标题: Tracking and Remembering Devices using Amazon Cognito Your User Pools [打印本页] 作者: MattieKgz 时间: 5 天前 标题: Tracking and Remembering Devices using Amazon Cognito Your User Pools You hit the button to open the tray in your DVD participant, nestle your disc into place, let the tray glide into the field and -- growth -- "Mary Poppins" begins. But what manner of digital magic is employed to make Mary and Bert and the Banks children sing and play in your Tv display screen? After all, it's not magic at all, but it is a feat of engineering and expertise. A DVD participant could be very just like a CD participant, with a laser assembly that shines the laser beam onto the surface of the disc to learn the pattern of bumps (see How CDs Work for particulars). The DVD participant decodes the MPEG-2 encoded movie, turning it into a regular composite video sign (see How Television Works for details). The player additionally decodes the audio stream and sends it to a Dolby decoder, the place it is amplified and sent to the speakers.