Abstract: Digital signal acquisition system is triggered when an input waveform matches a known reference waveform. This is achieved by calculating a stream of error metric values defined as a sum of absolute values of differences between incoming and reference samples. An error metric is calculated using only byte operations, which is advantageous for hardware implementation. A waveform trigger is determined by a sample index corresponding to a minimum value of the error metric and corresponds to a best match between input and reference waveforms. A waveform trigger is used for synchronous averaging and estimating time domain noise voltage. A reference waveform updates in poor SNR conditions to provide robust estimates of time domain noise by reducing reference waveform jitter.

Abstract: A horizontal deflection circuit having a horizontal output transistor that receives an input horizontal driving signal and drives a horizontal deflection coil includes a current controlling unit to selectively perform an operation to decrease a base current applied to a base terminal of the horizontal output transistor, and a controlling unit to sense a frequency of the horizontal driving signal and to enable the operation of the current controlling unit when the sensed frequency of the horizontal driving signal is higher than a predetermined level. Accordingly, the horizontal deflection circuit can control the base current of the horizontal output transistor according to a frequency mode, thereby decreasing damage to the horizontal output transistor.

Abstract: A CRT electric field shield display apparatus with an FBT having a plurality of high voltage output terminals, includes an offset voltage generator generating an offset voltage to offset an electric field due to high voltages outputted from the plurality of high voltage output terminals; and an electric field shielding member disposed around the FBT and having a conductor to which the offset voltage is applied.

Abstract: The high voltage supply for a picture tube comprises a high voltage transformer, which generates the anode voltage of the picture tube, and a high voltage module with a switched mode power supply for providing a grid voltage, which is higher than the anode voltage. The output of the high voltage transformer is coupled to the transformer of the switched mode power supply, for adding the output voltage of the switched mode power supply to the high voltage of the high voltage transformer. Preferably, the transformer of the switched mode power supply provides the high voltage isolation, and at least the high voltage part of the module including the transformer is potted with a resin. The high voltage module provides advantageously also an output for a connection to the anode of the picture tube, so that the module can be used with present high voltage transformers, without requiring any modification.

Abstract: In a configuration equipped with an anode current detecting resistor connected between a ground side terminal of secondary coils wound around a flyback transformer and generating a high voltage for an anode of a CRT, it is equipped with declination detecting device which detects declination of a voltage of the ground side terminal, and control device which stops an operation of a horizontal output transistor, after a state is shifted from a power OFF state to a power ON state, when the declination detecting device 5 does not detect declination of a voltage of the ground side terminal in case that a predetermined period has passed.

Abstract: The high voltage supply for a picture tube (T) comprises a high voltage transformer (DST), which generates the anode voltage of the picture tube, and a high voltage module (M) with a switched mode power supply for providing a grid voltage, which is higher than the anode voltage. The output of the high voltage transformer (DST) is coupled to the transformer (TR) of the switched mode power supply, for adding the output voltage of the switched mode power supply to the high voltage of the high voltage transformer. Preferably, the transformer (TR) of the switched mode power supply provides the high voltage isolation, and at least the high voltage part of the module (M) including the transformer is potted with a resin. The high voltage module provides advantageously also an output (3) for a connection to the anode of the picture tube, so that the module can be used with present high voltage transformers, without requiring any modification.

Abstract: An apparatus for generating a dynamic focus signal appropriate for a flat-type CDT, or flat-screen CRT has a first multiplier for receiving a horizontal sawtooth wave and outputting the square component of the wave; a second multiplier for receiving a vertical sawtooth wave and outputting the square component of the wave; a third multiplier for multiplying the outputs of the first and the second multipliers; and a mixer for mixing the outputs of the first through the third multipliers and outputting the result as a dynamic focus signal. The apparatus is able to perform optimal focus control appropriate for a flat-screen CRT.

Abstract: An electromagnetic quadrupole circuit capable of always performing the optimal correction of the spot form is provided with: a current detecting means 20 for detecting the peak value and bottom value of current flowing along an electromagnetic quadrupole coil 8; a control means 50 for supplying a prescribed peak control value and a prescribed bottom control value; a first power source 16 for controlling the feedback of the amount of supply current based on the peak value detected by the current detecting means 20 and the peak control value supplied from the control means 50; and a second power source 17 for controlling the feedback of the amount of supply current based on the bottom value detected by the current detecting means 20 and the bottom control value supplied from the control means 50.

Abstract: A horizontal-deflection correction circuit may be constructed with a horizontal deflection stage for deflecting a scan electronic beam in a horizontal direction by a sawtooth current flowing in horizontal deflection coil; a control stage for outputting a first and second control voltages which have the same value in case of performing a linear correction and for outputting the first and second control voltages which have different values in case of performing a S-shaped correction; a first correction stage for varying an inductance of a first variable inductor connected in series to the horizontal deflection coil according to the first control voltage and for correcting a magnitude and a direction of the sawtooth current; and a second correction stage for varying an inductance of the second variable inductor connected in series to the first variable inductor in an opposite polarity and for correcting the magnitude and the direction of the sawtooth current.

Abstract: Openings 2C01 and 2C03, which are formed by dividing pins 531 and 5033, are formed on a side section 2C of a horizontal deflection coil 2 within a range of 20 to 35% of a length of the horizontal deflection coil 2 from a larger diameter flange 2B and within an angle of 10 to 25 degrees to an X-axis. Other openings 2C02 and 2C04, which are formed by dividing pins 5032 and 5034, are formed on the side section 2C of the horizontal deflection coil 2 within a range of 55 to 70% of a length of the horizontal deflection coil 2 from the larger diameter flange 2B and within an angle of 25 to 40 degrees to the X-axis.

Abstract: Disclosed is a circuit for adjusting a horizontal center of a raster displayed on a monitor CRT, which includes a current generating circuit which can control an amount of a direct current flowing through a horizontal deflection yoke of the monitor based on a control voltage, a first voltage, and a second voltage. A control part generates the control voltage in response to a center adjustment signal. A voltage generating circuit generates the first and second voltages, respectively. The first voltage has a higher potential than that of a B.sup.+ voltage which is applied to the horizontal deflection yoke, and the second voltage has a lower potential than that of the B.sup.+ voltage. The current generating circuit either generates a first current flowing into the horizontal deflection yoke to increase the direct current or a second current flowing out therefrom to decrease the direct current, such that the horizontal center of the raster is controlled.

Abstract: The invention relates to a dynamic focusing circuit with an output (1) for supplying a dynamic focusing voltage (Vf) to a focus electrode of a cathode ray tube (CRT). The dynamic focusing voltage (Vf) has, in succession, a falling edge, an almost flat part and a rising edge. A first transistor (T1) has a main current path (c1, e1) coupled between a supply voltage (V+) and the output (1). An arrangement of a secondary winding (Ls) of a transformer (T) and a current determining circuit (12) is coupled between the control input (b1) of the first transistor (T1) and the output (1). The current determining circuit (12) supplies a bias current (Ib). A second transistor (T2) has a control electrode (b2) for receiving an input voltage (Vi) related to a parabolically shaped input waveform (Vin), and a main terminal (c2) coupled to the control input (b1) of the first transistor to withdraw current (Id) from the control input (b1).

Abstract: A top/bottom pincushion correction amplifier has an inhibit terminal that is coupled to vertical deflection means for receiving an inhibit pulse that corresponds to a vertical retrace pulse in the yoke. A vertical amplifier feeds the yoke in series with the secondary winding of a pincushion transformer, the primary winding of which is supplied with a pincushion correction signal from the pincushion amplifier. The effect of the retrace pulse in the yoke in causing ringing in the pincushion transformer is nullified by the inhibit pulse which increases the output impedance of the pincushion amplifier.

Abstract: A switched mode power supply transformer, particularly for a television receiver, including a primary winding and a secondary winding with the primary winding and the secondary winding each being subdivided into a plurality of respective partial windings. The partial windings of the primary lie in a first group of chambers and the partial windings of the secondary lie in a second group of chambers of a chamber coil body, and the chambers of both groups are nested or interleaved with one another.

Abstract: A primary winding of a power transformer is coupled to a source of DC voltage. First and second controllable switches are coupled to the primary winding in a push-pull arrangement. A control circuit responsive to a deflection rate input signal that is synchronized with deflection circuit scanning applies a turn-off switching signal alternately to the two controllable switches during each deflection cycle. In response to the turnoff of each one of the two controllable switches, a turn-on switching signal is applied to the other switch to develop a deflection rate alternating polarity output voltage across an output winding of the power transformer. The output voltage is rectified and applied to a deflection generator to thereby energize the generator into developing scanning current in a deflection winding.

Abstract: A program card comprised of passive elements is collocated or otherwise considered part of the cathode ray tube, CRT, module of a modularized display unit, and is used to dictate major system operating parameters to a set of cooperating electronic modules. This concept allows an appropriate standard set of electronic modules to drive CRTs of differing deflection angles, screen and neck sizes. Sparing cost and logistic complexity can be reduced at field installations which utilize CRT displays of various sizes.

Abstract: Each orthogonal driver channel for the magnet deflection yoke of a conventional CRT includes a simple bifilar wound transformer which is connected so that the deflection current waveform passes therethrough. The transformer effectively minimizes the inherent parasitic capacitance between the two windings of the magnetic deflection yoke as it affects a high frequency input signal presented to the input terminal of the high gain operational amplifier. However, the impedance introduced within the feedback loop of the operational amplifier is minimal with respect to an input signal to either driver channel, and thus no significant distortion is presented to the current waveform driving each winding.

Abstract: A high voltage generating circuit for a television receiver which includes a horizontal oscillator and a switching circuit operating at the horizontal sweep frequency of the television receiver and being coupled to a flyback transformer which has an input resonant frequency in the vicinity of but higher than the horizontal oscillator frequency. The output of the flyback transformer is coupled to a rectifier circuit which in turn is coupled to the high voltage anode of the television receiver. The flyback transformer also has an input resonant circuit which includes a capacitor which is serially connected to the primary winding of the flyback transformer. This series resonant circuit is resonant at a frequency in the vicinity but less than the frequency of the horizontal oscillator with the result that improved voltage regulation is obtained while avoiding excess high voltage which otherwise would be caused by a shift in the output frequency of the horizontal oscillator.