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JP2007028401

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DESCRIPTION JP2007028401
An object of the present invention is to simply reduce noise by simply mounting a noise
reduction circuit without requiring complicated operations such as adjustment. A speaker unit
(12) for outputting a voice according to a voice signal, a directional microphone (14) having
directivity in a direction opposite to an output direction of voice by the speaker unit (12), and a
voice input by the directional microphone A noise reduction circuit that converts a signal into an
antiphase signal, delays the antiphase signal with a delay corresponding to the distance between
the speaker unit 12 and the directional microphone 14, combines it with an audio signal, and
outputs it to the speaker unit 12 And an amplifier 16. [Selected figure] Figure 1
Speaker, how to use the speaker
[0001]
The present invention relates to a speaker provided with a circuit for noise cancellation
(reduction), and a method of using the speaker using the same.
[0002]
Conventionally, apparatuses and circuits for performing noise cancellation using antiphase
signals have been considered.
For example, a mobile communication device (such as a mobile phone) is considered that cancels
ambient noise and improves the ease of listening to both the speaker and the listener (see Patent
08-05-2019
1
Document 1).
[0003]
In the portable communication device described in Patent Document 1, an audio signal is input
from a first microphone, while noise and an audio signal are input from a second microphone.
The noise / voice signal from the second microphone is phase-reversed and synthesized with the
voice signal from the first microphone to form a noise signal reduced signal, which is input to the
voice input of the apparatus used. At the same time, noises and phase-inverted speech signals are
synthesized with the speech output signal and output from the speaker to reduce ambient noise.
[0004]
Further, a management device intended to reduce noise in a game arcade has been considered
(see Patent Document 2).
[0005]
The management apparatus described in Patent Document 2 includes a sensor microphone
capable of receiving noise in a game arcade, a speaker capable of uttering, and a reverse phase
circuit generating noise cancellation sound in reverse phase to the received sound at the sensor
microphone. A speaker is provided corresponding to each player, and the noise elimination noise
from the antiphase circuit is uttered through the speaker.
JP-A-9-331377 JP-A-10-43417
[0006]
Thus, in the conventional apparatus capable of noise cancellation, it is an object to reduce
ambient noise. The microphone used for this purpose was omnidirectional so that ambient noise
could be collected.
[0007]
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2
However, in the game arcade described in Patent Document 2, there are a plurality of noise
sources that generate noise. In such a case, in order to effectively reduce the sound from each
noise source, the delay according to the position of each noise source, the sensor microphone,
the speaker, and the player (listener who listens to the sound of the speaker) must be considered.
You must. Therefore, the circuit setting for noise cancellation becomes complicated. In particular,
if the positional relationship with each noise source, the speaker, and the sensor microphone is
not fixed at each place in the game arcade, settings corresponding to each place are required.
[0008]
Also, when using a plurality of speakers, in order to reduce ambient noise, for example, a
microphone is previously installed at the listening position, and the reference sound output from
the speakers is collected to adjust the delay and the like in each speaker. Then, for each speaker,
a noise reduction circuit that performs complex signal processing, such as combining the original
sound with the sound picked up by the microphone and making the phase opposite and
synthesizing it, becomes necessary.
[0009]
The present invention has been made in consideration of the above-described circumstances, and
an object thereof is to mount noise reduction circuits with a simple configuration and effectively
reduce noise without requiring complicated operations such as adjustment. It is an object of the
present invention to provide a speaker that can be used and a method of using the speaker.
[0010]
According to the present invention, there is provided a speaker unit for outputting a voice
according to a voice signal, a microphone having directivity in a direction opposite to the
direction of voice output by the speaker unit, and a voice signal input from the microphone as a
reverse phase signal. A noise reduction circuit is provided, which converts and applies a delay
corresponding to the distance between the speaker unit and the microphone to this reverse
phase signal, combines it with an audio signal input from the outside, and outputs it to the
speaker unit. It is characterized by
[0011]
According to the present invention, a microphone having directivity in the reverse direction to
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the speaker unit is provided, an audio signal input by this microphone is converted into an
antiphase signal, and a delay corresponding to the distance between the speaker unit and the
microphone is obtained. By implementing the noise reduction circuit to be applied, it is possible
to reduce the sound from the sound source located in the directivity direction of the microphone,
that is, the noise source existing in the opposite direction to the sound output direction of the
speaker unit.
The position of the speaker unit and the microphone is fixed, and the circuit configuration can be
simplified by reducing the noise from the noise source in the direction opposite to the direction
of the sound output from the speaker unit. Become.
In addition, since it is sufficient to simply install the speaker so that the noise source is
positioned in accordance with the directivity of the microphone, it is possible to effectively
reduce noise without the need for complicated adjustment and the like.
[0012]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a diagram showing the configuration of the speaker 10 in the present embodiment. The
speaker 10 shown in FIG. 1 is configured by integrating a speaker unit 12, a directional
microphone 14, and a noise reduction circuit / amplifier 16 in a housing.
[0013]
The speaker unit 12 outputs an audio according to the audio signal input through the noise
reduction circuit / amplifier 16. The speaker unit 12 is provided, for example, on the side surface
of the housing.
[0014]
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The directional microphone 14 inputs surrounding sound and outputs a sound signal
corresponding to the sound to the noise reduction circuit / amplifier 16. The directional
microphone 14 has directivity in the opposite direction to the output direction of the sound by
the speaker unit 12. When the housing of the speaker 10 is substantially formed in a rectangular
parallelepiped, the directional microphone 14 is attached to the side surface opposite to the side
surface of the housing where the speaker unit 12 is provided. In the present embodiment, it is
assumed that the speaker unit 12 and the directional microphone 14 are coaxially fixed. In
addition, the directivity change structure which can change directivity can be added to the
directional microphone 14, for example.
[0015]
The noise reduction circuit / amplifier 16 converts an audio signal input by the directional
microphone 14 into an antiphase signal, and applies a delay corresponding to the distance
between the speaker unit 12 and the directional microphone 14 to the antiphase signal. Then, it
is synthesized with an audio signal input from the outside through an audio input terminal (not
shown) provided in the speaker 10 and output to the speaker unit 12.
[0016]
FIG. 2 is a block diagram showing the configuration of the noise reduction circuit / amplifier 16.
As shown in FIG. 2, the noise reduction circuit / amplifier 16 is provided with a delay circuit 20, a
mixer 22, and an amplifier 24.
[0017]
The delay circuit 20 converts the audio signal input from the directional microphone 14 into an
antiphase signal, and adds a delay corresponding to the distance between the directional
microphone 14 and the speaker unit 12 to the antiphase signal. Are output to the mixer 22. Since
the speaker unit 12 and the directional microphone 14 are fixedly arranged, the delay circuit 20
does not require a circuit or process for adjusting the delay, and can be realized with a simple
configuration. In particular, the circuit design is facilitated by coaxially arranging the speaker
unit 12 and the directional microphone 14.
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[0018]
The mixer 22 combines an audio signal input through an audio signal input terminal provided in
the casing of the speaker 10 and a signal generated by the delay circuit 20 and outputs the
combined signal to the amplifier 24.
[0019]
The amplifier 24 amplifies the audio signal output from the mixer 22 and outputs the amplified
audio signal to the speaker unit 12.
[0020]
Next, the operation and effect of the speaker 10 in the present embodiment will be described.
FIG. 3 is a diagram showing the relationship between the sound output direction by the speaker
unit 12 provided in the speaker 10 and the sound collection range by the directional microphone
14. FIG. 4 is a sound collection range when the speaker 10 is viewed from the front. It is a figure
which shows (a background noise muffling range).
[0021]
As shown in FIG. 3, the directional microphone 14 selectively inputs sound in the direction
opposite to the sound output direction of the speaker unit 12.
The directional microphone 14 is attached to the housing so as not to pick up the sound output
from the speaker unit 12.
[0022]
The sound collection range (silence reduction range) by the directional microphone 14 can be,
for example, in the range of 20 ° to 30 ° around the common axis of the speaker unit 12 and
the directional microphone 14. As shown in FIG. 4, the sound collection range (directivity) of the
directional microphone 14 of the speaker unit 12 extends in the back direction of the speaker
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10.
[0023]
The speaker 10 according to the present embodiment can reduce the sound output from the
noise source present in the sound collection range shown in FIGS. 3 and 4. The directivity of the
directional microphone 14 can be set based on, for example, the frequency range of sound
output from the target noise source and the distance to the directional microphone 14. For
example, when the frequency of the sound output from the noise source is relatively high,
narrowing the sound collection range of the directional microphone 14 makes it possible to
reliably reduce the sound from the noise source.
[0024]
The directivity of the directional microphone 14 may be fixed. For example, by providing a
directivity changing structure capable of changing the directivity, a situation in which the
speaker 10 is used (the position of the noise source or the noise source It may be made to be
able to change according to the frequency of sound etc.).
[0025]
The directivity changing structure may be any structure as long as it can change the sound
collection range by the directional microphone 14, and for example, it can be realized by a
tubular member which can expand and contract in the sound collecting direction around the
directional microphone 14. it can.
The sound collection range can be narrowed by extending the cylindrical member, and the sound
collection range can be widened by contracting the same. The directional microphone 14 itself
may have a structure capable of changing the directivity.
[0026]
In this manner, in the speaker 10 according to the present embodiment, the directional
microphone 14 for noise cancellation is directed to the housing in the opposite direction to the
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sound output direction of the speaker unit 12 and disposed in the housing. It is possible to cancel
out the sound from the noise source present in the back direction, and to reduce the background
noise. That is, only the sound corresponding to the audio signal input from the outside through
the audio input terminal can be floated up.
[0027]
In the speaker 10, since the speaker unit 12 and the directional microphone 14 are fixedly
arranged, the delay based on the distance between the speaker unit 12 and the directional
microphone 14 may be fixed, and fine adjustment and the like are unnecessary. Can be realized
with a simple and fixed circuit.
[0028]
FIG. 5 shows an example of a surround system using a plurality of the speakers 10 described
above.
For example, if there is only one noise source, the sound from the noise source can be obtained
by arranging and using the speaker 10 so that the noise source is included in the sound
collection range (silence reduction range) of the directional microphone 14 It can be reduced. On
the other hand, when there are a plurality of noise sources, it may not be possible to include all
noise sources within the sound collection range (silence range) with one speaker 10. In such a
case, it is impossible to reduce the sound from noise sources not included in the sound collection
range (silence range).
[0029]
In such a situation, a plurality of speakers 10 in the present embodiment are arranged around
the listening position, and a plurality of noise sources are included in the sound collection range
(silence range) of any of the speakers 10. It can be reduced.
[0030]
The example shown in FIG. 5 shows a usage method in which a plurality of (five in FIG. 4)
speakers 10a to 10e are arranged around a listening position (indicated by a circle in the figure).
[0031]
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As shown in FIG. 5, by arranging the speakers 10a to 10e around the listening position, the
sound from the noise source located on the background side of the speakers 10a to 10e is
reduced by the respective speakers 10a to 10e. become.
Therefore, at the listening position, the original sound from the speakers 10a to 10e can be
heard while reducing ambient noise.
[0032]
For example, in a place where there are a plurality of noise sources such as game arcades (for
example, game centers), the plurality of speakers 10a to 10e are arranged according to the
position of each noise source to reduce the sound emitted from the noise sources. An acoustic
environment can be provided.
[0033]
In the speaker 10 according to the present embodiment, since the speakers 10a to 10e output
sounds so as to reduce background noise, the speakers 10a to 10e may be installed at any
positions of the plurality of speakers 10a to 10e. There is no need to adjust between them, and
ambient noise can be reduced effectively without complicated operations.
[0034]
In the above description, the single speaker 10 is described, but the present invention can also be
applied to a device that outputs another sound.
For example, FIG. 6 shows an example applied to a loudspeaker 30.
[0035]
A loudspeaker unit 30 shown in FIG. 6 is provided with a speaker unit 32 and a loudspeaker
microphone 36 for inputting a voice for loudspeaker.
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A directional microphone 34 having directivity in the direction opposite to the output direction
of the sound of the speaker unit 32 is provided.
Similarly to the directional microphone 14 in the speaker 10 described above, the directional
microphone 34 has a sound collection range in which the sound output from the speaker unit 32
is not picked up.
[0036]
Inside the loudspeaker 30, an audio signal input from the directional microphone 34 is converted
into an antiphase signal, and this antiphase signal is delayed by a distance corresponding to the
distance between the speaker unit 32 and the directional microphone 34, A circuit for
synthesizing the voice signal input from the microphone 36 for loud sound and outputting it is
mounted.
[0037]
As a result, it is possible to reduce the sound from the noise source within the sound collection
range of the directional microphone 34 and output the sound input from the microphone 36 for
loud sound.
[0038]
In the above description, the speaker unit 12 and the directional microphone 14 are described as
being coaxially fixed and disposed, but the direction of the directional microphone 14 with
respect to the audio output direction of the speaker unit 12 If the direction is the reverse
direction, it does not have to be provided coaxially.
[0039]
Moreover, although it is set as the structure in which the one speaker unit 12 was provided in
the speaker 10, it is also applicable to the speaker of the structure in which the several speaker
unit was provided.
Since the speaker having such a configuration is designed to output voice as a single speaker unit
by a plurality of speaker units, the output direction of the voice is centered on (or near) the
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center of all the plurality of speaker units. The directional microphone 14 may be provided in the
reverse direction.
[0040]
For example, there is a speaker having a configuration in which sound to be output is divided
into a plurality of frequency bands, and a plurality of speaker units corresponding to the
respective frequency bands are provided.
In this case, the noise reduction circuit / amplifier 16 distributes the signal output from the
amplifier 24 according to the frequency band and outputs it to the speaker corresponding to
each frequency band, so the processing in the delay circuit 20 is a speaker unit 12 may be the
same as in the case of one, and the circuit configuration and processing are not complicated.
[0041]
Further, although one directional microphone 14 is provided in the speaker 10, a plurality of
directional microphones 14 may be provided.
[0042]
Further, although FIG. 5 shows how to use the five speakers 10a to 10e arranged around the
listening position, the number of the speakers 10 can be arbitrarily determined.
また。
Not only can a plurality of speakers 10 be installed and used on the same surface (on the floor,
etc.), but it is also possible to use the speakers 10 above or below the listening position. Further,
by arranging the speaker 10 so that the axial direction of the directional microphone 14 is
directed to the noise source, the sound from the noise source can be effectively reduced. Even in
such a method of use, since each speaker 10 outputs sound so as to reduce background noise,
even if each of a plurality of speakers 10 is installed at any position, adjustment between the
speakers 10 is There is no need to
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[0043]
The present invention is not limited to the above embodiment as it is, and in the implementation
stage, the constituent elements can be modified and embodied without departing from the scope
of the invention. In addition, various inventions can be formed by appropriate combinations of a
plurality of constituent elements disclosed in the above embodiment. For example, some
components may be deleted from all the components shown in the embodiment. Furthermore,
components in different embodiments may be combined as appropriate.
[0044]
The figure which shows the structure of the speaker 10 in embodiment of this invention. FIG. 2 is
a block diagram showing the configuration of a noise reduction circuit / amplifier 16 in the
present embodiment. The figure which shows the relationship between the output direction of
the audio | voice by the speaker unit 12 provided in the speaker 10 in this embodiment, and the
sound collection range by the directional microphone 14. FIG. The figure which shows the sound
collection range (background noise muffling range) when the speaker 10 in this embodiment is
seen from a front. An example of the surround system which used two or more speakers 10 in
this embodiment is shown. The figure which shows the example which applied this invention to
the loudspeaker 30. FIG.
Explanation of sign
[0045]
DESCRIPTION OF SYMBOLS 10 (10a-10e) ... Speaker, 12, 32 ... Speaker unit, 14, 34 ... Directional
microphone, 16 ... Noise reduction circuit / amplifier, 20 ... Delay circuit, 22 ... Mixer, 24 ...
Amplifier, 30 ... Loudspeaker.
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