FIELD: computer engineering. SUBSTANCE: digital spectrum analyzer has an input, analogue low-pass filter 2, analogue-to-digital converter 3, two digital filters 4, 5 two cut-out frequency varying units 6, 7, subtracting unit 8, adder 11, multiplier 9, averaging unit 10, output 12 and synchronization unit 13. EFFECT: enhanced reliability. 3 dwg
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