An optical transducer system reproduces a videodisk record by rotating the disc at a low speed. A record guiding means is comprised of a... Show moreAn optical transducer system reproduces a videodisk record by rotating the disc at a low speed. A record guiding means is comprised of a ribbed gate region. The ribs engage the disc on opposite margins of the optical images recorded on the disc and extend in a circumferential direction. Sponsorship: IIT Research Institute United States Patent Show less
In the disclosed embodiments the video signal is recorded on successive longitudinal tracks with high frequency bias. The sound may be... Show moreIn the disclosed embodiments the video signal is recorded on successive longitudinal tracks with high frequency bias. The sound may be recorded transversely on adjacent tracks or may be recorded with the video as pulse modulation in the horizontal blanking intervals. The video bias frequency is selected so as to avoid beat notes with the video signal. The horizontal and vertical sync signals may be amplified separate from the composite video and then added thereto so as to record sync signals of increased amplitude. The picture signal from a television receiver may be recorded without further amplification. Sponsorship: IIT Research Institute United States Patent Show less
In one exemplary embodiment errors due to tape flutter are overcome by recording along with the analog signal clock pulses having a rate... Show moreIn one exemplary embodiment errors due to tape flutter are overcome by recording along with the analog signal clock pulses having a rate sufficient for sampling of the highest frequency component of the analog signal. Then on playback, the reproduced clock pulses control sampling and storage of samples of the reproduced analog signal. By reading out the samples from storage at a uniform clock rate, the effect of flutter on the reproduced signal is eliminated. In another example the recorded clock rate overcomes tape skew and other mechanical irregularities in recording and reproducing multiplexed analog or digital data. Sponsorship: IIT Research Institute United States Patent Show less
A magnetic tape transducing machine with integral head cleaning brush, head demagnetizer and bulk tape demagnetizer, for selective... Show moreA magnetic tape transducing machine with integral head cleaning brush, head demagnetizer and bulk tape demagnetizer, for selective conditioning of the head and tape alternately with actual transducing operations. The brush preferably rotates on an axis oblique to the direction of tape travel across the head while being relatively translated in said direction during contact with the head. Sponsorship: IIT Research Institute United States Patent Show less
