math_op.h

来自「通讯协议」· C头文件 代码 · 共 24 行

/*--------------------------------------------------------------------------*
 *                         MATH_OP.H	                                    *
 *--------------------------------------------------------------------------*
 *       Mathematical operations					                        *
 *--------------------------------------------------------------------------*/

Word32 Isqrt(                              /* (o) Q31 : output value (range: 0<=val<1)         */
     Word32 L_x                            /* (i) Q0  : input value  (range: 0<=val<=7fffffff) */
);
void Isqrt_n(
     Word32 * frac,                        /* (i/o) Q31: normalized value (1.0 < frac <= 0.5) */
     Word16 * exp                          /* (i/o)    : exponent (value = frac x 2^exponent) */
);
Word32 Pow2(                               /* (o) Q0  : result       (range: 0<=val<=0x7fffffff) */
     Word16 exponant,                      /* (i) Q0  : Integer part.      (range: 0<=val<=30)   */
     Word16 fraction                       /* (i) Q15 : Fractionnal part.  (range: 0.0<=val<1.0) */
);
Word32 Dot_product12(                      /* (o) Q31: normalized result (1 < val <= -1) */
     Word16 x[],                           /* (i) 12bits: x vector                       */
     Word16 y[],                           /* (i) 12bits: y vector                       */
     Word16 lg,                            /* (i)    : vector length                     */
     Word16 * exp                          /* (o)    : exponent of result (0..+30)       */
);