The spectrum analyzer null spectrum analyzer which possesses the adjustment possible resolution filter

摘要

This invention, conjugate complex input signal v* (t) the mixer which the baseband signal x (t) mixing is done (3) and the resolution filter which baseband signal x (t) narrow band filtering is done the spectrum analyzer which it has (4) regards (1). According to this invention, the resolution filter (4), has, discrete impulse response (i) of complex, C₁, C₂, and C₃ is constant, k is scan exponent, T _a is scan period, h _allp (t) e ^{j (f)} is Fourier re-conversion, (f), is each phase response which changes with the frequency in the transfer function of the resolution filter, k₀ is free fluctuation parameter.