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JP2009060209

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009060209
The present invention provides a reproduction apparatus capable of obtaining frequency
characteristics of a reproduction signal more appropriately matched to audio characteristics of
individual users and frequency characteristics of an electroacoustic transducer in use.
SOLUTION: An output means for supplying a test tone signal of each predetermined frequency
and outputting a test tone to an electroacoustic transducer which outputs a reproduced sound
based on a reproduced audio signal in a reproducing apparatus (step 31, 35), input means for
accepting whether or not the test tone of each frequency output from the electroacoustic
transducer can be heard (steps 32 to 34), the frequency of the audio signal supplied to the
electroacoustic transducer Adjustment means for adjusting the characteristics based on the input
result from the input means and step 36 are provided. [Selected figure] Figure 3
Reproducing apparatus, program, and frequency characteristic adjustment method in
reproducing apparatus
[0001]
The present invention relates to a reproduction apparatus comprising means for adjusting the
frequency characteristic of an audio signal supplied to an electroacoustic transducer for
outputting reproduction sound, a program for causing a computer to function as the
reproduction apparatus, and the frequency of an audio signal in the reproduction apparatus. It
relates to a method of adjusting the characteristics.
[0002]
Conventionally, in an apparatus having a tone reproduction function such as a music player or
the like, there may be prepared in advance a mode of various sound quality effects such as a
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preset equalizer or a sound mode.
[0003]
For example, in Patent Document 1, modes of frequency characteristics by various equalizers
preset corresponding to each preset button are stored in advance with names such as jazz, rock,
pop, classical, etc. There is disclosed a playback apparatus in which when the preset button is
pressed, the frequency characteristic of the playback signal is set by the equalizer corresponding
to the preset button.
[0004]
In Patent Document 2, as a technology that can set frequency characteristics suitable for
speakers to be used, plural kinds of output characteristic information corresponding to plural
kinds of speakers are stored, and at the time of manufacture, According to the selected output
characteristic information, the frequency characteristic of the audio signal to be supplied to the
speaker is detected according to the selected output characteristic information. An information
processing apparatus is disclosed that adjusts the
[0005]
JP 10-261 928 JP JP-2006-339 908 JP
[0006]
However, the above-mentioned preset sound effect mode is previously determined for a specific
combination using a combination of a playback device, a reference earphone, a reference
headphone, and a reference speaker.
Therefore, one of the preset sound quality effect modes may not be well matched to the audible
level of the user's earphones or the user's own ear.
[0007]
The object of the present invention is, in view of such problems of the prior art, that the
frequency characteristics of the reproduced signal more appropriately match the audio
frequency characteristics of individual users and the frequency characteristics of the
electroacoustic transducer in use. Providing a playback device that can obtain
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[0008]
According to a first aspect of the present invention, there is provided a reproduction apparatus
comprising: storage means for storing music data; reproduction means for reproducing an audio
signal based on the music data stored in the storage means; and the reproduction means Output
means for supplying a test tone signal of each predetermined frequency and outputting a test
tone to an electroacoustic transducer that outputs reproduced sound based on the audio signal of
the above, and each frequency outputted from the electroacoustic transducer The input means
for receiving the input as to whether or not the test tones can be heard, and the adjustment
means for adjusting the frequency characteristic of the audio signal supplied to the
electroacoustic transducer based on the input result by the input means. It is characterized by
[0009]
Here, as the reproduction apparatus, for example, one that reproduces music or one that
reproduces a video with sound is applicable.
As an electroacoustic transducer, a headphone and a speaker correspond, for example.
[0010]
In this configuration, when the output means sequentially supplies the test tone signal of each
predetermined frequency to the electroacoustic transducer to sequentially output the test tone, it
is possible to hear the test tone of each frequency sequentially output. The input means
sequentially receives the input related to
At this time, the output test tone is affected by the frequency characteristics of the
electroacoustic transducer.
Therefore, the input result by the input means represents a frequency characteristic obtained by
integrating the frequency characteristic of the electroacoustic transducer and the audio
frequency characteristic of the user.
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Therefore, based on the input result, the adjusting means adjusts the frequency characteristic of
the audio signal supplied to the electroacoustic transducer so as to be a preferable characteristic
for the combination of the audio frequency characteristic of the current user and the
electroacoustic transducer. Can.
[0011]
A playback apparatus according to a second aspect of the present invention is the playback
apparatus according to the first aspect, wherein each of the predetermined frequencies in the test
tone signal of each of the predetermined frequencies is of each frequency band for which gain
adjustment is performed by an equalizer preset in the apparatus. The center frequency is a center
frequency, and the adjustment of the frequency characteristic is performed as a correction to the
gain value of each frequency band in the equalizer.
[0012]
A reproduction apparatus according to a third aspect of the present invention is the storage
means according to the first or second aspect, storing the input result by the input means in
association with identification information of the electroacoustic transducer used for the output
of the test tone. The adjustment means corresponds to the identification information of the given
electro-acoustic transducer among the input results corresponding to each of the electro-acoustic
transducer stored by the storage means. It is characterized in that it is based on
[0013]
The reproduction apparatus according to the fourth invention is the reproduction apparatus
according to the third invention, wherein identification information for specifying the electroacoustic transducer is stored in the electro-acoustic transducer, and the reproduction apparatus
determines the identification information as the identification information It is characterized in
that it comprises means for reading from the electroacoustic transducer.
[0014]
In the playback apparatus according to the fifth invention, in the invention according to any one
of the first to fourth inventions, the output means performs the output of the test tone of each
frequency while changing the level, and the input means performs a test of each frequency It is
characterized in that an input as to whether or not it is audible for the tone is accepted for each
output at the required multiple levels of the test tone.
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[0015]
In the playback apparatus according to the sixth invention, in any of the first to fifth inventions,
the test tone of each frequency is that of a sine wave of the frequency or a predetermined
frequency range centered on the frequency. It is characterized by
[0016]
A program according to a seventh invention is characterized in that a computer is caused to
function as each means in the reproducing apparatus according to any one of the first to sixth
inventions.
[0017]
An adjusting method of frequency characteristics in a reproducing apparatus according to an
eighth aspect of the present invention is a reproducing apparatus comprising: a storage unit
storing music data; and a playback unit reproducing an audio signal based on the music data
stored in the storage unit. A method of adjusting frequency characteristics, comprising: an output
step of supplying a test tone signal of each predetermined frequency to output a test tone to an
electroacoustic transducer that outputs a reproduced sound based on an audio signal from the
reproducing means. The input step accepting the input as to whether or not the test tone of each
frequency output in the output step can be heard, and the frequency characteristic of the audio
signal supplied to the electroacoustic transducer based on the input result in the input step And
an adjusting step of adjusting.
[0018]
According to the present invention, the electro-acoustic transducer outputs a test tone of each
predetermined frequency, receives an input as to whether or not it is audible, and based on the
input result, an audio signal to be supplied to the electro-acoustic transducer. Since the frequency
characteristics are adjusted, it is possible to adjust the frequency characteristics of the audio
signal to be reproduced so as to be a preferable characteristic for the combination of the user's
audio frequency characteristics at the time of adjustment and the frequency characteristics of the
electroacoustic transducer.
[0019]
FIG. 1 is a front view of a music player according to an embodiment of the present invention.
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In the figure, 1 is this music player, 2 and 3 are headphones and speakers connectable to the
music player 1, and 4 is a headphone jack provided on the music player 1 for connecting the
headphones 2 and the speaker 3. is there.
The music player 1 includes an operation key 14a and a display screen 13a which constitute a
user interface.
[0020]
FIG. 2 is a block diagram showing the configuration of the music player 1.
As shown in the figure, the player controls a player, controls a processor 11, processes a variety
of information, a memory 12 accessed by the processor 11, and a display unit displays a variety
of information under control of the processor 11. 13. From the operation unit 14 for the user to
perform operation input to the processing unit 11, the audio output unit 15 for converting the
reproduced signal from the processing unit 11 into voice and outputting it, and other devices via
the USB cable A USB interface 16 for transferring music files to the playback device is provided.
The display unit 13 is configured using the display screen 13a.
The operation unit 14 is configured using the operation key 14 a.
Further, the audio output unit 15 is configured by the headphones 2 and the speakers 3
connected to the player.
[0021]
The memory 12 stores music files of formats such as MP3, WMA, WAV, etc. used for playing
music.
The processing unit 11 accepts the selection of the music file in the memory 12 by the user
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interface function of the operation unit 14 and the display unit 13 in accordance with a
predetermined program, and reproduces the selected music.
The playback device supports mass storage mode, and can directly access the memory 12 from a
personal computer or the like via the USB interface 16.
Therefore, the music file in the personal computer can be transferred to the memory 12 or the
music file in the memory 12 can be deleted by a drag and drop operation or the like on the
personal computer.
[0022]
FIG. 3 is a flowchart showing frequency characteristic improvement processing in the processing
unit 11.
In this process, the processing unit 11 repeats the process of steps 31 to 35 for each
predetermined frequency to check whether the user can listen to the sine wave of each
frequency, and based on the result of this investigation. The frequency characteristics of the
reproduction signal are adjusted.
[0023]
That is, when the process is started, first, in step 31, the processing unit 11 transmits the sine
wave of the first frequency of each frequency to the audio output unit 15, and outputs it as a
sound wave of a predetermined volume. This sound wave is output from the headphone 2 or the
speaker 3 connected to the player 1. At the same time, a message is displayed on the display
screen 13a prompting the user to use the operation key 14a to indicate whether the sound wave
has been heard.
[0024]
Next, at step 32, it is determined whether or not the user's input has been within a
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predetermined time. If it is determined that there is an input by the user, in step 33, the input
result, that is, the result as to whether or not the output sine wave is heard is recorded, and the
process proceeds to step 35. If it is determined that there is no input by the user within the
predetermined time, in step 34, the output sine wave is regarded as not being able to be heard,
the result is recorded, and the process proceeds to step 35.
[0025]
In step 35, it is determined whether the survey has been completed for all of the predetermined
frequencies. If it is determined that the process has not been completed, the process returns to
step 31 and the same examination is performed on the next frequency. If it is determined that the
investigation has been completed for all the frequencies, the process proceeds to step 36, where
the frequency characteristic of the reproduction signal is adjusted based on the investigation
result. That is, for the frequency that the user could not hear, the frequency characteristic of the
reproduction signal is appropriate for the user and the headphone 2 or the speaker 3 in use by
increasing the gain of the reproduction signal or the like in a predetermined band centered on
that frequency. Adjust to be something. When the adjustment is completed, the process of FIG. 3
ends.
[0026]
According to the present embodiment, for each predetermined frequency, a sine wave is output
from the headphone 2 or the speaker 3 in use to investigate whether the user can listen or not,
and based on the investigation result, the frequency of the reproduction signal Since the
characteristic is adjusted, the frequency characteristic of the reproduced signal is improved so
that the frequency characteristic suitable for the user using the music player and the headphone
2 or the speaker 3 used by connecting to the music player can be obtained. can do.
[0027]
FIG. 4 is a flowchart showing another example of the frequency characteristic improvement
processing in the processing unit 11.
In this process, the processing unit 11 repeats the process of steps 41 to 45 for the center
frequency of each frequency band for which gain adjustment is performed by the currently
selected one of various equalizers preset in the music player. Then, investigate whether the user
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can hear the test tone of each center frequency. And based on this research result, the frequency
characteristic suitable for the headphone 2 or the speaker 3 which is used by connecting the
adjustment value of the gain in each frequency band of the equalizer concerned to the user using
the music player and the music player It is corrected so as to obtain. In addition, as a test tone of
each center frequency, for example, white noise or pink noise belonging to a band of a range of 1
kHz before and after the center frequency can be extracted and used by a low pass filter and a
high pass filter. .
[0028]
That is, first, in step 41, the test tone of the first frequency among the center frequencies is
transmitted to the audio output unit 15, and is output as a sound wave of a predetermined
volume. This sound wave is output from the headphone 2 or the speaker 3 connected to the
player 1. At the same time, a message is displayed on the display screen 13a prompting the user
to use the operation key 14a to indicate whether the sound wave has been heard.
[0029]
Next, at step 42, it is determined whether or not the user's input has been within a
predetermined time. If it is determined that the user has made an input, the result of the input,
that is, whether the output test tone has been heard is recorded, and the process proceeds to step
45. If it is determined that there is no input by the user within the predetermined time, in step
44, the output test tone is regarded as not being able to be heard and the result is recorded, and
the process proceeds to step 45.
[0030]
In step 45, it is determined whether the survey for all of the center frequencies has been
completed. If it is determined that the process is not completed, the process returns to step 41 to
repeat the examination for the next center frequency. If it is determined that the investigation
has been completed for all center frequencies, the process proceeds to step 46, and based on the
investigation result, the adjustment value of the gain of each frequency band for which gain
adjustment is performed by the equalizer is corrected. That is, for a band whose center frequency
is the frequency at which the user can not listen to the test tone, the frequency characteristic of
the reproduction signal adjusted by the equalizer is corrected by correcting the adjustment value
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such that the gain adjustment value increases. Each adjustment value is corrected to be
preferable to the user and the headphone 2 or the speaker 3 in use. When the correction is
completed, the process of FIG. 4 is ended.
[0031]
According to the present embodiment, by performing the processing of FIG. 4 with respect to
various equalizers preset in advance, the user using the music player, the frequency
characteristic of the reproduction signal obtained by adjusting each of the equalizers, and The
headphone 2 or the speaker 3 used by being connected to the music player can be further
improved.
[0032]
The present invention is not limited to the above-described embodiments, and can be
appropriately modified and implemented.
For example, although not mentioned above, the adjustment value of each equalizer corrected by
the improvement process of FIG. 4 is stored in association with the identification information of
the earphone, headphone or speaker used in the improvement process. When the identification
name of one of the equalizers and identification information such as earphones is given, the
adjustment value corresponding to the name and the identification information is read out, and
the gain is adjusted by the adjustment value according to the adjustment value. You may That is,
for each equalizer, an adjustment value optimized for each earphone or headphone may be held
and used appropriately.
[0033]
According to this, for example, the user corrects the adjustment value by the process of FIG. 4
using the headphone 2 for the “Jazz” equalizer, and stores the corrected adjustment value in
association with the equalizer and the headphone 2 Then, the user can specify "jazz" as the
equalizer to be used, and specify the identification information of the headphone 2 as the
electroacoustic transducer to be used, and the user and the headphone 2 can be optimized. It is
possible to carry out reproduction with a stable frequency characteristic.
[0034]
Similarly, the survey result by the improvement processing in FIG. 3 and the adjustment value of
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the frequency characteristic based on the survey result are stored in association with the
identification information of the electroacoustic transducer used in the survey, and then the
survey stored By appropriately using the result and the adjustment value, it may be possible to
easily obtain frequency characteristics suitable for the electroacoustic transducer to be used.
[0035]
Also, in the above description, by outputting the test tone of each frequency at a predetermined
level (steps 31 and 41) and accepting the input as to whether or not it could be heard, it is
unique to the user and headphones in use. Although the frequency characteristic is examined,
alternatively, test tones of each frequency may be outputted while changing the level, and it may
be examined whether or not it is possible to listen at a plurality of required levels.
For example, if there is a user's input indicating that the test tone could not be heard, or if it is
considered that the user could not hear the test tone (steps 34 and 44), the sound emission level
of the test tone is increased by a predetermined value. Repeat the action of accepting the input
whether the user was able to hear it again, investigate to what level the user was able to listen
when it was increased, and adjust the frequency characteristic and the adjustment value of the
preset equalizer based on the result Correction may be performed.
[0036]
Further, although not mentioned in the above description, the identification information stored in
the headphone or the speaker may be readable by making the headphone terminal four-wire
type.
According to this, it is possible to automatically store and read out the corrected adjustment
value and the frequency-specific adjustment value of the equalizer associated with the
identification information of the above-mentioned electroacoustic transducer. For example, just
by connecting a headphone to a music player, the identification information is read out from the
headphone, and using this identification information, the adjustment value of the equalizer
optimized for the headphone and the adjustment value of the frequency characteristic are read
out and used. be able to.
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[0037]
It is a front view of the music player concerning one embodiment of the present invention. It is a
block diagram which shows the structure of the music player of FIG. It is a flowchart which
shows the frequency characteristic improvement process in the music player of FIG. It is a
flowchart which shows another example of the frequency characteristic improvement process in
the music player of FIG.
Explanation of sign
[0038]
1: Music player 2: 2: Headphones 3: 3: Speakers 4: 4: headphone jack 11: processing unit 12:
memory 13: display unit 13a: display screen 14: operation unit 14a: operation key 15: voice
Output unit, 16: USB interface.
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