|SPHEROVOX PENTAHORN OMNIVOX / DODECAHEDRON CORNER FOLDED HORN ACOUSTIC MEASUREMENTS LATEST DEVELOPMENT ABOUT US CONTACS|
DODECAHEDRON SOUND SOURCE REALIZATION
CURRENT AXES OF MEASUREMENT
DODECAHEDRON POLAR PATTERNS
PENTAHORN MAIN FEATURES
AUDIO ENGINEERING SOCIETY (AES)
PRESENTATION [PowerPoint] [Acrobat]
OMNIVOX VERSUS SPHEROVOX COMPARISONS
NEWS The Audio Engineering Society Comes to Los Angeles for 137th International AES Convention
AES137 to feature busy itinerary of numerous track sessions, including Recording and Production, the Project Studio Expo, Networked Audio, and more AES136 Berlin Highlights Project Studio Expo and Special Sound for Picture Programming
Celebrating the success of the 136th Audio Engineering Society Convention, which took place April 26 - 29, 2014 at the Estrel Hotel and Convention Center in Berlin, Germany, the AES continues to forge new territory with its successful tracks and programs at recent Conventions. AES Showcases Latest Audio Innovations and Best Practices at 136th International Convention in Berlin
Successful Technical Program and Exhibition draw high attendance and positive response from attendees and exhibitors alike
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
There are 10 such 3-fold symmetry axis
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
There are 15 such 2-fold symmetry axis
There are 30 such axis
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 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 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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