Abstract: A television field deflection circuit with a rapidly controllable large linearity. The deflection current is integrated in a first integrator which is followed by a second integrator having an adjustable time constant. The signals integrated once and twice are applied to a difference amplifier, while the signal integrated once is inverted and is adjustable through a feedback circuit. Subsequently a signal combination is formed of a non-integrated signal, a signal integrated once in phase, an adjustable signal integrated once in opposite phase and an adjustable signal integrated twice. The signal combination is fed back to a difference amplifier through which the deflection coil is fed and to which furthermore a sawtooth-shaped signal with a parabolic component is applied.

Abstract: Before mounting, coils heads comprising clearly defined faces and edges are formed on deflection coils by moulding. The sides of the flared portion of the coils are also clearly defined by the same operation. After mounting, the coil bears in the coil holder by way of the faces and edges formed.The sides of the flared portion abut against projections formed on the coil holder. The flared portion is completely clear from the coil holder.

Abstract: Circuit arrangement for processing a NTSC chrominance signal in which the NTSC color synchronizing signal is modulated in phase so that PAL demodulation techniques may be used for obtaining a low-noise amplification control voltage and/or a low-noise color killing voltage.

Abstract: A field output circuit in which for preventing vertical bounce of the picture and of linearity errors a feedback alternating current path is provided which includes a field frequency clamping circuit. In one embodiment the clamping circuit may be formed by the field oscillator constituted as a capacitive sawtooth generator.

Abstract: A circuit arrangement for generating in a color picture display device a sawtooth correction current of line frequency flowing through the line deflection coils and having an amplitude varying at field frequency for the purpose of obtaining a better color superposition in the corners of the screen of the display tube. The circuit arrangement is provided with a modulator which includes an electronic switch switching at the line frequency, which connects a field generator to a resonant circuit during the line scan period, which resonant circuit includes in a parallel arrangement a capacitor and an inductance including the line deflection coil, the period of the resonant frequency of the resonant circuit being substantially twice the line flyback period.

Abstract: A TV circuit for generating a synchronized horizontal frequency signal has an oscillator and a phase discriminator. The discriminator has a current applied to it that is derived from and proportional to a current in the oscillator so as to eliminate the effects of temperature and voltage variations.

Abstract: When adjusting a color television camera a specific test pattern comprising dark and bright areas is used which is placed in the ambient light of a scene to be taken. By means of measuring locations in line scanning rasters the black level and the peak-white value in the test pattern signals are fixed at reference values. Thus the picture signals are given the nominal values matching the ambient light. Then other measuring locations are moved, by scanning raster displacement and/or scanning raster shaping, to bright-dark transitions in the image of the test pattern at which an intermediate reference value is provided. Absolute scanning raster positioning is carried out without being influenced by non-linearities, in contradistinction to the case when using a reference scanning raster.

Abstract: A color television system for transmitting a color television signal, specifically for recording on and subsequently reproducing from a record carrier. The color television signal to be transmitted contains a first carrier which is frequency-modulated with the luminance information and a second carrier which is modulated with the chrominance information, whose frequency lies between zero and the first-order lower side band of the modulated first carrier which corresponds to the highest modulation frequency. Said second carrier does not have a fixed frequency, but is locked to the instantaneous frequency of the modulated first carrier by a constant integral ratio. Depending on the characteristics of the transmission medium and the signal processing equipment said ratio is preferably two or three.

Abstract: A television tuner features a switching voltage generator that resets the voltage across the varicap tuning diodes to about zero voltage when a new tuning range is switched on. This allows the full steepness of the capacitance-voltage characteristics of the diodes to be used in each range. This in turn allows more ranges to be tuned and reduces the effects of stray capacitances.

Abstract: A system for transmitting split-phase Manchester coded information signals, in which a synchronization signal is used to enable phase-synchronous detection on the receiver side of the split-phase coded information signals. This synchronization signal has a first signal level for at least three successive half bit times of the information signal, and a second signal level for at least three successive half bit times of the information signal.

Abstract: For simultaneous correction of all function adjustments of, for example, a television receiver, adjustable correcting information is stored by means of a normal function control members in a memory which is read out on operation of a function correction member.

Abstract: A circuit for reproducing recorded PAL TV signals features a pair of mixers that produce signals of opposing phases. Thus the same picture can be repetitively viewed without losing the PAL phase alternation. Drop out compensation can be added.

Abstract: Interference oscillations in the frequency ranges around 0.2 MHz and 1 MHz are eliminated in a deflection coil by the provision of an additional circuit element. The additional circuit element can be formed by an additional electrically conductive foil which is connected to the current supply side of the line coil sections or by a capacitor which connects this supply line to the central contacts of the series-connected frame coil sections. The connection of the coil sections with respect to each other should usually be adapted to the winding sense of the coil sections so as to ensure proper elimination of the interference oscillations.

Abstract: A field-sequential color television camera provided with a pick-up device formed with a number of read strips to be read simultaneously along and in front of which filter strips of a color filter move. An output of the pick-up device supplying output signals associated with successively different colors of the filter strips and with a given read strips is associated with each read strip. The outputs of the pick-up device are connected to a sequential-simultaneous converter so that picture signals each associated with a different color but with an instantaneously identical read strip of the number of read strips occur at camera outputs through a switching circuit and delay circuit. Movement in a scene does not exhibit any disturbing discolored edges upon display such as a so-called "color break". A simple converter construction is possible.

Abstract: A surface wave TV I.F. filter has a transducer with two passbands. Each is unsymmetrical with respect to itself and a mirror image of the other. A second transducer suppresses one of the passbands.

Abstract: Switching off the automatic tuning correction of a receiver during tuning is accomplished with a signal derived from a level variation caused by a level adjusting circuit coupled to a tuning member.

Abstract: Radio receiver provided with varactor tuning. To maintain the signals across the varactor of the preselection circuit sufficiently small the receiver has a controlled input stage which is connected before the circuit and a limiter which has a controlled threshold voltage and is connected to the input circuit.

Abstract: A station finder which switches to automatic frequency control during automatic finding in case of reception of a transmitter and, if desired, continues to find a transmitter some time later with the frequency control switched off.

Abstract: Correction of the influence of noise on the output voltage of a detection circuit for automatic frequency control by using a product demodulator with a filter having a pole at the picture intermediate frequency and a zero crossing at a frequency between a sound intermediate frequency and the picture intermediate frequency.

Abstract: A circuit controls the gain of a first active stage in a radio receiver. The control voltage is derived from a point ahead of a filter, and thus controls the gain when a strong off channel signal is present. A normal AGC can also be used for on channel signals.