JPS5558647A - Coordinate signal generation circuit system - Google Patents

Abstract

PURPOSE: To reduce the number of coordinate signal lines, etc., to simplify a circuit by storing the y coordinate value from an equalizer into one register by a clock pulse and transferring the x coordinate value, which was stored by the preceding clock pulse, to the other register.

CONSTITUTION: Receiving input signals are demodulated by multiplying cos ωct and sin ωct and become x and y coordiante value signals. Then, higher components are eliminated by LPF 1 and 2, and waveforme distortion is eliminated by equalizer 11, and after that, the transmission signal point is decided by decision circuit 12. In this case, x coordinate value x₁ is temporarily stored in register 13 by a clock pulse from clock generator 14, and y coordinate value y₁ from equalizer 11 is stored in register 13 by the next clock pulse, and simultaneously, coordinate value x₁ is transferred to register 15. Then, digital values stored in registers 13 and 15 are converted to analogue values by D/A converters 16 and 17 and are displayed on oscilloscope 10. As a result, the number of coordinate signal lines, etc., can be reduced to simplyfy the circuit.

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