| 摘要 |
PURPOSE: A discriminator is provided to generate a multi-level signal with less restrictions. CONSTITUTION: A multi-level signal discriminator(D1) comprises a wave-shaping circuit(3), a detector(4), a reference level generator(5), a threshold generator(6), comparators(82 to 84), and a control signal generator(10). The wave-shaping circuit(3) shapes the waveform of one branched multi-level signal(MS) according to a control signal(CS) from the control signal generator(10) so that the detector(4) that follows the wave-shaping circuit(3) can correctly detect a first reference level(RL1). The detector(4) detects the first reference level(RL1) from an output signal(OS3) from the wave-shaping circuit(3). The reference level generator(5) generates a second reference level(RL2) of the multi-level signal(MS). The threshold generator(6) generates thresholds(Th1,Th2,Th3) as much as required according to the first and second reference levels(RL1,RL2). The comparators(82 to 84) compares the amplitude of the other branched multi-level signal(MS) with the thresholds(Th1,Th2,Th3). The control signal generator(10) generates a control signal(CS) according to the comparison results from the comparators(82 to 84). Thereby, the transmitting side generates a multi-level signal with less restrictions.
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