摘要:
A method for generating display correction waveforms for a CRT display comprises the steps of selecting one of a plurality of trace portions for forming part of a correction waveform, the trace portions having different average values. Completing each of the correction waveform by combining each selected trace portion with a respective retrace portion such that all completed correction waveforms have a predetermined average value. The correction waveforms may have vertical and/or horizontal rates.
摘要:
A method for generating display correction waveforms (Fm) for a CRT display comprises the steps of selecting one of a plurality of trace portions (Dpar) for forming part of a correction waveform (Vpar), the trace portions having different average values. Completing each of the correction waveform by combining each selected trace portion (Dpar) with a respective retrace portion (Dcomp) such that all completed correction waveforms (Vpar) have a predetermined average value.
摘要:
Circuit dit modulateur à diodes, constitué d'un interrupteur (TR) en parallèle avec deux diodes (D1, D2) en cascade dans le sens inverse, auquel est relié un bobinage déviateur (LD) en série avec une première capacité de S (CS1) et un enroulement de transformateur (TR). Une seconde capacité de S (CS2) en série avec un thyristor (TH) est connectée d'un côté à la première capacité de S, et de l'autre côté au point commun (PMED) des deux diodes du modulateur, et le déclenchement correct du thyristor est obtenu en isolant sa cathode par rapport au dit point commun (PMED) au moyen d'une diode (D4) et en plaçant un pont diviseur de trois résistances (R1, R2, R3) entre le dit point commun (PMED) et la masse, l'espace gâchette-cathode étant connecté aux bornes d'une des résistances (R2). Application : entre autres, au réglage de la largeur d'image ("effet panorama")
摘要:
A compact and low cost HDTV receiver capable of reproducing both an NTSC signal and an HDTV signal having a horizontal deflection frequency about twice that of the NTSC signal is provided by improving a construction and arrangement of a double speed NTSC signal processing portion of the receiver. A pair of velocity modulation coils 13a and a pair of auxiliary vertical deflection coils 13b are provided on a common bobbin as such that the coil pairs are arranged orthogonally to each other.
摘要:
A television receiver is controlled as to the degree of vertical zoom via a deflection current ramp that varies in slope and which may be delayed to achieve panning. Due to the increased slope when zoomed, the deflection current and the electron beam complete a trace in less time than the normal vertical interval. The deflection current is maintained at one extreme or the other outside the trace interval, and the beam is blanked. A retrace signal generator (10a, C17, U07) coupled in a feedback (IERROR) loop with the power supply for the deflection circuit determines the midpoint of the blanking period and generates a fast retrace (VRESET) at or near the midpoint. The feedback loop is arranged to minimize the DC average current in the deflection winding by having a current source responsive to the DC average current for charging a timing ramp (C17) that triggers retrace upon reaching a threshold. The slope of the timing ramp varies with DC loading, thus advancing or retarding retrace to center retrace in the blanking interval.