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JP2003125482

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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
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DESCRIPTION JP2003125482
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
audio bass arrays, and more particularly to modular bus arrays.
[0002]
SUMMARY OF THE INVENTION An important object of the present invention is to provide a
modular bus array with preset physical configuration, and preset signals for processing
parameter settings.
[0003]
SUMMARY OF THE INVENTION According to the present invention, an audio loudspeaker array
system comprises a first loudspeaker module and a first loudspeaker module configured and
arranged to emit a sound wave in response to an audio signal. It has two speaker modules.
The sound waves emitted by the first speaker module and the sound waves emitted by the
second speaker module are combined to form a radiation pattern. The audio array further
comprises a positioning system for positioning the first bus module relative to the second bus
module at one of a plurality of fixed predetermined distances, and a source of audio signals for
receiving audio signals. An audio signal input terminal electronically coupling the loudspeaker
array, and an audio signal processing unit electronically coupling the audio signal input terminal
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to the first bus module and the second bus module. The audio signal processing device processes
the audio signal and transmits the audio signal to a first loudspeaker module and a second
loudspeaker module. An audio signal processor applies a first signal processing parameter value
to an audio signal transmitted to a first loudspeaker module and a second signal processing to an
audio signal transmitted to a second loudspeaker module A parameter value is configured and
arranged to apply, such that the first parameter value and the second parameter value differ by a
parameter value difference. The audio loudspeaker further comprises a processing parameter
selection device comprising a plurality of preset indicators, each corresponding to a
predetermined parameter value difference. The predetermined parameter value difference and
one of the plurality of predetermined distances correspond to a predetermined radiation pattern.
[0004]
In another aspect of the invention, an audio loudspeaker array comprises a first module
comprising an electro-acoustic transducer and an enclosure having a width, depth, height, a
second module comprising a loudspeaker and an enclosure. And a positioning device (positioner)
for positioning the first module at a fixed distance from the second module, the fixed distance
being greater than twice the minimum of width, depth and height .
[0005]
In yet another aspect of the invention, an audio loudspeaker array emitting bass (bus)
frequencies comprises: a first module comprising an electroacoustic transducer and an enclosure;
a second module comprising a loudspeaker and an enclosure A module and a positioning device
for positioning the enclosure of the first module at a fixed distance from the enclosure of the
second module, this fixed distance being half of the shortest wavelength sound intended to be
emitted by the array Longer than.
[0006]
Other features, objects, and advantages will be apparent from the following detailed description
with reference to the drawings.
[0007]
DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, and more
particularly to FIG. 1, there is shown a schematic diagram of the bass (bus) playback portion of
an audio system according to the present invention.
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A signal source (hereinafter referred to as an audio signal source) 10 of the bass audio (audible)
signal (for example, a mixer) is connected to the audio signal processing device (processor) 12.
Audio signal processor 12 is connected to bus array 16 via amplifier 14.
The bus array 16 comprises a first bus module 22-1 and a second bus module 22-2, which
modules are horizontally moved (displaced) relative to each other by the brackets 18 and 20.
Held in position.
[0008]
Audio signal source 10 may be a conventional professional mixer. System controller 12 may be a
Panaray® System Digital Controller, which is commercially available from Bose Corporation of
Framingham, Mass. The amplifier 14 may be a conventional amplifier having at least two input
terminals and at least two output terminals. Bus modules 22-1 and 22-2 are Panaray (R) MB4
Modular Bass Loudspeakers (each with four 6 inch drivers, 15.0 inches deep, 9.0 inches wide,
26.0 inches Enclosure dimensions, which can be substantially omnidirectional at 300 Hz or less),
and the brackets 18 and 20 can be MB4 Endfire 2X Bass Array Brackets, all of which are
available from Massachusetts, It is commercially available from Bose Corporation in Framingham.
[0009]
In operation, the audio signal source transmits an audio signal to the audio signal processor 12.
Audio signal processor 12 decodes the audio signal to produce a processed audio signal that may
include a bass audio signal. The audio signal processor outputs this bass audio signal as two
channels, and different signal processing parameter values are applied to the two channels.
Parameters to which different processing values may be applied include amplitude equalization
(magnitude equalization), phase equalization, time delay, phase, amplitude, or a combination of
these parameters. For the sake of brevity, the invention will be described using time delay as a
parameter where different values apply to the two channels. Different values of the time delay
(which may be zero) can be added to the two channels, whereby the two channels can be
temporally separated by a time delay ΔT. The amplifier 14 amplifies the two channels or bass
audio signals and outputs the amplified audio signals (still still separated in time by the time
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delay ΔT) to the bus modules 22-1 and 22-2. The bus modules 22-1 and 22-2 convert audio
signals into sound waves. The resulting sound field is shown in FIG. Here, 0 degrees is shown in
the direction 17 connecting the acoustic centers of the bus modules 22-1 and 22-2 and 90
degrees is orthogonal to the direction 17 in the horizontal plane It is shown in the direction 19.
[0010]
Referring to FIG. 2, a polar plot showing the radiation pattern taken at 160 Hz of the audio
system of FIG. 1 with a time delay ΔT of 1.71 ms and a center-to-center distance d between bus
modules of 23 inches is shown. This distance d is longer than half of the shortest wavelength
(300 Hz, about 3.8 feet wavelength) that is intended to be regenerated and more than twice the
width of the enclosure (minimum linear dimension) Too long. This radiation pattern is mainly
determined by the distance d between the bus modules and the value of the time delay ΔT. If
one or both of the bus modules is not omnidirectional, the radiation pattern can also be
influenced by the relative orientation of the bus modules. If the bus module is directional in the
radiated frequency range, the brackets 18 and 20 can be adapted to fix the orientation of the two
modules as well as the spacing.
[0011]
The value of the time delay ΔT may be input manually or, more conveniently, by use of a preset
indicator at the system controller 12. In one embodiment of the present invention, one of the
preset indicators is preprogrammed to delay the audio signal for bus module 22-1 relative to the
audio signal for bus module 22-2, thereby Radiation responsive to the audio signal from the bus
module 22-2 is to be emitted 1.7 anms later than the corresponding radiation from the bus
module 22-1. Thus, if the user desires a maximum acoustic output of 116 dB SPL with the
radiation pattern shown in FIG. 2, the user can assemble the bus array as shown in FIG. 1 and
select a preset setting.
[0012]
Referring to FIG. 3, a control panel of system controller 12 is shown. The preset indicator can be
selected by turning on the "preset" button 30 and also by turning on the up indicator 32 and the
down indicator 34. Other system controllers may have various preset selection configurations,
such as separate programmable manual push buttons, touch screens, or display screens using
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selector indicators such as a computer mouse.
[0013]
The audio system according to the invention is advantageous as it comprises a bus array capable
of emitting a predetermined radiation pattern with less setup time than conventional bus arrays.
The bus array according to the invention is particularly useful in acoustic systems for portable
applications that need to provide a large amount of acoustic output and need to be quickly
activated. The components of this array can be transported and stored separately. The array can
be assembled quickly with the correct physical configuration, and the correct time delay can be
easily entered without the user having to record or store the appropriate time delay interval.
[0014]
Referring to FIG. 4, a schematic diagram of the bass reproduction portion of a second audio
system according to the present invention is shown. A signal source (hereinafter referred to as an
audio signal source) 10 of a bass audio signal such as a mixer is connected to the audio signal
processing device 12. Audio signal processor 12 is connected to bus array 16 'via amplifiers 141 and 14-2. The bus array 16 'comprises a first bus module 22-1, a second bus module 22-2, a
third bus module 22-3, and a fourth bus module 22-4. These modules are held together in the
correct position of the horizontal line by the brackets 18 'and 20'.
[0015]
Audio signal source 10 may be a conventional professional mixer. System controller 12 may be a
Panaray® System Digital Controller, which is commercially available from Bose Corporation of
Framingham, Mass. The amplifiers 14-1 and 14-2 may be conventional amplifiers having at least
two input terminals and at least two output terminals. Bus modules 22-1, 22-2, 22-3, and 22-4
may be Panaray® MB4 Modular Bass Loudspeakers, which are substantially omnidirectional at
300 Hz or less. , 18 'and 20' may be MB4 Endfire 4X Bass Array Brackets, all of which are
commercially available from Bose Corporation of Framingham, MA.
[0016]
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Referring to FIG. 5, the time delay .DELTA.T between the bus modules 22-1 and 22-2 is 2.15 ms,
the time delay .DELTA.T between the bus modules 22-2 and 22-3 is 2.00 ms, and the bus The
radiation pattern taken at 160 Hz of the audio system of FIG. 4 with a time delay .DELTA.T
between modules 22-3 and 22-4 of 2.15 ms and a center-to-center distance d between bus
modules of 29 inches. The polar plot shown is shown. This radiation pattern is mainly
determined by the distance d between the bus modules and the value of the time delay ΔT. If
one or both of the bus modules is not omnidirectional, the radiation pattern can also be
influenced by the relative orientation of the bus modules.
[0017]
As described in the description of FIG. 3, one of the preset buttons is preprogrammed to apply
the appropriate time delay, resulting in the radiation pattern of FIG. The embodiments of FIGS. 4
and 5 illustrate further advantages of the present invention. All components of the audio system
of FIGS. 1-3 (except for brackets 18 and 20) are included in the audio system of FIGS. 4 and 5,
and the audio system of FIGS. It can be easily transformed into the audio system of FIGS. 1 to 3
by replacing 'and 20' with brackets 18 and 20 and by selecting a preset setting on the system
controller 12.
[0018]
Referring now to FIG. 6, a schematic diagram of the bass reproduction portion of a third audio
system according to the present invention is shown. A signal source (hereinafter referred to as an
audio signal source) 10 of a bass audio signal such as a mixer is connected to the audio signal
processing device 12. The audio signal processing unit 12 is connected to the bus array 16 '' via
the amplifiers 14-1 and 14-2. The bus array 16 '' comprises a first bus module 22-1 and a second
bus module 22-2 which are vertically displaced from one another by the brackets 18 '' and 20 ''
It is held in a relationship of
[0019]
Referring now to FIG. 7, a polar plot showing the vertical radiation pattern taken at 160 Hz of the
audio system of FIG. 6 with a time delay ΔT of zero and a vertical distance d between bus
modules of 45 inches is shown. It is shown. Horizontal dispersion is virtually omnidirectional.
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This vertical radiation pattern is mainly determined by the distance d between the bus modules
and the value of the time delay ΔT. If one or both of the bus modules is not omnidirectional, the
vertical radiation pattern may also be influenced by the relative orientation of the bus modules.
[0020]
The components of the audio system of FIGS. 6 and 7 are identical to the components of the
audio system of FIGS. 1-3 with the exception of the brackets 18 and 20. The audio system of
FIGS. 1-3 is shown in FIGS. 6 and 7 by replacing brackets 18 and 20 with brackets 18 '' and 20 ''
and by selecting an appropriate preset setting on system controller 12. It can be easily
transformed into 7 audio systems.
[0021]
As described above in the description of FIG. 1, the present invention uses parameters other than
time delay, such as signal amplitude, phase delay or phase response (frequency dependent
amplitude), or the logic of these parameters It can be implemented by using any of the
combinations. The preset indicator corresponds, for example, to a specific time delay difference
between audio signals transmitted to the two modules, and also to different equalization patterns
applied to the two audio signals transmitted to the two modules . Radiation patterns due to time
delay differences, equalization pattern differences, and distances (as well as orientation (if the
module is not omnidirectional)) are determined by computer simulation or actual measurements.
The use of a single preset indicator setting is particularly useful when used to specify more than
one parameter setting, as the value of multiple parameters can be fixed by selecting a single
preset setting There is sex.
[0022]
It will be apparent to those skilled in the art that numerous uses and developments of the specific
devices and techniques disclosed herein can be made without departing from the inventive
concepts. Accordingly, the present invention is intended to embrace each and every novel feature
disclosed herein and novel combinations of those features, and is to be limited only by the claims
and the spirit thereof. It should be interpreted.
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[0023]
Brief description of the drawings
[0024]
1 is a schematic diagram of an audio system according to the present invention.
[0025]
2 is a polar plot of the radiation pattern of the embodiment of FIG.
[0026]
3 is a front view of the control panel of the system controller of the embodiment of FIG.
[0027]
4 is a schematic view of a second embodiment of the present invention.
[0028]
5 is a polar plot of the radiation pattern of the embodiment of FIG.
[0029]
6 is a schematic view of a third embodiment of the present invention.
[0030]
7 is a polar plot of the radiation pattern of the embodiment of FIG.
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