Lecture 13 : Pole / Zero Diagrams and All Pass Systems
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چکیده
A chirp signal x(t) = e j2π ct2 2 = A(t)e jθ(t) has instantaneous frequency fx(t) = ct units of Hz (or radians, etc.) so instantaneous frequency for a linear FM chirp is a linear function of time t. The frequency is increasing linearly with time, with slope c. Note: if there are more than one simultaneous frequency components, at a particular time, then it is hard to analyze this way. But OK for FM signals. x(t) = Acos(θ(t)) dθ(t) dt = ωc + kψ(t) so θ(t) = ωct + ∫ t
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تاریخ انتشار 2001