JP2001092450A - Method for generating/processing audio file - Google Patents

Abstract

PROBLEM TO BE SOLVED: To directly convert the music data to the audio data without performing the music data. SOLUTION: This method is provided with a first step setting a sampling frequency, a second step setting a tempo, a third step successively reading in performance information, a fourth step successively converting the performance information successively read in by the third step to the audio data answering to the sampling frequency set by the first step and the tempo set by the second step and a fifth step successively storing the audio data successively converted by the fourth step in a file, and generating the audio file performed with the tempo set by the second step when the audio data are reproduced with the sampling frequency set by the first step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio file generation processing method, and more particularly, to a personal computer or a work station provided with general-purpose processing means such as a central processing unit (CPU). The present invention relates to a method for generating an audio file suitable for use when constructing a synthesizer by software on a general-purpose computer such as a computer.

[0002]

2. Description of the Related Art Conventionally, in order to form musical tones, it has been necessary to use dedicated hardware for producing musical tones, so-called electronic musical instruments.

However, in recent years, as a high-performance CPU is mounted on a general-purpose computer, a synthesizer can be constructed by software without using dedicated hardware to form a musical tone and to give an effect. It has been proposed (for example, JP-A-7-168575).

In a synthesizer constructed by software on such a general-purpose computer (hereinafter, appropriately referred to as “software synthesizer”), S
Performance information (hereinafter, appropriately referred to as "music data") composed of a combination of sounding start instruction data and sounding stop instruction data and time data such as MF (Standard MIDI File) is input. Then, the input music data is converted by the software synthesizer into an audio file which is an amplitude value at a series of sampling times at a predetermined sampling frequency.

[0005] The audio data converted from the input music data is converted into an audio output signal by a sound function mounted on the computer, and is emitted to a space as a musical sound audible through a speaker. Will be.

[0006] By the way, the software
In order to generate an audio file that stores audio data obtained by converting input music data in a synthesizer, the audio data is converted into an audio output signal by a sound function, and then a separate file from the software synthesizer is generated. However, application software that records the audio output signal and converts it into an audio file had to be used.

For this reason, the time for generating the audio file is at least the actual playing time (hereinafter, referred to as the actual playing time).
It is referred to as "real time" as appropriate. ), And there is a problem that the workability is inferior because an audio file is generated.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to play music data instead of playing it. An object of the present invention is to provide an audio file generation processing method which can be directly converted into audio data.

Thus, when the performance of the CPU is high, it is possible to generate and store an audio file earlier than the actual playing time, and it is also necessary to perform complicated processing, for example, to generate a musical sound per unit time. If the number is large,
When a complicated effect is to be applied, processing that cannot be realized in real time is performed over a long period of time so that high-quality musical sounds and performances can be stored as audio files.

[0010]

In order to achieve the above object, an audio file generation processing method according to the present invention provides an audio file generation method that directly outputs audio data from performance information based on set parameters such as a sampling frequency and a tempo.・
Generate a file.

That is, according to the first aspect of the present invention, a first step of setting a sampling frequency;
A second step of setting a tempo, a third step of sequentially reading performance information, and the performance information sequentially read in the third step are combined with the sampling frequency and the second frequency set in the first step. A fourth step of sequentially converting the audio data into the audio data corresponding to the tempo set in the step, and storing the audio data sequentially converted in the fourth step in a file, and storing the audio data in the file. First
And a fifth step of generating an audio file to be played at the tempo set in the second step when the reproduction is performed at the sampling frequency set in the second step.

Here, the order of the processing of the first step, the second step, and the third step is as follows.
The order of the steps is not limited to the order of the second step to the third step, and may be changed to an arbitrary order according to the design convenience of the software program.

Further, in the audio file generation processing method according to the present invention, performance information for a predetermined time is read and converted into audio data, and the converted audio data is stored in a file to generate an audio file. Is repeated to generate an audio file directly from the performance information.

That is, according to a second aspect of the present invention, a first step of reading performance information for a predetermined time, and playing the performance information for a predetermined time read in the first step in audio data. When the conversion of the audio data for the predetermined time in the second step is completed, the reading of the performance information for the predetermined time in the first step is started. And a fourth step of storing the audio data converted in the second step and generating an audio file.

Here, the order of the processing of the third step and the fourth step is not limited to the order of the third step → the fourth step. , The order of the fourth step → the third step may be adopted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an audio file generation processing method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a hardware configuration of a typical general-purpose computer capable of implementing an audio file generation processing method according to the present invention.

The general-purpose computer shown in FIG. 1 has a very general configuration, and has a CPU 12 for performing overall control via a bus (BUS) 10 and a random access memory for storing various parameters and the like.・ Memory (RA
M) and a hard disk
Disk controller for controlling the hard disk 26
16, a video card 18 for processing a display function for controlling display on a display device 28, and a keyboard ke
I / O Card (I / O Car) which is an interface of the Ybord 30 and the mouse 32
d) 20; converting the audio data converted from the performance information into an audio output signal and outputting the audio output signal (A
A sound card (Sound Car) that processes a sound function to be output to the outside as audio out (audio Out)
d) 22 and a MIDI interface (MIDI) which is an interface of an external MIDI device (not shown).
(I / F) 24 is connected.

Hereinafter, of the above-described components, those relating to the implementation of the present invention will be described appropriately.

First, the memory 14 stores various parameters set by the keyboard 30 or the mouse 32 and the like. Various parameters set by the keyboard 30 or the mouse 32 will be described later.

Next, the sound card 22 processes the sound function of the computer, and generates an audio output signal from the audio data generated by the audio file generation processing method according to the present invention. is there.

The MIDI interface 24 is
An interface to which an external MIDI device (not shown) is connected, to which real-time performance information such as a MIDI message generated by the external MIDI device (hereinafter, appropriately referred to as “real-time performance information”) is input. .

Further, the hard disk 26 has an SMF
Performance information consisting of a combination of pronunciation start instruction data and pronunciation stop instruction data and time data such as
That is, music data is stored. When processing the music data stored in the hard disk 26, the music data to be processed is temporarily transferred to the memory 14 and read out from the memory 14 for use.

Next, the keyboard 30 and the mouse 32
Are operators for selecting a desired position or numerical value on the screen of the display device 28 and setting various parameters described later. The contents of the parameters set by the keyboard 30 or the mouse 32 are stored in the memory 1
4 is stored.

Here, various parameters to be set include real-time performance information input to the MIDI interface 24 and parameters used in a real-time performance mode for playing music data at a predetermined tempo.
There are parameters used in an audio file generation mode for directly converting music data to an audio file.

Next, the display device 28 is, for example,
A liquid crystal display (LCD),
The display device 28 includes a GUI (Graphic User Interface) of a synthesizer program.
ce: Graphic user interface) is displayed.

FIG. 2 shows a display example in which parameters used in the real-time performance mode are displayed on the display device 28. FIG. 3 shows parameters used in the audio file generation mode. A display example when displaying on the device 28 is shown.

That is, as shown in FIG. 2, the display device 28 has, as parameters used in the real-time playing mode, an "sampling frequency" area 40 indicating a sampling frequency and an "effect" area 42 indicating an effect. And an area 44 of "maximum number of sounds" indicating the maximum number of sounds, an area 46 of "maximum number of CPUs" indicating the maximum occupancy of the CPU, and music data stored in the hard disk 26. The area 48 of the "input music data file name" indicating the file name of the music data which is the current processing target, and the area 49 of "CANCEL" for canceling the setting of each parameter described above are displayed. Things.

Here, the sampling frequency is "1".
"1 KHz", "22 KHz", and "44 KHz" are set, and "Reverb", "Chorus", "Delay", and "Filter" are set as effects.

In FIG. 2, the sampling frequency “44 KHz” is set in the “sampling frequency” area 40 by the keyboard 30 or the mouse 32.
Is selected, "Reverb" and "Chorus" are selected as effects in the "Effects" area 42, "64" is set as the maximum number of sounds in the "Maximum number of sounds" area 44, and "Maximum CPU occupancy rate" is set. "In the area 46 of" 80 "
(%) "Is set.

As shown in FIG. 3, an area 50 of "sampling frequency" indicating a sampling frequency, which is a parameter used in the audio file generation mode, and an area 51 of "effect" indicating an effect, as shown in FIG. , A “maximum pronunciation” area 52 indicating the maximum number of pronunciations, a “key” area 53 indicating the key, and a “tempo” area 54 indicating the tempo
And the music stored in the hard disk 26
The area 55 of the “input music data file name” indicating the file name of the music data currently being processed among the data, and the file name of the audio file in which the generated audio data is stored. Area 5 of "output audio file name" shown
6, an area 57 of "compression method" indicating the compression method of the generated audio data, and an area 58 of "CANCEL" for canceling the setting of each parameter described above.
And a "START" area 59 for instructing the start of the process of generating an audio file.

Here, the sampling frequency is "1".
"1 KHz", "22 KHz" and "44 KHz" are set, and "Reverb", "Chorus", "Delay" and "Filter" are set as effects.
As compression methods, "ATRAC", "MP3", "MP
EG "and" PCM "are set.

FIG. 3 shows that the keyboard 30 or the mouse 32 uses the sampling frequency “44 KHz” in the “sampling frequency” area 50.
Is selected, "Reverb", "Chorus", "Delay", and "Filter" are selected as effects in the "Effects" area 51, and "64" is set as the maximum number of sounds in the "Maximum number of sounds" area 52. And
In the "key" area 53, a middle key is set,
The middle tempo is set in the area 54 of “tempo”, and “ATRAC” is selected as the compression method in the area 57 of “compression method”.

Then, the operator of the computer uses the keyboard 30 or the mouse 32 while referring to the display on the display device 28 (see FIGS. 2 and 3) as described above to set parameters used in the real-time performance mode. As sampling frequency, effects,
The maximum number of pronunciations and the maximum CPU occupancy are set, and the sampling frequency, effect, maximum number of pronunciations,
The key, tempo, and compression method are set.

FIG. 4 is a block diagram conceptually showing the overall structure of a synthesizer program for realizing the audio file generation processing method according to the present invention in the general-purpose computer (see FIG. 1).

This synthesizer program has an MID
A QUE (queue) 60 for storing real-time performance information such as an I message for a predetermined time and outputting the real-time performance information to a synth engine 64 described later;
A sequencer unit 62 that reads out music data such as MF and outputs the music data to a synth engine 64 to be described later, and the QUE 60 and performance information output from the sequencer unit 62 are input and converted into audio data. A synth engine 64 for outputting to the output unit 66 later, and an output unit 66 for outputting audio data output from the synth engine 64 to either the sound card 22 or an audio file
A real-time control unit 70 for controlling in a real-time performance mode, an audio conversion control unit 72 for controlling in an audio file generation mode, and parameters used in the real-time performance mode and the audio file generation mode as setting information. Sequencer section 62,
It comprises a synth engine 64 and a setting section 74 for outputting to an output section 66.

Hereinafter, each of the above-described components will be described in more detail. First, the setting unit 74 allows the operator of the computer to operate the display device 2 as described above.
8 (see FIGS. 2 and 3), various parameters set using the keyboard 30 or the mouse 32 and stored in the memory 14 are transmitted to the sequencer unit 6.
2. Output as setting information to the synth engine 64 and the output unit 66.

The setting section 74 outputs the key, tempo, and input music data file name of the various parameters to the sequencer section 62. The sampling frequency, effects, maximum number of sounds, and maximum CPU occupancy are calculated by the synth. The output audio file name and the compression method are output to the engine 64 and the output unit 66
Is output to

The setting section 74 can set different parameter values for the same kind of parameter in the real-time performance mode and the audio file generation mode.

Next, the real-time control unit 70
When the QUE 60 is notified by the control signal 1 that the real-time performance information has been input to the control unit 60, the predetermined time (in this embodiment, the “predetermined time” is “10 ms (1
0 ms). ), Interrupts the QUE 60 and the synth engine 64 to send performance information to the synth engine 64 to generate audio data.

When the real-time control unit 70 is notified from the sequencer unit 62 by the control signal 2 that the performance information has been input to the sequencer unit 62, the real-time control unit 70 sets a predetermined time (in this embodiment, "predetermined time"). Is "10ms (1
0 ms). ), The sequencer section 62 and the synth engine 64 are interrupted, and the performance information is sent to the synth engine 64 to control the generation of audio data.

That is, the real-time control unit 70
QUA as a periodic timer interrupt signal every second
The control signal 1 instructing the output of the real-time performance information for 10 msec stored in E60 to the synth engine 64 is output to the QUE 60, and the control signal 1 is output for 10 ms.
As a periodic timer interrupt signal for each ec, a control signal 2 for instructing the synth engine 64 to output the performance information for 10 msec generated from the music data to the synth engine 64 is output to the sequencer unit 62.
When the control signal 1 output from the control signal 60 and the control signal 2 output from the sequencer unit 62 are input, 10
The control in the real-time performance mode is performed by outputting a control signal 3 instructing the generation of msec of audio data to the synth engine 64.

In the audio file generation processing mode, the audio conversion control section 72 sends the control signal 3 from the synth engine 64 to the sequencer section 62 as the control signal 2 to instruct reading of the next performance information. When the processing is started, the control signal 3 is sent to the synth engine 64 to instruct the start of the processing.

That is, when the control signal 3 output from the synth engine 64 is input, the audio conversion control section 72 receives 10 msec generated from the music data.
When the control signal 2 instructing the output of the performance information of the minute to the synth engine 64 is output to the sequencer section 62 and the control signal 2 output from the sequencer section 62 is input,
The control in the audio file generation mode is performed by outputting a control signal 3 instructing the generation of audio data for 10 msec from the performance information to the synth engine 64.

The QUE 60 inputs real-time performance information such as a MIDI message input from an external MIDI device (not shown) via the MIDI interface 24 and transmits the real-time performance information for a predetermined time (in this embodiment, , The “predetermined time” is “10
ms (10 milliseconds). " ) And store
The control signal 1 for notifying the real-time control unit 70 that the real-time performance information has been input to the QUE 60 is output to the real-time control unit 70.

Further, the QUE 60 periodically transmits the control signal 1 every predetermined time from the real-time control unit 70 (in this embodiment, the “predetermined time” is “10 ms (10 milliseconds)”). When an interrupt signal is input, the real-time performance information for 10 ms stored in the QUE 60 is output to the synth engine 64.

Next, the sequencer unit 62 stores performance information prepared in advance such as stored on the hard disk 26, keys such as parameters output from the setting unit 74, a tempo, and an input music data file. The name setting information and the control signal 2 are input.

In the real-time performance mode, the sequencer 62 reads out music data of a file in the hard disk 26 specified by the input music data file name of the setting information, that is, the performance information. Input and store the performance information for a predetermined time (in this embodiment, the “predetermined time” is “10 ms (10 milliseconds)”), and the performance information is input to the sequencer unit 62. Real-time control unit 7
The control signal 2 for notifying 0 is output to the real-time control unit 70.

Further, the sequencer section 62 periodically sends the control signal 2 as a control signal 2 from the real-time control section 70 every predetermined time (in this embodiment, the “predetermined time” is “10 ms (10 milliseconds)”). When a typical interrupt signal is input, 10 ms of performance information stored in the sequencer section 62 is output to the synth engine 64.

On the other hand, the sequencer section 62
In the file generation mode, music data of a file in the hard disk 26 specified by the input music data file name of the setting information, that is,
The performance information is read and input, and the performance information is stored for a predetermined time (in this embodiment, the "predetermined time" is "10 m
s (10 milliseconds) ". ) And outputs a control signal 2 to the audio conversion control unit 72 to notify the audio conversion control unit 72 that the performance information has been input to the sequencer unit 62.

When the sequencer section 62 receives an interrupt signal from the audio conversion control section 72 as the control signal 2, the sequencer section 62 stores the 10 ms signal stored in the sequencer section 62.
The performance information corresponding to the key of the setting information and the tempo is generated from the performance information of the minute and output to the synth engine 64. Further, the sequencer section 62 outputs to the audio conversion control section 72 a control signal 2 for notifying the audio conversion control section 72 that the sequencer section 62 has started generating the performance information in accordance with the key of the setting information and the tempo. Things.

Next, FIG. 5 is a block diagram conceptually showing the structure of the synth engine 64.

The synth engine 64 is assigned to the assigner 8
2 including the performance information decryption / control unit 80
A plurality of voice channels 84 provided at a subsequent stage of the control unit 80, a waveform table 86 storing waveforms read out by the plurality of voice channels 84, and a plurality of effect processing provided at a subsequent stage of the plurality of voice channels 84・
And a mixer processing unit 88.

The voice table 84 has a waveform table reading section 8 for reading a waveform from a waveform table 86.
4a and TVF (Time Variable Fill File)
ter: time-varying filter) 84b and TVA (Time
Variable Amplifier (time-varying amplifier) 84c, a localization control unit (Pan) 84d, an amplification unit 84e, an envelope generation unit (Env) 84f, and L
FO84g.

Then, the synth engine 64 has
The performance information output from the E60 and the sequencer unit 62, the sampling period, the effect, the maximum number of sounds, and the maximum CP which are the parameters output from the setting unit 74.
The setting information of the U occupancy and the control signal 3 are input.

In the real-time performance mode, when the control signal 3 from the real-time control unit 70 is input, the synth engine 64 changes the QUE 60 and the QUE 60 according to the sampling cycle of the setting information, the effect, the maximum number of sounds, and the maximum CPU occupancy. Audio data for 10 msec is generated from the performance information output from the sequencer section 62 and the generated audio data is output to the output section 6.
6, and outputs a control signal 3 to the real-time control unit 70 for notifying the real-time control unit 70 that the generation of audio data in the synth engine 64 has been completed.

To generate audio data from the performance information, specifically, when the performance information is input to the performance information decoding and control unit 80, the sound information (for example, tone color setting) of the performance information is output. , Note-on (sound-instruction instruction), note-off (sound-off instruction), and the like are set to the corresponding voice channel 84 by the assigner 82, while the control commands and the like for the effect of the setting information are stored in the effect mixer processing unit. It is set to 88.

Then, the voice with the above settings is set.
The audio data is generated from the performance information by the processing in the channel 84 and the processing in the effect mixer unit 88 set as described above.

In the audio file generation mode, the synth engine 64 receives the control signal 3 from the audio conversion control unit 72, and receives the control signal 3 from the sequencer unit 62 according to the sampling cycle of the setting information, the effect, and the maximum number of sounds. 10 from the output performance information
msec of audio data is generated, the generated audio data is output to the output unit 66, and the completion of the generation of the audio data in the synth engine 64 is notified to the audio data conversion control unit. The control signal 3 is output to the audio conversion control section 72.

The generation of audio data from the performance information in the audio file generation mode is specifically the same as the generation of audio data from the performance information in the real-time performance mode. , And a detailed description thereof will be omitted.

In the real time performance mode, the output section 66 is generated from audio data output from the synth engine 64, that is, from the QUE 60 and the performance information output from the sequencer section 62 in the synth engine 64. The audio data is output to the sound card 22.

In the audio file generation mode, the output section 66 is generated from audio data output from the synth engine 64, that is, performance information output from the sequencer section 62 in the synth engine 64. The audio data is compressed by the compression method specified by the compression method setting information, which is a parameter output from the setting unit 74, and is output to an audio file having the file name specified by the output audio file name setting information. Things.

The audio file is, for example,
It is set in the memory 14 and can be transferred to the hard disk 26 or the like as needed.

In the above configuration, the audio file generation processing according to the present invention will be described with reference to the flowcharts shown in FIGS.

Here, the outline of the audio file generation processing according to the present invention will be described. An audio file is generated from performance information for 10 msec among the performance information as shown in FIG. In such a case, the time longer than the real time is not required, and the CPU 10
6B, it is possible to generate an audio file in a shorter time than in real time, as shown in FIG. 6B.

FIG. 7 shows a flowchart of the main routine of the synthesizer program. This main routine is executed when the software synthesizer is started.

In this main routine, first,
In the process of step S702, various parameters used in the real-time performance mode and the audio file generation mode of the synthesizer program are initialized.

When the processing in step S702 ends, the flow advances to the processing in step S704 to determine whether or not to play music data.

If it is determined in step S704 that the music data is to be played, prepared performance information such as music data stored in the hard disk 26 is stored in the synthesizer program. Has been entered in step S
The process proceeds to 706.

On the other hand, if it is determined in step S704 that the music data is not to be played, the MID
The real-time performance information such as the I message has been input to the synthesizer program, and the process proceeds to step S708.

In the process of step S706, it is determined whether or not the music data determined to be played in the process of step S704 is to be played in real time, that is, "START" on the screen of the display device 28 by the keyboard 30 and the mouse 32. Area 59 (see FIG. 3) is selected, and it is determined whether or not the mode of the synthesizer program is set to the audio file generation mode.

In the determination processing of step S706, when it is determined that the music data determined to be played in the processing of step S704 is to be played in real time, that is, the keyboard 30 and the mouse 32 are used to display on the screen of the display device 28. If the “START” area 59 (see FIG. 3) has not been selected and the synthesizer program mode is the real-time performance mode, the process proceeds to step S708.

On the other hand, if it is determined in step S 706 that the music data determined to be played in step S 704 is not to be played in real time, that is, the keyboard 30 and the mouse 32 are used to display on the screen of the display device 28. If the "START" area 59 (see FIG. 3) is selected and the mode of the synthesizer program is the audio file generation mode, the process proceeds to step S710.

In the process of step S708, an audio output signal is generated in the sound card 22 in real time based on the input performance information.

That is, step S702 → step S7
04 → By proceeding to the processing of step S708, the MIDI
Processing in a real-time performance mode in which an audio output signal is generated from real-time performance information such as a message is performed.

Specifically, according to the control signal 1 from the real-time control unit 70, the 10
msec of real-time performance information is output to the synth engine 64, and thereafter, the sampling period, effect,
Audio data for 10 msec is generated in the synth engine 64 in accordance with parameters such as the maximum number of sounds and the maximum CPU occupancy (see FIG. 2), and the audio data is output from the output unit 66 to the sound card 22. Thus, an audio output signal is generated, and such processing is repeatedly executed until there is no performance information to be processed.

Step S702 → Step S70
By proceeding from step 4 to step S706 and step S708, processing in a real-time performance mode in which an audio output signal is generated from previously prepared performance information such as music data is performed.

More specifically, according to the control signal 2 from the real-time control unit 70, the performance information for 10 msec generated from the music data in the sequencer unit 62 is output to the synth engine 64, and thereafter, the real-time control unit 70 , Control cycle 3, sampling period, effect, maximum number of sounds and maximum CPU
10 ms according to parameters such as occupancy (see Fig. 2)
The audio data for c is generated in the synth engine 64, and the audio data is output from the output unit 66 to the sound card 22 to generate an audio output signal. The process is repeatedly executed until there is no more performance information.

In step S708, all the performance information is processed, and when there is no more performance information to be processed, the main routine ends.

On the other hand, in step S710, an audio file generation process is performed.
Contains the following subroutines of this main routine:
An audio file generation processing routine executed in step S710 is shown.

Thus, step S702 → step S702
704 → step S706 → step S710,
When the process of step S710 ends, the music
The processing in the audio file generation mode in which an audio file is generated from performance information prepared in advance such as data is performed, and this main routine ends.

Next, the audio file generation processing routine shown in FIG. 8 will be described.
In step 802, the sequencer unit 62 reads 10 msec of music data specified by the input music data file name in the setting information.

When the processing in step S802 is completed, the flow advances to step S804 to determine whether all music data has been converted to an audio file.

If it is determined in step S804 that all the music data has been converted to an audio file, the file specified by the input music data file name in the setting information contains: Since there is no music data that has not been converted to the audio file, the audio file generation processing routine is terminated, and the process returns to the main routine.

On the other hand, if it is determined in step S804 that all the music data has not been converted to an audio file, the file specified by the input music data file name in the setting information is determined. Since there is music data that has not been converted into an audio file, the flow advances to step S806 to perform audio conversion processing.

In the audio conversion processing in step S806, specifically, the control signal 2 from the audio conversion control section 72 converts the music data read into the sequencer section 62 in step S802 into parameters such as keys and tempos. The performance information for 10 msec according to FIG. 3) is output to the synth engine 64, and thereafter, the audio conversion control unit 7
In accordance with the control signal 3 from the control unit 2, audio data for 10 msec is generated in the synth engine 64 in accordance with parameters (see FIG. 3) such as a sampling period, an effect, and a maximum number of sounds, and the audio data is output. The data is output from the unit 66 to an audio file according to parameters such as a compression method and an output audio file name (see FIG. 3).

When step S806 is completed, the process returns to step S802, and the processes in steps S802 to S806 are repeated.

That is, unless it is determined in step S804 that all the music data has been converted to an audio file, the processing of steps S802 to S806 is repeatedly executed, and all the music data is converted to an audio file.・ Can be converted to a file.

Therefore, by reading out the audio data stored in the generated audio file and performing digital / analog (D / A) conversion, a musical tone is generated.

When the generated audio file is reproduced, when the reproduction is performed at the sampling frequency set as the setting information in the audio file generation mode, the tempo set as the setting information in the audio file generation mode is used. Will be played.

When the generated audio file is reproduced, it is not only reproduced according to the parameters used for generating the audio file (see FIG. 3), but also separately for real-time performance. By setting the parameters (see FIG. 2), it is also possible to reproduce according to the set parameters.

As described above, in the audio file generation processing method according to the present invention, the processing in the audio file generation mode is performed under the control of the audio conversion control section 72, and the audio output signal is generated from the performance information. Since the audio file is generated directly without any processing, the audio file can be generated in a shorter time than the time of the real-time performance according to the capacity of the CPU.

Further, in the audio file generation processing method according to the present invention, even if the CPU has a low capacity, the processing is performed over a long period of time, so that the processing is limited to the range of the low CPU capacity. All of the contents of the performance information can be generated as an audio file without any need.

That is, even if the performance of the CPU is insufficient in real-time performance and the number of voices is insufficient, it is difficult to perform faithfully in the content of the performance information.
When a file is generated, parameters can be independently set to high-quality values (see FIG. 3), so that a high-quality audio file can be obtained.

In the above embodiment, various parameters to be set are shown in FIG. 2 and FIG. 3. However, it is needless to say that the parameters are not limited to these, and May be set.

In the above-described embodiment, Q
Although the audio file is not generated from the real-time performance information such as the MIDI message input to the UE 60, the present invention is not limited to this. Of course, the audio file is not limited to this. An audio file may be generated from the real-time performance information. In this case, the real-time performance information is stored in the audio conversion control unit 7.
The configuration may be changed to receive the control of step 2.

[0097]

Since the present invention is configured as described above, the present invention has an excellent effect that music data is not directly played but directly converted into audio data.

Thus, when the performance of the CPU is high, it is possible to generate and store an audio file earlier than the actual playing time, and it is also possible to perform complicated processing, for example, to generate a musical sound per unit time. If the number is large,
When a complicated effect is applied, processing that cannot be realized in real time is also performed over time, so that high-quality musical sounds and performances can be stored as audio files.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a hardware configuration of a typical general-purpose computer capable of implementing an audio file generation processing method according to the present invention.

FIG. 2 is an explanatory diagram showing a display example when parameters used in a real-time performance mode are displayed on a display device.

FIG. 3 is an explanatory diagram showing a display example when parameters used in an audio file generation mode are displayed on a display device.

FIG. 4 is a block diagram conceptually showing an overall configuration of a synthesizer program for realizing an audio file generation processing method according to the present invention.

FIG. 5 is a block diagram conceptually showing a configuration of a synth engine.

FIG. 6 (a) is an explanatory diagram showing a progress time of performance information, FIG. 6 (b) is an explanatory diagram showing an audio file generation processing time according to the present invention,

FIG. 7 is a flowchart of a main routine.

FIG. 8 is a flowchart of an audio file generation processing routine.

[Explanation of symbols]

10 Bus 12 Central Processing Unit (CPU) 14 Memory 16 Disk Controller 18 Video Card 20 I / O Card 22 Sound Card 24 MIDI Interface 26 Hard Disk 28 Display 30 Keyboard 32 Mouse 40, 50 Sampling Frequency Area 42, 51 area for effects 44, 52 area for maximum pronunciation 46 area for maximum CPU occupancy 48, 55 area for input music data file name 49, 58 area for CANCEL 53 area for key 54 area for tempo 56 output audio file Name area 57 Compression method area 59 START area 60 QUE 62 Sequencer section 64 Synth engine 66 Output section 70 Real-time control section 72 Audio conversion Control unit 74 setting unit 80 play information interpreter and control unit 82 assigner 84 voice channels 86 wavetable 88 effects processing and mixing processor

Continued on the front page F-term (reference) 5D378 AD59 BB01 BB02 BB10 BB12 BB15 BB22 GG22 JB04 JC09 MM12 MM16 MM21 MM62 MM65 QQ06 QQ08 QQ32 QQ34 TT13 TT19 TT19

Claims (2)

[Claims] 1. A first step of setting a sampling frequency, a second step of setting a tempo, a third step of sequentially reading performance information, and a step of reading performance information sequentially read by the third step. A fourth step of sequentially converting audio data corresponding to the sampling frequency set in the first step and the tempo set in the second step, and audio sequentially converted in the fourth step Data is sequentially stored in a file, and when the audio data is reproduced at the sampling frequency set in the first step, an audio file played at the tempo set in the second step is stored. Audio file generation processing method having a fifth step of generation 2. A first step of reading performance information of a predetermined time, a second step of converting the performance information of the predetermined time read in the first step into audio data, and When the conversion of the audio data for the predetermined time in the step is completed, a third step of starting reading the performance information for the predetermined time in the first step, and an audio data converted in the second step. And a fourth step of generating an audio file by storing data.