What i get, if i multiplier the spectrum with index?

Unity
1

Hey i have seen this on a tutorial

        spectrum = new float[(FftWindowSize / 2)];
        for (int i = 0; i < spectrumData.GetLength(0); i++)
        {
            for (int j = 0; j < spectrum.Length; j++)
                spectrum[j] += spectrumData[i][j] * (j + 1);
        }

what i get, if i multiplier the spectrum with index (i + 1)?
Can someone explane it me or send links of this topic?
Cant find anything and want understand it :frowning:

2

In this case, the index of i is used for the current channel.

https://fmod.com/resources/documentation-api?version=2.0&page=plugin-api-dsp.html#fmod_dsp_parameter_fft