DTV channel protection ratios
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Terrestrial digital television will co-exist with analog television for many years. The issue of electromagnetic compatibility between the two systems still looms.
[edit] ATSC-EBU table of acceptable protection ratios
| System Parameters (protection ratios) |
Canada [13] | USA [5] | EBU [9, 12] ITU-mode M3 |
Japan [36, 37] 2 |
| C/N for AWGN Channel | +19.5 dB (16.5 dB1 ) |
+15.19 dB | +19.3 dB | +19.2 dB |
| Co-Channel DTV into Analog TV | +33.8 dB | +34.44 dB | +34 ~ 37 dB | +38 dB |
| Co-Channel Analog TV into DTV | +7.2 dB | +1.81 dB | +4 dB | +4 dB |
| Co-Channel DTV into DTV | +19.5 dB (16.5 dB1 ) |
+15.27 dB | +19 dB | +19 dB |
| Lower Adjacent Channel DTV into Analog TV | -16 dB | -17.43 dB | -5 ~ -11 dB3 | -6 dB |
| Upper Adjacent Channel DTV into Analog TV | -12 dB | -11.95 dB | -1 ~ -103 | -5 dB |
| Lower Adjacent Channel Analog TV into DTV | -48 dB | -47.33 dB | -34 ~ -37 dB3 | -35 dB |
| Upper Adjacent Channel Analog TV into DTV | -49 dB | -48.71 dB | -38 ~ -36 dB3 | -37 dB |
| Lower Adjacent Channel DTV into DTV | -27 dB | -28 dB | -30 dB | -28 dB |
| Upper Adjacent Channel DTV into DTV | -27 dB | -26 dB | -30 dB | -29 dB |
Note 1: The Canadian parameter, C/(N+I) of noise plus co-channel DTV interface should be 16.5 dB.
Note 2: ISDB-T (6MHz, 64QAM, R=2/3), Analog TV (M/NTSC).
Note 3: Depending on analog TV systems used.
This table is based upon parameters found via research funded by the United States Federal Communications Commission (FCC), and the Canadian Radio-television and Telecommunications Commission (CRTC).
[edit] See also
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