Dolby Surround At A Glance
| Decoder | Encoder | Year | Description | Channels |
|---|---|---|---|---|
| Dolby Stereo | 1975 | Cinema use with optical technology. Uses Dolby A for noise reduction. Upmix stereo to Surround 4.0 | FL FR with C and MonoSurround matrixed | |
| Dolby Surround | Dolby Surround | 1982 | First Home use. Analog. Upmix stereo to Surround 3.0 | FL FR and MonoSurround matrixed |
| Dolby Stereo SR | 1986 | Cinema use. Uses Dolby SR for noise reduction. | FL FR with C and MonoSurround matrixed | |
| Dolby Pro Logic | 1987 | Improved Dolby Surround. Upmix Stereo to Surround 4.0. | FL FR with C and MonoSurround matrixed | |
| Dolby Digital | AC3 | 1992 Film 1995 Laser Disc |
Discrete channel encoder/decoder. Pro Logic Decoder can be used for downmixed stereo inputs. | FL FR C SL SR SUB |
| Dolby Digital EX/Dolby Digital Surround EX | 1999 | non-discrete 6.1 or 7.1 (5.1 with Center Rear matrixed onto SL & SR) | FL FR C SL SR (with matrixed RearMono) SUB | |
| Dolby Pro Logic II | 2000 | Improved Dolby Pro Logic. Upmix Stereo to Surround 5.1 in either Movie, Music, or Game mode. | FL FR C SL SR SUB | |
| Dolby Pro Logic IIx | 2002 | Upmix Stereo or Surround 5.1 to 6.1 or 7.1 in either Movie, Music, or Game mode. | FL FR C SL SR SUB Left Back and Right Back | |
| Dolby Digital Plus | Dolby Media Encoder | 2005 | Lossy compression codec; 48 kHz sampling frequency, 20-bit word length; supports data rates of 32 kbit/s – 6 Mbit/s, scalable, including 768 kbit/s – 1.5 Mbit/s on high-definition optical discs, typically, and 256 kbit/s for broadcast and online. 1.0- to 7.1-channel support for current media applications; extensible to 16 channels; discrete. Backward compatibile with Dolby Digital through S/PDIF connection up to 640 kbit/s. Supports Dolby Metadata. | FL FR C SL SR SUB Left Back and Right Back |
| Dolby TrueHD | Dolby Media Encoder | 2005 | Lossless compression codec; supports 44.1 kHz to 192 kHz sampling frequency up to 24-bit word length; supports variable data rate up to 18 Mbit/s; maximum channel support is 16 channels as presently deployed. Higher bitrate than Dolby Digital Plus. Blu-ray Disc channel support up to eight channels of 96 kHz/24-bit audio; six channels (5.1) up to 192 kHz/24-bit; and two- to six-channel support up to 192 kHz/24-bit maximum bit rate up to the maximum of 18 Mbit/s. | |
| Dolby Pro Logic IIz | 2009 | Upmix Stereo or Surround 5.1/7.1 to 7.1 Height or 9.1 with the addition of front height channels. (Based on Dolby Pro Logic IIx.) | L, C, R, Ls, Rs, Lrs (Left Back), Rrs (Right Back), LFE, Lvh and Rvh |
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Famous quotes containing the words surround and/or glance:
“The light is there, and colors surround us. However, if there were no light nor colors in our own eye, we wouldn’t perceive such things outside of us.”
—Johann Wolfgang Von Goethe (1749–1832)
“Such thought such though have I that hold it tight
Till meditation master all its parts,
Nothing can stay my glance
Until that glance run in the world’s despite
To where the damned have howled away their hearts,
And where the blessed dance....”
—William Butler Yeats (1865–1939)