Frequency-Slope Estimation and Its Application to Parameter Estimation for Non-Stationary Sinusoids

摘要

We have shown that an efficient bias-reduction strategy for the estimation of sinusoidal parameters consists of a frequency-slope estimation and demodulation prior to application of the standard QIFFT estimator. The procedure significantly reduces the bias of the standard estimator. It does not require the use of a Gaussian analysis window, and it works for a much larger range of modulation depths than a recently proposed algorithm. By investigating the reduction in the residual energy that can be obtained for a vibrato signal, we have shown that the proposed enhanced demodulation estimator effectively works in real-world situations. It has been shown that, compared to the standard QIFFT estimator, the reduction of the residual error depends on the frequency range and can be as large as 6-9 dB.