[Top] [All Lists]

Re: parabolic mics

Subject: Re: parabolic mics
From: "Jim Morgan" fundador_four
Date: Tue Jun 14, 2011 9:41 am ((PDT))
They both work, but the cardioid picks up less surrounding sounds, my

Jim Morgan

On Tue, Jun 14, 2011 at 9:35 AM, Avocet <> wrote:

> > Question 2:
> Is the parabola approach designed to be used with JUST omni mics?
> Are other caption patterns allowed, or is it senseless to use
> directional mics here?
> Dani,
> As a supplementary answer, try any mic with a parabola and see what it
> does. However, bear in mind that a double mic or a gunmic will be
> wider or longer than the high frequency focus of the parabola so the
> basic parabola theory won't apply.
> > Does this enhance directivity for a shotgun?
> You would be combining two very different directional principles and
> it is unlikely that they would reinforce each other's characteristics
> but try it. And it is likely that they would reinforce each other's
> disadvantages.
> BTW I regard the MKH 416 one of the most useful mics available and
> can't see how it can be improved on except for the MKH 816 (still
> available second hand). If you have a bottomless pocket there is the
> MKH 8070 which has an amazing spec but I can't afford two of them for
> stereo. :-) I think the law of diminishing returns would act here,
> money-wise.
> Going to basic parabola theory:
> a) The focus is finer at higher frequencies and virtually non-existant
> at low freqencies.
> b) An omni mic will pick up both direct sound and reflected sound and
> at some frequenies these will tend to cancel out, but for most wanted
> frequencies the reflected sound swamps the direct.
> c) A cardioid theoretically avoids cancellation effect type b) but
> other diffraction effects still apply. A cardioid is always more
> susceptible to wind and handling noise. Take your pick on
> disadvantages.
> d) Stereo with a parabola is only possible using two points just
> off-focus on either side. The theory behind this is complex so trial
> and error is the best method of finding out what works.
> David
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU