Analysis of the zero-crossing times of angle-modulated signals provides a computationally efficient means of implementing a number of processing functions, including demodulation and spectral estimation. Unfortunately, sampling of a bandlimited signal is typically accomplished using uniformly spaced amplitude samples rather than detecting the zero-crossing times. This paper investigates the use of linear interpolation to estimate zero-crossing times from the uniformly-sampled data. The statistical properties of the error due to interpolation, additive Gaussian noise and'quantization are each considered separately as a function of the sampling interval.
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