How does a record player recover stereo?

Discussion in 'Electronic Basics' started by Jacobe Hazzard, Jul 11, 2003.

  1. With vinyl records, a needle travels through grooves cut into the vinyl. The
    travel is converted to an electrical signal via the piezoelectric effect or
    some other microphonic pickup attached to the needle.

    How is it that with one needle only, one is able to reproduce a stereo
    signal from vinyl?

    Adam
     
    Jacobe Hazzard, Jul 11, 2003
    #1
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  2. One channel is encoded in the movement 45 degrees from vertical to one
    side, and one channel is encoded in movement 45 degrees from vertical
    to the other side. If you were miniaturized, and traveling down the
    grove as if you were the tip of the diamond, you would experience
    motion up and right to down and left for one channel, and down and
    right to up and left for the other channel. A mono recording encodes
    a single channel by pure side to side motion, which produces equal and
    in phase signals from the two stereo channels.
     
    John Popelish, Jul 11, 2003
    #2
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  3. Jacobe Hazzard

    John Larkin Guest

    Picture a v-shaped groove. One wall moves to encode one channel, and
    the other side codes the opposite channel. The pickup separates the
    orthogonal motions into separate electrical signals.

    John
     
    John Larkin, Jul 11, 2003
    #3
  4. Jacobe Hazzard

    paul s Guest

    Horizontal and vertical movement of the stylus 'needle'. together with two
    transducers.

    Gives the history of stereo vinyl and how it works:
    http://www.badenhausen.com/VSR_History.htm
     
    paul s, Jul 11, 2003
    #4
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