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JPH0644294

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0644294
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus such as a radio cassette player with a CD player (so-called CD radio
cassette player), and more particularly to the improvement of the speaker arrangement and the
reproduction sound quality. .
[0002]
2. Description of the Related Art As a conventional sound reproducing apparatus such as a CD
radio cassette player, there is one disclosed in, for example, JP-A-56-6592. Referring to FIG. 5, a
cassette player 102 is provided at the center of the front of the apparatus main body 100, and
speakers 104 and 106 are provided on the left and right, respectively. Further, a CD player 108
is provided on the top of the cassette player 102, and a radio unit 110 is provided on the side
thereof. Furthermore, a display unit 112 is provided on the front, so that the order of music
pieces, the reception channel, and the like are appropriately displayed. Further, a carry handle
114 for carrying, an antenna 116 and the like are provided on the upper surface.
[0003]
In the radio cassette player, the apparatus main body 100 can be rotated relative to the base 118
in the direction of the arrow FQ or FR shown in the figure. When the listener issues an operation
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instruction using a remote control (not shown), the radio wave output from the remote control is
received by the device body 100. In the device body 100, rotational driving of the device body
100 in the directions of arrows FQ and FR is performed by utilizing the fact that the sensitivity of
the radio wave is maximized when the direction of the receiving antenna is the direction of the
remote control. Therefore, when the listener 120 is located on the side of the acoustic device
instead of the front, the device body 100 rotates in the direction of the arrow FR, and the
speakers 104 and 106 are directed to the listener 120. become. Although this example is an
example in which the apparatus main body is driven in the left and right direction, there are also
cases in which the apparatus is driven in the vertical direction.
[0004]
However, in such a conventional technique, it is necessary to perform exceptional acoustic effects
such as powerful and three-dimensional sound reproduction simply by changing the direction of
the speaker. You can not The present invention focuses on these points, and an object thereof is
to provide an acoustic reproduction device capable of generating various sound fields having a
three-dimensional effect.
[0005]
SUMMARY OF THE INVENTION The present invention provides an acoustic reproduction
apparatus having a main speaker for reproduction on the front of the apparatus, which is
rotatably provided on the back side of the apparatus main body at a distance from the main
speaker. Characteristics of at least one signal processing circuit, and speaker drive means for
rotating the surround speaker to a rotation angle corresponding to the selected surround
speaker, and any surround operation mode for the surround speaker. And circuit characteristic
setting means for changing the characteristic corresponding to the operation mode.
[0006]
According to the present invention, the rotating surround speaker is provided on the rear side
remote from the main speaker on the front side of the device.
Therefore, the listener can hear the sound output from the surround speaker after a delay
corresponding to the distance from the sound output from the main speaker. In addition, since
the characteristics of the signal processing are also changed according to the rotation of the
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surround speaker, reproduction with a three-dimensional effect corresponding to various sound
fields is performed.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the sound
reproducing apparatus according to the present invention will be described below with reference
to the attached drawings. FIG. 1 shows an embodiment in which the present invention is applied
to a CD radio cassette player. In the figure, (A) is a front view and (B) is a plan view. In these
figures, a tape cassette unit 12, a radio unit 14, and a display unit 16 are provided at the central
portion of the CD radio cassette main body 10. Further, main speakers 18L and 18R are provided
on the left and right of the CD radio cassette main body 10 respectively. Furthermore, a CD
player unit 20 is provided on the top of the CD radio cassette main body 10, and a carry handle
22 is provided around the same. Each of the above components is the same as a commerciallyavailable CD radio cassette player.
[0008]
Next, in the present embodiment, surround speakers 24L and 24R are respectively provided on
the back side of the CD radio cassette main body 10 and fixed to the rotary shafts 26 and 28. The
rotary shafts 26, 28 are rotatably supported by a suitable bearing (not shown) with respect to the
CD radio cassette main body 10. For example, a drive device using a worm gear or a worm wheel
(for example, Japanese Patent Application No. 34464) is configured to perform its rotational
drive. In the present embodiment, the surround speakers 24L and 24R are respectively
symmetrically rotated in the directions of arrows F1 and F2 shown in FIG. In addition, as shown
to the figure (B), rotation angle (theta) is defined on the basis of the state which faced the front.
[0009]
Next, the configuration of the reproduction drive circuit will be described with reference to FIG.
In the figure, the output side of the source 30 such as the tape cassette unit 12, the radio unit 14
and the CD player unit 20 described above is connected to a GE (Graphic Equalizer) pattern /
volume setting unit 32, and the output side is a crosstalk Connected to cancel circuit 34
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[0010]
The output side of the crosstalk cancellation circuit 34 is connected to the main speakers 18L
and 18R via the main amplifier 36 at one end. The output side of the crosstalk cancellation
circuit 34 is connected to the surround speakers 24L and 24R via a series circuit of a level
controller 38, a DSP (Digital Signal Processor) 40, and a surround amplifier 42 on the other side.
Although these circuits are provided for each of the L and R channels, only one of the channels is
illustrated because of the same configuration.
[0011]
The characteristics of the GE pattern / volume setting unit 32, the crosstalk cancellation circuit
34, the level controller 38, and the DSP 40 among the above-described units are controlled by
the microcomputer 44. Further, the microcomputer 44 is also configured to issue a drive
instruction of the drive device 46 that rotates the surround speakers 24L and 24R and a display
instruction of the mode display unit 48 that displays the operation content. Furthermore, the
operation instruction is performed by the mode instruction unit 50. The mode instructing unit 50
corresponds to various switches, remote controls, and the like provided in the CD radio cassette
main body 10.
[0012]
The microcomputer 44 includes a mode discriminating unit 44A, a memory 44B, a display
instructing unit 44C, a drive instructing unit 44D, and a characteristic setting unit 44F. The
operation mode discriminated by these and the discriminated operation are Control of speaker
driving, circuit characteristic setting, and display corresponding to the mode is performed.
[0013]
The crosstalk cancellation circuit 34 cancels the crosstalk sound as shown in FIG. 3 to perform
the movement of the sound image well.
For example, as shown to the same figure (A), it is assumed that the sound of the left speaker PL
is heard by the listener's left and right ears EL, ER as shown by arrows FA, FB. In this case, due to
the crosstalk sound indicated by the arrow FB, the sound image is fixed in front of the listener as
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indicated by the diagonal lines. Therefore, as shown in FIG. 6B, when the correction signal is
output from the right speaker PR as shown by the arrow FC and thereby the crosstalk sound of
the arrow FB is canceled, it is shown by the arrow FD in FIG. Sound image moves to the left, and
the sound field expands as shown by
[0014]
Next, with reference to Table 1, the operation mode of the surround in the present embodiment
will be described. These operation modes are set in five stages according to the degree of the
angle θ of the surround speakers 24L, 24R. First, when the angle θ is 0 ° , it is a normal
stereo reproduction mode. Next, in the case of the "disco" mode in which the angle θ is "8 °",
the signal delay amount of the DSP 40 becomes D1, and the GE pattern / volume setting unit 32
displays the equalizer frequency characteristics ("EQf characteristics" in Table 1) ) Is f1 shown in
Table 2. Here, the delay of the signal corresponds to the wide and narrow of space. In a narrow
space, the time difference between the sound heard directly to the listener from the speaker and
the sound reflected from the wall or ceiling is small. However, in the case of a large space, the
time difference becomes large. In this disco mode, a relatively small signal delay produces
powerful sound field formation in which bass and treble are emphasized.
[0015]
【0015】
[0016]
【0016】
[0017]
Next, in the "hole" mode in which the angle θ is "16 °", the signal delay amount of the DSP 40
becomes D2 (> D1), and the GE pattern / volume setting unit 32 becomes the frequency
characteristic f2 of the equalizer .
In this hall mode, the middle and high tone range is emphasized, and the atmosphere of the
concert hall is reproduced.
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Next, in the BGM mode in which the angle θ is 24 ° , the signal delay amount of the
DSP 40 is D3 (> D2), and the GE pattern / volume setting unit 32 has the frequency characteristic
f3 of the equalizer. In this BGM mode, the bass and treble range are somewhat suppressed to
diffuse the sound field.
[0018]
Next, in the case of the "dome" mode in which the angle θ is "40 °", the signal delay amount of
the DSP 40 is D4 (> D3), and the GE pattern / volume setting unit 32 is the frequency
characteristic f4 of the equalizer. . In this dome mode, the thickness of the midrange is
emphasized to form a large space sound field. The data of each operation mode is stored in
advance in the memory 44B of the microcomputer 44, and the data corresponding to the
operation mode determined by the mode determination unit 44A is read and instructed to each
unit. ing.
[0019]
Next, the operation of the above-described embodiment will be described with reference to FIG.
The listener selects an appropriate operation mode as desired, and instructs the mode instruction
unit 50. For example, in the case of the normal stereo mode, as shown in FIG. 4A, both of the
main speakers 18L and 18R and the surround speakers 24L and 24R are directed to the front as
indicated by the arrow F3.
[0020]
Next, it is assumed that the listener instructs the disco mode by the mode instructing unit 50. In
the microcomputer 44, when it is determined by the mode determination unit 44A that the disco
mode is set, the corresponding data is read from the memory 44B. Then, in the display
instructing section 44C, the mode display section 48 instructs that to that effect, and the disco
mode is displayed. In the drive instructing unit 44D, the drive device 46 instructs the drive
device 46 to rotate at 8 ° corresponding to the disco mode, and the drive device 46 rotates
them so that the angle θ of the surround speakers 24L and 24R becomes 8 °. FIG. 4B shows
the rotated state, in which the main speakers 18L and 18R face the front indicated by the arrow
F3, whereas the surround speakers 24L and 24R face the directions of the arrows F4 and F5. It
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will be.
[0021]
Further, the characteristics of the GE pattern / volume setting unit 32, the crosstalk cancellation
circuit 34, and the DSP 40 are shown in Tables 1 and 2 based on the data read from the memory
44B by the characteristic setting unit 44E of the microcomputer 44. It is set as shown in. In
addition, the level of the level controller 38 is also set corresponding to the instruction of the
listener. Therefore, the output of the source 30 is reproduced as a powerful sound field in which
bass and treble are emphasized in a relatively narrow space. The same applies to the other
modes. For example, in the case of the hole mode, the drive device 46 rotates the surround
speakers 24L and 24R so that the angle θ becomes 16 °. After rotation, as shown in FIG. 4C,
the surround speakers 24L and 24R are directed in the directions of the arrows F6 and F7.
[0022]
By the way, in the present embodiment, the main speakers 18L, 18R and the surround speakers
24L, 24R are not at the same plane position, and the surround speakers 24L, 24R are disposed
with a depth at the rear. In the case of the CD radio cassette as in this embodiment, since the CD
player 20 is present, the CD radio cassette body 10 has a considerable width W (see FIG. 1B)
from the size thereof. Therefore, a considerable distance exists between the surround speakers
24L and 24R attached to the back side of the main body 10 and the main speakers 18L and 18R
on the front side. According to the prototype device of this embodiment, a distance of about 17
cm exists.
[0023]
For this reason, the listener hears the sound output from the surround speakers 24L and 24R
after a delay corresponding to a distance of 17 cm with respect to the sounds output from the
main speakers 18L and 18R. If this distance is converted to time, it will be about 450 μsec.
Therefore, a very deep three-dimensional sound field is formed. Since the signal delay and
frequency characteristics in each mode and the spread of the sound due to the change in angle of
the surround speakers 24L and 24R act on this, it is possible to enjoy various sounds.
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[0024]
For example, in the case of the disco mode, a powerful sound field in which the sound of bass
treble is emphasized is formed. In the case of the hall mode, the midrange is emphasized and the
atmosphere like a concert hall can be enjoyed. In the BGM mode, the sound field spreads and the
sound can be spread over the entire room. Furthermore, in the case of the dome mode, a vast and
wide sound field can be formed.
[0025]
The present invention is not limited to the above embodiment, and includes, for example, the
following. (1) In the above embodiment, the characteristics of the equalizer and the like are set
according to the angle of the surround speaker, but which signal processing element is to be set
to which characteristic may be appropriately selected as necessary Good. The same applies to the
angles of the surround speakers. There may be provided a mode which can be arbitrarily set by
the listener. (2) In the above embodiment, the surround speaker is rotated to the left and right as
viewed from the listener, but may be rotated in the vertical direction as well. (3) The above
embodiment is an application of the present invention to a CD radio cassette player, but is also
applicable to an audio component device, a television device and the like. (4) In addition, the
number of main speakers and surround speakers may be set as needed.
[0026]
As described above, according to the sound reproducing apparatus of the present invention, the
surround speaker is rotatably disposed at a position behind the main speaker as viewed from the
listener, and Since the rotation angle of the speaker and the characteristic of the signal
processing circuit are changed in correspondence with each other, it is possible to form a sound
field having various three-dimensional effects and perform powerful acoustic reproduction.
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