Abstract: A braking device for a tape player/recorder includes a pair of reel platters and a pair of pivotable brake arms individually supporting brake pads. A tension member biases the brake pads against the reel platters in a brake-applied position. The brake arms have extensions extending to a selected point. A spring biased pivotable lever arm includes a tracking end and an actuating end. The actuating end engages the brake arms at the selected point to bias the brake pads away from the reel platters against the action of the tension member in a brake-released position. A lifting element is coaxial with a motor driven shaft and includes a helical ramp extending around the lifting element and rising from a lower level to a higher level. An adjusting element is coaxial with the shaft and is outside of the lifting element. The adjusting element includes lower and higher faces respectively coincident with the lower and higher levels of the ramp.

Abstract: A signal regenerator for binary signals includes a signal equalizer having an input filter and an integrator. An amplitude detector and a period detector are arranged to receive the output signal of the equalizer. A high pass filter is included in a feedback loop to feed the output signal of one of the detectors back to the equalizer.

Abstract: A turntable for disc-shaped records includes a disc-centering hub for engaging a centering aperture in the disc-shaped record. A bushing is coaxial with the disc-centering hub and connects the turntable to a driving mechanism. A circular part connects the bushing to an annular outer bearing surface. The annular outer bearing surface has a step portion forming a shoulder normal to the bearing surface and imbedded in the edge of the circular part. The shoulder rises above the circular part to support the disc-shaped records above the circular part by the hub and the bearing surface.

Abstract: A deflection method and circuit for symmetrical horizontal scanning in a television tube utilizes a vertical deflection coil and an auxiliary vertical deflection coil. The vertical deflection coil is energized with a sawtooth vertical scanning current having a first slope during vertical trace to generate a first vertical deflection field. The auxiliary vertical deflection coil is energized with a sawtooth vertical auxiliary current having a line frequency and a second slope during horizontal trace equal but opposite to the first slope of the vertical scanning current to generate a second vertical deflection field. The first and second vertical deflection fields are superimposed in the tube to produce a stepped vertical deflection field.

Abstract: A high voltage transformer for a television receiver includes a primary winding and a secondary winding. The secondary winding is compartmentalized and is separated from the primary winding by a space. The secondary winding has a plurality of partial windings which are arranged in cells of a compartmentalized coil form and are connected to one another by diodes. The partial windings are positioned and dimensioned with respect to the primary winding to cause substantially equal pulse voltages of like polarity to exist at the neighboring portions of the primary winding and the partial windings in the vicinity of the space, to substantially eliminate pulse electric fields in the space.

Abstract: An optical scanning device includes an object lens for focusing a light beam onto a recorded medium having a helical data track. A tracking regulation circuit guides the object lens along the data track. The tracking regulation circuit includes a coarse drive circuit for driving the optical scanning device and a fine drive circuit for adjusting the object lens. The optical scanning device and the object lens have optical axes which normally are aligned. Deviations of the optical axes from alignment are measured and regulation signals are generated for the coarse drive circuit in accordance with the deviations.

Abstract: A printed circuit board includes an oscillator and a modulator. The oscillator includes a first printed inductor and a capacitive diode which are printed on one side of the printed circuit board. The modulator includes a second printed inductor coupled to the first printed inductor and printed on the same side of the printed circuit board as the oscillator. A conductive surface at a reference potential is arranged the other side of the printed circuit board and in the vicinity of the oscillator and the modulator and electrically coupled to the oscillator and the modulator using conductive through holes.

Abstract: A sample rate converter includes a first interpolator which generates samples intermediate samples provided at a first sample rate. A second interpolator, using the intermediate samples, generates further samples at a second sample rate which are intermediate the intermediate samples. An accumulator which accumulates a value representing the ratio of the first and second sample rates, generates scale factors for performing the interpolations, and a clock signal at the second sample rate.

Abstract: In an optical recording apparatus light is directed to and reflected from a recording medium to recover recorded information. The intensity of direct and reflected light is measured and the ratio of the measured values is used to control the intensity of the light source to maintain the intensity of reflected light substantially constant.

Abstract: It is the object to create a vertical deflection circuit which is suitable, in particular, for a symmetric deflection with a sinusoidal deflection current and a free-running horizontal deflection circuit not synchronised by the input signal.A vertical pulse derived from the received signal and a horizontal pulse (H*) derived from the horizontal deflection circuit are applied to the synchronising inputs of the vertical deflection circuit in such a manner that the vertical deflection in each case begins with the first horizontal pulse following an edge of the vertical pulse (V) derived from the received signal and ends in a wait position preceding the next vertical pulse (V).Suitable, in particular, for television receivers with a symmetric free-running horizontal deflection not synchronised by the input signal.

Abstract: In optical playback appliances, such as CD-players, the objective lens sits on a lens-holder that is mounted so as to swivel around an axis and that carries at least one coil. The axis of rotation of the lens-holder is secured to a housing. To allow the lens-holder (LH) to move easily, without being hampered by wires, in the optical scanning device, essentially composed of the lens-holder (LH) and the housing (G), the current required for the coils (S1, S2) flows through respective elastic, electroconductive fastening elements (FO, FU) to both ends (SO, SU) of the axis (N), and from said ends (SO, SU), electrically isolated from each other, to the coils (S1, S2), via respective strip conductors (LPO, LBU) on the lens-holder (LH). This optical scanning device with a lens-holder is useful in CD-players, video disk players, DRAW-disk players and in magneto-optical recorders and players.

Abstract: In an MPEG multi-channel audio signal processor, a decoder requires a respective decoder matrix for determining different output channels from coded audio data. Some transmitted information indicates basic parameters of the multi-channel system. This information may be used to address a currently required decoder matrix which is stored in a decoder memory. The storage of a large number of such matrices would be required to enable the decoder to decode all possible channel configurations. Instead of addressing a required decoder matrix stored in decoder memory, initially the current encoder matrix is reconstructed in the decoder using the related transmitted information. The required decoder matrix is then computed from the reconstructed encoder matrix using a matrix inversion technique.

Abstract: A high voltage transformer for a television receiver includes a coil former supporting a primary winding on a magnetic core. The primary winding has an axial length L. A compartmentalized coil former supports a high voltage coil radially surrounding the primary winding. The high voltage coil has a radial outer diameter D with the ratio of L/D being less than one. A plurality of diodes are supported by the compartmentalized coil former and connect the high voltage coils in series. The diodes are supported on the compartmentalized coil former at substantially the same axial position and are equally spaced about the periphery of the compartmentalized coil former.

Abstract: A projection television apparatus has three monochromatic picture tubes disposed in a planar orientation defining a central picture tube and two outer picture tubes. Each of the picture tubes includes a deflection unit responsive to deflection currents and raster correction signals for vertical and horizontal deflection. A control circuit, including a signal generator, supplies vertical and horizontal raster correction signals formulated for the central picture tube to all three of the picture tubes and supplies additional vertical and horizontal raster correction signals formulated for the two outer picture tubes respectively to the two outer picture tubes, respectively. Conductive paths for the formulated for the central picture tube correction signals can include variable resistors for effecting small changes in signal amplitude.

Abstract: A digital recorder which includes an A/D converter for converting analog signal to digital form for recording and a D/A converter for converting recovered recorded digital information to analog form, includes switch circuitry for interconnecting the D/A converter and the A/D converter in a manner to perform sample rate conversion of input digital signals to condition the recorder to record digital signals having different sample rates.

Abstract: Customary recorders record data packets of which the format is adapted to the data format of the recorder. If, however, the data packets have a differing format, various difficulties arise, for example, with error protection. In such cases, therefore, there is also no provision for a search mode with an at least partial evaluation of data packets.According to the invention, before the recording/storage, the data packets are consequently arranged "transversely" in accordance with FIG. 1, i.e. it is not so that each data packet (1, 2, 3, 4, 5) is progressively recorded/stored (in the vertical direction in FIG. 1), but that the first section (a) of the data packets is progressively recorded (in the horizontal direction in FIG. 1). Subsequently, the further sections of these data packets are recorded. In the fast search of a digital recorder, the helical tracks can, however, only be read section by section. Of the data packets (1 . . .

Abstract: Video signals of interlaced form are first converted to progressive scan (non-interlaced) form and then picture elements are generated that lie between the "progressive" picture elements and are interpolated by a vertical one-half (1/2) line shuffling by application of a vertical averaging. The interpolated picture elements are buffer stored and are read out again at twice the frame repetition rate whereby each second line of the stored interpolated picture elements is emitted delayed in time by 10 milli-seconds. Fields in the format 100 Hz, 2:1 interlace thereby ensue. Advantageously, interpolated picture elements are used in all of the output fields thereby avoiding picture disturbences at the frame rate (25 Hz) of the original video signal. For increasing the subjective vertical sharpness, a vertical peaking may additionally be carried out.

Abstract: An apparatus for recording/reproducing television signals transmitted in the letter-box format whereby 16:9 aspect ratio picture information is sandwiched between black areas corresponding to the top and bottom portions of the display, and wherein auxiliary items of information can be modulated onto the color sub-carrier of the television signal. The apparatus includes a luminance channel, an adaptive filter and a digital chrominance decoder for separating the television signal into a chrominance component and a luminance component. First apparatus digitally demodulates the auxiliary information from the color sub-carrier. Second apparatus applies the auxiliary signals to the luminance channel during the scanning of the black areas.

Abstract: A satellite radio receiver obtains signals from a satellite receiving installation comprising one or more frequency converters which may, for example, undergo a frequency drift as a result of temperature variations which cannot be compensated for by an AFC circuit which is located in the satellite radio receiver and which controls a carrier oscillator for carrier regeneration in a demodulator circuit. A local oscillator for a mixer is designed as a PLL local oscillator (44) which can be tuned in large or small increments. The AFC circuit (1) and a synchronizing signal evaluation circuit (40) are coupled to a control circuit (34) so that the PLL local oscillator (44) is tuned: 1) outside the control range of the AFC circuit (1), with a large tuning increment in the case of undetected synchronizing signals, and 2) with a small tuning increment in the case of detected synchronizing signals, until the control range of the AFC circuit (1) is reached.

Abstract: In a combined optical and magneto-optical recorder, data stored in pits and a magnetic layer may be simultaneously detected with an optical scanning device. Reflected light is divided by a polarizer and directed to one of two photodetectors depending on the polarization of the reflected light. A magneto-optic recorded data signal (containing cross-talk) is detected by differencing the signals provided by the two photodetectors. Reflected light is also directed through a .lambda./4 polarizer and a second beam divider to third and fourth photodetectors depending upon the polarization of the light passing the .lambda./4 polarizer. A second difference signal, which essentially conforms to the cross-talk, is generated from the differences of signals provided by the third and fourth photodetectors. The two difference signals are combined to produce a cross-talk free magneto-optic recorded data signal.