Patent ES-8602317-A1 (ES)
Title: Trilevel sandcastle pulse encoder.
IPC: H03K5/00
Filed: 1984-12-07
Abstract: A first train (rb) of monolevel pulses with timing suitable for retrace blanking purposes and a second train (bg) of monolevel pulses with 'back porch' timing appropriate for burst gating purposes are applied to a circuit serving to generate at a first time interval (P) a train of bilevel pulses exhibiting a first voltage level during periods of overlapping of the pulses of the trains. A second, lesser voltage level is exhibited during the remaining, non-overlapping portions of the pulses of the first train. - A resistor (30) interconnects the first terminal with a second one (J). A keyed voltage source (33) responds to a third train (a) of monolevel pulses timed to indicate recurring kinescope bias control intervals. It develops a third level voltage, intermediate of the first and second levels, at the second terminal during the recurring control intervals. EPAB- EP-147981 B A first train (rb) of monolevel pulses with timing suitable for retrace blanking purposes and a second train (bg) of monolevel pulses with 'backporch' timing appropriate for burst gating purposes are applied to a circuit serving to generate at a first time interval (P) a train of bilevel pulses exhibiting a first voltage level during periods of overlapping of the pulses of the trains. A second, lesser voltage level is exhibited during the remaining, non-overlapping portions of the pulses of the first train. - A resistor (30) interconnects the first terminal with a second one (J). A keyed voltage source (33) responds to a third train (a) of monolevel pulses timed to indicate recurring kinescope bias control intervals. It develops a third level voltage, intermediate of the first and second levels, at the second terminal during the recurring control intervals. (25pp Dwg.No.1/3) - EP-147981 B Pulse encoding apparatus including: a source of a first train (rb) of recurring monolevel pulses a source of a second train (bg) of recurring monolevel pulses, each of the pulses, of said second train overlapping in time a portion of a pulse of said first train a source (34) of a third train (a) of recurring monolevel pulses timed to coincide with periodically recurring control intervals means (20,22), coupled to said source of said first train of pulses and to said source of said second train of pulses, for developing at a first terminal (P) a train of bilevel pulses exhibiting a first voltage (VBG) level during periods of overlapping of said pulses of said pulses of said first and second trains, and exhibiting a second, lesser voltage level (VRB) during the remaining, non-overlapping portions of the pulses of said first train characterised in that, for providing a trilevel sandcastle pulse, said encoding apparatus further includes a resistor (30) interconnecting said first terminal and a second terminal (J) and keyed means (33), coupled to said source (34) of said third train of pulses, for developing a voltage (VAK) of a third level, intermediate said first and second voltage levels, at said second terminal (J) during said recurring control intervals said keyed means exhibiting, during said control intervals, an output impedance significantly lower than the impedance exhibited by said resistor said keyed means being effectively disabled during the periods intervening between successive ones of said control intervals and exhibiting, during said intervening periods, an output impedance significantly higher than the impedance exhibited by said resistor. (13pp) - EP-147981 B A first train (rb) of monolevel pulses with timing suitable for retrace blanking purposes and a second train (bg) of monolevel pulses with 'back porch' timing appropriate for burst gating purposes are applied to a circuit serving to generate at a first time interval (P) a train of bilevel pulses exhibiting a first voltage level during periods of overlapping of the pulses of the trains. A second, lesser voltage level is exhibited during the remaining, non-overlapping portions of the pulses of the first train. - A resistor (30) interconnects the first terminal with a second one (J). A keyed voltage source (33) responds to a third train (a) of monolevel pulses timed to indicate recurring kinescope bias control intervals. It develops a third level voltage, intermediate of the first and second levels, at the second terminal during the recurring control intervals. (Dwg.1/3) USAB- US4558355 A In a colour TV receiver incorporating automatic kinescope bias (AKB) control circuits, a first train of monolevel pulses with timing suitable for retrace blanking purposes and a second train of monolevel pulses with backporch timing appropriate for burst gating purposes are applied to a circuit serving to generate at a first terminal a train of bilevel pulses exhibiting a first voltage level during periods of overlapping of the pulses of the first and second trains, and exhibiting a second, lesser voltage level during the remaining, non-overlapping portions of the pulses of the first train. A resistor interconnects the first terminal with the second terminal. - A keyed voltage source, responsive to a third train of monolevel pulses timed to indicate recurring kinescope bias control intervals, develops a voltage of a third level, intermediate the first and second voltage levels, at the second terminal during the recurring control intervals. The keyed voltage source exhibits, during the control intervals, an output impedance significantly lower than the impedance exhibited by the interconnecting register. During periods intervening successive ones of the control intervals, the voltage source is effectively disabled and exhibits an output impedance significantly higher than the impedance exhibited by the resistor. (10pp)h