JPH0715264A - Signal processor - Google Patents

Abstract

PURPOSE:To facilitate the setting of a parameter to each digital filter and to display the frequency characteristics of all the filters provided by the setting. CONSTITUTION:On a table 24 for setting which arranges in a line and displays set value display areas 30, 34, 38 and 42 of the kinds of filters and characteristics corresponding to their kinds for each of digital filters 12a-12h, the kind of the filter and a characteristic value corresponding to this kind are displayed in the display areas 30, 34, 38 and 42 by operating an operation part 46. At the same time, a frequency characteristic figure corresponding to the displayed value is displayed at a frequency characteristic display window 48. A CPU 18 decides the parameters to be supplied to the filters 12a-12h corresponding to the respective displayed values and transmits them to the filters 12a-12h. When the display area 30 for the kind of the filter is operated by the operation part 46, various filter kind names are displayed at a display window 47 and among these filter kind names, any arbitrary one is displayed in the display area 30 by operating the operation part 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing device,
In particular, it relates to one using a plurality of digital filters.

[0002]

2. Description of the Related Art Conventionally, as the above signal processing device, for example, a digital signal processing device such as DSP is used.
There are implementations of multiple digital filters. The setting of parameters for operating the DSP or the like, for example, the setting for realizing a plurality of filter functions having different cutoff frequencies and gains at the cutoff frequencies, is set by DS.
This is done by operating a volume or a switch displayed on a screen prepared for each filter on a display screen of a controller such as a personal computer provided for setting P and the like.

[0003]

In such a signal processing device, various functions can be flexibly provided to the signal processing device by software, but in order to set parameters, it is prepared for each filter. It is necessary to display the setting screen and operate the volume etc. on that screen, and the task of switching the screen and operating the volume etc. on this switched screen is quite troublesome was there. The characteristics of each filter are
Although it can be recognized by each display screen, there is also a problem that it is difficult to understand at a glance what kind of characteristics the filter has as a whole.

[0004]

The present invention has been made to solve the above-mentioned problems, and has a plurality of filter means. These filter means function as various types of filters according to the setting of parameters. A filter setting display means is also provided.
The filter setting display means displays, for each of the filters, an area for displaying the setting value of the type of the filter and a display area for displaying the setting value of the characteristic according to the type in a line. . These filter type display areas and characteristic setting value display areas are provided with operation means for displaying the types of arbitrary filters and the characteristics according to the types of the filters. Also, parameter determining means for determining the parameters to be supplied to the filter means in accordance with the type of filter and the filter frequency displayed in each setting area, and the parameters determined by the parameter determining means are used for the filter means. Transmission means are also provided for transmitting to.

Further, means for displaying various filter type names on the filter setting display means in response to the operation of the filter type set value display area by the operating means, and the displayed filter type name. It is also possible to provide means for displaying any one of them in the set value display area of the operated filter type. further,
It is also possible to provide frequency characteristic display means for displaying a frequency characteristic diagram of each filter based on the type of the filter displayed in each setting area and the characteristic according to the type.

[0006]

According to the present invention, of the filter type display area and the characteristic set value display area displayed on the filter setting display means, the one corresponding to a specific filter is selected by operating the operation means. By displaying the type of the filter and its characteristics, the parameter to be supplied to each filter means is determined and transmitted to each filter means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention has a DSP 10 as shown in FIG. This DSP 10 has eight cascaded digital filters 1 as shown by broken lines.
It functions as 2a to 12h. This DSP
10 includes an analog audio signal A / D converter 14
The digital audio signal converted by is supplied, and this digital audio signal is supplied to each filter 12a.
The signals are sequentially filtered at 10 to 12h and supplied to the D / A converter 16, where they are again converted into analog audio signals and output.

Each of the digital filters 12a to 12h
Is a type of low-pass filter, high-pass filter, notch filter, etc., a cut-off frequency in each filter, a filter frequency such as a center frequency, and a transition region changing from a pass band to a stop band in accordance with a parameter given from the CPU 18. The characteristics, such as Q, are set.

The CPU 18 has a display section 20 composed of, for example, a CRT or LCD, and the display section 20 is
As shown in FIG. 1B, a filter setting display window 22 is displayed in the upper half of the display screen. This display window 2
2 shows a filter setting table 24 having a total of 32 cells in 4 columns and 8 rows.

Each row of the table 24 corresponds to each of the filters 12a to 12h, and a number display column 26 from 1 to 8 is displayed at the left end of each row in correspondence with each of the filters 12a to 12h. ing. A blank column 28 is displayed on the left side of each number display column 26.

The leftmost column of the setting table 24 is the filter 12
Function display column 3 for displaying the functions of a to 12h, that is, the type names of filters such as low-pass filter and high-pass filter
0, and at the top of the column, a cell 32 represented by "Function" indicating that the column 30 is a function display column is displayed.

The column on the right side of the function display column 30 is for displaying the value of the filter frequency of each of the filters 12a to 12h (eg cutoff frequency in the case of a low pass filter or high pass filter, notch frequency in the case of a notch filter). It is the frequency display column 34 of. Then, at the top of the frequency display column 34, a cell 36 represented by “Frequency” indicating that it is a frequency display column is displayed.

The column on the right side of the frequency display column 34 is a level / display for displaying the level or the gradient value at the frequency previously set in each of the filters 12a to 12h.
It is a slope display row 38. At the top of this row 38, "L" indicating that it is a level / slope display row
A cell 40 represented by "ever / Slope" is displayed.

Further, the column on the right side of the level / slope display column 38 is a Q display column 42 for displaying the Q value in each of the filters 12a to 12h. At the uppermost portion 44 of this column 42, a cell 46 represented by “Q” indicating that it is a Q display column is displayed.

The CPU 18 is also provided with an operating unit 46 including, for example, a keyboard and a mouse. In response to an operation of the operating unit 46, a filter is assigned to each cell of the row corresponding to each filter of the setting display table 24. Type, filter frequency,
Level / slope and Q are displayed.

When any one of the cells 32 in the function display column 30 is clicked by the operation unit 46, for example, the mouse, the filters 12a to 12 are displayed on the right side of the table 24.
A filter type name display window 47 displaying the types of filters that can be set for h is displayed.

"THRU" displayed in the filter type name display window 46 indicates that a digital signal is allowed to pass without being used as a filter, and "THRU" is displayed.
“F” is a low-pass filter, “HPF” is a high-pass filter, “APF” is an all-pass filter, and “Hi”
“BOOST” is a high boost filter (a filter that emphasizes only high frequencies), “Hi ATT” is a high attenuation filter (a filter that attenuates only high frequencies), and “Lo BOOST” is a low boost filter (only low frequencies). (Emphasize filter) to “Lo
"ATT" is a low attenuation filter (a filter that attenuates only low frequencies), "NOTCH" is a notch filter, and "PEQ" is a parametric equalizer.
Each means.

A frequency characteristic display window 48 is displayed below the filter setting display window 22. At the center of the frequency characteristic display window 48 in the vertical direction, a frequency axis 50 is displayed along the horizontal direction.
A gain axis 52 is displayed along the vertical direction at the left end of the. Further, the phase axis 54 is displayed along the vertical direction at the right end. The frequency characteristic display window 48 displays the frequency characteristic according to the type, frequency, level / slope, and Q of the filter set corresponding to each filter 12a to 12h in the filter setting table 24.

The operation of setting the characteristics of each filter in such an equalizer will be described with reference to the flowcharts shown in FIGS. When the mode for setting the characteristics of each filter is entered, a screen as shown in FIG.
(However, in this case, the filter type name display window 47 is not displayed yet).

In this state, as shown in FIG. 2, it is judged whether or not the operation section 46 has been operated (step S2). If it has not been operated, this step S2 is repeated. If it is operated, it is determined whether this operation has operated any cell of each filter row (step S4). If it is not the operation of the cell of the filter row, the process returns to step S2. If it is the operation of the cell of the filter row, the filter row to which the operated cell belongs is stored (step S6).

Then, it is determined which column cell of that row is the operation (step S8). if,
If the operated cell is the cell of the function display column 30, the filter type name display window 47 is displayed (step S10). Then, it is determined whether any one of the filter type names in the window 47 is operated by the operation unit 46 (step S12),
If not, the process returns to step S10. If the filter type name is operated, the type name is set in step S6.
It is stored as the function of the filter corresponding to the filter row stored in step S14.

When it is determined in step S8 that the operated cell is the cell of the frequency display column 34, it is determined whether the operation unit 46 is newly operated for setting the frequency in the cell of the display column 34. (Step S16). If it is not operated, the process returns to step S16, and if it is operated,
The value set by the operation is stored as the frequency of the filter corresponding to the filter row stored in step S6. (Step S18).

The level / slope display row 3 is operated.
If it is determined in step S8 that the cell is the cell No. 8, it is determined whether or not an operation for setting the level / slope is performed on the cell in the display row 38 (step S20).
If no operation has been performed, step S20 is repeated.
If an operation is being performed, the operated value is displayed in step S
The level / slope of the filter corresponding to the filter row stored in 6 is stored (step S22).

When the operated cell is the cell in the Q column 42,
If the determination is made in step S8, it is determined whether or not an operation is performed to set the Q value in the cell of the Q column 42 (step S24). If the operation is not performed, step S24 is repeated. When the operation is performed, the set numerical value is stored as the Q value of the filter row stored in step S6 (step S26).

When it is determined in step S8 that the operated cell is the cell of the number display column 26, the type of filter predetermined for the filter corresponding to the filter row stored in step S6. , The use of default values such as frequency is stored (step S28).

When it is determined in step S8 that the operated cell is a cell in the blank column 28, the filter stores only the signal passing, and the bypass processing without filtering. (Step S3
0).

Following step S14, 18, 22, 26 or 28, as shown in FIG.
Based on the stored value in 8, 22, 26 or 28, a numerical value or the like is displayed in the corresponding cell, and at the same time, the frequency characteristic is displayed in the frequency characteristic setting window 48 (step S32).

The blank column 28 or the number display column 26
When the cell of is operated, the color of the cell is changed. Further, both the frequency vs. gain characteristics and the frequency vs. phase characteristics can be displayed on the frequency characteristic setting window 48 at the same time, or one frequency characteristic can be changed to another frequency characteristic by operating the operation unit 46. You can also switch.

Then, it is judged whether or not the ending operation, for example, the double clicking of the mouse which is the operation unit 46 is performed (step S34), and if the ending operation is not performed, the process returns to step S2. Therefore, until the end operation is performed, the settings are sequentially performed for each cell, the set values such as the function and frequency for each filter 12a to 12h are displayed, and the frequency characteristics of these filters are displayed. To be done.

When the ending operation is performed, the timer is reset and the timer is started (step S36).
Then, it is determined whether the cell of any of the filter rows is operated by the operation unit 46 (step S38), and if it is operated, step S6 and the subsequent steps are performed again, and the setting is performed again.

If the cell of any of the filter rows has not been operated, it is judged whether or not a predetermined timer time has expired (step S40), and if it has not elapsed, step S40.
Return to 38.

When the timer time has expired, steps S14, S18, S2 and S12 are performed for each of the filters 12a-12h.
Parameter data to be supplied to each filter is determined based on the settings set in 2, 26, 28 and 30 (step S42). And this data is DSP1
0 is transmitted (step S44). Following this, the operation unit 46 determines whether or not an operation for ending this setting mode is being performed (step S4).
6) If the mode end operation is not performed, step S
Returning to step 2, if the mode end operation is performed, this mode is ended.

The Q value does not have to be set for all filter types, but may be set only for the low-pass filter, high-pass filter, all-pass filter, notch filter and parametric equalizer. Further, the frequency characteristic is set in the frequency characteristic setting window 48 when the function / filter frequency of the filter is set and then the level / slope or the Q value is set.

In the above embodiment, the DSP 10
Although the two digital filters 12a to 12h are realized, the number thereof can be changed arbitrarily. Also,
When a large number of digital filters are realized and the characteristics of all the filters cannot be displayed simultaneously on the filter setting table 24, the setting table 24 may be scrolled in the vertical direction.

In the above embodiment, the digital filters 12a to 12h are connected in cascade, but they may be connected in parallel. Further, the function of the filter to be used can also be realized by the DSP other than those described above.

[0036]

As described above, according to the present invention, the filter type setting display area and the set value display area of the characteristic corresponding to the type are arranged in a line for one filter means. Is displayed for each filter means, and the type of an arbitrary filter and the characteristics corresponding to the type of the filter are displayed in each set value display area by operating the operating means. Setting can be done easily because it can be done on one display means. Further, since the filter type can be set by selecting from various displayed filter type names, the setting operation can be further facilitated. Further, since the frequency characteristic diagram corresponding to the set value set in this way is displayed, it is possible to recognize at a glance what frequency characteristic is obtained by all the filter means. , The whole picture of this signal processing device can be easily understood.

[Brief description of drawings]

FIG. 1 is an overall block diagram of an embodiment of a signal processing device according to the present invention and an enlarged view of a display unit.

FIG. 2 is a diagram showing a part of a flowchart of the embodiment.

FIG. 3 is a diagram showing the remaining part of the flowchart of the embodiment.

[Explanation of symbols]

10 DSP (filter means) 18 CPU (parameter determination means, transmission means) 20 Display section (file setting display means, frequency characteristic display means) 46 Operation section (operation means)

Claims (3)

[Claims] 1. A plurality of filter means functioning as various types of filters according to parameter settings, and a set value display area of a filter type and a characteristic corresponding to the type are arranged in a line for each filter means. The filter setting display means being displayed, an operating means for displaying an arbitrary filter type and a characteristic value corresponding to the filter type in each of the set value display areas, and the filter displayed in each of the setting areas. Parameter determining means for determining the parameters to be supplied to the respective filter means in accordance with the type and the set value of the characteristic value, and transmitting means for transmitting the parameters determined by the parameter determining means to the filter means. , A signal processing device provided. 2. The signal processing device according to claim 1, wherein
Means for displaying various filter type names on the filter setting display means in response to the operation of the filter type setting value display area by the operating means, and any one of the displayed filter type names Is displayed in the set value display area of the operated filter type. 3. The signal processing device according to claim 1, wherein the frequency characteristic display means displays a frequency characteristic diagram based on the type of filter displayed in each of the setting areas and the characteristic value according to the type. A signal processing device comprising: