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JP2005073202

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DESCRIPTION JP2005073202
PROBLEM TO BE SOLVED: To expand a sweet spot where an effect of a virtual sound field can be
obtained. SOLUTION: A first speaker driver, a second speaker driver arranged so that its vibration
axis is at an angle of about 180 degrees with respect to a vibration axis of the first speaker
driver, and a sound image at an arbitrary position A three-dimensional sound source reproducing
unit is provided which reproduces a three-dimensional sound source signal generated by the
three-dimensional sound source generation circuit for performing localization from the first
speaker driver and the second speaker driver. [Selected figure] Figure 1
Speaker for 3D sound source reproduction
[0001]
The present invention relates to a speaker for reproducing a three-dimensional sound source for
three-dimensionally reproducing a sound source using a virtual sound image localization control
technique.
[0002]
In recent years, products equipped with virtual sound field localization technology capable of
localizing sound images also behind the listener using only the front two speakers of the listener
have been proposed.
In this virtual sound field localization technology, it is necessary to set various filter
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characteristics on the assumption that the listener's ear exists at a specific position.
[0003]
Therefore, when the listener is at a position away from this specific position, the effect of the
virtual sound field is significantly reduced, and the sound can not be localized at the originally
intended location, and the sweet spot is extremely narrow. The Also, usually, the vibration axis of
the speaker is installed facing the direction of the listener. Therefore, even if the distance from
the speaker is the same, if the height of the listener's ear is different, the effect of the virtual
sound field is reduced by deviating from the vibration axis of the speaker. On the other hand,
although it is possible to widen this sweet spot, the effect of the virtual sound field has become
thin and has a trade-off relationship.
[0004]
In order to solve the problems described above, the present invention provides a first speaker
driver and a second speaker driver arranged such that the vibration axis is at an angle of about
180 degrees with respect to the vibration axis of the first speaker driver. And stereo sound
source reproducing means for reproducing a stereo sound source signal generated by the stereo
sound source generation circuit for localizing the sound image at an arbitrary position from the
first speaker driver and the second speaker driver.
[0005]
According to the present invention, it is possible to provide a speaker for reproducing a threedimensional sound source that can enlarge a listening point of a virtual sound source, which has
been a pinpoint so far, and allow a plurality of listeners to simultaneously listen to a virtual
sound image. is there.
[0006]
Hereinafter, the best embodiment according to the present invention will be described with
reference to the attached drawings.
[0007]
1 to 4 are respectively a front view, a rear view, a left side view and a right side view of the
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speaker 1.
Speaker drivers 2 and 3 are disposed on the longitudinal axis of the speaker 1 having an oval
outer shape.
The vibration axes of the speaker drivers 2 and 3 are at an angle of 180 degrees to each other,
and are attached in a back-to-back manner.
On the back of the speaker 1, various operation units 4 such as a power switch, a playback
button, and a stop button are disposed.
[0008]
FIG. 5 shows a circuit block for creating a processed three-dimensional sound source to be
incorporated into the speaker 1. It is possible to use various things, such as music or the sound of
a bird's song or stream of a small stream, as the original sound source. The stereo outputs of the
original sound source 10 are input to the filters 11 to 14, respectively.
[0009]
Here, filter characteristics are given to the filters 11 to 14 such that when reproduced from the
speaker drivers 2 and 3, the reproduced sound is an impulse response localized at each specific
position. Generally, this filter coefficient is called head-related transfer function (HRTF), and
convolution processing is performed. The HRTF filter circuit 31 is configured by the filters 11 to
14 and the adding circuits 15 and 16.
[0010]
The output of the adding circuit 15 for adding the output signals of the filters 11 and 13 is input
to the digital filters 21 and 22, and the output of the adding circuit 16 for adding the output
signals of the filters 12 and 14 is for digital filters 23 and 24. It has been input. The outputs of
the digital filters 21 and 23 are added by the adding circuit 25, and the outputs of the digital
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filters 22 and 24 are added by the adding circuit 26.
[0011]
The digital filters 21 to 24 and the adder circuits 25 and 26 constitute the crosstalk cancellation
circuit 32, and originally, the output signal of the adder circuit 15 to be in the left ear is
prevented from entering the right ear, and the adder to be in the right ear It functions to prevent
the output signal of the unit 16 from entering the left ear. A sound source can be localized at an
intended position by the three-dimensional sound source generation circuit including the HRTF
circuit 31 and the crosstalk cancellation circuit 32. Therefore, it is also possible, for example, to
localize the sound of the stream of Ogawa so as to envelop the listener. Also, by changing the
constant of the filters 11 to 14 continuously, it is possible to move the localization position of the
reproduced sound, for example, it is also possible to move the sound of the car from the front to
the rear of the listener. The outputs of the adding circuits 25 and 26 are recorded in the memory
27.
[0012]
FIG. 6 shows a circuit block diagram incorporated inside the speaker 1. The microcomputer 5
controls the memory 27 by the operation of the operation unit 4, and the memory 27 selects and
outputs one of the plurality of three-dimensional sound sources processed as described above.
The output signals are amplified by the amplifiers 28 and 29 and then emitted from the speaker
drivers 2 and 3 at an angle of 180 degrees to each other.
[0013]
Although the HRTF circuit 31 and the crosstalk cancellation circuit 32 both set the filter
coefficient on the assumption that the listener is positioned at a specific position, the vibration
axes of the speaker drivers 2 and 3 are at an angle of 180 degrees. When 1 is placed on a desk, if
there is a listener at the same height as the desk, or even if the listener is directly above the desk,
the virtual sound if the distance from the speaker 1 is the same The place effect does not change.
In other words, the sweet spot of the speaker 1 is not a point, and as shown in FIG. 7, the effect is
the same if it is on and around the line 6 of any radius L centered on the vibration axis of the
speaker drivers 2 and 3 It is. Of course, this radius L can be adjusted arbitrarily.
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[0014]
Further, due to the arrangement of the speaker drivers 2 and 3 described above, the emitted
sound from each driver does not go directly to the listener direction, but goes to the side. As a
result, even if the sound is not subjected to virtual sound image localization processing, the
sound image can be localized at a distance from the speaker drivers 2 and 3, and the drawback
that the distance between the speaker drivers 2 and 3 is narrow can be compensated.
[0015]
The external shape of the speaker 1 in the present invention is not limited to the oval shape as in
the above-described embodiment, but may be any shape such as a normal rectangular shape.
[0016]
Further, in the above-described embodiment, since the three-dimensional sound source 10 is
created in advance by the three-dimensional sound source creation circuit including the HRTF
circuit 31 and the crosstalk cancellation circuit 32 and recorded in the memory 27, the speaker 1
is expensive. The effect of not requiring a circuit element is exerted.
However, the present invention is not limited to this, and it is possible to perform signal
processing of a normal original signal in real time by a three-dimensional sound source creation
circuit and reproduce this signal by a speaker driver. Various aspects can be taken without doing.
[0017]
The front view of the speaker 1. The rear view of the speaker 1. The left view of the speaker 1.
The right view of the speaker 1. FIG. 2 is a block diagram for creating a sound source subjected
to virtual localization processing. The circuit block diagram of the speaker 1. The figure which
shows the sweet spot of the speaker 1. FIG.
Explanation of sign
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[0018]
1 Speaker 2, 3 Speaker driver 4 Operation part 5 Microcomputer 10 Sound source 27 Memory
31 HRTF circuit 32 Cross talk cancellation circuit
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