Abstract: A brightness signal distortion correction circuit (8, 11, 21) is provided for a video recorder, having distortion correction circuit (11), responsive to frequency-modulated brightness signals, and further responsive to feedback disturbance recognition control signals (U, J), for providing distortion corrected brightness signals; and also having disturbance recognition circuit (21), responsive to the distortion corrected brightness signals, for providing the feedback disturbance recognition control signals (U, J). In one embodiment, the distortion correction circuit (11) includes an adjustable transmission circuit (8) being arranged between the distortion correction circuit (11) and the disturbance recognition circuit (21), and having a voltage divider circuit (50, 51) including a resistor (51) and first and second diode circuit (50), responsive to the disturbance recognition control signals (J).

Abstract: A video recorder for recording and reproducing video signals having a bandwidth with a limited upper transmission frequency, including HDTV signals. A recording signal processing circuit (14) with a first scanning circuit (10.1) for scanning the video signal to be recorded with first scanning recording pulses of a first scanning frequency that is at least equal to the limited upper transmission frequency, for providing the first recording signal (AS1), and a second scanning circuit (10.2) for scanning the video signal to be recorded with second scanning recording pulses that are displaced through half a cycle with respect to the first scanning pulses of the first scanning circuit (10.1), and having a second scanning frequency equal to the first scanning frequency, for providing the second recording signal (AS2). A recording/playback circuit (15, 16) includes recording-reproducing heads (11.1, 11.

Abstract: The invention concerns a method of determining the angle of attack (pretilt angle) of liquid crystal molecules in a liquid crystal display (LCD) provided with top and bottom cover plates. The following steps are proposed for a simple and cheap determination: addition of a dichroic dye (17) to the liquid crystal (5) in order to cause the dye molecules (18) to become aligned by the crystal molecules (6), which are present in a twist-free state, determination by measurement of a maximum absorption value, the said measurement being carried out by causing a polarized ray of light (19) (measuring ray) to pass through the liquid crystal display (1) and varying its angle of inclination (.alpha.) with respect to the plane of the cover plates (2,3), and then using the angle of inclination (.alpha.) associated with the maximum absorption for determining the angle of attack (.delta.).

Abstract: A device for recording FM signals in helical-scan tracks of a video magnetic tape has a phase shifter disposed between an FM modulator and a write-head configuration, which subjects the FM signal from the FM modulator to a phase shift. The phase shifter determines a phase shift for a luminance signal which is determined by a first phase shift P1 for a line n of a track m; a second phase shift P2 for a line n+1 of the track m; and a third phase shift P3 for the line n located in the track m+1. For the line n+1 located in the track m+1, a fourth phase shift P4 has a value determined by the other three phase shifts such that a total phase difference D between a first phase difference D1 of the fourth and the second phase shifts (D1=P4-P2) and a second phase difference D2 of the third and first phase shifts (D2=P3-P1) measures 180.degree. (D=D1-D2=180.degree.

Abstract: The invention specifies a calotte-type (encased) loudspeaker distinguished by very small dimensions. The pot magnet (12) is joined to a single-piece case component (11) exclusively by means of elastic snap catches (32) such that a terminal locking hook (35) forming an integral part of the said snap catches (32) engages with a collar (25) arranged on the pot magnet (12). After the case component (11) and the pot magnet (12) have been joined together, the membrane (21) is kept in position between the case component (11) and the pot magnet (12) exclusively by virtue of the fact that the part of the membrane (21) that bears against the pot magnet (12) is pressed against the said pot magnet (12) by the free end (29) of the piece of tubing (28) attached to the case component (11).

Abstract: To prevent the formation of a corona (2) in a known in-line color picture tube with an automatic-focusing deflection system and four grids (G1-G4), a rectangular opening is provided on the side of the second grid (G2) facing the first grid (G1). As a result, the luminous spot (1) formed by the electron beam at the center of the screen is converted to a vertical ellipse and the ratio of the axes of the lateral ellipses on the edge of the image is reduced, thus improving the sharpness of the edges. The openings (5) in the first grid (G1) are elongated in the in-line direction, in particular rectangular, the adjacent openings of the second grid (G2) are also rectangular and all the other openings in the other grids (G2, G3, G4) are circular. In this way, the ratio of the axes of the luminous elliptical spot (11) produced by the electron beam at the center of the screen is reduced without adversely affecting the sharpness of the edges.

Abstract: A method of producing a substrate plate for a liquid crystal cell with black matrix areas in which blackened polymer material is already deposited before the structured areas of photosensitive resist overlying the structured electrode areas are removed. Rather, these structured areas of photosensitive resist are removed only after the blackened polymer material has been hardened.This processing sequence has the advantage that no special alignment processes are needed in order to arrange the black matrix areas accurately between the electrode areas.

Abstract: In a process for applying orientation layers to cell plates (11.o, 11.u), the cell plates are arranged in relation to a centrifuge rotational axis (14) so that the plate planes lie parallel to the rotational axis. The centrifugal forces then act over the entire plate surfaces in the same direction in each case. This leads to a homogeneous pre-alignment of the orientation layer molecules.Because a homogeneous pre-alignment of orientation layer molecules can be achieved with this process, an improved orientation effect can be obtained.