Programmer Guide/SPU Reference/MULACRTALOG

MULACRTALOG

Usage:

MULACRTALOG L D WFUNC WTYPE X1 .. X4 REF AVR OUT A1 .. A4 Y1 .. Y4

Inputs:

L

The frame length in samples (number)

D

The hop size in samples (number), where D <= L.

WFUNC

The window function (string). See WINDOW for details.

WTYPE

The window type. The following values are supported:

0 - dual

1 - tight

A1-4

The input signals (vector) with length D

REF

The reference amplitude for dB conversion

AVR

The exponential averaging factor (0<=AVR<=1).

Outputs:

A1-4

The log. amplitude spectrum (vector)

Y1-4

The reconstructed signals (overlap-add) used for the spectrum computation (vector) with length L

Function:

Gabor analysis for frame multipliers, optimized for real-time / stereo. This atom is used to compute the spectra displayed by the S_TOOLS-STx script ReTiSiMo.

Notes:

Averaging: A[i,t] = A[i,t-1]*sqrt(AVR) + spectrum[i,t]*(1-sqrt(AVR))