  We present a blind multi-detector multi-component spectral matching method
for all sky observations of the cosmic microwave background, working on the
spherical harmonics basis. The method allows to estimate on a set of
observation maps the power spectra of various components present in CMB data,
their contribution levels in each detector and the noise levels. The method
accounts for the instrumental effect of beam convolution. We have implemented
the method on all sky Planck simulations containing five components and white
noise, including beam smoothing effects.
