| 释义 |
white noise
white noisen. Acoustical or electrical noise of which the intensity is the same at all frequencies within a given band over time.
[From the analogy with white light.]white noise n (General Physics) a. sound or electrical noise that has a relatively wide continuous range of frequencies of uniform intensityb. noise containing all frequencies rising in level by six decibels every octave white′ noise′
n. random noise with a uniform frequency spectrum over a wide range of frequencies. [1965–70] Thesaurus| Noun | 1. | white noise - a noise produced by a stimulus containing all of the audible frequencies of vibration; "white noise is a good masking agent"interference, noise, disturbance - electrical or acoustic activity that can disturb communication |
Translationswhite noise
white noisea. sound or electrical noise that has a relatively wide continuous range of frequencies of uniform intensity b. noise containing all frequencies rising in level by six decibels every octave White Noise a generalized stochastic process of the type 
where ϕ(t) is a finite function and X(t) is a stochastic process with zero mathematical expectation and with the correlation function B(s, t) = δ(s – t). The generalized function δ is determined by the formula 
for any finite functions ϕk(t), where k = 1,2. This process is a stationary stochastic process with a spectral density f(λ) = ½π, –∞ F(Δ) = ʃΔf(λ)dλ White noise is used as a mathematical model in theoretical studies. Noise of any nature that has a uniform spectrum in a finite band of frequencies, such as the noise of electronic tubes, atmospheric noise, and oceanic noise, can be approximated quite well by the white-noise process. REFERENCEProkhorov, Iu. V., and Iu. A. Rozanov. Teoriia veroiatnostei, 2nd ed. Moscow, 1973.white noise[′wīt ‚nȯiz] (physics) Random noise that has a constant energy per unit bandwidth at every frequency in the range of interest. white noiseNoise having a flat spectrum over the frequency range of interest; the acoustic power per unit-frequency is substantially independent of frequency.white noiseWhite, random or background noise caused, in aircraft propulsion, by the reaction of each blade to the flow of air over its surface. The noise is from the eddy shedding in the blade's wake, reacting back on the blade, and carrying random fluctuations over the blade surface. White noise may also be caused by turbulence in the airstream, and it can be found within electronic circuitry.white noiseA random signal of every frequency in the audio spectrum, all of which have an average uniform power level. White noise is generated for a variety of purposes, including masking sounds in a room, testing loudspeakers for distortion and coloration and to provide input to a synthesizer, which uses filters to derive all of its sounds. Contrast with pink noise and Gaussian noise.white noise
white noisea complex, rushing sound consisting of many frequencies over a wide band.A sound with equal energy at all frequencies, which can be eliminated by raising the ‘cut-off’ of the detection devicewhite noise A sound with equal energy at all frequencies, which can be eliminated by raising the 'cut-off' of the detection device. Cf Chaos. white noise (wīt noyz) A complex sound consisting of many frequencies over a wide band of frequencies; often used for masking of hearing in the nontest ear in the measurement of hearing. White Noise
White NoiseThe audio equivalent of Brownian motion. Sounds that are unrelated and sound like a hiss. The video equivalent of white noise is "snow" in television reception.Random Walk TheoryAn investment philosophy holding that security prices are completely unpredictable, especially in the short term. Random walk theory states that both fundamental analysis and technical analysis are wastes of time, as securities behave randomly. Thus, the theory holds that it is impossible to outperform the market by choosing the "correct" securities; it is only possible to outperform the market by taking on additional risk. Critics of random walk theory contend that empirical evidence shows that security prices do indeed follow particular trends that can be predicted with a fair degree of accuracy. The theory originated in 1973 with the book, A Random Walk Down Wall Street. See also: Efficient markets theory.AcronymsSeewave numberwhite noise
Words related to white noisenoun a noise produced by a stimulus containing all of the audible frequencies of vibrationRelated Words- interference
- noise
- disturbance
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