This node converts multichannel complex spectra of Map<int, ObjectRef> type IDs into real power/amplitude spectra.
No files are required.
When to use
This node is used to convert complex spectra into real power/amplitude spectra when inputs are Map<int, ObjectRef> type. When inputs are of Matrix<complex<float> > type, use the PowerCalcForMatrix node.
Typical connection
Figure 6.107 shows an example of the usage of the PowerCalcForMap node. A Map<int, ObjectRef> type complex spectrum obtained from the MultiFFT node is converted into Map<int, ObjectRef> type power spectrum and input to the MelFilterBank node.
Parameter name |
Type |
Default value |
Unit |
Description |
POWER_TYPE |
POW |
Selection of power/amplitude spectra |
Input
: Map<int, ObjectRef> type. Complex matrices of Matrix<complex<float> > type are stored in the ObjectRef part.
Output
: Map<int, ObjectRef> type. Real matrices of power/absolute values are stored in the ObjectRef part for each element of the complex matrices of the inputs.
Parameter
: string type. Selection of power (POW) or amplitude (MAG) spectra for the output.
The real matrix Ni,j of the output for the complex matrix Mi,j of an input (i,j indicating the rows and columns of the index, respectively) is obtained as:
Ni,j | = | Mi,jM∗i,j (if POWER\_ TYPE=POW), | |||
Ni,j | = | abs(Mi,j) (if POWER\_ TYPE=MAG), |
Here, M∗i,j indicates the complex conjugate of Mi,j.