JP2010087591

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DESCRIPTION JP2010087591
To adjust the sound emitted by the sound emitting means for the purpose different from the
improvement of the sound quality. A speaker device emits an adjustment sound, and a
microphone picks up the adjustment sound. The analysis unit 330 of the reproduction device
300 calculates the adjustment value based on the collection result of the adjustment sound.
When the sound information representing the sound on which the information is superimposed
is supplied, the adjustment unit 120 of the speaker device 100 adjusts the sound information
according to the adjustment value. The adjustment performed by the adjustment unit 120 is
performed for the purpose of more reliably transmitting the watermark information
superimposed on the sound. For example, the sound pressure level of the frequency band on
which the watermark information is superimposed is increased. It is. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a technique for adjusting a sound to be emitted.
[0002]
Various techniques are known for adjusting (correcting etc.) sound information for the purpose
of improving sound quality (see, for example, Patent Document 1).
Patent No. 2740584
08-05-2019
1
[0003]
An object of the present invention is to adjust the sound emitted by the sound emitting means for
the purpose different from the improvement of the sound quality.
[0004]
The speaker device according to the present invention is acquired by acquisition means for
acquiring sound information representing a sound on which information is superimposed by a
certain superposition method, and an adjustment value according to the superposition method of
the sound information, and acquired by the acquisition means A sound emitting means for
emitting a sound according to the sound information, and an adjusting means for adjusting the
sound emitted by the sound emitting means according to the adjustment value acquired by the
acquiring means.
[0005]
The speaker device according to the present invention further includes a calculation unit that
calculates the adjustment value based on a collection result of a predetermined adjustment
sound, wherein the sound emission unit emits the adjustment sound, and the acquisition unit is
configured to You may employ ¦ adopt the structure which acquires the adjustment value
calculated by the calculation means.
Further, in the speaker device according to the present invention, the sound information has
information superimposed on sound in a certain frequency band, the sound emitting means
includes first and second sound emitting means, and the adjusting means is Even if the first
sound emitting means is made to emit sound in the frequency band on which the information is
superimposed, and the second sound emitting means is adjusted to suppress sound emission of
the sound in the frequency band. Good.
[0006]
The present invention may be configured as an information transmission system including a
speaker device and a reproduction device.
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In this case, the speaker device at least includes the sound collection means, and the
reproduction device at least includes the calculation means. At this time, the adjustment means
may be provided in either the speaker device or the reproduction device. Further, the present
invention provides an information transmission system that transmits information by emitting a
sound on which information is superimposed, and a receiving device that receives the
information by collecting the emitted sound. It may be configured as a communication system.
[0007]
According to the present invention, by adjusting the sound emitted by the sound emitting means,
it is possible to make transmission of information superimposed on the sound more reliable.
[0008]
First Embodiment FIG. 1 is a diagram showing a configuration of an information transmission
system according to a first embodiment of the present invention.
The information transmission system 10 superimposes information on sound by so-called
acoustic watermarking and transmits it. That is, the sound generated by the information
transmission system 10 includes, in addition to the information intended to be directly heard (the
sound itself), the information not intended to be directly heard (the information superimposed on
the sound). There is. Information superimposed on sound and transmitted, that is, watermark
information, is acquired as sound in a receiving device (not shown) and acquired by extracting
information from the sound. Therefore, the receiving device includes sound collection means for
collecting the sound emitted from the information transmission system 10, and extraction means
for extracting the watermark information from the sound according to the superimposing
method by the information transmission system 10.
[0009]
Although the watermark information superposing method is not particularly limited, for example,
among modulation methods using a sound wave as a carrier wave, an amplitude modulation
method, a phase modulation method or the like can be applied. In the present embodiment, a
superposition method is adopted in which the watermark information is superimposed by
making the amplitude of the sound in a predetermined frequency band different according to the
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information.
[0010]
The information transmission system 10 includes a speaker device 100, a microphone 200, and a
reproduction device 300. The speaker device 100 emits a sound according to the sound
information supplied from the reproduction device 300. The microphone 200 picks up the sound
emitted from the speaker device 100, and supplies sound information representing the picked-up
sound to the reproduction device 300. The reproduction device 300 supplies, to the speaker
device 100, sound information for emitting sound in the speaker device 100, and supplies, to the
speaker device 100, an adjustment value obtained by analyzing the sound information supplied
from the microphone 200. The playback device 300 may be an input / output device such as an
amplifier. Also, the microphone 200 may double as the sound collecting means in the abovedescribed receiving apparatus.
[0011]
The sound information supplied by the reproduction device 300 includes sound information on
which the watermark information is superimposed and sound information representing the
adjustment sound emitted to calculate the above-described adjustment value. The adjustment
sound is a sound emitted to obtain a transfer characteristic of sound by the speaker device 100,
and is, for example, a sound whose frequency changes continuously according to time (so-called
sweep sound). In the following, sound information representing the adjustment sound is referred
to as adjustment sound information and is distinguished from other sound information.
[0012]
The playback apparatus 300 includes a command supply unit 310, a sound generation unit 320,
an analysis unit 330, and an output unit 340. The command supply unit 310 generates a
command that triggers generation of the adjustment sound, and supplies this to the sound
generation unit 320 and the analysis unit 330. The command supply unit 310 may generate a
command in response to an operation by a remote control device (so-called remote control), or
may generate a command at a determined timing (when power is turned on or at a
predetermined time interval). The sound generation unit 320 supplies sound information to the
output unit 340. The sound generation unit 320 may be supplied from outside and may be
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supplied with sound information superimposed with watermark information, and may be
supplied with adjustment sound information according to a command from the command supply
unit 310. In response to a command from the command supply unit 310, the analysis unit 330
analyzes the sound information collected by the microphone 200, and calculates an adjustment
value. The analysis unit 330 calculates an adjustment value according to the watermark
information superimposing method. In the following, sound information collected by the
microphone 200 is referred to as collection information and is distinguished from other
sound information. The output unit 340 includes an output terminal and the like connected to
the speaker device 100, and supplies sound information and an adjustment value.
[0013]
In addition, when the superposing method of the watermark information is determined in
advance, the analysis unit 330 calculates an adjustment value according to the superposing
method. On the other hand, when the watermark information superimposing method is selected
from a plurality of methods, the command may include data identifying the superimposing
method, and the analysis unit 330 may calculate the adjustment value based on the command.
That is, the user may designate the superposition method with the remote control device.
Similarly, the sound generation unit 320 may not always generate the same adjustment sound,
but may be configured to be able to supply a plurality of types of adjustment sound information
according to the superimposing method represented by the command. In this case, the command
supplied to the analysis unit 330 may include data for identifying the adjustment sound emitted
at this time.
[0014]
The speaker device 100 is connected to the reproduction device 300, and includes an input unit
110, an adjustment unit 120, and a speaker 130. The input unit 110 is means for acquiring the
sound information and the adjustment value from the reproduction device 300, and includes an
input terminal or the like for acquiring each. The adjustment unit 120 acquires the sound
information and the adjustment value, performs adjustment so that the sound emitted by the
speaker 130 changes in accordance with the adjustment value, and supplies the adjusted sound
information to the speaker 130. The speaker 130 converts sound information into sound waves
and emits the sound.
[0015]
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The configuration of the information transmission system 10 of the present embodiment is as
described above. Under this configuration, the information transmission system 10 emits the
sound on which the information is superimposed. The sound emitted from the information
transmission system 10 is collected by the receiving device, and the watermark information is
separated and extracted. This information may be associated with the emitted sound or may not
be associated with the emitted sound.
[0016]
In addition, the information transmission system 10 emits an adjustment sound as needed, and
performs adjustment based on collected sound information that is a result of collecting the
adjustment sound. The adjustment performed here is to change the sound information on which
the watermark information is superimposed so that the sound emitted by the speaker device 100
becomes a sound that is easy to separate the watermark information. Such adjustment is
performed as follows.
[0017]
The analysis unit 330 obtains the frequency characteristic of the sound emitted from the speaker
device 100 based on the collected sound information. The analysis unit 330 calculates an
adjustment value representing an instruction to change the sound in the frequency band, when
the frequency band on which the watermark information is superimposed among the frequency
characteristics satisfies a predetermined condition. Here, the predetermined condition is, for
example, a case where the sound pressure level of the frequency band of interest falls below a
predetermined threshold, or a case where the sound pressure level of the frequency band is
relatively smaller than other frequency bands, etc. It is.
[0018]
FIG. 2 is a diagram illustrating frequency characteristics of sound represented by collected sound
information. In the figure, the horizontal axis is the frequency of sound and the vertical axis is the
sound pressure level of sound. At this time, assuming that the frequency band on which the
watermark information is superimposed is the band A1 shown in the figure, the analysis unit 330
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calculates an adjustment value representing an instruction to increase the sound pressure level
of the band A1. The adjustment performed at this time is to adjust the sound pressure level to
compensate for the shortage.
[0019]
The adjustment value of the present embodiment can be represented by the ratio of sound
pressure level for each frequency before and after adjustment. FIG. 3 is a diagram conceptually
showing the adjustment value. In the figure, the horizontal axis is frequency, and the vertical axis
is the ratio of sound pressure levels. For example, when the adjustment value represents the
characteristic shown in FIG. 3A, the sound to be emitted is the sound pressure level of the band
A1 larger than that of the other bands, and the adjustment value is as shown in FIG. When the
characteristic shown is expressed, the sound pressure level of the band A1 is smaller than that of
the other bands. On the other hand, when the adjustment value represents the characteristic
shown in FIG. 3C, the emitted sound does not change before and after the adjustment.
[0020]
Note that the adjustment referred to here is sufficient as long as the sound pressure level of the
focused band becomes relatively larger than the sound pressure levels of other bands before and
after the adjustment. Therefore, the analysis unit 330 may calculate an adjustment value to
reduce the sound pressure level of another band without changing the sound pressure level of
the focused band. Also, the amount of change in sound pressure level may be a constant level
regardless of the sound collection result, or may be a different level depending on the magnitude
of the sound pressure level in the band of interest.
[0021]
The adjustment unit 120 acquires the adjustment value calculated by the analysis unit 330 as
described above, and when the sound information on which the watermark information is
superimposed is supplied, the sound information is adjusted according to the adjustment value,
and the speaker is Supply to At this time, the adjustment unit 120 performs adjustment to
change the sound pressure level of a part of the frequency band of the sound represented by the
sound information. In addition, the adjustment part 120 does not adjust with respect to sound
information (namely, adjustment sound information), when the speaker 130 emits an adjustment
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sound.
[0022]
The information transmission system 10 of this embodiment can make the transmission of the
watermark information more reliable by performing the above operation. According to the
information transmission system 10, the sound pressure level in the frequency band on which
the watermark information is superimposed is changed relatively larger than the sound pressure
level in the other frequency bands by performing adjustment based on the collected sound
information. Can reduce the possibility of errors because the separation and extraction of
watermark information can not be performed accurately. That is, the information transmission
system 10 according to the present embodiment adjusts the sound emitted by the speaker device
100 to reduce the rate of occurrence of an error in the transmission of the watermark
information.
[0023]
In addition, the information transmission system 10 according to the present embodiment picks
up the sound emitted from the speaker device 100, and performs adjustment based on the
collected sound information as the collected sound result, according to the situation at each time.
It is possible to make adjustments. For example, the information transmission system 10
performs adjustment in a situation where it is considered that the possibility of an error is high
based on the sound collection result, but not in a situation where it is considered that the
possibility of an error is low. It is also possible to do so. Furthermore, when performing the
adjustment, the information transmission system 10 can also make the degree of the adjustment
different according to the sound collection result.
[0024]
Second Embodiment FIG. 4 is a diagram showing a configuration of an information transmission
system according to a second embodiment of the present invention. In the figure, the same
reference numerals as in the first embodiment are given to components having the same main
functions as those in the first embodiment. The information transmission system 20 of the
present embodiment has the same configuration as the information transmission system 10 of
the first embodiment except that the speaker device 100a includes a plurality of speakers (131
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and 132). However, the operation performed by the speaker device 100 a and the reproduction
device 300 is different from that of the first embodiment, as there are a plurality of speakers.
[0025]
The speaker device 100 a emits sound at different timings by the speaker 131 and the speaker
132 when emitting the adjustment sound. That is, the period in which the speaker device 100a
emits a sound is divided into a first period in which the speaker 131 emits a sound and a second
period in which the speaker 132 emits a sound. The microphone 200 picks up sound in each
period, and supplies, to the reproduction apparatus 300, first sound pickup information
corresponding to the first period and second sound pickup information corresponding to the
second period.
[0026]
The analysis unit 330 calculates an adjustment value based on the first and second sound
collection information. The adjustment unit 120 adjusts the sound to be emitted by the speaker
131 and the sound to be emitted by the speaker 132 based on the adjustment value. The
speakers 131 and 132 respectively emit sound in a mode according to the adjustment by the
adjustment unit 120. As in the first embodiment, the adjustment in the present embodiment
includes one that suppresses the sound pressure level in addition to the one that compensates for
the shortage of the sound pressure level.
[0027]
FIG. 5 is a diagram illustrating frequency characteristics of sound represented by the first and
second collected sound information. In the figure, F1 shows the frequency characteristic
corresponding to the first collected sound information, and F2 shows the frequency
characteristic corresponding to the second collected sound information. That is, in this example,
the speaker 131 is a speaker that emits the low frequency side sound, and the speaker 132 is a
speaker that emits the high frequency side sound.
[0028]
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In the case shown in FIG. 5, assuming that the frequency band on which the watermark
information is superimposed is the band A1 shown in the figure, the sound of this band can be
emitted from both the speakers 131 and 132. In this case, the analysis unit 330 makes an
adjustment value representing an instruction to relatively reduce the sound pressure level of the
band A1 for one of the speakers 131 and 132 and relatively increase the sound pressure level of
the band A1 for the other. calculate. Ideally, it is desirable that the analysis unit 330 cut the
sound pressure level of the band A1 so that the sound of the band A1 can not be heard for the
one side (the side where the sound pressure level is relatively decreased). The analysis unit 330
may not change the sound pressure level before and after the adjustment on the other side (the
side where the sound pressure level is relatively increased).
[0029]
When the adjustment is performed as described above, the crossover frequency (the frequency at
which F1 and F2 cross) which is determined by the frequency characteristic of the speaker 131
and the frequency characteristic of the speaker 132 changes. Then, even if the frequency band in
which the watermark information is superimposed is a band in which sound can be emitted by
both of the speakers 131 and 132, only one of the speakers can emit sound. Therefore, in the
frequency band in which the watermark information is superimposed, the sound emitted by the
speakers 131 and 132 interferes with the other to act as noise, reducing the possibility of
causing an error in extraction of the watermark information. It will be.
[0030]
The speaker that suppresses the sound of the frequency band on which the watermark
information is superimposed may be either of the speakers 131 and 132. For example, a speaker
used to transmit watermark information may be determined in advance, or a unit (such as a
button) for selecting the speaker may be provided in the speaker device 100a. Alternatively, the
adjustment sound may be emitted by each speaker, and a speaker that emits the sound of the
frequency band on which the watermark information is superimposed most favorably may be
used for transmitting the watermark information. In this case, the reproduction device 300 can
identify each speaker, and the analysis unit 330 may supply information identifying the speaker
used to transmit the watermark information together with the adjustment value.
[0031]
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The example shown in FIG. 5 is the case where the frequency characteristics of the speakers 131
and 132 are different, but in the information transmission system 20, the speakers 131 and 132
may have the same frequency characteristics. Even in this case, the speaker device 100a may
reduce the error occurrence rate by emitting the sound pressure level of the frequency band on
which the watermark information is superimposed only with a specific speaker and suppressing
the sound pressure level with another speaker. it can. The speaker device 100a may
simultaneously suppress not only the frequency band on which the watermark information is
superimposed, but also the sound pressure level of the band in the vicinity thereof. For example,
in the speaker device 100a, only one of the speakers 131 and 132 may emit sound, and the other
may not emit sound at all during a period in which the watermark information is superimposed
on the sound information.
[0032]
[Modifications] The present invention can be implemented in a mode different from the
embodiment described above. The following modification is an example of a modification
applicable to the present invention. In addition, these modifications may be implemented
combining each as needed.
[0033]
The speaker device according to the present invention may be configured to include a part of the
configuration of the above-described playback device 300 inside. For example, the speaker
device according to the present invention may be provided with a configuration (that is,
calculation means) corresponding to the analysis unit 330, or may be provided with storage
means for storing adjustment sound information. In addition, when the speaker device includes
the calculation unit, the speaker device itself may include a unit (such as an input terminal) that
acquires the collected sound information.
[0034]
The speaker device according to the present invention may be adjusted without depending on the
collection result of the sound emitted by the device itself. For example, in the case where there is
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only one sound emitting means, when the frequency band on which the watermark information is
superimposed is determined in advance, the sound pressure level of that frequency band may be
increased regardless of the sound collection result. The adjustment performed in this way
emphasizes the sound pressure level of the band in which the watermark information is
superimposed to be larger than the sound pressure level of the other band, regardless of whether
the sound pressure level is insufficient is there.
[0035]
The information transmission system according to the present invention may have a
configuration corresponding to the adjustment unit 120 (i.e., adjustment means) in the
reproduction device instead of the speaker device. In this way, the present invention can be
implemented using a normal speaker device having no adjustment means.
[0036]
In the present invention, the adjustment target is not limited to the sound pressure level. The
target of adjustment in the present invention affects the transmission of watermark information,
and may be, for example, phase or group delay. Further, for example, a plurality of adjustment
targets may be provided in such a manner as to adjust the sound pressure level and the phase.
[0037]
In the configuration of the second embodiment described above, a plurality of adjustment units
120 may be provided so as to have a one-to-one relationship with the speakers. In this case, as
shown in FIG. 6, the analysis unit 330 calculates adjustment values corresponding to each of the
adjustment units 121 and 122, and supplies the calculated adjustment value to the
corresponding adjustment unit 121 or 122. The number of speakers is not limited to two and
may be more. Moreover, a speaker may comprise not only the structure provided in multiple
numbers in the same speaker apparatus but the speaker apparatus which each became
independent. That is, this is a configuration in which a plurality of speaker devices are connected
to one reproduction device 300.
[0038]
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When the above-described microphone 200 doubles as a sound collection means in the receiving
apparatus that receives the watermark information, there may be a case where the error
occurrence rate can be lower than that in the case other than that (when the sound collection
means is separate). is there. This is because, if the microphone 200 doubles as the sound
collecting means of the receiving device, adjustment can be performed in consideration of the
acoustic characteristics of the environment where the receiving device is installed and the sound
collecting characteristics of the sound collecting means of the receiving device. is there.
[0039]
The information transmission system according to the present invention is configured to use a
predetermined sound on which predetermined watermark information is superimposed as a test
adjustment sound, and calculate an adjustment value based on a collection result of the
adjustment sound. It is also good. In this case, the information transmission system according to
the present invention includes means for extracting the watermark information from the
collected sound information representing the adjustment sound for test, and if the watermark
information can not be extracted correctly, an error does not occur. Analyze and calculate
adjustment values. The information transmission system according to the present invention may
repeatedly execute such a test operation and continue to calculate the adjustment value until an
error does not occur. The information transmission system according to the present invention
may include means for acquiring an extraction result from the above-described receiving device,
instead of the means for extracting watermark information from the adjustment sound
information.
[0040]
The figure which shows the structure of the information transmission system of 1st Embodiment
The figure which illustrates the frequency characteristic of the sound which the sound collection
information represents which illustrates the adjustment value notionally The figure which shows
the structure of the information transmission system of 2nd Embodiment The figure which
illustrates the frequency characteristic of the sound which the 2nd sound collection information
represents. The figure which shows the structure of the modification of the information
transmission system of 2nd Embodiment.
Explanation of sign
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[0041]
10, 20, 30 ... information transmission system, 100, 100a, 100b ... speaker device, 110 ... input
unit, 120, 121, 122 ... adjustment unit, 130, 131, 132 ... speaker, 200 ... microphone, 300 ...
reproduction device, 310: command supply unit, 320: sound generation unit, 330: analysis unit,
340: output unit
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