Autocorrelation is the cross-correlation of a signal with itself.

Autocorrelation is defined as the cross-correlation of the signal with itself over varying intervals of time or space.

* Autocorrelation detects signal waveforms.

* Autocorrelation function, mathematical tool used frequently in signal processing

Autocorrelation of the errors, which themselves are unobserved, can generally be detected because it produces autocorrelation in the observable residuals.

Autocorrelation can be visualized on a data plot when a given observation is more likely to lie above a fitted line if adjacent observations also lie above the fitted regression line.

Autocorrelation may be the result of misspecification such as choosing the wrong functional form.

Autocorrelation violates the ordinary least squares ( OLS ) assumption that the error terms are uncorrelated.

* Autocorrelation is used to analyze Dynamic light scattering data, which notably enables to determine the particle size distributions of nanometer-sized particles or micelles suspended in a fluid.

* Autocorrelation in space rather than time, via the Patterson function, is used by X-ray diffractionists to help recover the " Fourier phase information " on atom positions not available through diffraction alone.

* Autocorrelation articles in Comp. DSP ( DSP usenet group ).

Autocorrelation is common in time series data where a data series may experience " inertia.

Autocorrelation methods need at least two pitch periods to detect pitch.

* Sieves for Low Autocorrelation Binary Sequences, IEEE Trans.

Autocorrelation analysis helps to identify the correct phase of the fitted model while the successive differencing transforms the stochastic drift component into white noise.

But during nighttime hours the skywave radiations are reflected from the ionosphere, thereby creating the possibility of one station's rendering service, via skywave, at a much greater distance than it can through its groundwave signal, and at the same time vastly complicating the interference problem because of the still greater distance over which these skywave signals may cause interference to the signals of stations on the same and closely adjacent frequencies.

The design of a mechanical interlocking frame is much like a mechanical puzzle, but once understood, the principles can be applied to any track and signal arrangement.

This instrument provides an electrical signal proportional to the angular deviations of the platform and can be used to automatically hold the platform on true heading.

Since altruism takes away resources from the altruist it can be a " honest signal " of resource availability and the abilities needed to gather resources.

It differs from a digital signal, in which a continuous quantity is represented by a discrete function which can only take on one of a finite number of values.

In practice an analog signal is subject to electronic noise and distortion introduced by communication channels and signal processing operations, which can progressively degrade the signal-to-noise ratio.

Converting an analog signal to digital form introduces a constant low-level noise called quantization noise into the signal which determines the noise floor, but once in digital form the signal can in general be processed or transmitted without introducing additional noise or distortion.

Even if the resolution of an analog signal is higher than a comparable digital signal, the difference can be overshadowed by the noise in the signal.

For reception, a local oscillator will typically restore the suppressed carrier so the signal can be demodulated with a product detector.

The Amiga chipset can genlock: adjust its own screen refresh timing to match an NTSC or PAL video signal.

Raymond Williams argues that there is no unique and or individual aesthetic object which can be extrapolated from the art world, but that there is a continuum of cultural forms and experience of which ordinary speech and experiences may signal as art.

Although such a conversion can be prone to loss, most modern audio systems use this approach as the techniques of digital signal processing are much more powerful and efficient than analog domain signal processing.

The analog television signal contains timing and synchronization information so that the receiver can reconstruct a two-dimensional moving image from a one-dimensional time-varying signal.

This noise can be avoided by modulation of the signal at a higher frequency, for example through the use of a lock-in amplifier.

In telecommunications, asynchronous communication is transmission of data without the use of an external clock signal, where data can be transmitted intermittently rather than in a steady stream .< ref >

* In signal processing, autocorrelation can give information about repeating events like musical beats ( for example, to determine tempo ) or pulsar frequencies, though it cannot tell the position in time of the beat.

The fact that in equivalent baseband models of communication systems, the signal spectrum consists of both negative and positive frequencies, can lead to confusion about bandwidth, since they are sometimes referred to only by the positive half, and one will occasionally see expressions such as, where is the total bandwidth ( i. e. the maximum passband bandwidth of the carrier-modulated RF signal and the minimum passband bandwidth of the physical passband channel ), and is the positive bandwidth ( the baseband bandwidth of the equivalent channel model ).

but let the twenty-five thousand and first butchery be the signal for the arrest of the 50 state highway commissioners.

The extent of such interference -- which may be so slight as to be undetectable at any point where either of the stations renders a usable signal, or may be so great as to virtually destroy the service areas of both stations -- depends on many factors, among the principal ones being the distance between the stations, their respective radiated power, and, of particular significance here, the time of day.

Interlocking signals are normally at stop or `` red '' position, and a lever must be pulled to `` clear '' the signal.

A signal cannot be cleared until all the related turnouts are properly thrown and locked.

If the points aren't thrown all the way, the Turnout cannot be locked, and in turn, the signal cannot be cleared.

As soon as that one man is appointed by himself or the others or by a signal from Spencer, we are going to be rushed.

Due to the averaging it is far more stable than any clock would be alone ( see signal averaging for a discussion ).

It may also be a signal of interactive and cooperative intentions since those not interacting further in the future gain nothing from the costly signaling.

When looking for a long-term partner more conventional altruism may be preferred which may indicate that he is also willing to share resources with her and her children while when looking for a short-term partner heroic risk-taking, which may be costly signal showing good genes, may be more preferable.

In an electrical signal, the voltage, current, or frequency of the signal may be varied to represent the information.

Any information may be conveyed by an analog signal ; often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure.

An analog signal may be processed directly by analog components, though some processes aren't available except in digital form.