JP3309346B2 - equalizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equalizer,
In particular, it relates to a graphic equalizer and a parametric equalizer.

[0002]

2. Description of the Related Art A graphic equalizer and a parametric equalizer as described above are used, for example, to improve the frequency characteristics of a sound field for vocalizing an audio signal. The parametric equalizer includes a plurality of variable filters 2, 2,... As shown in FIG. 5, and each filter 2 has a center frequency f, a gain G at this frequency f, a Q at this frequency f (selectivity). ) Are provided respectively with rotary volumes 4f, 4G, 4Q.

In a graphic equalizer, FIG.
Are provided with slide-type volumes 6, 6,... For adjusting a gain for each predetermined frequency in a frequency band from 20 Hz to 16 kHz, for example.

[0004]

In the parametric equalizer, the volume 4f, 4G, 4Q of each filter 2 is used.
When adjusting the parameters, he could not intuitively understand what the current adjustment state was, and required considerable skill to master the parametric equalizer. The graphic equalizer is easier to adjust than the parametric equalizer by looking at the position of each sliding volume 6, but still requires skill.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide an equalizer that allows a set frequency characteristic to be confirmed with the naked eye.

[0006]

Therefore, the present invention comprises a plurality of filter means for filtering and outputting an input signal according to a parameter, an operation window and a frequency characteristic display window, wherein the operation window comprises: A frequency setting area is provided along a direction parallel to the one side, a characteristic setting area at each frequency is provided along a direction perpendicular to the one side, and a parameter representing a parameter of the filter means is provided in the operation window. A display is displayed, and the frequency characteristic display window has a direction parallel to the one side of the operation window as a frequency display axis provided corresponding to each frequency in the frequency setting area, and a direction perpendicular to the frequency axis. Is used as an axis representing the characteristic at each frequency, a display means displaying a frequency characteristic display continuously representing the total frequency characteristic of each filter means, and an operation window. Operating means for designating the position of the parameter display in the frequency setting area and the characteristic setting area, and changing means for changing the frequency characteristic display in accordance with an instruction of the operating means, and changing the parameter display. A parameter deciding means for deciding the parameter in accordance with an operation of the operation means, and a sending means for sending the parameter decided by the parameter deciding means to the filter means.

A plurality of operation displays are displayed in advance in the respective frequency setting areas of the operation window as parameter displays. These operation displays can be moved on the characteristic setting area. The operation display and the frequency characteristic display can be changed in accordance with an instruction from the operation means. The changing means can change the operation display and the frequency characteristic display simultaneously with the operation of the operation means.

In addition, an operation display is displayed as a parameter display so that the frequency setting area and the characteristic setting area of the operation window can be moved, and the changing means operates the operation display and the frequency characteristic display in response to an instruction from the operation means. Can be changed.

[0009]

According to the present invention, the frequency setting area of the operation window is specified by the operating means, and the characteristic area in the specified frequency setting area is specified by the operating means. The displayed frequency characteristics are displayed. Further, in response to the operation of the frequency setting area and the characteristic setting area by the operating means, the parameter determining means determines the parameters of the filter means, and the sending means sends the parameters to the filter means.

In the operation window, an operation display may be displayed in each frequency setting area. In this case, the changing means is operated by operating the characteristic setting area corresponding to each operation display by the operation means. The operation display is moved corresponding to the operated characteristic setting area. Therefore, it can be used as a graphic equalizer.

In some cases, an operation display is displayed on the operation window so that each frequency setting area can be moved. In this case, the frequency setting area is operated by operating means, and further, in the operated frequency setting area, When the characteristic setting area is operated by the operation means, the operation display moves to the operated frequency setting area and characteristic setting area. Therefore, it can be used as a parametric equalizer.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment, as shown in FIG.
A DSP (digital signal processing device) 10 is provided.
A digital audio signal digitized by the A / D converter 12 is supplied to the DSP 10.
The DSP 10 functions as a digital filter whose frequency characteristics are set according to the parameters sent from the CPU 14. The digital signal filtered by the DSP 10 is converted into an analog audio signal by the D / A converter 16 and output.

The CPU 14 has a display unit 16 composed of a CRT or an LCD. The display section 16 displays D
Mode for setting the characteristics of SP10 (Edit mode)
At this time, a screen as shown in FIG. 1B is displayed according to an instruction from the CPU 14. On this screen, the operation window 1
8 and a frequency characteristic display window 20 are displayed.

In the operation window 18, a plurality of slide-type volumes 22 are displayed. These volumes 22
For example, from 20Hz to 16k, which is predetermined along the horizontal direction
It is displayed at positions corresponding to various frequencies up to Hz. Each of these slide-type volumes 22 has a knob 24, and these knobs 24 are connected to an operation unit 3 described later.
By the operation from 1, it moves in the vertical direction.

When the knob 24 is located at a certain reference position, for example, at a middle point in the vertical direction, the slide volume 22
Represents that the gain at the frequency corresponding to is 0 dB,
If it is above the midpoint, the gain at that frequency is
This means that the gain is increased in proportion to the moving distance from the intermediate point (a positive value dB). When the distance is lower than the intermediate point, the gain at the above frequency is attenuated in proportion to the distance from the intermediate point. (Negative value dB).

In the frequency characteristic display window 20, a frequency axis 24 is displayed in the center in the horizontal direction. This frequency axis 2
4, each sliding volume 22 of the operation window 18
Corresponds to the frequency assigned to each slide-type volume 22. A gain axis 26 extends along the vertical direction at the left end of the frequency characteristic display window 20.
Is displayed. The frequency characteristic display window 20
Shows a frequency vs. gain characteristic determined by the operation position of the knob 24 of each slide volume 22.

For example, in FIG. 1B, the knob 24 of the slide volume 22 corresponding to 25 Hz is located at the top, and the knob 24 of the slide volume 22 corresponding to 40 Hz is located slightly below the middle point. Therefore, the frequency vs. gain characteristic diagram has a large peak at 25 Hz,
It is displayed as a characteristic having a small valley at Hz. Further, the frequency vs. gain characteristic diagram is displayed on the knob 2 by the operation unit 31.
When 4 is moved, it changes simultaneously.

A Q setting window 30 is also displayed on the left side of the operation window 18. Each time the setting window 30 is operated by the operation unit 31, the Q value is set to 3, 5, 7, for example. And so on. The steepness of the peaks and valleys of the frequency versus gain characteristic diagram displayed on the frequency characteristic diagram changes according to the Q value.

The CPU 14 has an operation unit 31 as described above.
Also have. As the operation unit 31, for example, a keyboard or a mouse is used.

The operation of such an equalizer will be described with reference to the flowchart shown in FIG. First, when entering the edit mode, it is determined whether a key or a mouse on the keyboard has been operated (step S2). If not, step S2 is repeated until it is operated. If so, it is determined whether the operation is frequency or Q (step S4). That is, it is determined whether the operated portion is any of the knobs 24 in the operation window 18 or the Q setting window 30.

For example, when the knob 24 is operated (for example, when this operation is performed with a mouse, the knob 2 of the slide type volume 22 of the frequency whose gain is to be adjusted is adjusted).
4 by clicking the mouse on it and ending by moving the mouse up or down until the desired gain is reached while clicking, and releasing the click when the desired gain is reached. ), The frequency and the gain are determined according to the operation of the key or the mouse (step S).
6). That is, the frequency at which the gain is changed is determined depending on which frequency each knob 24 belongs to. Then, the gain is determined based on how much the mouse has changed from the midpoint.

Next, the display of the operation window 18 and the characteristic window 20 is changed according to the determined frequency and gain (step S8). Then, it is determined whether the operation is completed (Step S)
10). That is, in the case of the mouse, it is determined whether or not the click is released. If not, the process returns to step S2. Therefore, in the case of a mouse,
It appears that the movement of the knob 24 and the change of the display of the frequency versus gain characteristic are performed substantially simultaneously with the movement of the mouse.

When Q is operated in step S4, Q is determined according to the operation of the key or the mouse (step S12). For example, when the Q operation window 30 is operated by the mouse, the Q value changes from a predetermined value, for example, 3 to 5, instead of 3. The operation window 18 and the frequency characteristic display window 20 are displayed according to the determined Q value.
It is changed by step S8.

For example, the value of the Q operation window 30 is changed from 3 to 5, and the steepness of the peaks and valleys of the frequency vs. gain characteristic diagram displayed on the frequency characteristic display window 20 accordingly. Changes. Then, in step S10, it is determined whether the operation is an end operation. For example, in the case of a mouse, it is determined whether a double click has been performed. If not an end operation, step S
Return to 2. Therefore, when the Q operation window 30 is further operated,
Similarly to the above, the Q value changes from 5 to 7, and the steepness of the peak or valley in the frequency vs. gain characteristic diagram changes.

If it is determined in step S10 that the operation is a termination operation, the timer built in the CPU is reset and a new count is started (step S14). Then, it is determined whether a key or a mouse has been operated (step S16). If the operation is performed here, it is determined that there is still a change in the frequency characteristic, and the steps from step S4 are executed again to change the characteristic setting. Therefore, various gains can be set in various frequency bands.

Next, it is determined whether the timer time has expired (step S18).
Return to 16. That is, if there is no change in the setting within a predetermined time after the setting of the characteristic, it is determined that the setting has been determined.

In step S18, when it is determined that the timer time has expired, that is, when it is determined that the setting has been determined, the gains at various frequencies determined by operating the operation unit 31 such as the mouse above. DSP10 as a filter having these characteristics based on the
Are determined (step S2).
0). Then, this is transmitted to the DSP 10 (step S22). Next, it is determined whether or not the edit mode has ended (step S24). If not, the process returns to step S2, and if so, the edit mode ends.

As described above, in the first embodiment, the frequency characteristics at various frequencies can be set in the same manner as in a normal graphic equalizer, and the set frequency characteristics are displayed on the frequency characteristic display window 20 simultaneously with the setting. Is done.

FIGS. 3 and 4 show a second embodiment. This embodiment corresponds to a parametric equalizer, and includes a DSP 10, an A / D converter 12, a D / A converter 16, a CPU 14, a display unit 16, and an operation unit 31, as in the first embodiment. ing. However, the display displayed on the display unit 16 is different from that of the first embodiment.

That is, as shown in FIG. 3, an operation window 18a and a frequency characteristic display window 20 are displayed on the display unit 16. The frequency characteristic display window 20 is the same as the frequency characteristic display window 20 of the first embodiment, but the operation window 18a differs from the operation window 18 of the first embodiment in that one slide volume 32 is displayed in advance. ing. The slide volume 32 has a knob 34 and a groove 36 in which the knob 34 slides. Above the groove 36, a frequency window 38 for displaying the frequency at which the slide volume 32 is located is provided.
Is displayed on the right side of the frequency window 38.
0U and 40D are displayed.

For example, when the user clicks the groove 36 with a mouse and moves the same horizontally, the entire display of the slide volume 32 moves. The frequency window 38 displays the frequency at which the display of the slide volume 32 is located. Is displayed. Then, after moving these displays until the desired frequency is reached (after releasing the click), clicking the knob 34 and moving it upward or downward sets the gain at that frequency. .
At this time, a peak or a valley is displayed in the frequency characteristic display window 20 according to the gain at that frequency.

Each time the Q setting window 40U or 40D is clicked, the Q value increases or decreases, and the steepness of the peak or valley of the frequency-gain characteristic corresponding to the slide volume changes accordingly. That is, in this embodiment, the Q value is set for each peak or valley.

As described above, the frequency characteristics can be set by moving the display of the slide volume or the like to various desired frequencies and setting the gain and the Q value.

FIG. 4 is a flowchart showing the operation of the equalizer for making the above setting. First, when the mode is set to the edit mode, it is determined whether a key or a mouse is operated as in the flowchart of FIG. 2 (step S2). When a key or mouse is operated,
It is determined whether the operation is frequency, gain, or Q (step S4a).

If the frequency is determined, that is, if the groove 36 of the slide volume is clicked with, for example, a mouse, the frequency is determined according to the operation (step S26). That is, it is determined how much the groove 36 has been clicked and moved in the horizontal direction from the reference position.
Then, the display of the operation window 18a and the frequency characteristic display window 20 is changed (step S8).

That is, the slide volume and the like in the operation window 18a are moved and displayed by the determined amount, and the gain according to the position of the knob 34 at that time, the Q at that time
Displays the frequency characteristic according to the value. Then, it is determined whether the operation is a termination operation (step S10). In this case, it is determined whether the clicked state has been released.

If it is not an end operation, the steps from step S2 are executed. Therefore, if the mouse operation is continued without releasing the click, the movement of the slide volume 32 is also continued.

If the knob 34 is clicked, it is determined in step S4a that the gain has been changed, and the gain according to the operation is determined (step S28). That is, by clicking the knob 34 and moving the mouse upward or downward, the gain of the frequency at which the knob 34 is located is determined according to the movement. Then, step S8 is executed, and the display of the knob 34 also moves upward or downward,
Further, peaks or valleys are also formed in the frequency characteristic display section 20.

Next, in step S10, it is determined whether the operation is an end operation. That is, it is determined whether or not the clicked state has been released, and if not, the steps after step S2 are executed again. Therefore, until the click state is released, the display of the knob 34 moves with the mouse, and the peak or valley of the frequency characteristic also moves with the mouse.

When the user clicks on the Q operation window 40U or 40D, it is determined in step S4a that the Q is set, and the Q is determined according to the operation (step S30). That is, when the Q operation window 40U is clicked, the Q value increases by a predetermined value, and conversely, when the Q operation window 40D is clicked, the Q value decreases by a predetermined value.

In response to this, in step S8, the Q operation window 40 is displayed on the frequency characteristic display window 20.
U and 40D change the steepness of the peak or valley having the corresponding frequency as the peak according to the determined Q value. And
It is determined in step S10 whether the operation is a termination operation. In this case, for example, it is determined whether the mouse has been double-clicked. If it is not a termination operation, the steps after step S2 are executed again. Therefore, each time the Q operation windows 40U and 40D are clicked, the Q value is changed, and the steepness of the corresponding frequency-gain characteristic also changes accordingly.

The processing after the end operation is the first processing shown in FIG.
Since the processing is the same as that of the embodiment, detailed description is omitted.

In the above two embodiments, the frequency characteristic display window 2
Although only the frequency-gain characteristic is displayed at 0, the frequency-phase characteristic may be displayed instead of or in addition to this.

[0044]

As described above, in the equalizer according to the present invention, the parameters of each filter are determined by operating the frequency setting area and the frequency characteristic setting area of the operation window, and the total frequency characteristic of each filter is determined by the frequency. Since it is displayed in the characteristic setting window, it is possible to intuitively understand what frequency characteristics are being set. Therefore, even if a person who is not familiar with such adjustment of the equalizer performs the adjustment, it can be set so that a desired frequency characteristic can be easily obtained. Furthermore, since parameter display is provided in each frequency setting area of the operation window,
The setting can be performed by the same operation as the equalizer of the conventional analog device. Moreover, in the equalizer according to the present invention, when the parameters of each filter are set, the total frequency characteristic of each filter is displayed in the frequency characteristic display window substantially simultaneously, so that it is possible to quickly determine how the frequency characteristic has been set. You can know. In addition, when the parameter display is displayed corresponding to a predetermined setting area, the adjustment can be performed with a feeling similar to that of the conventional graphic equalizer, so that a person who is familiar with the conventional graphic equalizer can easily set the parameter. Yes, and you can know the overall frequency characteristics. When the frequency setting area and the characteristic setting area of the operation window are set together with the movement of the operation display, fine frequency setting can be performed similarly to the case of the parametric equalizer.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of an equalizer according to the present invention and a diagram showing a display screen of a display unit of the first embodiment.

FIG. 2 is a flowchart of the first embodiment.

FIG. 3 is a diagram showing a display screen of a display unit according to the second embodiment.

FIG. 4 is a flowchart of the second embodiment.

FIG. 5 is a front view of a conventional parametric equalizer.

FIG. 6 is a front view of a conventional graphic equalizer.

[Explanation of symbols]

Reference Signs List 10 DSP (filter means) 14 CPU (change means, parameter determining means, sending means) 16 Display section (display means) 18 18a Operation window 20 Frequency characteristic display window 24 Knob section (operation display) 31 Operation section (operation means) 32 Slide volume display (operation display)

Continuation of the front page (56) References JP-A-3-258110 (JP, A) JP-A-3-240307 (JP, A) JP-A-2-117202 (JP, A) JP-A-1-143516 (JP) , A) Japanese Utility Model 2-107077 (JP, U) Japanese Utility Model 5-7767 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H03G 5/00-5/28

Claims (4)

(57) [Claims] 1. An image processing apparatus comprising: a plurality of filter means for filtering an input signal in accordance with a parameter and outputting the filtered signal; an operation window and a frequency characteristic display window; Is provided, a setting region of the characteristic at each frequency is provided along a direction perpendicular to the one side, a parameter display representing the parameter of the filter means is displayed in the operation window,
The frequency characteristic display window is a frequency display axis provided corresponding to each frequency of the frequency setting region in a direction parallel to the one side of the operation window, a direction perpendicular to the frequency axis in each of the frequencies. Display means for displaying, as axes representing the characteristics, a frequency characteristic display continuously representing the total frequency characteristic of each of the filter means; and, in the operation window, a frequency setting area for the parameter display and the characteristic setting area. Operating means for designating the position in, and changing means for changing the frequency characteristic display and the parameter display in accordance with the instruction of the operating means; and parameter determining means for determining the parameter in accordance with the operation of the operating means Transmitting means for transmitting the parameter determined by the parameter determining means to the filter means. Riser. 2. The equalizer according to claim 1, wherein a plurality of operation displays are displayed in advance in said frequency setting areas of said operation window as said parameter displays, and these operation displays can be moved on said characteristic setting area. Wherein the changing means changes the operation display and the frequency characteristic display in accordance with an instruction from the operation means. 3. An equalizer according to claim 1, wherein said changing means changes said frequency characteristic display substantially simultaneously with an operation of said operating means. 4. The equalizer according to claim 1, wherein an operation display is displayed as the parameter display so that a frequency setting area and a characteristic setting area of the operation window can be moved, and the changing means responds to an instruction from the operation means. An equalizer for changing the operation display and the frequency characteristic display.