Rectification of different-color noise

The approach for generating a broad-band colored noise is proposed, which a llows the transition between "red" and "green" noise. The rectification of the noise with different colors characterized by the net current of a Brown ian particle moving in a ratchet-like potential is studied by using the dig ital simulation. The present noise is also compared with the harmonic noise . The results show that the average current reverses sign when the external noise is filtered off in the region of low frequencies to a sufficient ext ent. Finally, a parameter plane of the noise with the numerically estimated line of the current reversal is plotted. (C) 1999 Elsevier Science B.V. Al l rights reserved.