emi Definition and Topics - 12 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. harsh22902

    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?
  2. 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...
  3. 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...
  4. 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?
  5. 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?
  6. C

    Impedance and EMI/RFI

    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.
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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)...
  12. 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
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