Dolby Digital is the digital audio technique developed by Dolby Laboratories. It is the audio compression technology aims to give crystal clear sound and is used in several HDTV broadcast, DVDs, films, Blu-ray Discs and game consoles. Dolby Digital was first used for 35mm film prints in cinema hall. It was developed in 1971 and later on launched other versions such as Dolby Digital EX, Dolby Digital Live, Dolby Digital Plus, Dolby Digital Surround EX, Dolby Digital Recording, Dolby Digital Cinema, Dolby Digital Stereo Creator and Dolby Digital 5.1 Creator. It brought revolution in audio world. The postal and official address, email address and phone number (helpline) of Dolby service center is given above. The helpline of Dolby service center may or may not be toll free.