pylab.psd without plot

Hello,

how can I use the pylab.psd-function without a matplotlib-Plot-figure
popping up?

Thanks
Lars

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Dipl.-Ing. Lars Friedrich
Optical Measurement Technology
Department of Microsystems Engineering -- IMTEK
University of Freiburg
Georges-Köhler-Allee 102
D-79110 Freiburg
Germany

phone: +49-761-203-7531
fax: +49-761-203-7537
room: 01 088
email: lfriedri@...1435...