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.
CNC is the acronym for Computer Numerical Control. It is an outgrowth of the older term NC, which stands for just Numerical Control. It refers to the idea of controlling machine tools programmatically via computer. With the older NC term, a computer need not be involved. The machine might be controlled using, for example, punched tape.