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Topic: Automatic gain control

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	U.S. Patent: 5761164 - Gain control device for servo control - June 2, 1998
		An automatic gain control device according to claim 1, further comprising disturbance source for generating a disturbance signal and mixing the disturbance signal to the servo loop, and said gain control means detecting the gain of the servo loop on the basis of the level of the disturbance signal.
		The automatic gain control block 8 varies levels of the error signals supplied from the pre-amplifier 5 to be predetermined signal levels suitable for the servo control, and the servo equalizer 9 adjusts frequency for servo control.
		The automatic gain control block 58 varies levels of the error signals supplied from the pre-amplifier 55 to be predetermined signal levels suitable for the servo control, and the servo equalizer 59 adjusts frequency for servo control.
	www.everypatent.com /comp/pat5761164.html (8112 words)

	Automatic gain control - Wikipedia, the free encyclopedia
		The AGC circuit keeps the receiver in its linear operating range by measuring the overall strength of the signal and automatically adjusting the gain of the receiver to maintain a constant level of output.
		It is usually not advantageous to reduce the gain of the front end of the receiver on weak signals, to maximise signal to noise ratio, and keep the first stage in the linear range for blocking rejection.
		AGC is also found in many types of tape recorder, including basic cassette decks and VCRs, the object being to record to tape a good quality signal but one that does not saturate the tape and cause distortion and other problems, even if the signal to be recorded varies in level.
	en.wikipedia.org /wiki/Automatic_gain_control (514 words)

	Automatic gain control circuit - Patent 6512554
		Further, the AGC voltage outputted from the detector 24 is to be inputted to the AGC voltage input terminal 21b of the tuner 21 through an automatic gain control voltage selector switch (hereinafter called "AGC voltage selector switch") 26.
		As a result, the amplification of the gain variable amplifier 1c of the tuner 1 is lowered to thereby amplify the input analog broadcast signal smaller, whereby the level of the IF signal outputted from the gain variable amplifier 1c of the tuner 1 and inputted to the demodulator 5 is kept constant.
		The first control voltage is inputted to the other end of the first resistor and the second control voltage is inputted to the base of the transistor, whereby the automatic gain control voltage is outputted from the collector of the transistor.
	www.freepatentsonline.com /6512554.html (2908 words)

	U.S. Patent: 5519888 - Receiver incorporating an other users noise simulator (OUNS) for use in a communication system - ...
		The voltage controlled attenuator (VCA) is controlled by an OUNS controller such that the output of the VCA represents the desired other user noise level to be combined with the received signal in the automatic gain controller.
		control means for setting a simulated noise level, said control means having a first output coupled to a control input of said first voltage controlled attenuator means and a second output coupled to a control input of said second voltage controlled attenuator means.
		A second input of AGC 20 is coupled to the output of reference 16 and the output of AGC 20 is the output of device 10.
	www.everypatent.com /comp/pat5519888.html (4759 words)

	AGC - Automatic Gain Control
		Automatic Gain Control - A feedback control circuit which maintains the gain or output power level of an amplifier constant over a wide range of input signal levels.
		Automatic Gain Control - a type of compressor that is usually used in the recording circuit of domestic cassettes (but is also used successfully in Minidisk Reporter Kits) to control the input signal level.
		AGC is the abbreviation of Automatic Gain Control and is a feature in some CD-Rom drives.
	www.auditmypc.com /acronym/AGC.asp (558 words)

	IF Signal Processing Components and subsystems
		This is achieved by controlling amplifier gain using a coupled linear detector to rectify the RF signal and amplify the detected signal, using one or more operational amplifiers to provide the appropriate DC-control voltage.
		AGC measurement is taken from the same setup and is measured from the point before the RF envelope begins to fall outside the specified output power variation to the point of no signal.
		Gain control range can be measured using either a swept or CW source and the appropriate power-measuring device.
	www.miteq.com /micro/ifsignal/c17b/definitionsappl.html (1982 words)

	Digital automatic gain control circuit - Patent 3983381 (Site not responding. Last check: 2007-10-07)
		Thus, the function of the control loop is to maintain the average value of S.sub.1, the AGC output, at a constant value equal to the parameter k.sub.1 as the average value of the input, S.sub.o, varies over a large range.
		The control is accomplished by having the error between the average value of S.sub.1 and the desired k.sub.1 drive an accumulator (28, 29).
		The absolute value of the accumulator output is the gain control parameter, G. The action of the control loop is for the accumulator to change until a value of G is reached such that the average of S.sub.1 is equal to k.sub.1.
	www.freepatentsonline.com /3983381.html (4399 words)

	EOPC - Automatic Gain Control Amplifier (AGC) Drivers
		The AGC driver, a feedback amplifier, operates a broad range of resonant optical scanners and resonant optical choppers at their natural frequency.
		The AGC driver has an Automatic Gain Control circuit which automatically regulates the motion amplitude of the resonant device.
		A trimpot control permits the user to adjust the phase of the reference signals with respect to the position of the mirror or the vane.
	www.eopc.com /driver_agc.html (327 words)

	(WO/1989/002190) AUTOMATIC GAIN CONTROL SYSTEM (Site not responding. Last check: 2007-10-07)
		In a first mode, in which the erased portion of a sector is being detected, the AGC multiplexer couples an input preset signal of a predetermined voltage level to the AGC circuit, enabling it, in turn, to generate a gain control signal to control the gain to a predetermined level.
		In a second mode, the AGC multiplexer couples a signal related to the output signal from the amplifier to the AGC circuit, enabling the AGC circuit to generate a gain signal related to the output level of the amplifier.
		In the third mode, the AGC multiplexer maintains its output signal constant, thus enabling the AGC circuit to maintain its gain control constant.
	www.wipo.int /pctdb/en/wo.jsp?WO=1989/02190 (289 words)

	Delayed Automatic Gain Control
		The disadvantage of automatic gain control, attenuating even the weak signal, is overcome by the use of delayed automatic gain control (dagc).
		The agc diode is connected to the primary of the last IF transformer and the detector diode to its secondary.
		When you vary the bfo control, you are varying the output frequency of the bfo and will hear changes in the tone of the output audio signal.
	www.tpub.com /neets/book17/74e.htm (872 words)

	Define AGC - Automatic Gain Control
		Meaning of AGC – “Automatic Gain Control”, A circuit which automatically normalizes the the output of an electronic component by boosting or lowering incoming signals to match a preset level so that that the output signal level is virtually constant.
		Automatic gain control optimization in a radar tracking system - by by Richard Randolph Gillock.
		Automatic gain control for an HF Doppler radar receiver - by J. D Forberg.
	www.birds-eye.net /definition/a/agc-automatic_gain_control.shtml (463 words)

	Douglas T. Smith Editorial Services (Site not responding. Last check: 2007-10-07)
		Automatic gain control or AGC does the job by setting receiver gain to be inversely proportional to input level.
		Placing the digital gain boost inside the AGC loop assures that a constant peak output level will be maintained even in the face of minor variations in analog gain control.
		Digital AGC copes with that by detecting older signals and applying the gain change to more-recent signals before they are output.
	www.doug-smith.net /digitalagc.htm (2166 words)

	Automatic Gain Control (Site not responding. Last check: 2007-10-07)
		The Adaptive Digital Technologies Automatic Gain Control (AGC) algorithm is used to automatically adjust the speech level of an audio signal to a predetermined value.
		The AGC algorithm can be used to maintain the speech levels from these various sources at a common level so that subsequent processing operates on signals within a specified dynamic range.
		The AGC algorithm performs gain adjustments incrementally at a rate determined by the input signal level to avoid distortion of the output signal.
	www.adaptivedigital.com /products/specs/agc_54x.htm (147 words)

	Gain - Wikipedia, the free encyclopedia
		In electronics, gain is usually taken as the mean ratio of the signal output of a system to the signal input of the system.
		A gain of five would imply that either the voltage or power is increased by a factor of five.
		A gain of factor 1 or (equivalent to 0 dB) where both input and output are at the same voltage level is also known as unity gain.
	en.wikipedia.org /wiki/Gain (303 words)

	Automatic Gain Control Circuits Links
		Gain Programmable Circuit Offers Performance and Flexibility: 12/24/04 EDN Design Ideas / (added 12/04) You can use a standard precision instrumentation amplifier, such as the INA118 or AD623, as a gain-programmable amplifier with high accuracy and wide gain range.
		During the calibration cycle, the test equipment calculates the AGC output voltage necessary to achieve the accuracy requirements and then increments the AGC....
		Low Noise AC Amplifier has Digital Control of Gain and Bandwidth: 02/05/04 EDN Design Ideas / (added 6/06) In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR.
	www.discovercircuits.com /A/autogain.htm (391 words)

	Automatic Gain Control (AGC) - Cockos Confederated Forums
		If we set the gain to allow for empassioned screams and shouts, the calmer passages (almost) fall into the noise or sound like they are in a big cavern.
		If REAPER could start to decrement the gain based on a settable attach rate when a channel reaches a set threshold and restores the gain after the channel "settles" based on a decay rate, I think an elegant solution could be had.
		For AGC, which tends to take a longer term view of the world compared to a peak limiter, the length of the buffer would need to be seconds rather than ms.
	www.cockos.com /forum/showthread.php?t=1928 (2523 words)

	Computer Telephony Glossary: AGC Automatic Gain Control (Site not responding. Last check: 2007-10-07)
		AGC is an electronic circuit in tape recorders, speakerphones, and other voice devices which is used to maintain volume.
		AGC is not always a brilliant idea, since AGC will attempt to produce a constant volume level.
		Manual Gain Control is preferred in professional applications.
	www.voicesaver.com /glossary/g_agc.htm (107 words)

	Analog Designs Crave Dynamic Gain Control
		In speech-processing or communications systems, AGC is generally employed to keep a signal's amplitude within the boundaries of the subsequent communications channel.
		Using AGC prior to applying some form of modulation can prevent certain types of distortion from being induced as the signal is transferred over some medium.
		That voltage is then used to control the gain of the voltage-controlled amplifier.
	www.wsdmag.com /Articles/ArticleID/8343/8343.html (1205 words)

	An Overview of Automatic Level Control - Maxim/Dallas
		Automatic Level Control (ALC) is a technology that automatically controls output power to the speaker.
		This is the time it takes for the gain to return to its normal level after the input signal fell below the threshold level and the hold time expired.
		Release time is further defined as release from a 6dB gain compression to 10% of the nominal gain setting, after the input signal has fallen below the PREF (pin 29) threshold and the 50ms hold time has expired.
	www.maxim-ic.com /appnotes.cfm/appnote_number/3673 (638 words)

	Japanese Patent 3713206 B2 - automatic gain control circuit (Site not responding. Last check: 2007-10-07)
		It controls at first automatic gain control voltage which did first intermediate frequency signal of before domain restriction of first step variable gain amplifier which makes signal of same channel which is outputed from antenna of plural which was established by different location amplifying each classified by gain signal detection,
		gain of variable gain amplifier which does first intermediate frequency signal of the after did second intermediate frequency signal which did first intermediate frequency signal after domain restriction frequency conversion signal detection domain restriction at second automatic gain control voltage amplifying is controlled,
		It is based on input level which was decided said and is connected the length sequel respectively to above-mentioned first step variable gain amplifier, so it is besides automatic gain control circuit.
	cxp.paterra.com /jppatent3713206.html (225 words)

	Page 22--Sound > Automatic Gain Control
		However, if the automatic gain control is ON, then it will boost the sound of the rain when the person pauses--because automatic gain control always wants something to be full volume.
		In that quiet moment, the automatic gain control will hunt for whatever sound it can find--say the humming air conditioner--and bring up that sound to "healthy" levels.
		The bottom line is that it is OK to use automatic gain when you are learning--with the understanding that at some point, you'll need to give it up and learn to control levels manually.
	www.video101course.com /300sound310.html (362 words)

	SYMETRIX 422 AUTOMATIC GAIN CONTROL AT KABUSA.COM
		Control settings range from imperceptible operation to fat "in your face" density.
		Automatic gain control is a very specialized process.
		Only around 5% of the discs, those mastered at the lowest gains, are not brought up to this level completely.
	www.kabusa.com /symtx422.htm (360 words)

	Automatic Gain Control (AGC) (Site not responding. Last check: 2007-10-07)
		Automatic Gain Control is a nonlinear process, usually applied to waveforms containing two or more signals, such as a telephone conversation, and one signal source is considerably weaker than the other.
		By proper selecting the parameters of the AGC function a significant increase of intelligibility can be obtained.
		Figure 43: Default settings of the AGC function: The user is invited to start with these default settings.
	www.kfs.oeaw.ac.at /software/stx_manual/stx_help_html/423.htm (118 words)

	Simple AGC (automatic gain control) algorithm (Site not responding. Last check: 2007-10-07)
		Rapid gain reduction is needed to handle sudden increases in signal.
		An AGC circuit is a volume compressor -- half of a compander.
		AGC level to stay reasonably constant during the pauses.
	www.dsprelated.com /showmessage/21943/1.php (3103 words)

	Hulya Yalcin: Background Estimation under Rapid Gain Change in Thermal Imagery
		We consider detection of moving ground vehicles in airborne sequences recorded by a thermal sensor with automatic gain control, using an approach that integrates dense optic flow over time to maintain a model of background appearance and a foreground occlusion layer mask.
		However, the automatic gain control of the thermal sensor introduces rapid changes in intensity that makes this difficult.
		We develop a method for gain estimation and compensation that uses sparse flow of corner features to compute the affine back- ground scene motion that brings pairs of frames into alignment prior to estimating change in pixel brightness.
	www.cs.cmu.edu /~hulya/GainCompensationInThermalImagery.html (285 words)

	(WO/2000/077924) DIGITAL AUTOMATIC GAIN CONTROL (Site not responding. Last check: 2007-10-07)
		A gain correction unit (23) is responsive to an attenuate command and amplify command coming from a feedback system monitoring the AGC's output.
		Additionally, the present AGC also includes a transition region detector (25) that monitors the input signal applied to the AGC (13) to form a feedforward system.
		The transition region detector (25) producing a control output to selectively permit the gain correction unit (23) to respond to an attenuate or amplify command.
	www.wipo.int /pctdb/en/wo.jsp?KEY=00/77924.001221 (276 words)

	Automatic Gain Control (AGC) Software - GAO Research (Site not responding. Last check: 2007-10-07)
		It adaptively controls the dynamic range of a speech signal without amplifying the noise between words and phrases.
		AGC is an ideal solution for applications requiring consistent audio levels.
		GAO also adheres to stringent quality control procedures, which is reflected in our well structured code, detailed design documentation, and well-defined design and test plans.
	www.gaoresearch.com /products/telephony/other/agc.php (305 words)

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