Abstract: A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output video signal, and a limiter supplied with the output video signal from the receiver and further with at least one of the upper limit value and the lower limit value from the limit setup unit, wherein the limiter limits a level of the output video signal produced by the receiver, by comparing the level of the output video signal according to any of the upper limit value and the lower limit value.

Abstract: A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output video signal, and a limiter supplied with the output video signal from the receiver and further with at least one of the upper limit value and the lower limit value from the limit setup unit, wherein the limiter limits a level of the output video signal produced by the receiver, by comparing the level of the output video signal according to any of the upper limit value and the lower limit value.

Abstract: A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output video signal, and a limiter supplied with the output video signal from the receiver and further with at least one of the upper limit value and the lower limit value from the limit setup unit, wherein the limiter limits a level of the output video signal produced by the receiver, by comparing the level of the output video signal according to any of the upper limit value and the lower limit value.

Abstract: A television receiver includes a tuner for receiving either analog or digital signals. Separate analog and digital demodulators are selectively coupled to the tuner through an RF switch that is controlled by the signal from a sync detector in the output of the analog demodulator. The selected one of the demodulators develops an AGC signal that is coupled to the tuner through a current mirror. Operating potential for the demodulators is coupled through the RF switch so that the oscillator in the non-selected demodulator is disabled and precluded from interfering with the oscillator in the enabled demodulator.

Abstract: A contrast enhancement apparatus of a video signal comprises a coefficient generation unit for generating a low frequency mapping coefficient which increases or attenuates the low frequency component of the video signal, a minimum value processing unit for detecting the minimum value of the video signal, an edge detection unit for detecting rapid luminance change in the vertical and horizontal direction, a logarithmic conversion unit for converting logarithm by receiving the inputted video signal, a low-pass filter for passing a low frequency component of the logarithm-converted signal, a high-pass filter for passing a high frequency component of the logarithm-converted signal, a first multiplier for multiplying the low frequency mapping coefficient and a signal which passes low-pass filter, a second multiplier for multiplying the signal passes the high-pass filter by the signal outputted from the edge detection unit, a first adder for adding the signals outputted from the first multiplier and the second mult

Abstract: A TV receiver for receiving and signal-processing analog and digital broadcasting signals includes a dual tuner and control unit for automatically controlling RF gain of the dual tuner. A controller applies a channel select control signal according to each broadcasting viewing mode to the dual tuner and applies a AGC select signal of each broadcasting mode to a switch. The dual tuner selects a channel of a corresponding broadcasting mode among the received broadcasting signals according to the applied channel select control signal, controls the gain of the RF signal of the selected channel according to an applied automatic gain control signal, and converts the gain-controlled RF signal into an IF signal. A signal distributor identifies and outputs the IF signal output from the dual tuner according to the selected broadcasting mode (analog or digital). An analog processor restores an analog composite video signal from an analog IF signal.

Abstract: In a digital broadcast receiving apparatus for amplifying a received modulated digital signal wave RF with automatically adjusted gain and demodulating the modulated signal wave to a digital signal SDMD, a tuner 2 frequency-converts the modulated digital signal wave Srf to generate a first modulated signal SMA. A first automatic gain control amplification unit AGC1 controls gain of the tuner 2 to make a level of the first modulated signal SMA at a first predetermined level. An A/D converter 3 converts the first modulated signal SMA into a second modulated signal SMD. A demodulator 7 demodulates the second modulated signal SMD to generate a first demodulated digital signal SDD. A second automatic gain control amplifier AGC2a generates a second demodulated digital signal SMDa where frequency fluctuations included in the digital modulated wave Srf are eliminated.

Abstract: A television receiver includes a tuner for receiving either analog or digital signals. Separate analog and digital demodulators are selectively coupled to the tuner through an RF switch that is controlled by a sync detector in the output of the analog demodulator. The selected one of the demodulators develops an AGC signal that is coupled to the tuner through the RF switch. In one embodiment, a two pole RF switch is used with one pole switching the IF signal and the other pole switching the AGC signal In another embodiment, a single pole RF switch is used with the tuner signal and the AGC signal being multiplexed through the switch. This is accomplished by the provision of a high frequency path and a low frequency path between each of the RF switch and the tuner, the RF switch and the analog demodulator, and the RF switch and the digital demodulator.

Abstract: A video display apparatus for controlling the brightness of a display screen having an on-screen display portion in which the on-screen display can be satisfactorily read regardless of the picture brightness includes a display screen, circuitry for displaying on the display screen an on-screen display portion showing adjustment data for the video display apparatus, and circuitry for maintaining the brightness of the on-screen display portion substantially constant while the brightness of the display screen is changed. Also, a method for using the apparatus includes controlling the brightness of the display screen of the video display apparatus having an on-screen display portion while maintaining the brightness of the on-screen display portion substantially constant.

Abstract: An automatic clock phase adjusting device is employed principally in a picture display to adjust automatically the phase of a clock signal given to an A/D converter which converts an analog image signal into a corresponding digital image signal. The automatic clock phase adjusting device comprises a delay circuit that delays the phase of the clock signal; an image level detecting circuit that detects the image level of a horizontal image starting portion of the digital image signal and the image level of an image terminating portion of the digital image signal; and a control circuit that controls a delay by which the delay circuit delays the clock signal on the basis of the output signal of the image level detecting circuit.

Abstract: A band-pass filter separates an audio intermediate frequency signal from an input intermediate frequency signal, and an A/D converter circuit converts the signal into a digital signal. A DSP performs audio detection on the signal and forms an AGC signal based on the signal. A variable gain amplifier performs AGC on the signal. A band-pass filter separates and takes out a video intermediate frequency signal from the signal, and an A/D converter circuit converts the signal into a digital signal. A DSP performs video detection on the signal. An AGC signal is formed based on the signals and AGC is performed on the signal by using the signal.

Abstract: A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The tuner supplies a final IF signal in a 6-MHz-wide frequency band, the lowest frequency of which is not appreciably more than 2.69 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.69 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.

Abstract: A television receiver includes an input terminal (12). Through the input terminal is inputted an input signal having a predetermined electric field intensity. That is, a tuner (14) converts the input signal into a video intermediate frequency signal and audio intermediate frequency signal. The video intermediate frequency signal is amplified by a video intermediate frequency amplifier circuit (16). Based on that frequency, a filter (26) outputs a detection signal (Va). An RF-AGC circuit (32) outputs a reference voltage (Vref). An RF-AGC circuit (30) creates a control voltage (Vb) in response to a difference between the detection signal and the reference voltage. The tuner is controlled in gain by this control voltage. The reference voltage is varied by a micro-computer (36) depending upon the control voltage. Accordingly, the control voltage is adjusted to a desired voltage value.

Abstract: An image mode selecting method and apparatus for a television receiver which can display n images corresponding to n image modes on a screen utilizing a picture-in-picture (PIP) display function, so that a user can easily select an optimum image among the displayed images. According to the method and apparatus, the n images corresponding to the n image modes are displayed on the n PIP regions of the screen, respectively, by pressing an image selection key, and then the optimum image among the n displayed images can be selected by pressing a numeral key corresponding to the selected image.

Abstract: A video signal processing apparatus is provided that includes a gate pulse generator and a luminance signal processing unit. The gate pulse generator detects a high frequency band in accordance with a luminance signal separated from a composite video signal and outputs a gate pulse signal. The luminance signal processing unit adjusts a contrast with regard to a high frequency band in the luminance signal in accordance with the gate pulse signal received from the gate pulse generator. The high frequency band having a large black/white comparison is detected in the apparatus from the luminance signal, and a contrast processing with regard to the luminance signal is decreased in the detected high frequency band. Thus, the video signal processing apparatus can reduce or eliminate a picture flickering in the radio frequency band.

Abstract: A method and apparatus for dynamic contrast improvement in video pictures. There is a strong demand for picture contrast but each video display has a limited dynamic range. The picture contrast can't be increased by simply increasing the video signal amplitude because exceeding the display dynamic range in some video scenes causes unwanted disturbing effects. According to the present invention the video pictures are analysed framewise in real time and the parameters of a transfer function for contrast improvement are adjusted depending on the analysis results for the best subjective picture quality.

Abstract: A HDTV automatic gain control system includes a VSB mode detector and adjusts the gain according to the detected VSB mode to maximize the efficiency of the equalizer. Moreover, the HDTV automatic gain control system controls the input gain signal to be greater for the 16VSB mode than other modes.

Abstract: In the &ggr; correction circuit, a crossover point arithmetic processing unit performs arithmetic processing for each region on crossover points y in the output data direction of a &ggr; correction crossover line based on a plurality of slope data A respectively specified for each of a plurality of regions and crossover point positions X in the input data direction set in advance.

Abstract: The present invention discloses a device and method for generating an auto gain control signal. When a gain of an input signal is very different from a wanted gain, an increase of an integral value is prevented by repeatedly resetting an integrator. Especially, the device can sensitively respond to a fast moving substance on a channel, by reducing a repeated reset period of the integrator. At the same time, it is possible to minimize reduction of the performance of a receiver due to a residual jitter generated by the shortened period. As a result, the receiver has an improved performance in regard to the gain variations of the whole channels.

Abstract: An HDTV receiver includes an AGC system that develops an RF AGC voltage that is derived on an analog basis and an IF AGC voltage that is derived on a digital basis. The digital voltage is developed from an error signal that comprises the most significant bits of a continuously operated large accumulator that is supplied with the algebraically combined output of the digital signal and an AGC reference number.

Abstract: An AKB interface apparatus in a display system (10), includes a video signal processing IC (12) having outputs coupled via respective kinescope driver ICs (18,20,22) to respective kinescope cathodes (K1,K2,K3) for display of a color image, the signal processing IC having an input 27 for receiving an AKB input signal, the driver ICs having respective outputs (28,30,32) providing respective cathode current indicating signals (RP,GP,BP) An interface circuit (100) couples the cathode current indicating signals to the AKB input of the signal processing IC. The interface circuit comprises a load circuit (110) for generating a load voltage (Vo) in response to at least one of the cathode current indicating signals. A leakage correction circuit (130), responsive to said load voltage (Vo), feeds back a leakage correction current (Io) to the load circuit.

Abstract: A video decoder circuit is provided with automatic AGC bias voltage calibration. The video decoder circuit has an input for receiving a video signal that is capacitively coupled to an analog front-end circuit. The decoder circuit includes a microprocessor-based control circuit coupled to the analog front-end circuit. The control circuit includes a bias circuit, a gain interface circuit for changing the amplitude of the video signal prior to filtering in a filter circuit, an offset circuit for changing the DC-level shift of the video signal, and a switching circuit for switching into a calibration mode by bypassing the filter circuit and connecting the gain interface circuit directly to an analog-to-digital conversion circuit of the analog front-end circuit.

Abstract: Recent circuit concepts inject measurement lines, for cutoff and drive control of the cathode current, into each color channel during the vertical frame blanking period. Owing to the physically dependent exponential beam current characteristic profile as a function of the cathode control voltage VK, the exponent &ggr; of the characteristic profile and the ratio of two cathode components IK1 and IK2 may be used to form control reference values for cutoff and drive control, this process being started in each case from a fixed value of the exponent &ggr; or of the ratio of the two cathode currents IK1 and Ik2. However, it has been found that, if a fixed value is assumed for the exponent &ggr; or for the ratio of the two cathode currents IK1 and IK2, it is not possible to achieve an optimum result for displaying monochrome pictures. Thus, according to the invention, the exponent &ggr; is defined as a function of the color tube 1. The aim in this case is to reduce a &ggr;-dependent DC voltage offset u0f to zero.

Abstract: A digital AGC circuit is provided which includes an A/D converter, an AGC gate pulse generator and a TOP voltage controller. The A/D converter converts a video signal clamped to a reference level into digital data having a voltage between a predetermined reference voltage and a TOP voltage. The AGC gate pulse generator generates an AGC gate pulse for detecting a pedestal level region of the video signal, according to vertical and horizontal synchronous signals. The TOP voltage controller controls the TOP voltage of the A/D converter on the basis of a sample value extracted from the output of the A/D converter and a sync tip value of a standard signal, while the AGC gate pulse generated by the AGC gate pulse generator is enabled. All circuits but the low pass filter are digital circuits, so a special analog AGC IC is not needed. AGC is performed by controlling the TOP voltage of the A/D converter, thereby accomplishing an accurate AGC.

Abstract: The depth of modulation and the absolute RF carrier level of an amplitude-modulated video signal are automatically adjusted. For adjustment of the depth of modulation, a sync tip of the video signal is sampled, corrected and normalized to a reference level, e.g., a 50% video level. A reference pulse is inserted into the video signal, e.g., in a sync pulse or in lines 22 and/or 23 of the vertical blanking interval. The reference pulse is sampled and compared to the normalized sync tip pulse to determine an error. The error is converted to an adjustment signal for a charge pump which increases or decreases the depth of modulation accordingly. For adjustment of the absolute carrier level, the insertion of a reference pulse is not required. Instead, a reference value is stored in a memory and retrieved for comparison with the corrected sync tip pulse. An error term is computed and converted to an adjustment signal for a charge pump which increases or decreases the absolute carrier level accordingly.

Abstract: A high definition television tuner includes a frequency compensated PI type PIN diode attenuator with the current through the series diode controlled separately from the current through the shunt diodes. A look-up table contains information that correlates the selected RF frequency and the desired AGC level with input data for two D/A converters. A microprocessor controls the D/A digital data, which is based upon information provided by a digital signal processing circuit. In one embodiment of the invention, the look-up table is connected between a D/A converter and a microprocessor and the microprocessor controls the look-up table for supplying the digital data to the D/A converters. In another embodiment, the microprocessor, after receiving the desired AGC level information, first interrogates the look-up table, then supplies the digital data to the D/A converter based.

Abstract: An apparatus and method for magnifying a dynamic range of an image while improving a contrast of an image are provided. A histogram calculator receives a digital image signal and calculates histograms depending on the illuminance distribution of an image. A histogram accumulator receives a histogram output by the histogram calculator, obtains an accumulative density function by integrating the input histogram up to each illuminance level and normalizes the accumulative density function, and generates an initial conversion function. A bias calculator determines a threshold value for dividing into a low illuminance level and a high illuminance level on the basis of a histogram output by the histogram calculator, and obtains a histogram compensation function for applying a negative bias to a histogram around the threshold value.

Abstract: A color display with a white balance self-adjusting function, including a DC-voltage-level/gain adjusting circuit for adjusting, on the basis of adjustment data, the DC voltage level and the gain of each of R, G and B primary color signals, thereby outputting the adjusted signals. Also includes is a CRT driving circuit responsive to the output signals of the DC-voltage-level/gain adjusting circuit for outputting CRT driving signals to drive the color CRT of the display, and a cathode current detecting circuit for detecting currents flowing through the cathode electrodes of the color CRT.

Abstract: A method for the analog/digital conversion and an arrangement for the analog-to-digital conversion of an analog signal, particularly a picture signal, into a digital signal by at least two analog-to-digital converters which are clocked by at least two phase-shifted clock signals and whose output signals are combined to a digital picture signal by a multiplexer is disclosed. In order to achieve an individual adaptation to different characteristics of the analog-to-digital converters, each analog-to-digital converter is preceded by an automatic gain control circuit and a clamping stage, which clamps the picture signal at a given amplitude value, the analog signal being applied to the automatic gain control circuit and the clamping stage.

Abstract: A television system for displaying images having adjacent horizontal blocks with sharp contrast. In general, such sharp contrasts can cause the drive voltage (Hv) applied to an anode of a CRT display unit to change. The changes typically result in distortions in the displayed images. A correction logic is employed to regulate the voltage source that supplies the voltage to the anode of the CRT display unit. The correction logic examines the digital data representation of the images to determine the extent of contrast, and supplies a corresponding correction voltage to regulate the voltage source. Due to the correction voltage, a constant drive voltage is supplied to the anode. The distortions are thus minimized or eliminated.

Abstract: A digital automatic gain control circuit for a receiver includes an averaging block and an adjustment block. The averaging block receives a length of a digital sample stream that represents an incoming analog signal and produces an absolute average signal. The adjustment block receives the absolute average signal and a reference signal and outputs an adjustment signal for controlling gain. The adjustment signal is based on a difference between the absolute average signal and the reference signal. In an alternative embodiment, a method of controlling gain according to the invention includes the steps of calculating an absolute average of an incoming signal, and comparing the absolute average to a reference to produce an adjustment signal based on a difference between the absolute average and the reference.

Abstract: A method and apparatus for controlling contrast of images when displayed on a monitor begins when signals corresponding to an image and a contrast feedback signal are received. The signals are mixed with the contrast feedback signal to produce image output signals. The contrast feedback signal is, in turn, determined based on the contrast level of the image output signals. As such, a closed loop feedback circuit is provided to control the contrast levels of the image output signals.

Abstract: An automatic gain control (AGC) circuit of a high definition television (HDTV) signal receiver and a method to compensate for a change in amplitude of a high definition signal. The AGC circuit of the high definition signal receiver includes a non-coherent AGC signal generator for generating a first AGC signal according to the magnitude of the IF signal, a coherent AGC signal generator for generating a second AGC signal according to the magnitude of the segment synchronizing signal, and a selector for selecting the second AGC signal when the segment synchronizing signal is detected and the first AGC signal when the segment synchronizing signal is not detected and providing the selected signal to a tuner/IF demodulator.

Abstract: A television signal receiving tuner comprises a variable attenuating circuit for attenuating an inputted television signal and outputting the attenuated signal, a preamplifying circuit for amplifying the attenuated signal outputted from the variable attenuating circuit, an input tuning circuit for tuning the amplified television signal outputted from the preamplifying circuit, and a variable gain amplifying circuit for amplifying the tuned television signal outputted from the input tuning circuit.

Abstract: In an automatic gain control loop circuit supplied with two channel signals alternately input thereto, a first capacitor filter and stores the first signal output from the level detector circuit, and a second capacitor filters and stores the second signal output from the level detector circuit. The second signal is output only during the signal period of a second channel included in the two channels. An adder adds the second signal stored in the second capacitor to the first signal stored in the first capacitor. A switch selects the first signal stored in the first capacitor during the signal period of the first channel, and selects an output from the adder during the signal period of the second channel. The selected signal is fed back to the gain control input terminal of the variable-gain amplifier circuit. With there features, a flicker is prevented from occurring when the two channel signals are switched.

Abstract: A protective circuit and a signal processor for a three-CRT projection TV for preventing CRT burnout, deterioration of luminous characteristics, and damage to lenses by heat. Each CRT beam current detection circuit detects the beam current of each CRT. A state of the video image is predicted based on the detected beam current values and their duration. A microcomputer determines a control voltage for controlling the contrast based on the state of the video image, detected values, and their duration. The contrast is thus controlled by a control signal output to a video control circuit which controls the beam current.

Abstract: An automatic contrast control circuit for a display device includes a distance detector installed on a front panel of the display device, for detecting a distance existing between a user and the front panel and generating a distance signal representative of the detected distance; and a micro-computer for outputting a contrast gain control signal based on the distance signal output from the distance detector, and outputting on screen display (OSD) data indicative the contrast gain signal. A display control panel is provided on the display device to permit user input of an automatic contrast control (ACL) function and an OSD function. The distance detector includes a light emitting unit for emitting light from the display device, and a light receiving unit for receiving the light reflected from the user to detect the distance between the user and the front panel of the display device.

Abstract: An image data signal processor, that includes a clamp circuit for clamping a DC level of an image data signal to a predetermined level to produce a clamped image data signal, an A/D converter for A/D-converting the clamped image data signal into a digital image data signal based on a lower reference voltage and an upper reference voltage, wherein the predetermined level is a minimum level of the A/D converter, and a reference voltage generating section for generating the lower and upper reference voltages from the digital image data signal to send to the A/D converter.

Abstract: An image display system includes a display circuit which displays an image composed of a plurality of sub-images, an input circuit which inputs a certain image signal including at least one sub-image embedded in the certain image signal which is provided by at least one of fields and frames, a designating circuit which designates timings of composition positions of the sub-image on scan lines of the certain image, and one control circuit which controls at least one of an amplitude level and a DC level of image signals corresponding to an area of the sub-image detected by the timing designated by the designating circuit.

Abstract: The present invention relates to a dynamic range expanding apparatus. The dynamic range expanding apparatus realizes a wide dynamic range for a video image while reducing the quantization noise, by determining the brightness transform function based on the combined results of the differential and the integral operation with respect to a brightness distribution function. Moreover, the dynamic range expanding apparatus transforms the color difference signal by using the brightness transform ratio without losing the valance in a color tone.

Abstract: An automatic gain controlling circuit and a high-definition television signal receiving apparatus includes an input terminal for receiving a signal including first and second signal components creating interference, a first automatic gain controlling amplifier for amplifying the received signal and providing an amplified output signal, a filter for selectively passing a signal portion in a predetermined band of the amplified output signal from the first automatic gain controlling amplifier, and a second automatic gain controlling amplifier for amplifying the signal portion passed by said filter and providing amplified output signal portion.

Abstract: An anti-eye strain apparatus and method which automatically adjusts the brightness of a display to cause the muscles of the eyes of the user to adjust and refocus such that eye fatigue or tiredness is reduced or eliminated. The brightness is varied within a particular range and the brightness within this range is occasionally or periodically adjusted. The changing brightness preferably follows a predetermined pattern or cycle. These brightness changes may be perceptible or imperceptible to the viewer. The brightness of the display may be adjusted electronically or mechanically, for example by a potentiometer, by a computer attached to a monitor, for example by an application or software, or by changing the palette of colors or the gray scale.

Abstract: A method and a device for adaptively performing local contrast enhancement by weighing a video signal according to the magnitude of the local contrast of the video signal and by adding the weighted signal to the original video, thereby being capable of outputting the original signal intact regardless of the size of the local contrast. The device for enhancing a local contrast in a video signal processor has an M.times.N window processor for generating an M.times.N window signal calculated from an input video signal; an M.times.N lowpass filter for lowpass-filtering an M.times.N window signal generated in the M.times.N window processor; a first adder for calculating the difference between the output of the M.times.N lowpass filter and a central output of the M.times.

Abstract: A direct current controlled differential base voltage generating circuit, applicable to a gain control of an RGB video amplifier for controlling a contrast by a voltage generating circuit in which an input control signal has a voltage within a set range, has a high input impedance. Since a differential base voltage is controlled by an input control signal applied thereto through bases of PNP Darlington-connected transistors, the circuits high input impedance can provide operation when a voltage of the input control signal is about 0 volts. Therefore, the direct current controlled differential base voltage generating circuit can easily interface with a computer controlled alignment system.

Abstract: A method and apparatus for improving the color rendition of a color television receiver includes variable gamma circuits for exponentially correcting the individual color signals. A user control is added to allow user control over the overall gamma of the color television receiver thereby rendering the colors more saturated. With the inclusion of this user gamma control, a separate control for brightness, which affects the overall bias on the CRT, is now obviated.

Abstract: A circuit for peaking video signals, which can be developed by combining a video signal with a peaking signal having a preshooting and a overshooting potion that are respectively controlled in peaking levels thereof. The circuit includes a delay circuit for delaying a luminance signal for a first predetermined time in order to generate a first delayed signal and for delaying the first delayed signal for a second predetermined time in order to generate a second delayed signal. An adder adds the second delayed signal to a current video signal in order to generate an added signal. A variable amplifying section amplifies the added signal in response to a first control signal from an exterior in order to generate a first variable amplified signal, and amplifies the added signal in response to a second control signal from the exterior in order to generate a second variable amplified signal.

Abstract: An analog to digital converter circuit having sync control is constructed to monitor the sync condition of the digital output. When sync is lost, for example due to a low input signal level or due to an out of phase situation, the gain of the output increased to relatively high level so as to enhance the possibility of detecting the sync condition. As soon as sync is reestablished the gain is immediately turned down to a level lower than the blanking level and then gradually increased to the blanking level. The gain levels at startup and during the sync reestablishment intervals are fixed but under selective control.

Abstract: A method and apparatus of adjusting the display of the monitor by modifying the parameter values of the adjustable display functions. When the user begins to press the select key on the control panel, the display of the monitor is altered by recursively varying the parameter value of the selected display function from the maximum to the minimum, for indicating the type of the display function to be selected. Such a dynamic display can be obtained by using the microcontroller of the monitor. The monitor will exhibit the display effect of the display function to be selected. Therefore, the user can realize the display effect of these display functions, without having to memorize the simplified figures associated with these display functions. Then the user can adjust the display of the monitor through depressing the adjust key on the control panel.

Abstract: A fusing system is provided in connection with an integrated circuit, which may be mounted within a semiconductor integrated circuit package having a plurality of external pins. The fusing system is provided with a fusing control circuit operable in an adjusting mode and in a fusing mode, which receives a serial data signal and uses that signal in one way when in an adjusting mode and in another way when in a fusing mode. A fusing circuit is provided for fusing selected ones of the fusible links when the fusing control circuit is in the fusing mode. The fusing system may be used as part of an automatic gain control system for automatically controlling the signal strength of a video signal output from a video processing circuit.

Abstract: There is disclosed a device for the generation of transfer functions by segments. One of the device comprises at least two sets of amplifiers having different gains; a comparator for comparing an input signal with at least one reference signal and a switch which is controlled by the output from the comparator, for switching between the at least two sets of amplifiers depending on the status of the comparator output. Where the at least two sets of amplifiers having different gains, at least one gain is greater than 1, and at least one gain is less than 1.