Method and apparatus for zero-mixing spectrum analysis

Details Method and apparatus for zero-mixing spectrum analysis Method and apparatus for zero-mixing spectrum analysis

2006-08-29

2006-08-29

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S451000

Reexamination Certificate

active

07099016

ABSTRACT:
An apparatus (1) for analyzing a spectrum of an input signal (x(t)) having at least one line with a center frequency (@s) comprises a mixer (2) for zero-mixing the input signal (x(t)) to produce a base band signal (z(t)) by sweeping a local oscillator frequency (@s) generated by a local oscillator (3) and a resolution filter (4) for filtering the base band signal (z(t)) to produce a filtered base band signal (y(t)). Detector means (7) detects the time of occurrence (ti), the duration (ΔTi) and the maximum value (y′i) of several halfwaves of the filtered base band signal (y(t)). Envelope reconstruction means (6) reconstructs the envelope (E(@)) of the spectrum of the input signal (x(t)) by using an estimated amplitude at an estimated center frequency of each line of the input signal (x(t)). The estimated center frequency and the estimated amplitude are calculated from the time of occurrence (ti), the duration (ΔTi) and the maximum value (y′i) detected by the detector means (7) from the several halfwaves of the filtered base band signal (y(t)).

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