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Re: SONY PCM-D50 field recordings with inbuilt mics

Subject: Re: SONY PCM-D50 field recordings with inbuilt mics
From: "Michael Oates" msohooates
Date: Thu Jul 23, 2009 4:44 am ((PDT))
Raimund,

That is fantastic, many thanks for sharing that tip. I just tried it with 
Audition 3 and
it works.

For Audition 3: Go to the Edit menu and select "Adjust Sample Rate" put it to 
6000 Hz.
This can be repeated to get even lower.

Mike

>Hi Phil and Patrick,
>
>yes, it is indeed very simple to make this kind of conversion. I used the 
>(expensive) Avisoft-SASLab Pro software 
>(http://www.avisoft.com/soundanalysis.htm) for this, but it can also be made 
>with any other sound editing software such as Audacity. On Audacity, the 
>corresponding command is titled "Set Rate" > "Other...", which can be found on 
>the pop-up menu that appears when you click at the tiny black arrow on the 
>left of the track representation.
>
>I just investigated the frequency response of the PCM D-50 microphones a bit 
>further. They seem to be quite sensitive up to about 30 kHz. That's the reason 
>why they worked so good for the relatively low-frequency echolocation calls of 
>the Noctule bat. They still work beyond 30 kHz, but the sensitivity drops 
>significantly at those frequencies. So, the results would not be as good when 
>recording other bat species such the Pipistrelle for instance.
>
>Regards,
>Raimund  
>
>--- In  ". m u r m e r ." <> wrote:
>>
>> Raimund Specht wrote:
>> > 2. Modifying the sample rate attribute in the file header from 96 kHz to 
>> > 5.5 kHz, which stretches the time scale by a factor of 17.45 = 96 kHz / 
>> > 5.5 kHz. As a result, the ultrasonic bat calls move down into our hearing 
>> > range.
>> 
>> 
>> forgive me if this is a foolish question, but how do you directly modify 
>> the sample rate attribute in a soundfile header?  do you need a 
>> particular piece of software?  this seems like a spookily simple way to 
>> do a basic time-stretch, quite enticing...
>> 
>> best,
>> patrick
>> 
>> -- 
>
>
>--- In  Philip Tyler <> wrote:
>>
>> Hi Raimund
>> 
>> Many thanks for the info. I understand everything except the "Modifying the 
>> sample rate attribute in the file header"?
>> 
>> What do you use to do that, if I may ask?
>> 
>> Regards 
>> 
>> Phil
>






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