Converting from floating point to fixed point.
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How can i convert from floating point to two's complement? I need to convert a vector of filter coefficients from Filter Designer but I do not know how.
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Walter Roberson
2022-9-27
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The Fixed Point Toolbox fi() can be used to create a variety of fixed point formats.
If you need to match a particular hardware fixed point format for a dsp then we would need to know the details of the representation.
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format long g
BitsAfterDecimalPoint = 12;
Value = -0.0126842654631061924064283630286809057
encoded = int16(Value * 2^BitsAfterDecimalPoint)
decoded = double(encoded) / 2^BitsAfterDecimalPoint
abs(Value - decoded)
There is a limit to how much precision you can get with 16 bits...
BitsAfterDecimalPoint = 16;
encoded = int16(Value * 2^BitsAfterDecimalPoint)
decoded = double(encoded) / 2^BitsAfterDecimalPoint
abs(Value - decoded)
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