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For a start, consistent sound levels between stations. I do realize that compression and shaping can modify the apparent loudness, but I don't need to drastically change the volume settings when changing stations, unlike my cable TV channels. Surely with all the extensive and varied standards for video encoding that all result in a watchable image, there still seems to be a dearth of standards to properly manage the sound levels.
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There are actually CRTC rules about this. Not that they're very closely followed.
CRTC Commercial Loudness Rules
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The rules state that broadcasters and television service providers "must ensure that TV commercials are broadcast at a similar volume to programs". This does not mean the audio level is, or must be, consistent between channels or even between programs.
Contrary to belief, there is a fair amount of effort placed on TV audio levels. In many cases, audio levels are normalized to a common level, when ingested into the server, prior to broadcast. But it ain't perfect.
Television is a challenging platform to maintain the perception of consistent audio levels across a variety of programming content (theatrical movies, news, live sports, sitcoms, talk shows, games shows, awards shows, etc) especially when a given commercial might air within any of them. In addition, there is a multitude of audio formats (mono, stereo, and 5.1) and personal settings on home "TV's".
Radio stations tend to have a common type of programming (classical, talk, rock, news, etc) across their program day, in a single audio format (stereo) which can make it a lot easier to maintain the perception of consistent audio loudness.