Error detecting system of video/audio disc player

Details Error detecting system of video/audio disc player Error detecting system of video/audio disc player

1982-06-02

1985-04-23

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

G11B 700

Patent

active

045134081

ABSTRACT:
In a video and/or audio disc information reproducing apparatus in which the video and/or audio information carried on a video and/or audio disc is picked up with a beam of light incident on the disc to trace the record track on the disc, an error detecting system comprising optical means to emit a beam of light for tracing the record track and producing a signal-carrying beam of light carrying signals picked up from the record track, beam-splitting means to split the signal-carrying beam into two component beams, light-sensitive transducer means responsive to the component beams and having at least four discrete light-sensitive surfaces separate from one another across a first junction line parallel with a line tangent to the record track and a second junction line parallel with a line perpendicular to the record track, the transducer means being operative to produce a first error signal representative of the difference between the intensities of light incident on the light-sensitive surfaces separate from each other across the first junction line and a second error representative of the difference between the intensities of the light respectively incident on the light-sensitive surfaces separate across the second junction line.

REFERENCES:
patent: 4051527 (1977-09-01), Braat
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4074314 (1978-02-01), Velzel et al.
patent: 4345321 (1982-08-01), Arquie et al.
patent: 4411500 (1983-10-01), Yonezawa et al.

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