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Was:audio opamp, LM4562 plots

Discussion in 'Electronic Design' started by Martin Griffith, Sep 3, 2007.

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  1. Eeyore

    Eeyore Guest

  2. Guest

    For some audio freaks, it is. Some of the golden-eared boys do seem to
    be hear these levels of distortion and identify it as a problem. Back
    around 1990, J. Robert Stuart of Meridian managed to persuade Brian
    Moore - one of the U.K.'s better psychoacousticians - that such levels
    of distortion can be audible
    That may be your opinion. It doesn't seem to be widely shared.
     
  3. Phil Allison

    Phil Allison Guest

    " Graham Stevenson = Lying, Autistic Pile of Pommy SHIT"



    ** Hypocrite - moi ???????


    ROTFLMFAO !!!!!!!!!!!!!!!!







    ....... Phil
     
  4. Just been looking at some Cirrus ADC/DACs, CS4351,CS5341 ( great part
    numbers for dyslexics, not)

    They don't even plot the THD performance anymore


    Martin
     
  5. Eeyore

    Eeyore Guest

    Considering that it's rare to obtain background noise levels of even say 20dB
    SPL in purpose designed studios, a signal would have to be of amplitude 120dB
    SPL for a -100dB component to be audible above the wideband 20dB SPL noise
    floor.

    Quite frankly, the ear's performance is so massively degraded at such SPLs that
    I find such a postulation frankly quite ridiculous.

    I have my reasons.

    Graham
     
  6. Eeyore

    Eeyore Guest

    Maybe it's below the noise (measurement) floor ? Just a thought. Wouldn't
    entirely surprise me.

    Graham
     
  7. Winfield

    Winfield Guest

    I can't judge on the golden-ear argument, but I do know that
    we all posses an excellent ability to hear sounds far below
    the noise floor. This is because we easily hear specific
    weak sounds distinct from say broadband white or pink noise
    or other much louder background sounds at other frequencies.
    A hair cell's responding ability is independent from the rest.
     
  8. Eeyore

    Eeyore Guest

    Certainly 'pure tones' 10dB below the *wideband* noise floor figure. Maybe even
    15 - 20 dB below for an experienced listener but ONLY under conditions of near
    'silence'.

    It goes to hell once a large signal is present because of masking.

    Graham
     
  9. Phil Allison

    Phil Allison Guest

    "Winfield"

    ** Got SFA to do with THD figures, though, since the original signal is
    still there - massively masking low level harmonic or IM residual from
    human perception.

    At -100 dB, such residuals would be totally inaudible, even if reproduced
    on their own, in a normal listening room acoustic ambient ( compared to
    normal program level).

    BTW:

    To appreciate Doug Self's technical point re THD in his " Elements of
    Op-Amp Design " page - you must follow the context - all of it.

    Discover what his " blameless amplifier " concept is all about.

    Apply that to IC op-amps, and it may just dawn on you.

    Shame about the genetically dim donkey brains that infests this NG.

    Like Graham Stevenson.




    ........ Phil
     
  10. Eeyore

    Eeyore Guest

    His " blameless amplifier " is a POS. He simply ignores its obvious design
    failings because he's a charlatan.

    Graham
     
  11. Phil Allison

    Phil Allison Guest

    " Graham Stevenson = Lying, Autistic Pile of Pommy SHIT "


    ** Hypocrite - moi ???????

    ROTFLMFAO !!!!!!!!!!!!!!!!


    This LUNATIC needs a slug in the head.




    ...... . Phil
     
  12. Phil Allison

    Phil Allison Guest

    "Eeysore the Posting Pommy Nutter "

    ** Utter nonsense.

    You missed the crucial word " concept"

    - cos you are totally manic & quite insane.



    ** No *YOU* are a classic example of a charlatan - Graham.

    A constant pretender to expert knowledge and insights you simply do not
    have.

    While in reality a truly pathetic case, someone seriously mentally ill and a
    useless pimple on the bum of society.


    Because Doug Self won a position ( many years ago ) that you naively
    imagined YOU deserved - you are now insanely JEALOUS of him.

    How pathetic.

    Hell hath no fury like a manic narcissist scorned.

    Mr Self would be highly amused at your peeved teenage schoolgirl mentality.

    Cos he regularly pisses on poseurs like you from a very great height.





    ....... Phil
     
  13. Eeyore

    Eeyore Guest

    Yes darling !

    Now roll over and go to sleep will you ?

    Graham
     
  14. Phil Allison

    Phil Allison Guest

    "Eeysore the Posturing Pommy Nutter "

    ** Utter nonsense.

    You missed the crucial word " concept"

    - cos you are totally manic & quite insane.



    ** No *YOU* are a classic example of a charlatan - Graham.

    A constant pretender to expert knowledge and insights you simply do not
    have.

    While in reality a truly pathetic case, someone seriously mentally ill and a
    useless pimple on the bum of society.


    Because Doug Self won a position ( many years ago ) that you naively
    imagined YOU deserved - you are now insanely JEALOUS of him.

    How pathetic.

    Hell hath no fury like a manic narcissist scorned.

    Mr Self would be highly amused at your peeved teenage schoolgirl mentality.

    Cos he regularly pisses on poseurs like you from a very great height.


    ROTFL !!!!!!



    ....... Phil
     
  15. Eeyore

    Eeyore Guest

    Whereas you missed the meaning of 'blameless' it seems. His design is anything
    BUT blameless. Indeed it embodies some inherent horrible flaws (like crossover
    distortion) that he chooses to 'sweep under the carpet'.

    Graham
     
  16. Eeyore

    Eeyore Guest

    I see the record's stuck again.

    You really are quite pathetic Phil.

    Graham
     
  17. Phil Allison

    Phil Allison Guest

    "Eeysore the Posturing Pommy Nutter "

    ** Utter nonsense.

    You missed the crucial word " concept"

    - cos you are totally manic & quite insane.


    ** No *YOU* are a classic example of a charlatan - Graham.

    A constant pretender to expert knowledge and insights you simply do not
    have.

    While in reality a truly pathetic case, someone seriously mentally ill and a
    useless pimple on the bum of society.


    Because Doug Self won a position ( many years ago ) that you naively
    imagined YOU deserved - you are now insanely JEALOUS of him.

    How pathetic.

    Hell hath no fury like a manic narcissist scorned.

    Mr Self would be highly amused at your peeved teenage schoolgirl mentality.

    Cos he regularly pisses on poseurs like you from a very great height.

    LOL





    ....... Phil
     
  18. Phil Allison

    Phil Allison Guest

    "Eeysore the Posturing Pommy Nutter "

    ** Utter nonsense.

    You missed the crucial word " concept" - cos you are totally

    MANIC & quite INSANE.



    ** No *YOU* are a classic example of a charlatan - Graham.

    A constant pretender to expert knowledge and insights you simply do not
    have.

    While in reality a truly pathetic case, someone seriously mentally ill and a
    useless pimple on the bum of society.


    Because Doug Self won a position ( many years ago ) that you naively
    imagined YOU deserved - you are now insanely JEALOUS of him.

    How pathetic !!!!

    Hell hath no fury like a * manic narcissist scorned * .

    Mr Self would be most highly amused at your peeved teenage schoolgirl
    mentality.

    Cos he regularly pisses on deluded poseurs like you from a very great
    height.

    ROTFL




    ....... Phil
     
  19. John Larkin

    John Larkin Guest

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