???????????? ?????? ??? ??????? ???? ????????? ??????????? ??? ??? ???????? ???? ????????? ? ???? ????????? ?? ??????????? ??? ????????????? ?????.??????????? ??? ??????? ??? ??????? ?????? ??????????, ?? ?????????? ? ?????? ?? ??????? ?? ?? ????????? ???????????? ??? ????????.Far more lately invented, a modem modulates an analog "carrier" sign (in