| http://www.w3.org/ns/prov#value | - ed by the expression ai =cos {ωIF t+kf ∫t A(t)*dt+Ω+π*(i /n)} where ??IF, kf and ?? are constants, n is a positive integer greater than or equal to 2 and i takes the values of all positive integers up to and including n, and multiplier means for multiplying said n signals together and thus producing said heterodyning stage output signal wherein said message signal A(t) is modu
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