Cardioids crossed at 90 degrees

Discussion in 'rec.audio.pro' started by James Boyk, Aug 21, 2003.

  1. James Boyk

    James Boyk Guest

    >>...reducing the angle between the mics widens the playback image, and vice-versa.


    Mike Rivers wrote: This is true, and it works for cardioids also. It's counter-intuitive
    until you either think about it real hard or just try it.


    On our stereo miking demo recording, it's clear that 120-coinc.-cards. give a *wider* image than 90-coinc.-cards. This would seem to contradict the statement above.


    James Boyk
  2. Mike Rivers

    Mike Rivers Guest

    In article <bivpl4$ic4$1@naig.caltech.edu> boyk@caltech.edu writes:

    > On our stereo miking demo recording, it's clear that 120-coinc.-cards. give a
    > *wider* image than 90-coinc.-cards. This would seem to contradict the
    > statement above.


    They're all different, because not all directivity patterns look like
    those in textbooks. That may well be the case with the mics that you
    used for your demo. Maybe at 130 degrees it would narrower. Or at 70
    degrees it would sound wider.




    --
    I'm really Mike Rivers - (mrivers@d-and-d.com)
  3. Bob Cain

    Bob Cain Guest

    Mike Rivers wrote:
    >
    > In article <vl63jcha7sfc06@corp.supernews.com> williams@nwlink.com writes:
    >
    > > Forget about cardioids for a moment and think of figure-8s at 90 degrees. The
    > > instruments "facing" each mic will be reproduced as coming directly from the
    > > corresponding playback speaker. Therefore, reducing the angle between the mics
    > > widens the playback image, and vice-versa.

    >
    > This is true, and it works for cardioids also. It's counter-intuitive
    > until you either think about it real hard or just try it.


    Makes intuitive sense to me. Given the same common
    equispaced speaker/listener configuration, pointing the mics
    further to the side should compress the reproduced image
    closer to center on playback and vice versa. Hmmmm.

    The main reason I take most statements about the imaging of
    coincident techniques with a grain of salt is that they
    ignore the configuration and physics of the
    reproduction/listening end and that is every bit as
    important a consideration.


    Bob
    --

    "Things should be described as simply as possible, but no
    simpler."

    A. Einstein

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