Editing Digital television (section)

=== Protection parameters ===
Digital television signals must not interfere with each other and they must also coexist with analog television until it is phased out. The following table gives allowable signal-to-noise and signal-to-interference ratios for various interference scenarios. This table is a crucial regulatory tool for controlling the placement and power levels of stations. Digital TV is more tolerant of interference than analog TV.<ref>{{Cite web|title=Frequently Asked Questions -- What Is Digital TV?|url=https://abcnews.go.com/Technology/story?id=97270&page=1|access-date=2020-09-30|website=ABC News|language=en}}</ref>

{{unreferenced section|date=May 2023}}
{| class="wikitable"
|-
! System Parameters<br /><small>(protection ratios)</small>
! Canada
! US
! EBU<br /><small>ITU-mode M3</small>
! Japan & Brazil{{efn-ua|ISDB-T (6&nbsp;MHz, 64QAM, R{{=}}2/3), Analog TV (M/NTSC).}}
|-
! C/N for AWGN Channel
| +19.5&nbsp;dB<br />(16.5&nbsp;dB{{efn-ua|name=protection_parameters_table_note_a|The Canadian parameter, C/(N+I) of noise plus co-channel DTV interface should be 16.5&nbsp;dB.}})
| +15.19&nbsp;dB
| +19.3&nbsp;dB
| +19.2&nbsp;dB
|-
! Co-Channel DTV into Analog TV
| +33.8&nbsp;dB
| +34.44&nbsp;dB
| +34 ≈37&nbsp;dB
| +38&nbsp;dB
|-
! Co-Channel Analog TV into DTV
| +7.2&nbsp;dB
| +1.81&nbsp;dB
| +4&nbsp;dB
| +4&nbsp;dB
|-
! Co-Channel DTV into DTV
| +19.5&nbsp;dB<br />(16.5&nbsp;dB{{efn-ua|name=protection_parameters_table_note_a}})
| +15.27&nbsp;dB
| +19&nbsp;dB
| +19&nbsp;dB
|-
! Lower Adjacent Channel DTV into Analog TV
| −16&nbsp;dB
| −17.43&nbsp;dB
| −5 ~ −11&nbsp;dB{{efn-ua|name=protection_parameters_table_note_c|Depending on analog TV systems used.}}
| −6&nbsp;dB
|-
! Upper Adjacent Channel DTV into Analog TV
| −12&nbsp;dB
| −11.95&nbsp;dB
| −1 ~ −10{{efn-ua|name=protection_parameters_table_note_c}}
| −5&nbsp;dB
|-
! Lower Adjacent Channel Analog TV into DTV
| −48&nbsp;dB
| −47.33&nbsp;dB
| −34 ~ −37&nbsp;dB{{efn-ua|name=protection_parameters_table_note_c}}
| −35&nbsp;dB
|-
! Upper Adjacent Channel Analog TV into DTV
| −49&nbsp;dB
| −48.71&nbsp;dB
| −38 ~ −36&nbsp;dB{{efn-ua|name=protection_parameters_table_note_c}}
| −37&nbsp;dB
|-
! Lower Adjacent Channel DTV into DTV
| −27&nbsp;dB
| −28&nbsp;dB
| −30&nbsp;dB
| −28&nbsp;dB
|-
! Upper Adjacent Channel DTV into DTV
| −27&nbsp;dB
| −26&nbsp;dB
| −30&nbsp;dB
| −29&nbsp;dB
|}

{{Notelist-ua}}