Hello Edgar,

you wrote:

> I expect that the signal composition will be different, but can not

seem to get the spectrum colours to be as smooth as those in the above

image.

<

Difficult to say how the 'AWESOME' software avoids the steps in the

spectrogram colours when zooming in so deeply.

Math dictates the tradeoff between spectral and time resolution - it's

impossible to achieve a true time resolution of "fractions of a bit

time" and -at the same time- a frequency resolution of "fractions of the

frequency shift" (if MSK is considered FSK with a modulation index of 0.5).

Possible ways they do it:

A - individually interpolate the colour for each pixel in the

spectrogram, even if those pixels fall inside the same FFT frequency bin

B - use a radically different FFT windowing function (which is almost

zero within most of the FFT window) and a much longer FFT. The net

result would be similar as A : spectral smearing between neighbouring

FFT bins.

Since there is no such FFT windowing function hard-coded in SL (yet),

the only way to achive both high resolution in the time- and frequency

domain is to use the 'reassigned spectrogram' as already suggested here

some time ago.

All the best,

Wolf .