ApplicationNo. 464927 filed on 04/29/1974
US Classes:369/33.01, Specified electrical control signal processing360/72.1, Locating specific areas369/19, CONTROL BY TIMER OR EXTERNAL EXTRANEOUS CONDITION369/231Mechanism responsive to control structure on storage medium sensed by transducer assembly support (e.g., trip device)
ExaminersPrimary: Moffitt, James W.
Assistant: Levy, Stuart S.
AbstractA sound track selector system for a phonograph record player is provided comprising a light emitter and light detecting sensor carried beneath a sound stylus pick-up arm, directing light to the face of a phonograph record and receiving reflected light along axes substantially perpendicular to the record face and substantially parallel to one another as the emitter and sensor scan the record, means connected to the sensor for determining the bands between recorded sound in response to reflected light, and means for controlling the position of the pickup arm in response to preselected portions of the recording in relation to the detection of the unrecorded portions of the record. An optical encoder system is also provided for detecting the peripheral positions of the pickup arm with respect to the phonograph record.