Some hearing milestones your child should reach in the first year of life: 1  Most newborn infants startle or jump to sudden loud noises. 2  By 3 months, a baby usually recognizes a parent's voice. 3  By 6 months, a baby can usually turn his or her eyes or head toward a sound.
(December 2008). Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies.
Controller Pilot Data Link Communications (CPDLC) is a means of communication between controller and pilot, using data link for ATC communications. (ICAO Doc 4444: PANS-ATM) Description. CPDLC is a two-way data-link system by which controllers can transmit non urgent 'strategic messages to an aircraft as an alternative to voice communications.