see the comments from the function expert:

Description of the Demodulator module:

To demodulate the complex input signal, the demodulator performs the following steps:

1) Calculate the derivate of the phase of the input signal. That is done by a complex multiplication with the conjugate of the previous sample.

ippsConj_32fc(complexIn, conjugatedIn+1, BLOCK_LENGTH);
ippsMul_32fc(complexIn, conjugatedIn, multiplyResult, BLOCK_LENGTH);

2) Calculate the phase of the resulting complex sample

ippsPhase_32fc(multiplyResult, angleOut,BLOCK_LENGTH);

3) The output you get here ranges from pi to pi, so, as we want a value between -1 and 1, we have to multiply with 1/pi (or for fixed point: 32768/pi).

ippsMulC_32f_I(Scale, angleOut,BLOCK_LENGTH);

That`s all.

Below is the sequence of IPP calls that emulates this function behavior:

//START
ippsRealToCplx_16s();
ippsConvert_16s32f();
ippsMulC_32f_I();//scale to -1 to 1
ippsConj_32fc();
ippsMul_32fc();
ippsPhase_32fc();
ippsMulC_32f_I(); //scale with 32768/pi to limit demodulator output to fixed point +1/-1 in 0.15
//now we will need to go fixed point again
ippsConvert_32f16s_Sfs();
//END

Thanks,
Chao

what does the parameter "pDlyPoint" mean? I don't quite understand the annotation.Can somebody give me a example of the use of the function, thanks a lot.