Tim Hieu Ve TiVi

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Transcript of Tim Hieu Ve TiVi

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DTU

I HC DUY TN KHOA IN T VIN THNG

LI NI U....................................................................................................02 CHNG I : TNG QUAN V MY THU HNH01. Khi nim...............................................................................................................03 02. Lch s ra i........................................................................................................03 03. Phn loi...............................................................................................................04

Chng II : TM HIU V TIVI MU SONY KV-148501. Gii thiu chung.....................................................................................................06 02. S ca tivi SONY KV-1485.............................................................................06 03. Nguyn l hot ng ca cc khi.........................................................................10 04. Bn cht tn hiu v qu trnh x l tn hiu trong Tivi mu..................................11 05. Cu to, nguyn tc hot ng mn hnh mu........................................................13 06. Tm hiu v n hnh mu.....................................................................................14 07. B knh..................................................................................................................15

CHNG III : CC S C THNG GP V CCH KHC PHC01. Mn hnh ch cn mt vch sng ngang................................................................16 02. Mn nh b mo tuyn tnh dc, co di chn, dn trn u.................................16 03. Hnh b tri theo chiu dc.....................................................................................16 04. Hnh va va tri..............................................................................................17 05. Khng c in vo my, khng c ting, khng c mn sng................................17 06. Hnh nh b un o, c ting loa.......................................................................17 07. My khng thu c tn hiu, mn nh c nhiu khng c hnh...........................18 08. My thu c tn hiu nhng cc knh u b nhiu..............................................18 09. My thu c di UHF nhng khng thu c di VHF hoc ngc li..............19 10. My ang xem th di knh mt hnh.......................................................................19 11. C mn sng mn, khng c hnh, khng c nhiu.................................................20 12. Ti vi c hnh en trng nhng mt mu.................................................................20 13. C hnh, mt m thanh, khng c ting si loa...................................................21 14. Ting b r xen vo ting ni hoc ch c ting r khng c ting ni.................21

15. Cc trng hp khc......................................................................................22 DANH SCH NHM............................................................................23

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DTU

I HC DUY TN KHOA IN T VIN THNG

LI NI UNgy nay, cng vi s pht trin ca x hi. Khoa hc k thut ng mt vai tr quan trng. Vi bt k lnh vc hot ng no ca con ngi cng cn n thng tin. V vy trong vi thp k gn y c s bng n v thng tin v ang chuyn sang k nguyn cng ngh thng tin. Vit Nam, trong nhng nm gn y, khng ch thnh th m cn nng thn vng su, vng xa thng tin u n c. Tivi tr thnh mt phng tin gii tr cng nh l phng tin cp nhp thng tin. C th ni lch s pht trin ca tivi i i vi s pht trin trnh ca con ngi. Nhm p ng cc yu cu v thng tin, rt nhiu hng tp trung vo nghin cu v pht trin h thng tivi ngy cng tn tin, mang li s hi lng cho ngi s dng. Trong , SONY l mt hng in t ln Vit Nam, thc s lm hi lng ngi dng bng chnh cng ngh tin tin ca mnh. Qu trnh tham kho cc ti liu nghin cu v tivi mu SONY gip em thy r c phn no nhng li ch m ti ti mu SONY mang li cho ngi s dng. Do trong ti ny em ch yu nghin cu tng quan v tivi mu SONY KV- 1485MT. Vi thi gian c hn, nn trong ni dung khng trnh khi nhng thiu st nht nh, chng em rt mong c s ng gp kin ca cc thy c gio cng ca cc bn. Chng em xin chn thnh cm n.

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DTU

I HC DUY TN KHOA IN T VIN THNG

Chng I : TNG QUAN V MY THU HNH1. Khi nim v truyn hnh:Truyn hnh hay cn c gi l TV (Tivi) hay v tuyn truyn hnh (truyn hnh khng dy), my thu hnh, my pht hnh l h thng in t vin thng c kh nng thu nhn tn hiu sng v tn hiu qua ng cp chuyn thnh hnh nh v m thanh (truyn thanh truyn hnh) v l mt loi my pht hnh truyn ti ni dung ch yu bng hnh nh sng ng v m thanh km theo.

2. Lch s ra i v pht trin ca TiVi :S pht trin ca cng ngh truyn hnh c th c thc hin trn 2 phm vi: - Cc pht trin trn phng din c hc v in t hc, v cc pht trin hon ton trn in t hc. - S pht trin th hai l ngun gc ca cc tivi hin i, nhng nhng iu trn khng th thc hin nu khng c s pht hin v s thu hiu t h thng c kh.Mt sinh vin ngi c Paul Gottlieb Nipkow a ra pht kin h thng tivi c in t u tin nm 1885. Thit k quay a ca Nipkow c xem l chuyn i hnh nh thnh cc chm im. Tuy nhin, phi ti nm 1907, s pht minh ca cng ngh ng phng i mi gip cc thit k thnh hin thc.Trong thi im Constatin Perskyi xut t tivi trong mt xut bn ti Vin in t quc t Hi ch Quc t Paris vo 25 thng 8 nm 1900. Cc xut bn ca Perskyi tm tt li cng ngh c in t, cp n thnh qu ca Nipkow v cc ng s. Nm 1911, Boris Rosing v hc tr ca ng Vladimir Kosma Zworykin thnh cng trong vic to ra h thng tivi s dng b phn hnh gng pht hnh, theo Zworykin, "cc hnh rt th" qua cc dy ti ng in t Braun (ng cathode) trong u nhn. Cc hnh chuyn ng l khng th, bi v b phn hnh, c " nhy cm khng v cc phn t selen qu chm". Rosing b Stalin y n Arkhangelsk nm 1931 v qua i nm 1933, nhng Zworykin sau quay li lm vic cho RCA xy dng tivi in t, thit k ny sau b pht hin l vi phm bn quyn ca Philo Farnsworth, ngi cng b h thng pht hnh u tin t nm 1928 trc . Nm 1920, hai nh khoa hc M Charles Francis Jenkins v nh khoa hc Anh John Logie Baird to ra vt mu thnh cng u tin ca chic TV.Lp K13TVT Trang 3

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DTU

I HC DUY TN KHOA IN T VIN THNG

Nm 1927, mt ngi M tr tui l Philo Taylor Farnsworth pht trin thnh cng phin bn thng mi ng tia cc m nhm pht tn hiu truyn hnh in t v y l bc t ph trong ngh truyn hnh ca nhn loi.

Nm 1930, mt vi tiu chun ca cng ngh TV cng xut hin v cnh tranh thng tr th trng non tr ny. Mt trong nhng sn phm chim u th l chic EMI-Marconi. Nm 1950 c th chy 25 khung hnh trn mt giy v kh ph bin ti Anh. Mt tiu chun TV khc c th chy 30 khung hnh trn giy v ch yu pht trin ti M.

Chic TV thng mi thnh cng u tin bt u xut hin ti cc showroom M vo u nhng nm 1950. Ngay khi nhn thy ni dung trn TV c gi tr khai thc, cc cng ty lp tc lao vo chy ua trong ngnh truyn hnh. Thc t ny dn n s cn thit phi c quy nh v tn s pht sng ca cc knh.

Sc mnh ca TV l vic pht trc tip nhng bc i lch s ca nh du hnh M Neil Amstrong trn mt trng, ngy 20/1/1969. N lc pht trin TV mu xut hin t u nhng nm 1950 v chic u tin c hng RCA gii thiu nm 1954. Nhng phi n nhng nm 1960 vic bn cc TV mu mi bt u sinh li. Ti nm 1974 th TV mu tr thnh biu tng cho cc gia nh giu c ti M.

Nm 1959, hng Philco a vo th trng chic TV ch c mn hnh rng 2 inch v c th thu c sng radio. Nm 1980, ngnh truyn hnh M do 3 mng li chnh thng tr, trong khi khn gi ti cc nc chu u v chu b gii hn trong cc la chn chng trnh.

3. Phn loi : Theo nh sn xut : SAMSUNG LG TOSHIBA SONY Theo cng ngh : Ti Vi en trng TV CRT (mu)

TV LCD TV Plasma

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DTU

I HC DUY TN KHOA IN T VIN THNG

TV LED

TV 3D

Chng II TNG QUAN V TIVI MU SONY KV-1485* Cc ch tiu k thut ca tivi mu SONY KV-1485 H truyn hnh: M, B/G, I, D/K H mu: PAL, PAL60, NTSC4.43, NTSC3.58, SECAM Di tn s: H tivi VHF-L VHF-L UHF A2 A7

A6 A13

M

B/G E2 E4 E5 E12

I

D/K R1 R5 R6 R12

Tr khng u vo ng ten: 75 u vo AV : Video : 1Vp-p, 75 Audio : 500mV

Model KV- 1485 Cng sut ting ra 3W n hnh cm (inch) : 37(14) Trong lng (Kg) : 11kg S khi tng qut ca Ti vi mu v mt chc nng c th chia lm hai nhm

chnh nh sau : - Nhm th nht c chc nng to nh sng trn mn nh, bao gm khi ngun nui, khi qut dng v khi qut mnh , nhm ny hot ng trc . - Nhm th 2 c chc nng thu v x l tn hiu hnh nh v m thanh, bao gm : B knh & trung tn, khi chuyn mch AV, khi x l tn hiu chi, khi gii m mu, khi khuch i cng xut sc v khi ng ting , cc khi trong nhm ny hot ng sau nhm th nht.

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DTU

I HC DUY TN KHOA IN T VIN THNG

1. Gii thiu chung :Ngay t nhng giai on u ca truyn hnh, hng SONY a ra th trng cc tivi c c im khc hn vi cc tivi ca hng khc. C hai s khc bit c bn gia cc tivi ca hng SONY v cc tivi ca cc hng khc l: n Hnh Tnh lp ln Hng SONY to ra cc thit b thu hnh ring bit ca mnh v lun hon thin nng cao cht lng. Mt trong nhng u im khc vi n hnh khc. Trong nhng nm gn y ca s pht trin my thu hnh mu, hng SONY s dng n hnh loi TRINITRON.

2. S ca tivi SONY KV-1485 :

S khi tivi SONY KV-1485 gm 6 phn chnh : Phn cao tn trung tn tch sng gm cc khi nh t 1 n 6. Phn ting gm cc khi nh 7.8Lp K13TVT Trang 6

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I HC DUY TN KHOA IN T VIN THNG

Phn ng hnh gm cc khi nh t 9 n 16 Phn ng b v to xung qut mnh gm cc khi nh t 17 n 22. Phn vi x l iu khin gm 23, 24. Phn ngun gm 25, 26. Phn n hnh mu a) Phn cao tn trung tn tch sng gm cc khi nh