Abstract: A video signal processing circuit is supplied with an analog composite video signal formed by combining at least a luminance signal with a sync signal, and processes the analog composite video signal. The video signal processing circuit has an analog filter which removes high-frequency components from the analog composite video signal, a sync separation circuit which separates a sync signal from an output signal from the analog filter, an AD converter which performs AD conversion on the analog composite video signal, and a digital video signal processing circuit which performs predetermined video signal processing on the composite video signal digitized by the AD converter, by using the sync signal obtained by the sync separation circuit.

Abstract: A vertical sharpness adjustment device with which a viewer of a TV receiver can choose a degree of vertical sharpness adjustment to enhance a contour of a picture in vertical direction is offered. The vertical sharpness adjustment device includes a terminal to which a vertical sharpness control signal given by the viewer is applied, a control circuit to which the vertical sharpness control signal from the terminal is applied and a vertical sharpness adjustment circuit which adjusts the degree of the vertical sharpness of a video signal according to the vertical sharpness control signal from the control circuit.

Abstract: A video signal processing circuit is supplied with an analog composite video signal formed by combining at least a luminance signal with a sync signal, and processes the analog composite video signal. The video signal processing circuit has an analog filter which removes high-frequency components from the analog composite video signal, a sync separation circuit which separates a sync signal from an output signal from the analog filter, an AD converter which performs AD conversion on the analog composite video signal, and a digital video signal processing circuit which performs predetermined video signal processing on the composite video signal digitized by the AD converter, by using the sync signal obtained by the sync separation circuit.

Abstract: The power supply circuit of this invention includes a constant voltage element which generates an output voltage insensitive to change in ambient temperature, a power supply transistor, to a base of which the output voltage of the constant voltage element is applied and from an emitter of which a power supply voltage is provided, a load connected to an emitter of the power supply transistor and a differential amplifier to one input terminal of which an emitter voltage of the power supply transistor is applied and to the other input terminal of which a voltage corresponding to the output voltage of the constant voltage element is applied, and a voltage corresponding to an output voltage of which is applied to the base of the power supply transistor.

Abstract: A vertical sharpness adjustment device with which a viewer of a TV receiver can choose a degree of vertical sharpness adjustment to enhance a contour of a picture in vertical direction is offered. The vertical sharpness adjustment device includes a terminal to which a vertical sharpness control signal given by the viewer is applied, a control circuit to which the vertical sharpness control signal from the terminal is applied and a vertical sharpness adjustment circuit which adjusts the degree of the vertical sharpness of a video signal according to the vertical sharpness control signal from the control circuit.

Abstract: A white balance adjusting apparatus includes a test signal source 13 for generating a black signal for testing and a white signal for testing, a first impedance means 1 for converting currents flowing through three drive transistors for amplifying primary color R, G, B signals into voltages, a second impedance means 5 connected in parallel with the first impedance means, a switch 6 which is selectively closed to flow a current through the second impedance means, a reference voltage source 7 for generating a first reference voltage at the time of performing the cut-off adjustment and a second reference voltage at the time of performing the drive adjustment, a comparator 8 for comparing the levels between the reference voltages of the reference voltage sources and the output voltage converted by the first or second impedance means, and a microcomputer 75 which generates a control signal for adjusting the white balance on the basis of the output signal of the comparator and adjusts the DC level and the AC level

Abstract: The power supply circuit of this invention includes a constant voltage element which generates an output voltage insensitive to change in ambient temperature, a power supply transistor, to a base of which the output voltage of the constant voltage element is applied and from an emitter of which a power supply voltage is provided, a load connected to an emitter of the power supply transistor and a differential amplifier to one input terminal of which an emitter voltage of the power supply transistor is applied and to the other input terminal of which a voltage corresponding to the output voltage of the constant voltage element is applied, and a voltage corresponding to an output voltage of which is applied to the base of the power supply transistor.

Abstract: A partial image section is set as including part of a contour line of a particular image area in an original image appearing on a display screen. An image in the partial image section is binarized by referring to a selected threshold level. A boundary of the resulting binary image is detected for extraction of contour data in the partial image section. A plurality of such partial image sections are set successively in a way to partly overlap each other. Contour data (N2,M2) in an overlapping region of two adjacent partial image sections (Ni,Ni-1) are extracted by obtaining a plurality of dividing points (m.sub.0,n.sub.0,m.sub.1,n.sub.1, etc.