Matalikidwe kusinthasintha mawu ndi kusintha kwake

Gulu la wailesi aliyense masiku ano ali AM-FM lophimba. Monga ulamuliro, ogula wamba sindikuganiza zoti tanthauzo la makalata amenewa, ndi wokwanira kumbukirani kuti FM ndi FM amalikonda wailesi yomwe womwaza mu sitiriyo ndi khalidwe labwino, ndi NDINE mukhoza kugwira "yowunikira". Ngati ife tifika ku mfundo luso osachepera kwa mlingo wosuta Buku, inu mudzapeza kuti AM - ndi matalikidwe kusinthasintha mawu ndi FM - pafupipafupi. Kodi zosiyana?

Kuti adawomba ku wokamba wailesi nyimbo phokoso mbendera ayenera kukumana ndi kusintha zinthu zina. Mu malo oyamba ayenera kukhala oyenera kulengezetsa pa wailesi. Matalikidwe kusinthasintha mawu ndi njira yoyamba kuti, signalers, akatswiri aphunzira popereka mapulogalamu mawu ndi nyimbo pa wailesi. American Fessenden mu 1906, mothandizidwa ndi makina oscillation jenereta anali 50 kHz, anakhala munthu woyamba mu mbiri ya nthandala pafupipafupi. Kenako anaganiza vuto linalake mu njira zosavuta, poonetsa koyilo maikolofoni linanena bungwe. Mchikakamizo cha phokoso pa mpweya ufa mkati bellow zinasintha kukana ake, ndi ukulu wa chizindikiro amaperekedwa kwa jenereta kwa kupatsira mlongoti, utachepa kapena kuchuluka malingana iwo. Popeza matalikidwe kusinthasintha mawu wakhala anatulukira, i.e. kusintha matalikidwe a chotengera chizindikiro kuti apange envelopu mzere limafanana ndi mawonekedwe a mbendera opatsirana. Mu makumi a, magudumu makina anali kuimirira ndi zinthu zosiyanasiyana za nyale. Izi achepetsa kukula ndi kulemera transmitters.

Pafupipafupi kusinthasintha mawu isiyana matalikidwe kuti kuchuluka kwa chonyamulira yoweyula sichitha, kusintha pafupipafupi ake. Monga m'munsi ndi circuitry pakompyuta pali njira zina zomwe mfundo mbendera ndi "kukhala" pafupipafupi wailesi. Gawo kusintha ndi patsogolo ufulu anapatsidwa dzina la gawo ndi zimachitika m'lifupi kusinthasintha mawu. Zinaoneka kuti matalikidwe kusinthasintha mawu wailesi wailesi ngati njira akale. Koma zinthu sizinayende, iwo anapitiriza ililipo, ngakhale mu maonekedwe pang'ono kusinthidwa.

Kukula akufuna kudziwa machulukitsidwe pafupipafupi kulimbikitsa akatswiri kufunafuna njira kuonjezera chiwerengero cha njira opatsirana pa timaganiza mofanana. Features ya Mipikisano njira wailesi anatsimikiza Lingaliro Lovomerezeka Kotel'nikova ndi Nyquist chotchinga Komabe, kuwonjezera pa quantization chizindikiro, n'zotheka kuonjezera katundu deta pa kulankhulana njira ndi kusintha gawo. Quadrature matalikidwe kusinthasintha mawu - njira kwa HIV zimenezi, amene pafupipafupi chomwecho imafalikira chizindikiro osiyana, gawo ankatembenukira wachibale wina ndi mzake ndi madigiri 90. Njira zinayi gawo kapena osakaniza a zigawo ziwiri quadrature anafotokoza trigonometric ntchito uchimo ndi Ko, choncho dzina.

Quadrature matalikidwe kusinthasintha mawu chimagwiritsidwa ntchito kulankhulana yadigito. Ndi chikhalidwe chake ndi osakaniza gawo ndi matalikidwe kusinthasintha mawu.