  Recent observations and theoretical studies support the theory that
solar-type oscillations are intrinsically stable but excited stochastically by
the turbulent convection in the outer layers of the star. The acoustic noise
generated by the convective motion depends on the details of the turbulent
energy spectrum. In this paper we present a general formulation for the
acoustic noise generation rate based on previous works by other authors. In
this general formulation any model for the spatial turbulent energy spectrum
and for the turbulent time spectrum can be assumed. We compute acoustic power
spectra and oscillation amplitudes of radial oscillations for models of the Sun
and Procyon A. The results are compared with recent observations.
