Abstract: In a color television receiver adapted to receive a color television signal containing vertical interval reference (VIR) signals, a VIR correction circuit is provided to automatically control the hue and color saturation of the received broadcast signal, which may also be coupled to a video tape recorder of the type in which adjacent field signals are recorded with their respective record tracks being skewed relative to each other to permit elimination of otherwise required guardbands between adjacent field tracks. The recorded video signal is reproduced by mixing adjacent horizontal line signals to reduce crosstalk level. A disabling circuit is provided to disable the VIR correction circuit when the receiver is switched to the output of the video tape recorder in playback mode to prevent false VIR signals due to the mixing from affecting the reproduced colors.

Abstract: A television signal discrimination system is used in a television receiver provided with an electronic tuner for producing as output an intermediate-frequency signal whose synchronizing frequency is varied in response to an applied voltage and with a circuit for detecting the output signal of the electronic tuner.

Abstract: In a color signal reproducing circuit, a red color difference signal from a color demodulator circuit is corrected by a blue color difference signal, and the blue color difference signal is corrected by a luminance signal. The phase of a color subcarrier signal to be supplied to the color demodulator circuit is controlled by the corrected red color difference signal during reception of a VIR signal, and the level of a color signal to be supplied to the color demodulator circuit is controlled by the corrected blue color difference signal. The controls of hue and color saturation are facilitated by the use of the corrected color difference signals. It is also made possible to deliver from the color demodulator circuit, color difference signals which match the fluorescence characteristics of a color picture tube.

Abstract: A vertical deflection circuit is used in a camera tube in a color television camera in which the camera tube is provided with an optical filter having an optically black part extending in parallel with a beam scanning direction of the camera tube. A vertical deflection circuit comprises a circuit for generating a saw-tooth voltage for vertical deflection, a vertical deflection coil for the camera tube, and a circuit for supplying the saw-tooth voltage thus generated to one end of the vertical deflection coil in DC coupling. Due to temperature fluctuation, a vertical deflection width fluctuates with respect to a position corresponding to a black part of the filter, as a reference.

Abstract: An input signal is coupled via a capacitor to a base of a transistor which constitutes a differential amplifier with another transistor. The base of the transistors are respectively fed with first and second predetermined voltages via a pair of transistors so that the differential amplifier produces an output signal proportional to the difference between the peak value of the input signal and a predetermined value only when the peak to peak value of the input signal exceeds a predetermined voltage.

Abstract: A tint control circuit for color television receivers includes a voltage-controlled oscillator for locally generating a color subcarrier, a variable phase shifter shifting the phase of the generated subcarrier in dependence on a manually adjusted DC control voltage, and a phase detector which allows a received color burst to be supplied to a load circuit in dependence on the difference in phase between the color burst and the DC-controlled, variable phase-shifted subcarrier in order to derive a DC control voltage from the load circuit which controls the voltage-controlled oscillator.

Abstract: Two terminals of a variable resistor are respectively connected via resistors to bases of two transistors which constitute an input stage of a differential amplifier while the movable contact of the variable resistor is fed with a predetermined voltage. Either the resistance of the variable resistor with respect to the resistances of fixed resistors connected to the bases or the ratio between the fixed resistors is so selected that the variation of the maximum resistance of the variable resistor does not influence the relationship between the position of the movable contact and the gain of the differential amplifier.

Abstract: A rotor structure for a magneto generator is disclosed which comprises a yoke of cup-like shape consisting of a cylindrical wall and a side wall extending from one end of the cylindrical wall, a plurality of magnets provided by permanent magnets disposed on the inner surface of the cylindrical wall of the yoke in a relation spaced apart by a predetermined distance along the circumference of the cylindrical wall. The magnets are maintained in the predetermined positions by a pair of spaced annular holding plates having respective surfaces facing each other to make area contact respectively with and sandwich the magnets in a direction of the axis of the yoke, and a cylindrical holding plate acting to press the magnets against the inner surface of the cylindrical wall of the yoke by making area contact with the inner surfaces of the magnets.

Abstract: In a subcarrier regeneration circuit for color television receivers, a phase detector output is sampled by a signal sample-and-hold circuit and a bias sample-and-hold circuit to develop a voltage between the outputs of the two sample-and-hold circuits to control the frequency of a 3.58 MHz subcarrier generated by a voltage controlled oscillator. The oscillator output is phase shifted by 90.degree. and applied to one input of the phase detector for comparison with a gated color burst. The signal sample-and-hold circuit samples the phase detector output during the interval of the color burst, while the bias sample-and-hold circuit samples the phase detector output during an interval which is substantially equal to the flyback interval minus the color burst interval.

Abstract: A variable frequency oscillator comprises an oscillating loop and a variable phase shifter for imparting one of two different phase shifts depending upon the polarities of a DC control voltage to a signal from the oscillating loop. The phase-shifted signal has its amplitude controlled by the amplitude of the control voltage and is combined with the signal in the oscillating loop. The vector sum of the combined signals determines the phase angle of the oscillator signal and hence the frequency thereof.