Signal processing

process control theorem

any technique to improve resolution of an imaging system beyond conventional limits

thumb|right|255px|Fig 1: The top 2 graphs depict Fourier transforms of 2 different functions that produce the same results when sampled at a particular rate. The baseband function is sampled faster than its Nyquist rate, and the bandpass function is undersampled, effectively converting it to baseband. The lower graphs indicate how identical spectral results are created by the aliases of the sampling process. thumb|right|255px|Plot of sample rates (y axis) versus the upper edge frequency (x axis) for a band of width 1; grays areas are combinations that are "allowed" in the sense that no two fre

signal (re-)construction algorithm

thumb|Comparison of two imaging modalities, optical tomography (A, C) and [[computed tomography (B, D), as applied to a Lego minifigure]]

effect of filters or amplifiers on signals' phases as function of frequency

idealized filter that removes all signal frequency components above a given frequency

response that characterizes how an ear receives a sound from a point in space

plot

representation of sounds used in applications such as automatic speech recognition

high-quality audio telephony

A generalization of a basis to sets of possibly linearly dependent vectors which also satisfy the frame condition

particular representation of a signal

delays experienced through a linear time-invariant system

mathematical technique for manipulating signals etc.

system with a countable number of states

signal processing concept

estimate object properties from a finite number of projections

point where a function crosses an axis and changes sign

used in signal processing, which is the time-frequency variant of the Wigner quasiprobability distribution

Parameter of electronic amplifiers

In digital signal processing, upsampling, expansion, and interpolation are terms associated with the process of resampling in a multi-rate digital signal processing system. Upsampling can be synonymous with expansion, or it can describe an entire process of expansion and filtering (interpolation). When upsampling is performed on a sequence of samples of a signal or other continuous function, it produces an approximation of the sequence that would have been obtained by sampling the signal at a higher rate (or density, as in the case of a photograph). For example, if compact disc audio at 44,100

particular type of stochastic processes

integrated device containing configurable analog blocks and interconnects between these blocks

thumb|right|280px|Bit-error rate (BER) vs E_b/N_0 curves for different [[digital modulation methods is a common application example of E_b/N_0. Here an AWGN channel is assumed.]]

method for the separation of a set of signals in math and statistics

right|170px|thumb|Nullator electronic symbol In electronics, a nullator is a theoretical linear, time-invariant one-port defined as having zero current and voltage across its terminals. Nullators are strange in the sense that they simultaneously have properties of both a short (zero voltage) and an open circuit (zero current). They are neither current nor voltage sources, yet both at the same time.

right|170px|thumb|Norator electronic symbol In electronics, a norator is a theoretical linear, time-invariant one-port which can have an arbitrary current and voltage between its terminals. A norator represents a controlled voltage or current source with infinite gain.

signal processing system

function of propagation delay and Doppler frequency, representing the distortion of a returned pulse due to the receiver matched filter of the return from a moving target

device in signal processing

astrophysical technique

Method in signal processing

application of a mathematical formula

small plastic screan with 2 atchments one with HF/el . C 2008 Apple

oscilloscope that stores and analyses signals digitally

frequency-domain analysis method

using software instead of dedicated hardware to process and make use of signals

right|200px|thumb|Nullor electronic symbol (balanced version) right|200px|thumb|Nullor electronic symbol (unbalanced version)

techniques and methods in signal processing

Lossy audio coding technique

Signal decomposition where wavelet packet decomposition (sampled)

sum of a function's values every _P_ offsets

signal analysis tool

mathematical model of the practical reconstruction of sampled signals that could be done by a conventional digital-to-analog converter (DAC) and an analog circuit called an integrator

exact discrete Radon transform

Method in signal processing

parameter-free superresolution algorithm for the linear inverse problem in spectral estimation, direction-of-arrival estimation and tomographic reconstruction with applications in signal processing, medical imaging and remote sensing

group of sensors, usually deployed in a geometric pattern, used to increase gain or dimensionality over a single sensor

radio wave analysis method

statistical distribution

signal-processing procedure

mathematical method to estimate the components of a signal

type of artifact in signal-processing that appears near sharp transitions

In probability and statistics, given two stochastic processes \left\{X_t\right\} and \left\{Y_t\right\}, the cross-covariance is a function that gives the covariance of one process with the other at pairs of time points. With the usual notation \operatorname E for the expectation operator, if the processes have the mean functions \mu_X(t) = \operatorname \operatorname E[X_t] and \mu_Y(t) = \operatorname E[Y_t], then the cross-covariance is given by

vocoder algorithm

thumbnail|Airy disk