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JP2016527814

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DESCRIPTION JP2016527814
Abstract The array of electroacoustic actuators comprises at least five electroacoustic actuators
(101, 102, 103, 104, 105), which comprise at least two electroacoustic actuators in a first
parallel branch (110a) Are connected in series, and one electroacoustic actuator is connected in
series to the parallel connection by two electroacoustic actuators in the second parallel branch
(110b), and the first parallel branch is connected in parallel to the second parallel branch
Connected in parallel, and their parallel branches (110a, 110b) connected in parallel are
configured to be driven by the actuator amplifier (112), or these electro-acoustic actuators are ,
In the first series branch (110c) at least two Acoustic actuators are connected in parallel, and in a
second series branch (110d), one electroacoustic actuator is connected in parallel to a series
connection by two electroacoustic actuators, and a first series branch is serially connected to a
second series branch The parallel branches (110c, 110d) connected and connected in series are
configured to be driven by the actuator amplifier (112). [Selected figure] Figure 3
Electro-acoustic actuator array and method of manufacturing array
[0001]
The present invention relates to arrangements, and in particular to so-called Bessel weighting
arrangements of electro-acoustic actuators.
[0002]
The loudspeakers of the loudspeaker arrangement, for example a linear arrangement or an area
arrangement, can be controlled in various ways.
03-05-2019
1
European Patent Application Publication No. 0034 844 A1 discloses amplitude / phase weighting
based on function values of first Bessel functions having different orders.
[0003]
A possible example of such an arrangement is shown in FIG. It consists of five individual
loudspeakers, which are marked 1, 2, 3, 4, 5 corresponding to the arrangement, for example a
linear arrangement. In FIG. 11, amplitude / phase weighting is shown on the left side of the
loudspeaker array 1100. The two outermost loudspeakers show a weighting of 0.5 and the inner
ones have a weighting of 1, but one loudspeaker, namely the loudspeaker 2, also exhibits a phase
shift of 180 °.
[0004]
Such an arrangement achieves higher sound pressure levels as compared to a single loudspeaker.
This arrangement has a radiation area larger than a single loudspeaker, but the radiation
characteristics change little.
[0005]
In the case of a linear loudspeaker arrangement consisting of five active loudspeakers of the
same type shown in FIG. 11 (a), Bessel weighting gives the amplitude ratio shown at the left of
the arrangement 1100. The phase ratio of the individual loudspeakers to one another is 0 °:
180 °: 0 °: 0 °: 0 °. FIG. 11 (b) shows the connection of the loudspeakers in the case of
forming a series connection. Specifically, the loudspeakers 2, 3 and 4 are connected in series,
which are then connected in series to the parallel connection by the two outer loudspeakers 1
and 5. Thus, the Bessel-like weighting required for each loudspeaker may be caused by the
corresponding voltage drop.
[0006]
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2
Alternatively, Bessel weights may be generated using a parallel connection (FIG. 11 (c))
consisting of several parallel branches. One of these parallel branches consists of a series
connection by the loudspeakers 1 and 5, the remaining parallel branches each comprise an
individual loudspeaker (2, 3, 4).
[0007]
The advantage with respect to the connections in FIGS. 11 b and 11 c is that the required Bessel
weighting can be realized simply by connecting the loudspeakers properly. Their amplitude is
achieved by parallel / series connection, and the phase is achieved by the polarity of the
corresponding loudspeakers between one another. In FIG. 11, this means that the polarity of the
loudspeaker 2 is always opposite to that of the other loudspeakers, ie the negative input of the
loudspeaker 2 is not shown in FIG. Resulting from being connected to the positive output.
[0008]
However, the problem with such connections lies in the overall impedance of the array. In the
case of the series-connected five Bessel arrangement shown in FIG. 11 (a), the overall impedance
of the resulting arrangement is 3.5 times that of the individual loudspeakers. If the nominal
impedance of the individual loudspeakers is 4Ω or 8Ω, the overall impedance of the series
connection will be 14Ω and 28Ω respectively. However, conventional audio amplifiers are
optimized for nominal impedance from 4Ω to 8Ω. In order to drive the 14Ω impedance as well
as the 4Ω impedance at the same power, a fairly high voltage amplification is required.
[0009]
In the case of the parallel connection implementation in FIG. 11C, the impedance of the five
Bessel arrangement is reduced to 0.29 times that in the individual impedance case. The result is
an overall impedance of 1.14 ohms and 2.29 ohms for a 4 ohm or 8 ohm loudspeaker
arrangement, respectively. Usually this is much lower than the optimum load impedance for
current / modern amplifiers. If the current required for the amplifier is too high, it will result in
the device being destroyed.
[0010]
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For this reason, Bessel weighting can not be optimally realized when using loudspeakers of
conventional impedance, for example 4 Ω to 8 Ω.
[0011]
For linear arrays with more loudspeakers, i.e. 6 or more, the overall impedance reaches lower
values for parallel connections and higher values for series connections, assuming the same
loudspeaker impedance. Reach.
[0012]
European Patent Application Publication No. 0034 844 A1
[0013]
"Effective Performance of Bessel-Arrays" by D. Keele Journal of Audio Technology Society, Vol.
38, No. 10, pp. 723-748, October 1990
[0014]
It is an object of the present invention to provide an improved loudspeaker arrangement.
[0015]
This object is achieved by the sequences as claimed in claim 1 or by the method of producing
sequences as claimed in claim 17.
[0016]
The array of electroacoustic actuators comprises at least five electroacoustic actuators (101, 102,
103, 104, 105), which comprise at least two electroacoustic actuators in the first parallel branch
(110a) Connected in series, in the second parallel branch (110b) one electro-acoustic actuator is
connected in series to the parallel connection by the two electro-acoustic actuators, the first
parallel branch being the second Connected in parallel to parallel branches.
[0017]
In another implementation, the electro-acoustic actuators are such that at least two electroacoustic actuators are connected in series in a first series branch (110c) and one electro-acoustic
actuator in a second series branch (110d) Parallel branches connected in series to a series
connection by two electro-acoustic actuators, a first series branch connected in series to a second
03-05-2019
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series branch, and a series connected parallel branch (110c, 110d) Are configured to be driven
by the loudspeaker amplifier (112).
[0018]
This means that, according to the invention, each of these circuits can be mirrored.
In the case of electrically "mirrored" connections, each parallel connection is a series connection,
and vice versa.
The overall impedance is again directly related to the impedance of the individual loudspeakers.
The impedance is slightly higher than that of an individual loudspeaker if it is changed to use a
series branch, as opposed to using a parallel branch whose impedance is slightly below that of
the individual loudspeaker.
[0019]
This achieves an approximate Bessel weighting, but the overall impedance is well below the
known series connection or above the known parallel connection.
This means that conventional loudspeaker amplifiers optimized for the impedance of the
individual loudspeakers can be used.
[0020]
In other words, according to the invention, two parallel branches are used, one parallel branch of
which includes a series connection of one loudspeaker and a parallel connection by two
loudspeakers, as in the case of a series connection. Achieving the overall impedance of the
loudspeaker array neither too much nor too small as in the parallel connection.
[0021]
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In this way, a loudspeaker arrangement may be implemented which exhibits a non-identical but
approximated Bessel weighting.
However, as already apparent, the deviation from the ideal Bessel weighting is extremely small,
so a loudspeaker arrangement with parallel connection of parallel branches according to the
invention, ie an overall impedance that can be managed well The radiation behavior of the
loudspeaker arrangement with it is almost indistinguishable from that of the arrangement
implemented according to FIG. 11 and with the ideal Bessel weighting.
[0022]
What this means is that, according to the invention, the problem of electrical impedance that is
either too high or too low when using Bessel weighting is solved by a special connection that
causes Bessel weighting to be slightly modified.
Thus, as in the prior art, amplitude / phase weighting is achieved simply by reversing the polarity
of the individual loudspeakers or connecting the individual loudspeakers in series and in parallel.
The amplitude / phase weighting of the resulting individual loudspeakers is similar to that of FIG.
[0023]
Further, gain at sound pressure level and nearly identical radiation characteristics can be
achieved compared to individual loudspeakers.
However, as a result of using this connection according to the invention, for example to realize a
modified Bessel weighting, the electrical impedance of the array is within the range of the
impedance of the loudspeaker used.
03-05-2019
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This means that this arrangement can be operated without problems using conventional
amplifiers.
[0024]
As an alternative to or in addition to loudspeakers, solid-borne sound stimulators can be used as
further examples of electroacoustic actuators. These are also referred to as exciters or shakers,
and can be generated, for example, by mounting them on a plate to excite the plate.
[0025]
The following description will refer to individual loudspeakers. However, it is pointed out here
that the individual loudspeakers are only representative of all electroacoustic actuators.
[0026]
3 is a schematic diagram showing a loudspeaker arrangement. FIG. 1B is a schematic diagram
showing the connection of the individual loudspeakers (ILS) of FIG. 1A, with parallel branches.
FIG. 1B is a schematic diagram showing the connection of the individual loudspeakers (ILS) of
FIG. 1A, with a series branch. FIG. 6 shows a loudspeaker arrangement with a modified Bessel
weighting. Fig. 3 shows an example connection of the embodiment of Fig. 2; 7 shows an
alternative implementation of a loudspeaker arrangement with modified or approximated Bessel
weights. FIG. 4B shows one connection of the implementation of FIG. 4A. The detailed circuit
diagram for demonstrating the connection figure of FIG. 4B is shown. Fig. 6 shows a connection
variant of the arrangement with six individual loudspeakers in an active state. It is a chart figure
of various connection modifications. Fig. 6 is a schematic diagram showing an arrangement with
six individual loudspeakers in an active state. 7 shows a connection variant of the arrangement
with seven individual loudspeakers in an active state. FIG. 5 is a chart of their various
connections for the arrangement of individual loudspeakers in an arrangement. FIG. 7 is a
schematic view of a loudspeaker arrangement in which two of the individual loudspeakers are
absent or inactive. (A) to (c) show known sequences with known connections. 7 shows a
connection with a series branch. FIG. 12B illustrates the weighting of the connection of FIG. 12A
with a series branch. 6 shows a connection variant of an arrangement of six individual
loudspeakers. 7 shows a connection variant of an arrangement of seven individual loudspeakers.
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Fig. 6 shows simulated radiation characteristics of a linear array of 5 loudspeakers with original
Bessel weighting. Fig. 6 shows simulated radiation characteristics of a linear arrangement of five
loudspeakers with modified Bessel weighting as shown in Fig. 3; FIG. 5B illustrates simulated
radiation characteristics of a linear array of five loudspeakers with modified Bessel weighting
shown in FIG. 4B. FIG. 6 shows isobars of the radiation characteristics of a linear array of five
loudspeakers with original Bessel weighting, measured along the array direction. FIG. 4B shows
isobars of radiation characteristics of a linear array of five loudspeakers with modified Bessel
weighting, measured along the alignment direction of FIG. 4B.
[0027]
Next, preferred embodiments of the present invention will be described in detail with reference
to the attached drawings.
[0028]
FIG. 1A shows a loudspeaker arrangement according to an embodiment of the invention.
The loudspeaker arrangement comprises a casing 100 with attached individual loudspeakers
101, 102, 103, 104, 105, which in the embodiment shown in FIG. 1A are arranged to form a line
arrangement. including. The individual loudspeakers are connected to one another by individual
loudspeaker connections 110, which can be driven by the loudspeaker amplifier 112 via the
positive terminal 113 and the negative terminal 114. Preferably, the individual loudspeaker
connections 110 are configured such that an approximated Bessel weighting is achieved, but
such that the overall impedance of the loudspeaker arrangement is well within the control of the
loudspeaker amplifier 112. It is done.
[0029]
For this purpose, the individual loudspeaker connection 110 comprises an implementation as
shown in FIG. 1B. The individual loudspeaker connection comprises a first parallel branch 110a
with a series connection of individual loudspeakers and a second parallel branch 110b with a
series-parallel connection of individual loudspeakers. In particular, the first parallel branch 110a
comprises at least two individual loudspeakers connected in series, and the second parallel
branch comprises one individual loudspeaker connected in series to a parallel connection by two
individual loudspeakers . Furthermore, as shown in FIG. 1B, the two parallel branches 110a,
03-05-2019
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110b are connected in parallel and can be driven by the loudspeaker amplifier 112 of FIG. 1A.
[0030]
Alternatively, the individual loudspeaker connection 110 comprises an implementation as shown
in FIG. 1C. The individual loudspeaker connection comprises a first series branch 110d with a
parallel connection of individual loudspeakers and a second series branch 110d with a parallelseries connection of individual loudspeakers. In particular, the first series branch 110c comprises
at least two individual loudspeakers connected in parallel and the second series branch
comprises one individual loudspeaker connected in parallel to a series connection by two
individual loudspeakers . Furthermore, as shown in FIG. 1C, the two series branches 110c, 110d
are connected in parallel and can be driven by the loudspeaker amplifier 112 of FIG. 1A.
[0031]
FIG. 2 is an arrangement similar to that of FIG. 1A, but shown vertically. Furthermore, the
individual loudspeakers 101 to 105 are indicated by 1 to 5 , additionally, in FIG. 2 the
modified Bessel weighting is shown on the left side of the individual loudspeakers. These
modified Bessel weights are achieved by the special series-parallel connection of FIG. Here, the
first parallel branch 110a comprises two individual loudspeakers 2, 3 connected in series with
one another, and the second parallel branch 110b is in series with the parallel connection by the
two loudspeakers 1 and 5 outside the array. , Includes individual loudspeakers 4 connected to.
The negative weighting factor of the second loudspeaker 102 is achieved by reversing the
polarity of the loudspeakers with the other loudspeakers in the first parallel branch 110a, as
schematically shown in FIG. Ru.
[0032]
4A and 4B show alternative implementations. In particular, the positions of the loudspeakers 3
and 4 are reversed as compared to FIGS. 2 and 3. Here, the loudspeaker 4 in FIG. 4B is arranged
in the first parallel branch 110a and the loudspeaker 3 is arranged in the second parallel branch
110b. As a result, here the weightings of these loudspeakers are reversed, the loudspeaker 3
shows weighting 1 and the loudspeaker 4 shows weighting 0.75, which is opposite to the
corresponding weighting in FIG. 2 .
03-05-2019
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[0033]
The exemplary linear arrangements of FIGS. 2 and 4A each include five loudspeakers. The
loudspeakers in this case are connected according to FIGS. 3 and 4B, as compared to the
loudspeaker arrangement with 5 loudspeakers with original Bessel weighting. In this way, the
electrical impedance of the modified array is 14% less than the impedance of the individual
loudspeakers, such as 3.4 ohms when the loudspeaker impedance of the individual loudspeakers
is 4 ohms. For the original Bessel weighting, the electrical impedance of the array was 14 ohms
in the series connection of FIG. 11 (b) or 1.14 ohms in the parallel connection of FIG. 11 (c). In a
mirrored variant with a series branch, the impedance is 14% higher than the impedance of the
individual loudspeakers, ie for example 4.56 Ω.
[0034]
As a result of the loudspeaker connection change, the amplitude and phase weightings are
corrected. This is because the coefficient "1" is actually required instead of the coefficient "0.75".
However, nevertheless, the radiation characteristics of the array are compared to the array with
the original Bessel weighting or to individual loudspeakers, as highlighted in FIGS. 14, 15, 16, 17
and 18. There is only a slight change.
[0035]
FIG. 4C is a detail view showing the connection of FIG. 4B, in particular the connection of the
positive input / negative input of the individual loudspeakers. In particular, the negative polarity
of the loudspeaker 2 is shown, and the negative terminal of the loudspeaker 4 to the negative
terminal of the loudspeaker 2 so that a phase shift of 180 ° is achieved compared to the other
loudspeakers in the array. It is combined.
[0036]
5, 6 and 7 show further embodiments of larger linear arrangements. Such Bessel weighted linear
arrays typically use 7 or 9 elements as well, and the D. Keele "Effective Performance of BesselArrays" Journal of Audio Engineering Society, Volume 38 10, pages 723-748, October 1990
03-05-2019
10
(non-patent document 1). In these arrangements, elements and loudspeakers must be
distinguished. Here, the loudspeakers are elements of an array that includes non-zero amplitude
weightings. Loudspeakers should not be placed at array locations with an amplitude weighting of
zero, but blanking should not be eliminated by placing adjacent loudspeakers closer together.
Alternatively, the loudspeakers may be arranged in an array position with an amplitude
weighting of 0, but the loudspeakers are inactive or sound much less than other loudspeakers
with an amplitude weighting other than 0 in the array. It only emits pressure levels (e.g., at most
10%).
[0037]
It should be pointed out with respect to FIG. 7 that the distances between the positions of the
individual loudspeakers are equal or equally spaced. Therefore, when the loudspeaker 4 is
omitted, the distance between the loudspeakers 3 and 5 is doubled.
[0038]
The problem of too high electrical impedance (series connection) and too low electrical
impedance (parallel connection) when using conventional loudspeaker impedances, ie
loudspeaker impedances between 4 Ω and 8 Ω, is observed when using conventional
connections. Will be even larger.
[0039]
FIG. 5 particularly shows an implementation of a 7-array with six loudspeakers in the active state.
As shown in FIG. 7, position 4 of the 7-loudspeaker arrangement, ie the middle position, is the
position of the inactive individual loudspeakers, or the position which is left empty, ie the
individual loudspeakers are not arranged It is a position. The remaining six individual
loudspeakers are connected as shown in FIG. The weighting of the individual loudspeakers in FIG.
5 generated by the series / parallel connection is shown in the figure.
[0040]
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Thus, in all the different connections shown in FIG. 6, the two loudspeakers with a weighting of
0.4 are the two outermost loudspeakers. However, the positions of the loudspeakers with
weightings 0.8 and 1 can be varied accordingly, such that at least six different ways of arranging
the individual loudspeakers in the position shown in FIG. 7 are obtained. . This means that the
connection is preferably as shown in FIG. 5, but in FIG. 5 the position of the loudspeaker with
weighting 1 and the position of the loudspeaker with weighting 0.8 are the loudspeaker
arrangement It means that different positions inside of 2, ie positions 2, 3, 5, 6 can be taken.
Furthermore, there are more possibilities than those shown in FIG. A variant which is not shown
in FIG. 6 is that the amplitude weightings are mirrored at the array center or ILS (individual
loudspeakers) 4, for example 0.4: 1: 1: 0: 0.8: 0. 8: 0.40.4: 1: 0.8: 0: 1: 0.8: 0.4.
[0041]
The phase weightings remain equal in this case.
[0042]
A further variation is to mirror phase and amplitude weighting at the alignment center (ILS4).
This corresponds to turning the array (FIG. 7) upside down.
[0043]
Phase weighting is achieved, in particular, by reversing the polarity of the loudspeakers arranged
in the third position or, in the case of phase mirroring at the array center, the loudspeakers in the
fifth position. One such implementation is shown in FIG. 6, according to which this is the
corresponding loudspeaker.
[0044]
FIGS. 8, 9 and 10 show a further embodiment for a line arrangement with nine loudspeakers, as
shown in FIG. 10, the two positions 4, 6 in particular seven individual ones. Not present or
inactive, as would be a loudspeaker connection (eg, FIG. 8). In the embodiment shown in FIG. 5 it
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was necessary to add one individual loudspeaker to the second parallel branch 110b to achieve
the preferred weighting compared to FIG. 3 or 4B, but this time As shown in FIG. 8, one
individual loudspeaker is added to the first parallel branch 110a.
[0045]
As a result, weighting as shown in FIG. 8 occurs. The individual positions of the loudspeakers can
be changed by their weighting, as shown in FIG. 9, so that as long as positions 4 and 6 remain
empty or inactive, individual Several different arrangements of loudspeakers occur. However, the
inactivation does not necessarily have to be completely inert, for example, the loudspeaker with
the least amount of radiation in the arrangement as long as two loudspeakers with a weighting of
0.45 are arranged at both ends of the line arrangement Can also mean a level that can be less
than 10% of. On the other hand, the loudspeakers with weights 0.75 and 1.0 at the inner position
can be changed relatively arbitrarily. However, it should be noted that in the preferred
embodiment, the polarity remains opposite in the second and fifth positions.
[0046]
FIG. 12A shows a detailed embodiment of an implementation with serial branches. The first
series branch comprises the loudspeakers 102, 103 and the second series branch comprises the
loudspeakers 104 connected in parallel to the series connection by the loudspeakers 101 and
105. The resulting weighting is shown in FIG. 12B.
[0047]
FIG. 13A shows the use of a series branch for the six loudspeaker variant as in FIG. An additional
loudspeaker 500 is included in the second series branch and connected in series to the
loudspeaker 104 of FIG. 12A.
[0048]
FIG. 13B shows the use of a series branch for the seven loudspeaker variant as in FIG. An
additional loudspeaker 500 is included in the second series branch and connected in series to the
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loudspeaker 104 of FIG. 12A. Further additional loudspeakers are arranged in parallel with the
loudspeakers 102, 103 of FIG. 12A in the first series branch.
[0049]
FIG. 14 shows the simulated emission characteristics of a linear array of five loudspeakers with
original Bessel weighting. The radiation characteristic relates to a loudspeaker arrangement
arranged horizontally in the plane of the drawing and emitting upwards with respect to the plane
of the drawing. Furthermore, this illustration is parameterized over frequency from 100 Hz to
8000 Hz.
[0050]
FIG. 15 shows a diagram corresponding to the implementation of FIG. 3 and FIG. 16 shows a
diagram corresponding to the implementation of FIG. 4B, ie these show diagrams corresponding
to an approximated or modified Bessel diagram, Although observed to be consistent, the overall
impedance of the loudspeaker array can be optimally driven by a commercially available
loudspeaker amplifier or by a loudspeaker amplifier configured to the impedance of an individual
loudspeaker .
[0051]
FIG. 17 shows an isobaric diagram of the radiation characteristics of a linear array of five
loudspeakers with original Bessel weighting, measured along the array direction.
It should be pointed out here that the 0 ° line corresponds to the main radiation direction, ie, for
example, the 90 ° line of FIG. Furthermore, this isobar diagram indicates the deviation with
respect to the sound pressure on the zero coordinate in the predetermined range of coordinates
for frequencies from 319.9 Hz to 20,000 Hz. It becomes clear by comparing FIG. 18 and FIG. 17
that the arrangement of FIG. 4B according to the present invention is an excellent representation
of the ideal Bessel arrangement of FIG. It is an approximation.
[0052]
In the following, further embodiments of the invention will be described.
03-05-2019
14
[0053]
As already illustrated with reference to the various figures, two separate loudspeakers connected
in parallel in the second parallel branch may for example be the loudspeakers 1 and 5 in FIG. 3
or FIGS. 5 and 8 It is arranged at the array end of the line array, like the corresponding
loudspeakers of.
Furthermore, the reversal of the polarity of at least the 5-loudspeaker arrangement is preferably
achieved by setting the polarities of the two loudspeakers arranged in the first parallel branch
110a opposite.
[0054]
In one implementation, the individual loudspeakers each show an impedance, but the impedances
of the individual loudspeakers are equal, or the difference from the average value of all the
impedances of the individual loudspeakers is at most 20%. Although bias due to manufacturing
can not be completely ruled out, preferably at least the nominal impedances of the individual
loudspeakers are equal. However, if the deflection of the loudspeaker impedance of the individual
loudspeakers, i.e. the deflection of the impedance is relatively modest, good overall alignment
impedance values suitable for conventional loudspeaker amplifiers can still be achieved.
[0055]
Furthermore, whether in the illustrated arrangement or in the larger arrangement, they are
connected in series and arranged in the first parallel branch, for example as the individual
loudspeakers 2, 3, 4 etc. in FIG. 3 or 4B. Individual loudspeakers, and individual loudspeakers
connected in series and disposed in the second parallel branch are also disposed at an inner
position in the array line, and each has, for example, 1 and 5 in the array, etc. Another discrete
loudspeaker, typically connected in parallel, is adjacent to the outside.
[0056]
Typical loudspeaker impedances are in the range of 4Ω to 8Ω.
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However, in the case of the present invention, it is preferred to use individual loudspeakers
whose impedance is greater than or equal to 2.5 Ω or less than or equal to 12 Ω.
[0057]
For example, as described in connection with FIG. 1A, the individual loudspeakers in the first
parallel branch and the second parallel branch may be arranged in an array such that at least an
approximated Bessel weighting results for the loudspeaker array. Are connected to each other.
The approximated Bessel weighting means, for example, that in FIG. 2 the value 0.75
approximates weighting factor 1 or the value -0.75 approximates weighting factor -1. However,
in connection with the description herein, those skilled in the art can recognize additional series /
parallel connections targeting medium overall impedance, especially for larger sequences.
[0058]
As shown in FIG. 5, the correspondingly larger arrangement compared to FIG. 3 includes an
additional loudspeaker 500 in the second parallel branch, which represents a weighting of 0.8. A
larger arrangement is likewise shown in FIG. 8 and, in comparison to FIG. 5, includes an
additional loudspeaker 800 in the first parallel branch in addition to the loudspeaker 500 also
present in FIG.
[0059]
In the loudspeaker array manufacturing method, the individual loudspeakers are arranged in one
step in the loudspeaker array. Furthermore, the individual loudspeakers are connected in such a
way that a parallel connection of the described parallel branches results, on which the connected
loudspeakers are typically and preferably optimized for the impedance of the individual
loudspeakers And / or driven by the configured loudspeaker amplifier.
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