Analog to Digital Converter (ADC)
•Analog quantity may be voltage, temperature, sound, speed, audio etc. it is information or signal.
•Analog quantity may be voltage, temperature, sound, speed, audio etc. it is information or signal.
•Digital means it is in binary form (1 and 0) 1 means on and 0 means off.
•Converter is a device.
•Analog to
Digital Converter (ADC) is
use for converting analog signal into digital form.
•Most
of the data is in analog form but most data processing is done using digital computers.
•So for processing and/or modifying
signals we need to convert
it in digital form.
•Pulse
Code Modulation (PCM) technique method is use to
digitally represent discrete analog signal.
•PCM consists of three stages one is sampling second is quantization and third is binary encoding.
•The sampling measures the amplitude of the signal at different
interval.
•Quantization is the process of converting the sampled continuous
large set of input value to small countable discrete value.
•Binary
Encoding is assigning of binary equivalent to each state
of output.
•There
are four
types of ADC one is counter type second is integrating or dual scope third is parallel or flash fourth is successive approximation.
•Examples
of Analog
to Digital (A to D) converters are microphone (converts analog audio signal to
digital form), Voltmeter (converts analog voltage signal into digital), Scanner and camera (converts analog image into digital form), digital speedometer (converts analog speed into digital form) etc.
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