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limiter

 
Dictionary: lim·it·er   (lĭm'ĭt-ər) pronunciation
n.
  1. One that limits: a limiter of choices.
  2. Electronics. A circuit that prevents the amplitude of a waveform from exceeding a specified value. Also called clipper.

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Sci-Tech Encyclopedia: Limiter circuit
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A device whose purpose is to ensure that the amplitude of a sensed variable (referred to as a signal) is constrained or limited to lie within prescribed maximum and minimum values. It is more properly termed an amplitude limiter, although convention usually dispenses with the important modifier. Also, unless specified otherwise, the limiting is applied to voltage.

Strictly speaking, the limiter should behave as a perfectly linear device (such as an ideal amplifier or even a piece of wire) until the amplitude of the input signal reaches the upper or lower limit values. In other words, the output of an ideal limiter matches the input perfectly when the input is between the limit values. If the input is greater than the upper limit, the output equals the upper limit; if the input is less than the lower limit, the output equals the lower limit. If the upper and lower limits are equal in magnitude, the limiting is symmetrical. In the past, one or two stages of high-gain amplification would often precede a limiter in order to obtain clean limiting. See also Linearity.

The term limiter is often used to mean sign detector, so that when the input is greater than zero, the output equals some fixed positive value; when the input is less than zero, the output is the negative of this value. This usage is sometimes employed in discussing frequency-modulation (FM) radio receivers.

Discrete-component limiters have become rare. The cost/performance ratio of integrated circuits makes them the only rational choice for commercial applications. Most often, integrated circuits now contain limit operations that are both functionally and physically integrated with companion operations to form a higher-level function. The isolated need for a limit-only function is almost never encountered. Limiting within an integrated circuit is usually obtained by designing an amplifier to be heavily overdriven and therefore to quickly enter the saturation (limiting) range. See also Amplifier; Integrated circuits.


Architecture: limiter
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A special-purpose fuse (usually of high current-interrupting rating) designed to protect an electrical circuit or equipment from the effects of high available short-circuit current by limiting the amount of current permitted to flow through it.


Circuit or device that prevents some portion of its input from reaching the output. A clipper.


Wikipedia: Limiter
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In electronics, a limiter is a circuit that allows signals below a specified input power to pass unaffected while attenuating the peaks of stronger signals that exceed this input power.

An FM radio receiver usually has at least one stage of amplification for this purpose. It provides a constant level of signal to the FM demodulator stage, reducing the effect of signal level changes in the output. If two or more signals are received at the same time, a high performance limiter stage can greatly reduce the effect of the weaker signals on the output. This is commonly referred to as the FM capture effect.

Generally, FM demodulators are not affected by amplitude variations, since the baseband is contained in the frequency deviations. Some detectors, including the Ratio Detector, inherently limit gain by a nature of the circuit design. In AM radio, the intelligence is located in the amplitude variations, and distortion can occur due to spurious signals that could cause the baseband to be misrepresented.

Mastering engineers often use limiting combined with make-up gain to increase the perceived loudness of an audio recording during the audio mastering process.

See also


Translations: Limiter
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Dansk (Danish)
n. - begrænser

Nederlands (Dutch)
signaalbegrenzer

Français (French)
n. - borne, limitation

Deutsch (German)
n. - (Amplituden)begrenzer

Ελληνική (Greek)
n. - ρυθμιστής

Italiano (Italian)
limitatore

Português (Portuguese)
n. - limitador (m) (Téc.)

Русский (Russian)
ограничитель, монах, который мог собирать подаяние на ограниченной территории

Español (Spanish)
n. - limitador

Svenska (Swedish)
n. - begränsare

中文(简体)(Chinese (Simplified))
限制者

中文(繁體)(Chinese (Traditional))
n. - 限制者

한국어 (Korean)
n. - 제한하는 사람, 진폭 제한기

日本語 (Japanese)
n. - 制限する人, リミッター, 振幅制限器

العربيه (Arabic)
‏(الاسم) محدد‏

עברית (Hebrew)
n. - ‮מגביל‬


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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved.  Read more
Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Electronics Dictionary. Copyright 2001 by Twysted Pair. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Limiter" Read more
Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved.  Read more