Q is a fixed point number format where the number of fractional bits is specified
s 3 12
[0][010].[0100.0000.0000] = 0x2400
Float 1.125 - s3.12 Format -> 0x2400 -> 16bits
QNumberFormatNotation(s3.12, 2400): 1.125
s 3 12
[1][111].[1000.0000.0000] = 0xf800 -> -0.25
Float -0.25 - s3.12 Format -> 0xf800 -> 16bits
QNumberFormatNotation(s3.12, f800): -0.25