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Posted by Toby on 02/21/07 09:45
<anujpals@gmail.com> wrote in message
news:1172037823.014750.130950@a75g2000cwd.googlegroups.com...
> Good Morning:
>
> I am a graduate student. I am looking for a microphone
> to record the sound of traffic coming from certain direction of a
> roadway at an interesection. I am interested to record the sounds with
> in a range of 500 ft in a particular direction.
>
> Please let me know if there is any wireless microphone that would be
> ideal in my
> case.
>
> I would really appreciate your help.
>
> Thank you
>
> Anuj Sharma
It sounds like you need a highly directional mic, which rejects off-axis
sounds. Google "shotgun microphone". Of course there is no sound cutoff, but
the pickup pattern favors sounds directly in front of the mic.
You have not really clarified what you want. If the road is two-way the mic
will certainly pick up sounds of traffic moving towards it and away from it
equally if the cars are in front of the mic. It will tend to pick up less
sound of cars off-axis, but they will be loud when passing directly in front
of the mic. I think it is almost impossible to isolate sounds in a certain
range, although sounds in that range could be maximized as compared to
sounds outside that range if the mic were carefully set up.
In terms of wireless: what you would want is a wireless transmitter and
receiver that would accept a standard mount microphone. Most professional
mics use a balanced connector called an XLR or Canon plug. Be aware however,
that many shotgun microphones require an external power supply and cannot be
plugged directly into a wireless transmitter, which does not supply this
"phantom" power. Your best bet would be to get a self-powered shotgun
mic--these have a battery incorporated into the body which supplies the
power, and can be used with normal wireless transmitters.
HTH,
Toby
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