Sony DVP-M35 Operation Manual page 40

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(2) Tilt offset adjustment minimizing jitter

To optimize RF during DVD playback (excluding search), the jitter (JITTER:time-axis

fluctuation of the RF signal) is measured, offset is added to the tilt servo loop, and the

jitter is minimized.

As jitter is adjusted at shipment, normally this adjustment is not required during playback.

However if the jitter deviates with time, the adjustment value may not be optimum

according to the disc. In such cases, the jitter is measured prior to playback, and if it is

deviated from the specified value, adjustments are started automatically.

The jitter value is measured by IC806 (CXD1865R) and the measured data is sent to

the system controller IC805 (HD6437034) to determine the offset amount. The offset is

voltage-generated by the PWM output of 1006 (DSP), and input to SSI33P3720 @P

as the offset voltage (TIOFS).

By performing the above three types of IC control, the jitter is adjusted to optimum.

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