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单词 distortion
释义

distortion


dis·tor·tion

D0294700 (dĭ-stôr′shən)n.1. a. The act or an instance of distorting.b. The condition of being distorted.2. A statement that twists fact; a misrepresentation.3. a. The alteration of the original form of a signal representing an image, a sound, a waveform, or other information.b. A visible or audible effect of such an alteration, such as the warping of an image or noise in an audio recording.4. Psychology The modification of unconscious impulses into forms acceptable by conscious or dreaming perception.
dis·tor′tion·al, dis·tor′tion·ar′y, dis·tor′tive adj.

distortion

(dɪˈstɔːʃən) n1. the act or an instance of distorting or the state of being distorted2. something that is distorted3. (General Physics) an aberration of a lens or optical system in which the magnification varies with the lateral distance from the axis4. (Electronics) electronics a. an undesired change in the shape of an electromagnetic wave or signalb. the result of such a change in waveform, esp a loss of clarity in radio reception or sound reproduction5. (Psychology) psychol a change in perception so that it does not correspond to reality6. (Psychoanalysis) psychoanal the disguising of the meaning of unconscious thoughts so that they may appear in consciousness, e.g. in dreams disˈtortional adj

dis•tor•tion

(dɪˈstɔr ʃən)

n. 1. an act or instance of distorting. 2. the state of being distorted. 3. anything distorted, as an image or electronic signal. 4. an aberration of a lens or system of lenses in which the magnification of the object varies with the lateral distance from the axis of the lens. [1575–85; < Latin] dis•tor′tion•al, adj.
Thesaurus
Noun1.distortion - a change for the worsedistortion - a change for the worse deformationdamage, impairment, harm - the occurrence of a change for the worsewarping, warp - a moral or mental distortion
2.distortion - a shape resulting from distortiondistorted shapeshape, form - the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"crookedness, torsion, tortuosity, tortuousness, contortion - a tortuous and twisted shape or position; "they built a tree house in the tortuosities of its boughs"; "the acrobat performed incredible contortions"buckle, warp - a shape distorted by twisting or foldinggnarl, knot - something twisted and tight and swollen; "their muscles stood out in knots"; "the old man's fists were two great gnarls"; "his stomach was in knots"
3.distortion - an optical phenomenon resulting from the failure of a lens or mirror to produce a good imagedistortion - an optical phenomenon resulting from the failure of a lens or mirror to produce a good imageoptical aberration, aberrationchromatic aberration - an optical aberration in which the image has colored fringesoptical phenomenon - a physical phenomenon related to or involving lightspherical aberration - an optical aberration resulting in a distorted image
4.distortion - a change (usually undesired) in the waveform of an acoustic or analog electrical signal; the difference between two measurements of a signal (as between the input and output signal); "heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion"acoustic phenomenon - a physical phenomenon associated with the production or transmission of soundelectrical phenomenon - a physical phenomenon involving electricityamplitude distortion, nonlinear distortion - distortion that occurs when the output signal does not have a linear relation to the input signal
5.distortion - the act of distorting something so it seems to mean something it was not intended to meanoverrefinement, twisting, straining, torturefalsification, misrepresentation - a willful perversion of facts
6.distortion - the mistake of misrepresenting the factserror, fault, mistake - a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults"

distortion

noun1. misrepresentation, bias, slant, perversion, falsification, colouring He accused reporters of wilful distortion.2. deformity, bend, twist, warp, buckle, contortion, malformation, crookedness, twistedness the gargoyle-like distortion of her face
Translations
失真歪曲

distort

(diˈstoːt) verb1. to make or become twisted out of shape. Her face was distorted with pain; Metal distorts under stress. 扭曲,歪曲 扭曲,歪曲 2. to make (sound) indistinct and unnatural. Her voice sounded distorted on the telephone. 扭曲(聲音、事實),曲解(某人的話) 曲解,失真 diˈstortion (-ʃən) noun 扭曲,歪曲 歪曲,失真

distortion


distortion,

in electronics, undesired change in an electric signal waveform as it passes from the input to the output of some system or device. In an audio system, distortion results in poor reproduction of recorded or transmitted sound. In passing through an electronic device, the amplitude of an input signal may be changed. For example, any voltage that is applied to an amplifier may be increased by a factor of 10. Amplitude distortion occurs when this factor is not the same for all input voltages. Frequency distortion occurs when the amplitudes of the different frequency components of an input signal are changed by a factor that is not the same for all frequencies. Phase distortion occurs when there is a phase shift between a system's output- and its input-signal components. It occurs because the time of propagation through a system can vary with frequency. Intermodulation distortion, also known as cross modulation, results from the mixing of signals in a non-linear system; the output will contain the sums and differences of the input signals' harmonics. Some kinds of distortion are subjectively more objectionable than others.

distortion

(field distortion) An aberration of a lens or mirror in which the image has a distorted shape as a result of nonuniform lateral magnification over the field of view. In barrel distortion the magnification decreases toward the edge of the field; in pincushion distortion there is greater magnification at the edge.

Distortion

 

an image defect in optical systems that causes the disruption of the geometric similarity between the object and its image; one of the aberrations of optical systems. Distortion arises as a result of the fact that the linear magnification of various parts of the image is different. A characteristic example of the distortions generated by the system involving distortion is the image of a square shown in Figure 1. A pincushion, or positive, distortion is shown on the left; a barrel, or negative, distortion is shown on the right. Distortion does not affect the sharpness of the image. The distortion of an optical system is quantitatively characterized by the so-called relative distortion v = (β/β0) - 1, where β0 is the linear magnification of the ideal system without distortion and β is the actual magnification. The relative distortion is expressed in percent.

Figure 1

Distortion is particularly undesirable in photographic lenses used in geodesy or photogrammetry. The quantity v is about 0.5 percent in good photographic lenses. Distortion is –0.01 percent in lenses used for aerial photography. In some cases (symmetrical photographic lenses or telescopes), distortion may be eliminated.

distortion

[di′stȯr·shən] (electronics) Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium. (engineering) In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output. (engineering acoustics) Any undesired change in the waveform of a sound wave. (optics) A type of aberration in which there is variation in magnification with the distance from the axis of an optical system, so that images are not geometrically similar to their objects.

Distortion (electronic circuits)

The behavior of an electrical device or communications system whose output is not identical in form to the input signal. In a distortionless communications system, freedom from distortion implies that the output must be proportional to a delayed version of the input, requiring a constant-amplitude response and a phase characteristic that is a linear function of frequency.

In practice, all electrical systems will produce some degree of distortion. The art of design is to see that such distortion is maintained within acceptable bounds, while the signal is otherwise modified in the desired fashion. In general, distortion can be grouped into four forms: amplitude (nonlinear), frequency, phase, and cross modulation.

Amplitude distortion

All electronic systems are inherently nonlinear unless the input signal is maintained at an incrementally small level. Once the signal level is increased, the effects of device nonlinearities become apparent as distorted output waveforms. Such distortion reduces the output voltage capability of operational amplifiers and limits the power available from power amplifiers. Amplitude distortion may be reduced in amplifier stages by the application of negative feedback. See Amplifier, Feedback circuit, Operational amplifier

Frequency distortion

No practical device or system is capable of providing constant gain over an infinite frequency band. Hence, any nonsinusoidal input signal will encounter distortion since its various sinusoidal components will undergo unequal degrees of amplification. The effects of such distortion can be minimized by designing transmission systems with a limited region of constant gain. Thus, in high-fidelity systems, the amplifier response is made wide enough to capture all the harmonic components to which the human ear is sensitive.

Phase distortion

Since the time of propagation through a system varies with frequency, the output may differ in form from the input signal, even though the same frequency components exist. This can easily be demonstrated by noting the difference between the addition of two in-phase sine waves and two whose phase relationship differs by several degrees. In digital systems, such changes can be significant enough to cause timing problems. Hence, the phase-frequency response must be made linear to obtain distortionless transmission. See Equalizer

Cross modulation

Sometimes referred to as intermodulation, this occurs because of the nonlinear nature of device characteristics. Thus, if two or more sinusoidal inputs are applied to a transistor, the output will contain not only the fundamentals but also signal harmonics, sums and differences of harmonics, and various sum or difference components of fundamental and harmonic components. While these effects are generally undesirable, they may be utilized to advantage in amplitude modulation and diode detection (demodulation). See Amplitude-modulation detector, Amplitude modulator

distortion


distortion

 [dis-tor´shun] 1. the state of being twisted out of a natural or normal shape or position.2. in psychology, the process of altering or disguising unconscious ideas or impulses so that they become acceptable to the conscious mind.3. in optics or radiology, deviation of an image from the true outline or shape of an object or structure; it may be a change in size or shape, an elongation, a foreshortening, or a magnification. See illustration.A, Barrel distortion; B, pincushion distortion. From Dorland's, 2000.

dis·tor·tion

(dis-tōr'shŭn), 1. psychiatry a defense mechanism that helps to repress or disguise unacceptable thoughts. 2. dentistry permanent deformation of the impression material after the registration of an imprint. 3. A twisting out of normal shape or form. 4. ophthalmology unequal magnification over a field of view. [L. distortio, fr. dis-torqueo, to wrench apart]

distortion

(dĭ-stôr′shən)n. Psychology The modification of unconscious impulses into forms acceptable by conscious or dreaming perception.
dis·tor′tion·al, dis·tor′tion·ar′y, dis·tor′tive adj.

dis·tor·tion

(dis-tōr'shŭn) 1. psychiatry A defense mechanism that helps to repress or disguise unacceptable thoughts. 2. dentistry The permanent deformation of the impression material after the registration of an imprint. 3. A twisting out of normal shape or form. 4. ophthalmology Unequal magnification over a field of view. [L. distortio, fr. dis-torqueo, to wrench apart]

distortion

Aberration of an optical system resulting in an image which does not conform to the shape of the object, somewhat resembling the image viewed through a cylindrical lens. This is due to an unequal magnification of the image. Distortion can be barrel-shaped (barrel-shaped distortion) in which the corners of the image of a square are closer to the centre than the middle part of the sides; or pincushion (pincushion distortion) in which the corners of the image of a square are farther from the centre than the middle part of the sides (Fig. D10). Example of barrel-shaped distortion: a square object seen through an uncorrected negative spectacle lens. Example of pincushion distortion: a square object seen through an uncorrected positive spectacle lens. See correction; fisheye lens; sine condition.enlarge picture" >Fig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)enlarge pictureFig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)

dis·tor·tion

(dis-tōr'shŭn) 1. In dentistry, permanent deformation of the impression material after the registration of an imprint. 2. A twisting out of normal shape or form. [L. distortio, fr. dis-torqueo, to wrench apart]

Patient discussion about distortion

Q. what does c4-5 mild central disk bulging impinging upon cervical cord without spinal stenosis or distortion of the cord . mild righ neural foraminal narrowing from uncovertebral joint hypertropy meanA. Well this basically means there is a very small narrowing of the cervical (your neck area) spinal canal (where the spinal cord is), however the narrowing does not cause any damage to the spinal cord, therefore probably does not cause any major symptoms involving the nerves. The c4-5 bulging part refers to the part in between the two cervical vertebras c4 and c5, in which the disc (a part in the spinal cord) is sliding a bit side-ways, but again, it does not seem to be causing any trouble.

More discussions about distortion

See distortion

distortion


  • noun

Synonyms for distortion

noun misrepresentation

Synonyms

  • misrepresentation
  • bias
  • slant
  • perversion
  • falsification
  • colouring

noun deformity

Synonyms

  • deformity
  • bend
  • twist
  • warp
  • buckle
  • contortion
  • malformation
  • crookedness
  • twistedness

Synonyms for distortion

noun a change for the worse

Synonyms

  • deformation

Related Words

  • damage
  • impairment
  • harm
  • warping
  • warp

noun a shape resulting from distortion

Synonyms

  • distorted shape

Related Words

  • shape
  • form
  • crookedness
  • torsion
  • tortuosity
  • tortuousness
  • contortion
  • buckle
  • warp
  • gnarl
  • knot

noun an optical phenomenon resulting from the failure of a lens or mirror to produce a good image

Synonyms

  • optical aberration
  • aberration

Related Words

  • chromatic aberration
  • optical phenomenon
  • spherical aberration

noun a change (usually undesired) in the waveform of an acoustic or analog electrical signal

Related Words

  • acoustic phenomenon
  • electrical phenomenon
  • amplitude distortion
  • nonlinear distortion

noun the act of distorting something so it seems to mean something it was not intended to mean

Synonyms

  • overrefinement
  • twisting
  • straining
  • torture

Related Words

  • falsification
  • misrepresentation

noun the mistake of misrepresenting the facts

Related Words

  • error
  • fault
  • mistake
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更新时间:2025/3/1 0:56:22