Abstract: The color television receiver includes a square-wave clock generator used as a chrominance subcarrier oscillator generating at least four clock signals, the first of which has a frequency four times the chrominance subcarrier frequency, and the second to fourth of which have a frequency equal to the chrominance subcarrier frequency, the first and second clock signals having a mark/space ratio of 1:1; a stage providing a digital chrominance signal, a first digital circuit having as one input signal the digital chrominance signal, and as another input signal the digital chroma control signal to provide a digital amplitude control of the received chrominance subcarrier wave; and a second digital circuit to provide digital PAL identification and color killer action and, if necessary, digital noise-dependent color killer action.

Abstract: An audio power amplifier with class-D push pull output stage is disclosed using a "mixture" of pulse-width modulation and pulse-amplitude modulation and driving the class-D push pull output stage with the resulting combination signal. To do this, the digital output signal of the analog-to-digital converter in the input stage is split up in such a way that only its high-order bits control the pulse-width modulator, while the other low-order bitsare changed into the aforementioned pulse-amplitude-modulated signal by means of an analog-to-digital converter.

Abstract: Circuit arrangement for the transmission and the directly following repetition of a pulse, with the duration of the transmitted pulse being equal, and the duration of the repeated pulse being in proportion to the duration of the pulse, by using a differential amplifier-like arrangement of a first and of a second transistor with two load transistors complementary thereto connected as a current-transformer circuit, and with a constant current source arranged within the common emitter circuit comprising the base of the first transistor being applied via an input capacitor to the pulse input and, across a first resistor to a fixed potential the amount of which is smaller than that of the operating voltage and greater than zero, with the signs thereof being equal to that of the operating voltage, the base of the second transistor being connected to the collector thereof and to a capacitor applied to the zero point of the circuit, the emitters of the load transistors being applied across a second and a third resist

Abstract: A monolithic integrated digital-to-analog converter is provided wherein the resistors are replaced by insulated-gate field-effect transistors thus avoiding any detrimental effects of variation between supposedly identical components. The equivalent resistance values of the insulated-gate field-effect transistors are determined by a fixed ratio of channel width to channel length.

Abstract: The present invention describes a sound channel circuit for frequency-modulated signals which operates according to fully digital principles. The circuit contains a VMOS output D-stage and no analog FM demodulator is necessary.

Abstract: A color television receiver is provided having a fully digital color demodulator wherein the luminance signal and the chrominance signals are separated and digitally processed prior to being converted to analog signals.

Abstract: A plastics container and closure assembly in which the closure has a cap part, a tear away band, an anchor band, a hinge connecting the cap part to the anchor band and a bung to seat within the mouth of the container. The bung is deeper on one side than on the other whereby when viewed from one side the bottom of the bung is formed by an oblique line extending upwardly from the deepest part of the bung to the shallowest part and wherein the shallowest part of the bung is adjacent to a thumb tab by which the cap may be manipulated and the deepest part of the bung is adjacent to the hinge. The anchor band has an auxiliary band retaining projection positioned when in use below the auxiliary bead on the container and a main band-retaining projection when in use below the main band-retaining bead the arrangement being such that when the tear-off strip is removed the cap part remains connected to the anchor band by a hinge and the anchor band is firmly held in position.

Abstract: A color television receiver is provided having a fully digital color demodulator wherein the luminance signal and the chrominance signals are separated and digitally processed prior to being converted to analog signals.