Fundamentals of Digital Television Transmission phần 2 pptx

... PERFORMANCE OBJECTIVES FOR DIGITAL TELEVISION 2 4 6 8 10 12 14 16 18 20 16 17 18 19 20 21 22 23 24 Carrier to interference ratio (dB) Carrier to noise ratio (dB) Figure 2- 5. C/I versus C/N.(FromDTV ... signals, S 3 1 ,S 3 2 , 3S 2 1 S 2 ,and3S 1 S 2 2 , have been generated. It is well known that these new signals are, among others, at frequencies 3ω 1 , 3ω 2 , 2...

Ngày tải lên: 14/08/2014, 16:20

... Ratio Mode Guard Interval Ratio 1 2 3 1 4 64 .26 128 . 52 257.04 1 8 57.83 115.67 23 1.34 1 16 54. 62 109 .24 21 8.46 1 32 53.01 106.03 21 2.06 transmission mode and the length of the guard interval. These relationships ... (Electronic) FUNDAMENTALS OF DIGITAL TELEVISION TRANSMISSION 4 DIGITAL TELEVISION TRANSMISSION STANDARDS The digital input signal to the ATS...

Ngày tải lên: 14/08/2014, 16:20

... CODING AND MODULATION FOR DIGITAL TELEVISION −0.4 −0 .2 0.0 0 .2 0.4 0.6 0.8 1.0 3.78 3.79 3.80 3.81 3. 82 Relative voltage Relative frequency (MHz) DVB-T 2k system Figure 3-8. COFDM subchannel spectra. −50.00 −45.00 −40.00 −35.00 −30.00 25 .00 20 .00 −15.00 −10.00 −5.00 0.00 3.75 ... VSB, a portion of 7 Ibid., p. 85. 58 CHANNEL CODING AND MODULATION FOR DIGITAL TELEVISION 1.00...

Ngày tải lên: 14/08/2014, 16:20

... ft) 2 57 26 9.79 0.0 32 27 551 73.34 0.117 3 63 25 5.46 0.033 28 557 72. 85 0.118 4 69 24 3.06 0.035 29 563 72. 38 0.119 5 79 22 5.64 0.038 30 569 71.91 0. 120 6 85 21 6.70 0.039 31 575 71.45 0. 120 7 ... 0. 125 13 21 3 129 .00 0.066 38 617 68.41 0. 126 14 473 80.48 0.107 39 623 68.01 0. 126 15 479 79.87 0.107 40 629 67.61 0. 127 16 485 79 .27 0.108 41 635 67 .21 0. 128 17 4...

Ngày tải lên: 14/08/2014, 16:20

... 0.069 13 21 3 20 1.83 0.070 14 473 122 .65 0.116 15 479 121 .66 0.117 16 485 120 .69 0.118 17 491 119.74 0.119 18 497 118.81 0. 120 19 503 117.89 0. 121 20 509 116.99 0. 122 21 515 116.11 0. 123 22 521 115 .25 ... 50.38 0.160 52 701 40.85 0.198 19 503 50. 02 0.161 53 707 40.63 0.199 20 509 49.66 0.1 62 54 713 40. 42 0 .20 0 21 515 49.31 0.164 55 719 40 .21 0 .20 1 22 521 48.97 0...

Ngày tải lên: 14/08/2014, 16:20

... in degrees (Lagging) 120 140 160 180 D /l=.0318 D /l=.0637 D /l=.0955 D /l=. 127 3 D /l=.15 92 D /l=.1910 D /l= .25 46 D /l= .29 65 D /l= .22 28 Figure 7 -29 . Azimuthal variation of phase for single slot ... as AF D 1 2M [e j /2 C e j 3 /2 C e j 5 /2 CÐÐÐCe j2M1 /2 C e j /2 C e j3 /2 C e j5 /2 CÐÐÐCe jN1 /2 ] 1 72 TRANSMITTING ANTENNAS FOR DIGITAL TELEVISION Although...

Ngày tải lên: 14/08/2014, 16:20

... h 2 r D R 2 e C 2R e h t C h 2 t Canceling R 2 e from both sides yields R 2 C 2R e h r C h 2 r D 2R e h t C h 2 t For the terrestrial broadcast case, 2R e h t × h 2 t × h 2 r ,sothat R ¾ p 2 ... presence of ground reflections is inversely proportional to wavelength. For larger values of kυR, ˛ 2 gr D 1 C  cos kυR 2 C  2 sin 2 kυR D 1 C 2 cos kυR C  2 co...

Ngày tải lên: 14/08/2014, 16:20

... 14 dB 26 dB 9dB 450 ns 20 0 ns 70 ns 100 ns 2 24 dB 18 dB 26 dB 17 dB 23 00 ns 1900 ns 100 ns 25 0 ns 3 24 dB 31 dB 14 dB 3900 ns 150 ns 600 ns 4 22 dB 28 dB 11 dB 820 0 ns 25 0 ns 950 ... calculated CHARLOTTE, NORTH CAROLINA 22 7 Charlotte test sites − 120 −100 −80 −60 −40 20 20 0 40 60 20 10 30 40 50 60 70 80 90 Site elevation (m) Distance (km) F 1 (m) R85 R215 −F 1 −2F...

Ngày tải lên: 14/08/2014, 16:20

... 12 Reflection: coefficient, 120 , 121 , 130, 131, 20 5, 20 8, 21 1, 21 2, 21 6, 21 7, 22 1, 22 4, 22 5, 23 8, 24 4 ground, 20 2, 20 6 21 2, 21 6, 22 3, 23 2, 23 8, 24 4 Refraction, 20 3 20 6, 22 2, 24 4 Refractivity, 20 3 Reliability, ... 17, 23 , 35, 38, 55, 74, 75, 77, 101, 103, 1 12, 114, 176, 21 1, 22 1 22 4, 22 9, 23 4, 24 3, 25 0 FET, 77, 78, 80 Field tests:...

Ngày tải lên: 14/08/2014, 16:20

... F=0 .2 3 50 c/2Ln Transmission 1.0 0.0 Figure 24 . Diagram illustrating the transmission characteristics of a fiber etalon as a function of finesse, which increases with ... are a number of configurations for these sensors and Figure 20 illustrates two of the most common ones. In the case of the end tip sensor, light propagates down the fiber to a probe of fluorescent ... l...

Ngày tải lên: 06/08/2014, 00:21