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Topic: Circuit noise level

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	Channel noise level - Wikipedia, the free encyclopedia
		The ratio of the channel noise at any point in a transmission system to an arbitrary level chosen as a reference.
		Note 1: The channel noise level may be expressed in (a) dB above reference noise (dBrn), (b) dB above reference noise with C-message weighting (dBrnC), or (c) adjusted dB (dBa).
		Note 2: Each unit used to measure channel noise level reflects a circuit noise reading of a specialized instrument designed to account for different interference effects that occur under specified conditions.
	en.wikipedia.org /wiki/Channel_noise_level (156 words)

	EP0336684 (Site not responding. Last check: 2007-10-20)
		Description Noise Reduction in the Playback of Recorded Sound Field of Invention This invention concerns methods and apparatus for the reduction of unwanted spurious noise during the playing of recordings (such as records or film tracks) in which at least two different copies of an original recording are available.
		By using an impulsive noise detection and suppression circuit, the noise signal level in the signal finally delivered to the adaptive noise suppression circuit of the invention can be wholly accommodated within the capabilities of the latter circuit enabling the latter to function at optimum efficiency.
		These are (A) the impulsive noise itself, (B) the effect of the past p noise samples smeared to the present time by the action of the inverse filtering, and (C) the inflation in the variance of the excitation signal caused by the error in the parameter vector estimation.
	swpat.ffii.org /pikta/txt/ep/0336/684 (2338 words)

	EP0421259 (Site not responding. Last check: 2007-10-20)
		The allowable noise level is also selected to be higher in a direction towards the lower energy or higher frequency of the frequency band so that the number of bits of allocation will be lesser for higher frequencies.
		The output of the filter circuit 15 is supplied to a subtractor 16 where a level alpha corresponding to the allowable noise level in the convolved region is found.
		In this case, the quantization noise level consistent with the detection output the output data volume of quantization means is increased or decreased by the number of bits allocated to each channel for adjusting the number of quantization bits for each block so as to be constant.
	swpat.ffii.org /pikta/txt/ep/0421/259 (3783 words)

	Noise control
		Noise with significant measured levels (in dB) at high or low frequencies will not be as annoying as it would be when its energy is concentrated in the middle frequencies.
		The maximum acceptable background noise level generated by the mechanical systems in buildings is usually specified in terms of average A-weighted sound levels, NC, RC, or NCB.
		The noise criteria (NC) values are determined from the measurements of the octave-band sound levels in an occupied room when the air-conditioning system is on.
	home.tir.com /~ms/noisecontrol/noisecontrol.html (714 words)

	Noise Canceling Circuit (Site not responding. Last check: 2007-10-20)
		The noise level certainly decreased, it was only by a few db and the tuning seemed fairly broad.
		In use, the circuit is able to reduce local noise on the 20 Metre band from S 8 to 9 down to zero with very little effect on received signals, apart from them leaping out of the noise.
		Also, it is not very effective with noise that is at a greater distance and is received via skip, as this tends to be multi-path, these end up as more than one signal from more than one direction.
	www.geocities.com /g4lna/noisdes.html (532 words)

	Fan Noise Solutions
		Another important point is that the noise figure you see quoted is measured with the fan suspended in the middle of an empty chamber; the noise you actually hear is with the fan fastened to a metal box, a grille of sorts on one end, and various cables and components in the flow path.
		State of the art is such that the main difference between a cheap generic fan and a more expensive one is quality – better bearings, better finished mouldings, which have a minor impact on as-new noise levels but may well help keep the level consistent for longer.
		Following the chart, flow at that noise level will be about 24 cfm.
	www.cpemma.co.uk (1461 words)

	Custom circuit design as a driver of microprocessor performance
		Achieving the packing density implied by the figure demands a high level of understanding of the connectivity of the dataflow and typically requires a heavy investment in time on the part of the designer, who is likely to arrive at an optimal solution only after a lengthy period of trial and error.
		This circuit is a compound domino structure in which the inverter is replaced with a NOR gate [11], which gives both buffering and logic for faster performance.
		The G4 circuit in 7S SOI is the second level of logic within the adder (Figure 11); the first level is the dynamic buffers.
	www.research.ibm.com /journal/rd/446/allen.html (11061 words)

	Telecommunications: Overcoming Network Impairments - Industry Trend or Event
		Its function involves the computation of the transmission levels on both the receive and transmit paths, with the circuit impulse response that develops containing the raw data for the calculation of circuit ERL.
		Circuit ERL is an essential factor in network design to prevent feedback; it is also an indication of misaligned amplifiers and terminal equipment.
		Since circuit ERL values are generally too low for the optimum network design and acceptable subjective performance, echo cancellers are installed to provide an enhanced circuit ERL.
	www.findarticles.com /p/articles/mi_m0TLC/is_12_34/ai_68650930 (1342 words)

	Noise News for Week of June 21, 1998
		The noise problem is so complex the committee is taking it on one problem or report at a time, she said.
		Noise and reverberation also can cause voice fatigue among teachers, who have to constantly raise and lower their voices depending on the noise levels in their rooms.
		The article reports the noise suit began in 1987 when a group of 27 area residents sued the airport, claiming loud jets and pollution were harming property values and their quality of life.
	www.nonoise.org /news/1998/jun21.htm (18456 words)

	Noise Canceling Circuit (Site not responding. Last check: 2007-10-20)
		One of the problems of living in a built up area is local noise, this is particularly troublesome at higher frequencies where signals can be heard at a much lower level, where the noise should be much lower.
		Although this worked it was lossy and had low Q. The Q of the tuned circuit should not be too high as the circuit requires to “see” a fairly broad spectrum of noise to work correctly.
		I have not been able to try this circuit on power line noise as there are a lack of them in this area, therefore, I would be interested in feedback from anyone that tries this circuit on any such noise.
	www.qsl.net /g4lna/noisdes.html (532 words)

	Driving Energy Resolution to the Noise Limit in CdZnTe Gamma Detector Arrays
		The detector circuit response is adjusted to a short shape time of a spectroscopy amplifier that overlaps with the build-up period.
		The adjusted detector circuit is not sensitive to hole trapping and the gamma energy resolution is improved to the noise limit.
		The line widths are adjusted to 1, 2, 4, 8% respectively, corresponding to noise level proportional to the square root of the pixel's area.
	urila.tripod.com /pixel.htm (2531 words)

	Low-Noise Design Techniques for Telecommunications
		In general, the noise analysis has been approached in the frequency domain, with the high Q of the circuit resonance filtering noise into a narrow band near the fundamental frequency.
		At the component level, the figure-of-merit is related to fundamental sources of jitter in the oscillator, such as thermal noise and shot noise.
		The ability to traverse several levels of complexity, from system-level performance to circuit- level constraints, is very valuable in the early stages of design when system level power and performance budgets are being roughed out.
	www.vlsi.wpi.edu /lownoise (4576 words)

	That’s impossible
		Thermal noise, the vibration and motion of atoms and molecules caused by the fact that they have a temperature above absolute zero, is indeed a constraint on molecular machine design, but poses no insurmountable (or even conceptually very difficult) challenges.
		The most compact argument showing that thermal noise is not incompatible with the existence of molecular machines is the existence of a vast assortment of biological molecular machines, including the ribosome (which can translate mRNA instructions into proteins), molecular motors, and the like.
		While concerns about thermal noise and quantum effects form the basis for most of the sweeping arguments against the feasibility of molecular machines, a lesser argument is “You can’t provide power.” This argument is seen less often because it is fairly obvious that power does not create a fundamental problem.
	www.zyvex.com /nanotech/impossible.html (3912 words)

	Talk Light Inc Products and Services
		Noise levels can be a loud problem, time management issues can get everyone off track, volume production can be a costly company expense; your answer is as simple as Red – Yellow – Green.
		The Talk Light noise management system can be used in conference rooms, auditoriums, cafeterias, classrooms, hospitals and any other noise sensitive environments.
		The microphone installed in the traffic light is adjustable to monitor noise levels as low as a quiet library and as loud as a jet airplane
	www.talklight.com (163 words)

	[No title]
		This figure of merit is used to relate fundamental circuit-level noise sources (such as thermal and shot noise) to system-level jitter performance.
		The discriminator circuit is a generalized n-port version of the two-port differential charge-sensing amplifier that is conventionally used in DRAM's for bitline sensing.
		Simulation results of the the circuit confirming its theoretical performance are presented, as well as measurements of the implemented chip.
	ece.wpi.edu /~mcneill/papers/papers.html (1537 words)

	Low Noise Balanced Microphone Preamp
		This simple design has very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot.
		The circuit is differential in and out and therefore requires a balanced to unbalanced buffer to give suitable output for the next signal stages of a channel in a mixing desk.
		The input stage is configured for least noise and this has meant a non IC approach.
	sound.westhost.com /project66.htm (1259 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Information about this standard regarding the version adopted and where to obtain it is set forth in WAC 480-120-999.
		Off-premise station circuit loss must not exceed 5.0 dB at 1004 Hz when measured between the customer switch demarcation and the customer station demarcation.
		LECs must meet the availability objectives for digital private line circuit performance specified in the American National Standards for Telecommunications, "Network Performance Parameters for Dedicated Digital Services - Specifications." Information about this standard regarding the version adopted and where to obtain it is set forth in WAC 480-120-999.
	www.leg.wa.gov /wac/index.cfm?fuseaction=section&section=480-120-401 (638 words)

	Noise Tester(NC-16-2) - Tianjin Bohai Radio Factory, Electronic Engineering Department
		The equipment is for monitoring the ambient noise in PA zone, and automatically control the output power of PA system, to keep the broadcast volume higher than the ambient noise.
		Measuring ambient is adopted in noise testing circuit, the equipment is with high common mode rejection ratio, capable to test accurately the exact noise level at each testing point.
		In each PA zone the noise samples are taken from three testing points, and sent to the single chip via AID switch circuit for software comparison process consequently the anti-interference ability of the equipment is improved.
	www.allproducts.com.tw /prc/bheed/04nc.html (228 words)

	Electronic Equipment - How do you detect the broadband noise level?
		noise in planes), noise signals which have an autocorrelation.
		receiver is impulse noise, which consists of a train of large spikes.
		noise of constant amplitude/energy or very slowly changing - as is often the
	www.electronic1.net /detail-1212932.html (1236 words)

	UCSB General Catalog - Electrical and Computer Engineering (Site not responding. Last check: 2007-10-20)
		The graduate programs offer educational opportunities at an advanced level, leading at the M.S. level to increased career opportunities in the foregoing positions, and at the Ph.D. level to careers in research and teaching and positions of professional leadership.
		Immediately upon admission to studies toward the Ph.D. degree, students are required to develop a formal study plan which includes both (1) an appropriate level of coursework and special studies to provide depth of knowledge in a specialty area, and (2) additional coursework in two technical areas that are distinct from the specialty area.
		Circuit noise, signal/noise ratios, digital communication receiver sensitivity.
	www.catalog.ucsb.edu /engineer/ece.htm (9524 words)

	SatelliteGuys.US - 508 acceptable noise level
		The units I checked out at Circuit City andamp; my local dish vendor, did not have these types of sounds.
		Yup that noise is normal, its because the PVR is like your computer, it has a Hard Drive in it that spins (really really fast) inside of it, this is where that whine comes from.
		I would have liked to have kept it, but could not justify the noise when just watching satellite tv.
	www.satelliteguys.us /showthread.php?t=799 (506 words)

	594syllabus (Site not responding. Last check: 2007-10-20)
		High speed digital IC design at the transistor level.
		Circuit noise, signal/noise rations, digital communication receiver sensitivity.
		circuit structures for and / or / xor / latches …
	www.ece.ucsb.edu /~rodwell/Classes/ECE594A/594syllabus.htm (171 words)

	Guyatone Guitar and Bass Effects pedals : Micro Effects NR-2 Noise Reduction (Site not responding. Last check: 2007-10-20)
		One of the most dangerous enemies to a great guitar sound is unwanted line noise.
		Many manufacturers have based their careers on marketing complicated noise reduction units that take up several rack spaces and can cost hundreds of dollars.
		This palm-sized workhorse is incredibly simple to use - Just one knob controls the Threshold level where the noise reduction circuit activates, and one LED tells you when it's at work.
	www.guyatone.com /microeffects/nr2.html (217 words)

	Designfax - Five Star
		An active circuit (ASIC) provides an oscillating electric field to two nearby electrodes, creating an electric field about the cell.
		The detector cells have a high signal-to-noise ratio through the use of high-level signals with a dynamic range of over 3V, and meet FCC/CE requirements with their low pulse amplitude (5V) and low frequency (typically 60 kHz) operation.
		They are available on printed circuit boards or flex circuits for curved substrates.
	www.manufacturingcenter.com /dfx/archives/0104/0104fivestar.asp (661 words)

	Welcome to Red and Blackness Hardware Reviews
		Our Business goal is to provide the best possible customer service along with equal product support in order to keep in good faith with our customer.
		We pride ourselves in customer relations and work extremely hard to achieve and maintain the highest level of customer service and products support.
		Of course having it on high makes a little more noise but not hearable.
	www.rbmods.com /Articles/Vantec/Ion400w/1.php (520 words)

	Circuit noise level -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		Circuit noise level -- Facts, Info, and Encyclopedia article
		Note: The circuit (The amplitude level of the undesired background noise) noise level is usually expressed in dBrn0, signifying the reading of a circuit noise meter, or in dBa0, signifying circuit noise meter reading adjusted to represent an interfering effect under specified conditions.
		Source: from (Click link for more info and facts about Federal Standard 1037C) Federal Standard 1037C and from (Click link for more info and facts about MIL-STD-188) MIL-STD-188
	www.absoluteastronomy.com /encyclopedia/c/ci/circuit_noise_level.htm (80 words)

	Jspice3 Circuit Simulator (Site not responding. Last check: 2007-10-20)
		is a circuit simulator developed to meet the needs of researchers working with superconducting Josephson junction circuits, yet the program has the flexibility and power to meet the needs of other technologies.
		The ac, noise, transfer function, and transient analyses can be performed at every point of a dc sweep using the "loop" analysis mode.
		Jspice3 is supplied as source code which will compile on virtually any unix compatible system.
	www.srware.com /jspice3.html (179 words)

	Tom's Hardware Guide Processors: Lord Kryo Puts His Hands on 17 Coolers - Sound Level - Whistler Or Noise? (Site not responding. Last check: 2007-10-20)
		The noise of a cooler during operation is an important aspect.
		We ran our noise tests in our sound chamber using a sound level meter.
		The noise level is determined in the middle above the CPU cooler at a constant distance.
	www17.tomshardware.com /cpu/00q4/001211/cpu_cooler-06.html (753 words)

	Starkey Sequel Hearing Aids - Hearing Instruments at Discount Prices :: Hearing Planet (Site not responding. Last check: 2007-10-20)
		Starkey Sequel Digital offers digital fidelity with greater multi channel flexibility to compensate for specific hearing requirements.
		Starkey Sequel Hearing Aids now features expansion technology to ensure that circuit noise and low-level environmental noises from ventilation systems and other household appliances do not interfere with the vital speech components critical for maximum audibility.
		New indicator tones for low battery warning, memory switching and volume control settings increase your hearing comfort by making it easier to find the appropriate listening level.
	www.hearingplanet.com /starkey-sequel.html (146 words)

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