Ukushintshashintsha kwezwi Amplitude kanye ngcono yayo

Amajaji kwanoma iyiphi umsakazo yesimanje ine AM-FM inkinobho. Njengomthetho, abathengi abavamile ungacabangi mayelana yokuthi incazelo yalezi izincwadi, kwanele ukukhumbula ukuthi FM intandokazi esiteshini sakhe FM okuyinto osakaza ku-stereo kanye izinga enhle, futhi AM ungakwazi ukubamba "Lighthouse". Uma sithola nemininingwane yobuchwepheshe okungenani ezingeni imanyuwali yomsebenzisi, uzothola ukuthi AM - kuyinto ukushintshashintsha kwezwi amplitude FM - imvamisa. Uyini umehluko?

Ukuze kwakuzwakala kusukela ngomsakazo umculo isignali umsindo kumelwe ibhekane nezinguquko ezithile. Endaweni yokuqala kufanele wenziwe efanelekayo Umsakazo. Ukushintshashintsha kwezwi Amplitude kuyindlela yokuqala, signalers, onjiniyela wafunda ukuba adlulisele izinhlelo izwi nomculo emoyeni. American Fessenden ngo-1906, ngosizo mechanical oscillation generator kwaba 50 kHz, waba ngowokuqala emlandweni imvamisa yenethiwekhi. Okulandelayo wanquma nenkinga yezobuchwepheshe ngendlela elula, ngokubeka ikhoyili umbhobho okukhiphayo. Ngaphansi kwethonya amaza omsindo ku powder carbon ngaphakathi zibhonge washintsha ukumelana layo, futhi ubukhulu isiginali kusuka generator antenna okuxhunyanwa, kwehle noma ukwanda kwemithwalo kuncike kuzo. Njengoba ukushintshashintsha kwezwi amplitude iye yasungulwa, isb ushintsho amplitude we isignali yenethiwekhi ukuze ukwakha umugqa imvilophi oluhambisana ukuma isignali ngocansi. Esikhathini eko, ugesi mechanical abangu lwaludlula ngu-electron-isibani. Lokhu kwanciphisa kakhulu ubukhulu nesisindo yesimanjemanje.

Imvamisa ukushintshashintsha kwezwi + iyahluka kwenye amplitude ukuze kwenkululeko wave yenethiwekhi alushintshi, ukushintsha imvamisa yayo. Njengoba base busebenze ngogesi zikhona ezinye izindlela lapho isignali ulwazi "ahlale" on the imvamisa radio. Isigaba ushintsho kanye nomfutho latitude waqanjwa yesigaba uhlanganise ububanzi kwezwi. Kwakubonakala sengathi amplitude ukushintshashintsha kwezwi umsakazo yezokusakaza njengendlela iphelelwe yisikhathi. Kodwa izinto zizokwenzeka ehlukile, ke aye wasigcina isikhundla salo, nakuba ifomu ingasebenza modified.

Growing ukufunwa ulwazi ukugcwaliswa imvamisa ukhuthaze onjiniyela ukuba ufune izindlela zokuziphindiselela ukwandisa isibalo iziteshi ngobulili nombono ofanayo. Izici multi-isiteshi yezokusakaza kunqunywa theorem Kotel'nikova futhi Nyquist isithiyo, Nokho, ngaphezu quantization isignali, kungenzeka ukwandisa umthwalo idatha isiteshi zokuxhumana ngokushintsha isigaba. Quadrature amplitude ukushintshashintsha kwezwi - indlela yokudlulisela ezinjalo, lapho imvamisa efanayo idluliselwa izimpawu ezihlukahlukene, isigaba sigudluke isihlobo ukuba nomunye by 90 degrees. Amafomu a-isigaba ezine noma inhlanganisela izingxenye ezimbili quadrature echazwe Trigonometric Imisebenzi isono futhi cos, kungakho igama.

Quadrature amplitude ukushintshashintsha kwezwi kabanzi lisetshenziswe bezokuxhumana. Ngokwemvelo yayo kuba inhlanganisela isigaba nokuguquguquka kwezwi kwawo namandla awo.