SPHEROVOX PENTAHORN OMNIVOX / DODECAHEDRON CORNER FOLDED HORN ACOUSTIC MEASUREMENTS LATEST DEVELOPMENT ABOUT US CONTACS
DODECAHEDRON SOUND SOURCE REALIZATION CURRENT AXES OF MEASUREMENT DODECAHEDRON MIMICRICS DODECAHEDRON POLAR PATTERNS PENTAHORN MAIN FEATURES
AUDIO ENGINEERING SOCIETY (AES)
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DODECAHEDRON There are an infinite number of different polar pattern planes of measurement across the dodecahedron center Four axes, however, determine particular dodecahedron symmetry These two planes of measurement don’t cross any loudspeaker axis

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There are 10 such 3-fold symmetry axis

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There are 6 such 5-fold symmetry axis
DODECAHEDRON CURRENT AXES OF MEASUREMENT This first “vertical” plane of measurement crosses 4 LS acoustic centers This second “eccentric” axis uses plane of measurement trough 2 LS acoustic centers These two planes of measurement share common mic axes equally distant to 4 LS at a time, and another ones equally distant to 5 LS centers

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There are 15 such 2-fold symmetry axis

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There are 30 such axis
DODECAHEDRON MIMICRICS DODECAHEDRON MIMICRICS Dodecahedron mimicris MEASURING IN A PLANE, IN WHICH NO LOUDSPEAKER AXIS LIE – SO CALLED “HORIZONTAL PLAIN” GIVEN IS SOUND POWER LEVEL FREQUENCY RESPONSE INSTEAD OF POLAR PATERN SMOOTHING ANGULAR RESOLUTION, AS DONE IN ISO3382 PAPER STANDARD BY “GLIDING” CONCEPT GIVING MISLEADINGLY GENUINE SPHERICAL SHAPE – EVEN WITH SPHERICAL PROTECTING GRILS DODECAHEDRON POLAR PATTERNS The last two axes of rotation have been chosen for current polar pattern measurements to perform the comparative measurements.

The results are presented for each one of 2kHz and 4kHz octave center frequency, together with the three separate 1/3 octave center frequencies patterns within each octave. From 1/3 octave measurements is visible that a maximum deviation of more than 10dB is readable within 10o angular segment, what means that at list 1o angular resolution is to be used during impulse response measurements for automatic polar pattern construction, provided 1dB error would be tolerated. The number of discrete Impulse Response (IR) measurements to have 1deg resolution with 1db accuracy would be roughly 360 times 180, or about 64800 measurements altogether. It would be rather unrealistic to expect readily available software to be able to construct 3-d polar patterns from that much data.

Polar pattern of the dodecahedron to 2kHz octave band excitation signal along with one-third octave bands within (1.6kHz - red, 2kHz - green, 2.5kHz - blue). Polar pattern of the dodecahedron to 2kHz octave band excitation signal along with one-third octave bands within (1.6kHz - red, 2kHz - green, 2.5kHz - blue).
Polar pattern of the dodecahedron to 2kHz octave band excitation signal along with one-third octave bands within (1.6kHz - red, 2kHz - green, 2.5kHz - blue).
Polar pattern of the dodecahedron to 4 kHz octave band excitation signal along with one-third octave bands within (3.15 kHz - red, 4 kHz - green, 5 kHz - blue). Polar pattern of the dodecahedron to 4 kHz octave band excitation signal along with one-third octave bands within (3.15 kHz - red, 4 kHz - green, 5 kHz - blue).
Polar pattern of the dodecahedron to 4 kHz octave band excitation signal along with one-third octave bands within (3.15 kHz - red, 4 kHz - green, 5 kHz - blue).


Polar pattern of the dodecahedron to 2 kHz octave band excitation signal along with one-third octave bands within (1.6 kHz - red, 2 kHz - green, 2.5 kHz - blue); another axis of rotation. Polar pattern of the dodecahedron to 2 kHz octave band excitation signal along with one-third octave bands within (1.6 kHz - red, 2 kHz - green, 2.5 kHz - blue); another axis of rotation.
Polar pattern of the dodecahedron to 2 kHz octave band excitation signal along with one-third octave bands within (1.6 kHz - red, 2 kHz - green, 2.5 kHz - blue); another axis of rotation.
Polar pattern of the dodecahedron to 4 kHz octave band excitation signal along with one-third octave bands within (3.15 kHz - red, 4 kHz - green, 5 kHz - blue); another axis of rotation. Polar pattern of the dodecahedron to 4 kHz octave band excitation signal along with one-third octave bands within (3.15 kHz - red, 4 kHz - green, 5 kHz - blue); another axis of rotation.
Polar pattern of the dodecahedron to 4 kHz octave band excitation signal along with one-third octave bands within (3.15 kHz - red, 4 kHz - green, 5 kHz - blue); another axis of rotation.
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