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From: BLAKE on 12 Apr 2010 09:28
Hello,

I am using sptool to analyze data taken from accelerometers. I have been getting all negative values on the Y-axis. The fft looks normal but again is all below zero. I was lead to believe that sptool would display positive fft values. Any knowledge as to why I am getting these results would be greatly appreciated.
From: Mark Shore on 12 Apr 2010 09:56
"BLAKE " <blake.ivy(a)navy.mil> wrote in message <hpv754$8ad$1(a)fred.mathworks.com>...
> Hello,
>
> I am using sptool to analyze data taken from accelerometers. I have been getting all negative values on the Y-axis. The fft looks normal but again is all below zero. I was lead to believe that sptool would display positive fft values. Any knowledge as to why I am getting these results would be greatly appreciated.

Log scale in dB.
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