analog-to-digital conversion

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Related to analog-to-digital conversion: A/D converter, A/D conversion

analog-to-digital or A/D conversion,

the process of changing continuously varying data, such as voltage, current, or shaft rotation, into discrete digital quantities that represent the magnitude of the data compared to a standard or reference at the moment the conversion is made. There are two types of converters: electromechanical—also called shaft- or position-to-digital—and electronic. The most common use is to change analog signals into a form that can be manipulated by a digital computercomputer,
device capable of performing a series of arithmetic or logical operations. A computer is distinguished from a calculating machine, such as an electronic calculator, by being able to store a computer program (so that it can repeat its operations and make logical
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, as in data communications; a modemmodem
[modulator/demodulator], an external device or internal electronic circuitry used to transmit and receive digital data over a communications line normally used for analog signals.
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, or data set, is a device that converts the digital signals produced by computers and terminals into analog signals that telephone circuits are designed to carry and then back to digital signals at the other end of the communication link. Similarly, in digital sound recording, audio signals are transformed into digital data, which are then recorded on a magnetic or optical disk or tape; the digitized data on the recording medium then must be changed back into the analog sound signals that can be used by a stereophonic sound system. See also digital-to-analog conversiondigital-to-analog or D/A conversion,
the process of changing discrete digital data into a continuously varying signal in relation to a standard or reference.
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See M. J. Demler, High-Speed Analog-to-Digital Conversion (1991); K. M. Daugherty, Analog-to-Digital Conversion: A Practical Approach (1995).

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A/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.

A/D Converter
Widely used in consumer electronics, as well as industrial machinery, the A/D converter can be a chip or a circuit within a chip.
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References in periodicals archive ?
The analog-to-digital conversion is carried out by measuring the time-constant of the RC circuit.
Additionally, 1024 levels of gray are available in analog-to-digital conversion. Contrast is enhanced by varying these levels as desired.[1]
The limit is imposed by the analog-to-digital conversion required to transmit data over the local loop.
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The other features include digital programmable logic, high-performance analog-to-digital conversion (ADC), opamps with comparator mode, and standard communication and timing peripherals.
The earliest DMMs had to find solutions to issues such as range and polarity switching, analog-to-digital conversion, and even the display of the measured value.
Sensing applications typically require several analog and digital blocks, such as excitation circuits, an analog front end consisting of signal-conditioning and filtering circuitry, analog-to-digital conversion, digital signal processing and communication blocks.
Critics, including congressmen from across the political spectrum, also accuse Azteca of breaking another law that provides guidelines to the analog-to-digital conversion, due to be completed in 2022.
All electronics for analog signal conditioning, analog-to-digital conversion, digital signal processing, and RS485 network communications are incorporated into the module enclosure.
The other contributors amplify such basic and advanced topics as modulation and signal detection, pulse- and multi carrier based systems, precision localization in impulse radio technology, Gaussian statistics applied to indoor noise analysis, and analog-to-digital conversion.
Using advanced analog-to-digital conversion hardware, the "D" series captures the surge test waveform, displays it, and allows a print-out to made, if required.
Preparation of the sensor's output to interface with the control system is explained and methods for signal amplification, calibration, compensation and analog-to-digital conversion are detailed.