Radio receiver

Details Radio receiver Radio receiver

H - Electricity

03

D

329/15, 329/16

H03D 3/00 (2006.01) H04L 27/152 (2006.01) H03D 1/22 (2006.01)

Patent

CA 1239449

RADIO RECEIVER Abstract of the Disclosure A radio receiver for frequency modulated signals in which direct conversion techniques are used to provide zero I.F. quadrature baseband signals I & Q. The I & Q signals are limited (11,12) to form square wave signals and pulse forming networks (13,14) derive pulse sequences the frequencies of which represent the polarity changes in the square wave signals. Each square wave is multiplied (15,16) by the pulse sequence derived from the other square wave to produce a unipolar pulse train. The two unipolar pulse trains are combined (17) to give a digital output signal the frequency of which is equal to the sum of the frequencies of the two pulse trains. Low pass filtering the output signal produces a simulation of the original baseband modulation.

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