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Servo data decoder for any amplitude dependent servo data encoding scheme

  • US 4,740,736 A
  • Filed: 07/10/1986
  • Issued: 04/26/1988
  • Est. Priority Date: 07/10/1986
  • Status: Expired due to Term
First Claim
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1. A decoder for servo data encoded with any amplitude dependent servo data encoding scheme comprising:

  • means for creating one or more timing windows synchronized to appear at the same predetermined times in every frame of servo data and to sample the amplitudes of one or more servo data pulses which occur during said timing windows and to generate one or more position error signals from the amplitudes so sampled; and

    means for processing said position error signals or signals to generate a gated position error signal having predetermined characteristics and a velocity and a track crossing signal therefrom;

    wherein said means for creating timing windows includes a phase locked loop and means for synchronizing the frequency of said phase locked loop which defines the times of occurrence of said timing windows with the occurrence of synchronizing pulses encoded in said servo data.

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