JPH11296176A - Waveform data display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display waveform data without damaging the features of the original shape by providing a display control means or the like for performing control to display values based on the waveform data detected by a detection means on the screen of a display means while time sequentially arranging them for each block. SOLUTION: When a zoom-in button is clicked by a mouse, a current magnification value Zoom is made double (S4) and when a Zoom-out button is clicked, the current magnification value Zoom is made into 1/2 (S6). Next, a number SmP of samples per pixel is calculated from this magnification value Zoom (S7). This sample number SmP is correspondent to the width of the block to extract the waveform data characterizing a waveform. Next, the calculated sample number SmP is discriminated and based on the result, a waveform display routine 1 is executed (S9) for displaying the waveform while reducing a time base or a waveform display routine 2 is executed (S10) for displaying the waveform while expanding the time base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform data display device for visually displaying a waveform of a sound or the like.

Conventionally, for example, a voice or the like is sampled using a sampler or the like and stored as waveform data, and the waveform is later displayed on a screen of a display device based on the waveform data using a personal computer or the like. May be. In this case, the resolution of the screen of the display device is finite, and there is a limitation that, for example, the area where the waveform can be displayed is 400 pixels in the time axis direction (usually the X axis direction). On the other hand, for example, when the sampled waveform data is composed of 50,000 samples of amplitude value data, it is necessary to appropriately thin out the waveform data in order to display the entire shape of the waveform based on the waveform data on, for example, one screen. That is, in the above example, one waveform data is obtained for every 125 samples (that is, waveform data for 124 samples in the middle is uniformly thinned out), and the waveform data after thinning (that is, amplitude value data for 400 samples) is obtained. To display the waveform on the screen.

[0003]

However, such a display method using a simple thinning method uses important data characterizing the waveform shape in the thinned waveform data (for example, when the amplitude value suddenly increases, etc.). There is a possibility that the waveform data of the reduced waveform may be included, and the shape of the displayed waveform may be different from the shape obtained from the original waveform data. In particular, when analyzing the characteristics of a sampled waveform, a sudden increase or decrease in amplitude in a thinned section is often important in analysis.

[0004] The present invention has been made in view of the above circumstances, and has as its object to display waveform data without impairing the characteristics of the original shape of the waveform data.

[0005]

In order to solve the above-mentioned problems, a waveform data display device according to the present invention comprises:
As a first mode, a display means for visually displaying on a screen, a storage means for storing a waveform data string in which waveform data representing the magnitude of amplitude are arranged in time series, and a readout from the storage means Detecting means for detecting, for each predetermined length section of the waveform data string, waveform data representatively representing the characteristic of the waveform of the section from the waveform data string of the section; and waveform data detected by the detecting means. And display control means for controlling to display the values based on the time-series for each section and display them on the screen of the display means.

In this waveform data display device, a column of waveform data is divided into sections of a predetermined length, and in each section, waveform data representatively representing a characteristic of a waveform in the section is detected, and the waveform data is used. Since the waveform is displayed on the screen of the display means, unnecessary waveform data in the section is not thinned, and the characteristics of the waveform are not lost.

[0007] A waveform data display device according to the present invention comprises:
As a second mode, display means for visually displaying on a screen, storage means for storing a waveform data sequence in which waveform data representing the magnitude of amplitude are arranged in time series, and Setting means for setting the degree of expansion and contraction of the time axis of the waveform displayed on the display means; and a waveform data string read from the storage means in a section having a length corresponding to the degree of expansion and contraction set by the setting means. Separating means for separating, for each section separated by the separating means, detecting means for detecting waveform data representatively representing the characteristic of the waveform of the section from the waveform data string of the section, When the set degree of enlargement / reduction is on the enlargement side from a predetermined value, the value based on the waveform data detected by the detection means is displayed by the first display method, and the degree of enlargement / reduction set by the setting means is set to Reduction side from the specified value A value based on the waveform data detected by said detection means in a certain time in the second display method, and display control means for controlling to display on the screen of the display unit. In this waveform data display device, in addition to the features of the above-described waveform data display device of the first embodiment, the setting unit can set the degree of time axis enlargement / reduction, and based on the set degree of enlargement / reduction, After determining the section length, the waveform data detected from that section is displayed by the first or second display method, so that the waveform data is displayed by a display method suitable for each of expansion and contraction of the time axis. It becomes possible.

According to a third aspect of the present invention, there is provided a waveform data display device, a display means for visually displaying on a screen, and a waveform data sequence in which waveform data representing the magnitude of amplitude is arranged in time series. Storage means for storing, for each predetermined length section of the waveform data string read from the storage means, the waveform data string in which the absolute value of the amplitude is the maximum value or the corresponding value is detected from the waveform data string of the section. And display control means for controlling the maximum value or the corresponding value of the waveform data detected by the detection means to be displayed in a time-series manner for each section on the screen of the display means. In this waveform data display device, a waveform data column is divided into sections of a predetermined length, and in each section, the waveform data of which the absolute value of the amplitude representatively representing the characteristic of the waveform of the section is the maximum value or the corresponding value thereof Is detected, and the waveform is displayed on the screen of the display means using the waveform data. Therefore, even if unnecessary waveform data in a section is thinned out, the characteristics of the waveform are not impaired.

According to a fourth aspect of the present invention, there is provided a waveform data display apparatus comprising: a display means for visually displaying on a screen; and a waveform data sequence in which waveform data representing the magnitude of amplitude is arranged in time series. Storage means for storing the waveform data having the maximum value or the corresponding value and the minimum value or the corresponding value corresponding to the maximum value or the corresponding value from the waveform data string of the section for each predetermined length section of the waveform data string read from the storage means. Detecting means for detecting the waveform data of the value, and displaying the maximum value of the waveform data detected by the detecting means or the corresponding value and the minimum value or the corresponding value in a time series for each section and displaying on the screen of the display means And display control means for performing the control. In this waveform data display device, a waveform data column is divided into sections of a predetermined length, and in each section, the waveform data of the maximum value of the amplitude representative of the characteristic of the waveform of the section or the corresponding value of the maximum value and the minimum value of the waveform data Alternatively, the waveform data of the corresponding value is detected, and the waveform is displayed on the screen of the display means using the waveform data. Therefore, even if unnecessary waveform data in a section is thinned out, the characteristic of the waveform is lost. Nothing.

According to a fifth aspect of the present invention, there is provided a waveform data display device comprising: display means for visually displaying on a screen; and a waveform data sequence in which waveform data representing the magnitude of amplitude is arranged in time series. A setting means for setting the degree of time axis scaling of a waveform displayed on the display means based on the waveform data string; and a setting means for setting the degree of scaling set by the setting means. Separating means for separating the waveform data string read from the storage means in a section of length; and for each section divided by the separating means, waveform data having a maximum value or a corresponding value from the waveform data string of the section. Detecting means for detecting the waveform data having the minimum value or the corresponding value, and when the degree of enlargement / reduction set by the setting means is on the enlargement side from a predetermined value, the maximum value or the maximum value of the waveform data detected by the detection means is detected. The corresponding values are arranged in time series for each section, and when the degree of enlargement / reduction set by the setting means is on the reduction side from a predetermined value, the maximum value of the waveform data detected by the detection means or the corresponding value A display control means for arranging the minimum value or its corresponding value in a time series for each section and displaying the minimum value or the corresponding value on a screen of the display means. In this waveform data display device, in addition to the features of the waveform data display devices of the third and fourth embodiments described above, the degree of enlargement or reduction of the time axis can be set by the setting means. Based on the section length, the maximum value of the absolute value of the amplitude detected from the section or the waveform data of the corresponding value is used when the time axis is expanded, and the maximum value of the amplitude or the maximum value is used when the time axis is reduced. Since the waveform is displayed using the corresponding value and the minimum value or the waveform data of the corresponding value, it is possible to display the waveform data in a display method suitable for each of enlargement and reduction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows a schematic configuration of a personal computer system for implementing a waveform data display device as one embodiment according to the present invention. In FIG. 5, the system includes a CRT display device 1, a computer main body device 2, a keyboard 3, a mouse 4, a speaker 5, and the like. Although not shown, the main device 2
CPU, R for storing control programs, various tables, etc.
OM, a RAM that stores waveform data and various data and is also used as a work area, an input / output interface, and a disk driver (for example, a floppy disk drive)
Driver) and the like.

FIG. 6 shows a display example of the screen of the CRT display device 1. In this example, a waveform display area 11 for displaying a waveform shape and buttons 12 and 13 for instructing operations are displayed. The waveform display area 11 is in the time axis direction (X
In the Y-axis direction, the amplitude value of the waveform is displayed. The buttons 12 and 13 are operated by being designated and clicked by a cursor moved and operated by the mouse 4, and the button 12 is a zoom-in button and displays the time axis of the waveform shape enlarged from the current state ( That is, the button 13 is a zoom-out button which is operated when displaying the sampling points with a reduced number of thinnings, and displays the time axis of the waveform shape smaller than the current state (that is, the number of the sampling points is reduced). Display).

The operation of this embodiment will be described below.
FIG. 7 shows an example of waveform data sampled in advance. As shown in the figure, the waveform data is composed of data of the amplitude values of the waveform of 50,000 samples in total. This waveform data is usually recorded on, for example, a disk as an external storage medium, and its waveform shape is stored in a CRT.
When displaying on the display device 1, the data is read into an internal memory (RAM) via a disk driver of the main device 2.

FIG. 2 shows a flowchart of a main routine relating to a waveform display function in the apparatus of this embodiment. In this embodiment, various operation instructions are given by the mouse 4
To move the cursor on the CRT screen to the position of a button, area, or the like for which a desired operation instruction is to be given, and move the mouse 4
This is done by clicking. Therefore, in the main routine, in the standby state of the operation instruction, it is monitored whether any required operation instruction has been issued, that is, whether the mouse 4 has been clicked (step S1). When the mouse 4 is clicked, the input of the mouse (that is, the coordinates of the cursor) is obtained (step S2), and it is determined whether or not the input is a click of the zoom-in button 12 or the zoom-out button 13 (step S3). , S5). If the zoom-in button 12 has been clicked, the current magnification value Zoom is doubled (step S4). If the zoom-out button 13 has been clicked, the current magnification value Zoom is reduced to half. (Step S
6). This magnification value Zoom is for setting the degree of enlargement or reduction of the time axis of the waveform.

Next, the number of samples smp per pixel is calculated from the magnification value Zoom. The number of samples smp corresponds to the width of a section for extracting waveform data characterizing a waveform (corresponding to a section for thinning out conventional data). For example, assuming that the magnification value Zoom = a predetermined reference value (for example, = α) corresponds to a case where the number of samples corresponding to one pixel is 15, the magnification value Zoom is a multiple or a fraction of this reference value. Calculate the number of samples smp.

Next, it is determined whether or not the calculated number of samples smp is “smp ≧ 15”.
If so, the waveform display routine 1 is performed assuming that the waveform is displayed by reducing the time axis (step S9). On the other hand, if the number of samples smp is less than 15, the time axis is expanded and the waveform is displayed. Waveform display routine 2
Is performed (step S10).

FIG. 3 shows a flowchart of a waveform display routine 1 for reducing the display of the time axis. In the waveform display routine 1, a display pointer for indicating the position of the time axis (X axis) of the waveform display area 11 on the display screen of the CRT display device 1 is prepared. Since the waveform display area 11 has 400 pixels in the X-axis direction, the value of the display pointer is 1
４００400. First, the value of the display pointer is set to the value of the position of the first pixel of the waveform display area 11 (1 in this example).
(Step S11).

A start address and an end address for reading the waveform data of the section corresponding to the display pointer from the memory are obtained (step S12). This section is a section of the waveform data for the number of samples smp calculated from the magnification value Zoom. Therefore, the start address and the end address are addresses of the memory in which the waveform data for the number of samples smp is stored. The waveform data is read out as an instantaneous value of the amplitude of the number of samples smp, for example, as shown in FIG. From the read waveform data (amplitude value), the maximum value and the minimum value (the maximum value on the negative side in the example of FIG. 8) are obtained (step S13). The coordinates of the waveform data of the maximum value on the Y axis (amplitude value) are obtained (step S14),
Similarly, the coordinates of the minimum value waveform data on the Y axis are obtained (step S15), and a line connecting the maximum value and the minimum value is drawn on the time axis indicated by the display pointer of the waveform display area 11 as shown in FIG. Is drawn in the Y-axis direction at the position (step S16).

Thereafter, the display pointer is advanced by one so that the value of the display pointer becomes the position of the next pixel (step S17). Then, the same processing (steps S12 to S17) is repeated until the last position (position of the display pointer is 400) of the waveform display area 11 is reached (step S18). As a result, the waveform data of 50,000 samples is converted into the
For each section divided for each p, the characteristic of the waveform in each section is expressed by a line segment indicating the maximum value and the minimum value of the amplitude in the section, and the line segment is arranged on the time axis to form a waveform. Will be expressed. FIG. 9 shows an example of a reduced display of the waveform displayed in the waveform display area 11. A waveform in which the time axis is reduced and displayed by such a method well represents characteristics of the shape of the original waveform.

FIG. 4 shows a flowchart of a waveform display routine 2 for performing enlarged display of the time axis. In the waveform display routine 2 as well, a display pointer similar to that described above for indicating the position of the time axis (X axis) of the waveform display area 11 on the display screen of the CRT display device 1 is prepared. First, the value of the display pointer is set to the value of the position of the first pixel of the waveform display area 11 (1 in this example) (step S21). Next, the coordinates of the waveform data corresponding to the display pointer are calculated (step S22). This is to select waveform data of a representative value, which will be described later, from the waveform data of the number of samples smp in the first section of the waveform data corresponding to the value (= 1) of the display pointer, and to set the coordinates of the representative value on the Y axis. (That is, the amplitude value). The obtained coordinates are stored (step S23).

Thereafter, the display pointer is advanced from the head position to the next pixel position. Then, a start address and an end address for reading the waveform data of the section corresponding to the display pointer from the memory are obtained (step S1).
2). As described above, this section is a section of the waveform data for the number of samples smp calculated from the magnification value Zoom, and therefore, the start address and the end address are the number of samples sm.
This is an address of a memory in which p waveform data are stored. A maximum value and a minimum value are obtained from the read out waveform data (amplitude values) for the number of samples (smp) (step S13), and one of the maximum value and the minimum value having a larger absolute value is set as a representative value (step S13). S26). Then, a line is connected in the horizontal direction between the coordinates of the representative value of the previous time (the immediately preceding pixel position) and the coordinates of the representative value obtained this time (step S2).
8) After storing the coordinates of the representative value obtained this time (step S
29) The display pointer is advanced to the next pixel (step S30). Then, the same processing (steps S12 to S1)
7) is repeated until the last position of the waveform display area 11 (the value of the display pointer is 400) (Step S)
18).

Thus, for each section obtained by dividing the waveform data of 50,000 samples by the number of samples smp,
Each section is represented by the waveform data having the largest absolute value of the amplitude in the section, and the waveform shape is expressed by drawing a line connecting the amplitude values of the waveform data. The waveform in which the time axis is enlarged and displayed by such a method well represents characteristics of the shape of the original waveform.

FIG. 1 shows an example of a more specific screen display on the screen of the CRT display device 1. As shown
Buttons and areas for instructing various operations are displayed on the upper side of the screen, a waveform display area 11 for displaying a waveform shape is provided in the center side of the screen, and a zoom-in button 12 and a zoom-out button 13 are provided on the lower side of the screen. Displayed at the right end.

In implementing the present invention, various modifications are possible. For example, in the above-described embodiment, when the time axis is reduced below a certain value, the section is represented by a vertical line segment connecting the maximum value and the minimum value in each section, but the present invention is not limited to this. In the same manner as in the enlarged display of the time axis in the above-described embodiment, a line segment connecting the maximum values of adjacent sections to each other in the horizontal direction or a line segment connecting the minimum values to each other in the horizontal direction (in other words, The waveform may be represented by an envelope. Conversely, in the above-described embodiment, the maximum value of the adjacent section is connected by a line in the horizontal direction at the time of enlarged display of the time axis, but this is connected to the maximum value of each section as in the reduced display of the time axis. The waveform may be expressed in the form of a vertical line indicating, that is, a Bergrack.

In the above embodiment, the maximum value or the minimum value of the amplitude is detected one by one from each section, and the waveform is displayed based on the detected value.
However, the present invention is not limited to this. For example, five sections having a large amplitude are sequentially taken from a maximum value side in a certain section, and an average value thereof is taken, and the average value is used as a value corresponding to the maximum value. Is also good. The same applies to the minimum value.

[0026]

As described above, according to the present invention, it is possible to expand and reduce the time axis for display without impairing the characteristic of the original shape of the waveform data.

[Brief description of the drawings]

FIG. 1 is a diagram showing a specific display example of a screen in an apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a main routine in the embodiment device of the present invention.

FIG. 3 is a flowchart showing a waveform display routine 1 in a main routine of the apparatus according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a waveform display routine 2 in a main routine of the apparatus according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a schematic configuration of a personal computer system in which a waveform data display device according to an embodiment of the present invention is realized.

FIG. 6 is a diagram illustrating a display example of a display screen of a CRT display device in the device according to the embodiment of the present invention.

FIG. 7 is a diagram showing an example of waveform data used in the apparatus according to the embodiment of the present invention.

FIG. 8 is a diagram for explaining a method of processing waveform data for one section when the time axis is reduced and displayed in the apparatus according to the embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of a reduced display of a time axis in the device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CRT display device 2 Personal computer main body device 3 Keyboard 4 Mouse 5 Speaker

Claims (5)

[Claims] 1. A display means for visually displaying on a screen, a storage means for storing a waveform data string in which waveform data representing amplitudes are arranged in time series, and a waveform data string read from the storage means Detecting means for detecting, for each section of a predetermined length, waveform data representative of the characteristic of the waveform of the section from the waveform data string of the section; and a value based on the waveform data detected by the detecting section. And a display control means for controlling the display in a time-series manner for each section and displaying on a screen of the display means. 2. A display means for visually displaying on a screen; a storage means for storing a waveform data string in which waveform data representing the magnitude of amplitude is arranged in time series; and the display based on the waveform data string. Setting means for setting the degree of enlargement or reduction of the time axis of the waveform displayed on the means, and dividing the waveform data string read from the storage means into sections having a length corresponding to the degree of enlargement or reduction set by the setting means Delimiter means, for each section divided by the delimiter means, detection means for detecting waveform data representatively representing the characteristic of the waveform of the section from the waveform data string of the section, setting by the setting means When the degree of enlargement / reduction is larger than the predetermined value, the value based on the waveform data detected by the detection means is displayed by the first display method, and the degree of enlargement / reduction set by the setting means is the predetermined degree. On the smaller side than the value A value based on the waveform data detected by the detection means in Rutoki second
A display control means for controlling display on a screen of the display means in the display method according to the above. 3. A display means for visually displaying on a screen; a storage means for storing a waveform data string in which waveform data representing amplitudes are arranged in time series; and a waveform data string read from the storage means. Detecting means for detecting, for each section having a predetermined length, waveform data having an absolute value of the amplitude of a maximum value or a corresponding value from a waveform data string of the section, and a maximum value of the waveform data detected by the detection means. Or a display control means for controlling the corresponding values to be displayed in a time-series manner for each section on the screen of the display means. 4. A display means for visually displaying on a screen; a storage means for storing a waveform data string in which waveform data representing amplitudes are arranged in time series; a waveform data string read from the storage means. Detecting means for detecting the maximum value or the waveform data of the corresponding value and the minimum value or the corresponding value of the waveform data from the waveform data sequence of the section for each predetermined length of the section; A waveform data display device comprising: display control means for controlling the maximum value or the corresponding value and the minimum value of the detected waveform data or the corresponding value or the corresponding value in a time series for each section to be displayed on a screen of the display means. 5. A display means for visually displaying on a screen; a storage means for storing a waveform data string in which waveform data representing the magnitude of amplitude is arranged in a time series; and a display based on the waveform data string. Setting means for setting the degree of enlargement or reduction of the time axis of the waveform displayed on the means, and dividing the waveform data string read from the storage means into sections having a length corresponding to the degree of enlargement or reduction set by the setting means Separating means; and detecting means for detecting, for each section divided by the dividing means, waveform data having a maximum value or a corresponding value and a minimum value or corresponding waveform data from a waveform data string of the section. When the degree of enlargement / reduction set by the setting means is on the enlargement side from a predetermined value, the maximum value of the waveform data detected by the detection means or its corresponding value is arranged in time series for each section,
When the degree of enlargement or reduction set by the setting means is smaller than a predetermined value, the maximum value of the waveform data detected by the detection means or its corresponding value and the minimum value or the corresponding value are chronologically determined for each section. And a display control means for controlling display on the screen of the display means.