JP3687633B2 - Waveform data display method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waveform display method which is a method for displaying a waveform indicated by waveform data on a monochrome dot matrix display.
[0002]
[Prior art]
Conventionally, a sampler for sampling sound waveform data and using that waveform data to play music, a multitrack recorder for recording sound on multiple tracks and editing it to create a song, etc. In such electronic apparatuses, a waveform indicated by stored waveform data is displayed as a graphic on a display provided in those devices.
[0003]
This is for various editing and settings such as trimming, cutting, copying, pasting, filtering, amplitude control, reading start / end point setting, loop range setting, etc. while viewing the displayed waveform. To be able to do that.
When such display is performed, a cursor for designating a position and range for editing and setting is also displayed at the same time. In other words, the user can specify the position and range to be edited or set by moving the cursor displayed with the waveform to the position where the user wants to specify the waveform or moving the range to be specified. It is.
[0004]
By the way, in the sampler and multitrack recorder described above, a monochrome dot matrix type display is often used because it is inexpensive and easy to control. Here, a conventional display method and problems in such a display will be described. 5 to 7 are diagrams showing display examples when the waveform of the waveform data and the cursor are displayed by the conventional method, but only the vicinity of the intersection of the waveform and the cursor is shown in a simplified manner.
[0005]
Conventionally, when a waveform and a cursor are simultaneously displayed on a monochrome dot matrix type display, as shown in FIG. 5, the waveform 61 and the cursor 71 are displayed as a black (on) dot line, and in the portion A where the two overlap. Then, the dot of that portion was inverted and displayed as a white (off) dot. That is, a waveform bitmap is created based on the waveform data to be displayed, and an exclusive OR with “1” indicating “ON” for each dot in the column corresponding to the position of the cursor in the waveform bitmap ( The waveform bitmap including the cursor is generated as display data by taking (EXOR), and display based on this is performed.
In this way, the waveform can be recognized even at the portion where the waveform 61 and the cursor 71 overlap.
[0006]
[Problems to be solved by the invention]
However, with the conventional display method, when the waveform to be displayed is not an ordinary smooth line waveform, it is an envelope waveform that fills and displays from the maximum value to the minimum value, or a waveform with a special shape. Had a problem that the display was difficult to understand.
[0007]
That is, for example, when the cursor 71 is displayed together with the envelope waveform 62 as shown in FIG. 6, a considerable portion of the cursor is displayed as white dots in a portion with a large amplitude, and the cursor becomes difficult to see. Further, when the cursor 71 is displayed together with the waveform 63 having a very steep peak consisting of one line as shown in FIG. 7, when the peak and the cursor 71 overlap with each other, the portion becomes a white dot, The peak that should be in the portion indicated by B cannot be seen, resulting in an unnatural and unintelligible display.
The present invention solves such a problem, and when displaying a waveform indicated by waveform data on a monochrome dot matrix type display, it can be easily displayed with a cursor so that it can be naturally displayed regardless of the shape of the waveform. The purpose is to do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the waveform data display method of the present invention intends to display a waveform data as a waveform on a dot matrix type display that displays two states corresponding to ON / OFF of dots. Display data creation procedure for creating a waveform bitmap for display with the horizontal axis as sample or time and the vertical axis as amplitude based on the waveform data to be performed, and a cursor position specifying procedure for specifying the cursor position on the horizontal axis, , the columns corresponding to the position of the cursor specified above cursor location determination procedure in the waveform bitmap, as well as changing the dot portion of the off-on dots, a portion of the oN dots in a predetermined off-line pattern The display data changing procedure to be changed and the waveform bitmap changed in the procedure are output to the display unit and the waveform bitmap is output. It is provided with a display data output procedure to perform a display based on the bitmap.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
First, a hard disk recorder will be described with reference to FIGS. 1 and 2 as an example of an apparatus having a monochrome dot matrix type display to which the waveform display method of the present invention is applied. FIG. 1 is a block diagram showing a schematic configuration of the hard disk recorder, and FIG. 2 is a diagram showing a display example of a display provided in the hard disk recorder.
This hard disk recorder is a multi-track recorder for recording input sound as waveform data on a plurality of tracks and editing it to create a song. The waveform input / output unit 11, recorder circuit 12, hard disk 13, control A microcomputer 14, a display 15, and an operator 16 are provided.
[0010]
The waveform input / output unit 11 is an interface for connecting a microphone for inputting an audio signal, a speaker for outputting waveform data as audio, and other devices for inputting / outputting audio signals and waveform data.
The recorder circuit 12 converts various audio signals input from the waveform input / output unit 11 into waveform data in a format suitable for recording on the hard disk 13, and reflects setting and editing results in the waveform data. A circuit that performs processing operations and data processing operations. The recorder circuit 12 also records waveform data to the hard disk 13 and reads waveform data from the hard disk 13.
[0011]
The hard disk 13 is a storage unit that stores audio signals and waveform data input from the waveform input / output unit 11 and data such as editing results thereof.
The control microcomputer 14 is a control unit that performs overall control of the operation of the hard disk recorder, and controls various processes in the recorder circuit 12, display by the display unit 15, and the like in accordance with a user instruction received by the operation unit 16. The control microcomputer 14 includes a ROM that stores a program for performing these control processes and a RAM that is used as a work memory.
[0012]
The display unit 15 is constituted by a liquid crystal display panel which is a monochrome dot matrix type display unit, and displays the operation state and setting of the apparatus, the waveform indicated by the waveform data, and the like according to the display data sent from the control microcomputer 14.
The operation element 16 is composed of various buttons and dials, and is used for receiving instructions and operations from the user. A touch panel may be laminated on the display device 15 and used as the operation element 16.
[0013]
In such a hard disk recorder, the display screen by the display 15 is, for example, as shown in FIG.
(A) is a screen for displaying information of each track. In the recording area display section 30 on the right side of the center, the horizontal axis represents the sample or time, the vertical axis represents the track number, and the area where the waveform data is stored in each track is displayed as a bar with black dots. In addition, a broken-line cursor 81 is also displayed on the recording area display unit 30, and the cursor 81 can be used to designate a portion of the waveform data to be used for waveform display and a playback start position.
[0014]
Further, the track selection marker 21 near the center is a marker indicating which track is selected. In the figure, the 15th track is selected. The track information display unit 22 on the upper left side displays information on the selected track. When the waveform display key 23 is pressed on this screen (including, of course, pressing the enter key by moving the pointer over it or touching the corresponding part of the touch panel), as shown in FIG. The display switches to the correct waveform display screen.
[0015]
On the waveform display screen, the waveform data of the track selected when the waveform display key 23 is pressed is displayed as a waveform on the central waveform display section 40. This display is performed using the position of the cursor 81 displayed on the recording area display unit 30 as a reference, with the horizontal axis as the sample or time, and the vertical axis as the amplitude. The reference line 72 is a line indicating the position of the zero value in the vertical axis direction. The cursor 71 is also displayed on the waveform display section 40, and the initial position in the horizontal axis direction is set to a position corresponding to the sample or time designated by the cursor 81 of the recording area display section 30. Here, since no waveform data is stored at the position of the cursor 81 of the 15th track, the waveform display unit 40 is not displaying a waveform.
The cursor position display unit 25 is a display unit that displays the position of the cursor 71 as a sample number or time in the track. The cursor 71 once displayed is moved by the operation of the operation element 16, and the display of the cursor position display unit 25 is changed accordingly. When the cursor 71 reaches the vicinity of the end of the waveform display section 40, the cursor 71 is not moved any further and the waveform is scrolled.
[0016]
The waveform display unit 40 displays the waveform with the resolution displayed on the vertical resolution display unit 26 and the horizontal resolution display unit 27. The vertical resolution displayed on the vertical resolution display unit 26 indicates the level of amplitude corresponding to one dot in the vertical direction, and can be adjusted with the up and down keys on the left side of the vertical resolution display unit 26. The horizontal resolution displayed on the horizontal resolution display unit 27 indicates how many samples or how many samples the horizontal line corresponds to, and is adjusted by the left and right keys below the horizontal resolution display unit 27. can do.
These resolutions are stored for each track. When the display of the waveform is instructed, the resolution is first set to the stored value. When these resolutions are changed, the waveform and the cursor are redrawn with new resolution so that the current position of the cursor 71 is at the center of the waveform display unit 40.
[0017]
On this waveform display screen, operations such as editing, setting, and marking can be performed while appropriately moving the cursor 71 with the operation element 16 and specifying the target position and range.
When the locate key 28 is pressed, the position of the cursor 81 is moved to a position corresponding to the position of the cursor 71 at that time, and the screen returns to (a). When the exit key 29 is pressed, the screen returns to the screen shown in FIG.
[0018]
On the other hand, when the name setting key 24 is pressed on the screen (a), the screen is switched to a track name setting screen as shown in (c). This screen is a screen for setting the name of the track selected when the name setting key 24 is pressed, and the name can be edited by a name setting window 50 displayed on the right side of the center. When the OK key 51 is pressed after editing, the edited name is set as the name of the track and the screen returns to (a).
This hard disk recorder has various functions other than those described above, and can perform display according to the functions. However, since it is not directly related to the features of the present invention, description thereof will be omitted. .
[0019]
Next, the waveform data display method according to the present invention will be described with reference to FIGS. 3 and 4 by taking as an example processing for displaying the waveform display unit 40 on the display 15 of the hard disk recorder. FIG. 3 is a flowchart showing the processing, and FIG. 4 is a diagram corresponding to FIG. 7 showing a display example when the waveform of the waveform data and the cursor are displayed by the method.
When it is necessary to display waveform data on the waveform display unit 40, the control microcomputer 14 of the hard disk recorder described above executes a predetermined program stored in the ROM and starts the waveform data display process shown in the flowchart of FIG.
[0020]
First, in step S1, a portion of the waveform data corresponding to the range to be displayed is read from the hard disk 13. This range can be determined based on the position of the cursor 81 on the recording area display unit 30 and the lateral resolution specified for the track to be displayed. Reading is performed via the recorder circuit 12 and the read waveform data is stored in the RAM of the control microcomputer 14.
Then, display waveform data is created from the waveform data read in step S2. In this process, the maximum value and the minimum value of the amplitude shown in the vertical axis direction are obtained for each sample to be displayed on one line of the read waveform data in accordance with the horizontal resolution of display (x samples / line). Do by. This means that when x is sufficiently large, positive and negative peak values for each x sample are extracted. The display waveform data is also stored in the RAM of the control microcomputer 14. If the unit of the horizontal axis is time, x is the number of samples corresponding to that time.
[0021]
In the next step S3, a waveform bitmap for display is created from the waveform data for display created in step S2 in accordance with the vertical resolution of display (amplitude y / dot). This process refers to the display waveform data for each vertical line, and the dot corresponding to the value obtained by dividing the maximum value of the amplitude in that line by the value obtained by dividing the minimum value by y. All the dots up to are set to “1” indicating “ON”, and all the remaining dots are set to “0” indicating “OFF”. By this processing, a waveform bitmap in which the dot of the portion where the waveform line passes is “ON” can be created for each line.
By performing this process for all lines, a waveform bitmap that is display data for displaying the waveform indicated by the waveform data as black dots with the horizontal axis as the sample or time and the vertical axis as the amplitude can be created. it can. This waveform becomes a line as shown in FIG. 5 when x is small or the change in amplitude value is gentle, but when x is large or the change in amplitude value is abrupt, The waveform lines are displayed without being sufficiently decomposed, and as a result, an envelope waveform as shown in FIG. 6 is displayed. The processing of these steps S2 and S3 is the display data creation procedure.
[0022]
When the creation of the waveform bitmap is completed, the position of the cursor is specified in step S4. When the waveform display unit 40 is newly displayed, the cursor position is normally set at the center. However, when the vicinity of the start position and the end position of the waveform data are displayed, the cursor position is set with reference to the end of the waveform data. It is good to make it fixed.
In any case, the display position of the cursor may be determined at an appropriate position according to the user's operation. However, the data of the determined position is stored in the RAM of the control microcomputer 14, and the cursor position is referred to this. Should be specified. Here, since the cursor is displayed as a vertical bar whose length is substantially equal to the vertical length of the waveform display unit 40, the position need only be specified in the horizontal axis direction. The process in step S4 is a cursor position specifying procedure.
[0023]
In the next step S5, a process of adding a cursor by changing the dot in the column at the position specified in step S4 of the waveform bitmap created in step S3 is performed. This processing is performed by changing the dot portion of the off together vary on the dot, the portion of the on-dots in the dot of a predetermined off-line pattern. By such processing, each portion where the waveform and the cursor do not overlap can be displayed as a solid line, and the overlapping portion can be displayed as a line of a predetermined pattern.
The process of step S5 is a display data change procedure.
As the predetermined off-line patterns, it can be used, for example "010101". In step S5, if necessary, a process of adding a reference line indicating the position of the zero value in the vertical axis direction is also performed.
[0024]
In step S6, the changed waveform bitmap to which the cursor is added in step S5 is output to the display unit 15 and written to the bitmap register of the display unit 15 to perform display based on the waveform bitmap. Specifically, a dot written with “1” is displayed in black (on), and a dot written with “0” is displayed in white (off). The process of step S6 is a display data output procedure.
Thus, the waveform data display process ends, and the control microcomputer 14 returns to the original process.
[0025]
Although only the display in the waveform display unit 40 has been described here, the display of other parts of the display 15 is also performed by appropriately creating a display bitmap and writing it in the bitmap register of the display 15. To do.
Although the processing for displaying the entire waveform display unit 40 has been described here, when only the cursor 71 is moved without changing the waveform display, the entire waveform display unit 40 does not necessarily need to be rewritten. If the waveform data for display created in step S2 is stored, for example, by using this, the processing of steps S3 to S6 is performed only on the two lines of the movement source and the movement destination of the cursor 71, so that the cursor 71 is changed to another one. The state of moving to the line can be displayed.
[0026]
When the waveform and cursor indicated by the waveform data are displayed on the monochrome dot matrix display by performing the processing as described above, the portions where the waveform and the cursor do not overlap are displayed as solid lines, and the overlapping portion Can be displayed with a predetermined pattern of lines, so it is easy for the viewer to see what the display looked like before the cursor was placed on it, regardless of the shape of the waveform. Understandable. On the other hand, there is no unnatural display. Accordingly, both the waveform indicated by the waveform data and the cursor can be easily displayed and displayed naturally.
That is, for example, even when the conventional EXOR method makes the waveform peak invisible as shown in FIG. 7, when displayed by the above-described method, the overlapping portion of the waveform 63 and the cursor 71 is shown in FIG. It can be displayed with a dotted line, and the shape of the waveform 63 can be displayed naturally and easily.
[0027]
The pattern to be used as the predetermined off-line patterns, not limited to the above-described "010101", the other, for example, "001001001 ..." or even to use a pattern of "0010100101 ...", etc. Good. Further, regardless of the pattern used, the dots at both ends of the parts to be off-line pattern may be turned off (0). That is, for example, when a pattern “010101...” Is applied to an 8-dot portion, “01010100” may be used instead of “01010101”. In this way, the range where the waveform and the cursor overlap can be clearly displayed.
[0028]
Although an example in which the process of adding the cursor is realized as a process by software of the control microcomputer 14 has been described here, this process may be performed as a process by hardware or software provided in the display unit 15. In this case, the control microcomputer 14 sends the waveform bitmap to which the cursor is not added and the cursor position information to the display unit 15, and the display unit 15 receives the received cursor position information for the received waveform bitmap. Display is performed after the cursor writing process similar to step S4 in FIG.
The apparatus to which the waveform data display method described above is applied is not limited to a hard disk recorder, and any apparatus having a monochrome dot matrix type display may be used. For example, it can be applied to a sampler or a waveform measuring instrument.
Further, the display color of the display is not limited to black and white, and any display may be used as long as it can display two states corresponding to dot on / off. The display device itself is not limited to the liquid crystal display panel.
[0029]
【The invention's effect】
As described above, according to the waveform data display method of the present invention, when the waveform and the cursor indicated by the waveform data are displayed on the monochrome dot matrix display, the portions where the waveform and the cursor do not overlap each other are displayed. Since it is displayed with a solid line and the overlapping portion can be displayed with a line of a predetermined pattern, both the waveform indicated by the waveform data and the cursor can be displayed easily and naturally.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a hard disk recorder as an example of an apparatus to which a waveform data display method of the present invention is applied.
FIG. 2 is a diagram showing a display example of a display provided in the hard disk recorder.
FIG. 3 is a flowchart showing display processing of a waveform display section in the hard disk recorder.
FIG. 4 is a diagram showing a display example when the waveform of the waveform data and the cursor are displayed by the waveform data display method of the present invention, and shows only the vicinity of the intersection of the waveform and the cursor.
FIG. 5 is a diagram showing a display example in the case where a waveform and a cursor of waveform data are displayed by a conventional method, in a simplified manner only near the intersection of the waveform and the cursor.
FIG. 6 is a diagram showing another example thereof.
FIG. 7 is a diagram showing still another example thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Waveform input / output part, 12 ... Recorder circuit, 13 ... Hard disk, 14 ... Control microcomputer, 15 ... Display, 16 ... Control, 21 ... Track selection marker, 22 ... Track information display part, 23 ... Waveform display key, 24 ... Name setting key, 25 ... Cursor position display section, 26 ... Vertical resolution display section, 27 ... Horizontal resolution display section, 30 ... Recording area display section, 40 ... Waveform display section, 61, 63 ... Waveform, 62 ... Envelope waveform 71, 81 ... cursor, 72 ... reference line

Claims (1)

A method of displaying waveform data as a waveform on a dot matrix type display that displays two states corresponding to dot on / off ,
Based on the waveform data to be displayed, a display data creation procedure for creating a waveform bitmap for display with the horizontal axis as sample or time and the vertical axis as amplitude,
A cursor position specifying procedure for specifying the position of the cursor on the horizontal axis;
Change above for waveform bitmap the string corresponding to the position of the specified cursor cursor location determination procedure in the, along with changing the dot portion of the off-on dots, a portion of the ON dots in a predetermined off-line pattern Display data change procedure,
A waveform data display method comprising: a display data output procedure for outputting a waveform bitmap changed in the procedure to the display device and performing display based on the waveform bitmap.

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