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Popup noise in recorded sound when long-time record with Voyager Legend

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Hello,

I plan to use Voyager Legend for recording medical consultation of doctor, and want to off-line voice recognize it.

I can record the voice from the device '2- Plantronics BT300' in Windows PC.

( It need to play the 'silence wav' at play device of Voyager Legend to keep connected the headset for long-time recording.)

 

 

Up to this point seems no problem. But, there can be found irregular popup noise in the save file of long time recording. ( Approximately 4 ~ 5 times per minute )

This popup noise could be nothing in human communication, but it is critical for voice recognition input.

 

Is there any solution for this problem ?

 

Thanks.

 

Recording Sample (2015/02/02 ~ 2015/03/04)

16 KHz, 16 bit, mono PCM ( I recorded radio sound for test. )

 

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