Certain Digital Quadrature Techniques for Bandlimited Signals
O. D. Grace · The Journal of the Acoustical Society of America · 1973
Practical methods of signal processing of bandpass signals by digital quadrature methods are discussed. These methods assume a sufficiently dense uniform sampling of a bandpass signal and include extractions of quadrature samplings from uniform samplings; polynomial interpolations, in which the sampling frequencies fs>πW ensure exact interpolation; and error corrections for interpolations over a finite data base. Also included are applications to the problems of measuring the instantaneous envelope, phase, and frequency of bandpass signals.