Thanks, Robin. Why does this affect the type of wind shield required, apart=
from perhaps needing it in lighter winds?
Peter Shute
> -----Original Message-----
> From:
> On Behalf Of Robin
> Sent: Tuesday, 19 February 2013 8:03 AM
> To:
> Subject: [Nature Recordists] Re: Is my equipment outdated?
>
>
>
> Peter Shute wrote:
>
> > David, can you please elaborate on the term "pressure gradient
> > sensitive?"
>
> It's another way of saying the mic is directional. A
> microphone that works based on a pressure-gradient has both
> sides of the diaphragm open to the air, so that sound waves
> are measured as a difference between the pressure on each
> side of the diaphragm. The axis formed by the diaphragm is a
> region of null pressure difference; the resulting polar
> pattern is a figure eight.
>
> The second mic principle is pressure-operated. Such mics have
> only one face of the diaphragm open to pressure changes,
> which is registers no matter where this originates. These
> mics are omnidirectional.
>
> Other polar patterns are made up of combinations of these two
> basic principles. For example, adding the two results in
> cardioid (since one lobe of the figure eight has positive
> phase and the other negative).
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