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JPH06205496

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DESCRIPTION JPH06205496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker apparatus, and more particularly to a directivity control technique of the
loudspeaker apparatus.
[0002]
2. Description of the Related Art One of the characteristics for evaluating the performance of a
loudspeaker is directivity. The directivity is the property that the magnitude of the sound
pressure differs depending on the direction. This directivity is generally not as good as broad,
and the required pattern differs depending on the use of the speaker, in other words, the service
range of the speaker. For example, in the case of audio, a wide directivity is often required, and in
the case of a loudspeaker, narrow directivity is required so that only a specific direction is
emitted for preventing howling and the like.
[0003]
On the other hand, the factor determining the directivity of the speaker is, in the case of a single
speaker unit, the structure of the speaker unit itself, such as whether it is a cone or horn shape,
or the cone of a diaphragm in the case of a cone speaker There is a depth of Moreover, it radiates
only in a specific direction by the speaker of the linear arrangement type (the so-called tone zone
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type) using a plurality of speaker units. In any case, the directivity of the speaker is determined
by the physical structure or arrangement of the speaker unit itself. However, they often receive
the required directivity. Therefore, a speaker system has been developed in which the directivity
pattern is electrically controlled using a digital filter (Japanese Patent Laid-Open Nos. 2-329798
and 3-197864). And FIG. 6 shows a block circuit of such a speaker system.
[0004]
In FIG. 6, reference numerals 10, 12 and 14 respectively indicate a digital filter group, an
amplifier group and a sneaker group. Digital filter group 10 includes n digital filters (for example,
FIR (Finite Impulse Response) filters) 16-1, 16-2, ..., 16-n, and amplifier group 12 includes n
amplifiers 18-1, 18 The speaker group 14 includes n full-range speaker units 20-1, 20-2, ..., 20-n.
The digital filters 16-1, 16-2, ..., 16-n in the digital filter group 10 are speakers via the amplifiers
18-1, 18-2, ..., 18-n in the amplifier group 12, respectively. The speaker units 20-1, 20-2, ..., 20-n
in the group 14 are connected. Further, to the digital filters 16-1, 16-2,..., 16-n in the digital filter
group 10, a common input signal is supplied from the common input terminal IN.
[0005]
In the above configuration, the directivity of the speaker units 20-1, 20-2,..., 20-n is controlled by
adjusting the filter coefficients of the digital filters 16-1, 16-2,. Thus, the directivity as an entire
speaker group 14 can be obtained.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker
apparatus capable of emitting sound from a speaker with desired directivity by using the abovementioned directivity control technology of the speaker.
[0007]
According to a first aspect of the present invention, there is provided a plurality of speaker units
arranged at least in a straight line, and digital filters respectively connected to the plurality of
speaker units, and each of the digital filters is provided. A plurality of audio signals are input in
common, and the characteristic of each of the digital filters is changed with respect to the
plurality of audio signals, so that the corresponding speaker unit has desired directivity for each
of the plurality of audio signals. Configured to be
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[0008]
A second invention comprises a plurality of at least linear speaker units and a digital filter
respectively connected to the plurality of speaker units, and one audio signal is commonly input
to each of the digital filters. The corresponding speaker unit has two or more directivity different
from each other with respect to the audio signal by changing each of the digital filters so as to
have two or more different characteristics with respect to the audio signal. Configured to be
[0009]
The third invention comprises a plurality of linear speaker units and digital filters connected to
the speaker units at both ends of the plurality of speaker units, and audio signals are input to the
digital filters at both ends, respectively. At the same time, audio signals are directly input to the
other speaker units, and by changing the characteristics of each of the digital filters, the speaker
units at both ends are configured to have desired directivity.
[0010]
In the first aspect of the invention, the characteristics of each digital filter can be changed for a
plurality of audio signals, and the corresponding speaker units have desired directivity for the
plurality of audio signals. ing.
[0011]
In the second aspect of the invention, the characteristics of each digital filter can be changed so
that each digital filter has two or more different characteristics for one audio signal, and the
corresponding speaker unit is one audio. It is made to be two or more desired directivitys with
respect to the signal.
[0012]
In the third invention, the characteristics of the digital filter can be changed for the audio signal,
and the speaker units at both ends have desired directivity for the audio signal.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of
the present invention will be described based on the drawings.
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In the following embodiments, the plurality of speaker units are linearly arranged (linear array),
but the plurality of speaker units may be planarly arranged in the longitudinal direction and the
lateral direction.
[0014]
First, FIG. 1 shows a speaker device according to a first embodiment of the present invention, (A)
is an explanatory view thereof, and (B) shows a block circuit thereof.
As shown in FIG. 1B, the speaker device has a first signal input terminal IN1 and a second input
terminal IN2, and the input terminals IN1 and IN2 are digital audio signal processors
(functioning as digital filters) DSAP) It is connected to the speaker units SP1 to SPm through the
amplifiers DF1 to DFm and the amplifiers A1 to Am in series.
In the above configuration, the digital filters DF1 to DFm, the amplifiers A1 to Am, and the
speaker units SP1 to SPm are referred to as a digital filter group 22, an amplifier group 24, and a
speaker unit group 26, respectively.
[0015]
A traffic signal 30 from a controller (CPU) 28 is connected to each of the digital filters DF1 to
DFm in the digital filter group 22.
The controller 28 sets the filter coefficient data αhi specific to each of the digital filters DF1 to
DFm through the traffic light 30.
The filter coefficient data αhi is stored in the memory 32. The filter coefficient data αhi stored
in the memory 32 is sequentially set in the digital filters DF1 to DFm by the support operation of
the input keyboard 34.
[0016]
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The speaker units SP1 to SPm are linearly arranged at equal intervals in one direction to
constitute a speaker array.
The speaker units SP1 to SPm preferably have the same physical characteristics, for example, the
same specifications (diameter, bottom resonance frequency, diaphragm mass, etc.) defining the
characteristics of the speaker units.
The reproduction frequency range of the speaker unit, that is, whether to use a woofer, a
squawker, a tweeter, or a full range type may be appropriately selected according to the
application.
Although not shown, whether each speaker unit is individually housed in an enclosure or
attached to a single continuous baffle plate or wall or the like differs depending on the
application of the speaker device, and therefore it may be configured as necessary. .
[0017]
The digital filters DF1 to DFm are realized by a digital signal processor (DSP), and are constituted
by a general linear impulse response (FIR) filter. Although the hardware configuration is not
shown, an arithmetic unit (ALU: arithmetic logic unit) that performs arithmetic operations and
logic operations, which are central to signal processing, and a sequencer (a program counter, an
instruction register, To exchange data with the outside, including a decoder (including a ROM)
that stores necessary programs, a RAM (random access memory) that stores data, and a resist
that temporarily stores data And an I / O port, and a bus connecting the above elements.
[0018]
The configurations (the number of taps and the coefficient of the multiplier) of the digital filters
DF1 to DFm are the same. In the above configuration, when the first signal and the second signal
are input to the digital filters DF1 to DFm, the digital filters DF1 to DFm generate the two input
audio signals (the first signal and the second signal). Parallel processing is performed to make
the speaker unit group 26 have desired beam directivity. That is, as shown in FIG. 1A, from the
speaker unit group 26, the first signal 36 and the second signal 38 are emitted in beams in
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different directions.
[0019]
Next, FIG. 2 shows a speaker apparatus according to a second embodiment of the present
invention. In FIG. 2, the beam-like directivity from the speaker unit group 26 is the same as in the
first embodiment of FIG. 1, but the first signal 36 and the second signal 38 are respectively wall
40, It is reflected at 42 and is directed to a listener (listening point) 44, whereby a surround
system is configured.
[0020]
In FIG. 2, the first signal 36 and the second signal 38 are reflected by the left and right walls 40
and 42, respectively, to constitute the surround system on the left and right. It can also be a
reflection.
[0021]
Next, FIG. 3 shows a speaker apparatus according to a third embodiment of the present
invention, in which (A) is an explanatory view thereof, (B) shows its block circuit, and (C) is
another DASP. An input example is shown.
[0022]
In FIG. 3B, the block circuit of the speaker device is the same as the block circuit of the first
embodiment of FIG. 1B, but the following points are different.
That is, the surround signals SL and SR and the sensor signal C are input as audio signals to the
digital filters DF1 to DFm, and the digital filters DF1 to DFm receive the input audio signals SL,
SR, C. Processing is performed to obtain the directivity shown in FIG. 3 (A).
The emitted two surround signals SL and SR are reflected by the walls 44 and 46, respectively.
[0023]
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In FIG. 3B, in addition to the surround signals SL 1 and SR 2, a signal obtained by adding the
surround signals SL 1 and SR 2 by the adder 48 may be input as sensor signals to the digital
filters DF1 to DFm.
[0024]
Next, FIG. 4 shows a speaker apparatus according to a fourth embodiment of the present
invention.
In FIG. 4, in the speaker unit group 26, a plurality of speaker units SP1 to SPm are linearly
arranged. A signal subjected to directivity control processing is input only to the speaker units
SP2 and SPm-1 other than the both ends among the plurality of speaker units SP1 to SPm. For
example, the L signal SL may be input to the speaker unit SP1 and the R signal SR may be input
to the speaker unit SPm, or the L signal SL and the R signal SR may be simultaneously input to
the speaker unit SP1 and the speaker The L signal SL and the R signal SR may be simultaneously
input to the unit SPm. The directivity control as described above is performed on the other
speaker units SP2 to SPm-1. Further, L signals SL and R signals subjected to directivity control
are respectively added to the speaker units SP1 to SPm-1, and another signal not subjected to
directivity control to one or two speakers in the center (for example, the center Add the signal).
[0025]
Next, FIG. 5 shows a speaker apparatus according to a fifth embodiment of the present invention.
In FIG. 5, the directivity of each of the speaker units SP1 to SPm in the speaker unit group 26 is
controlled so as to have two types of directivity for one audio signal. That is, the first signal 50
has an upward directivity and is reflected by the ceiling 52 so as to be able to reach the listener
in the rear seats 54 to 54, while the second signal is 56 is directed forward so as to be able to
reach the listener in front seats 58-58. The first signal 50 and the second signal 56 are the same
audio signal, and the listeners in the front seats 58 to 58 and the listeners in the rear seats 54 to
54 are the same audio signals. You can listen to
[0026]
In the present invention, if the coefficients of the multipliers of the digital filters are made the
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same, the coefficient data can be sent simultaneously to the digital filters, so that the directivity
can be changed (data transfer becomes easy). Furthermore, only one table may store the filter
coefficients of the digital filter.
[0027]
Further, in the present invention, the digital filter may be configured by an FIR filter, or may be
configured by an infinite impulse response (IIR).
[0028]
In the present invention, the filter coefficient of the digital filter may be calculated by the nonlinear optimization method (Japanese Patent Application No. 3-197864), or in the present
invention, a speaker device (for example, not using the optimization method) It is applicable also
to Unexamined-Japanese-Patent No. 2-329798.
[0029]
As described above, according to the present invention, by using the directivity control
technology of the speaker, it is possible to emit sound from the spiece with a desired directivity.
[0030]
Brief description of the drawings
[0031]
1 shows a speaker device according to a first embodiment of the present invention, (A) is an
explanatory view thereof, (B) is a block circuit diagram thereof.
[0032]
2 is an explanatory view of a speaker device according to a second embodiment of the present
invention.
[0033]
3 shows a speaker device according to a third embodiment of the present invention, (A) is its
explanatory diagram, (B) is its block circuit diagram, (C) is a diagram showing another input
example of DASP. is there.
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[0034]
4 is an explanatory view of a speaker device according to a fourth embodiment of the present
invention.
[0035]
5 is an explanatory view of a speaker device according to a fifth embodiment of the present
invention.
[0036]
6 is a block circuit diagram of a conventional speaker device.
[0037]
Explanation of sign
[0038]
22 ... digital filter group 24 ... amplifier group 26 ... speaker unit group DF1 to DFm ... digital filter
A1 to Am ... amplifier SP1 to SPm ... speaker unit
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