| 释义 |
A/D converter
A/D converter A5082700 (ā′dē′)n. See analog-to-digital converter.A/D converter
A/D converterAnalog to Digital ConverterA/D converter(Analog/Digital converter) A device that converts continuously varying analog signals from instruments and sensors that monitor conditions, such as sound, movement and temperature into binary code for the computer. The A/D converter may be contained on a single chip or can be one circuit within a chip. See codec and sampling.
A/D Converters Are Everywhere
Every digital desk phone and cellphone has an A/D converter that turns electronic sound waves into digital PCM code. Every digital camera, camcorder and scanner uses A/D converters to transform the variable charges captured in CCD and CMOS chips into the binary pixel data that make up a digital image. See modem, DSP, CCD sensor, CMOS sensor, PCM and codec. Contrast with D/A converter.
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| Widely used in consumer electronics, as well as industrial machinery, the A/D converter can be a chip or a circuit within a chip. |
See CCD
SeeCCD catheter." href="javascript:eml2('davisTab', 'd15a.jpg')"> VENOUS ACCESS DEVICES: A. An over-the-needle catheter; B. An inside-the-needle catheter. VENOUS ACCESS DEVICES: A. An over-the-needle catheter; B. An inside-the-needle catheter.venous access deviceA specially designed catheter for gaining and maintaining access to the venous system. This device provides access for patients who require intravenous fluids or medications for several days or more, e.g., those having a bone marrow transplant or who are receiving long-term total parenteral nutrition. See: venous port See: illustrationventricular assist device Abbreviation: VAD
A pump to treat heart failure. It helps the ventricles to contract and move blood to the lungs and/or the aorta. See: left ventricular assist device
charge-coupled device Abbreviation: CCD
A device used in video and digital imaging (such as in CT scanning) that creates electronic images from light. See also: deviceFinancialSeefax/modemThesaurusSeeanalog-to-digital converter |