In this paper we introduce a simple, computationally inxepentsive, adaptive recursive structure for enhancing bandpass signals highly corrupted by broad-band noise. This adaptive algorithm, enhancing input signals, enables us to estimate the center frequency and the bandwidth of the input signal. In addition, an important feature of the proposed structure is that the conventional bias existing in the estimated frequency and bandwidth of the previously proposed structure will be canceled using an appropriate postfilter. Besides, the enhancement of multiple adjacent sinusoids can be obtained by adaptive adjustment of the bandwidth of the simple bandpass filter. The effects of the proposed postfilter in canceling the bias of the center frequency and bandwidth will be demonstrated through computer simulation.

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