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CMSIS DSP Library

Jagadeesh Konakalla
Note: This was originally posted on 27th November 2012 at http://forums.arm.com

Hi,

I am new user to CMSIS. I have gone through the DSP library function. I am interested in fixed point arithemetic.

As per the documentation, i have understood that Q7, Q15 and Q31 formats are only supported. Is that correct ?


I would like to multiply different Q formats. Example : For multiplication, input 1 is Q17, input2 is Q 27 and output required is Q19.

How can we use the DSP library functions such as arm_mult_q31 for the example mentioned ?
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  • Note: This was originally posted on 28th November 2012 at http://forums.arm.com

    I agree with your comments.

    But in previous, we worked with IQmath library provided by TI. This IQ math library allows the user to multiply different Q formats and allows takes about rounding and saturation of the result.

    My question whether this CMSIS DSP libarary provides the same capabilities as IQmath ?
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  • Note: This was originally posted on 28th November 2012 at http://forums.arm.com

    I agree with your comments.

    But in previous, we worked with IQmath library provided by TI. This IQ math library allows the user to multiply different Q formats and allows takes about rounding and saturation of the result.

    My question whether this CMSIS DSP libarary provides the same capabilities as IQmath ?
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