Reproducing apparatus for reproducing motion picture film

Details Reproducing apparatus for reproducing motion picture film Reproducing apparatus for reproducing motion picture film

1998-02-20

2000-02-22

Adams, Russell

Optics: motion pictures

With sound accompaniment

Methods

352 26, G03B 3100

Patent

active

060286571

ABSTRACT:
A motion picture film reproducing device for reading out a tracking pattern recorded on the motion picture film and reading out audio data, after tracking control, for reproducing RF signals. The signal level of a tracking pattern portion of RF signals outputted by a voltage-controlled variable gain amplifier (VCA) 11 adapted fro adjusting the RF signal level is sample-held by a first sample-and-hold (S/H) circuit 13. The average signal level of the audio data portion of the RF signals is sample-held by a second sample-and-hold (S/H) circuit 16 via a low-pass filter made up of a resister 14 and a capacitor 15. A difference detection circuit 18, supplied via a changeover switch 17 with the sample-held output of the first sample-and-hold circuit 13 or the second S/H circuit 16, detects the difference between the signal level of the sample-held output and a pre-set signal level for controlling the VCA for decreasing the detected difference.

REFERENCES:
patent: 5508761 (1996-04-01), Saito et al.
patent: 5757465 (1998-05-01), Seagrave et al.

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