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Main articles: Spectrogram and Spectrum analyzer. In acoustics, a spectrogram is a visual representation of the frequency spectrum of sound as a function of time or another variable. A source of sound can have many different frequencies mixed. A musical tone 's timbre is characterized by its harmonic spectrum.
The title Spectres of Marx is an allusion to Karl Marx and Friedrich Engels ' statement at the beginning of The Communist Manifesto that a "spectre [is] haunting Europe." For Derrida, the spirit of Marx is even more relevant now since the fall of the Berlin Wall in 1989 and the demise of communism. With its death the spectre of communism begins ...
Pseudospectrum. In mathematics, the pseudospectrum of an operator is a set containing the spectrum of the operator and the numbers that are "almost" eigenvalues. Knowledge of the pseudospectrum can be particularly useful for understanding non-normal operators and their eigenfunctions. The ε-pseudospectrum of a matrix A consists of all ...
Spectrum (functional analysis) In mathematics, particularly in functional analysis, the spectrum of a bounded linear operator (or, more generally, an unbounded linear operator) is a generalisation of the set of eigenvalues of a matrix. Specifically, a complex number is said to be in the spectrum of a bounded linear operator if.
Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...
A Fast Fourier Transform ( FFT) is an algorithm that computes the Discrete Fourier Transform (DFT) of a sequence, or its inverse (IDFT). Fourier analysis converts a signal from its original domain (often time or space) to a representation in the frequency domain and vice versa. The DFT is obtained by decomposing a sequence of values into ...
In particular, Spectre centers on branch prediction, which is a special case of speculative execution. Unlike the related Meltdown vulnerability disclosed at the same time, Spectre does not rely on a specific feature of a single processor's memory management and protection system, but is instead a more generalized idea.
On 18 January 2018, unwanted reboots, even for newer Intel chips, due to Meltdown and Spectre patches, were reported. Nonetheless, according to Dell, "No 'real-world' exploits of these vulnerabilities [i.e., Meltdown and Spectre] have been reported to date [26 January 2018], though researchers have produced proof-of-concepts."