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.
110 DDC CONTROL SYSTEM Å I.O.M. Chapter 8 ENVIRO-TEC DDC CONTROL SYSTEMSTATIC PRESSURE, AIRFLOW and TEMPERATURECALIBRATION PROCEDURES As stated previously, all of the analog input data utilized by the Enviro-Tec DDC control system can be calibrated bysoftware, if required.