U.S. Philips Corporation

Other

Jan August Hofman

Sing L Tan

Leendert J Van De Polder

Marinus Cornelis Van Buul

A stabilization aid for a vehicle- or vessel-borne search unit comprises two servomechanisms for stabilizing the observation part (3) of the search unit about two mutually perpendicular axes (S.sub.1 and S.sub.2) mounted on the part of the search unit which rotates about the search axis (1). The stabilization aid comprises a computer (7) for determining, from the instantaneous angle of inclination (.alpha.) of the platform (2) supporting the search unit with respect to an earth-fixed reference axis and the instantaneous angular position (B) of the search unit about the search axis (1), measured in the plane of the platform (2), input signals for the servomechanisms. A portion of these input signals are compensating signals for the control errors in the servomechanisms. The principal causes of the control errors are the disturbing torques arising through the non-uniformity in the search motion and the rotational velocity of each of the stators with respect to the rotors of the servomechanism motors on their axes.

Stabilization aid for a vehicle-or vessel-borne search unit

When the information of a continuous-motion video record is displayed in the stop-motion mode by repeated display of two fields which form an interlaced picture, motion in the scene gives rise to a frame-frequency flicker phenomenon in the stop-motion picture. By forming suitable video signal combinations in discrete groups which each comprise two associated fields and by recording these combinations in the video record, the flicker phenomenon in a stop-motion picture is eliminated without continuous display being perceptibly affected.

Method of, and apparatus for, manufacturing a video record

A vertical aperture correction circuit for television in which two cheap narrow-band delay circuits are used for giving a line period delay by means of signal modulation. High-frequency video information is applied through a highpass filter to an adder stage to which furthermore the low-frequency video information delayed over one line period and the aperture correction signal are applied. The highpass filter may be formed with a third narrow-band delay circuit as a bandpass filter.

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Eindhoven, Netherlands

Jan August Hofman