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2. Re: High Sample Rates

Subject: 2. Re: High Sample Rates
From: "Michael Oates" msohooates
Date: Thu Aug 20, 2009 3:53 am ((PDT))
Vicki,

I just use Audition 3 on a PC and used the spectral display and made a scre=
en shot.

I think manufacturers don't say they go above a certain frequency possibly =
because the
response may not be linear or easily repeatable between each mic. Also not =
many people
want to use it above 20kHz anyway.

Regards,

Mike

>Mike,
>
>What a fascinating example!  What software did you use to display
>frequencies up to 90 kHz?  (I am on a Mac).  I don't think Raven Lite
>goes above 20 kHz.
>
>If the MKH 20 mic goes so far above 20 kHz, then why on earth don't
>the manufacturers say so?
>
>Thanks again for the example!  I will try for bats when summer comes.
>
>Vicki
>
>
>
>On 20/08/2009, at 3:59 PM, Michael Oates wrote:
>
>> Hi,
>>
>> Just because a manufacture says the mics response goes up to 20kHz,
>> does not mean it will
>> not allow you record higher frequencies.
>>
>> Take the following as an example that I recorded last month: The
>> Sennheiser MKH20
>> published response is 12Hz-20,000Hz yet when I recorded in my
>> garden as a test I recorded
>> a bat which had a strong signal ranging from 48kHz-65kHz. This was
>> recorded at 192kbps on
>> a SD 744T. I did see the bat visually, but not well enough to
>> identify it.
>>
>> See this sonogram: http://www.mikeoates.org/wildlife/img/sonogram-
>> bat.jpg
>>
>> Ok this is a particular good mic, but what ever you have just try
>> it, it may work well
>> above 20kHz.
>>
>> While I am here, can anyone identify this bat from the image, I
>> believe it's a Pipistrelle
>> but it has a higher frequency than other sonograms I have seen,
>> could it be a Soprano
>> Pipistrelle?
>>
>> Mike
>>
>>
>>> All,
>>>
>>> Is there any point in using a higher sample rate if the mics we use
>>> only go up to 20 kHz?  We would not be able to capture animal sounds
>>> above 20 kHz no matter what the settings on the recorder.
>>>
>>> I note that the Sennheiser MKH 800 goes up to 50 kHz but is very
>>> expensive.  Most other Sennheiser mics only go up to 20 kHz.
>>>
>>> When Raimund recorded Noctule bats (20-45 kHz) with inbuilt mics on a
>>> Sony PCM D50 recorder, he noted that the mic sensitivity went up to
>>> 30 kHz.  Does anyone know what the inbuilt mic sensitivity is for the
>>> Olympus LS-10?  I cannot find that in the specifications.
>>>
>>> Vicki Powys
>>>
>>>
>>> On 20/08/2009, at 2:42 AM, John Hartog wrote:
>>>
>>>> Hi Curt,
>>>> I don't see the bottom line yet.
>>>> How does metadata being important suggest that high sample rates
>>>> are not? Maybe they are both important. These listening tests that
>>>> we refer to are about marketing music only, and they only show we
>>>> think we can hear no difference. There are many things that we
>>>> cannot consciously describe that do indeed affect mind and body.
>>>> And then there is species and ecosystem documentation - what about
>>>> all that communication above 20k?
>>>>
>>>> John Hartog
>>
>>
>>






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