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US 4,358,733 AGranted
Spectrum analyzer without distinct band-pass filter components
AssigneeFujitsu Limited
InventorKeishi Hanahara
Life of this patent
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Abstract
In an n-band spectrum analyzer, separation of frequency bands is performed by n+1 low-pass (or high-pass) filters. The outputs of adjacent low-pass (or high-pass) filters are subtracted. The output of each subtraction circuit is smoothed by an accumulator.
Claims8
A device comprising:
- a plurality of filters each having separate single cut-off frequencies, said filters being arranged according to said cut-off frequencies;
- a plurality of squarers, each said squarer being operatively connected to a corresponding one of said filters;
- a plurality of subtraction circuits, each subtraction circuit having an output and having positive and negative inputs respectively, operatively connected to two corresponding adjacent ones of said squarers;
- and
- a plurality of accumulators, each of said plurality of accumulators being operatively connected to said output of a respective one of said subtraction circuits.
2 more elements
Dependencies are inferred from the claim text.