JP2018174389

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DESCRIPTION JP2018174389
Abstract: To provide a parametric equalizer that dynamically changes frequency characteristics
in response to changes in pitch. A control unit 140 obtains a difference between a pitch value
input to a pitch value input unit 130 and an initial pitch value, obtains a new frequency based on
the difference and an initial frequency, and obtains a new frequency from a new frequency and
an initial bandwidth. After determining the bandwidth, each setting is adapted to the parametric
equalizer 110. The initial pitch value, the initial frequency, and the initial bandwidth are stored in
the storage unit 150. As a result, even if the pitch changes, it is possible to dynamically change
the frequency characteristics, which was obtained before the pitch change. [Selected figure]
Figure 1
ダイナミック イコライザー
[0001]
The present invention relates to an equalizer that dynamically performs signal processing on
changes in sound.
[0002]
In order to change the frequency characteristics of the audio signal, there is an equalizer which
determines an arbitrary frequency and bandwidth and enhances or reduces the band to make the
sound easy to hear or hard to hear.
[0003]
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However, in the above-mentioned prior art, since the frequency characteristics of the audio signal
largely change if the pitch changes, even if the arbitrarily determined band is changed, the same
effect as before the pitch change can not be obtained. There was a thing.
An object of the present invention is to solve the above-mentioned problems and to provide an
equalizer which can obtain an expected effect even if the pitch changes.
[0004]
An audio signal processing apparatus according to the present invention comprises an audio
input unit for inputting an audio signal, a parametric equalizer for processing an audio signal, a
pitch value input unit for inputting a pitch value, and an initial value in a memory. A recording
unit for recording settings, a control unit for deriving and adapting new parametric equalizer
settings from the initial settings of the recording units in the memory and the inputted pitch
value, and an audio output unit for outputting a processed audio signal And have.
[0005]
Therefore, the audio signal can be dynamically processed by the control unit deriving and setting
a new frequency of the setting of the parametric equalizer in accordance with the inputted pitch
value.
[0006]
In the audio signal processing device according to the present invention, in the recording unit in
the memory, the setting storage unit for storing the setting of the parametric equalizer, the initial
frequency recording unit for recording the initial frequency, and the initial pitch value are stored.
And an initial bandwidth storage unit for storing the initial bandwidth, and a bandwidth
coefficient storage unit storing a bandwidth coefficient table for each frequency.
[0007]
In the audio signal processing device according to the present invention, in the control unit, the
program is stored as a control program in the memory, and a pitch for calculating a difference
between the initial pitch value and the inputted pitch value and deriving the pitch value
difference A value difference calculation means, a new frequency calculation means for deriving
a new frequency based on an initial frequency and a pitch value difference, and a new bandwidth
calculation means for deriving a new bandwidth based on the new frequency There is.
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[0008]
The audio signal processing apparatus according to the present invention derives the pitch value
difference A by subtracting the initial pitch value s stored in the initial pitch value recording unit
of the memory from the inputted pitch t in the pitch value difference calculating means. Be
prepared to do.
[0009]
In the audio signal processing device according to the present invention, the new frequency
calculation means derives the new frequency F by the following equation using the derived pitch
value difference A and the initial frequency f stored in the recording unit. As a feature.
[0010]
The audio signal processing device according to the present invention has a table in which the
tone value difference and the frequency difference corresponding to the tone value difference are
recorded in the storage unit, and the tone value derived by the new frequency calculation means
in claim 4 The frequency difference α corresponding to the value difference A is added to the
initial frequency f to calculate the following equation for deriving a new frequency.
[0011]
In the audio signal processing device according to the present invention, the table of the
bandwidth coefficient β corresponding to the derived new frequency is stored in the storage
unit of the memory in the new bandwidth calculating means, and the bandwidth b of the initial
setting is multiplied. , The new bandwidth B is derived by calculating the following equation.
[0012]
The audio signal processing device according to the present invention sets the derived new
frequency F and new bandwidth B in the setting storage unit of the parametric equalizer of the
storage unit in the memory, and reflects the setting in the parametric equalizer as needed.
Prepare.
[0013]
It is a block diagram showing the whole audio signal processing device of this invention.
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It is a block diagram which shows one of the forms of a control part and a recording part.
It is a block diagram which shows one of the forms of a control part and a recording part.
It is a figure which shows the frequency difference table corresponding to a pitch value
difference.
It is a figure which shows the hardware of the whole audio signal processing apparatus.
It is a figure which shows a user interface.
It is a figure which shows the flowchart of the whole audio signal processing apparatus of this
invention.
[0014]
FIG. 1 shows a block diagram of the best mode for carrying out the present invention.
FIG. 7 shows a flowchart.
The audio signal input to the audio input unit 100 is subjected to signal processing by the
parametric equalizer 110 and output from the audio output unit 120.
[0015]
Here, the control unit 140 calculates a new set value by the calculation means from the pitch
value signal input from the pitch value input unit 130 and the data of the recording unit 150,
and dynamically adapts it to a parametric equalizer according to the pitch. It is possible to
determine the setting value of 110.
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[0016]
First, initialize the settings.
It is step S1 of the flowchart.
[0017]
Next, display the user interface screen.
It is step S3 of the flowchart.
[0018]
Next, set the initial pitch value, initial frequency, initial bandwidth, and gain parameters.
And store in the recording unit. It is step S5 of the flowchart.
[0019]
FIG. 6 shows a user interface. There are an initial frequency parameter that determines an initial
frequency, an initial bandwidth parameter that determines an initial bandwidth, a gain parameter
that determines a gain, and an initial pitch value parameter that determines an initial pitch value.
Set the parameters here.
[0020]
Next, check if sound is input. To the end if not entered. If it is input, the process proceeds to step
S7 of the flowchart.
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[0021]
Next, enter the pitch value. Step S9 in the flowchart.
[0022]
The new frequency and bandwidth are then derived and adapted to the parametric equalizer
settings. It is step S11 of the flowchart. Details are shown below.
[0023]
Detailed roles of the control unit 140 and the recording unit 150 are shown in FIG. The
recording unit 150 includes an initial pitch recording unit 151, an initial frequency recording
unit 152, an initial bandwidth recording unit 153, and a setting storage unit 154 of a parametric
equalizer.
[0024]
In the control unit 150, the pitch difference calculation means 141 first receives the pitch value
from the pitch value input unit 130 and subtracts the initial pitch storage unit 151 of the
recording unit to obtain the pitch value difference. Assuming that the input pitch is t and the
initial pitch is s, the pitch value difference is derived by the following expression.
[0025]
The new frequency difference calculation means 142 receives the pitch value difference A from
the pitch value difference calculation means 141, receives the initial frequency f from the initial
frequency storage unit 152 of the recording unit 150, and obtains the new frequency F from the
following equation.
[0026]
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The new bandwidth calculation means 143 receives the new frequency F from the new frequency
calculation means 142, receives the initial bandwidth b from the initial bandwidth recording unit
153 of the recording unit 150, and multiplies the bandwidth coefficient β corresponding to the
new frequency F The new bandwidth B is obtained from the following equation ○.
[0027]
Next, the setting of the frequency stored in the setting storage unit 154 of the parametric
equalizer of the storage unit 150 is updated to the new frequency F.
Further, the bandwidth setting stored in the setting storage unit 154 of the parametric equalizer
of the recording unit 150 is updated to the new bandwidth B.
It is step S13 of the flowchart.
[0028]
The hardware configuration is shown in FIG. It has a CPU for signal processing, a display for
displaying a user interface, an audio input device for inputting an audio signal, an audio output
power device for outputting an audio, and a memory, and the memory unit contains a recording
unit and control The program is stored.
[0029]
An embodiment is described in conjunction with FIGS. 3 and 4. In addition to the mode for
carrying out the invention, the recording unit 150 has a frequency difference storage unit 155.
The frequency difference storage unit 155 has a frequency difference table corresponding to the
pitch value difference shown in FIG. 4 and obtains the frequency difference α corresponding to
the pitch value difference A and adds it to the initial frequency f according to the following
equation The frequency F can be determined.
[0030]
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100 ... audio input unit 110 ... parametric equalizer 120 ... audio output unit 130 ... pitch value
input unit 140 ... control unit 150 ... recording unit
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