What is Emi: Definition and 39 Discussions

EMI Group Limited (originally an initialism for Electric and Musical Industries, also referred to as EMI Records Ltd. or simply EMI) was a British transnational conglomerate founded in March 1931 in London. At the time of its break-up in 2012, it was the fourth largest business group and record label conglomerate in the music industry, and was one of the "Big Four" record companies (now the "Big Three"). Its labels included EMI Records, Parlophone, Virgin Records, and Capitol Records, which are now owned by other companies.
EMI was listed on the London Stock Exchange, and was also once a constituent of the FTSE 100 Index, but faced financial problems and US$4 billion in debt, leading to its acquisition by Citigroup in February 2011. Citigroup's ownership was temporary, as EMI announced in November 2011 that it would sell its music arm to Vivendi's Universal Music Group for $1.9 billion and its publishing business to a Sony/ATV consortium for around $2.2 billion. Other members of the Sony consortium include the estate of Michael Jackson, the Blackstone Group, and the Abu Dhabi-owned Mubadala Development Company. EMI's locations in the United Kingdom, the United States, and Canada were all disassembled to repay debt, but the primary head office located outside those countries is still functional.EMI is now owned by Sony/ATV Music Publishing, the music publishing division of Sony Music which bought another 70% stake in EMI Music Publishing.

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  1. Muhammad Usman

    How EMI is handled in IC fabrication?

    As i recently came to know that the energy is not travelled in the wire infect it is travelled in the space around the wire in the electrical and magnetic field (thanks to varitasium for his video) so my question is particularly related to the IC fabrication. In IC fabrication we have...
  2. N

    Capacitive and Inductive Coupled EMI model

    I am new to EMI modeling and just looking into it. I would like to create a circuit schematic to represent the inductive and capacitive coupling paths in one schematic. All that I've been able to find online is references discussing each independently. Is this the best approach if you want to...
  3. Ntip

    How Do I Design an EMI Filter for a Converter with Only Voltage and Power Specs?

    I am starting the input filter design for a converter and only have the voltage and power specs. It will be the input filter to other converters on a parallel bus, so I could look at the datasheets for those and get some specs there. I do not have any information from the input converter to this...
  4. Ntip

    EMI Shielding Effectiveness with Various Conductor Thicknesses

    Let's assume that I have have one conductor carrying current to the load in one direction and the return line with current in the opposite direction from the load. If the current has high di/dt due to switching, may have EMI issues with nearby circuits. I know that I can put a "ground" plane on...
  5. harsh22902

    Flux & Physics: Explaining the Constancy of Flux

    This is an excerpt from a high school physics textbook. I don't understand the possible reason behind this statement. If we change something in the circuit say for example add a resistor , the current and hence the flux should change. Then why/how is this statement true?
  6. D

    50Hz 3 Phase Circuit - Twisting to reduce EMI?

    I have done the maths to work out the Induced Voltage on a communication cable, from a bunch of 3 phase circuits in a panel - with the minimum distance between them I calculated it to be about 1.5nV; but for a larger system where there could be larger loads on the cables I was thinking about...
  7. F

    Power line EMI filter + feedthrough filter for a Faraday cage

    Dear forumers, I need a 50hz 250VAC power line filter for an EMI shielding faraday cage. The filter should work between 100khz and 20ghz, attenuation should be >=60dB between 1mhz - 5ghz. Regular power line EMI filters like this don't seem to go that high (only up to a few hundreds of mhz...
  8. J

    EMI Multiple choice question

    Homework Statement More than one options may be correct . Homework EquationsThe Attempt at a Solution [/B] Options a) and c) are correct . But I don't understand how non magnetic metal reacts to the magnetic field . Is it in some way related to ferromagnetism ? But then either both b)...
  9. C

    Dirty electricity and EMI filter

    Does EMI filter still work if you live near a base station which produces dirty electricity? Or EMI filter only filter the dirty electricity which would have been generated from your power circuit if w/o EMI filter?
  10. Nikhil N

    What could be the ratings of inductor used?

    I have a circuit which can produce bursts of 500V. When I did this circuit, The 2.2 mH is burning. I want to know whether do we need to take care the power rating of inductor? After the test I tried the experiment without inductor too. I have used 2.2ohm, 1W resistor. That too started to burn...
  11. Nikhil N

    Noise due to chattering of relay

    I need to know how to couple noise due to chattering of relay? I have seen the below method to couple. But I want more detailed circuit to do this. Please help me. Also I want to know where the tremendous amount of EMI can be seen ? Is it across the coil of relay?
  12. Planobilly

    How do I shield an amp setting on my work bench from EMI

    Hi, With all the various RF coming from things in my own house (cell phones, TV, cable modem, electric motors, etc.) and from outside I need to try to limit that interference while working on amps. Disregard for the moment, interference coming in through the AC mains. I also want to explore...
  13. Nikhil N

    How to test CST design studio for analyzing data errors

    Hi.. I want to know how can we specify the data(electrical) passing through cable that we are designing in CST design studio to test the effect of EMI on the data passing?
  14. Mausam

    EMI potential difference question

    This is not a homework.i am not able to understand rotating motional emf .so could u please tell why could we use the effective length to calculate emf in this case .
  15. K

    What could have caused an EMI Filter Bead shorted by itself?

    Hi, I am a Reliability Engineer. Currently, I am facing difficulties in finding the root cause to a defective EMI filter bead. Resistance measurements across the four leads (vertically, horizontally, diagonally) show that they are all shorted. However, a good ferrite bead should only be...
  16. S

    Using a computer to detect EMI?

    Hi all, I was wondering if a computer could be use to monitor the EMI on a house power line ? I have read a few papers on the subject, all of which proposing all sorts of devices, but I was wondering if it could be done directly by prompting a computer to monitor the electric flow through...
  17. C

    Understanding Low Impedance & EMI/RFI in Audio

    Question in relation to audio. I read online that a low impedance system is less susceptible to EMI and RFI than high impedance. How? I thought that high impedance = high resistance, therefore higher resistance to EMI and RFI. Would love to be updated with the explanation. Thanks.
  18. G

    I'm curious about radiation effect from high speed cpu

    Hello. We're in the age of the high speed computation. Personal computer clock speed is on the order of GHz and scientist looks for a way to raise the speed up to THz class. I've read this from newspaper and got some question. I've learned in class that radiation effect becomes severe as...
  19. Cookiey

    Induced Emf due to changing magnetic flux

    If we have a conducting loop, and a magnet (say North pole first) is pushed into it; that induces and emf and hence a current in the coil due to the changing magnetic flux, right? According to Lenz' law, the direction of the current is such that it opposes the change. So from the side the magnet...
  20. G

    Question for grounding of the electronics to Faraday cage

    Hello. Let's say there is a instrument needed to be EM wave-shielded in High voltage discharge lab. Building Faraday cage becomes necessary and the instrument is moved to inside the cage. The cage is grounded to lab ground and the frame ground of the instrument (it is also signal ground for the...
  21. K

    Basic faraday cage questions

    I hit a 1:40 ratio pulse transformer with a 1000V (100mA) sawtooth pulse and it creates a spark gap. Unfortunately it also creates a lot of EMI and my micro-controller and power supply has problems because of it. How do I stop this? How do I know what the wavelength is of the EMI field so I...
  22. Krack

    Shielding & ground loop for audio

    I have a 3 conductor wire that are all wrapped in a foil shield with wire conductor, for a total of 4 wires. I am connecting the 3 inside wires to audio left, right, and ground. This is an unbalanced setup, right? Where/how do I connect the shielding? Do I connect both sides (i think no)...
  23. copper-head

    Testing the quality of twisted pairs

    Hello all. I was wondering if there is a method or a device to check the quality of the twists on twisted pairs cable harness vis-a-vis EMI. i.e. someway (to tell is the twists are good enough to pass EMI testing). Cheers
  24. hxtasy

    How to purposely INDUCE EMI, noise, et cetera? drill? phone?

    how to purposely INDUCE EMI, noise, et cetera?? drill? phone? troubleshooting a GPU server, it has a card in it that generates a 20-100 MHz clock signal that goes to the actual GPU. Have worked on several of these units, when they fail the gpu doesn't get the clock signal so there is no VGA...
  25. C

    Solving OP Amp & EMI Problems - Joe's Experience

    I have a temperature probe that I amplify with an OP amp and the circuit has to sit next to a video transmitter operating at 1280 MHz outputting ~ 800 mW of power. I can get the circuit about a meter from the transmitter if I absolutely have to but it is going to be in somewhat close...
  26. P

    Electromagnetic Induction (EMI)

    A non conducting ring of mass m and radius R has a charge Q uniformly distributed over its circumference. This ring is placed on a rough horizontal surface such that the plane of the ring is parallel to the surface. A vertical magnetic field B=B0t2 τ is switched on. After 2 second from switching...
  27. I

    Surge protector for EMI protection in place of EMI filter

    can i use surge protector for EMI protection inplace of EMI filter?what the difference between them?
  28. C

    EMI - Current in solenoid due to magnet

    Homework Statement The Attempt at a Solution Suppose that N pole of magnet is facing the solenoid considering view from magnet when the magnet moves close ... current is anticlockwise and increase from 0 to max till magnet reach starting of solenoid when it enters the solenoid ...
  29. C

    EMI - current direction in loop

    Homework Statement The Attempt at a Solution I think that both i1 and i2 will have same mag and direction and at same time the loop is not closed so will there be any current?
  30. C

    EMI Quickies: Get Answers to Your Questions

    #1 No idea. #2 Please someone explain me the question. From what I have understood, I think it’s because on connecting wires, it will form a closed loop and will induce an opposing EMF which will induce current in circuit and which will provide an opposing torque to the motion. #3 Yes...
  31. C

    EMI - voltage across Inductor

    Homework Statement suppose there is a inductor connected to a battery and resistor in series ... i need to find the current in circuit at some time t i suppose i could use Kirchhoff's loop law but i don't know weather to take potential across inductor (L di/dt) as positive or negative. i...
  32. M

    What is the Current in a Circuit with a Newly Introduced Inductor?

    Homework Statement A circuit has an inductor of self inductance 5L connected in series with a resistor of resistance R and a cell of emf E. After a long time, a new inductor of inductance 4L is suddenly connected in series to the arrangement, keeping the rest of the arrangement intact. What...
  33. Topher925

    Are thermocouples not affect by EMI?

    Are thermocouples not effected by EMI? I've been reading a lot of papers lately about temperature measurement. Most them involve temperature measurement in electrochemical devices such as batteries and fuel cells. Using micro-thermocouples seems to be common practice but this makes absolutely...
  34. J

    EMI - induced current on two parallel wire

    I would like to quantify the EMI on a circuit and I am confused on how to do that. I have two parallel wires that are laying on top of each other. I have tried to calculate the flux linkage and came up with: \Lambda = [l*\muo*I/(2pi)]*ln((d-a)/a) where a=radius of each wire...
  35. W

    Why is there EMI and vice versa

    (1)why is magnetic field generated when current is passed through a conductor? :confused: (2)why is current induced in a conductor by change in magnetic flux? :zzz:
  36. A

    Is It Incorrect to Use ∫E . dr in a Moving Conductor?

    Using Faraday's law for a closed loop we say that the EMI is -d(phi)/dt .Now this emf is induced in the closed loop...So between which two points is the PD equal to -d(phi)/dt Thanks
  37. S

    Can Replacing Chip EMI Filter Capacitors Improve Attenuation Characteristics?

    I have some chip emi filter capacitor type. Its parameters are size 0603 , 1000pF , tollerance +/-20%. I would like to replace it by filter of another vendor, with the difference of tollerance -20/+50%. As I'm understanding from attenuation characteristics chart, the replacement maybe even...
  38. G

    EMI Shielding Gaskets: Function & Applications

    Hello everyone, Can anybody tell me that, actually what is the main function of EMI shielding gaskets?And i would also like to know the applications of EMI shielding gaskets. Best regards
  39. T

    How can electrostatic discharge affect helicopters and their onboard equipment?

    Hi What kind of problems ESD can cause to a helicopter? Blades are usually made from a carbonfibre and they can cause electrostatic charge into a helicopter structure. Is there any method to prevent that to happen? If that charging occurs, what happens when heli is landing, will it discharge...
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