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Vertical deflection signal precorrection circuit for a display tube and television receiver comprising such a circuit
Vertical deflection signal precorrection circuit for a display tube and television receiver comprising such a circuit
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机译:用于显示管的垂直偏转信号预校正电路和包括该电路的电视接收机
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摘要
1. Precorrection circuit of the vertical sweeping signal of a visualization tube, the sweeping being piloted by an oscillator (1) supplying a saw-tooth signal (Vb ), this precorrection circuit being characterized in that it comprises : - a switch on polarity reversal circuit (6) that receives on its input terminal the saw-tooth signal (Vb ) and returns on its exit terminal a triangular signal (Ie ), obtained by polarity reversal of a fraction of the saw-tooth, with respect to a reference voltage (Vref ) comprised between the two peak voltages of the saw-tooth ; - an electronic circuit (5) that receives on its input terminal the saw-tooth signal (Vb ) issuing from the oscillator (1) and on its control terminal the triangular signal (Ie ) issuing from the polarity reversal circuit (6), this electronic circuit delivering on its output terminals two saw-tooth currents (I1 and I2 ), in the same direction and of the same period as the input saw-tooth signal (Vb ), one of the currents being affected by an S correction in one direction and the other current being affected by the same correction but in the opposite direction ; - a subtracting circuit (7) that receives on its two input terminals the two currents (I1 and I2 ) issuing from the electronic circuit (5) and returning on its input terminal the precorrection signal (VS ), by elimination of the saw-tooth component.
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