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Atari coding BBS
| Re: DSP frac arithmetic help |
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Posted by: dml
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Feb,27.2015-18:42
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Ok, not sure I understood the original problem :)
> In fact, I need to do :
> get 2 fractional values (each betwen -1 and 0.9999998), then
This should be ok.
$800000 = -1.0
$7fffff = 0.99999
All values in between can be multiplied. (but 1.0 is outside of the range)
> ABS val1
> ABS val2
This should be ok, if your values have been assigned to a, b (a1, b1 and fully sign extended into a2).
However if you moved your values into a1, b1 directly then you're screwed and abs will not behave as expected.
> val1*val1 + val2*val2
If you are squaring values, you shouldn't need abs? The result of sqr(x) is always positive anyway.
In any case, best find out whats going on with abs before you remove it. I suspect is a sign extend problem.
Hope that was a bit more helpful this time :)
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Topic
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Posted by
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Date
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DSP frac arithmetic help
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Laurent / Thadoss
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Feb,27.2015-15:03
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Re: DSP frac arithmetic help
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Laurent / Thadoss
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Feb,27.2015-15:08
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Re: DSP frac arithmetic help
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dml
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Feb,27.2015-15:28
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Re: DSP frac arithmetic help
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Laurent / Thadoss
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Feb,27.2015-18:32
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Re: DSP frac arithmetic help
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dml
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Feb,27.2015-18:42
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Re: DSP frac arithmetic help
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dml
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Feb,27.2015-18:46
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Re: DSP frac arithmetic help
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Splash/S1
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Feb,27.2015-20:21
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Re: DSP frac arithmetic help
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dml
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Feb,27.2015-20:38
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Re: DSP frac arithmetic help
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Laurent / Thadoss
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Feb,27.2015-20:42
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Re: DSP frac arithmetic help
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mikro
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Feb,28.2015-10:44
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Re: DSP frac arithmetic help
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dml
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Feb,28.2015-12:35
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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