JPH0615099

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DESCRIPTION JPH0615099
[0001]
BACKGROUND OF THE INVENTION Among loudspeaker devices mainly used for video and audio
reproduction devices, particularly pivotable loudspeaker devices
[0002]
2. Description of the Related Art A technology for changing the direction of a speaker and
changing the sound field is known, for example, by rotating a speaker unit or the like to obtain a
sense of reality suitable for each music, such as classical music and popular music. It is done. As
shown in FIG. 10, in the conventional speaker rotating means, for example, the speaker unit 100
is housed in a spherical chamber (chamber) 101, and a recess 102 fitted with the spherical
chamber 101 is provided in the speaker cabinet 103. It is known that the spherical chamber 101
is pivotally supported by a pivot shaft 104 provided at 103 and the speaker unit 100 is manually
turned.
[0003]
However, when the speaker is rotated by a motor, a sufficient change in the sound field can not
be obtained because the rotation speed is substantially constant. Therefore, an object of the
present invention is to provide a sound field control device which can obtain a highly realistic
sound effect even in a relatively narrow place and can obtain a natural comfortable change of
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sound field.
[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is
directed to a fluctuation signal generating means for generating fluctuation in the output and a
rotational speed or rotational acceleration according to the output of the fluctuation signal
generating means. And the fluctuation control means for causing fluctuation in the speaker
rotation means.
[0005]
The fluctuation signal generating means may be constituted by a 1 / f random number generator
which outputs a random value inversely proportional to the frequency as a digital value.
[0006]
[Operation] By giving fluctuation to the rotational speed or rotational acceleration of the speaker,
the sound field is further changed as compared with the case where no fluctuation is given.
[0007]
By using a random number inversely proportional to the frequency as the fluctuation signal, it is
possible to give the listener a natural comfortable change in the sound field.
[0008]
Embodiments of the present invention will now be described with reference to the attached
drawings.
In FIG. 1, the sound field control device 1 includes a speaker rotation means 2, a motor 21 driven
by a drive signal output from the speaker rotation means 2, and a rotation type speaker unit 22
which is rotated by the motor 21. And consists of
Also, the motor 21 and the pivotable speaker unit 22 are accommodated in the fixed chamber
23.
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[0009]
The speaker rotating means 2 is a microcomputer (hereinafter referred to as a microcomputer)
corresponding to fluctuation control means.
3), a motor drive unit 4 for generating a signal for driving the motor according to an output
signal of the microcomputer 3, a voltage converter 5 for converting the direction of the rotary
speaker unit 22 into a voltage, and The A / D converter (hereinafter referred to as A / D) converts
the output signal of the digital signal into a digital signal and inputs the digital signal to the
microcomputer 3.
And 6).
[0010]
The microcomputer 3 further includes a rotation mode switching switch 7 for switching the
rotation mode to either the rotation mode or the arbitrary rotation mode, a speed setting unit 8
for setting the rotation speed, and the like. The remote control receiver 9 and remote control
transmitter 10 for remote control of mode switching and speed setting, a fluctuation signal
generation unit 11 for generating a fluctuation signal, and a fluctuation switch 12 for turning a
fluctuation signal on or off.
[0011]
In the present embodiment, the pivotable speaker unit 22 is configured to be pivoted, but the
speaker cabinet 30 (speaker device) containing the speaker unit 22 and the other speaker units
is pivoted. You may
[0012]
Next, as shown in FIGS. 2 and 3, the speaker unit 22 is attached to a substantially hemispherical
pivoting chamber 24. The pivoting chamber 24 is mounted on the pivoting shaft 25 as an axis.
Supported by 23
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The rotation chamber 24 has an arc gear 26a on the outer peripheral surface, and is connected
to the rotation shaft 21a of the motor 21 via circular gears 26b to 26h engaged with the gear
26a.
With this configuration, when the motor 21 rotates, the rotation chamber 24 rotates via the
gears 26b to 26h and 26a, and the orientation of the speaker unit 22 changes.
[0013]
Incidentally, the pivoting chamber 24 is provided with directional indicators 27a to 27c, and for
example, light emitting diodes (LEDs) 27d to 27f visually indicate inner, front and outer
directions respectively via the directional indicators 27a to 27c. May be displayed.
[0014]
FIG. 4 shows an example in which the speaker cabinet 30 containing the pivotable speaker unit
22 is disposed as a pair on the left and right.
That is, when the speaker unit 22L of the left (L) speaker cabinet 30L and the speaker unit 22R
of the right (R) speaker cabinet 30R are directed rightward as shown in FIG. 6A, the sound field is
moved from left to right. Similarly, when the respective units 22L and 22R are turned to the left,
the sound field can be moved from right to left.
[0015]
Further, as shown in FIG. 6B, when the respective units 22L and 22R are directed inward, the
sound field can be narrowed. On the other hand, as shown in FIG. The sound field can be
broadened by turning 22R outward.
[0016]
Next, the operation of the speaker rotating means 2 will be described.
In this embodiment, although the case where the rotation mode switching switch 7 is switched to
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the "always" side will be described, the "arbitrary" side can be similarly described. First, the case
where the fluctuation switch 12 is off will be described. First, desired rotational speed is input to
the microcomputer 3 from the speed setting unit 8. In this case, a constant speed may be input,
or a program whose speed changes with time may be input. In the present embodiment,
immediately before and after the speaker unit 22 turns from right to left, the speed is reduced,
and after turning to the left, the speed is gradually increased, and further from right to right The
speed was set to be slow immediately before and after the change in direction. Of course, the
setting is not limited to this setting and can be set arbitrarily.
[0017]
The microcomputer 3 calculates the speed for rotating the motor 21 from the set speed and the
signal indicating the direction of the rotary speaker unit 22 input from the A / D 6, and calculates
this speed data. Input to the motor drive unit 4. The motor drive unit 4 converts the speed data
into an analog voltage to drive the motor 21. Thus, the pivotable speaker unit 22 always pivots at
the speed designated by the microcomputer 3.
[0018]
Next, the case where the fluctuation switch 12 is on will be described. This case corresponds to
the sound field control device of claim 1. When the switch 12 is turned on, constant random
number data is input to the microcomputer 3 from the fluctuation signal generator 11. The
fluctuation signal generator 11 has, for example, a configuration as shown in FIG.
[0019]
Referring to FIG. 5, the fluctuation signal generator 11 is called a white noise generator 11a and
a low pass filter (hereinafter referred to as an LPF). 11b, an integrating circuit 11c, and an A / D
11d. According to this configuration, the low frequency portion of the noise signal generated by
the white noise generator 11a is extracted by the LPF 11b, and when fluctuation is caused in the
speed, integration is performed only once by the integration circuit 11c. On the other hand, in
the case of causing fluctuation in acceleration, the integration circuits 11c are connected in
series in two stages, and the low frequency portion of the noise signal is integrated twice. Then,
the integrated signal is converted into a digital signal by the A / D 11 d and input to the
microcomputer 3 as random number data.
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[0020]
The microcomputer 3 changes the speed or acceleration set by the speed setting unit 8 based on
the random number data. The speed or acceleration to be adjusted is usually not a constant value
because it is based on the random number data. Therefore, according to this configuration, it is
possible to obtain a rich change in the sound field and to further enhance the sense of presence.
[0021]
In the case of causing fluctuation in acceleration, fluctuation occurs with respect to the degree of
velocity change, so that it is possible to obtain a sense of presence different from that in the case
of causing fluctuation in velocity.
[0022]
Next, a sound field control apparatus according to claim 2 will be described.
As shown in FIG. 6, the fluctuation signal generation unit 11 of the sound field control device 1 is
configured by a pink noise generator 11 h, the LPF 11 b, the integration circuit 11 c, and the A /
D 11 d. According to this configuration, the only difference from the fluctuation signal generator
11 of FIG. 5 is that a pink noise generator 11 h is used instead of the white noise generator 11 a.
That is, since the power spectrum (energy per 1 Hz) of the pink noise is in inverse proportion to
the frequency, a so-called 1 / f fluctuation signal can be obtained by using this pink noise. That
is, by changing the speed or acceleration set by the speed setting unit 8 by the microcomputer 3
on the basis of 1 / f random number data output from the A / D 11 d, an effect unique to the 1 /
f fluctuation characteristic is exhibited. Can.
[0023]
The 1 / f fluctuation characteristic is based on the fact that, for example, the feeling of comfort in
the natural world, such as the creaking of a stream or the tide, is considered to have 1 / f
fluctuation. That is, when the frequencies of these sounds that appear to be irregular rhythms are
analyzed, a wave with a long period (a wave with a low frequency) in which the phenomenon
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appears is strong and a wave with a short period is weak. The sound intensity is approximately
proportional to the reciprocal 1 / f of the frequency at which the phenomenon appears. (Modern
mechanical term 91 edition; issued by Nikkei BP)
[0024]
FIG. 7 shows the rotational speed versus time characteristics of the rotary speaker unit 22 when
not controlled by fluctuation, that is, when the fluctuation switch 12 is off. In the present
embodiment, as shown by the characteristic curve P1, a sine curve is obtained. Of course, the
characteristic is not limited to this sine curve, and an arbitrary curve can be used.
[0025]
FIG. 8 shows the rotational speed versus time characteristics when controlled by 1 / f fluctuation,
and fluctuation is irregularly generated as shown by a characteristic curve P2.
[0026]
FIG. 9 shows the rotational acceleration versus time characteristics when controlled by 1 / f
fluctuation, as shown by the characteristic curve P3 but different from the characteristic curve
P2.
By controlling the rotation speed or the rotation acceleration with 1 / f fluctuation as described
above, the degree of change in the sound field can be changed from quantitative to natural and
comfortable.
[0027]
Effect of the Invention The presence feeling is further improved by causing the rotation speed or
the rotation acceleration to fluctuate. In addition, by causing 1 / f fluctuation in the rotation
speed or rotation acceleration, the change of the sound field becomes closer to the sound in the
natural world, and the listener can be given a comfortable realism. On the other hand, since a
highly realistic sound field can be realized with a relatively small number of speaker systems, it
can be used even in a narrow room, which is suitable for cost reduction.
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