In electrical engineering and control theory, a Bode plot /ˈboʊdi/ is a graph of the frequency response of a system.
A chirp is a signal in which the frequency increases (up-chirp) or decreases (down-chirp) with time.
Negative feedback occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances.
In mathematics and signal processing, an analytic signal is a complex-valued function that has no negative frequency components.
In signal processing and related disciplines, aliasing is an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled.
(For a broader coverage related to this topic, see Signal (electronics).) An analog signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.
Bandwidth (signal processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies.
A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities.
Estimation theory is a branch of statistics that deals with estimating the values of parameters based on measured empirical data that has a random component.
Sampling (signal processing)
In signal processing, sampling is the reduction of a continuous signal to a discrete signal.
Short-time Fourier transform
The short-time Fourier transform (STFT), or alternatively short-term Fourier transform, is a Fourier-related transform used to determine the sinusoidal frequency and phase content of local sections of a signal as it changes over time.
Signal (electrical engineering)
A signal as referred to in communication systems, signal processing, and electrical engineering is a function that "conveys information about the behavior or attributes of some phenomenon".
In signal processing, a window function (also known as an apodization function or tapering function) is a mathematical function that is zero-valued outside of some chosen interval.
In signal processing, the impulse response, or impulse response function (IRF), of a dynamic system is its output when presented with a brief input signal, called an impulse.
A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument.
In mathematics and in signal processing, the Hilbert transform is a linear operator that takes a function, u(t), and produces a function, H(u)(t), with the same domain.
The power spectrum of a time series describes the distribution of power into frequency components composing that signal.
In computer graphics and digital imaging, scaling refers to the resizing of a digital image.
In-phase and quadrature components
In electrical engineering, a sinusoid with angle modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle (π/2 radians).
In mathematics, a wavelet series is a representation of a square-integrable (real- or complex-valued) function by a certain orthonormal series generated by a wavelet.
Baseband is a signal that has a very narrow frequency range, i.
In probability and statistics, given two stochastic processes and , the cross-covariance is a function that gives the covariance of one process with the other at pairs of time points.