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Now, onto the near coincident recording techniques. While the coincident
techniques offer excellent interchannel phase and timing characteristics, many
people prefer the sound of a slight interchannel delay. The O.R.T.F , named
after the Office de Radiodiffusion-Television Francaise and N.O.S adopted by
the Nederlandsche Omroep Stichting address this concern.
The typical spacing
of 17 cm to 30 cm is intended to simulate the perceived inter-ear delay time.
This fairly small distance results in substantially coincident sound at low
frequencies and an increase in interchannel delay and phase characteristics
that are natural to the human ear. Otherwise these techniques differ little
from the coincident methods already described. The slightly "phasey" sound of
these methods can be quite pleasing to the ear and offer good localization
and an excellent (although slightly exaggerated) sense of depth.
The O.R.T.F.
method employs two cardioid microphones with a 17 cm spacing at 110 degrees is
the most popular of these two methods. The N.O.S. technique uses two cardioid
microphones with an included angle of 90 degrees and a 30 cm spacing. The
Faulkner method uses two bidirectional microphones, facing forward with a
spacing of 20 cm. This method offers most of the coherence of the coincident
methods with the "openness", or sense of space, created by the time and phase
differences resulting from the space between the microphones.
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