ATSC Broadcast

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ATSC Broadcast
ATSCthmb.jpg
Frequencies 54 MHzMegaHertz (MHz) 10^6 Hz54,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
54,000 kHzKiloHertz (kHz) 10^3 Hz
,700 MHzMegaHertz (MHz) 10^6 Hz700,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
700,000 kHzKiloHertz (kHz) 10^3 Hz
54,000 kHzKiloHertz (kHz) 10^3 Hz
54 MHzMegaHertz (MHz) 10^6 Hz
700,000 kHzKiloHertz (kHz) 10^3 Hz
700 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 54 MHzMegaHertz (MHz) 10^6 Hz54,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
54,000 kHzKiloHertz (kHz) 10^3 Hz
- 700 MHzMegaHertz (MHz) 10^6 Hz700,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
700,000 kHzKiloHertz (kHz) 10^3 Hz
Mode RAW
Modulation 8VSB
ACFAutoCorrelation Function
Bandwidth 6 MHzMegaHertz (MHz) 10^6 Hz6,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
6,000 kHzKiloHertz (kHz) 10^3 Hz
6,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
6,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
Location North America
Short Description Advanced Television Systems Committee Television. 8VSB Modulation
I/Q Raw Recording
Audio Sample

Description[edit]

Advanced Television Systems Committee Television. 8VSB Modulation. 8VSB Modulation is a special kind of PAMPulse Amplitude Modulation Modulation.

Each channel has a single carrier signal on the left of the signal.

8VSB[edit]

Vestigal Side Band[edit]

VSB.jpg

8-Amplitude Keying[edit]

8VSB uses digital amplitude modulation with 8 distinct amplitude levels representing 3 digital bits. If this were ordinary double-sideband AMAmplitude Modulation, these levels would appear as 8 dots along the I (real) axis. However, a Q channel component is created by the vestigial sideband (VSBVestigial Sideband Modulation) filtering that removes most of the lower sideband. The Q channel component is removed in demodulation, i.e., the lower sideband is reconstructed in the receiver just as it was in analog TV.

In contrast, 64-QAMQuadrature Amplitude Modulation uses eight distinct I and eight distinct Q amplitudes to encode one of 64 combinations representing 6 bits, i.e., twice as many per symbol as 8VSB. To do this it must transmit two complete sidebands (which are not mirror images of each other).

Ss (2015-08-05 at 12.47.51).png

Frequencies[edit]

Table is taken from Wikipedia ATSC article.

In 2009, all US TV stations transitioned to the ATSC 8VSB (digital) signal described above. The ATSC pilot (carrier) signal is 309 440.559 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). ±1 kHzKiloHertz (kHz) 10^3 Hz above the lower edge of the channel. In ATSC the audio and video are multiplexed onto a single digital signal and the video and audio carrier frequencies found in earlier NTSC (analog) TV channel tables are no longer applicable.


VHFVery High Frequency (30-300 MHz) low-band
(frequencies in MHzMegaHertz (MHz) 10^6 Hz)
 Channel   Lower edge   ATSC pilot   Upper edge 
2 54 54.31 60
3 60 60.31 66
4 66 66.31 72
(72-76 MHzMegaHertz (MHz) 10^6 Hz assigned to other services)
5 76 76.31 82
6 82 82.31 88

VHFVery High Frequency (30-300 MHz) high-band

(frequencies in MHzMegaHertz (MHz) 10^6 Hz)

 Channel   Lower edge    ATSC pilot   Upper edge 
7 174 174.31 180
8 180 180.31 186
9 186 186.31 192
10 192 192.31 198
11 198 198.31 204
12 204 204.31 210
13 210 210.31 216

UHFUltra High Frequency (300-3000 MHz) band

(frequencies in MHzMegaHertz (MHz) 10^6 Hz)

 Channel   Lower edge   ATSC pilot   Upper edge 
14 470 470.31 476
15 476 476.31 482
16 482 482.31 488
17 488 488.31 494
18 494 494.31 500
19 500 500.31 506
20 506 506.31 512
21 512 512.31 518
22 518 518.31 524
23 524 524.31 530
24 530 530.31 536
25 536 536.31 542
26 542 542.31 548
27 548 548.31 554
28 554 554.31 560
29 560 560.31 566
30 566 566.31 572
31 572 572.31 578
32 578 578.31 584
33 584 584.31 590
34 590 590.31 596
35 596 596.31 602
36 602 602.31 608
37 608 608.31 614
38 614 614.31 620
39 620 620.31 626
40 626 626.31 632
41 632 632.31 638
42 638 638.31 644
43 644 644.31 650
44 650 650.31 656
45 656 656.31 662
46 662 662.31 668
47 668 668.31 674
48 674 674.31 680
49 680 680.31 686
50 686 686.31 692
51 692 692.31 698

Channel 37 is reserved for the radio astronomy service and no new broadcast stations are assigned to channel 51 to minimize interference to new digital services operating in former UHFUltra High Frequency (300-3000 MHz) TV channel 52.

Decoding Tutorials[edit]

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]