Blue Book (CD standard) Blue Book (CD standard) The Blue Book is a compact disc standard developed in 1995 by Philips and Sony. It defines the Enhanced Music CD format (E-CD, also known as CD-Extra, CD-Plus and CD+), which combines audio tracks and data tracks on the same disc. The format was created as a way to solve the problem of mixed mode CDs, which were not properly supported by many CD players. The standard is not freely available and must be licensed from Philips. E-CDs are created through the "stamped multisession" technology, which creates two sessions on a disc. The first session of
Philips CD-i completely arrange the whole album in their own personal way with over 15,000 points of customization. CD-i has a series of learning games ("edutainment") targeted at children from infancy to adolescence. Those intended for a younger audience included "Busytown", "The Berenstain Bears" and various others which usually had vivid cartoon-like settings accompanied by music and logic puzzles. Although extensively marketed by Philips, notably via infomercial, consumer interest in CD-i titles remained low. By 1994, sales of CD-i systems had begun to slow, and in 1998 the product line was dropped. Philips had by then already sold its gaming subsidiary, Philips