pointing device. Then, the process proceeds to step SP105.
[0011]
Here, the late arrival priority method refers to a method of giving priority to the data transferred later and stopping the sounding of old data. Specifically, in the case of FIG. 2A, if the maximum number of sounds is four, the sound of the zeroth channel is forcibly stopped at the point a when the event data of the fourth channel is transferred. Refers to the method. On the other hand, the first-come-first-served method is a method in which the event of the fourth channel is not generated. The drum priority method is a method in which event data specifying a drum timbre is transferred, so that events of other timbres are turned off. In confirmation of the number of sounds, the number of simultaneous sounds of the applicable electronic device is set. Here, the maximum number of pronunciations of the current sound source is 16, 32, 64, or the like, but for simplicity of description, “4” will be described below as the maximum number of pronunciations.
[0012]
In step SP105, the first data of the event data or the DURATION data of the SMF file which has not been read yet is read. Therefore, at the time of the first execution, the first SMF data is read. Then, the process proceeds to step SP110. In step SP110, the type of data is determined. Specifically, it is determined whether the data is DURATION data, note-on event data, or note-off event data. Here, since the first data is data of DURATION "0", the process proceeds to step SP112, and the DURATION data is written in the work area. Then, the process returns to step SP105.
[0013]
Then, the second SMF data is read. Since the second data is the note-on event data of the 0th channel, the process proceeds to step SP116 via step SP110. In step SP116, the note-on event data is written to the work area and further stored in the buffer. The order of the data written in the buffer is stored in the memory, and the oldest written data is recognized. Then, the process proceeds to step SP120. In step SP120, it is determined whether or not the number of sounds to be simultaneously generated exceeds the maximum number of sounds. At this time, the number of note-on event data in the buffer is “1” and does not exceed the maximum number of sounds “4”, so it is determined to be “NO” and the process proceeds to step SP145. In step SP145, it is determined whether the transfer of the SMF data has been completed. Since the transfer has not been completed, "NO" is determined, and the process returns to step SP105.
[0014]
Similarly, the DURATION data and the note-on event of the first channel, the second channel, and the third channel are written in the work area, and further stored in the buffer. Then, the DURATION data of the fourth channel is written to the work area, and the process returns to step SP105.
[0015]
Next, since the tenth data is the fourth channel note-on event data, the process proceeds to step SP116 via steps SP105 and SP110, where the note-on event data is written to the work area and further stored in the buffer. (FIG. 3B). Here, FIG. 3B shows the state of the buffer. Then, in step SP120, it is determined whether or not the number of sounds to be simultaneously generated exceeds the maximum number of sounds. At this point, since the number of note-on event data in the buffer is five, which exceeds the maximum number of sounds “4”, “YES” is determined, and the process proceeds to step SP130.
[0016]
In step SP130, an event to be truncated is determined. Here, truncation refers to adding / deleting data in order to reduce the number of simultaneous sounds to the maximum number of sounds or less, deleting unnecessary data, or changing or shortening the DURATION at the stage of editing the SMF data. is there. Specifically, when the number of simultaneously sounded events exceeds the maximum number of sounds, the oldest event is a truncated event in the last-arrived priority system, and the newest event is a truncated event in the first-arrived priority system. In addition, both events where there is little time between note-on and note-off are defined as truncation events. In the case of FIG. 2B, the event to be truncated is determined to be the oldest event, the note-on event of channel 0, and the process proceeds to step SP135.
[0017]
In step SP135, in order to delete the event data determined in step SP130, note-off data creation or DURATION change processing is performed in the work area. In this case, when the event data of the fourth channel is transferred, note-off event data is inserted in order to shorten the sound generation of the zeroth channel in the last-arrived priority system. That is, the processing is performed so that the number of musical tones that are simultaneously generated is equal to or less than the maximum number of tones. Specifically, data of DURATION “0”, note number “60”, velocity “7F”, and note-off event data of channel 0 are added to the work area (see FIG. 3C). Here, FIGS. 3C to 3E show the data structure in the work area in time series. Then, the process proceeds to step SP140.
[0018]
In step SP140, useless data is deleted, and data is organized. Specifically, when there is substantially no time difference between the note-on and the note-off, these events are deleted, and the buffer is further organized. That is, the note-on event data of channel 0 is deleted from the buffer. Further, the note-on event data of channel 0, the added note-off event data, and the DURATION data having a value of "0" provided before them are deleted in the work area (FIG. 3D). Then, the process proceeds to step SP145. In step SP145, since the transfer has not been completed, "NO" is determined, and the process returns to step SP105.
[0019]
Similarly, since the eleventh data is DURATION "10" data, the DURATION data is written to the work area in step SP112 (FIG. 3D). Next, since the twelfth data is the note-off event data of the 0th channel, the process proceeds to step SP114. In step SP114, the note-off event data is written in the work area, and the corresponding note-on event data in the buffer is deleted. However, when there is no corresponding note-on event data in the buffer, writing to the work area is not performed. At the time of this execution, since the note-on event data of the corresponding channel 0 has been deleted from the buffer, the note-off event data is not written to the work area (FIG. 3D). Then, in step SP145, since the transfer of the SMF data has not been completed, "NO" is determined, and the process returns to step SP105.
[0020]
Next, since the thirteenth SMF data is DURATION "0" data, the DURATION data is written to the work area via step SP112 (FIG. 3D). Here, if the thirteenth DURATION data is written as it is, the eleventh DURATION data and the thirteenth DURATION data are arranged adjacently. Since a plurality of DURATION data are adjacent to each other as described above, the data amount is meaninglessly increased. Therefore, these DURATION data are combined into one DURATION data. That is, the value of the eleventh DURATION data stored in the work area is added to the value of the DURATION data that is the thirteenth data. Then, DURATION data, which is the thirteenth data, is written to the work area. At this time, the DURATION data which is the eleventh data is deleted.
[0021]
Further, since the 14th SMF data is a note-off event of the first channel, the process proceeds to step SP114. In this case, since the note-on event data of the first channel corresponding to the note-off event has been written in the buffer, the note-off event data is written in the work area (FIG. 3D). Is deleted from the first channel.
[0022]
Similarly, the 15th and subsequent data are processed, and the performance information (SMF file) shown in FIG. 3E is generated in the work area. Then, after the generated SMF file is temporarily stored in the HDD unit 40, it is input to the electronic device via the I / O control unit or stored in the flexible disk.
[0023]
(3) When the sounding start time differs for each sounding channel
FIG. 2A shows the contents of input data in which the five channels from the 0th channel to the 4th channel start to emit sound in order, and after the sound is emitted for a certain time, the sound is sequentially turned off. Also when reproducing the input data, only four channels of the electronic device are prepared, so that five channels cannot be generated simultaneously. If the late arrival priority method is adopted, when the note-on data of the fourth channel is transferred, the oldest note-off timing of the zeroth channel is forcibly changed from the point b to the point a, and the sounding time is shortened. You.
[0024]
In this case, the input SMF file has DURATION “0” data as the first data, and note-on event data of channel 0 as the second data. Next, as the third data, DURATION data for a certain period of time (that is, the time from the sounding of the first channel to the sounding of the second channel) is sent, and as the fourth data, the note-on event of the first channel Is provided. Similarly, DURATION data and note-on event data for a predetermined time are provided for the second, third, and fourth channels. Further, DURATION data for a certain period of time (that is, a time from the sounding of the fourth channel to the silencing of the zeroth channel) is provided as eleventh data, and the note-off data of the zeroth channel is provided as twelfth data. Can be Similarly, DURATION data and note-off event data for a predetermined time are provided for the first, second, third, and fourth channels.
[0025]
When a predetermined operation is performed in the performance information processing apparatus 100, the routine of FIG. 5 is started. In step SP100, confirmation of the late arrival priority mode, confirmation of the maximum number of sounds "4", and reservation of (maximum number of sounds +1) buffers are performed, and the process proceeds to step SP105.
[0026]
At the first execution, the first SMF data is read via steps SP105 and SP110, and the type of data is determined. Since the first data is DURATION "0" data, the DURATION data is written in the work area. Further, since the second data is the note-on event data of the 0th channel, in step SP116, the note-on event data is written to the work area and further written to the buffer. Then, in steps SP120 and SP145, “NO” is determined, and the process returns to step SP105.
[0027]
Similarly, note-on events of the first channel, the second channel, and the third channel are written to the work area and further written to the buffer. Further, DURATION data is written to the work area, and the process returns to step SP105.
[0028]
At the next execution, the tenth data is the note-on event data of the fourth channel, so in step SP116, the note-on event data is written to the work area and further written to the buffer. Then, in step SP120, since the note-on event data in the buffer is "5" and exceeds the maximum number of sounds "4", "YES" is determined. Next, when the process proceeds to step SP130, the event to be truncated is determined to be the oldest event of the 0th channel.
[0029]
Then, in step SP135, note-off event data for the 0th channel is created in the work area. That is, the note-off event data is added after DURATION data (time T from note-on of the third channel to note-on of the fourth channel (see FIG. 2A)) that is ninth data. Therefore, the note-off timing in the 0th channel is shifted by time T. Further, DURATION data having a value “0” is provided before the note-on event of the fourth channel, that is, after the newly added note-off event data of the zeroth channel. Then, in step SP140, the data for the 0th channel in the buffer is deleted. Then, the processing returns to step SP105 via step SP145.
[0030]
At the next execution, the eleventh data is DURATION data for a predetermined time, so that the DURATION data is written to the work area. Next, the twelfth data is the note-off event data of the 0th channel, but since there is no corresponding note-on event data in the buffer, the note-off event data is not written to the work area in step SP114. .
[0031]
At the next execution, DURATION data, which is the thirteenth data, is written to the work area. In this case, the value of the eleventh DURATION data stored in the work area is added to the value of the DURATION data as the thirteenth data, and the DURATION data as the addition result is written to the work area. At this time, the DURATION data which is the eleventh data is deleted.
[0032]
Similarly, the fifteenth and seventeenth DURATION data and the note-off event data of the second and third channels are written to the work area, and the corresponding note-on event in the buffer is deleted. Then, in step SP145, since the transfer of the SMF data has been completed, this routine ends. Then, after the generated SMF file is temporarily stored in the HDD unit 40, it is input to the electronic device via the I / O control unit or stored in the flexible disk.
[0033]
3. Modified example
The present invention is not limited to the above-described embodiments, and for example, various modifications as described below are possible, and all of them are included in the scope of the present invention.
(1) In the above embodiment, the processing is performed on the SMF file. However, the processing may be performed on an exclusive message file dedicated to a maker.
(2) In the above embodiment, the performance information processing method is executed by a program stored in the ROM 60, but it can also be executed by an application program operating on a personal computer. Performance information obtained by executing the application program or the performance information processing method may be stored in a storage medium such as a CD-ROM or a flexible disk and distributed, or may be distributed through an electric communication line.
[0034]
【The invention's effect】
As described above, according to the present invention, since there is a conversion step of converting performance information so that the number of simultaneously-produced musical tones is equal to or less than the maximum number of pronunciations, the present invention relates to the simultaneously-produced musical tones. Performance information in which the number of events exceeds the maximum number of sounds of the electronic device can be converted into the maximum number of sounds. Further, according to the configuration in which the performance information is converted before outputting to the electronic device that emits sound, the CPU load of the electronic device can be reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a performance information processing apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a performance information processing method according to an embodiment of the present invention and a diagram for explaining an event structure.
FIG. 3 is a diagram showing a specific example of a performance information processing method according to an embodiment of the present invention.
FIG. 4 is an operation panel diagram.
FIG. 5 is a diagram showing a flowchart.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel, 20 ... I / O control part, 30 ... FDD part, 40 ... HDD part, 50 ... CPU, 60 ... ROM, 70 ... RAM, 90 ... Bus line, 100 ... Performance information processing apparatus, 200 ... Events

Claims (9)

In a performance information processing method for converting performance information having a plurality of events reproduced by a sound source built in an electronic device,
If the number of simultaneously pronounced events exceeds a predetermined maximum number of pronunciations, according to a predetermined priority rule, a truncated event detection step of detecting a truncated event to be truncated from the event,
Converting the performance information in accordance with the truncation event so that the number of simultaneously generated musical tones is equal to or less than the maximum number of sounds. 2. The performance information processing method according to claim 1, further comprising a maximum number of sounds setting step for setting the maximum number of sounds. 2. The performance information processing method according to claim 1, further comprising a priority rule selecting step of selecting the priority rule from a plurality of different priority schemes. The truncated event detection step is a step of detecting the oldest event as a truncated event when the number of events related to the simultaneously generated musical sounds exceeds the maximum number of sounds,
2. The performance information processing method according to claim 1, wherein the conversion step is a step of correcting the performance information so as to shorten a last part of a sounding period related to the truncation event. At the time when the number of events related to the simultaneously-produced musical sounds exceeds the maximum number of sounds, a note-off event corresponding to the truncation event is newly inserted, and the last note-off event is deleted to shorten the last part. The performance information processing method according to claim 4, wherein The truncated event detection step is a step of detecting both of these events as the truncated event when there is substantially no time difference between note-on and note-off,
2. The performance information processing method according to claim 1, wherein the conversion step is a step of deleting the truncation event. A performance information processing apparatus for executing the performance information processing method according to claim 1. 2. A performance information processing apparatus configured to execute the performance information processing method according to claim 1 before outputting the performance information to an electronic device that emits sound. A program for executing the performance information processing method according to any one of claims 1 to 6.

Images