JP3546801B2 - Waveform data generation method, waveform data storage method, waveform data generation device, and recording medium - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waveform data generation method, a waveform data storage method, a waveform data generation device, and a recording medium suitable for use in musical tone synthesis by software such as a personal computer.
[0002]
[Prior art]
A system for generating a musical tone waveform using a general-purpose personal computer has been proposed by the present applicant (JP-A-10-124060). In this system, waveform data for each frame (for example, 10 msec) is sequentially generated by a CPU of a personal computer based on MIDI data. The generated data is read out frame by frame by the DMA controller, converted to an analog signal via a DA converter, and sounded.
[0003]
[Problems to be solved by the invention]
However, when the algorithm for generating the waveform data is complicated or when the processing capacity of the CPU is low, the calculation of the waveform data is not completed within one frame, so that it is impossible to generate a musical tone waveform. there were. The present invention has been made in view of the above circumstances, and provides a waveform data generation method, a waveform data storage method, a waveform data generation device, and a recording medium that can generate a musical sound waveform in an optimum state according to processing capacity. It is an object.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a waveform data generating method for generating waveform data based on performance information, wherein the waveform data generating a fixed or variable section of waveform data based on the performance information. A data generating step, a step of receiving a first command or a second command, a step of validating performance information in real time when the first command is received, and a predetermined timing when receiving the first command. Performing, as a generation start condition, instructing the waveform data generation process to generate waveform data of each section in real time based on performance information that is enabled in real time; Reproducing the waveform data of each section generated in real time in response to the second command, and receiving the second command, the processing of the waveform data generating step And performing the non-real-time generation of the waveform data of each section as a generation start condition, and receiving the second command, the non-real-time generation of the performance information corresponding to each of the specified sections for the non-real-time generation. And receiving the second command and storing the non-real-time generated waveform data in the memory based on the non-real-time enabled performance information in the waveform data generating step in the waveform data generating step. It is characterized by having.
According to a second aspect of the present invention, in the waveform data generating method for generating waveform data for each fixed or variable section based on performance information, the waveform data is generated by a plurality of different generation methods based on the performance information. Generating a plurality of waveform data to be generated, receiving a first command or a second command, and generating the plurality of waveform data according to whether the received command is the first command or the second command. A step of selecting one of the steps and, upon receiving the first command, instructing the selected step to generate waveform data in each section for the selected step, with a condition that a predetermined timing has been reached as a generation start condition. And receiving the second command, with the completion of the generation of the waveform data in the previous section as a generation start condition, with respect to the selected waveform data generation step, Serial and having a step of instructing generation of waveform data in each section.
According to the third aspect of the present invention, in the waveform data storage method for generating and storing waveform data based on performance information, the waveform data is generated while generating the waveform data in real time based on the performance information. A step of reproducing waveform data, a step of stopping the reproduction halfway, specifying a stop position in the performance information, and a step of generating non-real-time waveform data corresponding to the performance information of the part after the stop position. Storing the non-real-time generated waveform data in a memory.
Further, in the configuration according to claim 4, in the waveform data storage method for generating and storing waveform data based on performance information, the waveform data is generated while generating the non-real-time waveform data based on the performance information. A step of storing waveform data in a memory; a step of displaying position information indicating a position where the non-real-time generation is performed on the waveform data corresponding to the performance information; and a stop instruction during the non-real-time generation. And stopping the non-real-time generation and the storage of the waveform data when the stop instruction is received.
According to a fifth aspect of the present invention, the method according to any one of the first to fourth aspects is performed.
According to a sixth aspect of the present invention, a program for executing any one of the first to fourth methods is recorded.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
1. Hardware configuration of the embodiment
A hardware configuration of a tone synthesis system according to an embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 21 denotes a CPU, which controls each unit via the CPU bus 20 according to a control program described later. A ROM 22 stores an initial program loader and the like. A RAM 23 is loaded with various programs and data described later, and is accessed by the CPU 21. Reference numeral 24 denotes a timer which generates an interrupt to the CPU 21 at predetermined time intervals.
[0006]
A MIDI interface 25 exchanges MIDI signals with an external MIDI device (not shown). A hard disk 26 stores an operating system, various drivers, various application programs, performance information, and the like. Reference numeral 27 denotes a removable disk, which is provided with a CD-ROM, an MO drive, and the like, and stores the same information as the hard disk 26.
[0007]
Reference numeral 28 denotes a display, which is constituted by a CRT or a liquid crystal display or the like, and displays various information to a user. Reference numeral 29 denotes a keyboard and mouse, which inputs various information to the CPU 21 by a user operation. Reference numeral 30 denotes a waveform interface for inputting / outputting an analog signal waveform.
[0008]
Here, details of the waveform interface 30 and the RAM 23 will be described with reference to FIG. In the figure, reference numeral 31 denotes an AD converter, which converts an input analog signal into a digital signal. A sampling clock generator 33 generates a clock signal having a predetermined sampling frequency. Reference numeral 32 denotes a first DMA controller which samples an output signal of the AD converter 31 in synchronization with the clock signal, and transfers the sampling result to a designated location in the RAM 23 by direct memory access.
[0009]
Reference numeral 34 denotes a second DMA controller which reads digital waveform data stored in the RAM 23 by direct memory access in synchronization with a clock signal output from the sampling clock generator 33. A DA converter 35 converts the read digital waveform data into an analog signal and outputs the analog signal.
[0010]
In the RAM 23, reference numeral 36 denotes a waveform table area for storing templates of various waveform data. Reference numeral 37 denotes an input buffer area in which waveform data is written by the first DMA controller 32. An output buffer area 38 stores the waveform data read by the second DMA controller 34. The output buffer area 38 is a ring buffer whose read address is determined by a cyclically incremented read pointer.
[0011]
2. Operation of the embodiment
2.1. Main routine
Next, the operation of the tone synthesis system of this embodiment will be described. The tone synthesis system is a type of application program for a general-purpose personal computer, and operates under the control of an operating system. When a predetermined operation is performed in the shell program of the operating system, a main routine of the present system shown in FIG. 3 is started. In the figure, when the process proceeds to step SP101, predetermined initial settings are performed. Next, when the process proceeds to step SP102, the main window 50 shown in FIG.
[0012]
In the figure, reference numeral 51 denotes an indicator section, on which the name of a music piece to be reproduced is displayed. Reference numeral 52 denotes a tempo indicator, which indicates a tempo when reproducing the waveform data. Reference numeral 53 denotes a tempo setting button for setting the tempo. Reference numeral 54 denotes a key indicator indicating the height of a key when reproducing waveform data, and reference numeral 55 denotes a key setting button for setting the key. Reference numeral 56 denotes a volume indicator indicating the reproduction volume of the waveform data, and reference numeral 57 denotes a volume setting button for setting the volume.
[0013]
Reference numeral 58 denotes a music selection button, which designates a file or a directory in which MIDI data (performance information) to be reproduced is stored. Reference numeral 60 denotes a group of playback operation buttons for specifying operations such as start, end, pause, fast forward, rewind, auto reverse, and skip of waveform data playback. In particular, the start and end of the reproduction are performed by clicking the reproduction start button 62 and the stop button 61 with a mouse. Reference numeral 71 denotes a waveform data recording button, which starts recording of waveform data by clicking with a mouse after a waveform file is determined. Next, a help button 72 displays the contents of a predetermined help file when clicked with a mouse. An end button 73 instructs the end of the tone synthesis system of the present embodiment.
[0014]
Returning to FIG. 3, when the process proceeds to step SP103, it is determined whether any message has been received from the operating system. If "NO" here, the same steps are repeated until the message is detected. Then, when a message is detected, the process proceeds to step SP104, and a process according to the content of the message is performed. Thereafter, the processing of steps SP103 and SP104 is repeated.
[0015]
2.2. Timer processing in operating system
An application program such as the tone synthesis system of the present embodiment can set a timer message for the operating system. When the timer message is set, the timer message is transmitted from the operating system to the application program at predetermined intervals. In the present embodiment, a timer message is transmitted from the operating system to the tone synthesis system every two cycles of the “tempo clock cycle” and the “frame cycle”.
[0016]
Here, the “tempo clock” is a unit of timing at which a MIDI event is generated, and is a period of “1/16” of a quarter note. Therefore, the cycle of the tempo clock is changed each time the tempo is set by the tempo setting button 53 or the like. Further, in the present embodiment, the waveform data is subdivided for each short time and synthesized. The “frame” is a cycle that is a unit of time for synthesizing the waveform data, and is set to, for example, “10 msec”. Here, in the operating system, the priority of the timer message processing is set low, so that the timer message may sometimes be delayed or dropped.
[0017]
2.3. Event processing of music selection button 58
When music selection button 58 is clicked on with a mouse, a message to that effect is transmitted from the operating system to the tone synthesis system. When such a message is detected in step SP103, a child window prompting the user to specify a music file (MIDI file) name is displayed on the display 28 (not shown). Here, when the user specifies the song file name and closes the child window, the song file name is stored, and after the child window is closed, the process returns to the main routine.
[0018]
2.4. Event processing of playback start button 62
When the reproduction start button 62 is clicked on with a mouse after the music file name is specified, the operating system notifies the tone synthesis system of this fact. In the tone synthesis system, the reproduction start routine shown in FIG. Is done. In the figure, when the processing proceeds to step SP1, the current position of the specified music file (the head position in the initial state, the position where the pause operation was performed during the pause, or the position specified by the operator's position specification operation) From that position) is prepared. Further, the transmission of a timer message for each frame period is requested to the operating system. Next, when the process proceeds to step SP2, an instruction to start an operation of a software sound source described later is issued. Next, when the process proceeds to step SP3, the flag RUN is set to "1", and the process returns to the main routine.
[0019]
2.5. Tempo clock event processing
When a tempo clock message is supplied from the operating system in the main routine, a tempo clock event processing routine shown in FIG. 8 is started in step SP104. In the figure, when the process proceeds to step SP11, it is determined whether or not the flag RUN is "1". If "NO" is determined here, the process of this routine ends immediately. On the other hand, if the flag RUN is “1”, that is, if the above-described event processing of the reproduction start button 62 has been performed, “YES” is determined, and the process proceeds to step SP12.
[0020]
In step SP12, a predetermined tempo counter (variable) is incremented by “1”. Here, the tempo counter is initialized to "0" at the time of initial setting. Therefore, the tempo counter becomes a variable for counting the number of tempo clocks after the flag RUN becomes “1”. Next, when the process proceeds to step SP13, the music file prepared in step SP1 is referred to, and it is determined based on the tempo counter whether or not the time to reproduce any event has been reached.
[0021]
If "YES" is determined here, the process proceeds to step SP14, and a MIDI event at the time is generated. For example, when generating any note-on event, a sounding channel for the event is assigned. That is, an area for storing various tone generation parameters and the like for the note-on event is secured in the RAM 23, and tone generation parameters are set according to the type of sound source. If the event is a note-off event, the corresponding tone generation channel is released after silence processing is performed as necessary.
[0022]
2.6. Frame cycle event processing
When a frame cycle message is supplied from the operating system in the main routine, a frame cycle event processing routine shown in FIG. 10 is started in step SP104. In the figure, when the process proceeds to step SP41, the number of samples to be generated is determined according to the number of frames to be generated this time. Although the number of frames to be generated is generally “1”, if a frame period message is missing, the number of frames is added by the number of missing frames.
[0023]
Next, when the process proceeds to step SP42, a buffer area in which waveform data for the number of frames is to be written is prepared. Next, when the process proceeds to step SP43, a sound source processing routine shown in FIG. 11 is started. As will be described later in detail, the sound source processing routine writes the waveform data for the frame into the buffer area previously reserved. Next, when the process proceeds to step SP44, the waveform data is transferred to the output buffer area 38 in order to pass the generated waveform data to the waveform interface 30. When the above processing ends, the processing returns to the main routine. The waveform data transferred to the output buffer area 38 is read by the second DMA controller 34 one sample at a time in each sampling cycle, converted into an analog signal by the DA converter 35, and output by the operation described above.
[0024]
As described above, the output buffer area 38 is a ring buffer, and its read address is determined by a cyclically incremented read pointer. The address at which the newly generated waveform data is stored is determined by the write pointer that is cyclically incremented similarly to the read pointer. The write pointer precedes the read pointer by several frames. As a result, the write pointer and the read pointer indicate two addresses that circulate in the output buffer area 38 while keeping the interval substantially constant.
[0025]
When the frame period message is dropped once or several times consecutively, the distance between the write pointer and the read pointer is temporarily reduced by the number of times. However, the number of times the next time step SP41 is called is reduced. The number of generated frames and the number of samples are determined so as to recover. That is, the interval between the read pointer and the write pointer serves as a time margin for coping with a missing frame period message.
[0026]
2.7. Sound source processing
In the present embodiment, the generation of the waveform data is performed by a software module running on the CPU 21. Software modules that generate waveform data are broadly divided into sound source modules and effect modules. The sound source module is a module that generates waveform data by realizing software such as an FM sound source, a PCM sound source, and a physical model sound source. The effect module is a module that applies effects such as reverb and chorus to already obtained waveform data. is there.
[0027]
The RAM 23 is provided with a buffer for transferring waveform data between each sound source module and the effect module. Here, the flow of waveform data between each module and the buffer is shown in FIG. 14 and FIG. In FIG. 14, the waveform data of part 1 is multiplied by five send levels, and the results of the multiplication are written to the buffers WB1, WB2, WB5, and WB7. After the insertion effect IEF1 is applied to the waveform data of part 2, the send levels of the four systems are multiplied, and the multiplication results are added to the buffers WB1 to WB4. That is, a new multiplication result is added to the contents of the original buffers WB1 to WB4. In this way, the waveform data corresponding to the parts 1 to 16 is written to the buffers WB1 to WB7 at various send levels after performing an insertion effect as necessary.
[0028]
Next, in FIG. 15, an effect EF1 is applied to the contents of the buffers WB3 and WB4 by any of the effect modules, and the result is multiplied by four send levels. , 2, 5, and 6 are added. Next, an effect EF2 is applied to the contents of the buffers WB5, WB6, and the result is multiplied by the send levels of the four systems. . Then, the effect EF3 is applied to the contents of the buffer WB7, and the result is multiplied by the send levels of the two systems, and the result of each multiplication is added to the contents of the buffers WB1, WB2.
[0029]
The contents of the buffers WB1 and WB2 are passed to the calling routine as the final sound source processing result. That is, in the frame cycle event processing routine (FIG. 10), the contents of the buffers WB1 and WB2 are transferred to the output buffer area 38 according to the write pointer. As described above, in the present embodiment, by defining input / output buffers and send levels of a plurality of sound source modules and effect modules, a musical sound waveform can be generated in various modes.
[0030]
If the input / output buffer and the send level are determined in advance, a desired mixing result can be obtained by sequentially executing the sound source module and the effect module. The flowchart is shown in FIG. In the figure, in steps SP51 to SP69, the sound source module and the insertion effect module are sequentially executed, and the waveform data is stored in the buffers WB1 to WB7. Next, in steps SP70 to SP79, the effect modules are sequentially executed, and the final waveform data is stored in the buffers WB1 and WB2. The method of generating a musical tone waveform in this manner is described in detail in Japanese Patent Application Laid-Open No. 10-124060 and Japanese Patent Application No. 10-133761.
In the sound source processing of FIG. 11, n sound source modules and m effect modules are sequentially executed. However, the number and contents of the modules to be executed in the sound source processing are controlled by the user's operation and control. It can be arbitrarily changed according to the code or the like. As the sound source module, types such as a physical model sound source, a PCM sound source, an FM sound source, and a speech synthesis sound source can be selected. Further, even among the same sound source types, sound source modules having different algorithms and sampling frequencies can be selected. On the other hand, as the effect module, reverb, chorus, distortion, compressor, and the like can be selected.
[0031]
2.8. Event processing of stop button 61
When the stop button 61 is clicked on with a mouse, the operating system notifies the tone synthesis system of this fact, and in the tone synthesis system, a reproduction stop routine shown in FIG. 7 is started. In the figure, when the process proceeds to step SP6, the flag RUN is set to "0". As a result, no substantial processing is performed thereafter even when the tempo clock processing routine is called.
[0032]
Next, when the process proceeds to step SP7, an instruction to stop the operation of the software sound source is issued. In other words, similarly to the case where a note-off event has occurred for each sounding channel, the corresponding sounding channel is released after silence processing is performed as necessary. Next, when the processing proceeds to step SP8, the reproduction stop processing of the music file is performed, and the processing returns to the main routine.
[0033]
2.9. Event processing of the waveform data recording button 71
When the waveform data recording button 71 is clicked on with a mouse, the operating system notifies the tone synthesis system of this fact, and the tone data synthesis system starts the waveform data storage routine shown in FIG. In the figure, when the process proceeds to step SP21, reproduction from the current position of the music file is prepared.
[0034]
Here, the "current position" is the head of the music file when the selected music file has not been reproduced yet, and is the position where the music file is being reproduced when the music file is being reproduced. In other words, in the present embodiment, the recording of the waveform data can be performed immediately after the music file is designated, and the recording of the waveform data is started from a desired position during the reproduction of the music file in real time. You can also. Since the sound generation process is not performed during the recording of the waveform, the operating system is requested to stop the timer messages of the “tempo clock cycle” and the “frame cycle”.
[0035]
Next, when the process proceeds to step SP22, a window for prompting input of a waveform file name is displayed on the display unit. When this waveform file name is specified by the user, the file is opened. If the corresponding file name does not exist, a new file is created and opened.
[0036]
A radio button for specifying whether to compress the waveform file is also displayed as an option for specifying the waveform file name. When this radio button is clicked with a mouse, the waveform data is recorded in a file while being compressed. Next, when the process proceeds to step SP23, a waveform data storage window 80 shown in FIG. In FIG. 5, reference numeral 81 denotes a song title display field, on which the song title previously shown on the indicator unit 51 is displayed.
[0037]
Reference numeral 82 denotes a file name display field, on which the previously specified waveform file name is displayed. Reference numeral 83 denotes a progress graph display section, which includes a time (0'00.000) corresponding to the reproduction start position of the music file, a time (2'57.930) corresponding to the last position of the music file, and The time indicating the progress of the generation status (1′36.600) is numerically displayed. In addition, the progress of the generation status with the time from the reproduction start position to the final position as 100% is displayed as a percentage graph. Reference numeral 84 denotes a recording status display unit, which displays the time length of the waveform data stored in the waveform file up to the present and the size of the corresponding waveform file.
[0038]
Reference numeral 85 denotes a disk limit display unit, which displays the free space in the drive (for example, the hard disk 26 or the removable disk 27) to which the waveform file belongs, and the time of recordable waveform data corresponding to the free space. Reference numeral 86 denotes a total size display field, which displays the size of the waveform data when the generated waveform data is recorded by reproducing all of the music file from the reproduction start position to the end position. A stop button 87 is provided for instructing to end the recording of the waveform data halfway and leave a waveform file for storing the waveform data generated up to that point. An abort button 88 is provided to stop recording the waveform data and discard the result.
[0039]
Returning to FIG. 9, when the process proceeds to step SP24, a transfer buffer area for temporarily storing waveform data is secured. Next, when the process proceeds to step SP25, the number of waveform data samples to be generated in the sound source processing routine (FIG. 11) is determined. As described in step SP41, the number of samples is determined in accordance with the omission of the frame period message in the mode in which the sound generation process is performed in real time. However, in the mode of recording waveform data, there is no time limit. It is preferable to select the number of samples with the highest efficiency according to the convenience of the CPU.
[0040]
Next, when the process proceeds to step SP26, a MIDI event corresponding to the range of the waveform data generated this time is searched from the music file, and if an event exists, a corresponding MIDI event is generated. That is, similar to step SP14, when a certain note-on event is generated, a sounding channel for the event is assigned, and when a note-off event is generated, mute processing is performed as necessary. The tone of the corresponding sounding channel starts to decay. Then, after the sound source processing is performed several times, when the musical tone is sufficiently attenuated, the sound channel is released.
[0041]
Next, when the process proceeds to step SP27, a sound source processing routine (FIG. 11) is called. As a result, the waveform data of the number of samples determined in step SP25 is obtained on the buffers WB1 and WB2. Next, when the process proceeds to step SP28, it is determined whether or not the content of the music file has been completed, or whether or not the stop button 87 (or the abort button 88) has been clicked with a mouse. If both conditions are negative, "NO" is determined, and the process proceeds to step SP32.
[0042]
Here, it is determined whether or not the amount of waveform data stored in the RAM 23 has reached a first predetermined amount. If “YES” is determined here, the process proceeds to step SP33. Here, a subroutine (to be described in detail later) shown in FIG. 16 is called, the waveform data is subjected to a compression process, and the obtained compressed data is stored in the RAM 23. Next, when the processing proceeds to step SP34, the display contents of the progress graph display section 83, the recording state display section 84, and the disc limit display section 85 are updated according to the amount of waveform data subjected to the compression processing.
[0043]
Next, when the process proceeds to step SP35, it is determined whether the amount of compressed data stored in the RAM 23 has reached the second predetermined amount. If "YES" is determined here, the process proceeds to step SP36, and the compressed data is transferred to the waveform file. If the amount of waveform data in the transfer buffer area has not reached the first predetermined amount, steps SP32 to SP36 are skipped. Next, the process returns to step SP25, and the number of samples to be generated next is determined. Thereafter, the operation after step SP25 is repeated.
[0044]
Similarly, if the compressed data amount has not reached the second predetermined amount, it is determined "NO" in step SP35, and the operation after step SP25 is repeated with the compressed data not being transferred to the waveform file. Become. If the contents of the music file have been completed, or if the stop button 87 (or the abort button 88) has been clicked on with a mouse, "YES" is determined in the step SP28, and the process proceeds to a step SP29.
[0045]
Here, compression processing is performed on the waveform data remaining in the transfer buffer area to generate compressed data. Next, when the process proceeds to step SP30, the compressed data not yet transferred to the waveform file is transferred to the waveform file. Then, when the process proceeds to step SP31, the waveform file is closed, and the process returns to the main routine. Thereafter, by decompressing and reproducing the generated waveform file, the user can hear the generated tone waveform. On the other hand, when the abort button 88 is operated, the remaining waveform data is discarded in step SP29, and the waveform file is discarded in step SP31.
[0046]
2.10. Details of the compression process
Here, the processing content of the compression processing subroutine called in step SP33 will be described with reference to FIG. In the figure, when the process proceeds to step SP81, a sub-band filter process is executed. That is, a filter process for analyzing the subband is performed on the waveform data, and a frequency sample of each subband is obtained.
[0047]
Next, when the processing proceeds to step SP82, the frequency analysis of the waveform data is performed by the fast Fourier transform processing of the waveform data. Next, when the process proceeds to step SP83, a psychoacoustic model of a masking effect is calculated based on the frequency analysis result, and a noise level allowed in each subband is obtained. Then, the number of bits allocated to each subband is determined based on the signal level of the output of each subband and the allowable noise level.
[0048]
Next, when the process proceeds to step SP84, the bits of the frequency samples of each subband are deleted based on the allocated number of bits, thereby compressing the waveform data. The obtained compressed data is stored in a predetermined area in the RAM 23. Note that if there is compressed data obtained in the past, it is stored subsequently.
[0049]
3. Effects of the embodiment
(1) In the present embodiment, when waveform data is generated by the frame cycle event processing routine (FIG. 10), the waveform data is synthesized on condition that a frame cycle message has occurred. That is, when a frame cycle message occurs, step SP43 is always executed, and it is not determined whether or not the waveform data generation processing in the previous frame has been completed. On the other hand, when generating the waveform data by the waveform data saving routine, the condition is that the previous generation of the waveform data must be completed. In other words, when the sound source processing (step SP27) is performed for the second time or later, it is always after the previous sound source processing is completed.
[0050]
As described above, in the present embodiment, the start condition of waveform data generation can be appropriately determined according to the use of the waveform data (whether to reproduce in real time or create a waveform file). As a result, when reproducing in real time, waveform data can be generated at an accurate timing, and when creating a waveform file, all necessary modules can be operated, so that a highly accurate musical sound waveform can be obtained. Can be.
[0051]
FIG. 12A shows a summary of operations during real-time reproduction. As shown in the figure, the process of reproducing the music data and generating the waveform data is determined by timer messages of a “tempo clock cycle” and a “frame cycle” generated by the operating system based on the output of the timer 24. On the other hand, FIG. 2B summarizes the operation of saving the waveform data in the waveform file. As shown in the figure, the timing of the reproduction of the music data and the generation of the waveform data is arbitrarily set according to the length required for the waveform data generation in the previous frame.
[0052]
(2) Further, in the present embodiment, the start condition of the waveform data generation can be changed during the real-time reproduction. Therefore, by clicking the reproduction start button 62 with the mouse to start reproduction from the beginning of the music and clicking the waveform data recording button 71 when the desired part is reached, the user can obtain the waveform data only for the desired part of the music. Can be obtained.
[0053]
(3) Further, in the present embodiment, since the compression processing is executed when saving the waveform data, the required capacity of the recording medium such as the hard disk 26 or the removable disk 27 can be reduced. For example, in a case where the waveform data having a certain continuous time length is once recorded and then the waveform data is subjected to compression processing, the recording medium needs to have a capacity sufficient to record at least the entire waveform data. On the other hand, in the present embodiment, since the generated waveform data is recorded on the storage medium while compressing it, the waveform data is once recorded and then compressed with the same storage capacity as compared with the case where the waveform data is compressed. Long-time waveform data can be recorded at once.
[0054]
4. Modified example
The present invention is not limited to the embodiments described above, and various modifications are possible, for example, as follows.
[0055]
(1) In the above embodiment, the same sound source module and the same effect module can be used regardless of whether real-time reproduction is performed or a waveform file is created. However, when performing real-time reproduction, various problems occur unless the calculation of the waveform data is completed within the frame period. Therefore, when real-time reproduction is to be performed with a CPU having a low capacity, a substitute module with a light processing load is required. What is necessary is just to make it select.
[0056]
It is preferable to assign the same program number and bank number as the regular module to the substitute module in advance, and to automatically switch the substitute module according to whether or not to perform real-time reproduction. For example, the CPU can detect its own computing ability, compare it with the load of each module, and automatically determine which of the regular module and the substitute module is to be used as the module for real-time generation. Alternatively, it is preferable that the user can specify which substitute module to use for each of the regular modules at the time of real-time generation.
Here, a sound source module or an effect module specified in a music file to be reproduced is called a regular module, and a sound source module or an effect module that can be used in place of the regular module is called a substitute module. The regular module can be changed by the user editing the music file.
[0057]
In the latter case, a part setting window 90 as shown in FIG. 13 may be displayed on the display 28 by a predetermined operation of the user. In the figure, reference numeral 91 denotes a part number display field, in which part numbers "1" to "16" are displayed from top to bottom. Reference numeral 92 denotes a timbre name display field, in which a timbre name assigned to each part is displayed. Reference numeral 93 denotes a regular module name display field, in which a regular (used for generating a waveform file) sound source module name assigned to the part is displayed.
[0058]
Reference numeral 94 denotes a substitute module name display field, in which a sound source module name used in place of a regular module during real-time performance is displayed. The column where the substitute module name is "-" indicates that the regular module is used as it is. Therefore, in the example shown in the figure, the “brass model 2” (physical model sound source) is used for generating the waveform file for the tone color of “sax 2” of part 1, and the “PCM sound source 1” is used for real-time performance. Will be used.
[0059]
In addition, the part setting window 90 has columns for setting various levels. These columns are used for setting the send levels from the sound source modules to the buffers WB1 to WB7, and the details are described in Japanese Patent Application No. 10-133761. The user can change the contents by moving the cursor to a desired column, and thereby, any substitute module can be assigned to all the regular modules.
In the above example, "PCM sound source 1" is assigned as a substitute module for "brass model 2" (physical model sound source), but various other assignments are possible. For example, an FM sound source of 4 operators or 2 operators may be assigned as an FM sound source substitute module of 6 operators, and an FM sound source without a tone filter at a sampling frequency of 24 kHz is assigned as a substitute module of an FM sound source with a sampling frequency of 48 kHz and a tone filter. You can also.
Alternatively, for each sound source module, substitute information data indicating which other sound source module can be substituted may be stored, and the substitute module may be automatically determined or manually designated based on the substitute information. Further, the user may be able to edit the substitute information data.
[0060]
(2) In the above embodiment, the description has been made on the assumption that all the programs of the tone synthesis system are installed in the personal computer. However, these programs are stored in a recording medium such as a CD-ROM or a floppy disk and distributed. May be.
[0061]
(3) In the above embodiment, the waveform data is subjected to the compression processing and transferred to the waveform file. However, the waveform data may be transferred without performing the compression processing. Specifically, steps SP32 to SP36 and steps SP29 to SP31 in FIG. 9 are changed as follows.
In step SP32, instead of comparing the waveform data amount stored in the RAM 23 with the "first predetermined amount" which is a unit of compression, the amount is compared with a "second predetermined amount" which is a unit of transfer. If the predetermined amount has been reached, the process proceeds to step SP33.
In step SP33, the process proceeds to step SP34 without performing any processing.
In step SP34, the display contents of the progress graph display section 83, the recording state display section 84, and the disk limit display section are updated according to the data amount of the waveform data that has not been subjected to the compression processing.
Next, in step SP35, the determination process is not performed, and the process unconditionally proceeds to step SP36.
In step SP36, the uncompressed waveform data on the RAM 23 is transferred to a waveform file on a storage medium.
By the processing in steps SP32 to SP36 described above, every time the data amount of the waveform data generated in step SP27 reaches a predetermined amount, the waveform data is directly transferred (without compression) to the waveform file.
In step SP29, the process proceeds to step SP30 without performing any processing.
In step SP30, the remaining (uncompressed) waveform data is directly transferred to the waveform file.
In step SP31, the waveform file is closed.
According to the processing in steps SP29 to SP31, in response to the stop button 87 being clicked with the mouse, the waveform data remaining in the transfer buffer at that time is directly transferred (without compression) to the waveform file. , The waveform file is closed.
[0062]
【The invention's effect】
As described above, according to the present invention, the generation start condition of the waveform data of each section can be changed according to the use of the waveform data and the like, so that the tone waveform can be generated in an optimum state according to the processing capacity.
[Brief description of the drawings]
FIG. 1 is a block diagram of a musical sound synthesis system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a detailed configuration of a waveform interface 30 and a RAM 23.
FIG. 3 is a flowchart of a main routine of the embodiment.
FIG. 4 is a diagram showing a display example of a main window 50 on the display device 28.
FIG. 5 is a diagram showing a display example of a waveform data saving window 80 on the display 28.
FIG. 6 is a flowchart of a subroutine of the embodiment.
FIG. 7 is a flowchart of a subroutine of the embodiment.
FIG. 8 is a flowchart of a subroutine of the embodiment.
FIG. 9 is a flowchart of a subroutine of the embodiment.
FIG. 10 is a flowchart of a subroutine of the embodiment.
FIG. 11 is a flowchart of a subroutine of the embodiment.
FIG. 12 is a diagram showing an outline of the operation of the embodiment.
FIG. 13 is a diagram showing a display example of a part setting window 90 in a modification of the embodiment.
FIG. 14 is an explanatory diagram of the operation of the sound source module.
FIG. 15 is an operation explanatory diagram of the effect module.
FIG. 16 is a flowchart of a compression processing subroutine.
[Explanation of symbols]
20 CPU bus, 21 CPU, 22 ROM, 23 RAM, 24 timer, 25 MIDI interface, 26 hard disk, 27 removable disk, 28 display, 29 ... keyboard & mouse, 30 ... waveform interface, 31 ... AD converter, 32 ... first DMA controller, 33 ... sampling clock generator, 34 ... second DMA controller, 35 ... DA converter, 36 ... waveform Table area, 37 Input buffer area, 38 Output buffer area, 50 Main window, 51 Indicator part, 52 Tempo indicator, 53 Tempo setting button, 54 Key indicator, 55 … Key setting button, 56… Volume indicator, 57… Volume setting Button 58, a music selection button, 60, a reproduction operation button group, 61, a stop button, 62, a reproduction start button, 71, a waveform data recording button, 72, a help button, 73, an end button, 80 …… Waveform data save window, 81 …… Song name display field, 82 …… File name display field, 83 …… Progress status graph display field, 84 …… Recording status display area, 85 …… Disc limit display area, 87 …… Stop button, 88: Abort button, 90: Part setting window, 91: Part number display field, 92: Tone name display field, 93: Regular module name display field, 94: Substitute module name display field

Claims (6)

In a waveform data generation method for generating waveform data based on performance information,
A waveform data generation process of generating waveform data for a fixed or variable section based on performance information;
Receiving a first command or a second command;
Activating the performance information in real time upon receipt of the first command;
When the first command is received, the real-time generation of the waveform data of each section based on the performance information validated in real time is instructed to the waveform data generation process on the condition that the predetermined timing has been reached. Process
Receiving the first command, reproducing waveform data of each section generated in real time according to the command;
Receiving the second command, instructing non-real-time generation of waveform data of each section as a generation start condition that the processing of the waveform data generation process is completed;
Receiving the second command, validating the performance information corresponding to each of the designated sections for non-real-time generation in a non-real-time manner;
Receiving the second command, storing the waveform data generated in non-real time based on the performance information activated in non-real time in a memory in the waveform data generating step. Data generation method. In a waveform data generation method for generating waveform data for each fixed or variable section based on performance information,
A plurality of waveform data generation processes for generating waveform data by a plurality of different generation methods based on performance information,
Receiving a first command or a second command;
A step of selecting one of the plurality of waveform data generation steps according to whether the received command is the first command or the second command;
Receiving the first command, assuming that a predetermined timing has been reached as a generation start condition, and instructing the selected process to generate waveform data in each section,
Receiving the second command and instructing the selected waveform data generation process to generate waveform data in each of the sections with the completion of generation of the waveform data in the previous section as a generation start condition. And a waveform data generation method. In a waveform data storage method for generating and storing waveform data based on performance information,
A step of reproducing the generated waveform data while generating the waveform data in real time based on the performance information;
Stopping the playback in the middle and designating a stop position in the performance information;
A step of generating non-real-time waveform data corresponding to the performance information of the portion after the stop position,
Storing waveform data generated in non-real time in a memory. In a waveform data storage method for generating and storing waveform data based on performance information,
Storing the generated waveform data in a memory while generating the non-real time waveform data based on the performance information;
A step of displaying position information indicating a position where the non-real-time generation is being performed on waveform data corresponding to the performance information;
Receiving a stop instruction during the non-real-time generation,
Stopping the non-real-time generation and storage of the waveform data upon receiving the stop instruction. A waveform data generating apparatus that performs the method according to claim 1. 5. A recording medium on which a program for executing the method according to claim 1 is recorded.

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