Tsev > Xov xwm > Ntsiab lus

Multiply Progressive Scan / Kev Txhim Kho Kev Txhim Kho

Nov 17, 2017

Cov IC1 (SAA4977H) rau kev tswj fais fab, nrog rau kev siv ntawm kev cai npav, kev tswj ntawm lwm yam kev sib txuas thiab kev sib koom tes

Lub luag hauj lwm ntawm kev ua hauj lwm, tab sis kuj nrog Y, U, V teeb liab ua ntej qhov kev hloov scan A / D hloov dua siab tshiab thiab tom qab D / A hloov dua siab tshiab

Nta.


IC2 (SAA4956TJ) yog ib tug 2.9MB nco nrog lub suab nrov tawm tshem tawm, IC4 (SAA4955TJ) yog

2.9 MB cov high-capacity teb teeb liab, uas yog lub luag haujlwm rau khaws cia ib daim duab ntawm cov duab kos, thiab IC1

Nyeem / sau cov lus txib hauv qab tswjhwm ntawm IC6 los sau lossis nyeem cov teeb liab duab.


IC6 (SAA4991WP) raws li qhov tseem ceeb ntawm kev ntsuas kev txhawj xeeb thiab kev them nqi zog ntawm kev sib cog ua ke.

  

Los ntawm daim duab demodulation IC TDA9321H 49 taw analog tso zis ci ntsa teeb liab xa mus rau IC1 tus 26 taw, thiab 51 taw ntawm TDA9321H tso tawm U, V teeb liab xa mus rau IC1 tus 28 taw, 30 feet, li 50Hz analog video teeb liab input.

 

Kab, daim teb sync mem tes los ntawm IC1 npo loj dua tshiab hauv TV, kev sib txig sib xyaw nrog kev sib txig / kev txhim kho kev zoo siab ntawm 22 feet, 20 feet yog qhia ua 50Hz field frequency frequency input signal.


Cov teeb meem no nyob rau hauv IC1 nrog A / D kev hloov siab thiab kev hloov zuj zus los hloov, hloov 8-ntsis digital Y teeb liab tawm ntawm 38 taw mus rau 45 ko taw IC1; 4 U, V teeb liab los ntawm IC1 tus 34 fais ~ 37 fais fab tuag, xa mus rau qhov chaw nco IC2.


Lub IC1 tsis tsuas yog ua A / D kev hloov ntawm 50Hz analog Y, U, V cov teeb liab ntawm qhov duab ntawm qhov kev tsim kho duab hluav taws xob, tab sis kuj ua kev soj ntsuam ntawm kev sib tsoo thiab cov teb sync pulses kom tau 100Hz interlaced scann los yog 50Hz hnyav cheb

Piav kom meej cov kab, qhov chaw sync pulse.


Multipitation Circuit Court SAA4991WP (IC6) tsis yog rau digital duab teeb tsa kab-los-kab hloov dua siab tshiab, tab sis kuj mus nqa tawm simulation suab paj nruag nyiaj.

Tom qab nws hloov 100Hz interlaced scanning los yog 50Hz scissors cov duab teeb liab mus rau 4: 1: 1 hom thiab xa rov qab mus rau IC1, IC1 tom qab tiv thaiv kev kos duab thiab discrete cosine txav xa peb 10 ntsis D / A converter,


Yog li txo rau analog Y, U, V Pib ntsais koj teeb tau tso tawm.

1.png