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Topic: Amplitude distortion

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	Distortion - Wikipedia, the free encyclopedia
		The Mercator projection in cartography, for example, distorts Greenland because of its high latitude, in the sense that its shape is not that on a globe.
		In start-stop teletypewriter signaling, distortion is the shifting of the significant instants of the signal pulses from their proper positions relative to the beginning of the start pulse.
		The magnitude of the distortion is expressed in percent of an ideal unit pulse length.
	en.wikipedia.org /wiki/Distortion (478 words)

	AllRefer.com - distortion (Electrical Engineering) - Encyclopedia
		distortion, in electronics, undesired change in an electric signal waveform as it passes from the input to the output of some system or device.
		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.
	reference.allrefer.com /encyclopedia/D/distorti.html (278 words)

	Amplitude distortion - Wikipedia, the free encyclopedia
		Amplitude distortion is distortion occurring in a system, subsystem, or device when the output amplitude is not a linear function of the input amplitude under specified conditions.
		Amplitude distortion is measured with the system operating under steady-state conditions with a sinusoidal input signal.
		When other frequencies are present, the term "amplitude" refers to that of the fundamental only.
	en.wikipedia.org /wiki/Amplitude_distortion (84 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-09-29)
		This channel distortion may be caused by multipath due to reflections of the signaling within the communications medium 102, as well as the effect of non-linearities and noise contributions of devices such as amplifiers, filters, etc., coupled with ingress noise sources introduced into the medium over a given bandwidth in the communications path.
		As such, the phase distortion estimator 224 and the amplitude distortion estimator 222 may be a part of the receiver 206, at the same location as the receiver 206 or otherwise coupled to the receiver 206, either directly or through another communications medium.
		The phase distortion estimator 224 and the amplitude distortion estimator 222 may be implemented according to such a program of instructions, and the machine may include the transmitter 202 and the receiver 206.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/89130.011122&ELEMENT_SET=DECL (8920 words)

	Audio Note Philosophy (Site not responding. Last check: 2007-09-29)
		Harmonic distortion (the most commonly and easily measured anomaly in audio components) is generally caused by non-linearities in the electrical characteristics of the amplification devices.
		Such distortion is "harmonic", as the number of zero crossings in the error wave form in an integral multiple of the number of zero crossings in the fundamental.
		A small amount of this type of distortion is inaudible as it does not drastically alter the shape of the waveform and does not affect the zero crossing point.
	www.audionote.co.uk /anp2.htm (1842 words)

	Glossary (Site not responding. Last check: 2007-09-29)
		Amplitude tracking: The relative difference in the amplitude response between a reference filter and a filter under test.
		Distortion: Undesired changes in the purity of a signal, so that a spurious element or elements are added.
		These changes can be exhibited as amplitude distortion where the output does not bear the same proportion to the input at all frequencies or phase distortion or non linear phase shift.
	www.tte.com /2004/glossary.php (872 words)

	Sound Card Performance Test Techtalk Nonlinear Distortion (Site not responding. Last check: 2007-09-29)
		Linear Distortion, which is a form of error that creates no new frequencies beyond those that are present in the input signal.
		Nonlinear distortion is quantified by measuring the magnitude of each of the new frequencies that are created by the action of the nonlinear distortion mechanisms in the Unit Under Test (UUT).
		Its amplitude is the vector sum of the tones from the signal and various sources of distortion, which appear at that frequency.
	www.pcavtech.com /soundcards/techtalk/nlinear (1690 words)

	Non-linear signal processor - Patent 4315319
		Compensatory amplitude adjustment is made to a sampled signal in accordance with the statistical deviation of the signal from a preselected statistical model.
		In the case of a frequency distorting signalling medium of known, fixed properties, the technique of the inverse filter has been used, whereby a network having a transfer function which is the inverse of the transfer function for the signalling medium (i.e., telephone line or whatever), is employed.
		Such digital techniques have been applied to overcoming linear distortions in a transmission line and for compensation of deviations from a linear response (described by a classical linear differential equation or difference equation whose coefficients are not functions of the amplitude of the input signal).
	www.freepatentsonline.com /4315319.html (4797 words)

	audio amplifier
		The distortion certainly looks different, but the total load impedance is now lower, and also the harmonics are shifted in phase by the capacitance, and so little can be deduced from this.
		The distortion is estimated at 0.015%, showing that distortion is a little increased with this lower and reactive load, as expected.
		The distortion remains sharp and clear, simply varying in amplitude as the signal amplitude varies, whatever the rate of change.
	www.angelfire.com /ab3/mjramp/test.html (1033 words)

	Amplitude distortion (Site not responding. Last check: 2007-09-29)
		Amplitude distortion : Distortion occurring in a system, subsystem, or device when the output amplitude is not a linear function of the input amplitude under specified conditions.
		AM for the 21st Century Up-to-date, cost-effective amplitude modulation methods and technical articles.
		Guitar Distortion 101 A quick tour of the physics of distortion.
	www.serebella.com /encyclopedia/article-Amplitude_distortion.html (247 words)

	Sound Card Performance Test Techtalk Jitter or FM Distortion
		Amplitude domain distortion is the other kind of nonlinear distortion and is called AM distortion.
		Distortion that affects the size or timing of a signal without changing its shape is called linear distortion.
		FM distortion is distinguished from AM distortion by means of the inverted polarity of the lower sidebands created by FM distortion.
	www.pcavtech.com /techtalk/JIT/index.htm (1001 words)

	Distortion Charateristices of the Analog Section (Site not responding. Last check: 2007-09-29)
		It is our opinion that phase distortion is much more annoying than amplitude distortion because it affects the signal at a node.
		While amplitude distortion causes only an attenuation (or amplification) of the signal, phase distortion gives rise to enormous relative errors when the signal should be at or near zero.
		The signals are qualitatively different, and yet the manufacturer of such a circuit could advertise "0.000% Total Harmonic Distortion" and "perfect frequency response" for this device.
	www.danielsaudio.com /distortion.htm (286 words)

	United States Patent: 4,312,060
		Amplitude distortion occurs when the signal fed to the stage has an amplitude which drives the amplifier into a saturated state so as to clip the applied signal.
		Transient intermodulation distortion is generally caused by the inability of a negative feedback amplifier when presented with a fast changing input signal to feedback a needed feedback component in time to interact with the fast input signal.
		Distortion in preamplifiers has heretofore generally been measured by feeding a reference sine wave of a relatively modest audio frequency of between 1 KHz and 10 KHz into the preamplifier and measuring any distortion caused thereby.
	www.audioannals.com /04312060-Grodinsky-txt.htm (3945 words)

	Amplitude distortion (Site not responding. Last check: 2007-09-29)
		Amplitude distortion is measured with the system under steady-state conditions with a sinusoidal input signal.
		When other frequencies are present the "amplitude" refers to that of the fundamental only.
		The follow up to Social Distortions Somewhere Between Heaven and Hell seems to go back to the roots of punk, and leave behind the country inspired style(which I found great).I truly love this album there is so much raw power and statements dripping with s...
	www.freeglossary.com /Amplitude_distortion (378 words)

	TechOnLine - Characterizing an L-Band Pulse Amplifier with Local FFT and Wavelet Transforms (Site not responding. Last check: 2007-09-29)
		Among the possible causes of distortion are: amplifier non-linearity, oscillations due to the coupling of the RF transistor with input/output matching networks, and oscillations in the power supply lines.
		Since this distortion often cannot be efficiently analyzed by simulation, you must identify and eliminate it during the experimental phase of the design.
		Linear amplitude distortion may result in some in-band distortion and is the cause of spurious spectral lines.
	www.developonline.com /community/ed_resource/feature_article/20204 (3348 words)

	Phase distortion
		I had convinced myself that the phase distortion of a LR4, 24 dB/oct midrange to tweeter crossover is not audible, Ref.17.
		In retrospect I think that it might have been an increase of non-linear amplitude distortion in the midrange driver, which gave the impression of better bass.
		Phase distortion may increase the crest factor of the waveform (B above) and lead to non-linear distortion in the speaker and/or the ear producing a change in sound character.
	www.linkwitzlab.com /phs-dist.htm (1208 words)

	Stiffness-distortion sarcomere model for muscle simulation -- Razumova et al. 87 (5): 1861 -- Journal of Applied ...
		to cross-bridge cycling and for distortion imposed by shearing
		Amount of distortion due to this shearing motion is governed by balance between the velocity of sliding and the rate at which elements within states are formed and dissipated (see Eqs.
		Distortion induced by filament sliding is transient and is dissipated by distorted cross bridges leaving the population while being replaced by new cross bridges without shear-induced distortion.
	www.jap.org /cgi/content/full/87/5/1861 (5689 words)

	Distortion-compensating apparatus - US Patent 6766151 (Site not responding. Last check: 2007-09-29)
		As a distortion compensation apparatus of this kind, there is known a predistortion technology that is provided with compensation means having a reverse characteristic to the distortion of the power ampifier circuit.
		The added distortion is offset by distortion occurring in the power amplifying circuit 12; and as a result, the distortion is considered to be improved.
		4, when the amplitude characteristic curve 31 varies depending on the ambient environment and the like of the power amplifying circuit 12, the amplitude compensation data prestored in the first amplitude-compensation-data memory 7, which is shown by the amplitude characteristic curve 33, is not valid, and is insufficient for use in amplitude compensation.
	www.patentstorm.us /patents/6766151.html (6539 words)

	Toronto Surplus & Scientific Inc.
		This unit incorporates in a single compact enclosure an ultra low distortion sine-wave generator, a high performance total harmonic distortion measuring system and a wide range, high sensitivity signal level and noise measuring facility.
		Distortion monitor for external monitoring of the waveform with the fundamental removed
		The 339A measures total Harmonic Distortion, True RMS Volts and has a built-in sinewave oscillator which is phase-locked to the meter input receiver.
	www.torontosurplus.com /tes/tes09.htm (811 words)

	Doppler Distortion in loudspeakers
		Indeed, the existence of (velocity based) Doppler distortion in loudspeakers was originally established many years ago [Ref 1] and is maintained to this day.
		Based on this, the effect probably should not be called 'distortion' (although it must be said that anything that adds frequencies that did not exist in the original recording actually is distortion, but that is probably a philosophical debate rather than one to be considered by the engineering fraternity).
		Amplitude modulation is easily seen, and was also quite audible during the test - even with earmuffs.
	sound.westhost.com /doppler.htm (7400 words)

	[121.06] Wavefront Distortion Requirements for the LISA Mission (Site not responding. Last check: 2007-09-29)
		Distortions in the far field wavefronts can interact with jitter in the transmitted beam directions to give apparent variations in the distances between the test masses.
		Most of the aberration amplitude is expected to come from the optics before the telescope, rather than from the telescope itself.
		A total wavefront distortion amplitude of 0.05 wavelength (50 nm) rms or less appears to be adequate.
	www.aas.org /publications/baas/v36n5/aas205/842.htm (249 words)

	Phase, Time and Distortion in Loudspeakers
		This article is not for the faint hearted, as it discusses amplitude, phase and delay, and the complex interactions between them.
		The simple fact of the matter is that Doppler distortion is a furphy, not quite a lie, but a calculated twisting of the truth....
		Other distortion generators have been discussed - cone breakup, tweeters receiving significant power at their resonant frequency, and drivers expected to extend their response way past the point where they become highly directional.
	sound.westhost.com /ptd.htm (8959 words)

	Amplitude Distortion (Site not responding. Last check: 2007-09-29)
		An ideal signal has a constant amplitude and varying frequency.
		However, other signals or a low-quality transmission can cause the amplitude to vary as well.
		This is can be a cause of distortion, or static.
	www.ipfw.edu /math/h-calculus/pres1/sld006.htm (35 words)

	1999; Recognition of four band processed speech with distorted amplitude mapping (Site not responding. Last check: 2007-09-29)
		The envelope amplitudes extracted from each band were then compiled into a histogram to plot the distribution of instantaneous acoustic amplitudes.
		Based on the compiled histogram, amplitude distortion was introduced by peak and/or center clipping, compression and expansion, limited output range and level quantization.
		The systematically distorted amplitudes were used to modulate a wideband noise which was then spectrally limited by the original analysis filter.
	www.aro.org /archives/1999/282.html (196 words)

	Chapter 3
		The QMF bank is prone to three types of distortion: aliasing distortion, amplitude distortion, and phase distortion.
		The criteria for amplitude and phase distortion are the same.
		Again, when the filter bank is free from aliasing, amplitude distortion, and phase distortion, it is called a PR filter bank.
	www.music.miami.edu /programs/mue/research/jvandekieft/jvchapter3.htm (2442 words)

	NPL Acoustics: Finite amplitude distortion of the pulsed fields used in diagnostic ultrasound
		Finite amplitude distortion of the pulsed fields used in diagnostic ultrasound - Abstract
		It enables the distortion of the peak cycle of the pulse to be calculated from a few experimentally-measured parameters.
		It is particularly relevant for specifying the degree of distortion present, as might be required by future written standards for diagnostic equipment performance.
	www.npl.co.uk /acoustics/publications/articles/32.html (129 words)

	Amplitude Distortion (Site not responding. Last check: 2007-09-29)
		The information in a signal is contained by the frequency, not the amplitude.
		Thus, the amplitude can be made constant with little loss of intelligence.
		The component of a radio that does this is call a limiter.
	www.ipfw.edu /math/h-calculus/pres1/tsld008.htm (37 words)

	Amplitude Distortion Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-09-29)
		Looking For amplitude distortion - Find amplitude distortion and more at Lycos Search.
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	www.quiltplace.com /search/encyclopedia/Amplitude_distortion (259 words)

	Amplitude distortion -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-29)
		Amplitude distortion -- Facts, Info, and Encyclopedia article
		Amplitude distortion is measured with the system operating under steady-state conditions with a sinusoidal input (Any communication that encodes a message) signal.
		When other frequencies are present, the term "amplitude" refers to that of the (The lowest tone of a harmonic series) fundamental only.
	www.absoluteastronomy.com /encyclopedia/a/am/amplitude_distortion.htm (52 words)

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