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====ADPAR1====

The spectral weighting (if AW=1) and the frequency range truncation (FMIN .. FMAX) is applied to all input spectra. The further processing of the spectra depends on the selected <var>TYPE</var>.

<var>TYPE</var>=<code>0</code>

The RMS energy (in dB) of the spectrum (band) is computed and stored in the output vector <var>Y</var>.

<var>TYPE</var>=<code>1</code>|<code>2</code>

The pre-processed spectra are converted to dB and copied to the output array <var>SPG</var> (1 row per spectrum).

<var>TYPE</var>=<code>2</code>

After collecting all input spectra, the following descriptors are computed.

Y[i,0] = rms - RMS energy of the spectrum (dB)

Y[i,1] = am - mean amplitude of the spectrum (dB)

Y[i,2] = ad - standard deviation of the spectrum (dB)

Y[i,3] = sl - spectral slope (dB / kHz)

Y[i,4] = acno - mean amplitude of the normalized spectrum (dB)

Y[i,5] = fcno - spectral centroid frequency (Hz)

Y[i,6] = spno - spectral spread

Y[i,7] = fx - spectral flux (1st order, correlation of spectrum i-1 and i)

Y[i,8] = skno - spectral skewness

Note: all descriptors with the subscript no are computed from the normalized spectrum. The spectra are normalized as follows:

<code>offset = max(</code><var>SPG</var><code>[*,*]) -</code> <var>ARANGE</var>if <var>A</var><code>[i,j]>offset</code>, then <var>A</var>no<code>[i,j]=</code><var>A</var><code>[i,j]-offset</code>otherwise, <var>A</var>no<code>[i,j] = 0</code>with: <code>i</code> = frameindex, <code>j</code> = frequency bin indexThis SPAtom was developed for the NOIDESc project in 2006.

=====Usage:=====

<code>ADPAR1 <var>TYPE</var> <var>N</var> <var>A</var> <var>AW</var> <var>AREF</var> <var>ARANGE</var> <var>DF</var> <var>FMIN</var> <var>FMAX</var></code>

=====Parameters:=====

;<var>TYPE</var>

:The following types are supported:

:<code>0</code> = RMS track
<code>1</code> = spectrogram
<code>2</code> = descriptors

;<var>N</var>

:The number of frames (><code>1</code>).

;<var>A</var>

:The linear amplitude spectrum.

;<var>AW</var>

:Apply amplitude weighting:

:<code>NONE</code>|<code>0</code> - no spectrum weighting

:<code>A</code>|<code>1</code> - spectrum weighting in dBA.

;<var>AREF</var>

:The reference amplitude (linear).

;<var>ARANGE</var>

:The amplitude normalization range for descriptors (<var>TYPE</var>=<code>2</code>) in dB.

;<var>DF</var>

:The FFT frequency resolution in Hz.

;<var>FMIN, FMAX</var>

:The analysis frequency range.

=====Outputs:=====

;<var>Y</var>

:If <var>TYPE</var>==<code>0</code>, the rms track (rms[0..N-1]).

:If <var>TYPE</var>==<code>1</code>, the spectrogram array (one spectrum per row).

;<var>SPG</var>

:The logarithmic amplitude spectrogram.

:If <var>TYPE</var>=<code>0</code> - this is not initialized.

:If <var>TYPE</var>=<code>1</code>|<code>2</code> - <var>N</var> x <code>nf</code> (= the number of frequency bins in the selected range).

Programmer Guide/SPU Reference/ADPAR1 - Revision history

Admin: 1 revision: Initial import

193.171.195.8: initial import