摘要:
A visual image signal processing apparatus includes: an overlaying unit for overlaying a brightness reference signal at a predetermined position in a fly-back period of an input visual image signal; a first clamping unit for clamping an output from the overlaying unit at a predetermined clamping voltage; a detecting unit for applying an output from the first clamping unit to a driving electrode of a cathode ray tube and for detecting a beam current flowing based on the brightness reference signal overlaid in the input visual image signal; and a second clamping unit for controlling the predetermined clamp voltage based on the beam current detected by the detecting unit.
摘要:
A semiconductor memory device comprising a memory cell-selecting section, an input supply control section, and a bit-line potential control section. The memory cell-selecting section includes a row decoder and a first gate circuit coupled to the output thereof. The memory cell-selecting section drives all the memory cells making up the memory device, when it is set in the mode for clearing the memory device, and the input data supply control section disconnects a pair of bit lines from a write circuit when the control section is set in this same mode. When the bit-line potential control section is set in the memory-clearing mode, it sets the potential of one of the bit lines at a high level, and the potential of the other bit line at a low potential.
摘要:
In an output buffer control circuit of a memory, the set/reset state of a flip-flop is controlled by an address transition detection output and a read detection output supplied when completion of data read from a memory cell is detected, and the active/inactive state of an output buffer for outputting the readout data from the memory cell is controlled by an output from the flip-flop. According to this arrangement, when an address input transits and the address transition detection output is enabled, the output buffer is inactivated. When data is read out from the memory cell and the read detection output is enabled after the address input transits, the output buffer can be activated.
摘要:
The threshold voltage of bit line percharge/equalize MOS transistors is smaller than that of normally ON type bit line pull-up transistors. With this feature, there is no current flows through a bit line from power source V.sub.DD during a read-out operation. The voltage difference between a pair of bit lines can be increased at high speed, thereby increasing the read-out speed.
摘要:
There is disclosed a sense amplifier characterized by comprising a pull-up circuit. The pull-up circuit comprises a first transistor arranged between the first of a pair of output nodes and a pull-up power source potential node, and a second transistor arranged between the second of the pair of output nodes and the pull-up power source potential node. The gate of the first transistor is connected to the second output node and the gate of the second transistor is connected to the first output node.
摘要:
A video amplifier is disclosed wherein the luminance signal is applied to the collector circuit of a differential amplifier comprising two transistors, the color difference signal is applied to the base of one of the two transistors, and the primary color signal is derived across a load resistor coupled to the collector circuit.
摘要:
A cathode ray tube control apparatus includes phosphor display screen, three electron guns for emitting R, G, B electron beams to the display screen, a shadow mask placed between the electron guns and the display screen, and index phosphors deposited on the shadow mask and having at least two line elements diagonal to a horizontal scanning direction of the electron beam for generating a signal according to the electron beam scan. Further provided are detector for detecting beam crossing points over the index phosphor, and correction circuit for correcting the deflection of the electron beam based on the detected beam crossing points.
摘要:
An image signal processing apparatus is provided which is applicable to a motion adaptive Y/C separation of an NTSC signal and a time-domain/spatial interpolation of a high definition television signal band-compressed by sub-Nyquist sub-sampling. The apparatus includes a still image processing circuit having frame memories, a motion image processing circuit having a line memory, a mixing circuit for mixing outputs of these processing circuits, a circuit for detecting image motion of an input image signal and applying a resultant control signal to the mixing circuit, and a signal mode control circuit for selectively adapting the image processing circuits for the processing of the NTSC signal or the high definition television signal. The motion detecting circuit includes a narrow band detecting circuit for producing a one-frame interval difference signal of a signal spectrum of a pure low frequency component from the NTSC signal or the high definition television signal respectively, a wide band detecting circuit for a two-frame interval difference signal and a composition circuit for composing outputs of these detecting circuits. The still image processing circuit, motion image processing circuit and mixing circuit are adapted to operate for the Y/C separation with the NTSC signal and for the interpolation of the high definition television signal, respectively.
摘要:
Disclosed is an automatic gain control device which comprises: a first amplitude detection circuit for detecting an average amplitude value of a television video signal, a peak amplitude value of the same television video signal, or a value obtained by mixing the average amplitude value and the peak amplitude value with a predetermined mixing ratio; a second amplitude detection circuit for detecting an amplitude value of a vertical or horizontal synchronizing signal in the television video signal; an amplitude control circuit for controlling an amplitude of an input television video signal; a synchronization circuit for detecting a vertical synchronizing signal and a horizontal synchronizing signal in the television video signal so as to generate various pulses including a clock pulse synchronized with the input television video signal by controlling an oscillation frequency of an oscillation circuit; and a synchronization phase lock detection circuit for detecting whether the synchronization circuit has been pulled into synchronism with the input television video signal, so that the amplitude control circuit is controlled by an output of the second amplitude detection circuit when synchronization phase-lock is established while controlled by an output of the first amplitude detection circuit when the synchronization phase-lock comes out.
摘要:
A control signal output circuit for outputting a control signal in response to first and second input signals and a power source voltage, comprises an inverter which inverts one of the first and second input signals and outputs an inverted signal. The control signal output circuit further comprises a logic circuit which outputs a control signal in response to the inverted signal and the other of the first and second input signals. A switch is further provided to disconnect the inverter from the power source voltage in response to the other of the first and second input signals.