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JP2018019154

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DESCRIPTION JP2018019154
Abstract: The present invention provides a "parametric equalizer device" which allows a user to
easily find out the optimum frequency band for adjusting the sound quality of a target audio
element (vocal, specific musical instrument, etc.). SOLUTION: An equalizing unit (4) capable of
variably adjusting Q value and gain of a frequency arbitrarily selected in a frequency band of an
audio signal input from a sound source, selection of the frequency, and selection Operation unit
(61) for setting the Q value of the frequency and the adjustment amount of the gain, and when
the frequency is selected, extracts and outputs an audio signal in a frequency band of a
predetermined range around the frequency And a control unit (2) for controlling the equalizing
unit so as to execute the specific band reproduction adjustment mode. [Selected figure] Figure 1
Parametric equalizer device, audio reproduction device
[0001]
The present invention relates to a parametric equalizer device that adjusts the frequency
characteristic of an audio signal to adjust the sound quality of reproduced audio, and an audio
reproduction device provided with the parametric equalizer device.
[0002]
The equalizer device is an audio device capable of adjusting the frequency characteristic of an
audio signal, and is used, for example, to improve the sound quality of music or the like
reproduced by the audio reproducing device or to change it to suit the user's preference. .
07-05-2019
1
Common equalizer devices are roughly divided into graphic equalizers and parametric equalizers.
[0003]
The graphic equalizer device divides a frequency band (generally an audible band of 20 to 200
kHz) of a reproduced audio signal into a plurality of parts by a predetermined bandwidth, and
increases or decreases the amplitude (gain) for each divided frequency band. To adjust the
volume (see, for example, Patent Document 1). Although the graphic equalizer device is relatively
easy to operate, since the adjustable frequency is determined by the divided bandwidth, the
sound quality adjustment may not be performed as expected.
[0004]
On the other hand, the parametric equalizer device can select an arbitrary frequency within the
frequency band of the audio signal to be reproduced, and further adjusts the Q factor (Quality
factor) and the amplitude (gain) with the selected frequency as the central axis. It can be
configured. In a general parametric equalizer, the adjustment point formed by three parameters
(frequency, Q value, amplitude) is one channel, and a plurality of channels can be formed in the
frequency band to adjust the frequency characteristic of the audio signal It has become.
[0005]
The parametric equalizer device can adjust three parameters (frequency, Q value, amplitude)
variably, and therefore, it is possible to perform finer sound quality adjustment than a graphic
equalizer. Furthermore, a technology has also been established for displaying the frequency
characteristic curve of the adjusted audio signal on the display, and the frequency characteristic
can be adjusted using not only hearing but also sight.
[0006]
JP, 2005-175562, A
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2
[0007]
However, for a user of a general audio reproducing apparatus, the frequency around which the
frequency band (20 to 200 kHz) displayed on the operation unit or the like or the frequency
characteristic curve displayed on the display unit is observed There are few people who have the
expertise to adjust the range of the target sound element (vocals, specific instruments, etc.) by
adjusting.
As an example, as shown in FIG. 7, it is desirable to adjust the range of about 200 to 800 Hz to
adjust the range of female vocals, and about 100 to 400 Hz to adjust the range of male vocals.
Although it is desirable to adjust the frequency band, few people know such correlations.
Therefore, for the user of a general audio reproduction apparatus, the operation of the equalizer
apparatus is still forced to be complicated by trial and error.
[0008]
Patent Document 1 discloses a graphic equalizer device which extracts an audio signal included
in a selected frequency band and outputs the audio signal for a predetermined time when any
one of the divided frequency bands (Band 1 to 9) is selected. There is. With this configuration, it
is possible to determine whether the frequency band is to be the target of level adjustment.
However, the pitch range of female vocals is about 600 Hz (about 200 to 800 Hz), and that of
male vocals is about 300 Hz (about 100 to 400 Hz). Furthermore, even with the same female
vocal, there are variations in the position and width of the sound range depending on the voice
quality and the like. Therefore, in the graphic equalizer device in which the frequency band is
divided mechanically, it is not always possible to extract the frequency band optimal for adjusting
the sound quality of the target audio element.
[0009]
The present invention has been made in view of such circumstances, and allows the user to easily
find out a frequency band that is most suitable for adjusting the sound quality of a target audio
element (vocal, specific musical instrument, etc.). It is an object of the present invention to
provide a parametric equalizer device that can be used and an audio reproduction device
equipped with the parametric equalizer device.
[0010]
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The parametric equalizer according to the present invention comprises an equalizing unit capable
of variably adjusting Q value and gain of a frequency arbitrarily selected within a frequency band
of an audio signal input from a sound source, selecting and selecting the frequency. Operation
unit for inputting the Q value of the selected frequency and the adjustment amount of the gain,
and specific band reproduction for extracting and outputting an audio signal in a predetermined
frequency band with the frequency as an axis when the frequency is selected And a control unit
configured to control the equalizing unit so as to execute the adjustment mode.
[0011]
By adopting such a configuration, when an arbitrary frequency is selected and the specific band
reproduction adjustment mode is executed, the sound within the predetermined range is
reproduced with the arbitrarily selected frequency as an axis, so the target audio element
Whether or not (vocal, specific instrument, etc.) is selected can be determined promptly.
If the target speech element can not be heard, the predetermined range may be reset by
reselecting the frequency.
As a result, it is possible to easily find out the optimum frequency band for adjusting the sound
quality of the target voice component.
[0012]
In the specific band reproduction adjustment mode, the control unit can control the equalizing
unit to mask an audio signal outside the frequency band of the predetermined range.
[0013]
With this configuration, the sound outside the predetermined range is muted, and only the sound
within the set predetermined range can be heard, so the sound quality of the target sound
element (vocal, specific musical instrument, etc.) It can be easily determined whether or not the
frequency is suitable for adjusting.
[0014]
It is preferable that the frequency band of the predetermined range is a frequency band of a
range affected by the Q value and the gain set to the selected frequency.
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[0015]
With such a configuration, the width of the frequency band in a predetermined range can be
variably adjusted by using the Q value and gain as parameters, so that the range of the target
voice element (vocal, specific musical instrument, etc.) can be adjusted. After finding it, it is also
possible to adjust the width of the predetermined frequency band so as to cover as much as
possible the entire sound range of the target audio element.
[0016]
In the specific band reproduction adjustment mode, when the selection of the frequency is
changed by the operation unit, the control unit uses the current Q value and the set value of the
gain to use the audio signal of the frequency band affected at the changed frequency. The
equalizing unit can be controlled to reextract.
[0017]
With such a configuration, when the specific band reproduction adjustment mode is executed,
even if the sound of the target sound element (vocal, specific instrument, etc.) is not heard at all,
the setting value of the frequency is set to the high frequency side / It is possible to move the
frequency band of the predetermined range quickly to the range of the target audio element only
by sliding to the low frequency side.
As a result, it is possible to easily find out the range of the target sound element.
[0018]
In the specific band reproduction adjustment mode, when the Q unit and / or the gain adjustment
amount is changed by the operation unit, the control unit re-executes the voice signal in the
frequency band affected by the changed Q value and / or the gain. The equalizing unit can be
controlled to extract.
[0019]
With such a configuration, by adjusting the width of the frequency band in the predetermined
range, it is possible to cover as much as possible the entire range of the target audio element
(vocal, specific musical instrument, etc.).
07-05-2019
5
[0020]
Further, according to the audio reproducing apparatus of the present invention, an audio source
serving as a sound source, the above-described parametric equalizer for adjusting the frequency
characteristic of an audio signal input from the audio source, and an audio signal output from the
parametric equalizer And a speaker device for outputting an audible sound.
[0021]
With such a configuration, the user can easily find out the optimum frequency band for adjusting
the sound quality of the target audio element (vocal, specific instrument, etc.) in detail for the
above-mentioned reason. It becomes possible.
As a result, the user of the audio reproduction apparatus can enjoy and enjoy the audio improved
in the sound quality or changed to suit the user's preference.
[0022]
According to the present invention, there is provided a parametric equalizer which allows the
user to easily find out the optimum frequency band for adjusting the sound quality of the target
audio element (vocal, specific musical instrument, etc.), and the parametric equalizer. Can be
embodied.
[0023]
FIG. 1 is a block diagram showing an overall configuration of an audio reproduction device
provided with a parametric device according to an embodiment of the present invention.
It is an operation screen which performs equalizing operation in the said audio reproduction
apparatus.
It is a figure explaining the specific zone set up by the above-mentioned equalizing operation.
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It is an operation screen when the said equalization operation is performed.
It is an operation screen when the said equalization operation is performed.
It is an operation screen when the said equalization operation is performed.
It is an operation screen when the said equalization operation is performed.
It is a control flow which performs the said equalizing operation. It is a figure explaining the
relationship between the width | variety of the said specific band, and the range width of the
audio | voice element made into the objective. It is a correlation diagram which shows the
frequency band matched with the audio | voice element which comprises music.
[0024]
Embodiments of the present invention will be described using the drawings.
[0025]
An on-vehicle audio reproduction apparatus provided with a parametric equalizer apparatus
according to an embodiment of the present invention is configured as shown in FIG.
[0026]
As shown in FIG. 1, the audio reproduction device 1 is configured by a computer unit (including a
CPU), and includes a processing unit 2 as a control unit that executes various processes
according to a program or the like.
Audio unit group 3 (including CD / DVD drive, digital television, digital radio, etc.) for outputting
digital content such as video and music as audio source to processing unit 2, audio signal output
from audio unit group 3 An equalizing unit 4 for adjusting the frequency characteristics (i.e.,
sound quality) of the above and a speaker device 5 for outputting a sound whose sound quality
has been adjusted are connected.
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[0027]
Furthermore, the audio reproduction device 1 is configured by an LCD panel, and is configured
by a display unit 6 provided on an instrument panel or the like on the front seat side of the
vehicle, and a touch panel etc. provided integrally on the display unit 6 (LCD panel). And an
operation unit 61.
The processing unit 2 executes various processes based on input information according to
various operations by the operation unit 61, and causes the display unit 6 to display information
such as a video or an image obtained by various processes.
[0028]
A storage unit 7 (for example, a hard disk drive) that stores various information and programs
necessary for controlling the audio unit group 3, equalizing unit 4, speaker device 5, LCD panel
6, and display unit 61 in the processing unit 2. Is connected.
[0029]
The equalizing unit 4 includes an equalizing (EQ) processing unit 41, a digital filter 42, and a
digital / analog (D / A) converter 43.
The EQ processing unit 41 is constituted by a digital signal processor (DSP) generally adopted in
a parametric equalizer device, and adjusts the frequency characteristic of the audio signal based
on the control signal from the processing unit 2 (control unit). The control signal is generated
based on parameters (frequency, Q value, amplitude) set by the user through the operation unit
61. More specifically, in the equalizing process, when an arbitrary frequency is selected through
the operation unit 61, a channel is assigned to the frequency, and the frequency characteristic is
adjusted according to the Q value and the adjustment amount of the amplitude set through the
operation unit 61. Do. The audio signal in which the frequency characteristic of the
corresponding channel is adjusted is transmitted to the speaker device 5 through the digital filter
42 and the D / A converter 43. The user usually adjusts the frequency characteristics by
changing parameters (frequency, Q value, amplitude) while playing back audio.
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8
[0030]
FIG. 2 shows a preferable example of the operation screen 8 displayed on the display unit 6 when
performing the equalizing process. When a menu for executing equalization processing is
selected from the main screen (not shown) during audio reproduction, the processing unit 2
reads out the information of the operation screen 8 of FIG.
[0031]
In normal equalization operation, while listening to the sound outputted from the speaker device
5, the frequency increase / decrease key 81 is touched to arbitrarily change the frequency, and
the Q value increase / decrease key 82 and the level (amplitude) increase / decrease key 83 are
touched. The adjustment amount is adjusted stepwise. In the example of FIG. 2, the adjustment
amount of the Q value is configured to be adjustable to, for example, +3 steps, with the default
value being “1”. In addition, the amplitude (gain) is set to 0 level before adjustment, and can be
adjusted to ± 7 levels. In the example shown in FIG. 2, nine channels can be formed in the
audible band, and a frequency characteristic curve FC after Q values and levels have been
adjusted for all channels is shown as an example. ing. Note that "Channel 1" displayed on the
operation screen 8 indicates the channel currently being operated. Furthermore, the Q value in
the present embodiment indicates the ratio of “the range of frequencies affected by gain” to
“the adjustment amount of gain”. That is, assuming that the "adjustment amount of gain" is
constant, the "range of frequency affected by gain" increases as the Q value increases, and the
"range of frequency affected by gain" decreases as the Q value decreases. .
[0032]
As mentioned above, the normal equalizing operation is to adjust the frequency characteristics
while playing the audio normally. On the other hand, when it is desired to adjust the sound
quality of a specific sound element, such as increasing the volume of female vocals or decreasing
the volume of drums, the user executes the "specific band reproduction adjustment mode".
[0033]
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9
When the “specific band reproduction adjustment mode” is executed according to the
procedure described later in detail, the processing unit 2 (control unit) takes an axis selected at
an arbitrary frequency by the user as an axis as shown in FIG. 3 as an example. A frequency band
in a predetermined range is set as the specific band 9. Furthermore, the processing unit 2
extracts and outputs an audio signal within the range of the set specific band 9, and generates a
control signal for masking and muting an audio signal outside the range of the specific band 9,
and equalizing Transmit to section 4 The width of the specific band 9 is preferably set in a range
affected by the Q value and the gain set to the selected frequency. As shown in FIG. 3 as a
preferred example, the range from the bottom to the bottom of the frequency curve formed in a
mountain shape with the selected frequency as the central axis can be set as the specific band 9.
The range from the bottom to the bottom is calculated by the processing unit 2 based on the
parameters (frequency, level, Q value).
[0034]
As a modified example of setting the range of the specific band 9, when the selected frequency is
F, the range of 0.5 F to 2 F may be set as the specific band 9. For example, in the example of FIG.
3, since the frequency is 400 Hz, the range of 200 Hz to 800 Hz is set as the specific band 9. The
coefficient by which the frequency F is multiplied can be changed as appropriate.
[0035]
Hereinafter, as an example of the procedure of the equalizing operation in the specific band
reproduction adjustment mode, an operation procedure for searching for the tone range of the
female vocal from the flat state of the frequency characteristic curve and raising the volume will
be described with reference to FIG. 4 and FIG. . Here, it is assumed that it is a female vocalist who
has a sound range at 300 to 500 Hz as a virtual case.
[0036]
4A to 4D show the operation procedure of the user in the specific band reproduction adjustment
mode, and FIG. 5 shows the control flow thereof. First, in a state where music is being
reproduced, when the user touches the position of an arbitrary frequency in the frequency
characteristic curve with the finger 100 as shown in FIG. 4A, the processing unit 2 executes the
specific band reproduction adjustment mode The channel 1 is assigned to (step S1 in FIG. 5). In
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the example of FIG. 4A, channel 1 is assigned to the frequency “60 Hz”. The processing unit 2
executes the specific band reproduction adjustment mode until the touched finger 100 is
released (see step S5 in FIG. 5).
[0037]
Subsequently, as shown in FIG. 4B, when the user slides the finger 100 touched upward, the
processing unit 2 determines a level adjustment amount based on the movement distance, and
generates a control signal. Transmit to equalizing unit 4. In the example of the figure, it is raised
to the level "5". Furthermore, the processing unit 2 sets a specific band 9 based on three
parameters of frequency, Q value and level (step S2 in FIG. 5). In the example of FIG. 4B, the band
from the bottom to the bottom of the mountain-shaped frequency curve formed by the frequency
“60 Hz”, the level “5” and the default value “1” of the Q value is set as the characteristic
band 9.
[0038]
Further continuously, the processing unit 2 extracts and outputs an audio signal within the range
of the set specific band 9, and generates a control signal for masking and muting an audio signal
outside the range of the specific band 9. Transmit to equalizing unit 4. In this case, since the
voice signal of female vocal is not included in the range of the specific band 9, the voice of
female vocal can not be heard from the speaker device 5.
[0039]
Therefore, the user slides the touched finger 100 toward the high frequency side as shown in
FIG. 4C in order to find out the range of the female vocal. The processing unit 2 generates a
control signal that raises the frequency according to the movement of the finger 100, resets the
specific band 9 using the current level “5” and the Q value “1”, and transmits it to the
equalizing unit 4 (Step S3 in FIG. 5). As a result, the specific band 9 slides to the high frequency
side, and the audio corresponding to the specific band 9 that slides is audible from the speaker
device 5. Then, when the specific band 9 reaches the female vocal range, the voice of the female
vocal starts to be heard from the speaker device 5. The user stops sliding movement of the finger
100 where the female vocal voice can be heard naturally. In the example of FIG. 4C, the
frequency is "400 Hz".
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[0040]
When it is desired to further increase the volume of female vocals at the frequency "400 Hz", the
user slides the finger 100 touched again to the upper direction. The processing unit 2 resets the
specific band 9 based on the newly set level and transmits it to the equalizing unit 4.
[0041]
Furthermore, if a part of the female vocal voice from the speaker device 5 can not be heard
naturally, the user considers that the width of the specific band 9 is narrow and adds, for
example, a thumb to the touch as shown in FIG. 4D. Take a two-finger touch with your index
finger and slide the thumb to open it. The processing unit 2 determines the adjustment amount
of the Q value based on the degree of separation (distance between the thumb and forefinger),
generates a control signal, and transmits the control signal to the equalizing unit 4. In the
example of the figure, the Q value is raised to “3”. The processing unit 2 further resets the
specific band 9 based on the frequency "400 Hz", the level "5", and the Q value "3", and transmits
it to the equalizing unit 4 (step S4 in FIG. 5).
[0042]
By the above operation, when the finger 100 touched is released where the voice of the female
vocal sounds most natural, as shown in step S5 of FIG. 5, the specific band reproduction
adjustment mode is ended, and the frequency "400 Hz", the level "5". The control signal reflecting
the frequency characteristic of channel 1 set to Q value “3” and outputting the audio signal of
all the bands as usual is transmitted to equalizing unit 4. This makes it possible to listen to music
with the female vocal volume raised.
[0043]
On the other hand, if it is desired to lower the volume of a specific audio element, the specific
band playback adjustment mode finds a frequency band optimal for adjusting the sound quality
of the target audio element, and then slides the finger downward to level To lower the level to a
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negative level. Alternatively, the level may be reduced to a negative level by a normal equalizing
operation after ending the specific band reproduction adjustment mode.
[0044]
According to the audio reproduction device 1 provided with the above-described parametric
equalizer device, the target voice element (vocal, identification, etc. is set by setting the specific
band 9 in which the width can be varied using frequency, level and Q value The user can easily
find out the most suitable frequency band for adjusting the sound quality of the musical
instrument, etc.).
[0045]
Furthermore, by setting the specific band 9 using the frequency, the level and the Q value, there
is an advantage that the position and width of the specific band 9 can be matched to the range of
the target audio element.
That is, for a female vocalist who has a sound range of 300 to 500 Hz assumed in the above
example, even if the optimum frequency 400 Hz is found, as shown in FIG. 6, the level "1" and
the Q value "1". In the specific band 9 set as described above, only a part of the female vocalist's
range is included. Therefore, by raising the level to "5" and further raising the Q value to "3" to
adjust the width of the specific band 9, it is possible to set the specific band 9 to include the
range of this female vocalist. It is possible.
[0046]
As described above, the parametric equalizer device according to the present invention and the
audio reproducing device provided with the parametric equalizer device use the user to select the
frequency band most suitable for adjusting the sound quality of the target audio element (vocal,
specific musical instrument, etc.) It is useful as a device that allows the user to enjoy the audio
with the desired sound quality.
[0047]
DESCRIPTION OF SYMBOLS 1 audio reproducing apparatus 2 processing unit (control part) 3
audio unit group 4 equalizing part 41 EQ processing part 42 digital filter 43 D / A converter 5
speaker apparatus 6 display part 61 operation part
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