culation and this matches the textbook definition of the inverse FFT. </dd></dl>
<dl class="section user"><dt></dt><dd>Pre-initialized data structures containing twiddle factors and bit reversal tables are provided and defined in <code><a class="el" href="arm__const__structs_8h.html">arm_const_structs.h</a></code>. Include this header in your function and then pass one of the constant structures as an argument to arm_cfft_q31. For example: </dd></dl>
<dl class="section user"><dt></dt><dd><code>arm_cfft_q31(