CD Player Structure

1
CD Player Structure

• Optical PickupLaser, Optical pickup, Spindle
  Motor, Traverse Mechanism
• Servo system Tracking, Focus, Traverse, CLC
  (constant linear velocity)
• Error Correction Why required? Missing data
  (scratches, bubbles). How are they detected? CIRC
  (cross interleave Reed-Solomon code)
• A to D/D to A Considerations involve PCM, DSP,
  Sampling ___________, Quantization.

2
CD Player Structure

• Low Pass Filter Purpose? Removes high frequency
  artifacts of digital sampling process.
• System Control Involves microprocessor
  communication with functions and switches to
  relay messages and commands to other parts of the
  system.
• FL display Displays disc data generated from
  subcode embedded within CD protocol frame.

3
Digital Signal Topics Summary

• Quantization
• Sampling rate
• Sample and Hold
• Oversampling
• CIRC (Cross Interleave Reed-Solomon code)
• Interpolation
• EFM (eight to fourteen modulation)
• Aliasing
• Anti aliasing filter (input low pass filter
  encoding)

4
Digital Signal Topics summary

• Output Low Pass filter (decoding)
• CRCC (cyclical redundancy check code)