I have finally figured out the long-term mystery, annoying, and unanswered issue with my recording noise in Camtasia.
When I enounted it for the first time, I thought it was an issue related to my mic system.
So complained about the strange noise issue with my voice recording to Shure at first, but after their test by technicians at the lab in korea, they claimed both of the mic and its interface (both from Shure) were working properly.
After I found the noise issue still appeared on other computer just in case, I almost gave up....
Recently I upgraded to 2020 camtasia, it still shows the same noise issue.
So I have changed my entire audio system to Shure SM58 + Rode AI-1 Audio interface.
But the same issue still persisted....
Then today I was playing with the audio sample and bit rates on my computer,
and found the noise with my voice recorded in Camtasia is related to it.
The setup of 24bit with 44.1khz causes no noise, but if it's switched to the 24 bit 48khz, that annoying noise appears~!
It seems it is related to your trec file system.
The old school method recording in avi should be back to avoid this kind issue, or fix trec...
For your information, let me leave the youtube link showing the noise issue, which was recorded in korean because it was for Shure in korea, but you can still hear its strange noise with my voice. It only appears when I am talking, not in silent background.
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