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Delta-sigma ( ΔΣ; or sigma-delta, ΣΔ) modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency as part of the process of delta-sigma analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). Delta-sigma modulation achieves high quality by utilizing a ...
In electronics, a digital-to-analog converter ( DAC, D/A, D2A, or D-to-A) is a system that converts a digital signal into an analog signal. An analog-to-digital converter (ADC) performs the reverse function. There are several DAC architectures; the suitability of a DAC for a particular application is determined by figures of merit including ...
A comparator to perform the function s(xi − x) by comparing the DAC's voltage with the input voltage. A register to store the output of the comparator and apply xi−1 − s(xi−1 − x)/2i. Operation of successive-approximation ADC as input voltage falls from 5 to 0 V. Iterations on the x axis. Approximation value on the y axis.
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.
A numerically controlled oscillator ( NCO) is a digital signal generator which creates a synchronous (i.e., clocked), discrete-time, discrete-valued representation of a waveform, usually sinusoidal. [1] NCOs are often used in conjunction with a digital-to-analog converter (DAC) at the output to create a direct digital synthesizer (DDS).
Personal practice model (social work) A Personal practice model (PPM) is a social work tool for understanding and linking theories to each other and to the practical tasks of social work. Mullen [1] describes the PPM as “the art and science of social work”, or more prosaically, “an explicit conceptual scheme that expresses a worker's view ...
In computer systems security, role-based access control ( RBAC) [1] [2] or role-based security [3] is an approach to restricting system access to authorized users, and to implementing mandatory access control (MAC) or discretionary access control (DAC). Role-based access control is a policy-neutral access control mechanism defined around roles ...
Interactive Forms is a mechanism to add forms to the PDF file format. PDF currently supports two different methods for integrating data and PDF forms. Both formats today coexist in the PDF specification: [37] [52] [53] [54] AcroForms (also known as Acrobat forms), introduced in the PDF 1.2 format specification and included in all later PDF ...