| 摘要 |
PURPOSE:To prevent the omission of a signal in the signal of large level from generating, and to increase a noise eliminating effect at an edge part, by providing a non-linear circuit which compresses a signal level to a non-linear shape when the signal level outputted from a differential circuit is large, corresponding to the signal level. CONSTITUTION:The titled device is constituted so that a non-linear circuit 16 which outputs a signal almost in proportion to the signal level when it is small, but compresses the signal level to the nonlinear shape corresponding to the level when the signal is large, is provided between a differential circuit 13 which takes out a change part per prescribed time in an input signal, and a feedback loop consisting of a delay circuit 17, a multiplier 18, and an adder circuit 19. In this case, a factor P to compress the signal of the non-linear circuit 16 keeps a constant value B when the signal level in the high pass component of the signal inputted to the non-linear circuit 16, is small, and the signal in proportion to an input signal level is outputted. But at the time of inputting the signal of large level to the non-linear circuit 16, the signal is outputted after limiting the amplitude of the signal, therefore, no distortion is generated in the signal.
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