JP4088365B2 - Effect device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an effect device provided with mixing means for mixing an audio signal with an effect and an audio signal without an effect.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an effect is imparted to an input audio signal, and an effective presentation is performed by mixing the signal with the effect and the input audio signal before the effect is applied.
FIG. 9 is a diagram showing a configuration of an effect device provided with such a mixing means.
[0003]
The input audio signal IN is input to the effector 10 and an effect is imparted by the effector 10, and the audio signal to which the effect is imparted (hereinafter referred to as “sound effect”) is input to the fader 20 from the terminal A. At the same time, the input audio signal IN is directly input from the terminal B to the fader 20. Here, the input audio signal itself is referred to as “original sound”. The fader 20 has a function of mixing two signals input from the two terminals A and B at a mixing ratio according to the operation position of the operation element. Here, the sound effect input from the terminal A and the terminal The original sound input from B is mixed at a mixing ratio corresponding to the operation position and output as an output audio signal OUT. In this case, the sound effect and the original sound can be mixed at an arbitrary mixing ratio between the sound effect 100% and the original sound 100%.
[0004]
Here, it is considered that an effect is given only to a signal component of a specific frequency band in the input audio signal. Here, a case where an effect is imparted to a high frequency component is taken as an example.
FIG. 10 is a diagram showing the configuration of the effect device configured as described above.
Compared with the effect device shown in FIG. 9, a high-pass filter 30 that extracts only a predetermined high-frequency component from the original sound is provided upstream of the effector 10. In this case, the sound effect input to the terminal A of the fader 20 is a signal in which only the high frequency component is extracted from the original sound and the effect is given to the extracted high frequency component.
[0005]
[Problems to be solved by the invention]
However, in the case of the configuration shown in FIG. 10, when attention is paid to the high frequency component, the sound effect is a signal from which the high frequency component is extracted, and the high frequency component is also included in the original sound. When it increases, there is a problem that the high frequency component of the original sound and the sound effect interfere with each other, and the effect imparted by the effector 10 is weakened.
[0006]
FIG. 11 is a diagram showing the configuration of an effect device that has solved this problem.
The difference between the effect device shown in FIG. 11 and the effect device shown in FIG. 10 is that a low-pass filter 40 is arranged on the terminal B side of the fader 20. The low-pass filter 40 is a filter that cuts the original high-frequency component extracted by the high-pass filter 30 and extracts the low-frequency component of the original sound. At this time, not the original sound but a signal in which the frequency characteristic of the original sound is changed is input to the terminal B of the fader 20. Hereinafter, in general, a signal that is input to the terminal B of the fader 20 and whose frequency characteristic of the original sound has changed but that has not passed through the effector 10 is referred to as “non-effect sound”.
[0007]
According to the configuration of FIG. 11, the sound effect input from the terminal A to the fader 20 is a signal obtained by extracting the high frequency component of the original sound, whereas the non-effect sound input from the terminal B to the fader 20 is the original sound. Therefore, even if these sound effects and non-sound effects are mixed, the above-mentioned interference does not occur. Therefore, the signals are added to the sound effects by mixing these signals. It is prevented that the effect is weakened.
[0008]
However, in the configuration of FIG. 11, it is possible to mix sound effects and non-sound effects at an arbitrary mixing ratio. For example, by reducing the mixing ratio of sound effects, only non-sound effects are output. However, the non-effect sound is a signal in which the high-frequency component of the original sound is cut, and another problem is that the original sound cannot be faithfully output regardless of the mixing ratio of the effect sound and the non-effect sound. Will result.
[0009]
In view of the above circumstances, an object of the present invention is to provide an effect device capable of preventing the occurrence of interference that weakens the applied effect and faithfully outputting the original sound.
[0010]
[Means for Solving the Problems]
The effect device of the present invention that achieves the above object provides:
An effect applying means for applying an effect to the input audio signal and outputting an effect applying signal;
A frequency characteristic adjusting means for adjusting the frequency characteristic of the input audio signal so as to freely change and outputting a characteristic adjustment signal;
Both the effect imparting signal obtained by the effect imparting means and the characteristic adjustment signal obtained by the frequency characteristic adjusting means are input, and the input effect imparting signal and the characteristic adjustment signal are adjusted to a predetermined adjustable mixing ratio. And a signal mixing means for changing the level of change of the frequency characteristic of the input audio signal by the frequency characteristic adjusting means according to the mixing ratio.
[0011]
Here, in the effect device of the present invention described above, the signal mixing means causes the frequency characteristic adjustment signal to have a frequency characteristic close to the frequency characteristic of the input audio signal as the mixing ratio of the characteristic adjustment signal increases. As obtained, it is preferable to change the change level of the frequency characteristic of the input audio signal by the frequency characteristic adjusting means.
[0012]
In the effect device of the present invention described above, the frequency characteristic adjusting means may obtain the characteristic adjustment signal by changing the level of the signal component of the predetermined frequency band of the input audio signal in a changeable manner.
In this case, for example, the effect applying means obtains an effect applying signal by extracting a signal component in a predetermined frequency band from the input audio signal and applying the effect to the extracted signal component, and adjusts the frequency characteristics. The means may obtain a characteristic adjustment signal by variably changing the level of the predetermined frequency component of the input audio signal.
[0013]
In the effect device of the present invention, the frequency characteristic adjusting means includes a filter in which the extracted frequency band is adjusted so as to be changeable, and the filter extracts a signal component of a predetermined frequency band from the input audio signal. Thus, it is also a preferred form to obtain a characteristic adjustment signal.
In this case, for example, the effect applying means obtains an effect applying signal by extracting a signal component of a predetermined frequency band from the input audio signal and applying the effect to the extracted signal component, and the frequency characteristic adjusting means The filter provided in may be such that the cut-off frequency is freely adjustable within the predetermined frequency band.
[0014]
Since the effect device of the present invention includes the frequency characteristic adjusting means, the characteristic adjusting signal in which the signal component in the frequency band to which the effect is imparted by the effect imparting means is removed or reduced can be generated. Is prevented or reduced. Further, the signal mixing means of the effect device of the present invention not only mixes the effect applying signal (sound effect) and the characteristic adjustment signal (non-effect sound) at an adjustable mixing ratio, but also the input sound by the frequency characteristic adjusting means Since the change level of the frequency characteristic of the signal (original sound) is changed, the frequency characteristic of the non-effect sound is made closer to the original sound as the non-effect sound mixing ratio increases, and the mixing ratio of the non-effect sound is 100%. Therefore, the original sound itself can be obtained, so that an output faithful to the original sound can be obtained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a block diagram of a first embodiment of the effect device of the present invention.
The high-pass filter 30 is a filter that extracts a high-frequency component having a frequency F0 or higher from the input audio signal IN (original sound), and the low-pass filter 40 is a filter that extracts a low-frequency component having a frequency F0 or lower from the original sound.
[0016]
A signal that has passed through the high-pass filter 30 is input to the effector 10. The effector 10 gives an effect to the input audio signal and outputs it. This output (sound effect) is input from the terminal A to the fader 20.
The output of the high pass filter 30 is also input to the level adjuster 50. This level adjuster 50 attenuates the level of the input audio signal within a range of 0.0 to 1.0 times and outputs it. The output of the level adjuster 50, that is, the high frequency component of the original sound frequency F0 or higher is output from the low pass filter 40 in the adder 60 and is lower than the original sound frequency F0. Is added to the fader 20 from the terminal B as a non-effect sound. That is, the non-effect sound is a signal obtained by adding the low frequency component of the original sound and the high frequency component of the original sound adjusted by the level adjuster 50. In the fader 20, the sound effect input from the terminal A and the non-effect sound input from the terminal B are mixed at a mixing ratio corresponding to the operation position of the knob (operator), and the mixed signal (output audio signal OUT) is mixed. Is output from this effect device. The fader 20 also plays a role of adjusting the level of the level adjuster 50 in accordance with the operation position of the knob.
[0017]
FIG. 2 is a diagram showing the relationship between the knob operation position of the fader 20 and the level of the level adjuster 50.
In FIG. 2, “A” and “B” shown on the horizontal axis (fader position) indicate that the ratio of the sound effect input from the terminal A and the ratio of the non-effect sound output from the terminal B are 100%. The knob operation position is shown. The closer the position is to “A”, the higher the mixing ratio of the sound effects, and the closer the position is to “B”, the higher the mixing ratio of the non-effect sounds.
[0018]
Here, focus on the non-effect sound. When the fader position is “A”, the audio signal obtained by doubling the level of the high frequency component and the low frequency component, that is, the low frequency component becomes an ineffective sound.
As the knob is operated and the fader position moves from “A” to “B”, the level of the high frequency component gradually increases, and as a result, the non-effect sound gradually includes more high frequency components. In other words, the high frequency components are gradually supplemented to approach the original sound. When the fader position reaches “B”, an audio signal obtained by doubling the level of the high-frequency component, that is, the high-frequency component output from the high-pass filter 30 as it is and the low-frequency component, ie, the original sound is not Sound effect.
[0019]
In summary, when the knob of the fader 20 is operated to bring the fader position closer to “A”, the proportion of the sound effect increases and the high frequency component of the non-effect sound decreases. Thereby, the interference in the high frequency component of the sound effect (in this embodiment, the effect is given to the high frequency component) and the non-sound effect is reduced.
Further, when the fader 20 is operated to bring the fader position closer to “B”, the ratio of the non-effect sound increases and the high-frequency component is supplemented to the non-effect sound. That is, it approaches the original sound. Thereby, an original sound can be output without a component missing.
[0020]
FIG. 3 is a diagram illustrating another example of the relationship between the fader knob operation position and the level of the level adjuster 50.
When the level control as shown in FIG. 3 is performed, when the fader position is gradually brought closer to the position “B” from the position “A”, the high frequency component of the original sound is not included in the non-effect sound until halfway. The interference between the sound effect and the non-effect sound is further reduced.
[0021]
FIG. 4 is a block diagram of a second embodiment of the effect device of the present invention.
In this embodiment, the high-pass filter 30 is a filter that extracts a high-frequency component having a frequency F0 or higher from the original sound, as in the first embodiment shown in FIG. 1, and the effector 10 gives an effect to the output of the high-pass filter 30. Thus, the sound effect is input from the terminal A to the fader 20. The low-pass filter 70 can adjust the cut-off frequency f between the frequency F0 for cutting the high-frequency component of the original sound from the original sound and the frequency F1 for allowing the whole band of the original sound to pass through. This is a filter that extracts components below f and inputs them to the fader 20 from the terminal B as non-effect sounds. The fader 20 mixes and outputs the sound effect input from the terminal A and the non-effect sound input from the terminal B at a mixing ratio according to the knob operation position, and the low-pass filter 70 according to the knob operation position. Adjust the cut-off frequency f.
[0022]
FIG. 5 is a diagram illustrating a change in the cut-off frequency f of the low-pass filter 70 with respect to the knob operation position (fader position) of the fader 20. As described above, F0 is the same frequency as the cutoff frequency F0 of the high-pass filter 30, and F1 is a frequency that allows the entire band of the original sound to pass.
Here, focus on the non-effect sound. When the fader position is “A”, the cutoff frequency f of the low-pass filter 70 is set to the frequency F0. The low-pass filter 70 extracts a low-frequency component having a frequency f = F0 or less from the original sound, and the low-frequency component Becomes a non-effect sound.
[0023]
As the knob is operated and the fader position gradually moves from “A” to “B”, the cut-off frequency f of the low-pass filter 70 gradually changes from the frequency F0 to the frequency F1, and as a result, Non-sound effects gradually contain more high frequency components. In other words, the high frequency components are gradually supplemented to approach the original sound. When the fader position reaches “B”, the cutoff frequency f of the low-pass filter 70 becomes the frequency F1, and the component of the entire band of the original sound, that is, the original sound becomes an ineffective sound.
[0024]
As described above, in the first embodiment, the high frequency component of the non-effect sound is increased / decreased by the level control, whereas in the second embodiment, the frequency of the filter is controlled.
FIG. 6 is a diagram illustrating another example of a change in the cutoff frequency of the low-pass filter 70 with respect to the knob operation position (fader position) of the fader 20.
[0025]
When the cutoff frequency control as shown in FIG. 6 is performed, when the fader position is gradually brought closer to the position “B” from the position “A”, the non-effect sound does not include the high frequency component of the original sound until halfway. (That is, the cut-off frequency f of the low-pass filter 70 remains at the frequency F0 until halfway), so that the interference between the sound effect and the non-effect sound is further reduced.
[0026]
Here, in each of the above embodiments, a high-frequency component is extracted from the original sound by a high-pass filter and an effect is applied to the extracted high-frequency component. However, the effect is not limited to the high-frequency component. For example, the high-pass filter 30 and the low-pass filter 40 in FIG. 1 may be interchanged to give an effect to the low-frequency component.
In the configuration shown in FIG. 4, the high-pass filter 30 and the low-pass filter 70 may be interchanged. In this case, the cutoff frequency of the high-pass filter is variable, and the fader position is changed from “A” to “B”. The cutoff frequency f of the high-pass filter may be changed from the frequency F0 to the lowest frequency of the original sound as it gradually moves to the position.
[0027]
Further, for example, in FIG. 1, a band pass filter that extracts components of frequencies Fa to Fb (Fa <Fb) is provided instead of the high pass filter 30, and components other than the frequencies Fa to Fb are extracted instead of the low pass filter. It is good also as a structure which provides an effect to the component of frequency Fa-Fb by providing a filter.
At this time, the filter for extracting components other than the frequencies Fa to Fb may be configured by combining a low-pass filter with a cutoff frequency f = Fa and a high-pass filter with a cutoff frequency f = Fb as shown in FIG. .
[0028]
Further, in the case where the method of applying the effect to the components of the frequencies Fa to Fb is applied to the configuration of FIG. 4, the low-pass filter is used as the fader position gradually moves from the position “A” to the position “B”. The cut-off frequency f may be changed from Fa to Fb, or the high-pass filter cut-off frequency f may be changed from Fb to Fa.
[0029]
In addition, in each of the above-described embodiments, it is not considered that the frequency distribution of the sound effect output from the effector may be different from the frequency distribution of the sound signal input to the effector. It can be considered.
For example, in FIG. 4, a high frequency component having a frequency F0 or higher is input to the effector 10, but the frequency component of the sound effect output from the effector 10 is a component having a frequency F0 ′ (≠ F0) or higher. There is a case. In this case, when it is desired to increase the ratio of the non-effect sound, the cut-off frequency f of the low-pass filter 70 is set to a frequency range of F0 ′ to F1 in order to prevent the non-effect sound from including a component having the frequency F0 ′ or higher as much as possible. To change within.
[0030]
In the configuration of FIG. 1, when considering the effector characteristics, the configuration of FIG. 1 may be changed as shown in FIG. In FIG. 8, a high-pass filter 80 is a filter that extracts a component (high-frequency component) having a frequency F0 ′ or higher from the original sound, and a low-pass filter 90 is a filter that extracts a component (low-frequency component) that is F0 ′ or lower from the original sound. .
[0031]
Furthermore, when the effector is configured so that multiple types of effects can be selected, it is possible that the frequency distribution change method (what kind of frequency characteristics the effector has) depends on the selected effect. Depending on the effect, the frequency distribution of the non-effect sound may be changed.
[0032]
【The invention's effect】
As described above, according to the present invention, it is possible to realize an effect device that can reduce the occurrence of interference that weakens the applied effect and can faithfully output the original sound.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a first embodiment of an effect device of the present invention.
FIG. 2 is a diagram showing a relationship between a fader knob operation position and a level adjuster level;
FIG. 3 is a diagram illustrating another example of a relationship between a fader knob operation position and a level adjuster level.
FIG. 4 is a configuration diagram of a second embodiment of the effect device of the invention.
FIG. 5 is a diagram illustrating a change in a cut-off frequency f of a low-pass filter with respect to a fader knob operation position (fader position).
FIG. 6 is a diagram illustrating another example of a change in the cutoff frequency of the low-pass filter with respect to a fader knob operation position (fader position).
FIG. 7 is a diagram illustrating frequency characteristics of a filter in which a low-pass filter and a high-pass filter are combined.
FIG. 8 is a configuration diagram of a modified example of the effect device shown in FIG. 1;
FIG. 9 is a diagram illustrating a configuration of an effect device including a mixing unit.
FIG. 10 is a diagram illustrating a configuration of an effect device.
FIG. 11 is a diagram illustrating a configuration of an effect device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Effector 20 Fader 30 High pass filter 40 Low pass filter 50 Level adjuster 60 Adder 70 Low pass filter 80 High pass filter 90 Low pass filter

Claims (6)

Signal component extraction means for extracting a signal component of a predetermined frequency band from the input audio signal;
An effect applying means for applying an effect to the signal component and outputting an effect applying signal;
A frequency characteristic adjusting means for adjusting a frequency characteristic of the input audio signal so as to freely change and outputting a characteristic adjustment signal;
Adding means for adjusting the level of the signal component and adding it to the characteristic adjustment signal to obtain an added signal;
Signal mixing means for mixing and outputting the input effect applying signal and the addition signal at an adjustable predetermined mixing ratio;
The effector is characterized in that the adding means adjusts the level of the signal component in accordance with the mixing ratio.   2. The effect device according to claim 1, wherein the signal component extracting unit includes a high-pass filter, and the frequency characteristic adjusting unit includes a low-pass filter.   3. The effect device according to claim 2, wherein the adding means increases the level of the signal component as the mixing ratio of the effect applying signal in the signal mixing means decreases. Signal component extraction means for extracting a signal component of a predetermined frequency band from the input audio signal;
An effect applying means for applying an effect to the signal component and outputting an effect applying signal;
A frequency characteristic adjusting means for adjusting a frequency characteristic of the input audio signal so as to freely change and outputting a characteristic adjustment signal;
Signal mixing means for mixing and outputting the input effect applying signal and the characteristic adjustment signal at a predetermined adjustable mixing ratio;
The effect device according to claim 1, wherein the frequency characteristic adjusting means adjusts a frequency characteristic of the input audio signal in accordance with the mixing ratio.   5. The effect device according to claim 4, wherein the signal component extracting unit includes a high-pass filter, and the frequency characteristic adjusting unit includes a low-pass filter.   6. The effect device according to claim 5, wherein the frequency characteristic adjusting unit increases the cutoff frequency of the low-pass filter as the mixing ratio of the effect applying signal in the signal mixing unit decreases.

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