60 results about "Quadrature filter" patented technology

In signal processing, a quadrature filter q(t) is the analytic representation of the impulse response f(t) of a real-valued filter: q(t)=fₐ(t)=(δ(t)+i/πt)*f(t) If the quadrature filter q(t) is applied to a signal s(t), the result is h(t)=(q*s)(t)=(δ(t)+i/πt)*f(t)*s(t) which implies that h(t) is the analytic representation of (f*s)(t). Since q is an analytic signal, it is either zero or complex-valued.