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2. Low-pass filter - Wikipedia

   en.wikipedia.org/wiki/Low-pass_filter

   The Whittaker–Shannon interpolation formula describes how to use a perfect low-pass filter to reconstruct a continuous signal from a sampled digital signal. Real digital-to-analog converters uses real filter approximations. Time response. The time response of a low-pass filter is found by solving the response to the simple low-pass RC filter.

3. Reconstruction filter - Wikipedia

   en.wikipedia.org/wiki/Reconstruction_filter

   Reconstruction filter. In a mixed-signal system ( analog and digital ), a reconstruction filter, sometimes called an anti-imaging filter, is used to construct a smooth analog signal from a digital input, as in the case of a digital to analog converter ( DAC) or other sampled data output device.

4. Sample and hold - Wikipedia

   en.wikipedia.org/wiki/Sample_and_hold

   Sample and hold circuits and related peak detectors are the elementary analog memory devices. They are typically used in analog-to-digital converters to eliminate variations in input signal that can corrupt the conversion process. They are also used in electronic music, for instance to impart a random quality to successively-played notes.

5. Digital down converter - Wikipedia

   en.wikipedia.org/wiki/Digital_down_converter

   In digital signal processing, a digital down-converter ( DDC) converts a digitized, band-limited signal to a lower frequency signal at a lower sampling rate in order to simplify the subsequent radio stages. The process can preserve all the information in the frequency band of interest of the original signal. The input and output signals can be ...

6. Quantization (signal processing) - Wikipedia

   en.wikipedia.org/wiki/Quantization_(signal...

   Quantization, in mathematics and digital signal processing, is the process of mapping input values from a large set (often a continuous set) to output values in a (countable) smaller set, often with a finite number of elements. Rounding and truncation are typical examples of quantization processes.

7. Sensor node - Wikipedia

   en.wikipedia.org/wiki/Sensor_node

   The continual analog signal produced by the sensors is digitized by an analog-to-digital converter and sent to controllers for further processing. Some sensors contain the necessary electronics to convert the raw signals into readings which can be retrieved via a digital link (e.g. I2C, SPI) and many convert to units such as °C.