topic About NXP DSPlib for LPC17XX and LPC13xx in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/About-NXP-DSPlib-for-LPC17XX-and-LPC13xx/m-p/516182#M1536 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by matthewcn on Mon May 30 01:11:14 MST 2016</STRONG><BR /><SPAN>hi, </SPAN><BR /><BR /><SPAN>I am using lpc1758 work as fft transformation and fft inverse transformation, after i downloaded &lt;&lt;NXP DSP Library 2.0&gt;&gt;</SPAN><BR /><SPAN>in pdf file &lt;&lt;AN10913_3.pdf&gt;&gt;, there is only FFT function, not FFT inverse function.</SPAN><BR /><BR /><SPAN>my question is:</SPAN><BR /><BR /><SPAN>(1) in FFT function, the parameter type is short int, how it represent decimal? is it Q15?</SPAN><BR /><SPAN>(2) why there is no fft inverse function, how can i achieve fft inverse transformation?</SPAN><BR /><BR /><SPAN>thank you!</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:25:54 GMT lpcware 2016-06-15T17:25:54Z About NXP DSPlib for LPC17XX and LPC13xx https://community.nxp.com/t5/LPC-Microcontrollers/About-NXP-DSPlib-for-LPC17XX-and-LPC13xx/m-p/516182#M1536 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by matthewcn on Mon May 30 01:11:14 MST 2016</STRONG><BR /><SPAN>hi, </SPAN><BR /><BR /><SPAN>I am using lpc1758 work as fft transformation and fft inverse transformation, after i downloaded &lt;&lt;NXP DSP Library 2.0&gt;&gt;</SPAN><BR /><SPAN>in pdf file &lt;&lt;AN10913_3.pdf&gt;&gt;, there is only FFT function, not FFT inverse function.</SPAN><BR /><BR /><SPAN>my question is:</SPAN><BR /><BR /><SPAN>(1) in FFT function, the parameter type is short int, how it represent decimal? is it Q15?</SPAN><BR /><SPAN>(2) why there is no fft inverse function, how can i achieve fft inverse transformation?</SPAN><BR /><BR /><SPAN>thank you!</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:25:54 GMT https://community.nxp.com/t5/LPC-Microcontrollers/About-NXP-DSPlib-for-LPC17XX-and-LPC13xx/m-p/516182#M1536 lpcware 2016-06-15T17:25:54Z Re: About NXP DSPlib for LPC17XX and LPC13xx https://community.nxp.com/t5/LPC-Microcontrollers/About-NXP-DSPlib-for-LPC17XX-and-LPC13xx/m-p/516183#M1537 <HTML><HEAD></HEAD><BODY><SPAN>bump</SPAN></BODY></HTML> Sun, 19 Jun 2016 01:12:08 GMT https://community.nxp.com/t5/LPC-Microcontrollers/About-NXP-DSPlib-for-LPC17XX-and-LPC13xx/m-p/516183#M1537 lpcware 2016-06-19T01:12:08Z