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Posted by Steve King on 02/21/07 16:07
"Toby" <kymarto@hol.com> wrote in message
news:45dc1453$0$171$bb4e3ad8@newscene.com...
>
> <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
The problem with a shotgun microphone is that they are not very directional
at lower frequencies. It all depends on how much rejection is required. A
cardioid may give better results for rejecting sounds at 180 degrees.
Steve King
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