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Ki sa ki se modifye Frekans modulation (MFM)?
Date:2016/4/18 16:12:46 Hits:
Definisyon - Ki sa ki modifye modulation Frekans (MFM) vle di?
Modifye batman frekans (MFM) se yon metòd pou kodaj done dijital sou medya mayetik. MFM te itilize ak pyès ki nan konpitè byen bonè, ki gen ladan Pwogram kontwòl pou Mikrokonpute (CP / Gason), IBM PC konpatib ak amiga PC yo.MFM te itilize sou 3.5-pous ak disk 5.25-pous, oswa floppys, ki gen to transfere done (DTR) nan 250 500 Play, menm jan tou MFM ST-506 disk difisil jiska senk Mbps. MFM se kounye a demode, ak eksepsyon de 1.44 MB disk lage lage.
Paske MFM te gen de fwa kapasite a nan batman frekans anvan (FM) kodaj, li te konnen tou kòm "dansite doub."
Kòm yon kodaj konplo ranfòse batman frekans (FM), MFM diminye ki kantite ranvèrseman règ enkòpore pou pulsasyon revèy, sa ki pèmèt pou pi gwo dansite done. Lè yo konpare ak FM, MFM double lineyè dansite ti jan ak diminye dansite linear vè règ san yo pa ogmante dansite mayetik anrejistre. Anplis de sa, itilize kòd la anrejistreman sèlman senkronize pulsasyon revèy si Bits done yo pa disponib.
MFM kodaj vin bay yon moun ki pa retounen-a-zewo (NRZ) ti jan kouran ki kode lè ekri nan medya mayetik. Se ti jan nan 1 karakterize pa yon tranzisyon mayetik, ki se nòmalman yon vòltaj pozitif. Yon ti jan 0 pa gen yon tranzisyon mayetik ak se jeneralman yon vòltaj negatif. Nan mwayèn, chak ti jan done se kode kòm de Bits ak kèk separateur oswa limit nan kòmansman yon sekans a ak fen.
MFM gen senk règ debaz kodaj, jan sa a:
• tranzisyon Flux yo pa janm nan pwen milye yon ti jan 0 a.
• tranzisyon Flux yo toujou nan pwen milye yon ti jan 1 a.
• Flux tranzisyon yo pa janm nan pwen depa yon ti jan 1 nan oswa nan pwen final yon ti jan 1 a.
• Limit la kouri longè se selil nan de Bits, ki fasilite kontinyèl ranvèrseman règ ant de Bits 0 vwazen.
• Yo espas ki anba la a dènye ti jan nan done ak plon-an jis anvan premye ti jan nan nan done anrejistre ak clocking Bits (0s).
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