Apparatus for reading optically encoded soundtracks

Details Apparatus for reading optically encoded soundtracks Apparatus for reading optically encoded soundtracks

1991-09-10

1993-07-27

Berman, Jack I.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, 369120, G11B 700

Patent

active

052316270

ABSTRACT:
An apparatus for reading variable area optically encoded soundtracks has a light source, a lens system and a detector. The detector can be a linear array, for example a CCD array, with an integral slit, with the lens system imaging the soundtrack in the plane of the slit. The apparatus includes circuitry for processing the detector output signal. The processing circuitry can be provided with a feedback control circuit to condition the detector output signal so that the resulting audio signal is not affected by variations in the film or electronic components. Further, a circuit can be included for detecting whether an analogue or digital soundtrack is present, and automatically switching the output of an amplification circuit between analogue and digital outputs.

REFERENCES:
patent: 4085296 (1978-04-01), Keegan
patent: 4124784 (1978-11-01), Johnson et al.
patent: 4355383 (1982-10-01), Dolby
patent: 4698787 (1987-10-01), Mukherjee et al.

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