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公开(公告)号：ZA818821B
公开(公告)日：1982-11-24
申请号：ZA818821
申请日：1981-12-21
Applicant: RCA CORP
Inventor： WILLIS D
Abstract: A television system for developing a regulated B + scan supply voltage includes a deflection generator (40) with a deflection winding (41); a transformer (22) having a primary winding (22a) coupled to a source (21) of unregulated alternating input voltage for developing across secondary windings (22c, d) an alternating voltage that tends to vary with variations of the unregulated voltage; means (27, 28) responsive to the secondary winding alternating voltage for developing a B + scan supply voltage; and means (32, 39) for applying the B + scan supply voltage to the deflection generator (40) to develop scanning current in the deflection winding. A saturable core (137) with a load coil (37) wound on it is conductively coupled to and magnetically isolated from the transformer secondary windings (22c, d). The load coil (37) is responsive to, and provides regulation of, the transformer secondary winding alternating voltage for developing the regulated B + scan supply voltage.
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公开(公告)号：NZ178521A
公开(公告)日：1978-04-03
申请号：NZ17852175
申请日：1975-08-29
Applicant: RCA CORP
Inventor： WILLIS D
Abstract: An amplifier for driving a color image reproducing device includes a first transistor the base of which is capacitively coupled to a source of color difference signals. The emitter of the first transistor is direct current coupled to the base of a second transistor. The collector of the second transistor is direct current coupled to the base of the first transistor. The emitter of the second transistor is coupled to a source of a predetermined voltage. The emitter of the first transistor is direct current coupled to the emitter of a third transistor of opposite conductivity type which serves as a luminance signal amplifier. The first and third transistors form a matrix amplifier operative to generate a color signal at the collector of the first transistor. The capacitive coupling device and the second transistor form a clamping circuit for maintaining the voltage developed at the emitter of the first transistor substantially independent of direct current conditions of the source of color difference signals and base-to-emitter voltage variations of the first transistor.
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Patent Agency Ranking
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公开(公告)号：SE320100B
公开(公告)日：1970-02-02
申请号：SE662266
申请日：1966-05-13
Applicant: RCA CORP
Inventor： WILLIS D
Abstract: 1,136,028. Colour television. RADIO CORPORATION OF AMERICA. 6 May, 1966 [14 May, 1965], No. 20302/66. Heading H4F. The luminance signal channel in a colour television receiver comprises video detector 13, amplifier stages 46, 58 and delay line 52 to equalize the delay in chrominance circuits, the circuit which connects the detector to stage 46 being arranged so that for D.C. and low video frequencies the stage functions as a cathodefollower (thereby providing a suitable driving impedance for the delay line), whilst for high video frequencies the stage functions as a bootstrap circuit to provide increased gain and peaking of the high frequencies. The detector load comprises capacitor 40 and resistor 84 shunted (on the far side of peaking coil 34) by series resistor chain 36, 38, 39. At D.C. or low frequencies the signal across resistors 36 and 38 is applied between control grid 46c and earth to produce cathode follower operation. At high frequencies the signal across resistors 36, 38 and 39 is applied between control grid 46c and the cathode 46b by way of capacitor 82 to produce boot-strap operation. The A.C. output from delay line 52 is applied to control grid 58c of stage 58 via capacitor 64 and the D.C. output is applied via elements 60, 62, 66, 68, 69. Potentiometer 68 provides brightness adjustment. Resistor 76 in the cathode circuit of the stage provides contrast adjustment. The output of detector 13 across resistor 38 is applied to an auxiliary amplifier 86. The high frequency luminance signals together with chrominance signals are-also-applied to the amplifier from the cathode of stage 46 via a capacitor 92. Inductor 90 is resonant with the input capacitance of amplifier 18 at a frequency above chrominance carrier frequency. The amplifier supplies chrominance circuits 19, sync. signal separator 20 and A.G.C. supply 25. In modified arrangements, Fig. 2 (not shown), capacitor 82 is replaced by L-section high pass filter circuits. Transistors may replace the discharge tubes.
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公开(公告)号：BE899716A
公开(公告)日：1984-09-17
申请号：BE212978
申请日：1984-05-22
Applicant: RCA CORP
Inventor： WILLIS D
Abstract: Un dispositif dans un système comprenant un canal vidéo pour le traitement d'un signal vidéo contenant une information d'image et un dispositif de visualisation, comprenant un moyen pour limiter automatiquement des courants excessifs des faisceaux conduits par le dispositif de visualisation en réponse à l'information d'image du signal vidéo. Il comprend un moyen (30, 31, 32) couplé au canal vidéo et au dispositif de visualisation pour surveiller la conduction de courant de ce dernier pendant des intervalles prescrits.
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