Audio Visual Engineering（PPT讲稿）

Audio Visual Engineering Television-the art ofimage transmission and reception CAMERA TELEVINSION

Television - the art of image transmission and reception CAMERA TELEVISION

Audio Visual Engineering Early days, camera adopted line scanning Vidicon line scanning Electronic signals in PAL, NtsC standards TELEVINSION

Early days, camera adopted line scanning Vidicon - line scanning TELEVISION Electronic signals in PAL, NTSC standards

Audio Visual Engineering No scanning required now, standard remains the same CCD-solid state image recorain Electronic signals in PAL, NtsC standards TELEVISION

No scanning required now, standard remains the same CCD - solid state image recording TELEVISION Electronic signals in PAL, NTSC standards

Audio Visual Engineering focus coil d target scan coils ng glass cathode tin oxide 1------------------ wall heater anode video accelerating R ht supply Figure 1 g J.S. Zarach and Noel M. Morris, Television principles& practice

Figure 1 J.S. Zarach and Noel M. Morris, Television principles & practice

Audio Visual Engineering Audio requency Signal Modulator M Video y RE Signal Modulator Modulator Syn. Pulses Generator Figure 2

Figure 2 Amplitude Modulator Frequency Modulator Syn. Pulses Generator RF Modulator Audio Signal Video Signal Y MY (I.F.)

Audio Visual Engineering Resolution The smallest distance that can exist between two points Maximum number of points that can exist in an area igure 3

Figure 3 Resolution: • The smallest distance that can exist between two points • Maximum number of points that can exist in an area x

Audio Visual Engineering B/ B/W R B/W G B/W B Weighted sum Figure 4a

B/W Y B/W R B/W G B/W B + Y Weighted sum Figure 4a

Processing ofllluminance in Iv ystem Camera Y Negative AM fy-1F carrier D.C 5.5MHZ fy 5.5MHz Y LSB USB Figure 4b

Y Camera Figure 4b Negative AM MY fY - I.F. Carrier fY D.C. LSB USB fY + 5.5MHz Y 5.5MHz

Audio Visual Engineering D. C Jy f r +5. 5MHz signal LSB USB D. C fy Filter Passband D. C fy f r+5.5MHz SSB Signal gure 5a

Figure 5a f D.C. Y fY Filter D.C. Signal LSB USB f D.C. Y SSB Signal fY + 5.5MHz fY + 5.5MHz Passband

Audio visual Engineering D. C Jy f r +5. 5MHz Signal LSB USB D. C fy ilter Passband D. C fy f r+5.5MHz FSB ⅤSB USB Figure 56

Figure 5b f D.C. Y fY Filter D.C. Signal LSB USB f D.C. Y VSB Signal VSB USB fY + 5.5MHz Passband fY + 5.5MHz