Oh, that's your point!
Klas.
At 20:39 2005-05-13, you wrote:
>Klas, you wrote,
>
> >Have you ever put a medium class directional microphone on a rotating plate
> >in front of a 10kHz speaker and looked at the linear voltage output for
> >different degrees?? I guess not....
> >
> >Cause if you do, you will find so many peaks and gaps - 40 db and more!! -
> >when turning the mic only a few degrees one or the other direction!
> >And if you take another microphone of the same type, it will probably show
> >a quite different "exact" polar pattern. I agree with what you say, but I
> >think we must accept that polar patterns are very approximative and that,
> >perhaps, the db scale is the most "readable".
>
>Smoothing of both frequency response and polar pattern curves is
>common, and is justifiable to a certain extent as being an average of
>individual unit differences or variations over space. Smoothing is
>helpful. But that has nothing to do with the scale.
>
> >If one manuf uses db, everyone else has to do the same. But in this case it
> >is not fraud, just an approximation.
>
>My objection in the polar patterns is that a dB scale distorts the
>-shape-, not the details. A linear polar plot of a cardoid mic, for
>example, shows 1.0 on axis and 0.5 at 90 degrees. That corresponds to
>the shape of the pattern in space, i.e., a source at five feet at 90
>degrees will be as loud as the same source at ten feet on-axis. Being
>able to visualize the pattern in space is very valuable. A dB scale
>makes the pattern look much wider than it is.
>
>-Dan Dugan
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
________________________________________________________________________
________________________________________________________________________
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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