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How does anti skip work on my cd walkman??

Discussion in 'Hardware' started by Marvales, Sep 10, 2003.

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  1. Marvales

    Marvales Thread Starter

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    I know that it involves memory, but what are the specifics? Could it be applied to other things like a dvd player?
     
  2. Wet Chicken

    Wet Chicken

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    This is generally a computer forum, not sure where walkmans fit in ;)

    What kind of specifics are you looking for. The head reads the CD and sends the data to memory where you hear it from. Many laptops use this same general idea for when they go into sleep mode. Instead of memory it sends it to the HD.
     
  3. Marvales

    Marvales Thread Starter

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    could you make a dvd player that works the same way
     
  4. Spyd

    Spyd

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    The anti-skip technology works reading the audio-cd faster than real time and storing the audio data in a memory buffer, from it's played at normal speed. If the buffer is full, and you shock the CD, the laser lens jumps and while it seeks the point where it jumped, the audio doesn't stop, because it's playing from the already full buffer. When the laser lens reads again, it refills the buffer. If you shock the player, but not enough to drain empty the buffer, you won't notice that the player actually stops reading.

    The same principe can be applied to a DVD player, but the amount of data required to play a MPEG-2 stream (the data in the DVD-Video discs) is enormous that makes this sistem expensive.

    The car CD and DVD players also usually came with enhaced suspension systems, that absorbs shocks. Only if the shock is too great to be absorbed by the suspension system the buffer-anti-shock system plays its role (if the player have it)
     
  5. Marvales

    Marvales Thread Starter

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    how expensive? say i wanted a dvd player with about 5-10 seconds of memory, how much would it cost to produce one unit? also, what kind of memory is used - ram, flash,etc??
     
  6. zeddy

    zeddy

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    Solid state memory - ram could be used. With memory prices there are moves to replace current hard drive technology with solid state memory as it does not have moving parts as such and so would not suffer wear and tear as a hard drive does - also the access times would be phenomenally fast.

    In terms of costs ? no idea!!!!
     
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