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JPH01184000

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DESCRIPTION JPH01184000
[0001]
FIELD OF THE INVENTION The present invention relates to an acoustic maze consisting of a
number of parallel channels of varying length, the entrance of the channels being diagonally
aligned to the acoustic energy source. The acoustic maze is configured to 'diffract' and disperse
the sound waves uniformly and to radiate the sound uniformly across all three wheels in front of
the maze. PRIOR ART Since the labyrinth is formed by a plurality of chambers each having its
own resonant frequency, such "diffraction" of the sound waves can occur. The frequencies
selected for the chambers and their relative positions produce an acoustic interference pattern
on the surface of the labyrinth, thereby producing a "diffraction pattern". Typically, the sound
waves projected into the maze are! :! It originates from a moving diaphragm ("transducer")
excited by alIi. Thus, the sound waves are diverged as polarization. The diffractive effect of the
maze substantially reduces the polarization of the emitted eight flavors. In practical systems, two
or more "transducers" are needed to provide a sufficiently broad frequency reproduction for high
quality audio reproduction. In a conventional system without such a labyrinth, since the sound
waves to be projected are polarized, these two or more transducers interact to project sound
waves from each sound source into the listening area. At the same time, the net waveform
amplitude substantially peaks and nodes. By using one or several mazes to diffract the sound
waves emanating from the transducer, such interactions are substantially reduced while the
sound waves are dispersed into wide angles. Conventionally, the angular dispersion problem is
due to the 811 lens system (Ghana et al. U.S. Pat. No. 4.164.631: Dapru, L., Hartsfield U.S. Pat.
No. 3,957.134). These systems enhance dispersion but do not reduce the polarization of the
acoustic waves. In addition, they tend to be acoustically inefficient, and can also give the drive
transducers non-linear load impedances. DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS Most loudspeaker systems include a transducer consisting of an electrically
driven diaphragm (transducer) placed over a hole cut in a box of various sizes and configurations.
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These conventional speaker systems usually radiate directly to the listening area.
Thus, two major problems arise: (2) sound waves emanating from the loudspeaker tend to reduce
the radiation angle from the central axis of the transducer when the playback frequency is high,
and 0 sound waves are polarized The wavefronts emanating from two or more transducers in the
overall system interact to produce beaks and nodes in amplitude within the listening
environment. In the present system, excellent dispersion angles are obtained using the maze
systems 1, 2 and 8. Each frequency -1! Dispersion within the area is very pronounced. Dispersion
angles up to 75 ° from the protruding transducer axis 9 [total 150 °] are easily obtained. In the
frequency range in which the diffractive device is designed, the dispersion angles obtained are
uniform. The diffraction vi 隨 further contributes to reducing one wave of the emitted sound. In
wave mechanics physics, it is said that when polarizations sharing the same plane of polarization
are combined, they interact strongly with each other. Thus, the two interacting polarizations are
modulated with each other even at different frequencies. By reducing the polarization, this
intermodulation is minimized. The advantage is that, especially in multi-transducer speaker
systems, two or more diffractive speakers (in stereo systems etc.) where the accumulation of
standing waves in the listening room is reduced, where the transducers are not significantly
cross-modulated with each other The simultaneous use of the system 4 prevents the speaker
systems from being modulated with each other. It has been found that the diffraction effect is not
dependent on the linearity of the maze chamber. The chi-humbs can be bent or even bent.
Therefore, the diffractometer 1 uses this to compact the maze to reduce the overall size and to
make effective use of the available space. Other configurations of bends and folds can also be
implemented. Thus, the chamber may be completely FJ type as shown in detail in FIG. They can
be formed to a depth suitable to form a chevron after being bent to a degree. They can be bent
and folded as shown in FIG. Furthermore, they need not be straight, but can have a triangular
cross section or any other geometric cross section arising from the desired resonant cavity. They
can also be arranged in a concentric pattern, as shown in FIG.
[0002]
Brief description of the drawings
[0003]
Figure 1 is an open plan view of an embodiment of the present invention comprising a plurality
of labyrinths 1 and 2 arranged at an angle 5 and 6 with respect to a plurality of transducers + 13
and 4 and transducers 3 and 4; 2 is a detailed sectional view of the labyrinth forming the
structure shown in FIG. 1, FIG. 3 is a detailed sectional view of the labyrinth 2 of the high-
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frequency transducer ("tweeter") in a preferable relationship with the transducer 4, and FIG. A
detailed cross-sectional view of a very high frequency sub-diffractor that can be used to
complement the maze 2, where the chamber set that produces the diffraction effect is a
trapezoidal cross section, FIG. 5 shows the maze 2 with the chamber being rectangular A detailed
cross-sectional view of a very high frequency sub-diffractor 8 which can be used to supplement,
FIG. 6 is a very high frequency n1 times diffractor cross-section showing that the diffractor can
be formed in concentric chambers.
Explanation of reference signs 1.2.8 · · · · · · · Maze system 3.4 · · · · · · · · Transducer
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