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i dont konw why the designer do this： avSigCReg(0) <= sigCReg(13) & sigCReg(13) & sigCReg(13) & sigCReg(13) & sigCReg;
avSigCReg is is array (0 to 9) of signed(17 downto 0)，
I think this code is calculate the average value of 10 signal .
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The common arithmetic average of N samples is calculated by summing the samples and then dividing by N.
Since division by a number which is not power of 2 is resource consuming, you can avoid it by discarding the N factor which is actually not relevant since it's simply a constant multiplier.
The multiple & sigCReg(13) simply serves for the purpose of sign extending the 14 bit ADC sample to the 18 bit wide sum.
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