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关于C28x Fixed Point DSP Library.pdf 中的Q31

TI数字信号处理库,出现了一个Q31的格式,按照IQ格式的理解就是小数点在第31位上,那具体是什么意思呢?

手册里说需要转换成Q31格式,搞得我一头雾水 .

例程里,有这么一句 xn=(long)(2147483648*(sin(Rad) + cos(Rad*2.3567))/2);          //Q31

从long的角度来看,第一位始终是1,也就是始终是负值. 具体请看附件

页面提取自-C28x_Fixed_Point_Library_v1_01.pdf