Dolby System
1976–1992
Version with registered symbol
Dolby B NR
1979–present
Alternate vertical version. Mostly used on Paramount VHS releases of TV shows.
2007–present
Dolby B NR HX Pro
1983–present
2007–present
Dolby B-C NR
1979–2007
Dolby S NR
1984–2007
Dolby S NR HX Pro
1986–1991
Dolby B-C-S NR
1991–1995
Dolby B-C-S NR HX Pro
1995–1996
Dolby SR
1996–2007
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