More and more video games are encoded in Dolby Surround, some even in Dolby Digital. It’s one of the technologies used by the publishers to make the games even more attractive. Audio CD’s.
Audio CD’s are also greatly used in Home Cinema systems. Virtually all Dolby Surround amplifiers possess sound effects other than Dolby or DTS. It is possible to apply DSP effects to a musical recording in order to re-create, more or less, the atmosphere of a concert hall. In this precise case, the CD doesn’t possess any particular coding, the amplifier interpolating itself the rear and central channels thanks to skilful calculations, de-phasing and filtering.
Some CD’s, notably film soundtracks, are in fact encoded in Dolby Surround. This particularity stems from the fact that it’s the same sound-track that is used in the cinema. They thus contain the original Dolby encoding.