JP2002116758A - Waveform editing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform editing device and method which are capable of editing waveform data without being made to wait for even during the course of scanning to form data for display in editing the waveform data and is, on the other hand, is capable of forming and displaying the exact data for display always in the final. SOLUTION: In which range of the waveform data, the data for display of which step is formed is managed as the scan state of management data. When the edition is carried out according to an edition instruction, the scan state is set in an 'unscan' relating to the edited range. On the other hand, the scan processing for forming the data for display is carried out in a background independently from the edition to be executed in a foreground and the data for display is formed relating to the range of the unscan and is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a waveform editing method and apparatus for editing waveform data such as musical sounds.

[0002]

2. Description of the Related Art Conventionally, there is known a waveform editing apparatus for displaying and editing recorded waveform data or waveform data read from a storage medium. The waveform editing device displays and edits the waveform data to be edited on a waveform editing screen. The edited waveform data is stored in a waveform memory or a storage medium.

As a method of displaying waveform data in a conventional waveform editing apparatus, a predetermined number of samples are defined as one block.
There is an example in which the processing speed when the waveform is displayed in a contracted manner is improved by detecting the positive and negative peak values of the waveform data for each block and using the detected peak values as display data. In order to generate and display the display data, it is necessary to read the waveform data to be edited and obtain the peak value of the waveform data for each block as described above (hereinafter referred to as scan).

[0004]

By the way, when editing waveform data, there is a case where it is desired to perform editing processing even before the waveform is clearly displayed on the editing screen, such as filtering of a waveform or cutting of a silent portion. In the waveform editing apparatus, the editing operation cannot be performed until the above-described scan processing is completed. In addition, when editing processing is performed during scanning, there is a problem of how to manage display data.

If the "save" process is performed immediately after the waveform data is edited, it means that the scan has not been completed and the display data has not been obtained yet, and the save instruction has been given. Therefore, the display data is not stored together with the waveform data. Therefore, the next time the waveform data is read from the waveform memory or the storage medium, it must be re-scanned from the beginning of the waveform data to generate display data.

Further, since the scan for creating the display data is performed on the entire waveform data, if the capacity of the waveform data is large (long in time), the display data is completed and displayed neatly. There was a problem that it took time. Further, since the entire waveform is displayed in order from the top, a part desired by the user may not be easily displayed.

[0007] In view of the above-mentioned problems in the prior art, the present invention can edit waveform data without having to wait while editing the waveform data even during a scan for creating display data. On the other hand, it is always possible to create and display accurate display data in the end, save scan time when saving and re-reading the waveform data, and furthermore, to save the part of interest to the user. It is an object of the present invention to provide a waveform editing method and apparatus which can be viewed in detail earlier.

[0008]

In order to achieve this object, an invention according to claim 1 is a waveform editing method for displaying and editing waveform data, wherein the waveform data to be edited is stored in a first storage means. And dividing the waveform data into blocks each having a predetermined number of samples, detecting the maximum value and the minimum value of the blocks sequentially taken out at a predetermined interval from those blocks, and detecting the maximum and minimum values as display data. , A graphic display of the waveform data on the display unit based on the display data of the second storage unit, and a waveform stored in the first storage unit in response to an editing instruction. Performing a data editing process; and invalidating the display data corresponding to the edited waveform data. Characterized by preferential treatment over storing the data.

According to a second aspect of the present invention, there is provided a waveform editing method for displaying and editing waveform data, comprising the steps of: executing a waveform data editing process in response to an editing instruction in a foreground process; Performing a display process of the edited waveform data, the display process, for the edited waveform data, the waveform data is divided into blocks of a predetermined number of samples, The maximum value and the minimum value of the blocks sequentially extracted from the blocks at predetermined intervals are detected, stored as display data, the display data is displayed, and the intervals between the extracted blocks are gradually narrowed. Processing is performed, and finally processing is performed on all blocks.

[0010] The invention according to claim 3 is the invention according to claim 1 or 2.
Wherein the display data is created with priority given to the range actually displayed.

[0011] The invention according to claim 4 is the invention according to claim 1 or 2.
In the waveform editing method according to the above, when saving the waveform data to be edited in a storage medium, even if the display data corresponding to the waveform data is not completed, in addition to the waveform data, The display data and management data indicating the state of its creation are stored, and when the waveform data is read out next, the stored display data and management data are also read out, and the display data is created based on the management data. It is characterized by continuing.

According to a fifth aspect of the present invention, in the waveform editing method according to the fourth aspect, the display data is completed after storing the display data and management data indicating the creation status thereof in addition to the waveform data. Then, the display data and management data stored in the storage medium are automatically updated.

According to a sixth aspect of the present invention, there is provided a waveform editing apparatus for displaying and editing waveform data, comprising: first storage means for storing waveform data to be edited; and display means for displaying the waveform data to be edited. A second storage unit for storing data, wherein the display data is data representing a maximum value and a minimum value of each block obtained by dividing the waveform data to be edited into blocks of a predetermined number of samples. Means for storing, as management data, address information indicating a range in the waveform data and a scan state indicating a generation state of display data for the range, and means for receiving an edit instruction for a predetermined range of the waveform data. Means for performing an editing process on the range of the waveform data stored in the first storage means in response to the received editing instruction, and a range for performing the editing process. Means for changing the scan state of the management data to the initial state, and receiving the editing instruction, editing processing, and a process of changing the setting of the scan state are independent background processes, referencing the management data, A block whose scan state has not been created with display data is searched, display data is created and stored in the second storage means, and a display is performed based on the display data. Means for changing the state.

According to a seventh aspect of the present invention, there is provided a waveform editing apparatus for displaying and editing waveform data, comprising: first storage means for storing waveform data to be edited; and display means for displaying the waveform data to be edited. A second storage unit for storing data, wherein the display data is data representing a maximum value and a minimum value of each block obtained by dividing the waveform data to be edited into blocks of a predetermined number of samples. Means for storing, as management data, address information indicating a range in the waveform data and a scan state indicating a generation state of display data for the range, wherein the scan state indicates that display data has not been created. , A first-stage state indicating that display data for every predetermined number i1 of blocks have been created, and blocks every predetermined number i2 smaller than i1. , A second stage state indicating that display data has been created,..., An (n-1) th stage state indicating that display data for every predetermined number in-1 smaller than in-2 has been created And an n-th state (n is an integer of 2 or more) indicating that display data for all blocks has been created, and means for receiving an edit instruction for a predetermined range of the waveform data. Means for performing an editing process on the range of the waveform data stored in the first storage means in response to the received editing instruction, and initializing a scan state of the management data for the range on which the editing process has been performed. Means for initializing the state to an unscanned state, and a background process independent of accepting the editing instruction, editing processing, and initializing the scanning state. Irradiation and,
A block in which the scan state is not in the n-th stage state is searched, and if so, display data in that range is shifted from the m-th stage to the (m + 1) -th stage in the m-th range of the range including the block. Means for creating and storing in the second storage means, displaying based on the display data, and changing a scan state of the management data.

The invention according to claim 8 is the invention according to claim 6 or 7.
Wherein the display data is created with priority given to the range actually displayed.

The invention according to claim 9 is the invention according to claim 6 or 7.
In the waveform editing device according to the above, when saving the waveform data to be edited in a storage medium, even if the display data corresponding to the waveform data is not completed, in addition to the waveform data, Means for storing the display data and the management data, and when the waveform data is read out next, the stored display data and management data are also read out, and the display data is created based on the management data. It is characterized by continuing.

According to a tenth aspect of the present invention, in the waveform editing apparatus according to the ninth aspect, after the display data and the management data are stored in addition to the waveform data, when the display data is completed, The display data and management data stored in the storage medium are automatically updated.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block configuration of a PC (personal computer) that realizes a waveform editing function according to the present invention. The PC includes a central processing unit (CPU) 101, a read only memory (ROM) 102, a random access memory (RAM) 103, a display 104, and an input device 1.
05, MIDI (Musical Instruments Digital Interf
ace) Interface 106, drive 107, write circuit 109, access management unit 110, waveform memory 1
11, a sound source 112, and a sound system 113. These units are connected to each other by a bidirectional bus line 114.

The CPU 101 controls the operation of the whole PC. The ROM 102 is a storage device that stores a BIOS and the like. The RAM 103 is a storage area for loading a program to be executed by the CPU 101 and securing various buffer areas. The display 104 displays various data according to an instruction from the CPU 101. The input device 105
It is an input device such as a keyboard and a mouse used by a user to input various information. The MIDI interface 106 is an interface for exchanging MIDI data with an external MIDI device. The drive 107 is a drive of an external storage device.
A storage device 108 (hereinafter, simply referred to as a hard disk 108) such as a D-ROM or a hard disk is used.

The writing circuit 109 writes digital waveform data having a predetermined sampling frequency input from the outside into the waveform memory 111 in response to an instruction from the CPU 101. The sound source 112 generates musical sound waveform data based on the waveform data stored in the waveform memory 111 in response to an instruction from the CPU 101, and outputs the data to the sound system 113. Since the sound source 112 performs a plurality of time division channel operations, it is possible to simultaneously generate a plurality of tone waveform data. The access management section 110 prevents the writing circuit 109 from writing the waveform data into the waveform memory 111, the sound source 112 from reading the waveform data from the waveform memory 111, and the CPU 101 from reading and writing the waveform data from the waveform memory 111 so that the collision does not occur. ,
The access timing of the write circuit 109, the sound source 112, and the CPU 101 to the waveform memory 111 is adjusted.

The display unit 104 displays various graphic screens in response to an instruction from the CPU 101. Screens to be displayed include screens for recording a waveform, editing a waveform, selecting a timbre, editing a timbre, and setting a system.

The MIDI interface 106 has M
An IDI keyboard, a MIDI guitar and the like are connected. CPU
Reference numeral 101 denotes a MIDI event input from the MIDI interface 106 or M generated by the sequencer software.
The tone generation state of the sound source 112 is controlled according to the IDI event.

When a MIDI note-on event is received via the MIDI interface 106, the following processing is performed. First, note-on is buffered (R
On AM103). Next, sound generation is assigned to the channel of the sound source 112. Next, control data for controlling generation of a musical tone in accordance with note-on is set in a register of a channel assigned to the sound source 112. The control data includes information for specifying waveform data to be used for sound generation, information for controlling an effect to be given, information for controlling a volume envelope, and the like. Here, the information for specifying the waveform data is the information for selecting the waveform data according to the selected tone color and the pitch of the note-on, and each address of the attack start ATS, the loop start LPS, and the loop end LPE. Is set. Next, a note-on is instructed to the register of the channel. In response to this instruction, the tone generation of the channel starts.

In the PC shown in FIG. 1, a waveform editing program can be started to edit waveform data. FIG.
2 shows an example of a screen for performing waveform editing with the PC of FIG. 1.

When the waveform editing program is started, a window 200 shown in FIG. By specifying the waveform data to be edited on the File menu of the window 200 or the like, the sub-window 201 is opened and the specified waveform data is displayed. Figure 2 shows the subwindow 2 with the waveform data of the file name abc.wab opened.
It is an example displayed in 01. The waveform data to be edited is stored in the hard disk 108 in FIG. 1 in advance. The waveform data recorded in the waveform memory 111 using the writing circuit 109 is stored in the hard disk 108.
And can be edited.

An area 202 at the bottom of the screen is an area for displaying the entire waveform data to be edited. An area 204 is an enlarged display area for designating and displaying a portion of the waveform data to be edited that is to be edited in detail. Bar 203
The range displayed in the enlarged display area 204 in the entire waveform data displayed in the area 202 is shown. That is, a portion of the waveform data corresponding to the left end to the right end of the bar is displayed in the enlarged display area 204. The user can use a pointing device such as a mouse (hereinafter simply referred to as a mouse).
To move the bar 203 left and right,
4, the range to be displayed can be arbitrarily specified. Inversion area 205
Is a range selected by the user by dragging with the mouse, and various edits (e.g., inversion on the time axis, inversion of the sign of the waveform data, fade-in, fade-out, etc.) are performed on the waveform data in the selected section. )It can be performed.

When the waveform is edited on the enlarged display area 204 in FIG. 2, the waveform data is scanned and displayed again to display the edited result. The waveform editing program of the present embodiment displays the waveform roughly even when the scanning of the waveform is not completely completed, and the next editing is possible at that time. This is realized by performing the waveform scanning process in the background as a separate process from the editing process. When editing is performed during the scanning process, the section of the edited waveform data is registered as an unscanned part, and rescanning is performed later. Therefore, no matter how many times editing is performed during scanning, display is finally performed with correct display data without performing unnecessary scanning.

FIG. 3 shows the entire display area 202 or the enlarged display area 204 when the waveform data is edited.
5 shows an example of a screen display in. It is assumed that the waveform data after the position of the arrow 301 has been changed by the editing. At this time, the display data also needs to be changed,
In the present embodiment, scanning and display are performed stepwise.
That is, instead of scanning all the blocks of the waveform data at first (detecting the positive and negative peak values of the waveform sample data in the blocks), the scanning is performed for the blocks extracted every two or more blocks as indicated by 302. Then, the result is displayed as display data. While gradually narrowing the interval between blocks to be scanned, and displaying intermediate results, all blocks are finally scanned and displayed.

FIG. 4 is an example of a change in display after editing.
At first, display such as by scanning blocks taken at large intervals is performed, and then display is performed by scanning blocks taken by gradually narrowing the space between blocks, and finally, Is displayed by scanning all blocks.
The above-described scan and display processes are executed in a background process.

Further, according to the waveform editing program of the present embodiment, when a save instruction is received during the scanning of a waveform,
Information (management data to be described later) indicating which range of the waveform data has been scanned up to which stage (or not yet completed) is stored together with the waveform data, and the next time the waveform data is read out Scan from the previous continuation. Thereby, processing time can be saved. Further, when scanning is performed, the range displayed in the enlarged display area 204 is preferentially performed, so that a portion desired by the user is scanned and displayed first.

FIG. 5 shows a main routine of the waveform editing program (waveform editor) according to the present embodiment. In step 501, various areas are initialized. Then step 5
At 02, it is determined whether or not there has been any operation related to editing of the waveform data. If there is an operation, step 50
In 3, the process corresponding to the operation is executed as a foreground process. If there is no operation in step 502, or after the processing in step 503, step 50
In step 4, the background process is executed, and the process returns to step 502 again.

An editing process corresponding to various editing operations of the waveform data is executed in a foreground process in step 503. At this time, it is necessary to rewrite the display data in accordance with the editing process. However, the creation and update of the display data are executed in the background process of step 504 in the idle time when the foreground process is not executed. Therefore, the next editing operation can be input even when editing processing is performed in the foreground process 503 and display data is being created in the background process 504 for the editing.

The background process 505
When the processing of the foreground process 503 takes a predetermined time or more, the background process 50
This is for executing the same processing as in step 4. Thus, even when the processing time of the foreground process 503 is long, the execution of the display does not stop.

FIG. 6 is a timing chart for explaining the timing of the foreground process and the background process. It is assumed that an editing operation has been performed along the time axis 600 at a timing indicated by an arrow 601 or 602. In response to the editing operation 601, the editing process for the waveform data is performed by the foreground process F.
Executed at A. In response to the editing process, the display process waveform data is generated by the background processes A, B, C, etc., and the stepwise display of the waveform data is performed.

FIG. 7 shows the structure of a waveform file to be edited. As shown in FIG. 7A, a waveform file to be edited includes auxiliary data 702 and waveform data 701. The waveform data 701 is the waveform sample data to be edited. As shown in FIG. 7B, the auxiliary data 702 includes management data 711, display data 712,
And other data 713. Management data 711
As shown in FIG. 7 (c), the set data of the address information and the scan state are arranged. The address information indicates a position in the waveform data 701. The scan state indicates a state of scanning the waveform data from the position of the corresponding address information. The scan state will be described later in detail.

FIG. 8 is an explanatory diagram of the structure of the address of the waveform data and the address of the display data acquisition block.
As shown at 801, the address of the waveform data is composed of 28-bit data. As a result, waveform data of a maximum of 256 M words can be addressed, and waveform data of about 1.5 hours at a sampling frequency FS of 50 kHz can be processed. The size of one block of the display data scan is 256 samples. Therefore, the lower 8 bits of the address of the waveform data are unnecessary data at the time of scanning.

The address for indicating the block for acquiring the display data is an address expression for indicating the range in which the scan was performed. As shown in 802, the lower 8 bits of the waveform data address are truncated ( 20 bits). Since it is 20 bits, it can indicate from the 0th block to the 1,048,575th block. “Address information” used in the management data of FIG. 7C described above.
Is an address indicating a block, and is expressed in 802.

When the waveform data has not been scanned yet, NULL is set as shown at 821.
First stage scan (scan every 2048 blocks)
Is used, an address 822 is used in which the upper 9 bits (9 bits from the most significant of the 28 bits of the waveform data address) are 0 in the lower 11 bits. Since the lower 11 bits of the 20 bits that specify the block to be scanned are always 0, for example, if the upper 9 bits are counted up, discrete blocks of every 2048 blocks can be pointed one after another.
For scanning one block, address 822
By adding an 8-bit area 825 to the lower side of, and counting up this area 825 from 0 to 255, 256 samples in one block can be scanned.

When representing the range where the second stage scan (scan for every 64 blocks) has been completed, the upper 14 bits (14 bits from the most significant of the 28 bits of the waveform data address) and the lower 6 bits are used. The address 823 set to 0 is used. Since the lower 6 bits of the 20 bits that specify the block to be scanned are always 0, for example, if the above 14 bits are counted up, 6
The skipping blocks every four blocks can be pointed one after another. Scanning of 256 samples in one block may be performed by adding an 8-bit area to the lower side in the same manner as described above.

To represent the range where the third stage scan (scan of all blocks) has been completed, a 20-bit address 824 (20 bits from the most significant of the 28 bits of the waveform data address) is used. Since all of the 20 bits that specify the block to be scanned are used,
All blocks from the block to the 1,048,575 block can be pointed one after another. Scanning of 256 samples in one block may be performed by adding an 8-bit area to the lower side in the same manner as described above.

FIG. 9 shows an example of a state during the scanning of waveform data. Reference numeral 900 denotes waveform data to be edited.
This corresponds to the waveform data 701 in FIG. ST is an indicator that indicates the degree or state of the progress of the scan. When ST is 0, no scan is performed; when ST is 1, scan at the first stage; when ST is 2, scan at the second stage;
When T is 3, it indicates that the third-stage scanning is in the range where the scanning is completed. In the example of FIG. 9, the section from the head position 901 to the position 902 of the waveform data is ST = 3,
This indicates that the scanning has been completed up to the third stage. Similarly, in the section from position 902 to position 903, ST =
0 indicates an unscanned state, a section from position 903 to position 904 is ST = 2, a state in which scanning to the second stage is completed, and a section from position 904 to position 905 is ST = 1 and the first.
The state where the scanning is completed up to the stage, and the section from the position 905 to the end position 906 of the waveform data is ST = 3, indicating that the state is completed up to the third stage scanning.

The scanning state of each section of the waveform data is managed by using the management data shown in FIG. That is, the “address information” of the management data in FIG.
901 to 905 are set in the waveform data, and the ST value from that position is set and managed in the corresponding “scan state”. Specifically, the state of FIG.
The address of the position 901 in FIG. 9 is set in the “address information 1” of the management data of (c), the ST value 3 is set in the “scan state 1”, and the address 902 of the position 902 is set in the “address information 2”. Set the address, set the ST value 0 to “scan state 2”, set the address of position 903 to “address information 3”, set the ST value 2 to “scan state 3”, and so on. Is expressed.

FIG. 10A is a flowchart of the scanning process performed in the background process (steps 504 and 505 in FIG. 5). In step 1001, it is determined whether or not the entire range of the waveform data to be edited is set to ST = 3 by referring to the management data. If the entire range ST = 3, it means that the scanning has been completed up to the third stage, and the process is terminated as it is. ST =
If there is a section other than 3, ST =
The block to be scanned this time is determined from the blocks other than 3 and the block is scanned in step 1003 to generate and change display data. In step 1004, the display screen is updated according to the scan result, and in step 10
At 05, the management data is updated, and the process is terminated.

FIG. 10B shows how the management data changes as the scanning process proceeds. Suppose that a certain range of the waveform data is ST = 0 and is in an unscanned state.
Then, the first stage scan processing is performed from the beginning of this range.
The range where the scanning process has progressed is ST = 1.
Then, the entire range becomes the state of ST = 1, and then the second-stage scanning process proceeds to shift to the state of ST = 2. After this entire range has reached ST = 2, the third stage scanning process proceeds in the same manner, so that the entire range finally becomes ST = 3.

The processing in steps 1002 to 1005 is performed block by block. This is because, if the processing of steps 1002 to 1005 is performed collectively for a plurality of blocks, the processing time for once entering the background processing is required. Of course, when the processing capacity of the CPU is high, processing for a plurality of blocks may be performed. When determining a block to be scanned in step 1002, first, the range displayed in the enlarged display area 204 is preferentially scanned. Thereby, the range that the user is paying attention to as the editing target is scanned first.

FIG. 11 shows one of the processes of the foreground process (step 503 in FIG. 5) according to the operation of the user.
1 shows a processing routine for a read instruction event.
When the user designates a waveform file to be edited on the screen of FIG. 2 and instructs reading, the processing of FIG. 11 is executed. In step 1101, a waveform file is detected according to the waveform file name designated by the user. From the waveform file, in step 1102, the waveform data (70 in FIG.
1) is read, display data (712 in FIG. 7B) is read in step 1103, management data (711 in FIG. 7B, FIG. 7C) is read in step 1104, and others are read in step 1105. Data (7 in FIG. 7B)
13) is read. These reads mean that the data
That is, reading into a predetermined buffer on the AM 103.
In step 1106, the waveform graphic display as described in FIG. 2 is performed based on the waveform data, the display data, and the management data, and the process ends.

It should be noted that the display in step 1106 merely performs display based on the read display data. Even if the read display data has not been scanned up to the third stage for the entire range of the waveform, display is performed using the display data at that time (for example, as shown in FIG. 3), and step 1106 is performed. Finish. Thereafter, the scanning proceeds in the process of FIG. 10A executed in the background process, and finally, the scanning of all the blocks is executed, and the display is performed with accurate display data.

FIG. 12 shows a processing routine of an edit instruction event, which is one of the processes of the foreground process. When the user specifies a range of the waveform data on the screen of FIG. 2 and performs some editing instruction operation, the processing of FIG. 12 is executed. In step 1201, specified editing processing is performed on waveform data in a specified range.
Next, in step 1202, the scan state of the range is set to S
Change to T = 0 and end the process. After that, scanning and display are executed by the process of FIG. 10A executed in the background process. In step 1202, the process ends only by setting ST = 0, and scanning and display are left to a background process.
The editing process can be performed again even before the edited range is scanned.

FIG. 13 shows a processing routine of a write instruction event which is one of the processing of the foreground process. When the user instructs to save the waveform data to be edited on the screen of FIG. 2, the processing of FIG. 13 is executed. In step 1301, a file name of a waveform file to be written is determined. Next, in step 1302, waveform data is written, in step 1303, display data is written, and in step 1304, management data is written.
At 5, the other data is written, and the process ends. Writing is writing to an arbitrary storage medium. Even if the waveform data for which the entire range has not been scanned up to the third stage is saved together with the management data and the display data, the scan can be resumed from the saved state the next time it is read, and the processing time can be reduced. Can save.

In the above-described embodiment, the display data and the management data during the scan are stored together with the waveform data when the save instruction is received during the scan, and thereafter, when the scan is completed. The display data and management data stored in the storage medium may be automatically updated with the completed display data and management data.

[0052]

As described above, according to the present invention, when editing waveform data, it is possible to edit the waveform data without having to wait even during the scan for creating the display data. . On the other hand, even if editing is performed during display, accurate display data based on the edited result can always be created and displayed. In storing the waveform data, the display data and the management data are also stored, and when the data is read again, the display data can be continuously generated. Therefore, the time for generating the display data can be saved. Furthermore, since the display data creation of the displayed portion is performed with priority, the portion of interest of the user can be viewed in detail first.

[Brief description of the drawings]

FIG. 1 is a block diagram of a PC (personal computer) that realizes a waveform editing function according to the present invention.

FIG. 2 is a diagram showing an example of a screen for performing waveform editing.

FIG. 3 is an example of a display screen when editing is performed on waveform data;

FIG. 4 is a diagram showing an example of a change in display after editing

FIG. 5 is a flowchart of a main routine of a waveform editing program (waveform editor).

FIG. 6 is a timing explanatory diagram for explaining the timing of processing of a foreground process and a background process.

FIG. 7 is a diagram showing the structure of a waveform file.

FIG. 8 is a structural explanatory view of an address of waveform data and an address of a display data acquisition block.

FIG. 9 is a diagram showing an example of a state during waveform data scanning.

FIG. 10 is a diagram illustrating a flowchart of a scan process and a change in management data.

FIG. 11 is a flowchart of a processing routine of a read instruction event.

FIG. 12 is a flowchart of a processing routine of an edit instruction event;

FIG. 13 is a flowchart of a processing routine of a write instruction event.

[Explanation of symbols]

101: CPU (Central Processing Unit), 102: Read Only Memory (ROM), 103: Random Access Memory (RAM), 104: Display, 105: Input Device, 106: MIDI Interface, 107: Drive Device , 108 CD-ROM, hard disk, etc. 109 writing circuit 110 access management unit
111: waveform memory, 112: sound source, 113: sound system, 114: bus line.

Claims (10)

[Claims] 1. A waveform editing method for displaying and editing waveform data, comprising: storing waveform data to be edited in a first storage means; and dividing the waveform data into blocks each having a predetermined number of samples. Detecting the maximum value and the minimum value of the blocks sequentially taken out at a predetermined interval from those blocks, and storing them in the second storage means as display data; based on the display data in the second storage means. Graphically displaying the waveform data on the display means, editing the waveform data stored in the first storage means in response to an editing instruction, and displaying the waveform data corresponding to the edited waveform data. Invalidating the data, wherein the step of performing the editing process is performed prior to the step of storing the display data. Form editing method. 2. A waveform editing method for displaying and editing waveform data, wherein the editing process is performed in a foreground process according to an editing instruction, and the editing process is performed in a background process. Performing display processing of the waveform data, wherein the display processing divides the waveform data into blocks of a predetermined number of samples for the edited waveform data, and performs a predetermined interval from the blocks. The maximum value and the minimum value of the sequentially extracted blocks are detected and stored as display data, the display data is displayed, and the same processing is performed by gradually narrowing the interval of the extracted blocks. A waveform editing method for processing all blocks. 3. The waveform editing method according to claim 1, wherein the display data is created preferentially in a range that is actually displayed. 4. The waveform editing method according to claim 1, wherein when the waveform data to be edited is stored in a storage medium, display data corresponding to the waveform data is not completed. Also, in addition to the waveform data, the display data and management data indicating the state of its creation are stored, and when the waveform data is read out next, the stored display data and management data are also read out. A waveform editing method characterized by continuing creation of display data based on management data. 5. The waveform editing method according to claim 4, wherein after storing said display data and management data indicating a state of creation thereof in addition to said waveform data, said display medium is completed when said display data is completed. Automatically updating display data and management data stored in a storage device. 6. A waveform editing apparatus for displaying and editing waveform data, comprising: first storage means for storing waveform data to be edited; and second storage means for storing display data for the waveform data to be edited. Storage means, wherein the display data is data representing the maximum value and the minimum value of each block obtained by dividing the waveform data to be edited into blocks of a predetermined number of samples; and Means for storing, as management data, address information indicating a middle range and a scan state indicating a generation state of display data for the range; means for receiving an edit instruction for a predetermined range of the waveform data; A means for performing an editing process on the range of the waveform data stored in the first storage means, and a management for the range on which the editing process is performed. Means for changing the scan state of the data to the initial state, and a background process independent of accepting the editing instruction, editing, and changing the setting of the scan state. Searches for a block for which display data has not been created, creates display data, stores it in the second storage means, performs display based on the display data, and further checks the scan state of the management data. And a means for changing the waveform. 7. A waveform editing apparatus for displaying and editing waveform data, wherein the first storage means stores waveform data to be edited, and the second storage means stores display data for the waveform data to be edited. Storage means, wherein the display data is data representing the maximum value and the minimum value of each block obtained by dividing the waveform data to be edited into blocks of a predetermined number of samples; and Means for storing, as management data, address information indicating a middle range and a scan state indicating a generation state of display data for the range, wherein the scan state indicates that display data has not been created. A scan state, a first stage state indicating that display data for every predetermined number i1 of blocks has been created, and display data for every predetermined number i2 of blocks smaller than i1. ...,...,..., N−1-stage state indicating that display data for every predetermined number in−1 smaller than in−2 has been created, and display of all blocks One of an n-th stage state (n is an integer of 2 or more) indicating that the data for use has been created, means for receiving an edit instruction for a predetermined range of the waveform data, and the received edit instruction Means for performing an editing process on the range of the waveform data stored in the first storage means, and a scan state of the management data for the range on which the edit processing has been performed is an unscanned state which is an initial state. And a background process independent of accepting the editing instruction, the editing process, and the process of initializing the scan state. But the first n
A search is made for a block that is not in the stage state, and if so, display data is created in the range of the m-th stage of the range including the block so as to shift from the m-th stage to the (m + 1) -th stage. And a means for performing display based on the display data, and further changing a scan state of the management data. 8. The waveform editing apparatus according to claim 6, wherein the display data is created preferentially in a range that is actually displayed. 9. The waveform editing apparatus according to claim 6, wherein when the waveform data to be edited is stored in a storage medium, display data corresponding to the waveform data is not completed. Also, in addition to the waveform data, further comprising means for storing the display data and the management data, the next time the waveform data is read out, the stored display data and management data is also read out, A waveform editing apparatus for continuously creating display data based on management data. 10. The waveform editing apparatus according to claim 9, wherein after the display data and the management data are stored in addition to the waveform data, when the display data is completed, the display data is stored in the storage medium. A waveform editing apparatus for automatically updating certain display data and management data.