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JP2010154466

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DESCRIPTION JP2010154466
PROBLEM TO BE SOLVED: To provide an audio signal processing device and an audio signal
processing method which can be easily handled by a general user and can intuitively set
processing characteristics of an audio signal. SOLUTION: A signal processing unit which
performs filter processing on an audio signal based on variable frequency characteristics, a
display unit which displays a screen for setting the frequency characteristics of the signal
processing unit, and input of frequency characteristics by a user An audio signal processing
method in an audio signal processing apparatus comprising: an operation unit, wherein an image
including a pointer movable by an operation by the user via the operation unit and a point to
which a frequency is assigned is generated A method of displaying on the display unit and setting
the frequency characteristic of the signal processing unit according to the distance between the
pointer and the point. [Selected figure] Figure 2
Audio signal processing apparatus and audio signal processing method
[0001]
The present invention relates to an audio signal processing apparatus having an audio signal
characteristic variable function such as an equalizer function and an audio signal processing
method.
[0002]
Some audio devices, such as home audio devices, include an equalizer for adjusting the frequency
characteristics of the audio signal.
08-05-2019
1
An equalizer generally comprises a plurality of parameters that can adjust multiple frequency
bands. The user changes each parameter by operating the slide volume switch or the like, and
increases or decreases the level (gain) for each frequency band to adjust the frequency
characteristics (for example, see Patent Documents 1 and 2).
[0003]
JP-A-7-30348 JP-A-11-112254
[0004]
In conventional equalizers, the user interface is generally configured using numbers and
waveforms.
In order to operate the equalizer correctly, knowledge of frequency, decibel (dB), overall
waveform, etc. is required.
[0005]
However, a general user who does not have expert knowledge can not understand even if the
setting is displayed by numbers or waveforms, and may not use the equalizer function or may
not use it. In addition, although it is preferable for users with specialized knowledge that many
parameters can be set, it is not only extremely troublesome for general users, but may be set
incorrectly by some users. Similar problems may exist in other audio signal processing devices
having setting functions such as tone control.
[0006]
In view of the above circumstances, the present invention has an object of providing an audio
signal processing apparatus and an audio signal processing method which can be easily handled
by a general user and can intuitively set processing characteristics of audio signals. .
[0007]
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2
In order to achieve the above object, an audio signal processing apparatus according to a first
aspect of the present invention comprises: a signal processing unit that performs filter
processing on an audio signal based on variable frequency characteristics; and setting frequency
characteristics of the signal processing unit. An image including a display unit for displaying a
display screen, an operation unit for receiving an input of frequency characteristics by the user, a
pointer movable by an operation by the user via the operation unit, and a point to which a
frequency is assigned A central processing unit configured to generate and display on the display
unit, and to set a frequency characteristic of the signal processing unit according to a distance
between the pointer and the point.
[0008]
In the above configuration, the central processing unit generates an image in which the points to
which the frequency is assigned are arranged on the circumference centering on the initial
position of the pointer.
Here, the central processing unit may arrange the points to which the frequency is assigned on
the same circumference such that the magnitudes of the frequencies are continuous and the
points to which the maximum frequency and the minimum frequency are assigned are adjacent
to each other. Deploy.
[0009]
In the above configuration, the pointer is movable in the circle.
[0010]
In the above configuration, the central processing unit generates, for example, an image obtained
by dividing the circle into a plurality of areas, including a display representing a frequency
characteristic assigned to the areas.
The area is displayed together with the display of, for example, "Warm", "Cool", "Neutral" or the
like.
08-05-2019
3
[0011]
In order to achieve the above object, in an audio signal processing method according to a second
aspect of the present invention, a signal processing unit that performs filter processing on an
audio signal based on variable frequency characteristics, and frequency characteristics of the
signal processing unit are set. A voice signal processing method in a voice signal processing
apparatus, comprising: a display unit for displaying a screen for the user and an operation unit
for receiving an input of a frequency characteristic by a user, wherein the method is movable by
operation by the user via the operation unit An image including a pointer and a point to which a
frequency is assigned is generated and displayed on the display unit, and the frequency
characteristic of the signal processing unit is set according to the distance between the pointer
and the point. It is characterized by
[0012]
In the above method, the central processing unit generates an image in which the points to which
the frequency is assigned are arranged on the circumference centering on the initial position of
the pointer.
Here, the central processing unit may arrange the points to which the frequency is assigned on
the same circumference such that the magnitudes of the frequencies are continuous and the
points to which the maximum frequency and the minimum frequency are assigned are adjacent
to each other. Deploy.
[0013]
In the above method, the pointer is movable in the circle.
[0014]
In the above method, the central processing unit generates, for example, an image obtained by
dividing the circle into a plurality of regions, including a display representing a frequency
characteristic assigned to the regions.
The area is displayed together with the display of, for example, "Warm", "Cool", "Neutral" or the
like.
08-05-2019
4
[0015]
According to the present invention, an audio signal processing apparatus and an audio signal
processing method are provided which are easy to handle for general users and can intuitively
set processing characteristics of audio signals.
[0016]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
The embodiment described below is an example, and the present invention is not limited to this.
In the embodiments shown below, the present invention will be described in line with the case
where it is applied to an equalizer.
[0017]
A block diagram of the equalizer 10 according to the present embodiment is shown in FIG. As
shown in FIG. 1, the equalizer 10 includes a central processing unit 12, a signal processing unit
14, an operation unit 16, and a display unit 18. The equalizer 10 according to the present
embodiment is configured such that the user can set the gain (dB) for each band divided into a
plurality of frequencies, for example, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, and 8
kHz. It is done.
[0018]
The central processing unit 12 centrally controls the operation of the equalizer 10. Further, as
described later, the central processing unit 12 generates a user interface image for the user to set
the gain for each frequency band.
08-05-2019
5
[0019]
The signal processing unit 14 functions as a digital filter that processes the input audio signal
according to the parameters supplied from the central processing unit 12. The signal processing
unit 14 performs filter processing according to the control signal related to the gain for each
frequency band supplied from the central processing unit 12. The signal processing unit 14
filters the audio signal converted into a digital signal by the AD conversion unit 15. When a
digital audio signal is directly input, the AD converter 15 may not be provided. The digital audio
signal filtered by the signal processing unit 14 is converted to an analog audio signal by the DA
conversion unit 17 and output.
[0020]
The operation unit 16 has an operation unit 16 configured of a mouse, a pen tablet, and the like.
The user performs frequency setting and the like to be described later via the operation unit 16.
The display unit 18 includes a liquid crystal display device or the like, and displays a user
interface image generated by the central processing unit 12.
[0021]
The user looks at the user interface image on the display unit 18 and operates the operation unit
16 to input the filter parameter supplied to the signal processing unit 14. The central processing
unit 12 supplies a parameter to the signal processing unit 14 according to the input parameter,
generates a changed user interface image, and causes the display unit 18 to display the image.
[0022]
Next, setting processing of the equalizer 10 in the present embodiment will be described with
reference to the drawings.
[0023]
FIG. 2 shows a processing flow of the equalizer 10 according to the present embodiment.
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6
The equalizer 10 according to the present embodiment has a setting mode of filter parameters
particularly for beginners. In addition to this mode, a mode may be provided which provides an
equalizer function using general numerical values and waveforms. When the user sets the
equalizer function, for example, the central processing unit 12 displays a selection screen of a
setting mode for beginners and accepts an input.
[0024]
When the user selects the setting mode for beginners via the operation unit 16 (Yes in step S11),
the central processing unit 12 generates an input screen as shown in FIG. 3 and displays the
input screen on the display unit 18.
[0025]
In the example shown in FIG. 3, a double circle is displayed on the display unit 18.
The inner circle is shown as the "Neutral" part. Further, “Cool” and “Warm” are displayed
around the outer circle so as to face each other, and indicate one and the other of the annular
regions surrounding the inner circle, respectively. That is, the inside of the outer circle is divided
into approximately three areas. Furthermore, at the center of the circle, a pointer P whose
position can be changed is arranged. From “Warm” to “Cool”, for example, gradation of
color is applied to the annular area, but the form and the like are not limited thereto. The user
can move the pointer P via the operation unit 16 but can not move it outside the circle.
[0026]
The in-circle position of the pointer P is acquired by the central processing unit 12 as internally
processed coordinates. More specifically, the position information of the pointer P is acquired as
distance information from a point on the outer circumference assigned corresponding to a
plurality of frequencies.
[0027]
08-05-2019
7
FIG. 4 shows the assignment of frequencies in the example of FIG. As shown in the figure, points
A to H are arranged at equal intervals (45 degrees intervals) on the outer periphery. Each point is
assigned a frequency so that its magnitude is continuous (A: 63 Hz, B: 125 Hz, C: 250 Hz, D: 500
Hz, E: 1 kHz, F: 2 kHz, G: 4 kHz, H: 8 kHz).
[0028]
In the example shown in FIG. 4, the position information of the pointer P is acquired as the
distances α1 to α8 to the points A to H. FIG. 4 shows a state in which the equalizer function is
not exhibited for the input signal, the center of the circle is equal to the initial position of the
pointer P, and the distances α1 to α8 from the pointer P (center) are set to the same initial
value. It is done. The central processing unit 12 calculates the distance by, for example, arranging
the points A to H on the circumference of the radius 1 centered on the origin of the xy axis.
[0029]
When the user operates the pointer P, the central processing unit 12 acquires position
information of the pointer P (FIG. 2, step S12). For example, when the pointer P moves as shown
in FIG. 5, position information of the pointer P is calculated as distances β1 to β8 as shown in
FIG.
[0030]
The central processing unit 12 calculates the gain from the distance after movement at each
frequency (FIG. 2, step S13). That is, when the distance at a certain frequency is (βx−αx)> 0 (x
= 1, 2,..., 8), the distance is converted into dB information as a positive gain. When the distance is
(βx−αx) <0, the distance is converted to dB information as a negative gain (step S14).
[0031]
The central processing unit 12 calculates dB information for each frequency band, and
determines a filter coefficient (step S15). The determined filter coefficients are supplied to the
signal processing unit 14 and used for signal processing. If there is no new input, the central
08-05-2019
8
processing unit 12 ends the process.
[0032]
Referring to the example shown in FIGS. 5 and 6, the pointer P is from the area of "Neutral" to
the area of "Cool", in particular, point A (corresponding to 63 Hz), point B (corresponding to 125
Hz), point G (4 kHz) , And the distance from the point H (corresponding to 8 kHz) is increased. At
this time, the gains of the high band and the low band increase. Conversely, the distance from
point C (corresponding to 250 Hz), point D (corresponding to 500 Hz), point E (corresponding to
1 kHz), point F (corresponding to 2 kHz) decreases, that is, the mid-range gain decreases. .
[0033]
In the example shown in FIGS. 5 and 6, such a pattern having a large gain in the high and low
bands and a small gain in the middle band is represented as "Cool", and a pattern having a large
gain in the middle band is "Warm". Is represented. Also, a relatively flat pattern in which the
change in distance is within a certain value from the initial value is expressed as "Neutral". The
user can set the equalizer simply by intuitively moving the pointer in the “Cool” or “Warm”
direction. Of course, expressions other than "Cool", "Warm" and "Neutral" can be used.
[0034]
Flat characteristic, so-called "don's char" with high and low frequencies emphasized, and
relatively moderate characteristic pattern such as so-called "Kamaboko" with mid range, for
novice users, in particular If so, it can be said that the equalizer function is sufficiently
satisfactory. In addition, in the case where the numerical value is changed for each frequency
band, there is a possibility that an erroneous characteristic may be set such that a general user
emphasizes only a specific frequency band. However, according to the above embodiment, such a
situation can be prevented and the user can be properly guided.
[0035]
As described above, in the present embodiment, an image including the pointer movable by the
08-05-2019
9
user's operation through the operation unit 16 and the point to which the frequency is assigned
is displayed on the display unit 18. The central processing unit 12 sets the frequency
characteristic of the signal processing unit 14 according to the distance between the pointer and
each point. Further, the central processing unit 12 generates an image obtained by dividing a
circle into a plurality of areas, including a display representing frequency characteristics
(“Warm”, “Cool”, “Neutral”) assigned to the areas.
[0036]
Thus, according to the present embodiment, the user can realize the desired frequency
characteristics only by moving the pointer to the area to which the desired characteristic display
is attached. Such an operation can be intuitively grasped from the display image by the user, and
is very easy to handle for general users.
[0037]
The frequency characteristics set by the movement of the pointer are sufficient for general users,
and since the movement of the pointer is limited to the inside of a circle, it is possible to prevent
a user's erroneous setting.
[0038]
The present invention is not limited to the above embodiment, and various changes,
modifications, and the like are possible.
Although the setting is made variable for eight frequency bands in the above embodiment, it may
be made variable for bands of 9 or more or 7 or less. Also, although the frequency setting is set
to be divided into three, "Neutral", "Warm", and "Cool", the present invention is not limited to this,
and may be divided into two or four or more.
[0039]
Further, in the above embodiment, the points to which the frequency is assigned are arranged at
equal intervals on the same circumference, but the intervals are not limited to equal and may be
set as appropriate.
08-05-2019
10
[0040]
Further, in the above embodiment, although the equalizer has been described as an example, the
present invention is also applicable to tone control and the like.
[0041]
It is a block diagram showing composition of an equalizer concerning an embodiment of the
invention.
It is a processing flow figure of the equalizer concerning an embodiment of the invention.
It is an example of the display image at the time of the setting concerning embodiment of this
invention. It is a figure which shows the distance of a pointer and a point. It is an example of the
display image at the time of the setting concerning embodiment of this invention. It is a figure
which shows the distance of a pointer and a point.
Explanation of sign
[0042]
10: Equalizer, 12: central processing unit, 14: signal processing unit, 16: operation unit, 18:
display unit, P: pointer
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