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Re: The seashore

Subject: Re: The seashore
From: madl74
Date: Sun Jun 8, 2014 6:57 am ((PDT))
> Today I and my wife set up 2 Senheiser ME62 close to the sea nearby the
> Art Museum of Sigurj=C3=B3n =C3=93lafsson in Reykjavik. an AB-setup was u=
sed with
> only 16 cm between the mics.


There was good placement in spite of my reservation on time difference
stereo with separated mics. I noticed some effects which were due to
cancellation of distant sounds due to an echo, probably a ground echo.

At 00:50 there is a periodic cancellation at 119Hz corresponding to an echo=

path of 1.43 metres, corresponding to about 700mm or tripod height. This is=

why I often try a mic rig mounted low.

The prop plane at 01:05 arrived centre and departed right.

At 09:50 the helicopter rotor had a blade frequency of 15Hz and a
stabilising tail rotor frequency of around 95Hz. There was a doppler shift=

as it passed from about 95Hz to 73Hz which gives a very approximate speed o=

The helicopter arrives right and departs half left. It is flying quite fast=

as the rotor blades are near to producing a shock wave. At the end, in the=

distance, it turns and we hear a bit of rotor shock wave.

At 14:30 a passing boat at 77Hz showed another echo cancellation effect.

There was a distant passerine bird species at 06:30 which was poorly placed=
and a brief seagull at centre at 14:20 and one to the right at 17:46.

David Brinicombe

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