Patent ID: 6028657
Filing Date: 2000-02-22
Classification: G11B

Abstract:
A reproducing apparatus for a motion picture film having a tracking pattern and an audio data pattern recorded thereon, said apparatus including a device for providing a time varying signal having a tracking pattern portion and an audio data portion by scanning said tracking pattern and audio data comprising:level adjustment means for adjusting the level of the time varying signalfirst sample-and-hold means for sample-holding the level of the tracking pattern portion of the time varying signal;second sample-and-hold means for sample-holding the level of the audio data portion of the time varying signal so as to provide an average signal level associated with the audio data portion;output switching means for outputting the level of the time varying signal sample-held by said first sample-and-hold means or said second sample-and-hold means;control means for controlling output switching of said output switching means so that, if a pre-set waveform of said time varying signal is detected, said output switching means outputs a level from said first sample-and-hold means and, if said pre-set waveform is not detected, said output switching means outputs a level from said second sample-and-hold means; anddifference detection means for detecting a difference between the level outputted from said output switching means and a reference level for controlling said level adjustment means to reduce the difference.