> From: Dan Dugan <>
>
>
>>>I have been using 2 spaced omnis (2xSennheiser 110
>>>mics approx. the distance of human ears) with a baffle
>>>board between. This is what I have known as binaural.
>>> If this is the pattern recieved by the DSM mic setup
>>>why is it not binaural?
>>>Tony Baylis.
The Jecklin Disk is two omni's spaced 8.25cm apart with a 28 cm baffle
between (in it's original form). Not the same thing as binaural,
generally classed as near coincident spacing. Sounds like what's being
described here even if the dimensions are a little different.
> Quasi-biaural, in my book. To be really binaural you need to record
> in a real or simualted ear canal with pinnas. But all the
> quasi-binaural systems (disk, sphere, eyeglass clips, mikes on
> headphones) provide most of the realism of binaural when heard on
> headphones, and better frequency response when reproduced on speakers.
I'm not sure I understand the better frequency response. Certainly some
of the quasi-binaural systems do better on speakers than true binaural,
but I'm not sure that it's due to frequency response, which is a
function mostly of the mic capsules used and so on. That would seem to
be a issue somewhat independent of mic arrangement.
In a true binaural signal each channel contains only what each ear
should hear to form the true soundfield. When binaural is listened to
with speakers you get mixing of the signals (crosstalk to use the term
used in the New Stereo Soundbook). Each ear is hearing some of the
signal intended for the other ear. This damages the image that binaural
is trying to create. But, such mixing is pretty much all frequencies.
BTW, binaural can be listened to with full effect with speakers. Place a
acoustic barrier between the speakers that extends all the way to the
listener to prevent crosstalk. Stick your nose on the barrier and enjoy.
It's possible you mean better frequency response in the sense that the
tiny mics used in the ear canals can be outperformed by larger mics in
the quasi-binaural positions? That does make sense.
> I record with omnis on shoulder pads; kind of a stretched
> quasi-binaural system, not exactly "spaced omnis," since my neck is
> in between.
I don't know where everybody get's such quiet bodies. Mine is always
ambushing me with some gurgle or something at the wrong moment. And
that's with mics that are not mounted on me. I'd think it would get
tougher with mics mounted on you.
I do understand that the shoulder pads provide some isolation. But I
have times all I can do is put the SASS on a tripod and move my noisy
body away.
Walt
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