It has been suggested that this article or section be merged with Digital television. (Discuss)

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

• HDTV
• ATSC Standards
• DVB-T
• ISDB

v • d • e Digital television in North America Digital television Terrestrial Digital broadcasting ATSC tuners · Digital subchannels · Virtual channels · Distributed transmission system · Datacasting (Guide Plus · National Datacast · UpdateLogic) · Metropolitan Television Alliance · Grand Alliance Digital switchover All-Channel Receiver Act · SAFER Act · Digital channel election · Set-top boxes · Digital television adapter · U.S. Converter Box Coupon Program (boxes, legislation) · Analog passthrough · DVD recorders · Digital video recorders Digital standards ATSC Standards (ATSC · ATSC-M/H · 8VSB · A-VSB · E-VSB · PSIP · PMCP · full list) · Standard-definition TV (480i · 576i) · Enhanced-definition TV (480p · 576p) · High-definition TV (720p · 1080i · 1080p) · Serial digital interface · Smart antennas (CEA-909) Digital networks see Template:American broadcast television National deployment List by country · Canada  · Mexico  · United Kingdom  · United States (HDTV · transition · wireless spectrum auction) Cable Digital cable Digital-cable-ready TV (QAM tuners) · Interactive-digital-cable-ready TV (OpenCable Application Platform · Advanced Common Application Platform) · Must-carry · Tru2way Subscription TV Encryption · CableCARD · Downloadable Conditional Access System Satellite TV DVB-S (Dish Network · GlobeCast World TV · Free-to-air receiver · Bell TV) · DigiCipher 2 (4DTV · Shaw Direct) · Digital Satellite Service/DVB-S2 (DirecTV) Technical issues 14:9 · Active Format Description · Broadcast flag · Channel protection ratios · HDTV blur · Hierarchical modulation · Pirate decryption · Standards conversion · Video on demand

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