JP2007052156A - Electronic musical instrument and waveform display program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic musical instrument and a waveform display program, capable of displaying a waveform of good operability by zooming it in or out. <P>SOLUTION: A zoom button 5c as an icon for indicating to zoom in or zoom out a display shows an operation reference point. When setting a display magnification, firstly, a mouse 8 is operated to allow a cursor 5h to meet the icon 5b to which the display magnification function is assigned, and a switch provided on the mouse 8 is clicked. By this operation, the cursor 5h has the display magnification setting function. Next, the cursor 5h is made to meet the zoom button 5c to click the switch of the mouse 8 to drag. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic musical instrument and a waveform display program for displaying a waveform stored in a waveform storage means.

  2. Description of the Related Art Conventionally, an electronic musical instrument that stores a musical sound waveform in a memory and reads out the musical sound waveform to form a desired musical sound is known. Such an electronic musical instrument is provided with a display for displaying a musical sound waveform in order to confirm the waveform of the recorded musical sound and to edit the musical sound waveform.

Japanese Laid-Open Patent Publication No. 2002-116758 (Patent Document 1) discloses a waveform editing apparatus that can edit a waveform stored in a hard disk and display the edited waveform on a display.
JP 2002-116758 A

  In an electronic musical instrument that forms a musical sound by reading out a musical sound waveform, a stored waveform is edited, and parameters relating to the musical sound waveform, for example, an address of a section to be repeatedly read out of the musical sound waveform are set. In such a case, a section to be displayed is specified in the entire musical sound waveform, or it is required to display the musical sound waveform in that section in an enlarged or reduced manner.

  In the conventional waveform display, when the musical sound waveform is enlarged or reduced and displayed, the display magnification for horizontal or vertical enlargement or reduction is set, and the waveform is displayed according to the set display magnification. The Therefore, the operator has to set the display magnification in the horizontal direction and the vertical direction, respectively, and there is a problem that the operability is poor.

  When the displayed screen is enlarged or reduced, the predetermined position on the screen is used as the center of enlargement or reduction. If it is at a distant position, the position may move on the screen, making it difficult to see. In particular, when the image is enlarged, the focused position may protrude from the screen and may not be displayed.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an electronic musical instrument and a waveform display program capable of displaying an enlarged or reduced waveform with good operability.

  To achieve this object, the electronic musical instrument according to claim 1 is stored in a waveform storage means for storing a waveform formed by function values corresponding to a series of variable values, and in the waveform storage means. A display screen for displaying a waveform, from a position specifying means for specifying any one position on a plane having an operation reference point, and an operation reference point at a position specified by the position specifying means A display magnification setting that sets a horizontal display magnification based on the horizontal distance of the image and sets a vertical display magnification based on the vertical distance from the operation reference point at the position specified by the position specifying means. And a waveform display means for displaying a waveform on the display screen in accordance with the display magnification set by the display magnification setting means.

  The electronic musical instrument according to claim 2 is the electronic musical instrument according to claim 1, wherein the plane having the operation reference point is the display screen, and the position designating unit designates one position of the display screen. The display magnification setting means sets a horizontal display magnification based on a horizontal distance between the operation reference point of the display screen and the position specified by the position specifying means, and the operation reference point The vertical display magnification is set based on the vertical distance from the position specified by the position specifying means.

  The electronic musical instrument according to claim 3 is the electronic musical instrument according to claim 2, further comprising operation reference point setting means for setting the operation reference point at an arbitrary position on the display screen by the position specifying means, and the display magnification. The setting means sets a horizontal display magnification based on a horizontal distance between the operation reference point of the display screen set by the operation reference point setting means and the position specified by the position specifying means, and sets the operation reference The vertical display magnification is set based on the vertical distance between the point and the position specified by the position specifying means.

  An electronic musical instrument according to claim 4 is the electronic musical instrument according to any one of claims 1 to 3, wherein an arbitrary position of the display screen is set as an enlargement / reduction reference point that is a center of enlarged display or reduced display of a waveform. An enlargement / reduction reference point setting means; and when the display magnification is set by the display magnification setting means, the waveform display means is centered on the enlargement / reduction reference point set by the enlargement / reduction reference point setting means. The waveform is enlarged or reduced for display.

  5. The electronic musical instrument according to claim 4, wherein the enlargement / reduction reference point setting means sets an arbitrary position of the display screen designated by the position designation means as an enlargement / reduction reference of the display screen. The point is set.

  An electronic musical instrument according to a sixth aspect of the invention is the electronic musical instrument according to the fourth aspect, further comprising range setting means for arbitrarily setting a range of a waveform displayed on the display screen, wherein the enlargement / reduction reference point setting means The center position of the range set by the range setting means is set as the enlargement / reduction reference point.

  An electronic musical instrument according to claim 7 is the electronic musical instrument according to any one of claims 1 to 3, wherein an enlargement / reduction standard is a central point of enlargement or reduction in an image when a waveform image is enlarged or reduced for display. There is an enlargement / reduction reference point setting means for setting a point, and the enlargement / reduction reference point setting means sets the position of the image displayed at the center position of the display screen as the enlargement / reduction reference point.

  An electronic musical instrument according to an eighth aspect of the present invention is the electronic musical instrument according to any one of the fourth to seventh aspects, wherein the waveform display means displays an enlargement / reduction reference point set by the enlargement / reduction reference point setting means on the display screen. The position is matched with the position, and the position of the enlargement / reduction reference point displayed on the display screen is enlarged or reduced without moving.

  The electronic musical instrument according to claim 9 is the electronic musical instrument according to any one of claims 4 to 7, wherein the waveform display means displays a waveform of the enlargement / reduction reference point set by the enlargement / reduction reference point setting means. It moves to the center of the display screen and displays the waveform.

  A waveform display program according to claim 10 is a waveform storage means for storing a waveform formed by function values corresponding to a series of variable values; a display screen for displaying a waveform stored in the waveform storage means; A position detection step for detecting a position designated by a position designation means for designating any one position on a plane having an operation reference point, and the position detection thereof. Based on the horizontal distance from the operation reference point of the position detected by the step, the horizontal display magnification is set, and based on the vertical distance from the operation reference point of the position detected by the position detection step A display magnification setting step for setting a vertical display magnification, and a waveform table for displaying a waveform on the display screen according to the display magnification set by the display magnification setting step. And a step.

  The waveform display program according to claim 11 is the waveform display program according to claim 10, wherein the plane having the operation reference point is the display screen, and the position detection step is specified by the position specifying means. One position of the display screen is detected, and the display magnification setting step includes a horizontal display based on a horizontal distance between the operation reference point of the display screen and the position detected by the position detection step. The magnification is set, and the vertical display magnification is set based on the vertical distance between the operation reference point and the position detected by the position detection step.

  The waveform display program according to claim 12, further comprising an operation reference point setting step of setting the operation reference point at an arbitrary position on the display screen by the position specifying means in the waveform display program according to claim 11. The display magnification setting step sets the horizontal display magnification based on the horizontal distance between the operation reference point of the display screen set by the operation reference point setting step and the position detected by the detection step. The vertical display magnification is set based on the vertical distance between the reference point and the position detected by the position detection step.

  The waveform display program according to claim 13 is the waveform display program according to any one of claims 10 to 12, wherein an arbitrary position on the display screen is set to an enlargement / reduction reference point which is the center of enlarged display or reduced display of the waveform. An enlargement / reduction reference point setting step, and the waveform display step sets an enlargement / reduction reference point set by the enlargement / reduction reference point setting step when the display magnification is set by the display magnification setting step. The waveform is displayed in an enlarged or reduced manner around the center.

  The waveform display program according to claim 14 is the waveform display program according to claim 13, wherein the enlargement / reduction reference point setting step enlarges an arbitrary position of the display screen detected by the position detection step. This is set as the reduction reference point.

  A waveform display program according to a fifteenth aspect of the invention is the waveform display program according to the thirteenth aspect, further comprising a range setting step for arbitrarily setting a range of a waveform displayed on the display screen, and the scaling reference point setting step includes The center position of the range set by the range setting step is set as the enlargement / reduction reference point.

  The waveform display program according to claim 16 is the waveform display program according to any one of claims 10 to 12, wherein an enlargement that is a central point of enlargement or reduction in an image when the waveform image is enlarged or reduced is displayed. There is an enlargement / reduction reference point setting step for setting a reduction reference point, and the enlargement / reduction reference point setting step sets the position of the image displayed at the center position of the display screen as the enlargement / reduction reference point. .

  The waveform display program according to claim 17 is the waveform display program according to any one of claims 13 to 16, wherein the waveform display step displays the enlargement / reduction reference point set by the enlargement / reduction reference point setting step. It is displayed in an enlarged or reduced manner so as not to move the position of the enlargement / reduction reference point displayed on the display screen so as to coincide with the position of the screen.

  The waveform display program according to claim 18 is the waveform display program according to any one of claims 13 to 16, wherein the waveform display step uses a waveform of the enlargement / reduction reference point set by the enlargement / reduction reference point setting step. The waveform is displayed by moving to the center of the display screen to be displayed.

  According to the electronic musical instrument according to claim 1 or the waveform display program according to claim 10, the position designation means for designating any one position on the plane having the operation reference point or the position designated by the position designation means Position detection step, and the position specified by the position specifying means, or the horizontal display magnification is set based on the horizontal distance from the operation reference point of the position detected by the position detecting means. A display magnification setting means or a display magnification setting step for setting the vertical display magnification based on the vertical distance from the operation reference point at the position designated by the means or the position detected by the position detection means, and the display Waveform display means or waveform display step for displaying a waveform on the display screen according to the display magnification set by the magnification setting means or the display magnification setting step. Therefore, the horizontal and vertical display magnifications can be set at the same time by specifying any position on the plane with the position specifying means, and the conventional horizontal and vertical display magnifications can be set respectively. There is an effect that operability is better than in the case of setting.

  According to the electronic musical instrument according to claim 2 or the waveform display program according to claim 11, in addition to the effect produced by the electronic musical instrument according to claim 1 or the waveform display program according to claim 10, a plane having an operation reference point Is a display screen, and the position designation means designates one position of the display screen, and the display magnification setting means is provided between the operation reference point of the display screen and the position designated by the position designation means. The horizontal display magnification is set based on the direction distance, and the vertical display magnification is set based on the vertical distance between the operation reference point and the position specified by the position specifying means. By designating an arbitrary position on the screen by the position designating unit on the same screen as the screen for displaying, the display magnification in the horizontal direction and the vertical direction can be set at the same time, and the operability is good.

  According to the electronic musical instrument according to claim 3 or the waveform display program according to claim 12, in addition to the effect produced by the electronic musical instrument according to claim 2 or the waveform display program according to claim 11, the display screen is displayed by the position specifying means. An operation reference point setting means or an operation reference point setting step for setting an operation reference point at an arbitrary upper position is provided. The display magnification setting means or the display magnification setting step is an operation reference point setting means or an operation reference point setting step. The horizontal display magnification is set based on the horizontal distance between the operation reference point of the display screen set by the position specified by the position specifying means, and the operation reference point and the position specified by the position specifying means. Since the display magnification in the vertical direction is set based on the vertical distance from the Operability can be set position as the operation reference point there is an effect that good.

  According to the electronic musical instrument according to claim 4 or the waveform display program according to claim 13, the electronic musical instrument according to any one of claims 1 to 3, or the waveform display program according to any one of claims 10 to 12. In addition to the effect produced by the above, the image processing apparatus has an enlargement / reduction reference point setting means or an enlargement / reduction reference point setting step for setting an arbitrary position on the display screen as an enlargement / reduction reference point that is the center of the enlarged or reduced display of the waveform, When the display magnification is set by the display magnification setting means or the display magnification setting step, the waveform display means or the waveform display step is set by the enlargement / reduction reference point setting means or the enlargement / reduction reference point setting step. Since the waveform is enlarged or reduced and displayed around the reference point, the center position for enlargement or reduction display can be set arbitrarily. There is an effect that can be user to set the easy-to-read display.

  According to the electronic musical instrument according to claim 5 or the waveform display program according to claim 14, in addition to the effect exerted by the electronic musical instrument according to claim 4 or the waveform display program according to claim 13, the enlargement / reduction reference point setting means Alternatively, since the enlargement / reduction reference point setting step sets an arbitrary position on the display screen designated by the position designation means as the enlargement / reduction reference point of the display screen, the position designation means capable of setting the display magnification. Can be used in combination, and the operability is good.

  The electronic musical instrument according to claim 6 or the waveform display program according to claim 15 is displayed on the display screen in addition to the effects produced by the electronic musical instrument according to claim 4 or the waveform display program according to claim 13. A range setting means or a range setting step for setting a time range of the waveform, and the enlargement / reduction reference point setting means or the enlargement / reduction reference point setting step sets the center position of the range set by the range setting means or the range setting step Since the enlargement / reduction reference point is set, the center position in the case of enlargement or reduction display can be set only by setting the range of the screen on which the user pays attention, and there is an effect that the operability is good.

  The electronic musical instrument according to claim 7 or the waveform display program according to claim 16, wherein the electronic musical instrument according to any one of claims 1 to 3 or the waveform display program according to any one of claims 10 to 12. In addition to the effects produced by the above, the apparatus has an enlargement / reduction reference point setting means for setting an enlargement / reduction reference point, which is the central point of enlargement or reduction in the image when the waveform image is enlarged or reduced for display. Since the point setting means sets the position of the image displayed at the center position of the display screen as the enlargement / reduction reference point, the waveform focused by the user is often located at the center of the display screen. Therefore, when the enlargement / reduction reference point is set at the center of the display screen, there is an effect that when the image is enlarged or reduced, the amount of movement of the focused portion is small and easy to see.

  According to the electronic musical instrument according to claim 8, or the waveform display program according to claim 17, the electronic musical instrument according to any one of claims 4 to 7, or the waveform display program according to any one of claims 13 to 16. In addition to the effect produced by the waveform display means or the waveform display step, the enlargement / reduction reference point set by the enlargement / reduction reference point setting means is made to coincide with the position of the display screen, and the enlargement / reduction reference point displayed on the display screen is adjusted. Since the position is not enlarged and displayed while being enlarged or reduced, there is an effect that, when the image is enlarged or reduced and displayed, the amount of movement of the waveform portion focused on by the user is small and easy to see. .

  According to the electronic musical instrument according to claim 9 or the waveform display program according to claim 18, the electronic musical instrument according to any one of claims 4 to 7, or the waveform display program according to any one of claims 13 to 16. In addition to the effect of the above, the waveform display means moves the enlargement / reduction reference point set by the enlargement / reduction reference point setting means to the center of the display screen for displaying the waveform and displays the waveform. Since the waveform portion being displayed is displayed in the center of the display screen, there is an effect that it is easy to see.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing an electrical configuration of an electronic musical instrument 1 according to an embodiment of the present invention.

  The electronic musical instrument 1 includes a CPU 2, a ROM 3, a RAM 4, a display 5, a flash memory 6, a keyboard 7, a mouse 8, and a sound source 9.

  The CPU 2 is an arithmetic device, and the ROM 3 stores various control programs executed by the CPU 2 and fixed value data referred to when executing the control programs. One of the control programs is a waveform display program 3a, which is a program that displays a musical sound waveform 6a stored in the flash memory 6 and a control waveform 6b that indicates changes in characteristics such as pitch and amplitude of musical sound over time. The display magnification is set by the mouse 8, and the waveform is displayed according to the display magnification.

  The RAM 4 has a working area in which the CPU 2 temporarily stores various data and the like when the control program stored in the ROM 3 is executed, and a display data storage for storing display data when the waveform is displayed on the display 6. A rewritable memory having an area.

  The display 5 is a display constituted by an LCD, and displays waveforms and the like, and icons 5b to 5g for giving commands to the electronic musical instrument 1 and a cursor 5h (see FIG. 2). .

  The flash memory 6 is a rewritable and non-volatile memory that is detachably attached to a slot provided in the electronic musical instrument 1, and changes in characteristics such as the tone waveform 6a and the tone pitch and amplitude of the tone according to the passage of time. Is stored.

  The keyboard 7 is a musical instrument keyboard composed of a plurality of white keys and black keys. The keyboard 7 designates the pitch of the generated musical sound, instructs the start of the sound by pressing the key, and stops the sound by releasing the key. Is instructed.

  When the mouse 8 moves on a plane such as a desk, the amount of movement in the horizontal and vertical directions is detected, the cursor displayed on the display screen is set to an arbitrary position, and the switch 1 or 2 is pressed. In recent years, it is often used in personal computers and the like.

  The sound source 9 generates a musical sound by reading out a musical sound waveform stored and supplied in the flash memory 6 and controls the pitch and amplitude of the generated musical sound based on a control waveform stored in the flash memory 6. To do.

  Next, a display screen displayed on the display 5 will be described with reference to FIG. FIG. 2 is a screen view displayed on the display 5 of the electronic musical instrument 1. The display screen of the display 5 has a waveform display screen 5a for displaying a waveform at the center, a plurality of icons 5b for selecting the function of the cursor 5h on the left side of the waveform display screen 5a, and an enlargement or reduction of the display. Icons 5c to 5g for instructing and a cursor 5h are displayed.

  The cursor 5h can arbitrarily move one position on the display screen by moving the mouse 8 on a plane such as a desk. The icon 5b for selecting the function of the cursor 5h includes a function for setting the display magnification of the waveform displayed on the waveform display screen 5a, a function for designating a waveform range, and an enlarged or reduced display. There is a function for setting a central enlargement / reduction reference point (hereinafter referred to as a viewpoint).

  The zoom button 5c, which is an icon for instructing to enlarge or reduce the display, indicates an operation reference point. When setting the display magnification, first, the mouse 8 is moved to the icon 5b to which the function for setting the display magnification is assigned, the cursor 5h is set, and a switch provided in the mouse 8 is clicked. Thus, the cursor 5h has a function of setting a display magnification. Next, the cursor 5h is set to the zoom button 5c, and the switch of the mouse 8 is clicked and dragged.

  By this operation, the zoom button 5c is turned on, and the display color of the zoom button 5c is changed. The display magnification is set according to the distance between the dragged cursor position and the zoom button 5c. That is, the horizontal display magnification is set by the horizontal distance x between the cursor position and the zoom button 5c, and the vertical display magnification is set by the vertical distance y between the cursor position and the zoom button 5c. Here, the unit of x and y is the number of pixels (number of pixels), and is hereinafter referred to as a magnification setting value.

  When the cursor position is located on the right side of the zoom button 5c, the horizontal display magnification is set to a value larger than 1 (enlarged display), and the display magnification is set larger as the cursor position is farther from the zoom button 5c. The When the cursor position is located on the left side of the zoom button 5c, the horizontal display magnification is set to a value smaller than 1 (reduced display), and the display magnification is set smaller as the cursor position is farther from the zoom button 5c. The

  Similarly, when the cursor position is positioned above the zoom button 5c, the vertical display magnification is set to a value larger than 1 (enlarged display), and the display magnification is set larger as the cursor position is farther from the zoom button 5c. Is done. When the cursor position is positioned below the zoom button 5c, the vertical display magnification is set to a value smaller than 1 (reduced display), and the display magnification is set smaller as the cursor position is farther from the zoom button 5c. Is done. When the dragging is finished and the switch of the mouse 8 is turned off, the zoom button 5c is turned off, and the display color of the zoom button 5c is returned to the original color.

  On the other hand, the four icons 5d to 5g arranged around the zoom button 5c are for setting the magnification in the horizontal direction and the vertical direction, respectively, and the icon 5d decreases the display magnification in the horizontal direction. , Icon 5e increases the vertical display magnification, icon 5f increases the horizontal display magnification, and icon 5g decreases the vertical display magnification. When the cursor 5h is placed on these icons and the switch of the mouse 8 is clicked or pressed, the respective display magnifications can be changed. When the button is clicked, the display magnification is changed by a predetermined unit. When the button is pressed for a long time, the value of the predetermined unit is added or subtracted at a predetermined time interval while the button is pressed.

  When setting the range of the displayed waveform, set the range by dragging on the waveform display screen 5a after clicking the cursor 5h on the icon 5b to which the function for setting the range is assigned. can do. In this embodiment, the range in the horizontal direction is set. By setting the range, it has a function of repeatedly reproducing only the waveform within this range.

  When setting the viewpoint that is the center of enlargement or reduction, the cursor 5h is placed on the icon 5b to which the function for setting the enlargement / reduction reference point that is the center of enlargement or reduction is assigned, and the waveform is displayed. By moving the cursor 5h to an arbitrary position on the screen 5a and clicking at that position, an enlargement / reduction reference point can be set at that position.

  FIG. 3 is a diagram for explaining the relationship between the waveform and the waveform image displayed on the display screen. FIG. 3A is a diagram showing a waveform area indicating which area of the stored waveforms is displayed on the display screen, and is surrounded by a rectangle with sXlen on the horizontal axis and sYlen on the vertical axis. This indicates that the displayed area is displayed. Here, for example, when displaying a musical sound waveform, sXlen is the number of samples, and sYlen is a value indicating an amplitude value. And the case where the value of the vertical axis | shaft with an amplitude value of 0 is set to the position of sYofs from the upper side of sYofs is shown. FIG. 3B shows a state in which the waveform region specified in the waveform region is simply displayed in accordance with the display region, and the state displayed in this way is set as a display magnification of 1. The display screen has a horizontal width of dXlen (pixels) and a vertical width of dYlen (pixels). For example, in the case of the XGA standard, dXlen is 1024 pixels and dYlen is 768 pixels.

The coordinates (dX, dY) of the display area corresponding to an arbitrary point (sX, sY) in the waveform area are based on the upper left corner of the display screen as the origin.
dX = (sX / sXlen) × dXlen
dY = (sYofs−sY) / sYlen × dYlen
Can be obtained as

When instructed to scroll by Xscrl in the horizontal direction and Yscrl in the vertical direction on the display screen, the screen is scrolled as shown in FIG. The scrolled coordinates are
dX = (sX / sXlen) × dXlen−Xscrl
dY = (sYofs−sY) / sYlen × dYlen−Yscrl
It becomes.

  Next, with reference to FIG. 4, a case where a waveform is enlarged or reduced for display will be described. FIG. 4 is a diagram illustrating a state in which zoom that is enlargement or reduction is set. Here, on the display screen, the distance x between the set horizontal cursor position and the zoom button 5c or the distance y between the vertical cursor position and the zoom button 5c is a value in units of pixels. Let Zx and Zy be the respective widths in the waveform region to be expanded or reduced in the horizontal and vertical directions per pixel.

In the horizontal direction, in the case of enlarging, a region narrowed by the width of Zx in the horizontal screen size sXlen is expanded to the width of dXlen. The display is reduced to the width of dXlen. Similarly, in the vertical direction, in the case of enlarging, a region narrowed by the width of Zy in the vertical screen size sYlen is expanded to the width of dYlen. A wide area is displayed with a reduced width of dYlen.
Therefore, if the horizontal scroll amount is Xscroll, the horizontal magnification setting value is x, the vertical scrolling amount is Xscroll, and the vertical magnification setting value is y,
dX = (sX / (sXlen−Zx × x)) × dXlen−Xscrl Expression 1
dY = (sYofs−sY) / (sYlen−Zy × y)) × dYlen−Yscrl Expression 2
It becomes.

  Next, a viewpoint (enlargement / reduction reference point) serving as a center of enlargement or reduction will be described with reference to FIG. FIG. 5 is a diagram for explaining processing in a case where the viewpoint is set at an arbitrary position on the display screen for displaying the waveform and is enlarged and displayed. FIG. 5A is a diagram showing a case where the viewpoint is set at an arbitrary position indicated by a black circle on the display screen. The viewpoint is set by clicking an arbitrary position on the display screen after clicking the icon 5b for setting the viewpoint as described above. As illustrated in FIG. 5A, a mark indicating the viewpoint may be displayed at the screen position of the set viewpoint.

  Next, FIG. 5B shows a case where enlargement display is instructed approximately twice in both the horizontal and vertical directions, and the center of enlargement is the upper left corner (indicated by 0) of the display screen. . In this case, it is shown that when the waveform is enlarged, the viewpoint moves in the lower right direction. When the viewpoint moves in this way, when the display is enlarged or reduced, the viewpoint moves and the point of interest moves. Therefore, the viewpoint must be searched every time the enlargement or reduction is performed. Therefore, in this embodiment, the position of the waveform screen set as the viewpoint is scrolled so as not to move even when enlarged or reduced.

FIG. 5C is a diagram in which the enlarged waveform image is scrolled in the horizontal direction and the vertical direction so that the original viewpoint and the viewpoint of the enlarged waveform image coincide with each other.
The coordinates of the set viewpoint are dXc and dYc, the horizontal and vertical scroll values at that time are Xscr1 and Yscr1, and the horizontal and vertical magnification setting values are x and y, respectively. Given viewpoint positions sXc and sYc,
sXc = ((dXc + Xscrl) / dXlen) × (sXlen−Zx × x)
sYc = (sYof− (dYc + Yscr1) / dYlen) × (sYlen−Zy × y)
It becomes.

Assuming that the viewpoints in this waveform area are the newly set horizontal and vertical magnification setting values x ′ and y ′ and the coordinates on the display screen are dX ′ and dY ′, respectively.
dX ′ = (sXc / sXlen−Zx × x ′) × dXlen−Xscroll
dY ′ = (sYofs−sYc) / (sYlen−Zy × y ′) × dYlen−Yscrl
It becomes.

  Therefore, the image is displayed at a position shifted by dX′−dXc in the horizontal direction and dY′−dYc in the vertical direction. Therefore, the display magnification is changed by scrolling and displaying the waveform enlarged by the magnification setting values x ′ and y ′ in the horizontal direction by − (dX′−dXc) and in the vertical direction by − (dY′−dYc). Even so, the viewpoint can be displayed at a fixed position without moving.

  Next, waveform display processing executed by the CPU 2 of the electronic musical instrument 1 will be described with reference to FIG. 6. FIG. 6 is a flowchart showing the waveform display processing, and the waveform stored in the ROM 3 in the electronic musical instrument 1. In this process, the display program is activated, and either the musical tone waveform 6a or the control waveform 6b stored in the flash memory 6 or the like is selected and executed.

  First, it is determined whether a viewpoint has been set (S1). As described above, the viewpoint is set by setting the position to be the center of enlargement / reduction on the display screen by operating the mouse 8. When the viewpoint is set (S1: Yes), the coordinates (dXc, dYc) of the set viewpoint are stored in the RAM 4 (S2).

  If the viewpoint has not been set (S1: No), and if the process of S2 is completed, it is determined whether or not the zoom button 5c is set to on (S3). If the viewpoint is not set, the viewpoint is initially set to 0.

  If the zoom button 5c is set to ON (S3: Yes), it is determined whether or not the drag position (x, y) has changed (S4). When the drag position changes (S4: Yes), the zoom processing for calculating the zoom display waveform is performed by performing calculation according to Expression 1 and Expression 2 (S5). Next, the position difference between the viewpoint on the waveform and the viewpoint of the waveform displayed by zooming is detected (S6), and the scrolling is performed to obtain the value to scroll in the horizontal and vertical directions according to the detected difference. A waveform is obtained (S7), and drawing is again performed on the display screen of the display 5 (S8).

  If the zoom button 5c is not on in the determination process in S3 (S3: No), or if the drag position is not changed in the determination process in S4 (S4: No), or the redrawing process in S8 is performed. If YES, it is determined whether or not an operation to end the waveform display process has been performed (S9). The operation for ending the waveform display process is performed when an icon for ending not shown is clicked with the mouse 8 or when ending is instructed by a keyboard or the like. If the end of the waveform display process is not instructed in the determination process of S9, the process returns to S1.

  As described above, according to the electronic musical instrument 1 of the present embodiment, the horizontal direction depends on the horizontal distance x between the operation reference point displayed on the waveform display screen and the position arbitrarily designated by the mouse 8. Since the vertical display magnification is set according to the vertical distance y from the arbitrarily specified position, the horizontal and vertical display magnification can be set with a single operation. Is good.

  Further, the viewpoint that becomes the center of enlargement or reduction can be set at an arbitrary position, and the enlarged or reduced waveform is displayed with the viewpoint as the center, so that the enlarged or reduced waveform can be easily seen.

  The display magnification setting means according to claim 1 and the display magnification setting step according to claim 10 correspond to the processing of S5 in the flowchart shown in FIG. 6, and the waveform display means according to claim 1 and claim 10. The waveform display step corresponds to the process of S8 in the flowchart shown in FIG. Further, the enlargement / reduction reference point setting means described in claim 4 and the enlargement / reduction reference point setting step described in claim 13 correspond to the processes of S1 and S2 in the flowchart shown in FIG.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  For example, in the above embodiment, the present invention is applied to the electronic musical instrument 1 having the keyboard 7 or the like. However, in a personal computer, the amplitude value of the waveform is stored in a hard disk or the like by a program, or stored in the hard disk. The present invention may be applied to the case where the amplitude value of the waveform is read to form a musical tone and the waveform is displayed on a display.

  In the above embodiment, an arbitrary position is designated with the mouse 8 on the screen of the display 5 that displays the waveform, and the display magnification is set according to the distance between the position and the operation reference point. Although it is set as the viewpoint, the display screen of the display 5 may be configured by a touch panel and specified by a position pressed by a finger or the like.

  In the above embodiment, an arbitrary position is designated with the mouse 8 on the screen of the display 5 that displays the waveform, and the display magnification is set according to the distance between the position and the operation reference point. The operation reference point set on the plane by a digitizer or tablet that can be specified by pressing the pen on a plane different from the display screen. The display magnification may be set according to the distance from the arbitrarily designated position.

  In the above embodiment, the operation reference point is the zoom button 5c set in advance on the display screen. However, the operation reference point may be arbitrarily set. In that case, the coordinates on the display screen may be set numerically using a keyboard or the like, or may be set using the mouse 8.

  In the above embodiment, the position on the plane where the display magnification is set is set by the mouse 8, but the coordinates on the plane may be set numerically using a keyboard or the like.

  In the above embodiment, the waveform displayed on the screen is a waveform of a musical sound generated by the electronic musical instrument 1, and the horizontal axis is time and the vertical axis is an amplitude level. The horizontal axis, which is the frequency characteristic, is displayed as frequency, and the vertical axis is displayed as spectrum level, or sung voice is input, and the pitch and amplitude level of the voice are detected and displayed over time. Good.

  In the above embodiment, the viewpoint is set to an arbitrary position on the waveform display screen by the mouse 8. However, a predetermined range of the waveform is selected, and the viewpoint is set, for example, at the center of the range. You may do it.

  In the above embodiment, when the viewpoint is not set at an arbitrary position on the display screen, the viewpoint is set at the upper left corner of the display screen. However, the center of the display screen (dXlen / 2, dYlen It may be set to the position of the image displayed at (position having / 2 as a coordinate).

  In the above embodiment, when the viewpoint is set at the position of the display screen, the waveform is displayed so that the viewpoint does not move when the waveform is enlarged or reduced. You may make it display and move to the position of the center of a display screen (position which uses dXlen / 2 and dYlen / 2 as a coordinate). As a result, the viewpoint is always displayed at the center of the display screen, and the display can be easily viewed.

It is a block diagram which shows the electric constitution of the electronic musical instrument in embodiment of this invention. It is a screen figure which shows the display screen displayed on the display of an electronic musical instrument. (A) shows a waveform in the waveform area, (b) shows a state in which the waveform in (a) is displayed in the display area, and (c) shows a state in which the waveform displayed in (b) is scrolled. FIG. It is a figure which shows the parameter in the case of enlarging or reducing a waveform. (A) shows a state in which a viewpoint is set at an arbitrary position in the display area, (b) shows a state in which the viewpoint is enlarged around the origin in the display area, and (c) shows the original viewpoint. It is a wave form diagram which shows the state scrolled and displayed so that it might correspond to a position. It is a flowchart which shows the waveform display process performed by CPU.

Explanation of symbols

1 Electronic musical instrument 2 CPU
4 RAM
5 Display 5c Zoom button (operation reference point)
6 Flash memory (waveform storage means)
8 Mouse (position designation means)

Claims (18)

In an electronic musical instrument comprising waveform storage means for storing a waveform formed by function values corresponding to a series of variable values, and a display screen for displaying a waveform stored in the waveform storage means,
Position specifying means for specifying any one position on a plane having an operation reference point;
The horizontal display magnification is set based on the horizontal distance from the operation reference point at the position designated by the position designation means, and the vertical distance from the operation reference point at the position designated by the position designation means. Display magnification setting means for setting the vertical display magnification based on
An electronic musical instrument comprising waveform display means for displaying a waveform on the display screen in accordance with the display magnification set by the display magnification setting means. The plane having the operation reference point is the display screen, and the position specifying means specifies one position of the display screen,
The display magnification setting means sets a horizontal display magnification based on a horizontal distance between the operation reference point on the display screen and the position designated by the position designation means, and the operation reference point and the position designation means. 2. The electronic musical instrument according to claim 1, wherein a vertical display magnification is set based on a vertical distance from a position designated by. An operation reference point setting means for setting the operation reference point at an arbitrary position on the display screen by the position specifying means;
The display magnification setting means sets a horizontal display magnification based on a horizontal distance between an operation reference point on the display screen set by the operation reference point setting means and a position designated by the position designation means. 3. The electronic musical instrument according to claim 2, wherein a vertical display magnification is set based on a vertical distance between the operation reference point and the position designated by the position designation means. An enlargement / reduction reference point setting means for setting an arbitrary position on the display screen as an enlargement / reduction reference point that is the center of the enlarged display or reduced display of the waveform,
When the display magnification is set by the display magnification setting means, the waveform display means enlarges or reduces the waveform around the enlargement / reduction reference point set by the enlargement / reduction reference point setting means. The electronic musical instrument according to any one of claims 1 to 3, wherein:   5. The electronic apparatus according to claim 4, wherein the enlargement / reduction reference point setting means sets an arbitrary position of the display screen designated by the position designation means as an enlargement / reduction reference point of the display screen. Musical instrument. A range setting means for arbitrarily setting a range of a waveform displayed on the display screen;
5. The electronic musical instrument according to claim 4, wherein the enlargement / reduction reference point setting means sets the center position of the range set by the range setting means as an enlargement / reduction reference point. An enlargement / reduction reference point setting means for setting an enlargement / reduction reference point which is a center point of enlargement or reduction in the image when the waveform image is enlarged or reduced for display;
4. The enlargement / reduction reference point setting means sets the position of an image displayed at the center position of the display screen as an enlargement / reduction reference point. Electronic musical instrument.   The waveform display means matches the enlargement / reduction reference point set by the enlargement / reduction reference point setting means with the position of the display screen so as not to move the position of the enlargement / reduction reference point displayed on the display screen. The electronic musical instrument according to claim 4, wherein the electronic musical instrument is displayed by being enlarged or reduced.   5. The waveform display means displays the waveform by moving the enlargement / reduction reference point set by the enlargement / reduction reference point setting means to the center of the display screen for displaying the waveform. To 7. The electronic musical instrument according to any one of 7 to 7. Executed in a waveform display device comprising waveform storage means for storing a waveform formed by function values corresponding to a series of variable values, and a display screen for displaying the waveform stored in the waveform storage means. In the waveform display program,
A position detecting step for detecting a position specified by a position specifying means for specifying any one position on a plane having an operation reference point;
The horizontal display magnification is set based on the horizontal distance from the operation reference point of the position detected by the position detection step, and the vertical distance from the operation reference point of the position detected by the position detection step. A display magnification setting step for setting a vertical display magnification based on
A waveform display program comprising: a waveform display step for displaying a waveform on the display screen in accordance with the display magnification set in the display magnification setting step. The plane having the operation reference point is the display screen, and the position detecting step detects one position of the display screen specified by the position specifying means,
The display magnification setting step sets a horizontal display magnification based on a lateral distance between the operation reference point of the display screen and the position detected by the position detection step, and the operation reference point and the position detection step. 11. The waveform display program according to claim 10, wherein the display magnification in the vertical direction is set based on the vertical distance from the position detected by. An operation reference point setting step for setting the operation reference point at an arbitrary position on the display screen by the position specifying means;
The display magnification setting step sets a horizontal display magnification based on a horizontal distance between the operation reference point of the display screen set by the operation reference point setting step and the position detected by the detection step, 12. The waveform display program according to claim 11, wherein a vertical display magnification is set based on a vertical distance between an operation reference point and the position detected by the position detecting step. An enlargement / reduction reference point setting step for setting an arbitrary position on the display screen as an enlargement / reduction reference point which is the center of the enlarged display or reduced display of the waveform,
In the waveform display step, when the display magnification is set in the display magnification setting step, the waveform is enlarged or reduced and displayed around the enlargement / reduction reference point set in the enlargement / reduction reference point setting step. The waveform display program according to claim 10, wherein:   14. The electronic apparatus according to claim 13, wherein the enlargement / reduction reference point setting step sets an arbitrary position of the display screen detected by the position detection step as an enlargement / reduction reference point of the display screen. Musical instrument. A range setting step for arbitrarily setting a waveform range displayed on the display screen;
14. The electronic musical instrument according to claim 13, wherein the enlargement / reduction reference point setting step sets the center position of the range set by the range setting step as an enlargement / reduction reference point. An enlargement / reduction reference point setting step for setting an enlargement / reduction reference point that is a center point of enlargement or reduction in the image when the waveform image is enlarged or reduced for display;
13. The enlargement / reduction reference point setting step sets the position of the image displayed at the center position of the display screen as an enlargement / reduction reference point. Electronic musical instrument.   In the waveform display step, the enlargement / reduction reference point set by the enlargement / reduction reference point setting step is made to coincide with the position of the display screen so that the position of the enlargement / reduction reference point displayed on the display screen is not moved. The waveform display program according to any one of claims 13 to 16, wherein the waveform display program is displayed by being enlarged or reduced.   14. The waveform display step displays the waveform by moving the enlargement / reduction reference point set by the enlargement / reduction reference point setting step to the center of the display screen for displaying the waveform. To 16. The waveform display program according to any one of 1 to 16.

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