Method and apparatus for downconverting signals transmitted using a plurality of modulation formats to a common intermediate frequency range.

摘要

FIELD: radio engineering; mobile radio communication systems. ^ SUBSTANCE: receiver converts signals modulated by using various modulation formats and transmitted in various frequency bands and has, among other things, band selection filters for selecting desired frequency band; first step-down frequency changer connected to output of first band selection filter; second step-down frequency changer selectively connected to output of second or third band selection filter and provided with input for connecting frequency doubling circuit; voltage-controlled generator connected to input of first step-down converter and to input of frequency doubling circuit. ^ EFFECT: minimized hardware used in multiple-mode telephone sets. ^ 42 cl, 6 dwg