![]() Dolby Digital, Dolby Pro Logic II, DTS, SDDS, and THX are all common 5.1 systems. ![]() It uses five full bandwidth channels and one low-frequency effects channel (the "point one"). 5.1 is the most commonly used layout in home cinema. Part 2: What is Dolby Digital 5.1?ĭolby Digital 5.1 surround sound is the common name for six channel surround sound audio systems. A search of available Blu-ray titles indicates that the current maximum is about half that amount: 6 channels at 96 kHz and 24 bit depth (which translates into a bit rate of 13.5 Mbps uncompressed, and 9 Mbps compressed). The standard supports bit depth of up to 24 bits, and data sampling rates of up to 192 kHz - for an uncompressed maximum bit rate of 63 Mbps - but for Blu-ray the current maximum is 8 audio channels at 24 bits and 96 kHz (or as an alternative, 6 channels at 24 bits and 192 kHz) for a maximum encoded bit rate of 18 Mbps. ![]() A Dolby TrueHD bitstream can accommodate up to 14 discrete sound channels, but in practice will carry either 6 (5.1) or 8 (7.1) channels. Dolby TrueHD uses the Meridian Lossless Packing (MLP) algorithm as the basis for its audio compression, which routinely achieves 2:1 compression rations.
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