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DESCRIPTION JP2014202892

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DESCRIPTION JP2014202892
Abstract: To prevent the occurrence of discomfort when mixing music. SOLUTION: A sound
device (100) comprises filter means (244) for extracting sound data of a medium to high
frequency band of any one music of two musics, and a sound of the middle to high frequency
band of one music during a mixing period. A mixing means (242, 243) for mixing data and sound
data of the other music, and an output means (241) for outputting sound data mixed by the
mixing means. [Selected figure] Figure 4
Sound equipment
[0001]
The present invention relates to the technical field of an audio device, a control method of the
audio device, and a program for automatically continuous reproduction by mixing processing of
two music pieces.
[0002]
As an apparatus of this type, for example, an apparatus is known in which mixing is performed
using an effect such as cross fade in order to continuously reproduce a plurality of music pieces
nonstop.
In such an apparatus, in order to realize more natural mixing, a technique has been proposed in
which mixing is performed by matching beat positions and tempos with the preceding and
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following songs (see, for example, Patent Document 1).
[0003]
JP 2003-108132 A
[0004]
However, even if the above-described technique is used, for example, depending on the detection
accuracy of the beat position, there is a possibility that the mixing may be shifted from the actual
beat position, and the mixing may be performed with the beat positions completely overlapped. It
is difficult in practice.
That is, only by adjusting the beat position, there arises a technical problem that the listener may
feel uncomfortable. In particular, natural mixing is extremely difficult because even a slight
deviation may cause discomfort in voices in a low frequency band in which a rhythm is carved.
The present invention has been made, for example, in view of the problems described above. It is
an object of the present invention to provide an audio device, a control method of the audio
device, and a program capable of preventing the occurrence of discomfort when mixing music.
[0005]
In order to solve the above problems, the audio device according to the present invention
includes filter means for extracting sound data of the middle and high frequency band of one of
the two music pieces, and the middle and high frequency band of the one music in a mixing
period. And mixing means for mixing sound data of the other music piece and output means for
outputting the sound data mixed by the mixing means.
[0006]
The control method of an audio device according to the present invention, in order to solve the
above problems, a filter step of extracting sound data of a medium to high frequency band of any
one music of two music, and a mixing step. A mixing step of mixing the sound data of the middle
and high frequency band with the sound data of the other music, and an output step of
outputting the sound data mixed in the mixing step.
[0007]
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In order to solve the above problems, the program of the present invention uses a computer,
filter means for extracting sound data in the middle to high frequency band of any one of the two
music pieces, and the middle and high pitch of the one music piece It functions as a mixing unit
that mixes sound data of a frequency band with sound data of the other music, and an output
unit that outputs the sound data mixed by the mixing unit.
[0008]
The effects and advantages of the present invention will be apparent from the modes for carrying
out the invention described below.
[0009]
It is a block diagram showing the hardware constitutions of the audio equipment concerning an
example.
It is a functional block diagram showing the software composition of the audio equipment
concerning an example.
It is a flowchart which shows operation | movement of the audio equipment which concerns on
1st Example.
It is a conceptual diagram which shows the mixing process by the audio equipment concerning
1st Example.
It is a flowchart which shows operation | movement of the audio equipment based on 2nd
Example. It is a conceptual diagram which shows the mixing process by the audio equipment
concerning 2nd Example.
[0010]
The audio device according to the present embodiment includes: filter means for extracting
sound data in the middle and high frequency band of one of the two music pieces; sound data of
the middle and high frequency band of the one music in the mixing period; It comprises a mixing
means for mixing the sound data of the other music, and an output means for outputting the
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sound data mixed by the mixing means.
[0011]
The audio device according to the present embodiment is configured to include, for example, a
central processing unit (CPU) having a music reproduction capability, a read only memory
(ROM), a random access memory (RAM), various processing circuits, and the like.
Also, it may be configured to include a large capacity storage for storing music data to be
reproduced and music information.
[0012]
At the time of operation of the audio device according to the present embodiment, the two pieces
of music are mixed in the mixing period and automatically continuously reproduced. Here, the
“mixing period” is a period set as a period in which the mixing process should be performed,
and is set, for example, as a period corresponding to a common part or similar part of the two
music pieces to be mixed. Also, the length of the mixing period may be set by the user.
[0013]
Here, particularly in the present embodiment, the sound data in the middle to high frequency
band is extracted by the filter means for any one of the two music pieces to be mixed. Here, the
“middle to high frequency band” is a band preset as a frequency band higher than the low
frequency band that includes sound data for cutting the rhythm of music, and for example, a
frequency band corresponding to a bass drum For example, it is set as a frequency band higher
than 100 Hz to 200 Hz (for example, a frequency band higher than 200 Hz). In other words, the
middle and high frequency band is a frequency band that does not include sound data for cutting
a rhythm, and the sound data of the middle and high frequency band to be extracted is sound
data in which rhythm sound is cut from the original sound data. The extraction of the sound data
in the middle and high frequency band described above is not performed for all parts of one
music, but may be performed partially (for example, only in the part corresponding to the mixing
period (that is, only the part to be mixed)) .
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[0014]
The sound data of the middle to high frequency band of one music extracted is mixed with the
sound data of the other music by the mixing means. As a result, while mixed sound data output
from the output means includes sound data of the middle to high frequency band of two music
pieces, while the other music piece is for the sound data of the low frequency band lower than
the middle to high frequency band. Only the ones will be included.
[0015]
Here, in the case where two pieces of music are mixed and output, there is a possibility that the
listener may feel a sense of incongruity due to a deviation of the beat position between the pieces
of music during the mixing period. Such deviations in the beat position can be adjusted, for
example, by detecting the beat position in advance, but it is practically difficult to completely
eliminate the deviation. In particular, the deviation of the beat position of the sound data in the
low frequency band in which the rhythm is formed may give a great sense of discomfort to the
listener even with a slight deviation.
[0016]
However, particularly in the present embodiment, as described above, the middle and high
frequency band of one music and the other music are mixed. That is, the sound data mixed in the
mixing period does not include the sound data of the low frequency band of the two music
pieces, but includes only the low frequency band of the other music. Therefore, it is possible to
preferably prevent the occurrence of discomfort due to the beat position of the sound data in the
low frequency band of the two music pieces being shifted and synthesized.
[0017]
In one aspect of the audio device according to the present embodiment, the filter means
respectively extracts sound data of the middle and high frequency band and sound data of a low
frequency band lower than the middle and high frequency band for the two music pieces. The
mixing unit mixes the sound data of the middle and high frequency bands of the music of 2
during the mixing period, and connects the sound data of the low frequency bands of the music
of 2 on a reproduction time axis.
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[0018]
According to this aspect, in addition to the sound data of the middle and high frequency band,
the sound data of the low frequency band is extracted by the filter means.
Also, the extraction target is not only one music but also two music. Therefore, in the filter
means, sound data of the middle and high frequency band of one music and sound data of the
low frequency band, and sound data of the middle and high frequency band of the other music
and sound data of the low frequency band are respectively extracted.
[0019]
And especially in this aspect, the sound data of the medium high frequency band of 2 music is
mixed by the mixing means. That is, the sound data of the middle and high frequency bands of
the two music pieces are processed so as to at least partially overlap in the mixing period. On the
other hand, the sound data in the low frequency band of the two music pieces are mutually
connected on the reproduction time axis by the mixing means. That is, unlike the middle and high
frequency bands described above, they are combined such that there is no overlapping portion.
The connection position is typically the start position or the end position of the mixing period,
but is not particularly limited as long as it is within the mixing period.
[0020]
According to such mixing processing, it is possible to produce a natural switching of music by
mixing sound data in the middle and high frequency bands. In addition, by linking the sound data
of the low frequency band, it is possible to prevent the occurrence of discomfort when the sound
data of the low frequency band of the two music pieces are combined. That is, it is possible to
prevent the listener from feeling unnatural because the beat positions of the sound data in the
low frequency band in which the rhythm is formed are shifted.
[0021]
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If the beat positions of the sound data in the low frequency band are aligned with each other at
the connection position, the generation of discomfort can be more effectively prevented. Further,
by setting the connecting position to the start position or the end position of the mixing period, it
is possible to make it difficult to notice the switching of music at the time of connection.
[0022]
In the aspect of mixing the sound data of the middle and high frequency band and the low
frequency body region described above, the mixing means mixes the sound data of the middle
and high frequency band by cross fading and concatenates the sound data of the low frequency
band. It is also good.
[0023]
In this case, sound data in the middle and high frequency bands of the two pieces of music are
mixed by cross fade.
That is, in the mixing period, the volume of the first reproduced song fades out so as to gradually
decrease, and at the same time, the volume of the next reproduced song fades in gradually.
Thereby, natural switching of music can be realized more preferably.
[0024]
On the other hand, the sound data of the low frequency band of the two music pieces are linked.
That is, sound data in the low frequency band is not mixed by cross fading as in the middle and
high frequency bands, and is combined such that there is no overlapping portion. Therefore, it is
possible to prevent the occurrence of a sense of discomfort when sound data in the low
frequency band of two music pieces is synthesized.
[0025]
In addition, it is preferable that sound data in the low frequency band be connected without
fading (attenuation). That is, it is preferable to connect without performing processing on the
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volume. By connecting in this way, it is possible to prevent the occurrence of the inconvenience
that the change in the volume greatly affects the sound data after synthesis because there is no
overlapping portion. Specifically, it can not cover the volume reduction of the faded-out music
with the volume of the faded-in music like the cross fade in the middle and high frequency band,
so it is easy to make the user feel uncomfortable You can avoid the problem.
[0026]
The operation and other gains of the audio device according to the present embodiment will be
described in more detail in the following examples.
[0027]
The control method of the audio device according to the present embodiment includes a filter
step of extracting sound data of the middle and high frequency band of any one of the two music
pieces, and a sound of the middle and high frequency band of the one music during the mixing
period. A mixing step of mixing data and sound data of the other music piece, and an output step
of outputting sound data mixed in the mixing step.
[0028]
According to the control method of the audio device according to the present embodiment,
similarly to the above-described audio device, generation of a sense of incongruity due to
deviation of beat positions of sound data in the low frequency band of 2 music pieces is
prevented appropriately can do.
[0029]
Also in the control method of the audio device according to the present embodiment, the same
aspects as the various aspects of the above-described audio device can be adopted.
[0030]
The program according to the present embodiment includes a computer, filter means for
extracting sound data of the middle and high frequency band of any one of the two music pieces,
and sound data of the middle and high frequency band of the one music during the mixing
period. And mixing means for mixing the sound data of the other music, and output means for
outputting the sound data mixed by the mixing means.
[0031]
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According to the program according to the present embodiment, similarly to the above-described
audio device, it is possible to preferably prevent the occurrence of discomfort due to the beat
position of the sound data of the low frequency band of two music pieces being shifted and
synthesized. .
[0032]
Also in the program according to the present embodiment, the same aspects as the various
aspects of the acoustic device described above can be adopted.
[0033]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0034]
<Device Configuration> First, the hardware configuration of the audio device according to the
present embodiment will be described with reference to FIG.
FIG. 1 is a block diagram showing the hardware configuration of the audio device according to
the embodiment.
[0035]
In FIG. 1, an audio apparatus 100 according to the present embodiment is configured as an
apparatus capable of reproducing music data and video data, and includes a large capacity
storage 110, a CPU 120, an image processing circuit 130, an LCD (Liquid Crystal Monitor) 140,
The ROM 150, the RAM 160, the sound processing circuit 170, and the speaker 180 are
provided.
[0036]
The large-capacity storage 110 is configured to include, for example, a recording medium such
as a hard disk, and stores music data and video data to be reproduced by the audio device 100.
[0037]
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The CPU 120 is configured as a controller unit capable of controlling the operation of the entire
audio device 100.
[0038]
The image processing circuit 130 is configured to be able to execute various processes for
reproducing video data, and outputs the processed video data to the LCD 140.
The LCD 140 is configured as a display capable of displaying a video according to the video data
input from the image processing circuit 130.
[0039]
The ROM 150 and the RAM 160 are recording media configured to be able to appropriately store
various types of information handled in the audio device 100, and output the stored information
to various portions as necessary.
[0040]
The sound processing circuit 170 is configured to be able to execute various processes for
reproducing music data, and outputs the processed music data to the speaker 180.
The speaker 180 is configured to be able to output an audio according to the music data input
from the sound processing circuit 170.
[0041]
Next, the software configuration of the audio device according to the present embodiment will be
described with reference to FIG.
FIG. 2 is a functional block diagram showing a software configuration of the audio device
according to the embodiment.
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[0042]
In FIG. 2, the audio device 100 according to the present embodiment includes a music data
storage unit 210, a music information extraction unit 220, a music information storage unit 230,
and a reproduction control unit 240.
[0043]
The music data storage unit 210 is configured, for example, as the large-capacity storage 110
described above, and can output music data to the music information extraction unit 220 and the
reproduction control unit 240.
[0044]
The music information extraction unit 220 is a music metadata extraction unit 221 that extracts
metadata (for example, the playback length and the like) of music, a music measure / beat
position detection unit 222 that detects bars and beat positions of music, and music And a music
tempo detection unit 223 for detecting the tempo of the music.
The music information extraction unit 220 can extract various data related to music from the tag
information of music data stored in the music data storage unit 210, the result of music analysis
processing, etc., and can output the data to the music information storage unit 230. .
[0045]
The music information storage unit 230 stores a music metadata storage unit 231 for storing
metadata of music, a music measure / beat position storage unit 232 for storing bar and beat
positions of music, and a music tempo storage unit for storing tempo of music It has 233.
The music information storage unit 230 stores various information related to the music extracted
by the music information extraction unit 220, and can be output to the reproduction control unit
240 as appropriate.
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[0046]
The reproduction control unit 240 includes a reproduction unit 241, a reproduction tempo
control unit 242, a mixing processing unit 243, and an effect control unit 244.
The reproduction unit 241 reproduces music based on the reproduction list and the reproduction
time information.
The reproduction tempo control unit 242 reproduces the music while controlling the
reproduction tempo as necessary.
In addition, in the portion where the reproduced music is switched, the previous music and the
next music are reproduced while being partially mixed so that the music is not interrupted.
The mixing processing unit 243 performs control so that the tempos of the previous and next
songs and the bar / beat positions are aligned with each other as necessary.
The effect control unit 244 performs effect processing such as cross fade, low pass filter, high
pass filter and the like in the mix section.
[0047]
<Description of Operation> Next, the operation of the audio device according to the present
embodiment will be described by taking a plurality of examples.
In the following, among the operations of the audio apparatus according to the present
embodiment, the mixing process closely related to the present invention will be described in
detail, and the description of other general operations will be omitted as appropriate.
[0048]
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First Embodiment First, the operation of the audio device according to the first embodiment will
be described with reference to FIG.
FIG. 3 is a flowchart showing the operation of the audio device according to the first
embodiment.
In the following description, among the two pieces of music on which the mixing process is
performed, the piece to be reproduced first is referred to as the "previous piece" and the piece to
be reproduced later is referred to as the "next piece".
[0049]
In FIG. 3, at the time of operation of the audio device 100 according to the present embodiment,
first, audio data of the previous music is acquired (step S101), and it is determined whether the
current reproduction position is within the mix section with the next music. (Step S102). Here,
the mix section is a section corresponding to the “mixing period” of the present invention, and
is a section in which the previous song and the next song are mixed with each other (that is,
subjected to the mixing process). When the reproduction position is not a mix section (step S102:
NO), the sound of the previous music is output without executing the mixing process (step S110).
[0050]
When the reproduction position is a mix section (step S102: YES), the low frequency band
component of the sound data of the previous music is cut by the effect control unit 244 (see FIG.
2) (step S103). In addition, the low frequency band here is set to the frequency band (for
example, 100 Hz-200 Hz) corresponding to the bass drum which engraves a rhythm. For this
reason, the audio data in which the low frequency band component is cut is audio data of only
the medium and high frequency band (for example, 200 Hz or more) component. That is, the
processing here can be rephrased as extraction of medium and high frequency band components.
[0051]
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Subsequently, the output level of the sound data of the previous music is adjusted according to
the relative position in the mix section (step S104). Specifically, the output level of the sound
data of the previous song is reduced as the relative position in the mix section is later, so that the
previous song and the next song are mixed by cross-fading. As described above, since the low
frequency band component of the audio data of the previous music is cut, it is the audio data of
the middle and high frequency band components of the previous music whose output level is
adjusted.
[0052]
On the other hand, when the reproduction position of the previous music is within the mix
section, the audio data of the next music is also acquired (step S105). Then, the output level of
the audio data of the next song is also adjusted according to the relative position in the mix
section (step S106). Specifically, the output level of the audio data of the next song is increased
as the relative position in the mix section is later, so that the previous song and the next song are
mixed by cross fading. However, as for the next song, the low frequency band component is not
cut as in the previous song, so the output level is adjusted for all frequency bands.
[0053]
When the output levels of the previous song and the next song are adjusted, the audio data of the
previous song and the next song are mixed with each other (step S107). That is, the audio data of
the previous song and the audio data of the next song are superimposed to form one audio data.
The mixed audio data is output to the speaker 180 (see FIG. 1) (step S108). After the audio data
is output, the reproduction position is updated (step S109), and the series of processes related to
the mixing process is completed. The series of processes are repeatedly performed, and the
mixing process is sequentially performed for each reproduction position.
[0054]
Next, audio data output by the mixing process according to the above-described embodiment will
be specifically described with reference to FIG. FIG. 4 is a conceptual view showing mixing
processing by the audio device according to the first embodiment.
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[0055]
As shown in FIG. 4, in the audio data output by the above-described mixing processing, the low
frequency band component of the preceding music in the mix section is cut. Thus, the mixed
audio data contains only the low frequency band component of the next song.
[0056]
Here, in the case where the two pieces of music are mixed and output, the listener may feel a
sense of incongruity due to the deviation of the beat positions of the pieces of music in the mix
section. Such deviations in the beat position can be adjusted, for example, by detecting the beat
position in advance, but it is practically difficult to completely eliminate the deviation. In
particular, the deviation of the beat position of the sound data in the low frequency band in
which the rhythm is formed may give a great sense of discomfort to the listener even with a
slight deviation.
[0057]
On the other hand, in the present embodiment, the medium and high frequency band component
of the preceding music and the entire frequency band component of the other music are mixed
with each other. Therefore, it is possible to preferably prevent the occurrence of discomfort due
to the beat positions of the sound data in the low frequency band of the two music pieces being
shifted and mixed with each other.
[0058]
Note that, instead of cutting the low frequency band component of the preceding music, cutting
of the low frequency band component of the next music may be performed. That is, if the low
frequency band component of one of the two music pieces to be mixed is cut, the abovedescribed effect is exhibited.
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[0059]
As described above, according to the audio device 100 in the first example, it is possible to
prevent the occurrence of discomfort when mixing music.
[0060]
Second Embodiment Next, the operation of the audio device according to the second embodiment
will be described with reference to FIG.
FIG. 5 is a flowchart showing the operation of the audio device according to the second
embodiment.
[0061]
The second embodiment differs from the above-described second embodiment only in part of the
operation, and the other parts are substantially the same. Therefore, in the following, portions
different from the first embodiment will be described in detail, and description of the other
overlapping portions will be appropriately omitted.
[0062]
In FIG. 5, at the time of operation of the audio device 100 according to the second embodiment,
first, the sound data of the previous music is acquired (step S201), and it is determined whether
the current reproduction position is in the mix section with the next music. (Step S202). Then,
when the reproduction position is not a mix section (step S202: NO), the sound of the previous
music is output without executing the mixing process (step S211). On the other hand, when the
reproduction position is the mix section (step S202: YES), the low frequency band component of
the sound data of the previous music is cut (step S203), and the sound data of the previous music
is selected according to the relative position in the mix section. The output level is adjusted (step
S204).
[0063]
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On the other hand, when the reproduction position of the previous music is within the mix
section, the audio data of the next music is also acquired (step S205). Here, particularly in the
second embodiment, the low frequency band component and the other components (that is, the
middle and high frequency band components) are respectively extracted from the acquired audio
data of the next music (step S206). In other words, the audio data of the next song is divided into
the low frequency band component and the middle and high frequency band component.
[0064]
Then, the output level of the audio data of the next song is also adjusted according to the relative
position in the mix section (step S207). However, the adjustment of the output level here is
performed only for the middle and high frequency band components of the next song. That is,
the output level of the low frequency band component of the next song is not adjusted.
[0065]
When the output levels of the previous song and the next song are adjusted, the audio data of the
previous song and the next song are mixed with each other (step S208). That is, the audio data of
the previous song and the audio data of the next song are superimposed to form one audio data.
Here, in particular, the middle and high frequency band components of the preceding music and
the next music are mixed by cross fade, while the low frequency band components of the
preceding music and the next music are connected on the reproduction time axis. That is, the low
frequency band components are combined such that there is no overlap.
[0066]
The mixed audio data is output to the speaker 180 (step S209). After the audio data is output, the
reproduction position is updated (step S210), and the series of processes related to the mixing
process is completed.
[0067]
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Next, the audio data output by the mixing process according to the second embodiment
described above will be specifically described with reference to FIG. FIG. 6 is a conceptual view
showing mixing processing by the audio device according to the second embodiment.
[0068]
As shown in FIG. 6, according to the above-described mixing process, middle to high frequency
band components of the preceding music and the next music are mixed by cross fade. On the
other hand, the low frequency band component of the preceding music is cut at the start position
of the mix section. Also, the low frequency band component of the next song is reproduced from
the start position of the mix section without adjusting the output level. For this reason, in the
audio data after mixing, the low frequency band components of the preceding music and the next
music are switched at the start position of the mixing section.
[0069]
In this way, it is possible to preferably prevent the occurrence of discomfort due to the beat
position of the audio data in the low frequency band of the two music pieces being shifted and
mixed, and without interrupting the sound data in the low frequency band It can be played back.
That is, as in the first embodiment, it is possible to prevent the audio in the low frequency band
from being interrupted temporarily near the start position of the mix section due to the cut of the
low frequency band component of the preceding music. However, in the second embodiment,
since the low frequency band components and the medium and high frequency band components
are processed separately, the amount of calculation of software increases compared to the first
embodiment. In other words, compared with the second embodiment, the first embodiment can
reduce the load on the apparatus due to the mixing process.
[0070]
In the second embodiment described above, the low frequency band components of the previous
song and the next song are connected at the start position of the mix section, but the connection
position may be the end position of the mix section. In this case, the low frequency band
component of the next song is cut to the end of the mix interval, and the low frequency band
component of the previous song is output to the end of the mix interval.
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[0071]
As described above, according to the audio apparatus 100 of the second embodiment, the
occurrence of discomfort can be effectively prevented by mixing the low frequency band
component and the middle and high frequency band component of the music in different ways. It
is possible.
[0072]
The present invention is not limited to the above-described embodiment, and can be
appropriately modified without departing from the scope or spirit of the invention as can be read
from the claims and the specification as a whole, and an acoustic device with such a modification
A control method of audio equipment and a program are also included in the technical scope of
the present invention.
[0073]
DESCRIPTION OF SYMBOLS 100 audio equipment 110 large capacity storage 120 CPU 130
image processing circuit 140 LCD 150 ROM 160 RAM 170 sound processing circuit 180 speaker
210 music data storage unit 220 music information extraction unit 221 music metadata
extraction unit 222 music bar / beat position detection unit 223 Music tempo detection unit 230
Music information storage unit 231 Music metadata storage unit 232 Music bar / beat position
storage unit 233 Music tempo storage unit 240 reproduction control unit 241 reproduction unit
242 reproduction tempo control unit 243 mixing processing unit 244 effect control unit
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