THE ACOUSTICAL FUNCTION OF THE EARLOBE:
The perceived sound information is divided by the "Anthelix" into two parts. The first part is going directly, from the edge of the "Anthelix", into the auditory canal. The other part of the sound information is diverted to the entrance of the "Helixtunnel" then follows through this tunnel and only then will it reach the auditory canal. The distance of this soundwave is appr. 66 mm. or 0.2 milliseconds time delay. Everyone can convince himself, by obstructing the way of the 2nd sound-wave with his fingers.
This experiment confirms the theory of the two soundwaves. The test has been done in the following way: A square-wave of 0.14 milliseconds has been reproduced through a loudspeaker placed 90 degrees on the side to the test object. A mini-microphone, which does not obstruct Helix the edge of the auditory canal, has been placed into the different models. The first, direct sound-wave remains the same with all the models. The 2nd, indirect soundwave however, changes dramatically from the models to the natural ears, in which the 2nd soundwave is also very pronounced. (nearly as strong as the 1st sound-wave.)
THE HORIZONTAL SOUND LOCALISATION WITH ONE EAR.
The intensity of the first, direct sound-wave changes depending on the angle of dispersion of the sound, with the 2nd indirect soundwave, this change is much more marked. The ideal angle of sound dispersion should therefore be between 45 and 90 degrees.
By watching people with a defect in hearing one can notice that they turn their head to the source in such a way that they can receive the soundwaves in the optimal angle. i.e. between 45-90 degrees.

THE VERTICAL SOUND LOCALISATION WITH ONE EAR.
The reception of sound originating 30 degrees over the edge of the auditory canal shows the second information as quite flat, where as with reception of sound originating 45 degrees below the edge of the auditory canal, shows a sharp peak, different from each persons ear. The displacement of the indirect 2nd sound-wave in time delay is a factor, also the intensity and form of the 2nd soundwave changes dramatically. The optimal angle of dispersion of sound should be between the two (30° above and 45° below
THE EAR.
The sound passes through the auditory canal and then reaches the eardrumm. Here the mechanical charge is transfered with the "hammer", "anvil" and "stirrup" to the inner ear "snail". The auditory nerves or "palpate cells" are distributed in the following manner in the inner ear. Near the larger opening we find the auditory nerves for the high frequencies and at the end the ones for the low frequency. Herewith, one can explain, why an overload of the ear, with low frequencies will damage the hearing of high frequencies first.
The Jecklin Float headphones were also produced by Precide. The Princip is the same as with the ERGO phones , we were able to achieve a much more efficient speaker, which can easily be driven by any walkman or Computer. The ERGO headphones can be adjusted in the hights. The ERGO AMT, with the Air Motion Transformer, replaced the Jecklin Float electrostatic unit. All spare parts for the Jecklin Floats, with the exception of the headband, dating back as long as 1980 are still available  
With the Jecklin OSS disc is a help in making better recordings for the amateur. It is also used for professional recordings of larger orchestras and assures a proper stereo dimension. It also enables the user to capture some of the ambience, where the recording is made.

 

Precide SA
via V. Vela 33

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Tel. 091 6831734 - 35 FAX 091 6836679

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